JP2012136403A - Grout composition for concrete placing joint - Google Patents
Grout composition for concrete placing joint Download PDFInfo
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- JP2012136403A JP2012136403A JP2010290675A JP2010290675A JP2012136403A JP 2012136403 A JP2012136403 A JP 2012136403A JP 2010290675 A JP2010290675 A JP 2010290675A JP 2010290675 A JP2010290675 A JP 2010290675A JP 2012136403 A JP2012136403 A JP 2012136403A
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- cement
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- 239000011440 grout Substances 0.000 title claims abstract description 79
- 239000004567 concrete Substances 0.000 title claims abstract description 67
- 239000000203 mixture Substances 0.000 title claims abstract description 54
- 239000000463 material Substances 0.000 claims abstract description 77
- 239000004568 cement Substances 0.000 claims abstract description 47
- 239000002562 thickening agent Substances 0.000 claims abstract description 19
- 239000004088 foaming agent Substances 0.000 claims abstract description 18
- 239000002270 dispersing agent Substances 0.000 claims abstract description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 32
- 239000002518 antifoaming agent Substances 0.000 claims description 7
- 239000011230 binding agent Substances 0.000 claims description 6
- 239000003795 chemical substances by application Substances 0.000 claims description 2
- 238000002347 injection Methods 0.000 abstract description 22
- 239000007924 injection Substances 0.000 abstract description 22
- 230000000740 bleeding effect Effects 0.000 abstract description 16
- 239000011178 precast concrete Substances 0.000 abstract description 11
- 239000000654 additive Substances 0.000 abstract 1
- 230000000996 additive effect Effects 0.000 abstract 1
- 238000005204 segregation Methods 0.000 abstract 1
- 239000000243 solution Substances 0.000 abstract 1
- 230000000052 comparative effect Effects 0.000 description 20
- 238000000926 separation method Methods 0.000 description 15
- 239000003638 chemical reducing agent Substances 0.000 description 12
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 10
- 239000000843 powder Substances 0.000 description 10
- 238000004898 kneading Methods 0.000 description 9
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 8
- 230000000694 effects Effects 0.000 description 8
- 238000002156 mixing Methods 0.000 description 8
- 238000010998 test method Methods 0.000 description 8
- 229910021487 silica fume Inorganic materials 0.000 description 7
- 230000018044 dehydration Effects 0.000 description 5
- 238000006297 dehydration reaction Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 239000011444 non-shrink grout Substances 0.000 description 5
- 239000011398 Portland cement Substances 0.000 description 4
- 239000000292 calcium oxide Substances 0.000 description 4
- 235000012255 calcium oxide Nutrition 0.000 description 4
- 238000010276 construction Methods 0.000 description 4
- 238000011156 evaluation Methods 0.000 description 4
- 239000011396 hydraulic cement Substances 0.000 description 4
- 239000004576 sand Substances 0.000 description 4
- 239000010881 fly ash Substances 0.000 description 3
- 238000006703 hydration reaction Methods 0.000 description 3
- 230000001771 impaired effect Effects 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 239000002893 slag Substances 0.000 description 3
- 239000004575 stone Substances 0.000 description 3
- 229920001732 Lignosulfonate Polymers 0.000 description 2
- 229920000877 Melamine resin Polymers 0.000 description 2
- 239000004480 active ingredient Substances 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 239000001913 cellulose Substances 0.000 description 2
- 229920002678 cellulose Polymers 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 230000036571 hydration Effects 0.000 description 2
- 239000011256 inorganic filler Substances 0.000 description 2
- 229910003475 inorganic filler Inorganic materials 0.000 description 2
- 230000010354 integration Effects 0.000 description 2
- 238000005304 joining Methods 0.000 description 2
