JPH0952743A - Regenerated aggregate concrete composition - Google Patents
Regenerated aggregate concrete compositionInfo
- Publication number
- JPH0952743A JPH0952743A JP22730695A JP22730695A JPH0952743A JP H0952743 A JPH0952743 A JP H0952743A JP 22730695 A JP22730695 A JP 22730695A JP 22730695 A JP22730695 A JP 22730695A JP H0952743 A JPH0952743 A JP H0952743A
- Authority
- JP
- Japan
- Prior art keywords
- concrete
- aggregate
- weight
- recycled
- cement
- 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.)
- Pending
Links
- 239000004567 concrete Substances 0.000 title claims abstract description 76
- 239000000203 mixture Substances 0.000 title claims description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 39
- 239000004568 cement Substances 0.000 claims abstract description 24
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 21
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims abstract description 16
- 125000000217 alkyl group Chemical group 0.000 claims abstract description 8
- 125000002947 alkylene group Chemical group 0.000 claims description 17
- 125000004432 carbon atom Chemical group C* 0.000 claims description 15
- -1 alcohol compound Chemical class 0.000 claims description 14
- 238000010521 absorption reaction Methods 0.000 claims description 12
- DKGAVHZHDRPRBM-UHFFFAOYSA-N Tert-Butanol Chemical compound CC(C)(C)O DKGAVHZHDRPRBM-UHFFFAOYSA-N 0.000 claims description 6
- 125000000753 cycloalkyl group Chemical group 0.000 claims description 3
- 238000001035 drying Methods 0.000 abstract description 8
- 238000001723 curing Methods 0.000 description 16
- 238000000034 method Methods 0.000 description 15
- 230000000052 comparative effect Effects 0.000 description 10
- 239000002699 waste material Substances 0.000 description 10
- 239000011398 Portland cement Substances 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
- 238000004898 kneading Methods 0.000 description 6
- 239000002245 particle Substances 0.000 description 6
- 125000000999 tert-butyl group Chemical group [H]C([H])([H])C(*)(C([H])([H])[H])C([H])([H])[H] 0.000 description 6
- 238000010276 construction Methods 0.000 description 5
- 230000005484 gravity Effects 0.000 description 5
- 239000004570 mortar (masonry) Substances 0.000 description 5
- 125000004108 n-butyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])C([H])([H])* 0.000 description 5
- 239000002994 raw material Substances 0.000 description 5
- 238000012360 testing method Methods 0.000 description 5
- 125000000959 isobutyl group Chemical group [H]C([H])([H])C([H])(C([H])([H])[H])C([H])([H])* 0.000 description 4
- 238000002156 mixing Methods 0.000 description 4
- 238000010998 test method Methods 0.000 description 4
- 238000010306 acid treatment Methods 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 150000007522 mineralic acids Chemical class 0.000 description 3
- 238000007873 sieving Methods 0.000 description 3
- 239000004575 stone Substances 0.000 description 3
- 238000012644 addition polymerization Methods 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 125000000816 ethylene group Chemical group [H]C([H])([*:1])C([H])([H])[*:2] 0.000 description 2
- 125000004491 isohexyl group Chemical group C(CCC(C)C)* 0.000 description 2
- 125000001972 isopentyl group Chemical group [H]C([H])([H])C([H])(C([H])([H])[H])C([H])([H])C([H])([H])* 0.000 description 2
- 125000001280 n-hexyl group Chemical group C(CCCCC)* 0.000 description 2
- 125000000740 n-pentyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])* 0.000 description 2
- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- 125000001973 tert-pentyl group Chemical group [H]C([H])([H])C([H])([H])C(*)(C([H])([H])[H])C([H])([H])[H] 0.000 description 2
- IAYPIBMASNFSPL-UHFFFAOYSA-N Ethylene oxide Chemical compound C1CO1 IAYPIBMASNFSPL-UHFFFAOYSA-N 0.000 description 1
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 1
- 239000002202 Polyethylene glycol Substances 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 238000007605 air drying Methods 0.000 description 1
- 239000011400 blast furnace cement Substances 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000003623 enhancer Substances 0.000 description 1
- 239000010881 fly ash Substances 0.000 description 1
- 125000004051 hexyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])* 0.000 description 1
- 239000011396 hydraulic cement Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 229920001223 polyethylene glycol Polymers 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 230000001603 reducing effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000029058 respiratory gaseous exchange Effects 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
-
- 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
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、土木、建設分野に
おけるコンクリート組成物に関し、特に骨材としてコン
クリート構造物の解体によって得られる再生細骨材およ
び再生粗骨材を用いたコンクリート組成物に関する。TECHNICAL FIELD The present invention relates to a concrete composition in the field of civil engineering and construction, and particularly to a concrete composition using recycled fine aggregate and recycled coarse aggregate obtained by disassembling a concrete structure as an aggregate.
【０００２】[0002]
【従来の技術】近年、道路や橋梁等の社会資本の整備
や、ビル等の構造物の構築に付随して発生する建設廃材
は膨大な量になり、その処分に苦慮している。建設廃材
のうち、特に発生量の多いコンクリート構造物の解体に
よるコンクリート塊の廃材に関しては、有効な利用方法
がなく、これまで路盤材用骨材として再利用されている
ものの、路盤材用骨材だけでは再生利用にも限界が生じ
ている。2. Description of the Related Art In recent years, the amount of construction waste generated in connection with the development of social capital such as roads and bridges and the construction of structures such as buildings has been enormous, and the disposal thereof has been difficult. Among the construction waste materials, there is no effective use method for the waste material of concrete lumps generated by the dismantling of concrete structures, and although it has been reused as aggregate for roadbed materials until now, it is aggregate for roadbed materials. There is a limit to recycling by itself.
