JP2015020924A - Blast furnace slag containing-cement slurry composition and preparation method of soil cement slurry using the same - Google Patents
Blast furnace slag containing-cement slurry composition and preparation method of soil cement slurry using the same Download PDFInfo
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- JP2015020924A JP2015020924A JP2013149236A JP2013149236A JP2015020924A JP 2015020924 A JP2015020924 A JP 2015020924A JP 2013149236 A JP2013149236 A JP 2013149236A JP 2013149236 A JP2013149236 A JP 2013149236A JP 2015020924 A JP2015020924 A JP 2015020924A
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- cement slurry
- mass
- blast furnace
- furnace slag
- water
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- 239000002002 slurry Substances 0.000 title claims abstract description 94
- 239000004568 cement Substances 0.000 title claims abstract description 81
- 239000000203 mixture Substances 0.000 title claims abstract description 76
- 239000002893 slag Substances 0.000 title claims abstract description 49
- 239000002689 soil Substances 0.000 title claims abstract description 38
- 238000002360 preparation method Methods 0.000 title abstract description 12
- 229920006163 vinyl copolymer Polymers 0.000 claims abstract description 50
- 239000011230 binding agent Substances 0.000 claims abstract description 43
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 40
- 239000000843 powder Substances 0.000 claims abstract description 18
- 239000000126 substance Substances 0.000 claims description 58
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 claims description 47
- 238000000034 method Methods 0.000 claims description 22
- 125000004435 hydrogen atom Chemical group [H]* 0.000 claims description 20
- 150000001875 compounds Chemical class 0.000 claims description 18
- 229920000877 Melamine resin Polymers 0.000 claims description 16
- 239000011398 Portland cement Substances 0.000 claims description 15
- JDSHMPZPIAZGSV-UHFFFAOYSA-N melamine Chemical compound NC1=NC(N)=NC(N)=N1 JDSHMPZPIAZGSV-UHFFFAOYSA-N 0.000 claims description 15
- 229910052751 metal Inorganic materials 0.000 claims description 14
- 239000002184 metal Substances 0.000 claims description 14
- LSNNMFCWUKXFEE-UHFFFAOYSA-M Bisulfite Chemical compound OS([O-])=O LSNNMFCWUKXFEE-UHFFFAOYSA-M 0.000 claims description 11
- 150000003839 salts Chemical class 0.000 claims description 11
- 239000010440 gypsum Substances 0.000 claims description 10
- 229910052602 gypsum Inorganic materials 0.000 claims description 10
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 claims description 10
- 238000002156 mixing Methods 0.000 claims description 9
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- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical group [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 claims description 8
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- 125000003277 amino group Chemical group 0.000 claims description 7
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- BDHFUVZGWQCTTF-UHFFFAOYSA-M sulfonate Chemical compound [O-]S(=O)=O BDHFUVZGWQCTTF-UHFFFAOYSA-M 0.000 claims description 4
- RGHNJXZEOKUKBD-SQOUGZDYSA-M D-gluconate Chemical compound OC[C@@H](O)[C@@H](O)[C@H](O)[C@@H](O)C([O-])=O RGHNJXZEOKUKBD-SQOUGZDYSA-M 0.000 claims description 3
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- 238000002347 injection Methods 0.000 abstract description 8
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- 230000000694 effects Effects 0.000 description 5
- 238000011065 in-situ storage Methods 0.000 description 5
- 229910052757 nitrogen Inorganic materials 0.000 description 5
- 238000003786 synthesis reaction Methods 0.000 description 5
- VZCYOOQTPOCHFL-UHFFFAOYSA-N trans-butenedioic acid Natural products OC(=O)C=CC(O)=O VZCYOOQTPOCHFL-UHFFFAOYSA-N 0.000 description 5
- LCPVQAHEFVXVKT-UHFFFAOYSA-N 2-(2,4-difluorophenoxy)pyridin-3-amine Chemical compound NC1=CC=CN=C1OC1=CC=C(F)C=C1F LCPVQAHEFVXVKT-UHFFFAOYSA-N 0.000 description 4
- OZAIFHULBGXAKX-UHFFFAOYSA-N 2-(2-cyanopropan-2-yldiazenyl)-2-methylpropanenitrile Chemical compound N#CC(C)(C)N=NC(C)(C)C#N OZAIFHULBGXAKX-UHFFFAOYSA-N 0.000 description 4
- CERQOIWHTDAKMF-UHFFFAOYSA-N Methacrylic acid Chemical compound CC(=C)C(O)=O CERQOIWHTDAKMF-UHFFFAOYSA-N 0.000 description 4
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- 229920001577 copolymer Polymers 0.000 description 4
- 239000002270 dispersing agent Substances 0.000 description 4
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 4
- CHQMHPLRPQMAMX-UHFFFAOYSA-L sodium persulfate Substances [Na+].[Na+].[O-]S(=O)(=O)OOS([O-])(=O)=O CHQMHPLRPQMAMX-UHFFFAOYSA-L 0.000 description 4
- AEQDJSLRWYMAQI-UHFFFAOYSA-N 2,3,9,10-tetramethoxy-6,8,13,13a-tetrahydro-5H-isoquinolino[2,1-b]isoquinoline Chemical compound C1CN2CC(C(=C(OC)C=C3)OC)=C3CC2C2=C1C=C(OC)C(OC)=C2 AEQDJSLRWYMAQI-UHFFFAOYSA-N 0.000 description 3
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 description 3
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 3
- 125000004106 butoxy group Chemical group [*]OC([H])([H])C([H])([H])C(C([H])([H])[H])([H])[H] 0.000 description 3
- 239000003153 chemical reaction reagent Substances 0.000 description 3
- 238000010276 construction Methods 0.000 description 3
- 239000001530 fumaric acid Substances 0.000 description 3
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 description 3
- 230000001603 reducing effect Effects 0.000 description 3
- 239000000176 sodium gluconate Substances 0.000 description 3
- 229940005574 sodium gluconate Drugs 0.000 description 3
- 235000012207 sodium gluconate Nutrition 0.000 description 3
- CIWBSHSKHKDKBQ-JLAZNSOCSA-N Ascorbic acid Chemical compound OC[C@H](O)[C@H]1OC(=O)C(O)=C1O CIWBSHSKHKDKBQ-JLAZNSOCSA-N 0.000 description 2
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 2
- 239000005977 Ethylene Substances 0.000 description 2
- WOBHKFSMXKNTIM-UHFFFAOYSA-N Hydroxyethyl methacrylate Chemical compound CC(=C)C(=O)OCCO WOBHKFSMXKNTIM-UHFFFAOYSA-N 0.000 description 2
- OFOBLEOULBTSOW-UHFFFAOYSA-N Propanedioic acid Natural products OC(=O)CC(O)=O OFOBLEOULBTSOW-UHFFFAOYSA-N 0.000 description 2
- 239000004373 Pullulan Substances 0.000 description 2
- 229920001218 Pullulan Polymers 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 239000000440 bentonite Substances 0.000 description 2
- 229910000278 bentonite Inorganic materials 0.000 description 2
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 description 2
- 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 2
- HNEGQIOMVPPMNR-IHWYPQMZSA-N citraconic acid Chemical compound OC(=O)C(/C)=C\C(O)=O HNEGQIOMVPPMNR-IHWYPQMZSA-N 0.000 description 2
- 229940018557 citraconic acid Drugs 0.000 description 2
- 239000004567 concrete Substances 0.000 description 2
- LDHQCZJRKDOVOX-NSCUHMNNSA-N crotonic acid Chemical compound C\C=C\C(O)=O LDHQCZJRKDOVOX-NSCUHMNNSA-N 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 150000004683 dihydrates Chemical class 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 125000001301 ethoxy group Chemical group [H]C([H])([H])C([H])([H])O* 0.000 description 2
- NVVZQXQBYZPMLJ-UHFFFAOYSA-N formaldehyde;naphthalene-1-sulfonic acid Chemical compound O=C.C1=CC=C2C(S(=O)(=O)O)=CC=CC2=C1 NVVZQXQBYZPMLJ-UHFFFAOYSA-N 0.000 description 2
- 239000011440 grout Substances 0.000 description 2
- 238000004898 kneading Methods 0.000 description 2
- VZCYOOQTPOCHFL-UPHRSURJSA-N maleic acid Chemical compound OC(=O)\C=C/C(O)=O VZCYOOQTPOCHFL-UPHRSURJSA-N 0.000 description 2
- 239000011976 maleic acid Substances 0.000 description 2
- QYYXITIZXRMPSZ-UHFFFAOYSA-N n'-tert-butyl-n'-(3,5-dimethylbenzoyl)-2-ethyl-3-methoxybenzohydrazide Chemical compound CCC1=C(OC)C=CC=C1C(=O)NN(C(C)(C)C)C(=O)C1=CC(C)=CC(C)=C1 QYYXITIZXRMPSZ-UHFFFAOYSA-N 0.000 description 2
- 239000002244 precipitate Substances 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 235000019423 pullulan Nutrition 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 239000010802 sludge Substances 0.000 description 2
- 159000000000 sodium salts Chemical class 0.000 description 2
- 238000001308 synthesis method Methods 0.000 description 2
- CWERGRDVMFNCDR-UHFFFAOYSA-N thioglycolic acid Chemical compound OC(=O)CS CWERGRDVMFNCDR-UHFFFAOYSA-N 0.000 description 2