- JDSHMPZPIAZGSV-UHFFFAOYSA-N melamine Chemical compound NC1=NC(N)=NC(N)=N1 JDSHMPZPIAZGSV-UHFFFAOYSA-N 0.000 description 2
- 239000004570 mortar (masonry) Substances 0.000 description 2
- 229920005646 polycarboxylate Polymers 0.000 description 2
- 239000000377 silicon dioxide Substances 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- BDHFUVZGWQCTTF-UHFFFAOYSA-M sulfonate Chemical compound [O-]S(=O)=O BDHFUVZGWQCTTF-UHFFFAOYSA-M 0.000 description 2
- OHVLMTFVQDZYHP-UHFFFAOYSA-N 1-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)-2-[4-[2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidin-5-yl]piperazin-1-yl]ethanone Chemical compound N1N=NC=2CN(CCC=21)C(CN1CCN(CC1)C=1C=NC(=NC=1)NCC1=CC(=CC=C1)OC(F)(F)F)=O OHVLMTFVQDZYHP-UHFFFAOYSA-N 0.000 description 1
- HMUNWXXNJPVALC-UHFFFAOYSA-N 1-[4-[2-(2,3-dihydro-1H-inden-2-ylamino)pyrimidin-5-yl]piperazin-1-yl]-2-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)ethanone Chemical compound C1C(CC2=CC=CC=C12)NC1=NC=C(C=N1)N1CCN(CC1)C(CN1CC2=C(CC1)NN=N2)=O HMUNWXXNJPVALC-UHFFFAOYSA-N 0.000 description 1
- VZSRBBMJRBPUNF-UHFFFAOYSA-N 2-(2,3-dihydro-1H-inden-2-ylamino)-N-[3-oxo-3-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)propyl]pyrimidine-5-carboxamide Chemical compound C1C(CC2=CC=CC=C12)NC1=NC=C(C=N1)C(=O)NCCC(N1CC2=C(CC1)NN=N2)=O VZSRBBMJRBPUNF-UHFFFAOYSA-N 0.000 description 1
- LDXJRKWFNNFDSA-UHFFFAOYSA-N 2-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)-1-[4-[2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidin-5-yl]piperazin-1-yl]ethanone Chemical compound C1CN(CC2=NNN=C21)CC(=O)N3CCN(CC3)C4=CN=C(N=C4)NCC5=CC(=CC=C5)OC(F)(F)F LDXJRKWFNNFDSA-UHFFFAOYSA-N 0.000 description 1
- WZFUQSJFWNHZHM-UHFFFAOYSA-N 2-[4-[2-(2,3-dihydro-1H-inden-2-ylamino)pyrimidin-5-yl]piperazin-1-yl]-1-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)ethanone Chemical compound C1C(CC2=CC=CC=C12)NC1=NC=C(C=N1)N1CCN(CC1)CC(=O)N1CC2=C(CC1)NN=N2 WZFUQSJFWNHZHM-UHFFFAOYSA-N 0.000 description 1
- YLZOPXRUQYQQID-UHFFFAOYSA-N 3-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)-1-[4-[2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidin-5-yl]piperazin-1-yl]propan-1-one Chemical compound N1N=NC=2CN(CCC=21)CCC(=O)N1CCN(CC1)C=1C=NC(=NC=1)NCC1=CC(=CC=C1)OC(F)(F)F YLZOPXRUQYQQID-UHFFFAOYSA-N 0.000 description 1
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- 229920002134 Carboxymethyl cellulose Polymers 0.000 description 1
- 229920002907 Guar gum Polymers 0.000 description 1
- 229920000663 Hydroxyethyl cellulose Polymers 0.000 description 1
- 239000004354 Hydroxyethyl cellulose Substances 0.000 description 1
- 229920002153 Hydroxypropyl cellulose Polymers 0.000 description 1
- 235000019738 Limestone Nutrition 0.000 description 1
- MKYBYDHXWVHEJW-UHFFFAOYSA-N N-[1-oxo-1-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)propan-2-yl]-2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidine-5-carboxamide Chemical compound O=C(C(C)NC(=O)C=1C=NC(=NC=1)NCC1=CC(=CC=C1)OC(F)(F)F)N1CC2=C(CC1)NN=N2 MKYBYDHXWVHEJW-UHFFFAOYSA-N 0.000 description 1
- NIPNSKYNPDTRPC-UHFFFAOYSA-N N-[2-oxo-2-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)ethyl]-2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidine-5-carboxamide Chemical compound O=C(CNC(=O)C=1C=NC(=NC=1)NCC1=CC(=CC=C1)OC(F)(F)F)N1CC2=C(CC1)NN=N2 NIPNSKYNPDTRPC-UHFFFAOYSA-N 0.000 description 1
- AFCARXCZXQIEQB-UHFFFAOYSA-N N-[3-oxo-3-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)propyl]-2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidine-5-carboxamide Chemical compound O=C(CCNC(=O)C=1C=NC(=NC=1)NCC1=CC(=CC=C1)OC(F)(F)F)N1CC2=C(CC1)NN=N2 AFCARXCZXQIEQB-UHFFFAOYSA-N 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 239000006004 Quartz sand Substances 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 239000001768 carboxy methyl cellulose Substances 0.000 description 1
- 235000010948 carboxy methyl cellulose Nutrition 0.000 description 1
