JPH06285454A - Treatment of concrete waste material - Google Patents
Treatment of concrete waste materialInfo
- Publication number
- JPH06285454A JPH06285454A JP9514093A JP9514093A JPH06285454A JP H06285454 A JPH06285454 A JP H06285454A JP 9514093 A JP9514093 A JP 9514093A JP 9514093 A JP9514093 A JP 9514093A JP H06285454 A JPH06285454 A JP H06285454A
- Authority
- JP
- Japan
- Prior art keywords
- cement
- waste material
- concrete waste
- recycled
- aggregate
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000002699 waste material Substances 0.000 title claims abstract description 77
- 239000004567 concrete Substances 0.000 title claims abstract description 68
- 239000004568 cement Substances 0.000 claims abstract description 121
- 239000002994 raw material Substances 0.000 claims abstract description 11
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 28
- 239000000203 mixture Substances 0.000 claims description 26
- 239000010440 gypsum Substances 0.000 claims description 24
- 229910052602 gypsum Inorganic materials 0.000 claims description 24
- 238000000034 method Methods 0.000 claims description 24
- 239000000463 material Substances 0.000 claims description 17
- 150000007522 mineralic acids Chemical class 0.000 claims description 13
- 238000007873 sieving Methods 0.000 claims description 11
- 238000003672 processing method Methods 0.000 claims 1
- 239000004570 mortar (masonry) Substances 0.000 abstract description 10
- 239000000126 substance Substances 0.000 abstract description 10
- 239000002253 acid Substances 0.000 abstract description 3
- 230000001172 regenerating effect Effects 0.000 abstract description 3
- 239000011505 plaster Substances 0.000 abstract 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 25
- 239000011398 Portland cement Substances 0.000 description 15
- 239000000843 powder Substances 0.000 description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 13
- 238000004458 analytical method Methods 0.000 description 12
- ZOMBKNNSYQHRCA-UHFFFAOYSA-J calcium sulfate hemihydrate Chemical compound O.[Ca+2].[Ca+2].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O ZOMBKNNSYQHRCA-UHFFFAOYSA-J 0.000 description 12
- 239000004576 sand Substances 0.000 description 11
- 229910004298 SiO 2 Inorganic materials 0.000 description 10
- 239000000243 solution Substances 0.000 description 10
- 239000013078 crystal Substances 0.000 description 9
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 8
- 238000010306 acid treatment Methods 0.000 description 8
- 229910017604 nitric acid Inorganic materials 0.000 description 8
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical compound [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 description 7
- 229910001424 calcium ion Inorganic materials 0.000 description 7
- 159000000007 calcium salts Chemical class 0.000 description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 7
- 239000002245 particle Substances 0.000 description 7
- 239000012266 salt solution Substances 0.000 description 7
- 235000019738 Limestone Nutrition 0.000 description 6
- 239000006028 limestone Substances 0.000 description 6
- 239000007791 liquid phase Substances 0.000 description 6
- 239000000377 silicon dioxide Substances 0.000 description 5
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 4
- 238000002441 X-ray diffraction Methods 0.000 description 4
- 238000005259 measurement Methods 0.000 description 4
- 238000002156 mixing Methods 0.000 description 4
- MUBZPKHOEPUJKR-UHFFFAOYSA-N Oxalic acid Chemical compound OC(=O)C(O)=O MUBZPKHOEPUJKR-UHFFFAOYSA-N 0.000 description 3
- 239000007864 aqueous solution Substances 0.000 description 3
- 239000006227 byproduct Substances 0.000 description 3
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 description 3
- 238000010276 construction Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 150000004683 dihydrates Chemical class 0.000 description 3
- 239000010453 quartz Substances 0.000 description 3
- 238000004064 recycling Methods 0.000 description 3
- 239000004575 stone Substances 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 2
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 2
- 239000003513 alkali Substances 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- 239000010426 asphalt Substances 0.000 description 2
- 210000000988 bone and bone Anatomy 0.000 description 2
- 238000001354 calcination Methods 0.000 description 2
- 239000004927 clay Substances 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 239000000839 emulsion Substances 0.000 description 2
- 238000010304 firing Methods 0.000 description 2
- 238000006703 hydration reaction Methods 0.000 description 2
- 239000004615 ingredient Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000002244 precipitate Substances 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 239000000741 silica gel Substances 0.000 description 2
- 229910002027 silica gel Inorganic materials 0.000 description 2
- 239000000725 suspension Substances 0.000 description 2
- 239000002023 wood Substances 0.000 description 2
- 229910021532 Calcite Inorganic materials 0.000 description 1
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 241001674048 Phthiraptera Species 0.000 description 1
- 244000046146 Pueraria lobata Species 0.000 description 1
- 235000010575 Pueraria lobata Nutrition 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 239000001110 calcium chloride Substances 0.000 description 1
- 229910001628 calcium chloride Inorganic materials 0.000 description 1
- 238000005119 centrifugation Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000010908 decantation Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000000706 filtrate Substances 0.000 description 1
- 239000010881 fly ash Substances 0.000 description 1
- 230000002431 foraging effect Effects 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 235000006408 oxalic acid Nutrition 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 150000003467 sulfuric acid derivatives Chemical class 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Landscapes
- Processing Of Solid Wastes (AREA)
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、コンクリート廃材の処
理方法に関し、特にコンクリート廃材から再生セメント
を生成すると同時に、コンクリート廃材に含まれる骨材
を回収する方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for treating concrete waste material, and more particularly to a method for producing recycled cement from concrete waste material and at the same time collecting aggregate contained in the concrete waste material.
【０００２】[0002]
【従来の技術】近年、道路や橋梁、上下水道、住宅等の
社会資本の整備や、ビルや工場等の高層化や大型化に伴
い、その建設土木工事に付随して発生する建設廃材は膨
大な量となっており、今後益々増加することが予想され
ている。特に、建設廃材のうち発生量が多いコンクリー
ト廃材に関しては、その一部が路盤やアスファルト舗装
等の床材、あるいは山間部や海岸部の埋め立て用材料と
して再利用されているものの、大部分はそのまま廃棄さ
れているのが現状である。しかし、廃棄処理地の不足や
遠隔化、あるいはその管理等、廃材の処理に関する諸問
題が発生し、環境汚染とも関連して大きな社会問題とな
っている。2. Description of the Related Art In recent years, with the improvement of social capital such as roads, bridges, water and sewage systems, housing, etc., as well as the rise and increase in size of buildings and factories, the amount of construction waste that accompanies civil engineering works is enormous. However, it is expected that it will increase more and more in the future. In particular, of the construction waste materials, which are generated in large quantities, some of them are reused as floor materials for roadbeds, asphalt pavements, etc., or landfill materials in mountainous areas and coastal areas, but most of them remain as they are. Currently, it is abandoned. However, various problems related to the disposal of waste materials such as shortage of waste disposal sites, remoteization, or management thereof have become a major social problem in connection with environmental pollution.
【０００３】一方、コンクリート用の良質な天然資材の
枯渇化に伴い、代替骨材として山砂や海砂の使用が増加
する傾向にあるが、鉄骨の腐食やコンクリートのひび割
れ等のアルカリ骨材反応の原因になっている。このよう
に環境保護や省資源の面から、コンクリート廃材を有効
に再利用する方法が望まれており、これまでにも各種の
方法が提案されている。On the other hand, with the depletion of high-quality natural materials for concrete, the use of mountain sand or sea sand as an alternative aggregate tends to increase, but alkali aggregate reactions such as corrosion of steel frames and cracking of concrete occur. Is causing Thus, from the viewpoint of environmental protection and resource saving, a method for effectively reusing concrete waste material is desired, and various methods have been proposed so far.
【０００４】例えば、特開昭５３−１２６０２８号公報
には、コンクリート廃材を粉砕して角を落とし、水洗乾
燥後に樹脂系乳剤で表面処理したものを、セメント、砂
と混合して石材に加工する再生方法が開示されている。
また、特開昭５８−６９７７２号公報には、コンクリー
ト廃材の破砕物を製砂機にかけて、粒度別に分級して廃
材表面に付着しているセメント成分を機械的に除去して
再生骨材を生成する方法が開示されている。For example, in Japanese Patent Laid-Open No. 53-126028, a concrete waste material is crushed to remove corners, washed with water and dried, and then surface-treated with a resin emulsion, which is mixed with cement and sand to be processed into a stone material. A reproduction method is disclosed.