- LDHQCZJRKDOVOX-UHFFFAOYSA-N trans-crotonic acid Natural products CC=CC(O)=O LDHQCZJRKDOVOX-UHFFFAOYSA-N 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- JAHNSTQSQJOJLO-UHFFFAOYSA-N 2-(3-fluorophenyl)-1h-imidazole Chemical compound FC1=CC=CC(C=2NC=CN=2)=C1 JAHNSTQSQJOJLO-UHFFFAOYSA-N 0.000 description 1
- DKIDEFUBRARXTE-UHFFFAOYSA-N 3-mercaptopropanoic acid Chemical compound OC(=O)CCS DKIDEFUBRARXTE-UHFFFAOYSA-N 0.000 description 1
- FVUCOZOZFMETMT-UHFFFAOYSA-N 3-methylbut-3-en-1-ol;oxirane Chemical compound C1CO1.CC(=C)CCO FVUCOZOZFMETMT-UHFFFAOYSA-N 0.000 description 1
- IAYPIBMASNFSPL-UHFFFAOYSA-N Ethylene oxide Chemical compound C1CO1 IAYPIBMASNFSPL-UHFFFAOYSA-N 0.000 description 1
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 description 1
- 239000002211 L-ascorbic acid Substances 0.000 description 1
- 235000000069 L-ascorbic acid Nutrition 0.000 description 1
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- CERQOIWHTDAKMF-UHFFFAOYSA-M Methacrylate Chemical compound CC(=C)C([O-])=O CERQOIWHTDAKMF-UHFFFAOYSA-M 0.000 description 1
- UFWIBTONFRDIAS-UHFFFAOYSA-N Naphthalene Chemical compound C1=CC=CC2=CC=CC=C21 UFWIBTONFRDIAS-UHFFFAOYSA-N 0.000 description 1
- 239000004721 Polyphenylene oxide Substances 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- 229910052925 anhydrite Inorganic materials 0.000 description 1
- 229940101006 anhydrous sodium sulfite Drugs 0.000 description 1
- 239000002518 antifoaming agent Substances 0.000 description 1
- 229960005070 ascorbic acid Drugs 0.000 description 1
- 230000000740 bleeding effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 125000000484 butyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
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- YDEXUEFDPVHGHE-GGMCWBHBSA-L disodium;(2r)-3-(2-hydroxy-3-methoxyphenyl)-2-[2-methoxy-4-(3-sulfonatopropyl)phenoxy]propane-1-sulfonate Chemical compound [Na+].[Na+].COC1=CC=CC(C[C@H](CS([O-])(=O)=O)OC=2C(=CC(CCCS([O-])(=O)=O)=CC=2)OC)=C1O YDEXUEFDPVHGHE-GGMCWBHBSA-L 0.000 description 1
- 239000010459 dolomite Substances 0.000 description 1
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- 125000001495 ethyl group Chemical group [H]C([H])([H])C([H])([H])* 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000010881 fly ash Substances 0.000 description 1
- 150000002334 glycols Chemical class 0.000 description 1
- 125000003187 heptyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 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
- 230000001771 impaired effect Effects 0.000 description 1
- 239000006028 limestone Substances 0.000 description 1
- FPYJFEHAWHCUMM-UHFFFAOYSA-N maleic anhydride Chemical compound O=C1OC(=O)C=C1 FPYJFEHAWHCUMM-UHFFFAOYSA-N 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 150000007974 melamines Chemical class 0.000 description 1
- HNEGQIOMVPPMNR-NSCUHMNNSA-N mesaconic acid Chemical compound OC(=O)C(/C)=C/C(O)=O HNEGQIOMVPPMNR-NSCUHMNNSA-N 0.000 description 1
- LVHBHZANLOWSRM-UHFFFAOYSA-N methylenebutanedioic acid Natural products OC(=O)CC(=C)C(O)=O LVHBHZANLOWSRM-UHFFFAOYSA-N 0.000 description 1
- HNEGQIOMVPPMNR-UHFFFAOYSA-N methylfumaric acid Natural products OC(=O)C(C)=CC(O)=O HNEGQIOMVPPMNR-UHFFFAOYSA-N 0.000 description 1
- 239000004570 mortar (masonry) Substances 0.000 description 1
- 125000002347 octyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- 230000020477 pH reduction Effects 0.000 description 1
- 125000001147 pentyl group Chemical group C(CCCC)* 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 229920001495 poly(sodium acrylate) polymer Polymers 0.000 description 1
- 238000012643 polycondensation polymerization Methods 0.000 description 1
- 238000006068 polycondensation reaction Methods 0.000 description 1
- 229920000570 polyether Polymers 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
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Landscapes
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
- Soil Conditioners And Soil-Stabilizing Materials (AREA)
- Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
Abstract
Description
本発明は、高炉スラグ微粉末を含有する結合材、混和剤及び水を含有してなる高炉スラグ含有セメントスラリー組成物及びこれを用いたソイルセメントスラリーの調製方法に関する。 The present invention relates to a blast furnace slag-containing cement slurry composition containing a binder containing blast furnace slag fine powder, an admixture and water, and a method for preparing a soil cement slurry using the same.
ソイルセメントスラリーで杭等の硬化体を構築する場合、地盤中にセメントスラリー組成物を注入し、削孔混練機械を用いて原位置で土壌と撹拌混合するのが一般的である。またその際に用いるセメントスラリー組成物の水/結合材の質量比は、該セメントスラリー組成物を圧送するグラウトポンプ等への負荷も考慮し、60%よりも高くすることが一般的である(例えば非特許文献1参照)。しかし、セメントスラリー組成物の水/セメントの質量比を高くすると、得られる硬化体が所望の強度のものとなるようにその注入率を上げざるを得ず、結果として、建設汚泥であるセメントスラリー組成物と土壌との混合物である排出物が増加し、かかる排出物の処理費用やかかる排出物による環境への負荷が増大する。更にセメントスラリー組成物の材料分離抵抗性が低下し、それ自体の品質の安定性に問題を生じる。セメントスラリー組成物の材料分離抵抗性を向上させるため、ベントナイトやセルロース系等の増粘剤を用いて、セメントスラリー組成物の粘性を向上させることも行われているが(例えば特許文献1及び2参照)、これらの従来法では充分な効果が得られない。 When a hardened body such as a pile is constructed with soil cement slurry, it is common to inject the cement slurry composition into the ground and to stir and mix with the soil in situ using a drilling kneading machine. In addition, the mass ratio of the water / binder of the cement slurry composition used at that time is generally higher than 60% in consideration of a load on a grout pump or the like that pumps the cement slurry composition ( For example, refer nonpatent literature 1). However, when the water / cement mass ratio of the cement slurry composition is increased, the injection rate must be increased so that the obtained cured product has a desired strength, and as a result, the cement slurry which is construction sludge. Emissions, which are a mixture of the composition and soil, increase, and the processing costs for such emissions and the environmental burden of such emissions increase. Furthermore, the material separation resistance of the cement slurry composition is lowered, which causes a problem in the stability of its own quality. In order to improve the material separation resistance of the cement slurry composition, the viscosity of the cement slurry composition is also improved using a thickener such as bentonite or cellulose (for example, Patent Documents 1 and 2). These conventional methods cannot obtain a sufficient effect.
セメントスラリー組成物の水/結合材の質量比を低くする一方でその粘性を低減する混和剤として、ナフタレンスルホン酸ホルムアルデヒド高縮合物やメラミンスルホン酸ホルムアルデヒド高縮合物と、ポリアクリル酸ナトリウム等とを併用した分散剤が知られている(例えば特許文献3及び4参照)。しかし、これらの分散剤はセメントに対する分散性が低く、水/結合材の質量比を充分に低くすることができないという問題がある。 As an admixture that lowers the viscosity of the cement slurry composition water / binder while reducing its viscosity, naphthalene sulfonic acid formaldehyde high condensate or melamine sulfonic acid formaldehyde high condensate, sodium polyacrylate, etc. Dispersants used in combination are known (see, for example, Patent Documents 3 and 4). However, these dispersants have low dispersibility with respect to cement, and there is a problem that the mass ratio of water / binder cannot be made sufficiently low.
セメントに対する分散性が高い分散剤としては、メタクリル酸やそのポリエーテルエステル化物を主成分として重合した重合物も知られている(例えば特許文献5参照)。しかし、この分散剤は水/結合材の質量比の低い領域、特に結合材として高炉スラグ微粉末を用いたセメントスラリー組成物において、粘調な沈殿物が発生し易く、これにより配管の閉塞を招いたり、セメントスラリーの均一性が失われ、品質の低下を引き起こしたりするという問題がある。 As a dispersant having high dispersibility with respect to cement, a polymer obtained by polymerizing methacrylic acid or a polyether esterified product thereof as a main component is also known (see, for example, Patent Document 5). However, this dispersant tends to generate viscous precipitates in regions where the water / binder mass ratio is low, particularly in cement slurry compositions using blast furnace slag fine powder as the binder, thereby blocking the piping. There is a problem in that the uniformity of the cement slurry is lost and the quality is deteriorated.
本発明が解決しようとする課題は、地盤改良工事において、土壌単位体積当たりの注入量を抑制するため、水/結合材の質量比を低くした高炉スラグ含有セメントスラリー組成物を用いても、調製したソイルセメントスラリーが良好な施工性を有すると共に得られる硬化体が充分な強度を有するものとなる高炉スラグ含有セメントスラリー組成物及びこれを用いたソイルセメントスラリーの調製方法を提供する処にある。 The problem to be solved by the present invention is to prepare even if using a blast furnace slag-containing cement slurry composition in which the mass ratio of water / binding material is lowered in order to suppress the injection amount per unit volume of soil in ground improvement work. The present invention is to provide a blast furnace slag-containing cement slurry composition in which the obtained soil cement slurry has good workability and the obtained cured body has sufficient strength, and a method for preparing the soil cement slurry using the same.