- 239000008112 carboxymethyl-cellulose Substances 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 239000002734 clay mineral Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 229910001653 ettringite Inorganic materials 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 238000005187 foaming Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000000665 guar gum Substances 0.000 description 1
- 235000010417 guar gum Nutrition 0.000 description 1
- 229960002154 guar gum Drugs 0.000 description 1
- 229910052602 gypsum Inorganic materials 0.000 description 1
- 239000010440 gypsum Substances 0.000 description 1
- 235000019447 hydroxyethyl cellulose Nutrition 0.000 description 1
- 239000001863 hydroxypropyl cellulose Substances 0.000 description 1
- 235000010977 hydroxypropyl cellulose Nutrition 0.000 description 1
- 239000001866 hydroxypropyl methyl cellulose Substances 0.000 description 1
- 229920003088 hydroxypropyl methyl cellulose Polymers 0.000 description 1
- 235000010979 hydroxypropyl methyl cellulose Nutrition 0.000 description 1
- UFVKGYZPFZQRLF-UHFFFAOYSA-N hydroxypropyl methyl cellulose Chemical compound OC1C(O)C(OC)OC(CO)C1OC1C(O)C(O)C(OC2C(C(O)C(OC3C(C(O)C(O)C(CO)O3)O)C(CO)O2)O)C(CO)O1 UFVKGYZPFZQRLF-UHFFFAOYSA-N 0.000 description 1
- 239000006028 limestone Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229920000609 methyl cellulose Polymers 0.000 description 1
- 239000001923 methylcellulose Substances 0.000 description 1
- 235000010981 methylcellulose Nutrition 0.000 description 1
- DCNHVBSAFCNMBK-UHFFFAOYSA-N naphthalene-1-sulfonic acid;hydrate Chemical compound O.C1=CC=C2C(S(=O)(=O)O)=CC=CC2=C1 DCNHVBSAFCNMBK-UHFFFAOYSA-N 0.000 description 1
- 239000002736 nonionic surfactant Substances 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 150000002978 peroxides Chemical class 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- -1 polyethylene Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
- 241000894007 species Species 0.000 description 1
- 230000008961 swelling Effects 0.000 description 1
- 229920002803 thermoplastic polyurethane Polymers 0.000 description 1
- 230000008719 thickening Effects 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
Landscapes
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
Description
本発明は、先打ちコンクリートと後打ちコンクリートとの打継面に生じる隙間に充填するコンクリート打継ぎ部用グラウト組成物に関する。詳しくは、先打ちコンクリートの打継ぎ部に予め注入ホースを取り付けておき、後打ちコンクリートが硬化した後にホースを通して打継ぎ部分に注入材を充填し、間隙を隅々まで埋める工法に用いるグラウト材であり、材料分離抵抗性が大きく、材齢２８日における圧縮強度が８０Ｎ/mm2を超えるコンクリート打継ぎ部用グラウト組成物に関する。 The present invention relates to a grout composition for a concrete joint portion that fills a gap formed on a joint surface between precast concrete and postcast concrete. Specifically, it is a grout material used in a construction method in which an injection hose is attached in advance to the joint portion of the precast concrete, and after the post-cast concrete has hardened, the injection material is filled into the joint portion through the hose and the gap is filled to every corner. Further, the present invention relates to a grout composition for a concrete joint part having a high material separation resistance and a compressive strength at a material age of 28 days exceeding 80 N / mm 2 .
一般的に、先打ちコンクリートと後打ちコンクリートとの打継面、殊に、先打ちコンクリートの下に後打ちコンクリートを打継ぎする場合の打継面には往々にして隙間が生ずる。この隙間は、打設における時間差があり、また打ち継ぎ部にはコンクリートの連行空気や施工の不良、誤差により発生するジャンカ等により、その密着化を図ることが困難な場合がある。隙間があると湧水の浸入の原因となるため、先打ちと後打ちの双方のコンクリート層の合端は止水処理を施す必要が生じている。また、隙間は漏水の原因になるだけでなく、構造耐力の低下の原因にもなるため、一般には、エポキシ樹脂、ウレタン樹脂、セメント系スラリー等の止水用注入材を注入して埋められる。 In general, a gap often occurs on the joint surface between the precast concrete and the postcast concrete, particularly when the postcast concrete is cast under the precast concrete. This gap has a time difference in placing, and it may be difficult to achieve close contact between the joints due to the entrained air of concrete, poor construction, and jumpers generated due to errors. If there is a gap, it will cause the intrusion of spring water, so it is necessary to apply a water stop treatment to the end of both the front and back concrete layers. Further, since the gap not only causes water leakage but also causes a decrease in structural strength, it is generally filled by injecting a water-stopping injection material such as an epoxy resin, a urethane resin, or a cement slurry.