Further, in Japanese Unexamined Patent Publication No. 58-69772, a crushed material of concrete waste material is subjected to a sand making machine to classify it according to particle size and mechanically remove cement components adhering to the surface of the waste material to produce recycled aggregate. A method of doing so is disclosed.
【０００５】[0005]
【発明が解決しようとする課題】一般にコンクリート廃
材を破砕しただけではその表面にモルタル付着物が多く
残存する。その結果、廃材破砕物の吸水率が高くなり、
これをそのまま用いてコンクリートとした場合には、コ
ンクリートの機械的強度が低下するという問題がある。Generally, crushing a concrete waste material leaves a large amount of mortar deposits on its surface. As a result, the water absorption rate of the crushed waste material is high,
When this is used as it is for concrete, there is a problem that the mechanical strength of the concrete is lowered.
【０００６】そこで、前記特開昭５８−６９７７２号公
報では、分級作業によりコンクリート廃材破砕物の表面
から付着物を剥離して骨材だけを回収しているが、比較
的大粒径のセメント成分を剥離することは比較的容易で
あるものの、微細なセメント成分を剥離するには何段階
にもわたる分級作業や長時間振動摩耗を与える必要があ
るため、生産性や経済性に問題がある。また、前記特開
昭５３−１２６０２８号公報では、表面処理により水和
反応を抑制しているが、角落としや水洗乾燥等の工程処
理に手間がかかるうえに、樹脂系乳剤を使用するためコ
スト増となる。Therefore, in the above-mentioned Japanese Patent Laid-Open No. 58-69772, only the aggregate is recovered by separating the adhering material from the surface of the crushed concrete waste material by the classification work, but the cement component having a relatively large particle size is used. Although it is relatively easy to peel off, it is necessary to carry out classification work and vibration wear for a long period of time in order to peel off the fine cement component, so there is a problem in productivity and economical efficiency. Further, in the above-mentioned Japanese Patent Laid-Open No. 53-126028, the hydration reaction is suppressed by surface treatment, but it takes time and labor for process treatment such as corner removal, washing with water and drying, and the cost is high because a resin emulsion is used. Will increase.
【０００７】また、既述したようにコンクリート廃材
は、一部が路盤やアスファルト舗装等の床材として再利
用されているものの、その大部分は山間部や海岸部の埋
め立て用材料として利用されているだけであり、その利
用範囲も狭く、付加価値も高いものではない。そのた
め、コンクリート廃材を無駄なく再生して再利用するこ
とにより、その付加価値を高める必要がある。Further, as mentioned above, although some of the concrete waste materials are reused as floor materials for roadbeds and asphalt pavements, most of them are used as landfill materials in mountainous areas and coastal areas. However, its range of use is narrow and its added value is not high. Therefore, it is necessary to increase the added value by recycling and reusing the waste concrete material without waste.
【０００８】しかし、従来の方法では、コンクリート廃
材から分離した骨材のうち、比較的大粒径の骨材は有効
に回収、再生されているが、廃材破砕時あるいは骨材再
生時に同時に発生する微細骨材やセメント成分の再生方
法に関しては、あまり検討されていない。本発明は、こ
れら諸問題を解決することを目的とし、コンクリート廃
材のセメント成分と骨材成分との分離を完全に行うとと
もに、従来はあまり検討されていなかった微細骨材成分
及びセメント成分についても有効に再生して、コンクリ
ート廃材を無駄なく利用することによりコスト面での改
善を図ると同時に、その付加価値を高めるものである。However, in the conventional method, among the aggregates separated from the concrete waste material, the aggregate material having a relatively large particle size is effectively recovered and regenerated, but it is generated at the same time when the waste material is crushed or the aggregate material is regenerated. The method of regenerating fine aggregate and cement components has not been studied so much. The present invention aims to solve these problems, complete separation of the cement component and aggregate component of the concrete waste material, the fine aggregate component and the cement component has not been studied so far By effectively recycling and using waste concrete material without waste, the cost is improved and the added value is increased.
【０００９】[0009]
【課題を解決するための手段】本発明者らは、コンクリ
ート廃材の再生に関する前記課題を解決すべく鋭意研究
を重ねた結果、廃材破砕物を骨材成分とセメント成分と
に分離して、セメント成分は組成調整を行って新たなセ
メント原料に転化するとともに、骨材成分に関しては、
無機酸処理により骨材表面を浄化して骨材として回収す
ると同時に、酸溶解部分を石膏に転化することにより、
コンクリート廃材を無駄なく有効に再利用できることを
見出し、本発明を完成するに至った。Means for Solving the Problems As a result of intensive studies to solve the above-mentioned problems relating to the recycling of concrete waste materials, the present inventors have separated crushed waste materials into an aggregate component and a cement component, and Ingredients are converted into new cement raw materials by adjusting the composition, and as for aggregate ingredients,
By purifying the aggregate surface by inorganic acid treatment and collecting it as aggregate, by converting the acid-dissolved portion into gypsum,
The inventors have found that concrete waste can be effectively reused without waste, and have completed the present invention.
【００１０】即ち、前記課題は、（１）コンクリート廃
材から再生セメントを生成するコンクリート廃材の処理
方法において、コンクリート廃材を粉砕して篩分けを行
い、篩下部分の組成をセメント原料の組成に調整し、組
成調整後、焼成して再生セメントクリンカーとし、再生
セメントクリンカーに石膏を添加して再生セメントを生
成する各工程から構成されること、（２）コンクリート
廃材から再生骨材を回収するコンクリート廃材の処理方
法において、コンクリート廃材を粉砕して篩分けを行
い、篩上部分を回収し、これを無機酸処理し、酸不溶部
分を再生骨材として回収する各工程から構成されるこ
と、（３）コンクリート廃材から再生セメント及び再生
骨材を生成するコンクリート廃材の処理方法において、
コンクリート廃材を粉砕して篩分けを行い、篩下部分及
び篩上部分をそれぞれ回収し、篩下部分の組成をセメン
ト原料の組成に調整した後、焼成して再生セメントクリ
ンカーとし、再生セメントクリンカーに石膏を添加して
再生セメントを生成するとともに、篩上部分を無機酸処
理し、酸不溶部分を再生骨材として回収する各工程から
構成されること、（４）無機酸処理にあたり、溶解成分
を硫酸処理して石膏を合成すること、（５）コンクリー
ト廃材から再生セメント及び再生骨材を生成するコンク
リート廃材の処理方法において、コンクリート廃材を粗
粉砕して篩分けを行い、篩上部分を粗骨材として回収
し、篩下部分を再粉砕して微細化して再び篩分けを行
い、篩上部分を細骨材として、また篩下部分をセメント
水和物として回収し、回収セメント水和物の組成をセメ
ント原料の組成に調整した後、焼成して再生セメントク
リンカーとし、再生セメントクリンカーに石膏を添加し
て再生セメントを生成するとともに、回収された粗骨材
及び細骨材を無機酸処理を行い、酸不溶成分を再生骨材
として回収し、溶解成分を硫酸処理して石膏を合成する
各工程から構成されることを特徴とするコンクリート廃
材の処理方法により解決することができる。That is, the above-mentioned problems are (1) In a method for treating a concrete waste material for producing recycled cement from a concrete waste material, the concrete waste material is crushed and sieved, and the composition of the lower sieve portion is adjusted to the composition of the cement raw material. Then, after the composition is adjusted, it is fired to produce a recycled cement clinker, and each step is performed by adding gypsum to the recycled cement clinker to produce recycled cement, and (2) a concrete waste material for recovering recycled aggregate from concrete waste material. In the treatment method of 1, the concrete waste material is crushed and sieved, the sieve upper portion is recovered, the inorganic acid treatment is carried out, and the acid-insoluble portion is recovered as recycled aggregate. ) In a method for treating a concrete waste material for producing a recycled cement and a recycled aggregate from the concrete waste material,
Concrete waste material is crushed and sieved, the under-sieving part and the over-sieving part are respectively recovered, and the composition of the under-sieving part is adjusted to the composition of the cement raw material, and then fired to obtain a recycled cement clinker, which is used as a recycled cement clinker. It is composed of each step of adding gypsum to produce recycled cement, treating the sieve part with inorganic acid, and recovering the acid-insoluble part as recycled aggregate. (5) In a method for treating a concrete waste material that produces recycled cement and recycled aggregate from a waste concrete material, the waste concrete material is roughly crushed and sieved, and the upper portion of the sieve is coarse bone. Recovered as a wood material, re-pulverized the under-sieve portion to be finely divided, and sieved again, the upper-sieve portion as fine aggregate and the under-sieve portion as cement hydrate, After adjusting the composition of the hydrated cement hydrate to the composition of the cement raw material, it is fired to give a recycled cement clinker, and gypsum is added to the recycled cement clinker to produce recycled cement, and the recovered coarse aggregate and fine bone are collected. A method of treating concrete waste material, which comprises treating each material with an inorganic acid, recovering acid-insoluble components as recycled aggregate, and treating dissolved components with sulfuric acid to synthesize gypsum. You can
【００１１】以下に、本発明に係るコンクリート廃材の
処理方法を構成する前記各工程に関して、図１のフロー
シートを参照して詳細に説明する。先ず、回収コンクリ
ート廃材を公知の粉砕機により粗破砕し、適当な目開き
の標準篩を用いて篩分けを行う。篩上部分は、その表面
にセメント水和物が付着した大粒径の粗骨材である。The respective steps constituting the concrete waste material treating method according to the present invention will be described below in detail with reference to the flow sheet of FIG. First, the recovered concrete waste material is roughly crushed by a known crusher and sieved using a standard sieve having an appropriate opening. The upper part of the sieve is a coarse aggregate having a large particle size and cement hydrate attached to the surface thereof.