【０００３】一方、コンクリート用の良質な天然骨材資
源の枯渇化に伴い、コンクリート廃材をコンクリート用
骨材として再利用することが検討されてきている。しか
し、現状でコンクリート用骨材として一般に使用されて
いるものは、付着モルタル分や付着ペースト分の多い低
品質の再生細骨材や再生粗骨材であり、これらをそのま
ま使用したコンクリートでは、強度が低く、乾燥収縮が
大きいという問題がある。そのため、現状では、再生骨
材を用いたコンクリートは、捨てコンクリートや裏込め
コンクリートといった低強度でも良いコンクリートにし
か使用できなかった。On the other hand, with the depletion of high-quality natural aggregate resources for concrete, it has been considered to reuse the waste concrete material as aggregate for concrete. However, at present, what is generally used as aggregate for concrete is low-quality recycled fine aggregate and recycled coarse aggregate with a large amount of adhered mortar and adhered paste. Is low and the drying shrinkage is large. Therefore, at present, concrete using recycled aggregate can be used only for concrete that has low strength and is good, such as discarded concrete and backfill concrete.
【０００４】そこで、該再生骨材を使用したコンクリー
トの強度を高くする方法として、モルタル分やペースト
分の付着量を少なくした高品質な再生骨材を使用する方
法が知られている（例えば、コンクリート工学年次論文
報告集 Vol.17,No.2 1995）。そして、このような高品
質な再生骨材を製造する方法として、何段階かの粉砕工
程を組み合わせる方法が開示されている。Therefore, as a method of increasing the strength of concrete using the recycled aggregate, there is known a method of using high-quality recycled aggregate having a reduced amount of mortar and paste adhered (for example, Annual Report on Concrete Engineering Vol.17, No.2 1995). Then, as a method of producing such a high-quality recycled aggregate, a method of combining several steps of pulverization processes is disclosed.
【０００５】例えば、特公平７−２９８２１公報には、
コンクリート塊を圧縮によって破砕する第１次破砕工程
と第１次破砕工程から得たコンクリート塊を高密度及び
高圧力下に揉み摺りによって破砕する第２次破砕工程と
さらに第２次破砕工程で得た骨材混合物をふるい分ける
工程からなる再生骨材の製造方法が開示されている。For example, Japanese Patent Publication No. 7-29821 discloses that
Obtained by the first crushing process of crushing concrete lumps by compression and the second crushing process of crushing the concrete lumps obtained from the first crushing process by rubbing under high density and high pressure, and further the second crushing process Disclosed is a method for producing recycled aggregate, which comprises a step of sieving the aggregate mixture.
【０００６】また、高品質な再生骨材を製造する別の方
法として、特開平６ー２８５４５４公報には、コンクリ
ート廃材を粉砕して篩分けを行い、篩上部分および篩下
部分を再粉砕して再び篩分けを行なった篩上部分のそれ
ぞれを無機酸で処理して、酸不溶成分をそれぞれ再生粗
骨材および再生細骨材として回収する方法が開示されて
いる。As another method for producing a high-quality recycled aggregate, Japanese Patent Laid-Open No. 6-285454 discloses that concrete waste material is crushed and sieved, and an upper sieve portion and a lower sieve portion are pulverized again. There is disclosed a method of treating each of the upper sieve portions subjected to sieving again with an inorganic acid to recover the acid-insoluble components as recycled coarse aggregate and recycled fine aggregate, respectively.
【０００７】[0007]
【発明が解決しようとする課題】上記のように、再生骨
材を用いたコンクリートでは、通常のコンクリートに比
べ強度の低下、乾燥収縮の増大といった問題がおこる
が、これらを解決するための前記特公平７−２９８２１
公報のように粉砕工程を組み合わせた再生骨材を製造す
る方法では、再生粗骨材の品質はモルタル分やペースト
分の付着量を少なくできることにより改善されるが、再
生細骨材は、その大部分がコンクリート廃材のモルタル
部分からなるため、その品質の改善が困難であるととも
に、多くの工程やエネルギーを要するのでコストが高く
なり実用的でない。As described above, concrete using recycled aggregate has problems such as a decrease in strength and an increase in drying shrinkage as compared with normal concrete. Fair 7-29821
In the method for producing a recycled aggregate that is combined with a crushing step as in the publication, the quality of recycled coarse aggregate is improved by being able to reduce the amount of mortar and paste adhering. Since the part is composed of the mortar part of the concrete waste material, it is difficult to improve its quality, and since many steps and energy are required, the cost becomes high and it is not practical.
【０００８】また、前記特開平６ー２８５４５４公報の
ように無機酸処理して、酸不溶成分を再生骨材として回
収する方法では、再生骨材の品質は改善されるが、無機
酸処理工程に時間がかかったり、廃酸処理をしなければ
ならないため実用的でない。Further, in the method of recovering the acid-insoluble component as the recycled aggregate by the inorganic acid treatment as in the above-mentioned Japanese Patent Laid-Open No. 6-285454, the quality of the recycled aggregate is improved, but the inorganic acid treatment step It is not practical because it takes time and waste acid treatment is required.