しかして本発明者らは、前記の課題を解決するべく研究した結果、結合材として特定の成分を特定割合で含有するものを用い、また水/結合材の質量比を特定範囲に調製し、更に結合材に対し特定の混和剤を特定割合で含有する高炉スラグ含有セメントスラリー組成物を用いることが正しく好適であることを見出した。 As a result, the present inventors have studied to solve the above-mentioned problems, and as a result, used a binder containing a specific component in a specific ratio, and prepared a water / binder mass ratio in a specific range. Furthermore, the present inventors have found that it is correctly and suitably used a blast furnace slag-containing cement slurry composition containing a specific admixture in a specific ratio with respect to the binder.
すなわち本発明は、下記の結合材、下記の混和剤及び水を含有してなる高炉スラグ含有セメントスラリー組成物であって、水/結合材の質量比が30〜60%であり、且つ結合材100質量部に対し混和剤を0.01〜3質量部の割合で含有してなることを特徴とする高炉スラグ含有セメントスラリー組成物に係る。また本発明はかかる高炉スラグ含有セメントスラリー組成物を土壌と混合することを特徴とするソイルセメントスラリーの調製方法に係る。 That is, the present invention is a blast furnace slag-containing cement slurry composition containing the following binder, the following admixture and water, wherein the mass ratio of water / binder is 30 to 60%, and the binder. The present invention relates to a blast furnace slag-containing cement slurry composition comprising an admixture in an amount of 0.01 to 3 parts by mass with respect to 100 parts by mass. Moreover, this invention concerns on the preparation method of the soil cement slurry characterized by mixing this blast furnace slag containing cement slurry composition with soil.
結合材:粉末度が2000〜11000cm2/gの高炉スラグ微粉末を30〜75質量%、ポルトランドセメントを25〜70質量%及び石膏を0〜20質量%(合計100質量%)の割合で含有して成るもの。 Binder: 30 to 75% by mass of fine powder of blast furnace slag having a fineness of 2000 to 11000 cm 2 / g, 25 to 70% by mass of Portland cement, and 0 to 20% by mass (total 100% by mass) of gypsum It consists of.
混和剤:下記のA成分及び下記のB成分からなるもの。 Admixture: Composed of the following A component and the following B component.
A成分:下記の水溶性ビニル共重合体(1)及び/又は下記の水溶性ビニル共重合体(2)。 Component A: The following water-soluble vinyl copolymer (1) and / or the following water-soluble vinyl copolymer (2).
水溶性ビニル共重合体(1):分子中に下記の化1から形成された構成単位Lを30〜60モル%及び下記の化2から形成された構成単位Mを70〜40モル%(合計100モル%)の割合で有する質量平均分子量2000〜80000の水溶性ビニル共重合体。 Water-soluble vinyl copolymer (1): 30 to 60 mol% of the structural unit L formed from the following chemical formula 1 and 70 to 40 mol% of the structural unit M formed from the chemical formula 2 below in the molecule (total) A water-soluble vinyl copolymer having a mass average molecular weight of 2000 to 80000 having a ratio of 100 mol%).
水溶性ビニル共重合体(2):分子中に下記の化3から形成された構成単位Pを10〜65モル%及び下記の化4から形成された構成単位Qを35〜90モル%(合計100モル%)の割合で有する質量平均分子量2000〜80000の水溶性ビニル共重合体。 Water-soluble vinyl copolymer (2): 10 to 65 mol% of the structural unit P formed from the following chemical formula 3 and 35 to 90 mol% of the structural unit Q formed from the chemical formula 4 below in the molecule (total) A water-soluble vinyl copolymer having a mass average molecular weight of 2000 to 80000 having a ratio of 100 mol%).
B成分:グルコン酸、グルコン酸塩、メラミンスルホン酸ホルムアルデヒド高縮合物及びメラミンスルホン酸ホルムアルデヒド高縮合物の塩から選ばれる一つ又は二つ以上。 Component B: one or more selected from gluconic acid, gluconate, melamine sulfonic acid formaldehyde high condensate and melamine sulfonic acid formaldehyde high condensate salt.
化1,化2,化3及び化4において、
R1,R3,R4,R7:水素原子又はメチル基
R2,R6:水素原子又は炭素数1〜8のアルキル基
R5:下記の化5又は化6で示される有機基
R8:水素原子、メチル基又は下記の化7で示される有機基
m:1又は2の整数
AO:オキシエチレン基及び/又はオキシプロピレン基
n:5〜100の整数
u:5〜200の整数
X1,X2,Y:水素原子、一価金属、二価金属、アンモニウム又は有機アミン基
In chemical formula 1, chemical formula 2, chemical formula 3 and chemical formula 4,
R 1 , R 3 , R 4 , R 7 : hydrogen atom or methyl group R 2 , R 6 : hydrogen atom or alkyl group having 1 to 8 carbon atoms R 5 : organic group represented by the following chemical formula 5 or chemical formula R 8 : a hydrogen atom, a methyl group, or an organic group represented by the following chemical formula 7 m: an integer of 1 or 2 AO: an oxyethylene group and / or an oxypropylene group n: an integer of 5 to 100 u: an integer of 5 to 200 X 1 , X 2 , Y: hydrogen atom, monovalent metal, divalent metal, ammonium or organic amine group
化6において、
t:1又は2の整数
In Chemical Formula 6,
t: an integer of 1 or 2
化7において、
Z:水素原子、一価金属、二価金属、アンモニウム又は有機アミン基
In Chemical Formula 7,
Z: hydrogen atom, monovalent metal, divalent metal, ammonium or organic amine group
まず本発明に係る高炉スラグ含有セメントスラリー組成物(以下、本発明のスラリー組成物という)について説明する。本発明のスラリー組成物は、結合材、混和剤及び水を含有して成るものである。 First, the blast furnace slag-containing cement slurry composition according to the present invention (hereinafter referred to as the slurry composition of the present invention) will be described. The slurry composition of the present invention comprises a binder, an admixture and water.
本発明のスラリー組成物に供する混和剤は、A成分及びB成分からなるものである。A成分は前記の水溶性ビニル共重合体(1)及び/又は前記の水溶性ビニル共重合体(2)である。 The admixture used for the slurry composition of the present invention is composed of an A component and a B component. The component A is the water-soluble vinyl copolymer (1) and / or the water-soluble vinyl copolymer (2).
水溶性ビニル共重合体(1)の構成単位Lを形成することとなる化1で示される化合物において、化1中のR1は水素原子又はメチル基である。また化1中のR2は水素原子又は炭素数1〜8のアルキル基である。かかる炭素数1〜8のアルキル基としては、メチル基、エチル基、プロピル基、ブチル基、ペンチル基、ヘキシル基、ヘプチル基、オクチル基等が挙げられる。更に化1中のAOはオキシエチレン基及び/又はオキシプロピレン基である。そして化1中のmは1又は2の整数であり、nは5〜100の整数である。 In the compound represented by Chemical Formula 1 that will form the structural unit L of the water-soluble vinyl copolymer (1), R 1 in Chemical Formula 1 is a hydrogen atom or a methyl group. R 2 in Chemical Formula 1 is a hydrogen atom or an alkyl group having 1 to 8 carbon atoms. Examples of the alkyl group having 1 to 8 carbon atoms include methyl group, ethyl group, propyl group, butyl group, pentyl group, hexyl group, heptyl group, octyl group and the like. Further, AO in Chemical Formula 1 is an oxyethylene group and / or an oxypropylene group. In the chemical formula 1, m is an integer of 1 or 2, and n is an integer of 5 to 100.
かかる化1で示される化合物の具体例としては、α−アリル−ω−メトキシ−ポリエチレングリコール、α−アリル−ω−メトキシ−ポリエチレンポリプロピレングリコール、α−アリル−ω−ブトキシ−ポリエチレングリコール、α−アリル−ω−ブトキシ−ポリエチレンポリプロピレングリコール、α−アリル−ω−ヒドロキシ−ポリエチレングリコール、α−アリル−ω−ヒドロキシ−ポリエチレンポリプロピレングリコール、2−メチル−2−プロペン−1−オール・ポリエチレングリコール付加物、2−メチル−2−プロペン−1−オール・ポリプロピレングリコール付加物、2−メチル−2−プロペン−1−オール・ポリエチレンポリプロピレングリコール付加物、3−メチル−3−ブテン−1−オール・ポリエチレングリコール付加物、3−メチル−3−ブテン−1−オール・ポリプロピレングリコール付加物、3−メチル−3−ブテン−1−オール・ポリエチレンポリプロピレングリコール付加物等が挙げられる。尚、これらの化合物において、分子中のオキシエチレン基とオキシプロピレン基はブロック結合でも又はランダム結合でもよい。 Specific examples of the compound represented by Chemical Formula 1 include α-allyl-ω-methoxy-polyethylene glycol, α-allyl-ω-methoxy-polyethylene polypropylene glycol, α-allyl-ω-butoxy-polyethylene glycol, α-allyl. -Ω-butoxy-polyethylene polypropylene glycol, α-allyl-ω-hydroxy-polyethylene glycol, α-allyl-ω-hydroxy-polyethylene polypropylene glycol, 2-methyl-2-propen-1-ol polyethylene glycol adduct, 2 -Methyl-2-propen-1-ol / polypropylene glycol adduct, 2-methyl-2-propen-1-ol / polyethylene polypropylene glycol adduct, 3-methyl-3-buten-1-ol / polyethylene glycol adduct 3-methyl-3-buten-1-ol-polypropylene glycol adducts, 3-methyl-3-buten-1-ol, polyethylene polypropylene glycol adducts. In these compounds, the oxyethylene group and oxypropylene group in the molecule may be block bonds or random bonds.
