JP6991523B1 - Manufacturing method of solidified body - Google Patents
Manufacturing method of solidified body Download PDFInfo
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- JP6991523B1 JP6991523B1 JP2020170972A JP2020170972A JP6991523B1 JP 6991523 B1 JP6991523 B1 JP 6991523B1 JP 2020170972 A JP2020170972 A JP 2020170972A JP 2020170972 A JP2020170972 A JP 2020170972A JP 6991523 B1 JP6991523 B1 JP 6991523B1
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 18
- 239000002893 slag Substances 0.000 claims abstract description 47
- 239000000843 powder Substances 0.000 claims abstract description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 16
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 15
- 239000010959 steel Substances 0.000 claims abstract description 15
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 claims abstract description 11
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 claims abstract description 8
- 239000012783 reinforcing fiber Substances 0.000 claims abstract description 5
- 239000004568 cement Substances 0.000 claims description 6
- 239000002440 industrial waste Substances 0.000 abstract description 7
- 230000007613 environmental effect Effects 0.000 abstract description 6
- 230000009467 reduction Effects 0.000 abstract description 4
- 238000009628 steelmaking Methods 0.000 abstract description 4
- 230000008929 regeneration Effects 0.000 abstract description 3
- 238000011069 regeneration method Methods 0.000 abstract description 3
- 239000004576 sand Substances 0.000 abstract description 3
- 239000004575 stone Substances 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 abstract 1
- 238000010276 construction Methods 0.000 description 15
- 238000000034 method Methods 0.000 description 14
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 6
- 239000013078 crystal Substances 0.000 description 6
- 239000010440 gypsum Substances 0.000 description 6
- 229910052602 gypsum Inorganic materials 0.000 description 6
- 238000004898 kneading Methods 0.000 description 6
- 238000011161 development Methods 0.000 description 5
- 230000018109 developmental process Effects 0.000 description 5
- 239000011230 binding agent Substances 0.000 description 4
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 239000001569 carbon dioxide Substances 0.000 description 3
- 229910002092 carbon dioxide Inorganic materials 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 235000019738 Limestone Nutrition 0.000 description 2
- TWRXJAOTZQYOKJ-UHFFFAOYSA-L Magnesium chloride Chemical compound [Mg+2].[Cl-].[Cl-] TWRXJAOTZQYOKJ-UHFFFAOYSA-L 0.000 description 2
- CSNNHWWHGAXBCP-UHFFFAOYSA-L Magnesium sulfate Chemical compound [Mg+2].[O-][S+2]([O-])([O-])[O-] CSNNHWWHGAXBCP-UHFFFAOYSA-L 0.000 description 2
- 239000011398 Portland cement Substances 0.000 description 2
- WCUXLLCKKVVCTQ-UHFFFAOYSA-M Potassium chloride Chemical compound [Cl-].[K+] WCUXLLCKKVVCTQ-UHFFFAOYSA-M 0.000 description 2
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 2
- -1 and generally Substances 0.000 description 2
- 238000005452 bending Methods 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 238000006703 hydration reaction Methods 0.000 description 2
- 239000010410 layer Substances 0.000 description 2
- 239000006028 limestone Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000004570 mortar (masonry) Substances 0.000 description 2
- 239000013535 sea water Substances 0.000 description 2
- 239000002344 surface layer Substances 0.000 description 2
- 238000010792 warming Methods 0.000 description 2
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 239000001110 calcium chloride Substances 0.000 description 1
- 229910001628 calcium chloride Inorganic materials 0.000 description 1
- 235000011148 calcium chloride Nutrition 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 239000003673 groundwater Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 229910001629 magnesium chloride Inorganic materials 0.000 description 1
- 235000011147 magnesium chloride Nutrition 0.000 description 1
- 229910052943 magnesium sulfate Inorganic materials 0.000 description 1
- 235000019341 magnesium sulphate Nutrition 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000005445 natural material Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 239000001103 potassium chloride Substances 0.000 description 1