【０００９】一方、アルコール系化合物や低級アルコー
ルのアルキレンオキサイド付加物が乾燥収縮低減剤とし
て知られており、これを添加することが考えられる。ま
た、これと強度増進剤との併用も考えられるが、通常の
コンクリートのような十分な効果は得られず、コスト高
になり用いることができなかった。On the other hand, an alcohol compound or an alkylene oxide adduct of a lower alcohol is known as a dry shrinkage reducing agent, and it may be considered to add this. Further, it is possible to use this together with a strength enhancer, but it was not possible to use it because the sufficient effect like ordinary concrete was not obtained and the cost became high.
【００１０】このため、再生骨材の用途の拡大を図り、
処分に苦慮していたコンクリート廃材の大量処理を図る
ことが望まれていた。本発明は、擁壁や橋梁下部工等の
構造物にも使用できるようなより高い強度と低乾燥収縮
が得られる再生骨材コンクリート組成物を提供すること
を目的とする。Therefore, the use of recycled aggregate is expanded,
It was hoped that a large amount of concrete waste, which had been difficult to dispose of, would be treated. It is an object of the present invention to provide a recycled aggregate concrete composition that can be used for structures such as retaining walls and bridge substructures and that has higher strength and low drying shrinkage.
【００１１】[0011]
【課題を解決するための手段】そこで、本発明者らは、
再生骨材を用いた比較的水/セメント比の高いコンクリ
ートにおける強度改善について鋭意研究した結果、乾燥
収縮低減剤の種類と量、減水剤の量、再生細骨材の種類
（品質）を特定して用いれば、強度の改善が図れ、かつ
低乾燥収縮になり、再生骨材使用時の問題が解決でき
て、コンクリート廃材の有効利用ができるとの知見を
得、本発明に到達した。Means for Solving the Problems Accordingly, the present inventors have:
As a result of diligent research on strength improvement in concrete with a relatively high water / cement ratio using recycled aggregate, the type and amount of drying shrinkage reducing agent, the amount of water reducing agent, and the type (quality) of recycled fine aggregate were specified. The present invention has been completed based on the knowledge that the strength of the recycled aggregate can be improved, the shrinkage due to low drying can be reduced, the problem at the time of using the recycled aggregate can be solved, and the concrete waste can be effectively used.
【００１２】即ち、本発明は、再生骨材を用いた水／セ
メント比が５０重量％以上のコンクリートにおいて、下
記（１）式で示されるアルコール系化合物をセメントの
０．５〜１０重量％、および減水剤をセメントの０．０
５〜５重量％含み、かつ再生細骨材の吸水率が１１重量
％以下である再生骨材を用いたコンクリート組成物であ
る。That is, according to the present invention, in a concrete using recycled aggregate in a water / cement ratio of 50% by weight or more, an alcohol compound represented by the following formula (1) is added in an amount of 0.5 to 10% by weight of the cement, And water reducing agent of cement 0.0
A concrete composition using recycled aggregate containing 5 to 5% by weight and having a water absorption rate of the recycled fine aggregate of 11% by weight or less.
【００１３】 ＲＯＨ （１） （(１)式中、Ｒは炭素数４〜６のアルキル基又は炭素数
５〜６のシクロアルキル基）ROH (1) (wherein R is an alkyl group having 4 to 6 carbon atoms or a cycloalkyl group having 5 to 6 carbon atoms)
【００１４】また、本発明は、（１）式で示されるアル
コール系化合物として、特にｔｅｒｔ−ブチルアルコー
ルを用いることが好ましい態様となる。In the present invention, it is preferable to use tert-butyl alcohol as the alcohol compound represented by the formula (1).
【００１５】さらに、本発明の他の態様として、再生骨
材を用いた水／セメント比が５０重量％以上のコンクリ
ートにおいて、下記（２）式で示される低級アルコール
のアルキレンオキサイド付加物をセメントの０．５〜１
０重量％、および減水剤をセメントの０．０５〜５重量
％含み、かつ再生細骨材の吸水率が１１重量％以下であ
る再生骨材を用いたコンクリート組成物である。Further, as another embodiment of the present invention, in a concrete using recycled aggregate in a water / cement ratio of 50% by weight or more, an alkylene oxide adduct of a lower alcohol represented by the following formula (2) is added to the cement. 0.5-1
A concrete composition using 0% by weight and 0.05 to 5% by weight of cement of a water reducing agent, and a recycled fine aggregate having a water absorption rate of 11% by weight or less.
【００１６】 ＲＯ（ＡＯ）ｎＨ （２） （(２)式中、Ｒは炭素数４〜６のアルキル基、Ａは炭素
数２〜３の１種または２種のアルキレン基、ｎは１〜１
０の整数）RO (AO) nH (2) (In the formula (2), R is an alkyl group having 4 to 6 carbon atoms, A is one or two alkylene groups having 2 to 3 carbon atoms, and n is 1 to 1. 1
An integer of 0)
【００１７】以下、本発明を詳細に説明する。Hereinafter, the present invention will be described in detail.
【００１８】本発明でいう再生骨材とは、コンクリート
構造物を解体したときに生じるコンクリート塊を破砕し
て得られる再生粗骨材と再生細骨材をいう。The term "recycled aggregate" as used in the present invention refers to recycled coarse aggregate and recycled fine aggregate obtained by crushing concrete lumps produced when a concrete structure is dismantled.
【００１９】再生粗骨材は、「ＪＩＳ Ａ ５００５
（コンクリート用砕石） ３．４ 粒度」に示された範囲
に粒度を調整したものである。The recycled coarse aggregate is "JIS A 5005".
(Crushed stone for concrete) The particle size is adjusted within the range shown in "3.4 Particle size".