【００１２】次いで、篩下部分を更に微細に破砕して、
より目開きの小さな篩を用いて篩分けを行う。篩上部分
は、細骨材として回収される。上記篩分けにより分離さ
れた篩上部分は、骨材として回収されて後述される酸処
理工程に送られる。一方、篩下部分は、セメント水和物
からなる微粉末であり、この微粉末中には前記篩分けで
分離されなかった細骨材であるケイ砂がかなりの量混入
しているため、初期のセメント組成に比べてＣａＯ／Ｓ
ｉＯ2 モル比が低下している。Next, the under-sieve portion is further finely crushed,
Sieve using a sieve with a smaller opening. The sieve portion is collected as fine aggregate. The upper portion of the sieve separated by the above-mentioned sieving is collected as aggregate and sent to the acid treatment step described later. On the other hand, the part under the sieve is a fine powder made of cement hydrate, and since a considerable amount of silica sand, which is a fine aggregate not separated by the sieving, is mixed in the fine powder, CaO / S compared to other cement compositions
The iO 2 molar ratio is decreasing.
【００１３】そこで、石灰石粉末等の石灰質成分を添加
してＣａＯ／ＳｉＯ2 モル比の調整を行い、次いでこの
モル比調整済みセメント水和物微粉末を、１０００〜１
４５０℃、好ましくは１３５０℃〜１４５０℃の高温で
１〜４時間焼成して、再生セメントクリンカーを生成す
る。なお、コンクリート廃材の種類によっては、ＣａＯ
分が多く含有されている場合がある。この場合は、石灰
石の代わりに粘土、ケイ石、ケイ砂等のケイ酸質成分を
添加してＣａＯ／ＳｉＯ2 モル比の調整を行う。Therefore, a calcareous component such as limestone powder is added to adjust the CaO / SiO 2 molar ratio, and then the cement hydrate fine powder whose molar ratio has been adjusted is 1000 to 1
The regenerated cement clinker is produced by calcining at a high temperature of 450 ° C, preferably 1350 ° C to 1450 ° C for 1 to 4 hours. Depending on the type of concrete waste material, CaO
May contain a large amount of minutes. In this case, instead of limestone, a siliceous component such as clay, silica stone, and silica sand is added to adjust the CaO / SiO 2 molar ratio.
【００１４】ここで、ＣａＯ／ＳｉＯ2 モル比の最適値
は、セメント水和物の組成や廃材の材令（経時年数）に
よって異なるが、２．０〜５．０の範囲、好ましくは
２．３〜３．０の範囲、更に好ましくは２．７〜２．８
の範囲に設定されることが望ましい。ＣａＯ量が多くな
ると水和熱や硬化体の膨張が大きくなり、逆にモル比が
小さくなるとセメント組成がＣ2 Ｓ側にシフトして石英
成分が多く晶析し、いずれの場合もコンクリートの機械
的強度を低下させる要因となる。The optimum value of the CaO / SiO 2 molar ratio depends on the composition of the cement hydrate and the age (age) of the waste material, but is in the range of 2.0 to 5.0, preferably 2. 3 to 3.0, more preferably 2.7 to 2.8.
It is desirable to set in the range of. When the amount of CaO increases, the heat of hydration and expansion of the hardened product increase, and conversely, when the molar ratio decreases, the cement composition shifts to the C 2 S side and a large amount of quartz component crystallizes. It becomes a factor to lower the dynamic strength.
【００１５】また必要に応じて粘土、スラグ、フライア
ッシュ、銅ガラミやＡｌ（ＯＨ）3やＦｅ（ＯＨ）3 等
のアルミナ質成分や鉄質成分を添加してＡｌ2 Ｏ3 やＦ
ｅ2Ｏ3 等他のセメント成分の組成調整を行い、ＣａＯ
／（ＳｉＯ2 ＋Ａｌ2 Ｏ3 ＋Ｆｅ2 Ｏ3 ）モル比として
２．０〜５．０、好ましくは２．２〜３．０の範囲に設
定して、１０００〜１４５０℃、好ましくは１２５０℃
〜１４００℃の高温で１〜４時間焼成して、再生セメン
トクリンカーを生成してもよい。If necessary, clay, slag, fly ash, copper lice, and alumina (Al) (OH) 3 and Fe (OH) 3 and iron-based components may be added to add Al 2 O 3 and F.
Adjusting the composition of other cement components such as e 2 O 3 and CaO
/ (SiO 2 + Al 2 O 3 + Fe 2 O 3 ) molar ratio is set to 2.0 to 5.0, preferably to 2.2 to 3.0, 1000 to 1450 ° C., preferably 1250 ° C.
Regenerated cement clinker may be produced by calcination at elevated temperatures of ~ 1400 ° C for 1-4 hours.
【００１６】尚、組成調整にあたり、篩下部分から回収
されるセメント水和物を予め水洗処理して硫酸塩やアル
カリ類等の可溶成分を溶解分離した後、前述の組成調整
を行い焼成することにより好適な再生セメントクリンカ
ーとすることも可能である。このようにして得られた再
生セメントクリンカーに、凝結調整剤として重量比で数
％程度、例えば１〜５重量％の二水石膏を添加した後、
ボールミル等により粉砕して再生セメントを生成する。
この時の再生セメントクリンカーの粉砕状態は、ブレー
ン値２７００ｃｍ2 ／ｇ以上、３５００ｃｍ2 ／ｇ程度
が好ましい。In adjusting the composition, the cement hydrate recovered from the lower part of the sieve is washed with water in advance to dissolve and separate soluble components such as sulfates and alkalis, and then the composition is adjusted and fired. Therefore, it is also possible to make a suitable recycled cement clinker. To the regenerated cement clinker thus obtained, after adding a few% by weight, for example 1 to 5% by weight, of gypsum dihydrate as a setting regulator,
Grind with a ball mill or the like to produce recycled cement.
At this time, the crushed state of the recycled cement clinker is preferably a Blaine value of 2700 cm 2 / g or more and about 3500 cm 2 / g.