水溶性ビニル共重合体(1)の構成単位Mを形成することとなる化2で示される化合物において、化2中のR3は水素原子又はメチル基である。また化2中のX1及びX2は、水素原子、一価金属、二価金属、アンモニウム又は有機アミン基である。 In the compound represented by Chemical Formula 2 that will form the structural unit M of the water-soluble vinyl copolymer (1), R 3 in Chemical Formula 2 is a hydrogen atom or a methyl group. X 1 and X 2 in Chemical Formula 2 are a hydrogen atom, a monovalent metal, a divalent metal, ammonium, or an organic amine group.
かかる化2で示される化合物の具体例としては、マレイン酸、フマル酸、シトラコン酸、メサコン酸及びそれらの塩等が挙げられる。 Specific examples of the compound represented by Chemical Formula 2 include maleic acid, fumaric acid, citraconic acid, mesaconic acid, and salts thereof.
水溶性ビニル共重合体(1)は、化1で示される化合物から形成された構成単位Lを30〜60モル%及び化2で示される化合物から形成された構成単位Mを70〜40モル%(合計100モル%)の割合で有する質量平均分子量2000〜80000の水溶性ビニル共重合体である。かかる水溶性ビニル共重合体(1)は、結合材に優れた分散性を付与し、高炉スラグ含有セメントスラリー組成物の粘性を著しく減少させる。水溶性ビニル共重合体(1)は公知の方法で合成できる。これには例えば、特開2012−51737号公報に記載された合成方法が挙げられる。 The water-soluble vinyl copolymer (1) comprises 30 to 60 mol% of the structural unit L formed from the compound represented by Chemical Formula 1 and 70 to 40 mol% of the structural unit M formed from the compound represented by Chemical Formula 2 It is a water-soluble vinyl copolymer having a mass average molecular weight of 2000 to 80000 having a ratio of (total 100 mol%). Such a water-soluble vinyl copolymer (1) imparts excellent dispersibility to the binder and significantly reduces the viscosity of the blast furnace slag-containing cement slurry composition. The water-soluble vinyl copolymer (1) can be synthesized by a known method. This includes, for example, the synthesis method described in JP2012-51737A.
水溶性ビニル共重合体(2)の構成単位Pを形成することとなる化3で示される化合物において、化3中のR4は水素原子又はメチル基である。また化3中のR6は水素原子又は炭素数1〜8のアルキル基である。これらは、化1中のR2について前記したことと同じである。更に化3中のAOはオキシエチレン基及び/又はオキシプロピレン基である。更にまた化3中のuは5〜200の整数である。そして化3中のR5は前記の化5又は化6で示される有機基であり、化6中のtは1又は2の整数である。 In the compound represented by Chemical formula 3 that will form the structural unit P of the water-soluble vinyl copolymer (2), R 4 in Chemical formula 3 is a hydrogen atom or a methyl group. R 6 in Chemical Formula 3 is a hydrogen atom or an alkyl group having 1 to 8 carbon atoms. These are the same as described above for R 2 in Chemical Formula 1. Further, AO in Chemical Formula 3 is an oxyethylene group and / or an oxypropylene group. Furthermore, u in Chemical Formula 3 is an integer of 5 to 200. R 5 in Chemical Formula 3 is an organic group represented by Chemical Formula 5 or Chemical Formula 6 above, and t in Chemical Formula 6 is an integer of 1 or 2.
かかる化3で示される化合物の具体例としては、メトキシポリエチレングリコールモノ(メタ)アクリレート、メトキシポリプロピレングリコールモノ(メタ)アクリレート、メトキシポリエチレンポリプロピレングリコールモノ(メタ)アクリレート、エトキシポリエチレングリコールモノ(メタ)アクリレート、エトキシポリプロピレングリコールモノ(メタ)アクリレート、エトキシポリエチレンポリプロピレングリコールモノ(メタ)アクリレート、ブトキシポリエチレングリコールモノ(メタ)アクリレート、ブトキシポリプロピレングリコールモノ(メタ)アクリレート、ブトキシポリエチレンポリプロピレングリコールモノ(メタ)アクリレート、2−メチル−2−プロペン−1−オール・ポリエチレングリコール付加物、2−メチル−2−プロペン−1−オール・ポリプロピレングリコール付加物、2−メチル−2−プロペン−1−オール・ポリエチレンポリプロピレングリコール付加物、3−メチル−3−ブテン−1−オール・ポリエチレングリコール付加物、3−メチル−3−ブテン−1−オール・ポリプロピレングリコール付加物、3−メチル−3−ブテン−1−オール・ポリエチレンポリプロピレングリコール付加物などが挙げられる。尚、これらの化合物において、分子中のオキシエチレン基とオキシプロピレン基はブロック結合でも又はランダム結合でもよい。 Specific examples of the compound represented by Chemical Formula 3 include methoxypolyethylene glycol mono (meth) acrylate, methoxypolypropylene glycol mono (meth) acrylate, methoxypolyethylenepolypropylene glycol mono (meth) acrylate, ethoxypolyethyleneglycol mono (meth) acrylate, Ethoxy polypropylene glycol mono (meth) acrylate, ethoxy polyethylene polypropylene glycol mono (meth) acrylate, butoxy polyethylene glycol mono (meth) acrylate, butoxy polypropylene glycol mono (meth) acrylate, butoxy polyethylene polypropylene glycol mono (meth) acrylate, 2-methyl 2-propen-1-ol polyethylene glycol adduct, 2 Methyl-2-propen-1-ol / polypropylene glycol adduct, 2-methyl-2-propen-1-ol / polyethylene polypropylene glycol adduct, 3-methyl-3-buten-1-ol / polyethylene glycol adduct, Examples include 3-methyl-3-buten-1-ol / polypropylene glycol adduct and 3-methyl-3-buten-1-ol / polyethylene polypropylene glycol adduct. In these compounds, the oxyethylene group and oxypropylene group in the molecule may be block bonds or random bonds.
水溶性ビニル共重合体(2)の構成単位Qを形成することとなる化4で示される化合物において、化4中のR7は水素原子又はメチル基である。また化4中のYは、水素原子、一価金属、二価金属、アンモニウム又は有機アミン基である。更に化4中のR8は水素原子、メチル基又は前記の化7で示される有機基であり、化7中のZは、水素原子、一価金属、二価金属、アンモニウム又は有機アミン基である。 In the compound represented by Chemical formula 4 that will form the structural unit Q of the water-soluble vinyl copolymer (2), R 7 in Chemical formula 4 is a hydrogen atom or a methyl group. Y in Chemical Formula 4 is a hydrogen atom, a monovalent metal, a divalent metal, ammonium or an organic amine group. Further, R 8 in Chemical Formula 4 is a hydrogen atom, a methyl group, or an organic group represented by Chemical Formula 7, and Z in Chemical Formula 7 is a hydrogen atom, a monovalent metal, a divalent metal, ammonium, or an organic amine group. is there.
かかる化4で示される化合物の具体例としては、アクリル酸、メタクリル酸、イタコン酸、クロトン酸及びそれらの塩等が挙げられる。 Specific examples of the compound represented by Chemical Formula 4 include acrylic acid, methacrylic acid, itaconic acid, crotonic acid, and salts thereof.
水溶性ビニル共重合体(2)は、化3で示される化合物から形成された構成単位Pを10〜65モル%及び化4で示される化合物から形成された構成単位Qを35〜90モル%(合計100モル%)の割合で有する質量平均分子量2000〜80000の水溶性ビニル共重合体である。かかる水溶性ビニル共重合体(2)は、結合材に優れた分散性を付与し、高炉スラグ含有セメントスラリー組成物の粘性を著しく減少させる。水溶性ビニル共重合体(2)は公知の方法で合成できる。これには例えば、特開2005−15338号公報に記載された合成方法が挙げられる。 The water-soluble vinyl copolymer (2) comprises 10 to 65 mol% of the structural unit P formed from the compound represented by Chemical Formula 3 and 35 to 90 mol% of the structural unit Q formed from the compound represented by Chemical Formula 4 It is a water-soluble vinyl copolymer having a mass average molecular weight of 2000 to 80000 having a ratio of (total 100 mol%). Such a water-soluble vinyl copolymer (2) imparts excellent dispersibility to the binder and significantly reduces the viscosity of the blast furnace slag-containing cement slurry composition. The water-soluble vinyl copolymer (2) can be synthesized by a known method. This includes, for example, the synthesis method described in JP-A No. 2005-15338.