- 235000011164 potassium chloride Nutrition 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 235000002639 sodium chloride Nutrition 0.000 description 1
- 229910052938 sodium sulfate Inorganic materials 0.000 description 1
- 235000011152 sodium sulphate Nutrition 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000002352 surface water Substances 0.000 description 1
- 239000002351 wastewater Substances 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
- 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)
- Curing Cements, Concrete, And Artificial Stone (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
Abstract
【課題】環境負荷軽減に寄与し、産業廃棄物として蓄積されているスラグの有効再生活用に資する固化体の製造方法を提供すること。【解決手段】本発明に係る固化体の製造方法は、鉄鋼スラグ（製鋼スラグ、水砕スラグ）と、高炉スラグ微粉末と、塩化物イオン及び硫酸イオンを含む混練水とを混練し、固化体を製造することを特徴とする。上記固化体の製造方法において、補強繊維を混練してもよい。鉄鋼スラグは骨材として用いるものであり、骨材として鉄鋼スラグのみを用いてもよいし、その一定量（例えば１０～２０重量％）を天然石や天然砂等で置換してもよい。【選択図】なしPROBLEM TO BE SOLVED: To provide a method for producing a solidified body which contributes to reduction of environmental load and contributes to effective regeneration and utilization of slag accumulated as industrial waste. SOLUTION: The method for producing a solidified body according to the present invention is to knead steel slag (steelmaking slag, granulated slag), blast furnace slag fine powder, and kneaded water containing chloride ion and sulfate ion to solidify the solidified body. It is characterized by manufacturing. In the method for producing the solidified body, the reinforcing fibers may be kneaded. The steel slag is used as an aggregate, and only steel slag may be used as the aggregate, or a certain amount (for example, 10 to 20% by weight) thereof may be replaced with natural stone, natural sand, or the like. [Selection diagram] None
Description
本発明は、例えば、スラグを有効利用することができ、かつ、セメントの使用を不要とする固化体の製造方法に関する。 The present invention relates to, for example, a method for producing a solidified body that can effectively utilize slag and does not require the use of cement.
従来、モルタルやコンクリートの結合材にはセメントが使用され、一般的には、石灰石を主原料としたポルトランドセメントが多く用いられている。 Conventionally, cement has been used as a binder for mortar and concrete, and generally, Portland cement mainly made of limestone is used.
しかし、ポルトランドセメントの製造工程（原料である石灰石を焼成する工程）では、地球温暖化ガスである二酸化炭素が大量に排出されるという問題がある。一方で、製鉄所内において鉄鋼製造の過程で生成される鉄鋼スラグは、一部が有価物として再利用されているものの、大半は産業廃棄物として蓄積されている。 However, in the process of manufacturing Portland cement (the process of firing limestone, which is a raw material), there is a problem that a large amount of carbon dioxide, which is a global warming gas, is emitted. On the other hand, most of the steel slag produced in the steel manufacturing process in steelworks is accumulated as industrial waste, although some of it is reused as valuable resources.
本発明は上述の事柄に留意してなされたもので、その目的は、環境負荷軽減に寄与し、産業廃棄物として蓄積されているスラグの有効再生活用に資する固化体の製造方法を提供することにある。 The present invention has been made in consideration of the above-mentioned matters, and an object thereof is to provide a method for producing a solidified body which contributes to reduction of environmental load and contributes to effective regeneration and utilization of slag accumulated as industrial waste. It is in.
上記目的を達成するために、本発明に係る固化体の製造方法は、鉄鋼スラグと、高炉スラグ微粉末と、塩化物イオンの濃度が１９～２０ｇ／ｋｇであり、硫酸イオンの濃度が２．５～３．０ｇ／ｋｇである混練水とを混練し、セメントを用いずに固化体を製造する（請求項１）。ここで、鉄鋼スラグは骨材として用いるものであり、骨材として鉄鋼スラグのみを用いてもよいし、その一定量（例えば１０～２０重量％）を天然石や天然砂等で置換してもよい。 In order to achieve the above object, the method for producing the solidified body according to the present invention comprises steel slag, blast furnace slag fine powder, chloride ion concentration of 19 to 20 g / kg, and sulfate ion concentration of 2. Kneading with kneaded water having a concentration of 5 to 3.0 g / kg to produce a solidified body without using cement (claim 1). Here, the steel slag is used as an aggregate, and only the steel slag may be used as the aggregate, or a certain amount (for example, 10 to 20% by weight) thereof may be replaced with natural stone, natural sand, or the like. ..
上記固化体の製造方法において、補強繊維も混練してもよい（請求項２）。 In the method for producing the solidified body, the reinforcing fibers may also be kneaded (claim 2).
本願発明では、環境負荷軽減に寄与し、産業廃棄物として蓄積されているスラグの有効再生活用に資する固化体の製造方法が得られる。 According to the present invention, a method for producing a solidified body that contributes to the reduction of environmental load and contributes to the effective regeneration and utilization of slag accumulated as industrial waste can be obtained.