【００１７】また、前記篩分け工程において回収された
粗骨材及び細骨材は、その表面にかなりの量のセメント
水和物が付着しており、これを機械的に分離するのはか
なり困難である。そこで、これら骨材を無機酸、例えば
濃度０．１〜２．０Ｎ、好ましくは０．３〜０．７Ｎの
硝酸水溶液中に分散させ、所定時間攪拌する。この酸処
理により、骨材表面に付着していたセメント水和物は溶
液中に溶解し、骨材は表面が清浄化されて、容器底部に
沈降する。この溶液をデカンテーションして沈降してい
る骨材を回収し、水洗して酸を洗い落とすことにより、
コンクリート生成用として良好な骨材が得られる。Further, the coarse aggregate and fine aggregate recovered in the sieving step have a considerable amount of cement hydrate adhered to the surface thereof, and it is considerably difficult to mechanically separate them. Is. Therefore, these aggregates are dispersed in an inorganic acid, for example, a nitric acid aqueous solution having a concentration of 0.1 to 2.0 N, preferably 0.3 to 0.7 N, and stirred for a predetermined time. By this acid treatment, the cement hydrate adhering to the surface of the aggregate is dissolved in the solution, the surface of the aggregate is cleaned, and the aggregate is settled on the bottom of the container. The solution is decanted to collect the sedimented aggregate, which is washed with water to remove the acid,
A good aggregate can be obtained for concrete production.
【００１８】この酸処理に使用される無機酸は、前記硝
酸の他にも硫酸や塩酸、燐酸、シュウ酸、クエン酸等を
使用できる。中でも硝酸や硫酸、塩酸が、骨材表面に付
着しているセメント成分の溶解性や経済性の面で好まし
い。但し、硫酸を用いて骨材表面に付着したセメント水
和物を溶解すると、ただちに二水石膏が生成して、後述
される液相浮遊物と混合して分離が困難になるため、硝
酸や塩酸がより好ましい。As the inorganic acid used for this acid treatment, sulfuric acid, hydrochloric acid, phosphoric acid, oxalic acid, citric acid or the like can be used in addition to the nitric acid. Of these, nitric acid, sulfuric acid, and hydrochloric acid are preferable from the viewpoint of solubility and economic efficiency of cement components adhering to the aggregate surface. However, when the cement hydrate adhering to the aggregate surface is dissolved using sulfuric acid, dihydrate gypsum is immediately formed, and it becomes difficult to separate it by mixing it with the liquid phase suspended matter described later. Is more preferable.
【００１９】また、これら無機酸と処理骨材の量は、使
用する無機酸の種類やその濃度により異なるが、例えば
０．５Ｎ硝酸の場合には、骨材（ｇ）／硝酸水溶液（リ
ットル）比で、１／５程度が好ましい。一方、液相部分
には微細なシリカゲルやその他の固形物が浮遊してお
り、遠心分離によりこれら浮遊物を除去する。残りの溶
液は、カルシウム塩溶解液であり、これに硝酸を添加し
てカルシウムイオン濃度として０．１〜０．３モル／リ
ットル、好ましくは０．１５モル／リットルとなるよう
に濃度調整を行った後、８０℃〜１００℃程度に加熱し
て、硫酸を前記カルシウム塩溶解液中のカルシウムイオ
ンと当量になるように添加すると、石膏が生成して沈殿
する。沈殿物を所定時間熟成させた後、濾過して石膏を
回収する。尚、濾液は精製されて酸処理工程で再利用さ
れる。The amounts of the inorganic acid and the treated aggregate vary depending on the type of inorganic acid used and the concentration thereof. For example, in the case of 0.5N nitric acid, the aggregate (g) / nitric acid aqueous solution (liter) is used. The ratio is preferably about 1/5. On the other hand, fine silica gel and other solid substances are suspended in the liquid phase portion, and these suspended substances are removed by centrifugation. The remaining solution is a calcium salt solution, and nitric acid is added to this solution to adjust the concentration so that the calcium ion concentration is 0.1 to 0.3 mol / liter, preferably 0.15 mol / liter. After that, when heated to about 80 ° C. to 100 ° C. and adding sulfuric acid in an amount equivalent to the calcium ions in the calcium salt solution, gypsum is formed and precipitated. The precipitate is aged for a predetermined time and then filtered to collect gypsum. The filtrate is purified and reused in the acid treatment step.
【００２０】生成する石膏は、合成時のカルシウム塩溶
液の組成や硫酸濃度により結晶構造が異なり、カルシウ
ム塩溶液中のカルシウムイオン濃度と当量の硫酸溶液を
添加した場合にはα型半水石膏が生成し、カルシウムイ
オン濃度に対して当量以上の硫酸溶液を添加するとβ型
半水石膏が生成する。また、カルシウム塩溶液が炭酸カ
ルシウム懸濁液の場合には硫酸を添加するとβ型半水石
膏が生成し、カルシウム塩溶液が塩化カルシウム懸濁液
の場合には硫酸を添加することによりα型半水石膏が生
成する。The gypsum produced has a different crystal structure depending on the composition of the calcium salt solution at the time of synthesis and the sulfuric acid concentration. When the sulfuric acid solution is added in an amount equivalent to the calcium ion concentration in the calcium salt solution, α-type hemihydrate gypsum is produced. When β-hemihydrate gypsum is produced and a sulfuric acid solution in an amount equal to or higher than the calcium ion concentration is added, β-hemihydrate gypsum is produced. When the calcium salt solution is a calcium carbonate suspension, addition of sulfuric acid produces β-type hemihydrate gypsum, and when the calcium salt solution is a calcium chloride suspension, addition of sulfuric acid produces an α-type semi-hydrate. Water gypsum is produced.
【００２１】このように、カルシウム塩溶液の組成や硫
酸濃度を選択することにより、所望の石膏を得ることが
できる。また、生成石膏の結晶形状は、α型半水石膏は
長径１４００μｍ、短径２０μｍ（アスペクト比７０）
程度の大型針状結晶であり、β型半水石膏は長径３５０
μｍ、短径７μｍ（アスペクト比５０）程度の針状結晶
である。尚、通常の焼き石膏はβ型半水石膏の微細針状
結晶であるが、本発明による得られるα型半水石膏は、
結晶性の高い大型結晶であり、混水量は少なくてすみ、
焼き石膏の５〜１０倍程度の強度が発現する。As described above, desired gypsum can be obtained by selecting the composition of the calcium salt solution and the sulfuric acid concentration. The crystal shape of the generated gypsum is α-type hemihydrate gypsum with a major axis of 1400 μm and a minor axis of 20 μm (aspect ratio 70).
It is a large needle-shaped crystal with a size of β-type hemihydrate gypsum with a major axis of 350.
It is a needle-shaped crystal with a diameter of 7 μm and a minor axis of 7 μm (aspect ratio 50). Incidentally, the usual calcined gypsum is fine needle-shaped crystals of β-type hemihydrate gypsum, α-type hemihydrate gypsum obtained by the present invention,
It is a large crystal with high crystallinity, and the amount of mixed water is small,
The strength is about 5 to 10 times that of calcined gypsum.
【００２２】以上説明したように、本発明に係る上記工
程により、コンクリート廃材から骨材成分及びセメント
成分を回収するとともに、新たに石膏を副生することが
できるため、コンクリート廃材の有効利用に加えて、そ
の付加価値を高めることができる。As explained above, since the aggregate component and the cement component can be recovered from the concrete waste material and the gypsum can be newly produced as a by-product by the above-mentioned steps according to the present invention, in addition to the effective utilization of the concrete waste material. The added value can be increased.