【００２０】また、再生細骨材は、「ＪＩＳ Ａ ５０
０４（コンクリート用砕砂） ４．４ 粒度」に示された
範囲に粒度を調整したものであり、かつ、本発明におい
ては、「ＪＩＳ Ａ １１０９（細骨材の比重および吸
水率試験方法）」に準じて測定した吸水率が１１重量％
以下のものを用いる。再生細骨材の吸水率が１１重量％
を越えると、再生骨材を用いたコンクリートの強度の改
善が困難となり好ましくない。The recycled fine aggregate is "JIS A 50".
04 (crushed sand for concrete) 4.4 The particle size was adjusted to the range shown in "," and in the present invention, "JIS A 1109 (specific gravity and water absorption test method of fine aggregate)" Water absorption measured according to the following: 11% by weight
Use the following. Water absorption rate of recycled fine aggregate is 11% by weight
If it exceeds, it is difficult to improve the strength of concrete using recycled aggregate, which is not preferable.
【００２１】本発明は、水／セメント比が５０重量％以
上のコンクリートに対して特に有効で、水／セメント比
が５０重量％未満だと強度の改善効果が少ない。The present invention is particularly effective for concrete having a water / cement ratio of 50% by weight or more, and if the water / cement ratio is less than 50% by weight, the strength improving effect is small.
【００２２】本発明の（１）式で示されるアルコール系
化合物において、Ｒは、炭素数４〜６の直鎖または分岐
のアルキル基である。このような基としては、ｎ−ブチ
ル基、ｉｓｏ−ブチル基、ｔｅｒｔ−ブチル基、ｎ−ペ
ンチル基、ｉｓｏ−ペンチル基、ｔｅｒｔ−ペンチル
基、ｎ−ヘキシル基、ｉｓｏ−ヘキシル基、ｔｅｒｔ−
ヘキシル基などが挙げられる。これらのうち好ましいの
はｎ−ブチル基、ｉｓｏ−ブチル基、ｔｅｒｔ−ブチル
基であり、特に好ましいのは、ｔｅｒｔ−ブチル基であ
る。In the alcohol compound represented by the formula (1) of the present invention, R is a linear or branched alkyl group having 4 to 6 carbon atoms. Examples of such groups include n-butyl group, iso-butyl group, tert-butyl group, n-pentyl group, iso-pentyl group, tert-pentyl group, n-hexyl group, iso-hexyl group, tert-butyl group.
Hexyl group and the like. Among these, n-butyl group, iso-butyl group and tert-butyl group are preferable, and tert-butyl group is particularly preferable.
【００２３】また、本発明の（２）式で示される低級ア
ルコールのアルキレンオキサイド付加物において、Ｒ
は、炭素数４〜６の直鎖または分岐のアルキル基であ
る。このような基としては、ｎ−ブチル基、ｉｓｏ−ブ
チル基、ｔｅｒｔ−ブチル基、ｎ−ペンチル基、ｉｓｏ
−ペンチル基、ｔｅｒｔ−ペンチル基、ｎ−ヘキシル
基、ｉｓｏ−ヘキシル基、ｔｅｒｔ−ヘキシル基などが
挙げられる。これらのうち好ましいのはｎ−ブチル基、
ｉｓｏ−ブチル基、ｔｅｒｔ−ブチル基であり、特に好
ましいのは、ｎ−ブチル基である。また、Ａは、炭素数
２〜３のアルキレン基であり、エチレン基および／又は
プロピレン基が挙げられる。エチレン基とプロピレン基
を併用する場合はブロック付加重合でもランダム付加重
合でも差し支えない。ｎは、１〜１０の整数である。ｎ
が、１０を越える場合は強度の改善効果が少ない。Further, in the alkylene oxide adduct of the lower alcohol represented by the formula (2) of the present invention, R is
Is a linear or branched alkyl group having 4 to 6 carbon atoms. Such groups include n-butyl group, iso-butyl group, tert-butyl group, n-pentyl group, iso
-Pentyl group, tert-pentyl group, n-hexyl group, iso-hexyl group, tert-hexyl group and the like can be mentioned. Of these, preferred is an n-butyl group,
An iso-butyl group and a tert-butyl group are preferred, and an n-butyl group is particularly preferred. In addition, A is an alkylene group having 2 to 3 carbon atoms, and examples thereof include an ethylene group and / or a propylene group. When an ethylene group and a propylene group are used in combination, block addition polymerization or random addition polymerization may be used. n is an integer of 1 to 10. n
However, when it exceeds 10, the effect of improving the strength is small.
【００２４】アルコール系化合物又は低級アルコールの
アルキレンオキサイド付加物の添加量は、セメントに対
して０．５〜１０重量％である。添加量が０．５重量％
未満であれば強度の改善効果が少なく、また、乾燥収縮
も低減されない。一方、１０重量％を越えるとブリージ
ング量が多くなるとともに初期強度が無添加のものと比
較して約２／３以下と低くなり、実用性において充分で
ない。The addition amount of the alcohol compound or the alkylene oxide adduct of the lower alcohol is 0.5 to 10% by weight based on the cement. 0.5% by weight
If it is less than the above, the effect of improving the strength is small, and the drying shrinkage is not reduced. On the other hand, if it exceeds 10% by weight, the amount of breathing increases and the initial strength is reduced to about 2/3 or less as compared with the case of no addition, which is not practical.
【００２５】減水剤は、一般的にコンクリート用混和剤
として用いられているものであれば組成の制約は受けな
い。たとえば、ＡＥ減水剤、高性能減水剤、高性能ＡＥ
減水剤、流動化剤として通常使われているものを用いる
ことができる。The water reducing agent is not limited in its composition as long as it is generally used as an admixture for concrete. For example, AE water reducing agent, high performance water reducing agent, high performance AE
What is normally used as a water reducing agent and a fluidizing agent can be used.