すなわち、本願の各請求項に係る発明の固化体の製造方法は、結合材として高炉スラグ微粉末を使用し、セメントを用いないようにすることにより、二酸化炭素の排出量を削減できるので、環境負荷軽減に大いに寄与するものとなる。 That is, in the method for producing the solidified body of the invention according to each claim of the present application, carbon dioxide emissions can be reduced by using blast furnace slag fine powder as a binder and not using cement, so that the environment can be reduced. It will greatly contribute to load reduction.
また、高炉スラグ微粉末により、固化体の流動性向上を図ることもできる。 Further, the fluidity of the solidified body can be improved by using the blast furnace slag fine powder.
さらに、高炉スラグ微粉末の水和反応を促進する塩化物イオンにより、固化体の早期強度発現が可能となり、スラグと反応しエトリンガイド結晶を生成する硫酸イオンにより、固化体の強度を増加させることができる。もちろん、水硬性がある鉄鋼スラグ（製鋼スラグ、水砕スラグ）によっても固化体の強度は高まることになる。 Furthermore, the chloride ion that promotes the hydration reaction of the blast furnace slag fine powder enables early development of the strength of the solidified body, and the sulfate ion that reacts with the slag to generate ettrin-guided crystals increases the strength of the solidified body. be able to. Of course, the strength of the solidified body is also increased by the hydraulic slag (steelmaking slag, granulated slag).
しかも、請求項１に係る発明の固化体の製造方法では、産業廃棄物である鉄鋼スラグの更なる有効活用による一層の環境負荷軽減をも図ることができる。 Moreover, in the method for producing a solidified body of the invention according to claim 1, it is possible to further reduce the environmental load by further effectively utilizing steel slag, which is an industrial waste.
請求項２に係る発明の固化体の製造方法では、固化体の耐久性、曲げ強度や靭性等の向上を図ることができる。 The method for producing a solidified body according to claim 2 can improve the durability, bending strength, toughness, and the like of the solidified body.
本発明の実施の形態について以下に説明する。 Embodiments of the present invention will be described below.
本例の固化体の製造方法（以下、「本方法」と略称する。）では、鉄鋼スラグ（製鋼スラグ、水砕スラグ）と、高炉スラグ微粉末と、塩化物イオン及び硫酸イオンを含む混練水と、必要に応じて混和剤（例えばＡＥ減水剤）とを混練し、固化体を製造する。本方法における固化体１ｍ３ 当たりの混合割合は、水が２３０～２９０ｋｇ、製鋼スラグが０～１２５０ｋｇ、水砕スラグが４００～１６００ｋｇ、高炉スラグ微粉末が５００～７２０ｋｇ、混和剤が０～７２００ｇを標準とする。 In the method for producing the solidified body of this example (hereinafter, abbreviated as "this method"), steel slag (steelmaking slag, granulated slag), blast furnace slag fine powder, and kneaded water containing chloride ion and sulfate ion are used. And, if necessary, an admixture (for example, an AE water reducing agent) is kneaded to produce a solidified product. The mixing ratio per 1 m 3 of the solidified body in this method is 230 to 290 kg for water, 0 to 1250 kg for steelmaking slag, 400 to 1600 kg for granulated slag, 500 to 720 kg for blast furnace slag fine powder, and 0 to 7200 g for admixture. Standard.
本方法では、鉄鋼スラグを骨材（粗骨材及び細骨材）として用いるのであり、産業廃棄物の有効活用による環境負荷軽減の面からは、鉄鋼スラグのみを骨材と用いるのが好ましいが、例えば、その一定量（例えば１０～２０重量％）を、自然物（砂利や砂、火山灰）等のうち、適宜の粒径のものに置換してもよい。 In this method, steel slag is used as an aggregate (coarse aggregate and fine aggregate), and it is preferable to use only steel slag as an aggregate from the viewpoint of reducing the environmental load by effectively utilizing industrial waste. For example, a certain amount thereof (for example, 10 to 20% by weight) may be replaced with a natural substance (gravel, sand, volcanic ash) or the like having an appropriate particle size.
骨材として鉄鋼スラグを用いる本方法の場合、スラグ塊を粗骨材、水砕スラグを細骨材として用いることが考えられる。 In the case of this method using steel slag as the aggregate, it is conceivable to use the slag mass as the coarse aggregate and the granulated slag as the fine aggregate.