【００２３】[0023]
【実施例】本発明に係るコンクリート廃材の処理方法に
関して、実施例を基により詳細に説明する。但し、本発
明は以下に記載される実施例に限定されずに、種々の変
更が可能である。 〔実施例１〕日本大学理工学部駿河台校舎２号館の５２
年経過建築物の改修工事現場から採集したコンクリート
廃材１０ｋｇを、ハンマークラッシャーにて破砕し、１
６メッシュ標準篩を用いて、粒径１ｍｍ以上の粗骨材を
分離した。回収粗骨材は、廃材全量に対して１２．９重
量％であった。篩下部分を、さらにハンマークラッシャ
ーにて細破砕し、１２０メッシュ標準篩を用いて、粒径
８８μｍ以上の細骨材を分離した。回収細骨材は、廃材
全量に対して６７．０重量％であった。EXAMPLES The method for treating concrete waste material according to the present invention will be described in detail based on examples. However, the present invention is not limited to the examples described below, and various modifications can be made. [Example 1] 52, Surugadai Building 2, Nihon University College of Science and Engineering
10 kg of concrete waste materials collected from the site of construction repair work for a year are crushed with a hammer crusher, and 1
A 6-mesh standard sieve was used to separate coarse aggregate having a particle size of 1 mm or more. The amount of recovered coarse aggregate was 12.9% by weight based on the total amount of waste material. The portion under the sieve was further crushed with a hammer crusher, and fine aggregate having a particle diameter of 88 μm or more was separated using a 120 mesh standard sieve. The recovered fine aggregate was 67.0% by weight based on the total amount of the waste material.
【００２４】これら回収骨材のうち粒径８８μｍから１
ｍｍの細骨材１００ｇを採集して、０．５Ｎ硝酸（関東
化学（株）製）水溶液５００ｍｌ中に入れ、１０分間攪
拌した後、デカンテーションにより骨材と液相とに分離
した。この酸処理の結果、骨材表面に付着していたセメ
ント水和物は、完全に表面から分離しており、これを水
洗して酸を洗い落として骨材８０ｇを得た。再生骨材の
表面状態を、トプコン社ＡＬＰＨＡ−５０走査型電子顕
微鏡で観察したところ、セメント成分の付着もなく、角
部が取れた平滑な表面であった。[0024] Of these recovered aggregates, particle sizes from 88 μm to 1
100 g of mm fine aggregate was put into 500 ml of 0.5N nitric acid (manufactured by Kanto Chemical Co., Inc.) aqueous solution, stirred for 10 minutes, and then separated into aggregate and liquid phase by decantation. As a result of this acid treatment, the cement hydrate adhering to the surface of the aggregate was completely separated from the surface, and this was washed with water to wash off the acid to obtain 80 g of aggregate. When the surface condition of the regenerated aggregate was observed with an ALPHA-50 scanning electron microscope manufactured by Topcon, it was a smooth surface with no corners and no adhesion of cement components.
【００２５】また、液相部分を遠心分離機にかけて、シ
リカゲルやその他の浮遊物を分離した。分離後の溶液に
は１リットル当たり０．２５モルのカルシウムイオンが
溶解しており、これを０．１５モル／リットルのカルシ
ウムイオン濃度となるように１３．５Ｎ硝酸（純度６１
％）（関東化学（株）製）溶液を１１ｍｌ添加して濃度
調整を行った後、１００℃に加熱して、３６Ｎ硫酸（純
度９６％）（関東化学（株）製）溶液をカルシウムイオ
ン濃度と当量となるように１４ｍｌ添加した。生成沈殿
物を、３０分間保持して熟成させた後、濾過してα型半
水石膏３５ｇを得た。得られたα型半水石膏を、トプコ
ン社ＡＬＰＨＡ−５０走査型電子顕微鏡により観測した
ところ、長径が１４００μｍで短径が２０μｍ（アスペ
クト比７０）程度の大型針状結晶であった。Further, the liquid phase portion was subjected to a centrifugal separator to separate silica gel and other suspended matters. In the solution after separation, 0.25 mol of calcium ion was dissolved per liter, and this solution was mixed with 13.5 N nitric acid (purity: 61%) so that the concentration of calcium ion was 0.15 mol / l.
%) (Manufactured by Kanto Kagaku Co., Ltd.) to adjust the concentration, and then heated to 100 ° C. to make 36N sulfuric acid (purity 96%) (manufactured by Kanto Kagaku Co.) solution a calcium ion concentration. 14 ml was added so that the equivalent amount was obtained. The produced precipitate was kept for 30 minutes for aging and then filtered to obtain 35 g of α-type hemihydrate gypsum. When the obtained α-type hemihydrate gypsum was observed with an ALPHA-50 scanning electron microscope manufactured by Topcon, it was found to be large needle-like crystals having a major axis of 1400 μm and a minor axis of about 20 μm (aspect ratio 70).
【００２６】一方、前記篩分けにより分離された篩下部
分（セメント水和物）を、ＪＩＳＲ５２０２に準拠して
化学分析を行った。分析結果を、表１に示す。On the other hand, the under-sieve portion (cement hydrate) separated by the above-mentioned sieving was subjected to chemical analysis in accordance with JISR5202. The analysis results are shown in Table 1.
【００２７】[0027]
【表１】 [Table 1]
【００２８】表１から明らかなように、この篩下部分に
は細骨材が一部混入して、ＣａＯ／ＳｉＯ2 モル比が
０．７９程度まで低下しており、Ｘ線解析を行ったとこ
ろ石英のピークが認められた。この篩下部分を１００ｇ
採集して、石灰石粉末（（関東化学（株）製）を１４５
ｇ添加してＣａＯ／ＳｉＯ2 モル比を２．８に調整した
後、１４５０℃で１時間焼成して再生セメントクリンカ
ー１５４ｇを得た。得られた再生セメントクリンカーの
化学分析値（ＪＩＳ Ｒ５２０２準拠）を、表２に示
す。As is clear from Table 1, a fine aggregate was partially mixed in this under-sieve portion, and the CaO / SiO 2 molar ratio had dropped to about 0.79, and an X-ray analysis was conducted. However, a peak of quartz was recognized. 100 g of this undersize
Collect 145 g of limestone powder (manufactured by Kanto Chemical Co., Inc.)
After adding g to adjust the CaO / SiO 2 molar ratio to 2.8, it was fired at 1450 ° C. for 1 hour to obtain 154 g of regenerated cement clinker. Table 2 shows the chemical analysis values (according to JIS R5202) of the obtained recycled cement clinker.
【００２９】[0029]
【表２】 [Table 2]
【００３０】表２には比較のために普通ポルトランドセ
メントの化学分析値を併記するが、同表から、本発明に
よる再生セメントクリンカーは、普通ポルトランドセメ
ントに比べてＣａＯ（遊離ＣａＯを含む）及びＳｉＯ2
の含有量が若干高いものの、略同一の組成であることが
判る。尚、両者のＸ線回折図を比較したところ、略同一
の回折パターンを示した。Table 2 also shows the chemical analysis values of ordinary Portland cement for comparison. From the same table, the regenerated cement clinker according to the present invention has CaO (containing free CaO) and SiO compared to ordinary Portland cement. 2
It can be seen that the compositions are almost the same although the content of is slightly higher. In addition, when comparing the X-ray diffraction patterns of the both, almost the same diffraction pattern was shown.
【００３１】再生セメントクリンカーに二水石膏（半井
化学（株）製）を再生セメントクリンカー全量に対して
３重量％添加し、これをアルミナ製ボールミルを用いて
ブレーン値３５００ｃｍ3 ／ｇにまで粉砕して、再生セ
メントを得た。得られた再生セメントをＪＩＳ Ｒ５２
０１に準拠して凝結及び強度試験を行い、普通ポルトラ
ンドセメントとの比較検討を行った。Gypsum dihydrate (manufactured by Hanai Chemical Co., Ltd.) was added to the recycled cement clinker in an amount of 3% by weight based on the total amount of the recycled cement clinker, and this was ground to a Blaine value of 3500 cm 3 / g using an alumina ball mill. As a result, recycled cement was obtained. The regenerated cement obtained is JIS R52
The setting and strength tests were carried out in accordance with No. 01, and comparative examination with ordinary Portland cement was carried out.