【００２６】減水剤の添加量は、セメントに対して０．
０５〜５重量％である。添加量が０．０５重量％未満で
は強度が改善されず、一方、添加量が５重量％を越える
と硬化不良が生じるので好ましくない。The amount of the water reducing agent added is 0.
0.5 to 5% by weight. If the addition amount is less than 0.05% by weight, the strength will not be improved, while if the addition amount exceeds 5% by weight, curing failure will occur, which is not preferable.
【００２７】セメントとしては、通常の水硬性セメント
が用いられる。すなわち、普通ポルトランドセメント、
早強ポルトランドセメント、超早強ポルトランドセメン
ト、中庸熱ポルトランドセメント、耐硫酸塩ポルトラン
ドセメント等のポルトランドセメント、高炉セメント、
フライアッシュセメント等の混合セメントなどが挙げら
れる。As the cement, ordinary hydraulic cement is used. Ie ordinary Portland cement,
Portland cement such as early strength Portland cement, super early strength Portland cement, moderate heat Portland cement, sulfate resistant Portland cement, blast furnace cement,
Examples include mixed cement such as fly ash cement.
【００２８】混練水は、コンクリート用として用いられ
ているものであれば適用でき、特に制約を受けずに用い
ることができる。The kneading water can be applied as long as it is used for concrete, and can be used without particular limitation.
【００２９】本発明における減水剤とアルコール系化合
物又は低級アルコールのアルキレンオキサイド付加物の
添加手段は、普通一般に行われているコンクリート混和
材料の場合と同様でよい。例えば、混練水に予め適量の
減水剤とアルコール系化合物又は低級アルコールのアル
キレンオキサイド付加物を混和した後、または、別々に
他のコンクリート原材料とともに一括して、ミキサーに
投入してもよい。The means for adding the water-reducing agent and the alcohol compound or the alkylene oxide adduct of the lower alcohol in the present invention may be the same as in the commonly used concrete admixture. For example, an appropriate amount of a water-reducing agent and an alcohol compound or an alkylene oxide adduct of a lower alcohol may be mixed in kneading water in advance, or they may be separately charged together with other concrete raw materials into a mixer.
【００３０】本発明の減水剤とアルコール系化合物又は
低級アルコールのアルキレンオキサイド付加物を添加し
たコンクリート組成物の混練には、強制練りミキサ、二
軸ミキサ、ドラムミキサ、オムニミキサ等、従来からコ
ンクリートの混練に使用されているミキサを使用するこ
とができる。For the kneading of a concrete composition containing the water-reducing agent of the present invention and an alcohol compound or an alkylene oxide adduct of a lower alcohol, a kneading mixer, a twin-screw mixer, a drum mixer, an omni mixer or the like can be used for kneading the concrete. The mixer used can be used.
【００３１】本発明の減水剤とアルコール系化合物又は
低級アルコールのアルキレンオキサイド付加物を添加混
練したコンクリートの施工方法は従来の方法をそのまま
用いることができる。The conventional method can be used as it is as a construction method for concrete in which the water reducing agent of the present invention and an alcohol compound or an alkylene oxide adduct of a lower alcohol are added and kneaded.
【００３２】養生方法としては気乾養生、湿空養生、水
中養生、加熱促進養生（蒸気養生、オートクレーブ養
生）等の慣用手段またはこれらを併用したものが用いら
れる。As the curing method, conventional means such as air dry curing, wet air curing, underwater curing, heating accelerated curing (steam curing, autoclave curing), or a combination thereof may be used.
【００３３】[0033]
【実施例】以下、実施例により本発明を説明するが、本
発明はこれに限定されるものではない。The present invention will be described below with reference to examples, but the present invention is not limited thereto.
【００３４】実施例１〜１３、比較例１〜１１ Ａ．再生細骨材、再生粗骨材の調整 再生細骨材、再生粗骨材として表１に示す品質のものを
用いた。このうち、再生粗骨材ｈ１、ｈ２、ｈ３は、そ
れぞれ設計基準強度が３００、２１０、１６０kgf/cm2
のコンクリートをジョークラッシャーで粉砕した後、振
動ふるいにより、「ＪＩＳ Ａ ５００５（コンクリー
ト用砕石） ３．４ 粒度」の砕石２００５の範囲に粒度
を調整したものである。Examples 1 to 13 and Comparative Examples 1 to 11 A. Preparation of Recycled Fine Aggregate and Recycled Coarse Aggregate Recycled fine aggregate and recycled coarse aggregate having the quality shown in Table 1 were used. Of these, recycled coarse aggregates h1, h2, and h3 have design standard strengths of 300, 210, and 160 kgf / cm 2 , respectively.
After crushing the concrete of No. 3 with a jaw crusher, the particle size was adjusted to within the range of crushed stone 2005 of “JIS A 5005 (crushed stone for concrete) 3.4 particle size” by a vibrating sieve.
【００３５】再生細骨材ｆ１、ｆ２，ｆ３は、それぞれ
設計基準強度が３００、２１０、１６０kgf/cm2のコン
クリートをジョークラッシャーで粉砕し、さらにロール
ミルで粉砕した後、振動ふるいにより、「ＪＩＳ Ａ
５００４（コンクリート用砕砂） ４．４ 粒度」の範囲
に粒度を調整したものである。The recycled fine aggregates f1, f2 and f3 were crushed with a jaw crusher of concrete having design standard strengths of 300, 210 and 160 kgf / cm 2 , respectively, and further crushed with a roll mill, and then subjected to a vibrating screen to obtain "JIS A".