この種のグラウト材（注入材）は、先打ちコンクリートと後打ちコンクリートの打ち継ぎ部の密着性を高めるとともに、打ち継ぎ部の水平方向または上下方向のコーナー部に対しても止水材注入用ホースを安定した状態で配設することができるようにしたコンクリート打ち継ぎ部の各種止水工法とともに用いられている。具体的には、先打ちコンクリートの打継ぎ部に予め注入ホースを取り付けておき、後打ちコンクリートが硬化した後にホースを通して打継ぎ部分に注入材を充填し、間隙を隅々まで埋める工法である。これら工法の一例として、例えば逆打ち工法によるコンクリートの打継方法（特許第４２１２５３０号）が挙げられる。 This type of grout material (injection material) enhances the adhesion of joints between precast concrete and postcast concrete, and is also used to inject water-stopping material into the horizontal or vertical corners of the joint. It is used together with various water-stopping methods for concrete joints that allow the hose to be placed in a stable state. Specifically, the injection hose is attached in advance to the joint portion of the precast concrete, and after the post-cast concrete is cured, the injection material is filled into the joint portion through the hose, and the gap is filled to every corner. As an example of these construction methods, for example, a concrete joining method (Patent No. 4212530) by a reverse casting method is cited.
先打ちコンクリートと後打ちコンクリートとの打継面に生じる隙間に注入ホースを通して打継ぎ部分に注入材を充填するには、注入材の特性として、練り混ぜが容易なこと、低粘性で流動性が良好でありポンプ圧送性や充填性に優れていること、加圧注入による材料分離が生じないこと、可使時間が長いこと、ブリーディングが無いこと、適度の膨張性があること、高強度であること等が要求される。 In order to fill the joint with the injection hose through the injection hose in the gap formed on the joint surface between the pre-cast concrete and the post-cast concrete, the characteristics of the cast material are easy mixing, low viscosity and fluidity. Good, excellent pumpability and filling properties, no material separation by pressure injection, long pot life, no bleeding, moderate expansibility, high strength Is required.
一般的に、低粘性で材料分離抵抗性に強く、高強度を発現させるには、シリカフューム等の活性シリカをセメントに添加することが知られている。しかしながら、シリカフューム等の粉末は微細粒であるため、凝集粒が発生し易い。そのため、練り上げたグラウトやスラリーにシリカフューム等の凝集粒が分散化せずに残存している場合が多い。このため、コンクリート打継ぎ部分の注入に用いられる小間隙注入ホースを通してコンクリート打継ぎ部分に注入材を充填すると、しばしば注入弁や注入ホースを詰まれせる不具合が生じていた。 In general, it is known to add active silica such as silica fume to cement in order to exhibit high viscosity with low viscosity and strong material separation resistance. However, since powders such as silica fume are fine particles, aggregated particles are easily generated. Therefore, in many cases, agglomerated particles such as silica fume remain in the grout or slurry that has been kneaded without being dispersed. For this reason, when the injection material is filled into the concrete joint portion through the small gap injection hose used for the injection of the concrete joint portion, there is often a problem that the injection valve and the injection hose are clogged.
一方で、コンクリート部材としての構造的一体性を阻害することなく、止水性を確保し膨張性を有する水硬性セメント組成物を提供することを目的として、（Ａ）水硬性セメント１００重量部に対し、（Ｂ）親水性有機溶剤５〜２０重量部、（Ｃ）非イオン性界面活性剤５〜２５重量部、（Ｄ）微粒子無機充填材５〜３０重量部及び（Ｅ）セメント系膨張材１〜１５重量部及び／又は無機系膨潤材２〜３０重量部を配合してなる膨張性を有する水硬性セメント組成物が知られている（例えば、特許文献１）。しかし、この組成物は圧縮強度が小さく、流動性に劣るため、ホースを通してコンクリート打継ぎ部分に充填することが難しく、コンクリート打継ぎ部用注入材には適さない。 On the other hand, for the purpose of providing a hydraulic cement composition that secures water stoppage and has expansibility without hindering structural integrity as a concrete member, (A) for 100 parts by weight of hydraulic cement (B) 5-20 parts by weight of a hydrophilic organic solvent, (C) 5-25 parts by weight of a nonionic surfactant, (D) 5-30 parts by weight of a fine inorganic filler, and (E) a cement-based expansion material 1 A hydraulic cement composition having an expansibility obtained by blending ˜15 parts by weight and / or 2 to 30 parts by weight of an inorganic swelling material is known (for example, Patent Document 1). However, since this composition has a small compressive strength and is inferior in fluidity, it is difficult to fill the concrete joint part through a hose, and is not suitable for an injection material for a concrete joint part.