本発明のスラリー組成物に供する混和剤は以上説明したようなA成分とB成分とからなるものである。B成分は、グルコン酸、グルコン酸塩、メラミンスルホン酸ホルムアルデヒド高縮合物及びメラミンスルホン酸ホルムアルデヒド高縮合物の塩から選ばれる一つ又は二つ以上である。なかでも、B成分としては、質量平均分子量2000〜100000のメラミンスルホン酸ホルムアルデヒド高縮合物及び/又はその塩が好ましい。かかるメラミンスルホン酸ホルムアルデヒド高縮合物及び/又はその塩は公知の方法で合成することができる。これには例えば、メラミンにホルムアルデヒドを縮合させ、重亜硫酸塩を添加してスルホメチル化した後、縮重合させる方法が挙げられる。 The admixture used for the slurry composition of the present invention comprises the A component and the B component as described above. Component B is one or more selected from gluconic acid, gluconate, melamine sulfonate formaldehyde high condensate and melamine sulfonate formaldehyde high condensate salt. Especially, as B component, the melamine sulfonic acid formaldehyde highly condensed product of mass mean molecular weight 2000-100000 and / or its salt are preferable. Such a highly condensed melamine sulfonate formaldehyde and / or salt thereof can be synthesized by a known method. This includes, for example, a method in which formaldehyde is condensed with melamine, bisulfite is added to sulfomethylate, and then condensation polymerization is performed.
本発明のスラリー組成物に供する混和剤は、結合材100質量部に対し0.01〜3質量部の割合となるよう含有させるが、B成分を該結合材100質量部に対して1質量部以下となるよう含有させることが好ましい。混和剤の使用量がかかる割合を外れると、所望する粘性低減効果や沈殿の抑制効果が不足したり、調製したソイルセメントスラリーから得られる硬化体の強度発現性が低下したりする。 The admixture used for the slurry composition of the present invention contains 0.01 to 3 parts by mass with respect to 100 parts by mass of the binder, but the B component is 1 part by mass with respect to 100 parts by mass of the binder. It is preferable to contain so that it may become the following. If the amount of the admixture used is outside this ratio, the desired viscosity reducing effect and precipitation suppressing effect are insufficient, or the strength development of the cured product obtained from the prepared soil cement slurry is reduced.
本発明のスラリー組成物に供する結合材は、高炉スラグ微粉末を30〜75質量%、ポルトランドセメントを25〜70質量%及び石膏を0〜20質量%(合計100質量%)の割合で含有して成るものであるが、好ましくは高炉スラグ微粉末を32〜67質量%、ポルトランドセメントを30〜65質量%及び石膏を3〜15質量%(合計100質量%)の割合で含有して成るものである。 The binder used for the slurry composition of the present invention contains 30 to 75% by mass of blast furnace slag fine powder, 25 to 70% by mass of Portland cement, and 0 to 20% by mass (total 100% by mass) of gypsum. Preferably, it comprises 32 to 67% by mass of blast furnace slag fine powder, 30 to 65% by mass of Portland cement, and 3 to 15% by mass (total 100% by mass) of gypsum. It is.
本発明のスラリー組成物において、結合材に用いる高炉スラグ微粉末は、粉末度が2000〜11000cm2/gのものであるが、好ましくは粉末度が3000〜7000cm2/gのものである。尚、本発明において粉末度は、JIS−R5201で規定される比表面積試験に準拠して測定した比表面積で表したものである。 In the slurry composition of the present invention, the blast furnace slag fine powder used for the binder has a fineness of 2000 to 11000 cm 2 / g, preferably a fineness of 3000 to 7000 cm 2 / g. In the present invention, the fineness is expressed by a specific surface area measured in accordance with a specific surface area test defined by JIS-R5201.
本発明のスラリー組成物において、結合材に用いるポルトランドセメントとしては、普通ポルトランドセメント、中庸熱ポルトランドセメント、低熱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、耐硫酸塩ポルトランドセメント等が挙げられる。 Examples of the Portland cement used as the binder in the slurry composition of the present invention include ordinary Portland cement, moderately heated Portland cement, low heat Portland cement, early-strength Portland cement, ultra-early strong Portland cement, sulfate-resistant Portland cement, and the like. .
本発明のスラリー組成物において、結合材に用いる石膏としては、無水石膏、半水石膏、二水石膏等が挙げられるが、なかでも無水石膏が好ましい。無水石膏としては、天然無水石膏や副産無水石膏等が挙げられるが、いずれにおいても90質量%以上の純度のものが好ましい。無水石膏の粉末度は、2500〜8000cm2/gのものが好ましく、3000〜6500cm2/gのものがより好ましい。 In the slurry composition of the present invention, examples of the gypsum used for the binder include anhydrous gypsum, hemihydrate gypsum, dihydrate gypsum, etc. Among them, anhydrous gypsum is preferable. Examples of anhydrous gypsum include natural anhydrous gypsum and by-product anhydrous gypsum, and any of them preferably has a purity of 90% by mass or more. Fineness of anhydrite is preferably one of 2500~8000cm 2 / g, it is more preferred 3000~6500cm 2 / g.
本発明のスラリー組成物において、水/結合材の質量比は30〜60%であるが、好ましくは35〜50%である。水/結合材の質量比が30〜60%を外れると、そのようなセメントスラリー組成物はグラウトポンプでの圧送が難しくなり、結果として得られる硬化体に所望の強度を発現させるために注入率を上げざるを得なくなって、建設汚泥である土壌とセメントスラリー組成物の混合物である排出物の排出量が増加し、それらの処理費用やそれらによる環境への負荷が増大するばかりでなく、処理に関する工数が増加して施工性が低下する。 In the slurry composition of the present invention, the water / binder mass ratio is 30-60%, preferably 35-50%. If the water / binder mass ratio is outside of 30-60%, such cement slurry compositions will be difficult to pump with a grout pump and the resulting hardened body will have the desired injection rate to achieve the desired strength. As a result, the amount of waste, which is a mixture of soil and cement slurry composition, which is a construction sludge increases, and the treatment cost and the environmental impact of the waste increase. The man-hour concerning increases and the workability decreases.
本発明のスラリー組成物は、公知の方法で調製することができる。例えば、結合材と混和剤及び水の各所定量をミキサーに投入して練り混ぜる方法で調製することができる。混和剤は、A成分とB成分を別々に添加しても又は同時に添加してもよいが、先にB成分を投入して混合し、結合材に吸着させた後に、A成分を投入する方法が好ましい。 The slurry composition of the present invention can be prepared by a known method. For example, it can be prepared by a method in which a predetermined amount of each of the binder, admixture and water is put into a mixer and kneaded. The admixture may be added separately or simultaneously with the A component and the B component, but the method of adding the A component after the B component is first added and mixed and adsorbed on the binder. Is preferred.
本発明のスラリー組成物は、本発明の効果を損なわない範囲内で、必要に応じてベントナイト、石灰石微粉末、フライアッシュ、ドロマイト微粉末、消泡剤、凝結遅延剤、硬化促進剤、繊維等を併用することもできる。 The slurry composition of the present invention is bentonite, limestone fine powder, fly ash, dolomite fine powder, antifoaming agent, setting retarder, curing accelerator, fiber, etc., as long as the effects of the present invention are not impaired. Can also be used together.
本発明に係るソイルセメントスラリーの調製方法は、本発明のスラリー組成物を、原位置土壌と混合する方法である。本発明のスラリー組成物の組成や原位置土壌1m3当たりたりの本発明のスラリー組成物の注入量は、ソイルセメントスラリーに要求される流動性、得られる硬化体に要求される強度、混合される原位置土壌の性状に応じて、適宜選択することができる。また本発明のスラリー組成物と原位置土壌との混合方法は特に限定されるものではないが、混合方法としては、本発明のスラリー組成物を直接地盤に注入しながら混合するCDM(Cement Deep Mixing)工法、高圧噴射撹拌工法などが挙げられる。 The method for preparing a soil cement slurry according to the present invention is a method of mixing the slurry composition of the present invention with in-situ soil. The composition of the slurry composition of the present invention and the injection amount of the slurry composition of the present invention per 1 m 3 of in- situ soil are mixed with the fluidity required for the soil cement slurry, the strength required for the resulting hardened body. Depending on the properties of the in-situ soil, it can be appropriately selected. In addition, the mixing method of the slurry composition of the present invention and the in-situ soil is not particularly limited. However, as the mixing method, CDM (Cement Deep Mixing) in which the slurry composition of the present invention is mixed while being directly injected into the ground. ) Method, high-pressure jet stirring method, etc.
本発明によると、地盤改良工事において、土壌単位体積当たりの注入量を抑制するために、水/結合材の質量比を低くした高炉スラグ含有セメントスラリー組成物を用いても、調製したソイルセメントスラリーが良好な施工性を有すると共に得られる硬化体が充分な強度を有するものになるという効果がある。 According to the present invention, a soil cement slurry prepared by using a blast furnace slag-containing cement slurry composition having a low water / binder mass ratio in order to suppress the injection amount per unit volume of soil in ground improvement work. Has the effect that the cured product obtained has good workability and has sufficient strength.
以下、本発明の構成及び効果をより具体的にするため、実施例等を挙げるが、本発明が該実施例に限定されるというものではない。尚、以下の実施例等において、別に記載しない限り、%は質量%を、また部は質量部を意味する。 Hereinafter, in order to make the configuration and effects of the present invention more specific, examples and the like will be described. However, the present invention is not limited to the examples. In the following examples and the like, unless otherwise indicated,% means mass% and part means mass part.