【００３２】標準軟度のペーストを作成するための水／
セメント混合比は、普通ポルトランドセメントが０．２
７であったのに対して、再生セメントは０．２８であっ
た。また凝結時間に関しては、普通ポルトランドセメン
トは、開始時間９０分及び終結時間１５０分であったの
に対して、再生セメントは、開始時間８５分及び終結時
間１５０分であった。尚、両者ともに偽凝結は起こらな
かった。図２に、凝結時間の測定結果を示す。Water / to prepare a standard softness paste
The cement mixing ratio is 0.2 for ordinary Portland cement.
The recycled cement was 0.28, compared to 7. Regarding the setting time, the ordinary Portland cement had a starting time of 90 minutes and a finishing time of 150 minutes, while the regenerated cement had a starting time of 85 minutes and a finishing time of 150 minutes. Neither of them caused false condensation. FIG. 2 shows the measurement result of the setting time.
【００３３】このように、再生セメントは、普通ポルト
ランドセメントと同様の凝結特性を示すことが確認され
た。また、再生セメント及び普通ポルトランドセメント
について、セメント／標準砂重量比０．５及びセメント
／水重量比０．６５の割合で配合してモルタルを作成
し、圧縮強度を測定した。測定結果を、図３に示す。As described above, it was confirmed that the regenerated cement exhibits the setting property similar to that of the ordinary Portland cement. Reclaimed cement and ordinary Portland cement were mixed at a cement / standard sand weight ratio of 0.5 and a cement / water weight ratio of 0.65 to prepare mortar, and the compressive strength was measured. The measurement result is shown in FIG.
【００３４】例えば２８日圧縮強度を比較すると、普通
ポルトランドセメント（図中□）が約３８０ｋｇｆ／ｃ
ｍ2 であるのに対し、再生セメント（図中○）は約６０
ｋｇｆ／ｃｍ2 であり、普通ポルトランドセメントの約
１／６程度であった。そこで、前記セメント水和物微粉
末に、Ａｌ（ＯＨ）3 （関東化学（株）製）及びＦｅ
（ＯＨ）3 （関東化学（株）製）を、各々重量比で１．
１％及び２．０％添加して、ＣａＯ／（ＳｉＯ2 ＋Ａｌ
2 Ｏ3 ＋Ｆｅ2 Ｏ3 ）モル比を２．４７として、普通ポ
ルトランドセメントのモル比（２．４４）に近づけて同
様のモルタルを作成したところ、２８日圧縮強度が約３
７０ｋｇｆ／ｃｍ2 にまで増加した（図中■）。For example, comparing the 28-day compressive strength, ordinary Portland cement (□ in the figure) is about 380 kgf / c.
whereas the m 2, and reproducing the cement (in the figure ○) is about 60
It was kgf / cm 2 , which was about 1/6 that of ordinary Portland cement. Therefore, Al (OH) 3 (manufactured by Kanto Chemical Co., Inc.) and Fe are added to the cement hydrate fine powder.
(OH) 3 (manufactured by Kanto Kagaku Co., Ltd.) in a weight ratio of 1.
1% and 2.0% addition, CaO / (SiO 2 + Al
When a similar mortar was prepared by setting the 2 O 3 + Fe 2 O 3 ) molar ratio to 2.47 and approaching the molar ratio of ordinary Portland cement (2.44), the 28-day compressive strength was about 3
It increased to 70 kgf / cm 2 (■ in the figure).
【００３５】また、再生セメントと普通ポルトランドセ
メントとを同量ずつ混合してモルタルを作成したとこ
ろ、２８日圧縮強度が約２４０ｋｇｆ／ｃｍ2 にまで増
加した（図中●）。 〔実施例２〕普通ポルトランドセメントと豊浦標準砂
（３００μｍ以上１％、１０６μｍ以上９５％）を、セ
メント／標準砂重量比０．５及びセメント／水重量比
０．６５の割合で配合して作成したセメント−ケイ石系
モルタル（材令１年）を、実施例１と同様の処理を行
い、骨材成分とセメント水和物とに分離した。When mortar was prepared by mixing recycled cement and ordinary Portland cement in equal amounts, the 28-day compressive strength increased to about 240 kgf / cm 2 (● in the figure). [Example 2] Ordinary Portland cement and Toyoura standard sand (300 µm or more 1%, 106 µm or more 95%) were compounded at a cement / standard sand weight ratio of 0.5 and a cement / water weight ratio of 0.65. The cement-silica mortar (age 1 year) was treated in the same manner as in Example 1 to separate it into an aggregate component and a cement hydrate.
【００３６】再生骨材の表面状態を実施例１と同様にト
プコン社ＡＬＰＨＡ−５０走査型電子顕微鏡で観察した
ところ、セメント成分の付着もなく、角部が取れた平滑
な表面であった。また、液相部分についても実施例１と
同様の処理を行いα型半水石膏を生成した。得られたα
型半水石膏を、トプコン社ＡＬＰＨＡ−５０走査型電子
顕微鏡により観測したところ、実施例１と同程度の長径
が１４００μｍで短径が２０μｍ（アスペクト比７０）
程度の大型針状結晶であった。When the surface condition of the recycled aggregate was observed with an ALPHA-50 scanning electron microscope manufactured by Topcon Corporation in the same manner as in Example 1, it was found that the cement component did not adhere and the surface was smooth with the corners removed. The liquid phase portion was also treated in the same manner as in Example 1 to produce α-type hemihydrate gypsum. Obtained α
The type hemihydrate gypsum was observed with an ALPHA-50 scanning electron microscope manufactured by Topcon. As a result, the major axis was 1400 μm and the minor axis was 20 μm (aspect ratio 70), which was the same as in Example 1.
It was a large-sized needle-like crystal.
【００３７】一方、セメント水和物に関して、実施例１
と同様の化学分析を行った。分析結果を、表１に併記す
る。実施例１と同様に、細骨材が混入してＣａＯ／Ｓｉ
Ｏ2モル比が０．９５程度まで低下しているのが確認さ
れた。Ｘ線解析を行ったところ、実施例１と同様の石英
のピークが認められた。このセメント水和物微粉末１０
０ｇに、石灰石粉末（関東化学（株）製）を９８ｇ添加
して、ＣａＯ／ＳｉＯ2 モル比を２．７に調整した後、
１４５０℃で１時間焼成して再生セメントクリンカー１
３５ｇを得た。得られた再生セメントクリンカーを、実
施例１と同様の化学分析を行った。分析結果を表２に併
記する。On the other hand, regarding cement hydrate, Example 1
The same chemical analysis was performed. The analysis results are also shown in Table 1. Similar to Example 1, CaO / Si mixed with fine aggregate
It was confirmed that the O 2 molar ratio had dropped to about 0.95. When X-ray analysis was performed, the same peak of quartz as in Example 1 was recognized. This cement hydrate fine powder 10
After adding 98 g of limestone powder (manufactured by Kanto Chemical Co., Inc.) to 0 g to adjust the CaO / SiO 2 molar ratio to 2.7,
Reclaimed cement clinker 1 by firing at 1450 ° C for 1 hour
35 g were obtained. The obtained regenerated cement clinker was subjected to the same chemical analysis as in Example 1. The analysis results are also shown in Table 2.
【００３８】再生セメントクリンカーを、実施例１と同
様にして再生セメントを生成し、この再生セメントをも
とにモルタルを作成して同様の強度試験を行った。圧縮
強度の測定結果を、図３に併記する（図中△）。２８日
圧縮強度は、約２５０ｋｇｆ／ｃｍ2 であり、普通ポル
トランドセメントの約２／３程度の強度を示した。 〔実施例３〕普通ポルトランドセメントと栃木県葛生産
石灰石粉末（３００μｍ以上１％、１０６μｍ以上９５
％；ＣａＣＯ3 純度９７．５％、アルカリ分０．１％以
下）を、セメント／標準砂重量比０．５及びセメント／
水重量比０．６５の割合で配合して作成したセメント−
石灰石系モルタル（材令１年）を、実施例１と同様の処
理を行い、骨材成分とセメント水和物とに分離した。Regenerated cement clinker was produced in the same manner as in Example 1, and mortar was prepared from this regenerated cement and the same strength test was conducted. The results of measurement of compressive strength are also shown in FIG. 3 (Δ in the figure). The 28-day compressive strength was about 250 kgf / cm 2 , which was about 2/3 that of ordinary Portland cement. [Example 3] Ordinary Portland cement and limestone powder produced in Kuzu, Tochigi Prefecture (300 µm or more 1%, 106 µm or more 95
%; CaCO 3 purity 97.5%, alkali content 0.1% or less), cement / standard sand weight ratio 0.5 and cement / standard sand
Cement prepared by mixing at a water weight ratio of 0.65
Limestone-based mortar (age 1 year) was treated in the same manner as in Example 1 to separate it into an aggregate component and a cement hydrate.