5004 (crushed sand for concrete) 4.4 The particle size is adjusted within the range.
【００３６】なお、表中、再生細骨材の表乾比重と吸水
率は、「ＪＩＳ Ａ １１０９（細骨材の比重および吸
水率試験方法）」に準じ、再生粗骨材の表乾比重と吸水
率は、「ＪＩＳ Ａ １１１０（粗骨材の比重および吸
水率試験方法）」に準じて測定した。また、粗粒率は、
「ＪＩＳ Ａ １１０２（骨材のふるい分け試験方
法）」に準じて測定した。In the table, the surface dry specific gravity and the water absorption rate of the recycled fine aggregate are in accordance with "JIS A 1109 (Specific gravity of fine aggregate and water absorption rate test method)" and the surface dry specific gravity of the recycled coarse aggregate. The water absorption rate was measured according to "JIS A 1110 (testing method for specific gravity and water absorption rate of coarse aggregate)". The coarse grain ratio is
It measured according to "JIS A 1102 (aggregate sieving test method)".
【００３７】[0037]
【表１】 [Table 1]
【００３８】Ｂ．骨材以外のコンクリートの原材料 骨材以外のコンクリートの原材料として、下記の表２も
のを用いた。B. Raw materials for concrete other than aggregate As the raw materials for concrete other than aggregate, those shown in Table 2 below were used.
【表２】 [Table 2]
【００３９】Ｃ．コンクリートの配合条件および練り混
ぜ 上記に示した骨材、減水剤、添加剤等を表３に示す配合
条件でコンクリート原材料を一括して強制練りミキサー
（0.05m3）に投入し２分間練り混ぜた。C. Mixing conditions and mixing of concrete Under the mixing conditions shown in Table 3, aggregate raw materials, water reducing agents, additives, etc., were put into a forced mixing mixer (0.05 m 3 ) in a batch and the concrete raw materials were mixed and mixed for 2 minutes. .
【表３】 [Table 3]
【００４０】Ｄ．コンクリートの成形および養生 練り混ぜ後のコンクリートを「ＪＩＳ Ａ １１３２
（コンクリートの強度試験用供試体の作り方）」に準じ
てφ１０×２０ｃｍのコンクリート供試体を作製した。
養生は、２４時間気乾養生（２０℃、８０％ＲＨ）後、
脱型し、７，２８日間水中養生（２０℃）したものと、
２時間前養生（２０℃、８０％ＲＨ）後、蒸気養生（昇
温速度２０℃／時間で６５℃まで昇温し、４時間保持し
た後、１０時間で２０℃になるように降温）し脱型す
る、２種類の方法を用いた。D. Molding and curing of concrete The concrete after kneading is stipulated in JIS A 1132
(How to make specimen for strength test of concrete) ”, a concrete specimen of φ10 × 20 cm was prepared.
After curing for 24 hours in air (20 ° C, 80% RH),
After demolding and curing in water (20 ° C) for 7,28 days,
After curing for 2 hours (20 ° C., 80% RH), steam curing (heating to 65 ° C. at a heating rate of 20 ° C./hour, holding for 4 hours, and then cooling to 20 ° C. in 10 hours) Two methods of demolding were used.
【００４１】Ｅ．圧縮強度試験 養生後、「ＪＩＳ Ａ １１０８（コンクリートの圧縮
強度試験方法）」に準じて圧縮強度を測定した。結果を
表４に示す。E. Compressive strength test After curing, the compressive strength was measured according to "JIS A 1108 (concrete compressive strength test method)". The results are shown in Table 4.
【００４２】[0042]
【表４】 [Table 4]
【００４３】以上の結果、下記のことが明らかになっ
た。As a result of the above, the following has become clear.
【００４４】実施例１〜５は、アルコール系化合物の添
加率と種類を変えてコンクリートの評価を行ったもので
あるが、本発明で規定する０．５〜１０重量％の範囲で
は、比較例１の無添加の場合と比較して、強度が改善さ
れたことがわかる。また、比較例２に示すように本発明
で規定する添加率より少い０．３重量％添加したもの
や、比較例に３に示すように添加量が１０重量％を越え
て１１重量％添加した場合、強度は低かった。In Examples 1 to 5, concrete was evaluated by changing the addition ratio and type of the alcohol compound, but in the range of 0.5 to 10% by weight defined in the present invention, Comparative Examples were compared. It can be seen that the strength is improved as compared to the case of No addition of No. 1 above. Further, as shown in Comparative Example 2, 0.3% by weight, which is lower than the addition rate specified in the present invention, was added, and as shown in Comparative Example 3, the addition amount was more than 10% by weight and 11% by weight was added. The strength was low.
【００４５】また、比較例４に示すように、本発明で規
定するアルコール系化合物（一般式ＲＯＨにおいて、Ｒ
は炭素数４〜６のアルキル基又は炭素数５〜６のシクロ
アルキル基であるアルコール系化合物）以外のアルコー
ル系化合物としてポリエチレングリコール（分子量２０
０００）（試薬特級）を用いた場合、強度の改善効果は
なかった。Further, as shown in Comparative Example 4, an alcohol compound (in the general formula ROH, R
Is polyethylene glycol (molecular weight 20) as an alcohol-based compound other than an alcohol-based compound which is an alkyl group having 4 to 6 carbon atoms or a cycloalkyl group having 5 to 6 carbon atoms.