試験区分1(混和剤の調製)
・A成分の水溶性ビニル共重合体(1)に相当する水溶性ビニル共重合体(da−1)及び(da−2)の合成
α−アリル−ω−メトキシ−ポリ(33モル)エチレングリコール1512g(1.0モル)及び無水マレイン酸147g(1.5モル)を反応容器に仕込み、反応容器内の雰囲気を窒素置換した後、徐々に加温して撹拌しながら均一に溶解した。反応系の温度を温水浴にて80℃に保ち、アゾビスイソブチロニトリル10gを投入してラジカル重合反応を開始した。2時間経過後、更にアゾビスイソブチロニトリル5gを投入し、ラジカル重合反応を6時間継続して行なった。得られた共重合体に水を加えて、その後、30%水酸化ナトリウム水溶液200gを投入して中和し、水溶性ビニル共重合体(da−1)の40%水溶液を得た。この水溶性ビニル共重合体(da−1)を分析したところ、質量平均分子量71000(GPC法、プルラン換算、以下同じ)の水溶性ビニル共重合体であった。同様にして、水溶性ビニル共重合体(da−2)を合成した。
Test Category 1 (Preparation of admixture)
Synthesis of water-soluble vinyl copolymers (da-1) and (da-2) corresponding to the water-soluble vinyl copolymer (1) of component A α-allyl-ω-methoxy-poly (33 mol) ethylene glycol After 1512 g (1.0 mol) and 147 g (1.5 mol) of maleic anhydride were charged into the reaction vessel and the atmosphere in the reaction vessel was replaced with nitrogen, the mixture was gradually heated and dissolved uniformly with stirring. The temperature of the reaction system was kept at 80 ° C. in a warm water bath, and 10 g of azobisisobutyronitrile was added to initiate radical polymerization reaction. After 2 hours, 5 g of azobisisobutyronitrile was further added, and the radical polymerization reaction was continued for 6 hours. Water was added to the obtained copolymer, and then neutralized by adding 200 g of a 30% aqueous sodium hydroxide solution to obtain a 40% aqueous solution of the water-soluble vinyl copolymer (da-1). When this water-soluble vinyl copolymer (da-1) was analyzed, it was a water-soluble vinyl copolymer having a mass average molecular weight of 71000 (GPC method, pullulan conversion, the same applies hereinafter). Similarly, a water-soluble vinyl copolymer (da-2) was synthesized.
・A成分の水溶性ビニル共重合体(1)に相当する水溶性ビニル共重合体(da−3)の合成
水2520g、2−メチル−2−プロペン−1−オールのエチレンオキシド45モル及びプロピレンオキシド8モル付加体2516g(1.0モル)及びフマル酸116g(1.0モル)を反応容器に仕込み、反応容器内の雰囲気を窒素置換した後、徐々に加温して撹拌しながら均一に溶解した。反応系の温度を温水浴にて80℃に保ち、過硫酸ナトリウムの20%水溶液130gを投入してラジカル重合反応を開始した。2時間経過後、更に過硫酸ナトリウム20%水溶液65gを投入し、ラジカル重合反応を6時間継続して行なった。得られた共重合体に水を加え、その後、30%水酸化ナトリウム水溶液を200g(1.5モル)投入して中和し、水溶性ビニル共重合体(da−3)の40%水溶液を得た。この水溶性ビニル共重合体(da−3)を分析したところ、質量平均分子量21000の水溶性ビニル共重合体であった。
Synthesis of water-soluble vinyl copolymer (da-3) corresponding to water-soluble vinyl copolymer (1) of component A 2520 g of water, 45 mol of ethylene oxide of 2-methyl-2-propen-1-ol and propylene oxide After charging 2516 g (1.0 mol) of 8-mol adduct and 116 g (1.0 mol) of fumaric acid into the reaction vessel, the atmosphere in the reaction vessel was replaced with nitrogen, and then gradually heated and dissolved with stirring. did. The temperature of the reaction system was kept at 80 ° C. in a warm water bath, and 130 g of a 20% aqueous solution of sodium persulfate was added to initiate radical polymerization reaction. After 2 hours, 65 g of a 20% aqueous solution of sodium persulfate was added, and the radical polymerization reaction was continued for 6 hours. Water was added to the obtained copolymer, and then neutralized by adding 200 g (1.5 mol) of a 30% aqueous sodium hydroxide solution to obtain a 40% aqueous solution of the water-soluble vinyl copolymer (da-3). Obtained. When this water-soluble vinyl copolymer (da-3) was analyzed, it was a water-soluble vinyl copolymer having a mass average molecular weight of 21,000.
・A成分の水溶性ビニル共重合体(2)に相当する水溶性ビニル共重合体(da−4)及び(da−5)の合成
水2520g、メトキシポリ(45モル)エチレングリコールモノメタクリレート2080g(1.0モル)、メタクリル酸387g(4.5モル)、30%水酸化ナトリウム水溶液400g及び3−メルカプトプロピオン酸35gを反応容器に仕込み、反応容器内の雰囲気を窒素置換した後、撹拌しながら徐々に加温した。反応系の温度を温水浴にて60℃に保ち、過硫酸ナトリウムの20%水溶液200gを投入してラジカル重合反応を開始した。2時間経過後、更に過硫酸ナトリウムの20%水溶液50gを投入し、ラジカル重合反応を6時間継続して行なった。得られた共重合物に水を加え、水溶性ビニル共重合体(da−4)の40%水溶液を得た。この水溶性ビニル共重合体(da−4)を分析したところ、質量平均分子量28000の水溶性ビニル共重合体であった。同様にして、水溶性ビニル共重合体(da−5)を合成した。
Synthesis of water-soluble vinyl copolymers (da-4) and (da-5) corresponding to the water-soluble vinyl copolymer (2) of component A 2520 g water, 2080 g methoxypoly (45 mol) ethylene glycol monomethacrylate (1 0.0 mol), 387 g (4.5 mol) of methacrylic acid, 400 g of 30% aqueous sodium hydroxide solution and 35 g of 3-mercaptopropionic acid were charged into the reaction vessel, the atmosphere in the reaction vessel was replaced with nitrogen, and then gradually stirred. Warmed to. The temperature of the reaction system was kept at 60 ° C. in a warm water bath, and 200 g of a 20% aqueous solution of sodium persulfate was added to initiate radical polymerization reaction. After 2 hours, 50 g of a 20% aqueous solution of sodium persulfate was further added, and the radical polymerization reaction was continued for 6 hours. Water was added to the obtained copolymer to obtain a 40% aqueous solution of a water-soluble vinyl copolymer (da-4). When this water-soluble vinyl copolymer (da-4) was analyzed, it was a water-soluble vinyl copolymer having a mass average molecular weight of 28,000. Similarly, a water-soluble vinyl copolymer (da-5) was synthesized.
・A成分の水溶性ビニル共重合体(2)に相当する水溶性ビニル共重合体(da−6)の合成
水990g及び3−メチル−3−ブテン−1オールのエチレンオキシド80モル付加体3606g(1.0モル)を反応容器に仕込み、反応容器内の雰囲気を窒素置換した後、撹拌しながら徐々に加温した。反応系の温度を温水浴にて70℃に保ち、温度を安定させた。その後、アクリル酸144g(2.0モル)を3時間かけて滴下すると共に、同時にチオグリコール酸12g及びL−アスコルビン酸8gを水500gに溶解した水溶液及び5%過酸化水素水170gをそれぞれ3時間かけて滴下し、ラジカル重合反応を開始した。滴下終了後1時間経過後、得られた共重合物に水を加え、その後、30%水酸化ナトリウム水溶液200gを投入して中和し、水溶性ビニル共重合体(da−6)の40%水溶液を得た。この水溶性ビニル共重合体(da−6)を分析したところ、質量平均分子量32000の水溶性ビニル共重合体であった。以上で合成した水溶性ビニル共重合体の内容を表1にまとめて示した。
-Synthesis of water-soluble vinyl copolymer (da-6) corresponding to water-soluble vinyl copolymer (2) of component A 990 g of water and 3606 g of 3-methyl-3-buten-1ol ethylene oxide 80 mol adduct ( 1.0 mol) was charged into a reaction vessel, and the atmosphere in the reaction vessel was replaced with nitrogen, and then gradually heated with stirring. The temperature of the reaction system was kept at 70 ° C. with a warm water bath to stabilize the temperature. Thereafter, 144 g (2.0 mol) of acrylic acid was added dropwise over 3 hours, and at the same time, an aqueous solution in which 12 g of thioglycolic acid and 8 g of L-ascorbic acid were dissolved in 500 g of water and 170 g of 5% hydrogen peroxide solution were respectively added for 3 hours. The solution was added dropwise to initiate radical polymerization reaction. One hour after the completion of dropping, water was added to the obtained copolymer, and then neutralized by adding 200 g of a 30% aqueous sodium hydroxide solution to obtain 40% of the water-soluble vinyl copolymer (da-6). An aqueous solution was obtained. When this water-soluble vinyl copolymer (da-6) was analyzed, it was a water-soluble vinyl copolymer having a mass average molecular weight of 32,000. The contents of the water-soluble vinyl copolymer synthesized above are summarized in Table 1.