【００３９】再生骨材の表面状態を実施例１と同様にト
プコン社ＡＬＰＨＡ−５０走査型電子顕微鏡で観察した
ところ、セメント成分の付着もなく、角部が取れた平滑
な表面であった。また、液相部分についても実施例１と
同様の処理を行いα型半水石膏を生成した。得られたα
型半水石膏を、トプコン社ＡＬＰＨＡ−５０走査型電子
顕微鏡により観測したところ、実施例１と同程度の長径
が１４００μｍで短径が２０μｍ（アスペクト比７０）
程度の大型針状結晶であった。When the surface condition of the regenerated aggregate was observed with an ALPHA-50 scanning electron microscope manufactured by Topcon Corporation in the same manner as in Example 1, it was found that the surface was smooth without any cement component adhering. The liquid phase portion was also treated in the same manner as in Example 1 to produce α-type hemihydrate gypsum. Obtained α
The type hemihydrate gypsum was observed with an ALPHA-50 scanning electron microscope manufactured by Topcon. As a result, the major axis was 1400 μm and the minor axis was 20 μm (aspect ratio 70), which was the same as in Example 1.
It was a large-sized needle-like crystal.
【００４０】一方、セメント水和物に関して、実施例１
と同様の化学分析を行った。分析結果を、表１に併記す
る。このセメント水和物は、廃材中の骨材であるＣａＣ
Ｏ3がそのまま混入しているため、ＣａＯ／ＳｉＯ2 モ
ル比が７．５７と非常に高かいことが確認された。Ｘ線
解析を行ったところ、カルサイトのピークが認められ
た。On the other hand, regarding cement hydrate, Example 1
The same chemical analysis was performed. The analysis results are also shown in Table 1. This cement hydrate is CaC which is an aggregate in waste wood.
Since O 3 was mixed in as it was, it was confirmed that the CaO / SiO 2 molar ratio was as high as 7.57. When X-ray analysis was performed, a peak of calcite was observed.
【００４１】このセメント水和物微粉末１００ｇに、ケ
イ石粉末（関東化学（株）製）を１３ｇ添加して、Ｃａ
Ｏ／ＳｉＯ2 モル比を２．７４に調整した後、１４５０
℃で１時間焼成して再生セメントクリンカー７８ｇを得
た。得られた再生セメントクリンカーを、実施例１と同
様の化学分析を行った。分析結果を表２に併記する。再
生セメントクリンカーを、実施例１と同様にして再生セ
メントを生成し、この再生セメントをもとにモルタルを
作成して同様の強度試験を行った。圧縮強度の測定結果
を、図３に併記する（図中▲）。２８日圧縮強度は、約
６０ｋｇｆ／ｃｍ2 であり、実施例１のコンクリート廃
材の場合と同程度であった。そこで、実施例１と同様に
前記セメント水和物微粉末に、Ａｌ（ＯＨ）3 （関東化
学（株）製）、Ｆｅ（ＯＨ）3 （関東化学（株）製）及
び普通ポルトランドセメントを添加して組成調整を行っ
たところ、実施例１と同様の圧縮強度を示した。To 100 g of this cement hydrate fine powder, 13 g of silica stone powder (manufactured by Kanto Chemical Co., Inc.) was added, and Ca was added.
After adjusting the O / SiO 2 molar ratio to 2.74, 1450
Firing at 1 ° C. for 1 hour gave 78 g of regenerated cement clinker. The obtained regenerated cement clinker was subjected to the same chemical analysis as in Example 1. The analysis results are also shown in Table 2. Regenerated cement clinker was produced in the same manner as in Example 1, and mortar was prepared based on this regenerated cement and the same strength test was conducted. The results of measurement of compressive strength are also shown in FIG. 3 (▲ in the figure). The 28-day compressive strength was about 60 kgf / cm 2 , which was similar to that of the concrete waste material of Example 1. Therefore, Al (OH) 3 (manufactured by Kanto Chemical Co., Inc.), Fe (OH) 3 (manufactured by Kanto Chemical Co., Ltd.) and ordinary Portland cement are added to the cement hydrate fine powder as in Example 1. Then, the composition was adjusted, and the same compressive strength as that of Example 1 was exhibited.
【００４２】[0042]
【発明の効果】以上説明したとおり、本発明に係るコン
クリート廃材の処理方法は、コンクリート廃材を骨材成
分とセメント成分とに篩分けした後、篩下部分の微粉末
については組成調整を行ってセメント原料に再生すると
ともに、骨材成分については無機酸による酸処理を施し
て、骨材表面に付着しているセメント成分を溶解して、
表面が清浄な骨材を得るとともに、溶解したセメント成
分を含む溶液からは石膏を副生するものであるから、コ
ンクリート廃材を無駄無く再生できるだけでなく、石膏
を副生できるため付加価値を高めることができる。As described above, in the method for treating concrete waste material according to the present invention, the concrete waste material is sieved into the aggregate component and the cement component, and then the composition of the fine powder in the undersize is adjusted. While regenerating into a cement raw material, the aggregate component is subjected to acid treatment with an inorganic acid to dissolve the cement component adhering to the aggregate surface,
In addition to obtaining aggregate with a clean surface, gypsum is produced as a by-product from the solution containing dissolved cement components, so not only can waste concrete be recycled without waste, but gypsum can also be produced as a by-product to increase added value. You can
【００４３】また、再生される骨材やセメントの品質も
良好で、再生骨材は表面が清浄化されているため、従来
問題となっていた付着セメントによるコンクリート強度
の低下を回避することができ、一方再生セメントについ
ても、コンクリートにした場合に市販セメントを使用し
た場合と大差ない機械的強度が得られる。Since the quality of the recycled aggregate and cement is good and the surface of the recycled aggregate is cleaned, it is possible to avoid the decrease in concrete strength due to the adhered cement, which has been a problem in the past. On the other hand, with regard to recycled cement, the mechanical strength of the concrete is not much different from the case of using the commercially available cement.
【図１】 本発明に係るコンクリート廃材の処理方法の
フローシートを示す図である。FIG. 1 is a diagram showing a flow sheet of a method for treating a concrete waste material according to the present invention.
【図２】 再生セメントの凝結特性を説明するための図
である。FIG. 2 is a diagram for explaining setting characteristics of recycled cement.
【図３】 再生セメントの強度を説明するための図であ
る。FIG. 3 is a diagram for explaining the strength of recycled cement.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 荒井 康夫 東京都国立市中３−１−７ (72)発明者 安江 任 東京都杉並区大宮１−19−18 (72)発明者 小嶋 芳行 埼玉県蕨市塚越３−23−２ ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yasuo Arai 3-1-7 National City, Tokyo (72) Inventor Yasue Ren 1-19-18 Omiya, Suginami-ku, Tokyo (72) Inventor Yoshiyuki Kojima Saitama Prefecture 3-23-2 Tsukoshi, Warabi-shi
Claims (5)
成するコンクリート廃材の処理方法において、 （１）コンクリート廃材を粉砕して篩分けを行い、 （２）篩下部分の組成をセメント原料の組成に調整し、 （３）組成調整後、焼成して再生セメントクリンカーと
し、 （４）前記再生セメントクリンカーに石膏を添加して再
生セメントを生成する各工程から構成されることを特徴
とするコンクリート廃材の処理方法。1. A method for treating a concrete waste material for producing recycled cement from a concrete waste material, comprising: (1) crushing the concrete waste material for sieving; and (2) adjusting the composition of the under-sieve to the composition of the cement raw material. (3) After the composition is adjusted, it is fired to obtain a recycled cement clinker, and (4) a method for treating a concrete waste material, which comprises each step of adding gypsum to the recycled cement clinker to produce a recycled cement. .