塩化物イオン及び硫酸イオンを含む混練水としては、例えば、海水や汽水をそのまま用いてもよいし、海水・汽水の他、上水・中水やその原水（例えば地表水、伏流水、地下水、雨水、雑排水）等に、適宜の物質（例えば塩化ナトリウム、塩化マグネシウム、塩化カルシウム、塩化カリウム、硫酸ナトリウム、硫酸マグネシウム）を混ぜたものを用いてもよい。この場合、塩化物イオンおよび硫酸イオンの濃度は、それぞれ１９～２０ｇ／ｋｇおよび２．５～３．０ｇ／ｋｇの範囲が適していると考えられる。 As the kneading water containing chloride ion and sulfate ion, for example, seawater or brackish water may be used as it is, or in addition to seawater / brackish water, clean water / medium water and its raw water (for example, surface water, underflow water, groundwater, etc.) A mixture of an appropriate substance (for example, sodium chloride, magnesium chloride, calcium chloride, potassium chloride, sodium sulfate, magnesium sulfate) with rainwater, miscellaneous wastewater, or the like may be used. In this case, the concentrations of chloride ion and sulfate ion are considered to be suitable in the ranges of 19 to 20 g / kg and 2.5 to 3.0 g / kg, respectively.
本方法における混練は、骨材等の混練材料を例えば二軸強制練りミキサーなどの混練機に投入して行うことができる。 The kneading in this method can be performed by putting a kneading material such as an aggregate into a kneading machine such as a twin-screw forced kneading mixer.
以上説明した本方法は、結合材として高炉スラグ微粉末を使用し、セメントを用いないようにすることにより、二酸化炭素の排出量を削減できる上、産業廃棄物である高炉スラグ微粉末を有効活用することにもなるので、環境負荷軽減に大いに寄与するものとなる。 This method described above uses blast furnace slag fine powder as a binder and eliminates the use of cement, which can reduce carbon dioxide emissions and effectively utilize blast furnace slag fine powder, which is an industrial waste. This will greatly contribute to reducing the environmental load.
また、高炉スラグ微粉末により、固化体の流動性向上を図ることもできる。 Further, the fluidity of the solidified body can be improved by using the blast furnace slag fine powder.
さらに、高炉スラグ微粉末の水和反応を促進する塩化物イオンにより、固化体の早期強度発現が可能となり、スラグと反応しエトリンガイド結晶を生成する硫酸イオンにより、固化体の強度を増加させることができる。もちろん、骨材として用いる鉄鋼スラグも水硬性があるので、この点でも固化体の強度は高まることになる。 Furthermore, the chloride ion that promotes the hydration reaction of the blast furnace slag fine powder enables early development of the strength of the solidified body, and the sulfate ion that reacts with the slag to generate ettrin-guided crystals increases the strength of the solidified body. be able to. Of course, the steel slag used as the aggregate is also hydraulic, so the strength of the solidified body is increased in this respect as well.
本方法により得られる固化体は、従来のモルタルやコンクリートの代わりとなり得るものであり、例えば、海洋・沿岸インフラ整備事業（<海岸線後退防止・島嶼地域国土安全のための造成：地球温暖化に伴う海水面上昇への影響対策>、<人工島築造による国土造成事業：津波・高潮対策用の防潮堤整備事業>）、河川整備（<洪水対策用の築堤事業・堤防嵩上げ事業>、<土石流・火砕流対策事業：導流堤築造>、<砂防事業：砂防堰堤築造>）、道路整備事業（<市町村道・山道・林道におけるコンクリート系舗装道路：基盤、基層、表層>）、その他（<工事用道路におけるコンクリート系舗装道路：基盤、基層、表層>、<駐車場、工場・倉庫造成、一般造成>）といった事業に適用可能であり、海洋・沿岸工事、河川工事（堰堤、防波堤、消波工、人工地盤、堤防、砂防ダム、導流堤）、道路工事、道路系工事（<本設道路、仮設道路>、<駐車場舗装工事、工場・倉庫造成工事、一般造成工事>）といった工種に適用可能である。 The solidified body obtained by this method can replace conventional mortar and concrete. For example, marine and coastal infrastructure development projects (<prevention of coastline retreat / creation for national security of island regions: accompanying global warming] Countermeasures for impacts on sea level rise>, <National land development project by constructing artificial islands: levee development project for tsunami and high tide countermeasures>), river improvement (<dam levee project for flood countermeasures / levee raising project>, <earth and stone flow / Fire crushing flow countermeasure business: dike construction>, <sabo business: sabo dam construction>), road maintenance business (<concrete paved roads on municipal roads, mountain roads, forest roads: foundation, base layer, surface layer>), etc. (<for construction Concrete paved roads: Bases, base layers, surface layers>, <parking lots, factory / warehouse construction, general construction>), and can be applied to marine / coastal construction and river construction (dams, breakwaters, wave-dissipating works). , Artificial ground, embankment, sabo dam, dike), road construction, road system construction (<main road, temporary road>, <parking lot paving construction, factory / warehouse construction construction, general construction construction>) Applicable.