表1において、
質量平均分子量:GPC法、プルラン換算
L―1:α−アリル−ω−メトキシ−ポリ(33モル)エチレングリコールから形成された構成単位
L―2:α−アリル−ω−ブトキシ−ポリ(80モル)エチレンポリ(9モル)プロピレングリコールから形成された構成単位
L―3:2−メチル−2−プロペン−1−オール・ポリ(45モル)エチレンポリ(8モル)プロピレングリコール付加物から形成された構成単位
M―1:マレイン酸から形成された構成単位
M―2:シトラコン酸から形成された構成単位
M―3:フマル酸から形成された構成単位
P―1:メトキシポリ(45モル)エチレングリコールモノメタクリレートから形成された構成単位
P―2:ブトキシポリ(22モル)エチレングリコールモノメタクリレートから形成された構成単位
P―3:3−メチル−3−ブテン−1−オール・ポリ(80モル)エチレングリコール付加物から形成された構成単位
Q−1:メタクリル酸から形成された構成単位
Q−2:クロトン酸から形成された構成単位
Q−3:アクリル酸から形成された構成単位
In Table 1,
Mass average molecular weight: GPC method, pullulan conversion L-1: α-allyl-ω-methoxy-poly (33 mol) Structural unit formed from ethylene glycol L-2: α-allyl-ω-butoxy-poly (80 mol) ) Structural units formed from ethylene poly (9 mol) propylene glycol L-3: formed from 2-methyl-2-propen-1-ol poly (45 mol) ethylene poly (8 mol) propylene glycol adduct Structural unit M-1: Structural unit formed from maleic acid M-2: Structural unit formed from citraconic acid M-3: Structural unit formed from fumaric acid P-1: Methoxypoly (45 mol) ethylene glycol mono Structural units formed from methacrylate P-2: formed from butoxypoly (22 mol) ethylene glycol monomethacrylate Structural unit P-3: Structural unit formed from 3-methyl-3-buten-1-ol poly (80 mol) ethylene glycol adduct Q-1: Structural unit formed from methacrylic acid Q-2: Structural unit formed from crotonic acid Q-3: Structural unit formed from acrylic acid
・メラミンスルホン酸ホルムアルデヒド高縮合物の塩(db−1)の合成
水65g、メラミン126g(1.0モル)、37%ホルマリン325g(4モル)及び30%水酸化ナトリウム水溶液5.0gを反応容器に仕込み、反応容器内の雰囲気を窒素置換した後、撹拌しながら徐々に加温した。反応系の温度を温水浴にて75℃に保ち、無水亜硫酸ナトリウム50gを加え、スルホン酸化を行い、3時間熟成した。その後、水650g及び硫酸8gを加えて酸性にした後、70℃で重縮合反応を3時間継続して行なった。得られた縮合物に水を加え、その後、30%水酸化ナトリウム水溶液17gを投入して中和し、メラミンスルホン酸ホルムアルデヒド高縮合物の塩(db−1)の20%水溶液を得た。このメラミンスルホン酸ホルムアルデヒド高縮合物の塩を分析したところ、質量平均分子量27000の縮合物であった。
Synthesis of salt of melamine sulfonic acid formaldehyde high condensate (db-1) 65 g of water, 126 g (1.0 mol) of melamine, 325 g (4 mol) of 37% formalin and 5.0 g of 30% sodium hydroxide aqueous solution The atmosphere in the reaction vessel was purged with nitrogen, and then gradually heated with stirring. The temperature of the reaction system was kept at 75 ° C. in a warm water bath, 50 g of anhydrous sodium sulfite was added, sulfonation was performed, and the mixture was aged for 3 hours. Thereafter, 650 g of water and 8 g of sulfuric acid were added for acidification, and the polycondensation reaction was continued at 70 ° C. for 3 hours. Water was added to the obtained condensate, and then neutralized by adding 17 g of a 30% aqueous sodium hydroxide solution to obtain a 20% aqueous solution of a salt of melamine sulfonic acid formaldehyde highly condensate (db-1). When the salt of this melamine sulfonic acid formaldehyde highly condensed product was analyzed, it was a condensed product having a mass average molecular weight of 27,000.
試験区分2(結合材の調製)
表2に記載の調合条件で、高炉スラグ微粉末、ポルトランドセメント及び石膏を混合して、結合材(S―1〜S―16)を調製した。
Test category 2 (Preparation of binder)
Under the mixing conditions shown in Table 2, blast furnace slag fine powder, Portland cement and gypsum were mixed to prepare binders (S-1 to S-16).
表2において、
sg−1:粉末度が4100cm2/gの高炉スラグ微粉末
sg−2:粉末度が5900cm2/gの高炉スラグ微粉末
sg−3:粉末度が2500cm2/gの高炉スラグ微粉末
sg−4:粉末度が8000cm2/gの高炉スラグ微粉末
sg−5:粉末度が10300cm2/gの高炉スラグ微粉末
N:普通ポルトランドセメント
H:早強ポルトランドセメント
gp−1:粉末度が3890cm2/gの無水石膏
gp−2:粉末度が4020cm2/gの半水石膏
gp−3:粉末度が3510cm2/gの二水石膏
In Table 2,
sg-1: Fine powder of blast furnace slag with fineness of 4100 cm 2 / g sg-2: Fine powder of blast furnace slag with fineness of 5900 cm 2 / g sg-3: Fine powder of blast furnace slag with fineness of 2500 cm 2 / g sg- 4: Fine powder of blast furnace slag having a fineness of 8000 cm 2 / g sg-5: Fine powder of blast furnace slag having a fineness of 10300 cm 2 / g N: Normal Portland cement H: Early strength Portland cement gp-1: Fineness of 3890 cm 2 / G anhydrous gypsum gp-2: hemihydrate gypsum with a fineness of 4020 cm 2 / g gp-3: dihydrate gypsum with a fineness of 3510 cm 2 / g
試験区分3(高炉スラグ含有セメントスラリー組成物の調製及び評価)
・高炉スラグ含有セメントスラリー組成物の調製(実施例1〜31及び比較例1〜17)
表3及び表4に記載の配合条件で、ホバートミキサーに、表2に記載の結合材(S―1〜S−16)、練り混ぜ水及び表1に記載の混和剤等を所定量投入して練り混ぜ、表3に記載した実施例1〜31の高炉スラグ含有セメントスラリー組成物(SL―1〜SL―31)及び表4に記載した比較例1〜17の高炉スラグ含有セメントスラリー組成物(RSL―1〜RSL―17)を調製した。
Test category 3 (Preparation and evaluation of cement slurry composition containing blast furnace slag)
-Preparation of blast furnace slag-containing cement slurry composition (Examples 1-31 and Comparative Examples 1-17)
Under the blending conditions described in Table 3 and Table 4, a predetermined amount of the binders (S-1 to S-16) described in Table 2, kneading water, the admixture described in Table 1, and the like are added to the Hobart mixer. The blast furnace slag-containing cement slurry compositions (SL-1 to SL-31) of Examples 1-31 described in Table 3 and the blast furnace slag-containing cement slurry compositions of Comparative Examples 1-17 described in Table 4 (RSL-1 to RSL-17) were prepared.
表4において、
dar−1:リグニンスルホン酸ナトリウム(日本製紙社製の商品名サンエキス252)
dar−2:ナフタレンスルホン酸ホルムアルデヒド高縮合物ナトリウム塩(花王社製の商品名マイティ150)
dar−3:メラミンスルホン酸ホルムアルデヒド高縮合物ナトリウム塩(試験区分2で合成したdb−1)
dar−4:グルコン酸ナトリウム(試薬)
db−2:da−1/グルコン酸ナトリウム(試薬)=1/1(質量比)の混合物
da−3:グルコン酸ナトリウム(試薬)
以上はいずれも20%水溶液として使用した。
In Table 4,
dar-1: sodium lignin sulfonate (trade name Sun Extract 252 manufactured by Nippon Paper Industries Co., Ltd.)
dar-2: Naphthalenesulfonic acid formaldehyde high condensate sodium salt (trade name Mighty 150, manufactured by Kao Corporation)
dar-3: Melamine sulfonic acid formaldehyde high condensate sodium salt (db-1 synthesized in test category 2)
dar-4: Sodium gluconate (reagent)
db-2: mixture of da-1 / sodium gluconate (reagent) = 1/1 (mass ratio) da-3: sodium gluconate (reagent)
The above was used as a 20% aqueous solution.
・高炉スラグ含有セメントスラリー組成物の評価
高炉スラグ含有セメントスラリー組成物の調製直後、30分静置後及び60分静置後のものについて、下記に示す方法でPロートの流下時間を測定し、粘性を評価した。また同様に下記に示す方法で高炉スラグ含有セメントスラリー組成物の沈殿率を求め、沈殿防止性を評価した。結果を表5及び表6にまとめて示した。
・ Evaluation of blast furnace slag-containing cement slurry composition Immediately after the preparation of the blast furnace slag-containing cement slurry composition, after being left for 30 minutes and after being left for 60 minutes, the flow time of the P funnel is measured by the method shown below, Viscosity was evaluated. Moreover, the precipitation rate of the blast furnace slag containing cement slurry composition was similarly calculated | required by the method shown below, and precipitation prevention property was evaluated. The results are summarized in Tables 5 and 6.
・Pロートによる粘性評価
土木学会コンクリート標準示方書「プレパックドコンクリートの注入モルタルの流動性試験方法(P漏斗による方法)」(JSCE−F−521−1999)に準じて、Pロートの流下時間(秒)を測定し、粘性を評価した。
・ Viscosity evaluation by P funnel According to Japan Society of Civil Engineers Concrete Standard Specification “Pre-packed concrete fluidity test method for mortar (method using P funnel)” (JSCE-F-521-1999) Seconds) and the viscosity was evaluated.
・沈殿率の評価
土木学会コンクリート標準示方書JSCE−F−532−1994に使用されるポリエチレン袋を用いて、これに充填した高炉スラグ含有セメントスラリー組成物の底部に観測される粘調な沈殿物の容積率を測定し、沈殿率(容積%)を求め、沈殿防止性を評価した。
・ Evaluation of sedimentation rate Viscous sediments observed at the bottom of cement slurry composition containing blast furnace slag filled with polyethylene bags used in JSCE-F-532-1994 The volume fraction was measured to determine the precipitation rate (% by volume), and the anti-precipitation property was evaluated.