No. 000) (special grade reagent) was not used to improve the strength.
【００４６】実施例６〜７は、低級アルコールのアルキ
レンオキサイド付加物の添加率を変えてコンクリートの
評価を行ったものであるが、本発明で規定する０．５〜
１０重量％の範囲では、無添加の比較例１と比較して、
強度が改善されている。In Examples 6 to 7, concrete was evaluated by changing the addition ratio of the alkylene oxide adduct of the lower alcohol, and 0.5 to 0.5 specified in the present invention was used.
In the range of 10% by weight, as compared with Comparative Example 1 without addition,
The strength is improved.
【００４７】また、比較例５に示すように、本発明で規
定する低級アルコールのアルキレンオキサイド付加物
（一般式ＲＯ（ＡＯ）ｎＨにおいて、Ｒは炭素数４〜６
のアルキル基で、Ａは炭素数２〜３の１種または２種の
アルキレン基で、ｎは１〜１０の整数である低級アルコ
ールのアルキレンオキサイド付加物）以外の低級アルコ
ールのアルキレンオキサイド付加物としてフェノールの
エチレンオキサイド（付加モル数３）付加物を用いた場
合、強度の改善効果はなかった。Further, as shown in Comparative Example 5, the alkylene oxide adduct of the lower alcohol defined in the present invention (in the general formula RO (AO) nH, R is 4 to 6 carbon atoms)
A is an alkylene oxide adduct of a lower alcohol other than an alkylene oxide adduct of a lower alcohol in which A is one or two alkylene groups having 2 to 3 carbon atoms, and n is an integer of 1 to 10. When an ethylene oxide (addition mol number: 3) adduct of phenol was used, there was no effect of improving the strength.
【００４８】実施例８〜１１は、再生細骨材および再生
粗骨材の種類を変えてコンクリートの評価を行ったもの
であるが、実施例１〜７と同様に強度の改善効果がみら
れた。In Examples 8 to 11, concrete was evaluated by changing the types of recycled fine aggregate and recycled coarse aggregate, and similar to Examples 1 to 7, the effect of improving strength was observed. It was
【００４９】比較例６、７に示すように、吸水率が本発
明の範囲を越える再生細骨材（１２．２重量％）を使用
した場合、コンクリートの強度は改善されなかった。As shown in Comparative Examples 6 and 7, the strength of the concrete was not improved when the recycled fine aggregate (12.2% by weight) having the water absorption exceeding the range of the present invention was used.
【００５０】実施例１２〜１３は、減水剤の添加率を変
えたものであるが、本発明で規定するセメントに対し
て、減水剤の添加率が０．０５未満の比較例８（０．０
３）や、５重量％を越えた比較例９（５．５）の場合、
強度が低いことがわかる。In Examples 12 to 13, the addition ratio of the water reducing agent was changed, but the addition ratio of the water reducing agent was less than 0.05 with respect to the cement specified in the present invention. 0
3) and Comparative Example 9 (5.5) in which the content exceeds 5% by weight,
It can be seen that the strength is low.
【００５１】また、水／セメント比が本発明の規定する
範囲より少ない４５重量％の比較例１０、１１では、強
度は改善されなかった。In Comparative Examples 10 and 11 in which the water / cement ratio was 45% by weight, which was less than the range specified by the present invention, the strength was not improved.
【００５２】Ｆ．乾燥収縮試験 表３の実施例１〜１３の配合のコンクリートについて、
１０×１０×４０ｃｍのコンクリート供試体を作製し、
２４時間気乾養生（２０℃、８０％ＲＨ）後、脱型し、
１年間気乾養生（２０℃、６０％ＲＨ）しながら、「Ｊ
ＩＳ Ａ １１２９（モルタル及びコンクリートの長さ
変化試験方法） ２．３ ダイアルゲージ法」に準じて乾
燥収縮量を測定した。その結果、いずれも乾燥収縮率は
約４０％低くなり、本発明の範囲において、再生骨材を
使用したコンクリートでも、従来の乾燥収縮低減剤によ
る低減効果が得られることを確認した。F. Dry Shrinkage Test Regarding the concretes of the compositions of Examples 1 to 13 in Table 3,
Make a concrete specimen of 10 × 10 × 40 cm,
After air-drying curing (20 ° C, 80% RH) for 24 hours, demolding,
While air-curing for 1 year (20 ℃, 60% RH),
The drying shrinkage amount was measured in accordance with "IS A 1129 (Method for testing length change of mortar and concrete) 2.3 Dial gauge method". As a result, the dry shrinkage was reduced by about 40% in all cases, and it was confirmed that the conventional dry shrinkage-reducing agent provided the reducing effect even in the concrete using recycled aggregate within the scope of the present invention.
【００５３】[0053]
【発明の効果】本発明の再生骨材を用いたコンクリート
組成物は、充分な強度を発現し、かつ、乾燥収縮も通常
のコンクリート並以下とすることができるので、再生骨
材を用いたコンクリートの利用範囲を擁壁や橋梁下部工
等従来使用できなかった構造物まで広げることができる
とともに、処分に苦慮していたコンクリート廃材の大量
処理を図ることができる。INDUSTRIAL APPLICABILITY The concrete composition using the recycled aggregate of the present invention exhibits sufficient strength and can be dried and shrunk at or below the level of ordinary concrete. The scope of use can be expanded to structures that could not be used in the past, such as retaining walls and bridge substructures, and large-scale processing of concrete waste materials that were difficult to dispose can be achieved.