なお、本発明は、上記の実施の形態に何ら限定されず、本発明の要旨を逸脱しない範囲において種々に変形して実施し得ることは勿論である。例えば、以下のような変形例を挙げることができる。 It should be noted that the present invention is not limited to the above-described embodiment, and it is needless to say that the present invention can be variously modified and implemented without departing from the gist of the present invention. For example, the following modification examples can be given.
本方法において、補強繊維も混練するようにしてもよい。この場合、固化体の耐久性、曲げ強度や靭性等の向上を図ることができ、特に道路盤等に用いて好適な固化体が得られる。補強繊維としては、例えば補強有機繊維であるポリプロピレン繊維（萩原工業株式会社製バルチップ等）を挙げることができる。 In this method, the reinforcing fibers may also be kneaded. In this case, the durability, bending strength, toughness, etc. of the solidified body can be improved, and a solidified body particularly suitable for use in a roadbed or the like can be obtained. Examples of the reinforcing fiber include polypropylene fiber (Balchip manufactured by Hagiwara Industries, Ltd.) which is a reinforcing organic fiber.
また、例えば災害復旧用迂回路舗装道路のように、高速施工が望まれる場合は、本方法においてアルカリイオンも混練するようにしてもよい。具体的には、混練水に水酸化ナトリウム等を混入しておくといった方法が考えられる。 Further, when high-speed construction is desired, for example, a detour paved road for disaster recovery, alkaline ions may also be kneaded in this method. Specifically, a method of mixing sodium hydroxide or the like in the kneaded water can be considered.
ここで、高炉スラグ微粉末を結合材として用いる従来の固化体の製造方法では、通常、石膏を混練する。これは、高炉スラグ微粉末が緻密な結晶構造を形成し、硬化時に収縮によるひび割れが発生し易くなる点を考慮し、石膏を入れておくことにより、硬化初期にエトリンガイド結晶を生成し、収縮し難い結晶構造を形成することでひび割れ発生を抑制するためである。しかし、石膏は固体であり高炉スラグ微粉末との混合性で劣るため、石膏を多めに含ませたり、水を混ぜる前に石膏と高炉スラグ微粉末とを均一に混ぜるための別工程を設けたりする必要が生じる。そこで、本方法において、石膏を用いないようにしてもよく、この場合でも、本方法では硫酸イオンを含んだ混練水を用いるので、硫酸イオンによってエトリンガイド結晶を生成し、ひび割れ発生の抑制を図ることができ、しかも、その混合性に優れるので、硫酸イオンを多めに使用したり、別工程を設けたりする必要がない、といったメリットが得られる。 Here, in the conventional method for producing a solidified body using blast furnace slag fine powder as a binder, gypsum is usually kneaded. This is because the blast furnace slag fine powder forms a dense crystal structure and cracks due to shrinkage are likely to occur during curing. By adding gypsum, ettrin guide crystals are generated at the initial stage of curing. This is to suppress the occurrence of cracks by forming a crystal structure that does not easily shrink. However, since gypsum is solid and inferior in mixing with blast furnace slag fine powder, a large amount of gypsum may be added, or a separate step may be provided to evenly mix the gypsum and blast furnace slag fine powder before mixing with water. Need to be done. Therefore, in this method, gypsum may not be used, and even in this case, since kneaded water containing sulfate ions is used, ettrin guide crystals are generated by the sulfate ions to suppress the occurrence of cracks. Since it can be achieved and its mixing property is excellent, there is an advantage that it is not necessary to use a large amount of sulfate ions or to provide a separate process.
本明細書で挙げた変形例どうしを適宜組み合わせてもよいことはいうまでもない。 Needless to say, the modifications given in the present specification may be combined as appropriate.
Claims (2)
The method for producing a solidified body according to claim 1, wherein the reinforcing fibers are also kneaded.
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| JP2001270746A (en) * | 2000-03-28 | 2001-10-02 | Kawasaki Steel Corp | Method for producing slag hardened body |
| JP2003002726A (en) * | 2001-04-18 | 2003-01-08 | Nippon Steel Corp | Producing method of concrete like solid body using steel making slag |
| JP2004292296A (en) * | 2003-03-28 | 2004-10-21 | Jfe Steel Kk | Method of manufacturing slag hardened body |
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