表5及び表6において、
・粘性の評価:60分静置後のものについてのPロートの流下時間(秒)から下記の基準で評価した。
◎:〜14.9秒
○:15.0〜19.9秒
△:20.0〜24.9秒
×:25.0秒〜
・沈殿防止評価:60分静置後のものについての沈殿率(容積%)から下記の基準で評価した。
◎:0.0〜 3.0%
○:3.0〜 5.9%
△:6.0〜11.9%
×:12.0%〜
*1:沈殿は少量であるが、上層にブリーディング水が多い。
*2:粘性が高すぎて測定できなかった。
In Table 5 and Table 6,
Viscosity evaluation: Evaluation was made according to the following criteria from the flow time (seconds) of the P funnel after 60 minutes of standing.
A: to 14.9 seconds ○: 15.0 to 19.9 seconds Δ: 20.0 to 24.9 seconds ×: 25.0 seconds to
-Precipitation prevention evaluation: It evaluated by the following reference | standard from the precipitation rate (volume%) about the thing after 60 minutes standing.
A: 0.0-3.0%
○: 3.0 to 5.9%
Δ: 6.0 to 11.9%
×: 12.0% ~
* 1: Precipitation is small, but there is much bleeding water in the upper layer.
* 2: Viscosity was too high to be measured.
試験区分4(ソイルセメントスラリーの調製及び評価)
・ソイルセメントスラリーの調製(実施例32〜62及び比較例18〜34)
表5及び表6に記載のセメントスラリー組成物(SL―1〜SL―31及びRSL―1〜RSL―17)を用い、ソイルセメントスラリーの単位容積当たりの結合材量が同等となるようセメントスラリー組成物の注入量を設定し、ソイルセメントスラリー組成物を調製した。調製は、ホバートミキサーに所定量のセメントスラリーを投入した後、表7に記載の物性値を有する混合土を加えて撹拌混合し、ソイルセメントスラリー(実施例32〜62及び比較例18〜34)とした。各例で調製したソイルセメントスラリーの内容を表8及び表9にまとめて示した。
Test category 4 (Preparation and evaluation of soil cement slurry)
-Preparation of soil cement slurry (Examples 32-62 and Comparative Examples 18-34)
Cement slurry using the cement slurry compositions (SL-1 to SL-31 and RSL-1 to RSL-17) described in Tables 5 and 6 so that the amount of the binder per unit volume of the soil cement slurry is equivalent. The injection amount of the composition was set, and a soil cement slurry composition was prepared. In the preparation, a predetermined amount of cement slurry was put into a Hobart mixer, and then mixed soil having the physical property values shown in Table 7 was added and mixed by stirring to prepare a soil cement slurry (Examples 32-62 and Comparative Examples 18-34). It was. The contents of the soil cement slurry prepared in each example are summarized in Tables 8 and 9.
・ソイルセメントスラリーの物性評価
調製した各例のソイルセメントスラリーについて、下記に示す方法で練混ぜ直後のフロー及び得られた硬化体の一軸圧縮強度を測定した。結果を表8及び表9にまとめて示した。
-Physical property evaluation of soil cement slurry About the prepared soil cement slurry of each example, the flow immediately after mixing and the uniaxial compressive strength of the obtained hardening body were measured by the method shown below. The results are summarized in Table 8 and Table 9.
・フローによる流動性評価
JIS−R5201に準拠し、調製直後にフロー試験を行い、15回落下後のフロー(mm)を測定した。
-Flowability evaluation by flow Based on JIS-R5201, the flow test was performed immediately after preparation, and the flow (mm) after falling 15 times was measured.
・強度発現性評価
JIS−A1216に準拠して、直径50mm×高さ100mmの供試体を作製し、材齢7日と材齢28日の一軸圧縮強度(N/mm2)を測定した。
-Strength development evaluation Based on JIS-A1216, the test piece of diameter 50mm x height 100mm was produced, and the uniaxial compressive strength (N / mm < 2 >) of material age 7 days and material age 28 days was measured.
表8及び表9において、
セメントスラリー組成物の注入量:混合土1m3当たり注入したセメントスラリー組成物の容積(m3)
In Table 8 and Table 9,
Injection amount of cement slurry composition: volume of cement slurry composition injected per 1 m 3 of mixed soil (m 3 )
表5、表6、表8及び表9の結果からも明らかなように、本発明のスラリー組成物を用いることにより、セメントスラリー粘性を増加させることなく水/結合材の質量比を低減し、且つ沈殿物の発生を抑制できる。また本発明のスラリー組成物を使用したソイルセメントスラリーでは、地盤改良において原位置地盤に注入するソイルセメントスラリーの量を低減しつつ、施工に充分耐え得る流動性及び強度を発現させ得ることができる。 As is apparent from the results of Table 5, Table 6, Table 8, and Table 9, by using the slurry composition of the present invention, the water / binder mass ratio is reduced without increasing the cement slurry viscosity, And generation | occurrence | production of a precipitate can be suppressed. Moreover, in the soil cement slurry using the slurry composition of the present invention, it is possible to develop fluidity and strength that can sufficiently withstand construction while reducing the amount of the soil cement slurry injected into the ground in the ground improvement. .
Claims (8)
結合材:粉末度が2000〜11000cm2/gの高炉スラグ微粉末を30〜75質量%、ポルトランドセメントを25〜70質量%及び石膏を0〜20質量%(合計100質量%)の割合で含有して成るもの。
混和剤:下記のA成分及び下記のB成分からなるもの。
A成分:下記の水溶性ビニル共重合体(1)及び/又は下記の水溶性ビニル共重合体(2)。
水溶性ビニル共重合体(1):分子中に下記の化1で示される化合物から形成された構成単位Lを30〜60モル%及び下記の化2で示される化合物から形成された構成単位Mを70〜40モル%(合計100モル%)の割合で有する質量平均分子量2000〜80000の水溶性ビニル共重合体。
水溶性ビニル共重合体(2):分子中に下記の化3で示される化合物から形成された構成単位Pを10〜65モル%及び下記の化4で示される化合物から形成された構成単位Qを35〜90モル%(合計100モル%)の割合で有する質量平均分子量2000〜80000の水溶性ビニル共重合体。
B成分:グルコン酸、グルコン酸塩、メラミンスルホン酸ホルムアルデヒド高縮合物及びメラミンスルホン酸ホルムアルデヒド高縮合物の塩から選ばれる一つ又は二つ以上。
R1,R3,R4,R7:水素原子又はメチル基
R2,R6:水素原子又は炭素数1〜8のアルキル基
R5:下記の化5又は化6で示される有機基
R8:水素原子、メチル基又は下記の化7で示される有機基
m:1又は2の整数
AO:オキシエチレン基及び/又はオキシプロピレン基
n:5〜100の整数
u:5〜200の整数
X1,X2,Y:水素原子、一価金属、二価金属、アンモニウム又は有機アミン基
t:1又は2の整数)
Z:水素原子、一価金属、二価金属、アンモニウム又は有機アミン基)} A blast furnace slag-containing cement slurry composition containing the following binder, the following admixture and water, wherein the mass ratio of water / binder is 30 to 60%, and relative to 100 parts by mass of the binder A cement slurry composition containing a blast furnace slag containing an admixture in a proportion of 0.01 to 3 parts by mass.
Binder: 30 to 75% by mass of fine powder of blast furnace slag having a fineness of 2000 to 11000 cm 2 / g, 25 to 70% by mass of Portland cement, and 0 to 20% by mass (total 100% by mass) of gypsum It consists of.
Admixture: Composed of the following A component and the following B component.
Component A: The following water-soluble vinyl copolymer (1) and / or the following water-soluble vinyl copolymer (2).
Water-soluble vinyl copolymer (1): 30 to 60 mol% of the structural unit L formed from the compound represented by the following chemical formula 1 in the molecule and the structural unit M formed from the compound represented by the chemical formula 2 below A water-soluble vinyl copolymer having a mass average molecular weight of 2000 to 80000 having a ratio of 70 to 40 mol% (100 mol% in total).
Water-soluble vinyl copolymer (2): 10 to 65 mol% of the structural unit P formed from the compound represented by the following chemical formula 3 in the molecule and the structural unit Q formed from the compound represented by the chemical formula 4 below A water-soluble vinyl copolymer having a mass average molecular weight of 2000 to 80000 having a ratio of 35 to 90 mol% (total 100 mol%).
Component B: one or more selected from gluconic acid, gluconate, melamine sulfonic acid formaldehyde high condensate and melamine sulfonic acid formaldehyde high condensate salt.
R 1 , R 3 , R 4 , R 7 : hydrogen atom or methyl group R 2 , R 6 : hydrogen atom or alkyl group having 1 to 8 carbon atoms R 5 : organic group represented by the following chemical formula 5 or chemical formula R 8 : a hydrogen atom, a methyl group, or an organic group represented by the following chemical formula 7 m: an integer of 1 or 2 AO: an oxyethylene group and / or an oxypropylene group n: an integer of 5 to 100 u: an integer of 5 to 200 X 1 , X 2 , Y: hydrogen atom, monovalent metal, divalent metal, ammonium or organic amine group
t: integer of 1 or 2)
Z: hydrogen atom, monovalent metal, divalent metal, ammonium or organic amine group)}
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