るコンクリート廃材の処理方法において、 （１）コンクリート廃材を粉砕して篩分けを行い、篩上
部分を回収し、 （２）これを無機酸処理し、酸不溶部分を再生骨材とし
て回収する、各工程から構成されることを特徴とするコ
ンクリート廃材の処理方法。2. A method for treating a concrete waste material for recovering recycled aggregate from a concrete waste material, comprising: (1) crushing and sieving the concrete waste material, collecting the upper sieve portion, and (2) treating this with an inorganic acid. Then, the acid-insoluble portion is recovered as recycled aggregate, and the method comprises the steps of treating concrete waste material.
再生骨材を生成するコンクリート廃材の処理方法におい
て、 （１）コンクリート廃材を粉砕して篩分けを行い、篩下
部分及び篩上部分をそれぞれ回収し、 （２）篩下部分の組成をセメント原料の組成に調整した
後、焼成して再生セメントクリンカーとし、 （３）前記再生セメントクリンカーに石膏を添加して再
生セメントを生成するとともに、 （４）篩上部分を無機酸処理し、酸不溶部分を再生骨材
として回収する、各工程から構成されることを特徴とす
るコンクリート廃材の処理方法。3. A method for treating a concrete waste material for producing a recycled cement and a recycled aggregate from a concrete waste material, comprising: (1) crushing and sieving the concrete waste material, and recovering a lower sieve portion and an upper sieve portion, respectively. (2) After adjusting the composition of the portion under the sieve to the composition of the cement raw material, it is fired to give a recycled cement clinker, (3) gypsum is added to the recycled cement clinker to produce recycled cement, and (4) a sieve A method for treating a concrete waste material, comprising the steps of treating an upper part with an inorganic acid and recovering an acid-insoluble part as a recycled aggregate.
理して石膏を合成することを特徴とする請求項２若しく
は請求項３に記載のコンクリート廃材の処理方法。4. The method for treating a concrete waste material according to claim 2 or 3, wherein in the treatment with an inorganic acid, a dissolved component is treated with sulfuric acid to synthesize gypsum.
再生骨材を生成するコンクリート廃材の処理方法におい
て、 （１）コンクリート廃材を粗粉砕して篩分けを行い、篩
上部分を粗骨材として回収し、 （２）篩下部分を再粉砕して微細化して再び篩分けを行
い、篩上部分を細骨材として、また篩下部分をセメント
水和物として回収し、 （３）前記回収セメント水和物の組成をセメント原料の
組成に調整した後、焼成して再生セメントクリンカーと
し、 （４）前記再生セメントクリンカーに石膏を添加して再
生セメントを生成するとともに、 （５）前記工程（１）及び（２）において回収された粗
骨材及び細骨材を無機酸処理を行い、酸不溶成分を再生
骨材として回収し、溶解成分を硫酸処理して石膏を合成
する、各工程から構成されることを特徴とするコンクリ
ート廃材の処理方法。5. A method for treating a concrete waste material for producing a recycled cement and a recycled aggregate from a concrete waste material, comprising: (1) coarsely crushing the concrete waste material for sieving, and collecting the upper sieve portion as coarse aggregate; (2) The under-sieve portion is re-ground to be finely divided and sieved again, and the upper-sieve portion is recovered as fine aggregate and the under-sieve portion as cement hydrate, and (3) the recovered cement hydrate. After adjusting the composition of the material to the composition of the cement raw material, it is fired to obtain a recycled cement clinker, and (4) gypsum is added to the recycled cement clinker to generate recycled cement, and (5) the step (1) and The coarse aggregate and the fine aggregate recovered in (2) are treated with an inorganic acid to recover the acid-insoluble component as recycled aggregate, and the soluble component is treated with sulfuric acid to synthesize gypsum. This Processing method of concrete waste characterized by.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9514093A JP3290237B2 (en) | 1993-03-31 | 1993-03-31 | Concrete waste treatment method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9514093A JP3290237B2 (en) | 1993-03-31 | 1993-03-31 | Concrete waste treatment method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06285454A true JPH06285454A (en) | 1994-10-11 |
| JP3290237B2 JP3290237B2 (en) | 2002-06-10 |
Family
ID=14129505
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9514093A Expired - Lifetime JP3290237B2 (en) | 1993-03-31 | 1993-03-31 | Concrete waste treatment method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3290237B2 (en) |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2741615A1 (en) * | 1995-11-29 | 1997-05-30 | Commissariat Energie Atomique | Hydraulic binder production |
| WO2010143656A1 (en) * | 2009-06-09 | 2010-12-16 | 株式会社竹中工務店 | Hydraulic cement composition |
| JP2012229984A (en) * | 2011-04-26 | 2012-11-22 | Shimizu Corp | Activated concrete processing method |
| CN103130431A (en) * | 2013-03-06 | 2013-06-05 | 北京新奥混凝土集团有限公司 | Reclaimed active ultrafine powder and preparation method thereof |
| CN107890938A (en) * | 2017-11-22 | 2018-04-10 | 北京都市绿源环保科技有限公司 | A kind of method of building waste recycling |
| CN108246428A (en) * | 2018-01-18 | 2018-07-06 | *** | The sandstone separation method and device of waste concrete |
| CN108855522A (en) * | 2017-11-22 | 2018-11-23 | 北京都市绿源环保科技有限公司 | A kind of building waste recycling and processing device |
| CN109433579A (en) * | 2018-11-12 | 2019-03-08 | 长沙万荣粉体设备科技有限公司 | A kind of fixed-end forces equipment |
| CN109695059A (en) * | 2019-01-24 | 2019-04-30 | 长江师范学院 | A kind of preparation method of crystal whisker of gypsum |
| CN110078391A (en) * | 2019-04-17 | 2019-08-02 | 苏州鑫蔚谷环保产业有限公司 | A kind of building waste, which is milled, disposes recoverying and utilizing method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| EP1886799B1 (en) | 2001-09-03 | 2014-02-26 | Teijin Limited | Transparent electroconductive laminate and transparent touch panel using the same |
-
1993
- 1993-03-31 JP JP9514093A patent/JP3290237B2/en not_active Expired - Lifetime
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2741615A1 (en) * | 1995-11-29 | 1997-05-30 | Commissariat Energie Atomique | Hydraulic binder production |
| WO2010143656A1 (en) * | 2009-06-09 | 2010-12-16 | 株式会社竹中工務店 | Hydraulic cement composition |
| JP2010285302A (en) * | 2009-06-09 | 2010-12-24 | Tokyo Institute Of Technology | Hydraulic cement composition |
| JP2012229984A (en) * | 2011-04-26 | 2012-11-22 | Shimizu Corp | Activated concrete processing method |
| CN103130431A (en) * | 2013-03-06 | 2013-06-05 | 北京新奥混凝土集团有限公司 | Reclaimed active ultrafine powder and preparation method thereof |
| CN107890938A (en) * | 2017-11-22 | 2018-04-10 | 北京都市绿源环保科技有限公司 | A kind of method of building waste recycling |
| CN108855522A (en) * | 2017-11-22 | 2018-11-23 | 北京都市绿源环保科技有限公司 | A kind of building waste recycling and processing device |
| CN108246428A (en) * | 2018-01-18 | 2018-07-06 | *** | The sandstone separation method and device of waste concrete |
| CN109433579A (en) * | 2018-11-12 | 2019-03-08 | 长沙万荣粉体设备科技有限公司 | A kind of fixed-end forces equipment |
| CN109695059A (en) * | 2019-01-24 | 2019-04-30 | 长江师范学院 | A kind of preparation method of crystal whisker of gypsum |
| CN110078391A (en) * | 2019-04-17 | 2019-08-02 | 苏州鑫蔚谷环保产业有限公司 | A kind of building waste, which is milled, disposes recoverying and utilizing method |
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