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 庁内整理番号 ＦＩ 技術表示箇所 Ｃ０４Ｂ 111:34 ─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 6 Identification code Internal reference number FI technical display area C04B 111: 34
Claims (3)
量％以上のコンクリートにおいて、下記（１）式で示さ
れるアルコール系化合物をセメントの０．５〜１０重量
％、および減水剤をセメントの０．０５〜５重量％含
み、かつ再生細骨材の吸水率が１１重量％以下である再
生骨材を用いたコンクリート組成物。 ＲＯＨ （１） （(１)式中、Ｒは炭素数４〜６のアルキル基又は炭素数
５〜６のシクロアルキル基）Claims: 1. In concrete using recycled aggregate in a water / cement ratio of 50% by weight or more, an alcohol compound represented by the following formula (1) is added in an amount of 0.5 to 10% by weight of cement, and a water reducing agent. A concrete composition using recycled aggregate containing 0.05 to 5% by weight of cement and having a water absorption rate of the recycled fine aggregate of 11% by weight or less. ROH (1) (wherein R is an alkyl group having 4 to 6 carbon atoms or a cycloalkyl group having 5 to 6 carbon atoms)
が、ｔｅｒｔ−ブチルアルコールである請求項１記載の
再生骨材を用いたコンクリート組成物。2. The concrete composition using the recycled aggregate according to claim 1, wherein the alcohol compound represented by the formula (1) is tert-butyl alcohol.
量％以上のコンクリートにおいて、下記（２）式で示さ
れる低級アルコールのアルキレンオキサイド付加物をセ
メントの０．５〜１０重量％、および減水剤をセメント
の０．０５〜５重量％含み、かつ再生細骨材の吸水率が
１１重量％以下である再生骨材を用いたコンクリート組
成物。 ＲＯ（ＡＯ）ｎＨ （２） （(２)式中、Ｒは炭素数４〜６のアルキル基、Ａは炭素
数２〜３の１種または２種のアルキレン基、ｎは１〜１
０の整数）3. A concrete using a recycled aggregate in a water / cement ratio of 50% by weight or more, wherein an alkylene oxide adduct of a lower alcohol represented by the following formula (2) is added in an amount of 0.5 to 10% by weight of the cement, And a concrete composition using a recycled aggregate containing a water reducing agent in an amount of 0.05 to 5% by weight of cement and having a water absorption rate of the recycled fine aggregate of 11% by weight or less. RO (AO) nH (2) (In the formula (2), R is an alkyl group having 4 to 6 carbon atoms, A is one or two alkylene groups having 2 to 3 carbon atoms, and n is 1 to 1).
An integer of 0)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22730695A JPH0952743A (en) | 1995-08-11 | 1995-08-11 | Regenerated aggregate concrete composition |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22730695A JPH0952743A (en) | 1995-08-11 | 1995-08-11 | Regenerated aggregate concrete composition |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0952743A true JPH0952743A (en) | 1997-02-25 |
Family
ID=16858747
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP22730695A Pending JPH0952743A (en) | 1995-08-11 | 1995-08-11 | Regenerated aggregate concrete composition |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0952743A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004323294A (en) * | 2003-04-24 | 2004-11-18 | Taiheiyo Cement Corp | Concrete |
| JP2005047136A (en) * | 2003-07-28 | 2005-02-24 | Maeda Corp | Manufacturing method of precast concrete |
| JP2006334946A (en) * | 2005-06-02 | 2006-12-14 | Tokyo Electric Power Co Inc:The | Method for producing secondary concrete product |
| JP2008184350A (en) * | 2007-01-29 | 2008-08-14 | Sumitomo Osaka Cement Co Ltd | Drying shrinkage reduction method of concrete using high water absorption regenerated aggregate |
| JP2009040655A (en) * | 2007-08-10 | 2009-02-26 | Hokkaido Univ | Cement hardened body and manufacturing method of recycled fine aggregate used as the hardened body |
| CN109534764A (en) * | 2018-11-22 | 2019-03-29 | 盐城欣昌新型建材有限公司 | Utilize the reinforced photovoltaic cement pipe pile and preparation method thereof of regeneration concrete |
| CN110723942A (en) * | 2019-10-24 | 2020-01-24 | 常树高 | High-strength concrete formula and preparation method thereof |
-
1995
- 1995-08-11 JP JP22730695A patent/JPH0952743A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004323294A (en) * | 2003-04-24 | 2004-11-18 | Taiheiyo Cement Corp | Concrete |
| JP4520106B2 (en) * | 2003-04-24 | 2010-08-04 | 太平洋セメント株式会社 | concrete |
| JP2005047136A (en) * | 2003-07-28 | 2005-02-24 | Maeda Corp | Manufacturing method of precast concrete |
| JP2006334946A (en) * | 2005-06-02 | 2006-12-14 | Tokyo Electric Power Co Inc:The | Method for producing secondary concrete product |
| JP2008184350A (en) * | 2007-01-29 | 2008-08-14 | Sumitomo Osaka Cement Co Ltd | Drying shrinkage reduction method of concrete using high water absorption regenerated aggregate |
| JP2009040655A (en) * | 2007-08-10 | 2009-02-26 | Hokkaido Univ | Cement hardened body and manufacturing method of recycled fine aggregate used as the hardened body |
| CN109534764A (en) * | 2018-11-22 | 2019-03-29 | 盐城欣昌新型建材有限公司 | Utilize the reinforced photovoltaic cement pipe pile and preparation method thereof of regeneration concrete |
| CN110723942A (en) * | 2019-10-24 | 2020-01-24 | 常树高 | High-strength concrete formula and preparation method thereof |
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