また、シリカフュームを用いない水、ポルトランドセメント、珪砂、膨張材、減水剤、発泡剤及び混和材で構成される高強度無収縮グラウト材に用いられる混和材であって、平均粒径が２μｍ以下であると共に、円形度が０.９０以上の球状石灰石微粉末からなる土木一般分野で使用される高強度無収縮グラウト材が知られている（例えば、特許文献２）。これらは、８０Ｎ/mm2を超える高強度を発現するものの、ホースを通してコンクリート打継ぎ部分に注入材を圧入充填すると、目詰まりを起こして充填不良を生じ、流動性に劣り、施工性を考慮すると好ましくなかった。 Further, it is an admixture used for high-strength non-shrink grout material composed of water, portland cement, silica sand, expansion material, water reducing agent, foaming agent and admixture without using silica fume, and having an average particle size of 2 μm or less. There is also known a high-strength non-shrink grout material used in the general civil engineering field composed of spherical limestone fine powder having a circularity of 0.90 or more (for example, Patent Document 2). These exhibit high strength exceeding 80 N / mm 2 , but when the injection material is press-fitted into the concrete joint through a hose, clogging occurs, resulting in poor filling, poor fluidity and workability. It was not preferable.
また、グラウト用混和材として、減水剤にポリカルボン酸塩系減水剤とリグニンスルホン酸塩系減水剤とを特定の割合で併用し、膨張材、無機微粉末、増粘剤及び発泡材を配合したグラウト用混和材或いは当該混和材に、更にセメントと細骨材とを配合したグラウトのセメント組成物が知られている（例えば、特許文献３）。これらは、６０Ｎ/mm2程度の圧縮強度であり、近年の超高強度化に対応するには強度発現性に乏しい。また、ホースを通してコンクリート打継ぎ部分に加圧注入した場合、ブリーディングが発生し、材料分離抵抗性に劣り、コンクリート部材との一体化を図ることが難しい。 In addition, as a grout admixture, a water reducing agent is used in combination with a polycarboxylate-based water reducing agent and a lignin sulfonate-based water reducing agent in a specific ratio, and an expansion material, inorganic fine powder, thickener and foaming material are blended. A grout cement composition obtained by further blending cement and fine aggregate with the admixture for grout or the admixture is known (for example, Patent Document 3). These have a compressive strength of about 60 N / mm 2 , and lack strength development in order to cope with the recent ultra-high strength. In addition, when pressure is injected through the hose to the concrete joining portion, bleeding occurs, the material separation resistance is poor, and it is difficult to achieve integration with the concrete member.
本発明は、従来の上記課題を解決したものであり、水と混練したときに超低粘性の高流動性を発現し、先打ちコンクリートと後打ちコンクリートとの打継面に生じる隙間に注入ホースを通して打継ぎ部分に注入するときに容易に注入可能であり、ブリーディングが発生することが無く、材料分離抵抗性に優れており、しかも自己収縮ひずみが小さく適度な膨張性によってコンクリート部材との一体化を図り、安定した高い強度発現性を有するプレミックス型のコンクリート打継ぎ部用として好適なグラウト組成物を提供する。 The present invention solves the above-mentioned conventional problems, and exhibits an extremely low viscosity and high fluidity when kneaded with water, and injects a hose into a gap generated on the joint surface between the precast concrete and the postcast concrete. It can be easily injected when injected into the splicing part through, there is no bleeding, it has excellent material separation resistance, self-shrinking strain is small, and it is integrated with a concrete member by moderate expansibility Therefore, a grout composition suitable for a premix type concrete joint having a stable and high strength development property is provided.
本発明者は、プレミックス型のコンクリート打継ぎ部用グラウト組成物の特性と各成分の種類および配合量との関係について種々検討したところ、早強セメントおよび膨張材を一定量含有させ、これに一定量の増粘剤とセメント分散剤、発泡剤を組み合せて配合することによって、上記課題を解決したプレミックスタイプのコンクリート打継ぎ部用グラウト組成物が得られることを見い出した。本発明はこの知見に基づく。 The inventor conducted various studies on the relationship between the characteristics of the premix-type grout composition for concrete joints and the types and amounts of each component. It has been found that a premix-type grout composition for a concrete joint part that solves the above problems can be obtained by combining a certain amount of a thickener, a cement dispersant, and a foaming agent. The present invention is based on this finding.
本発明は、以下の構成からなるコンクリート打継ぎ部用グラウト組成物、およびそのグラウト材に関する。
〔１〕セメントを主体とし、かつ早強セメントを１５質量％以上含有し、さらに膨張材１.０〜５.０質量％、増粘剤０.０１〜０.１質量％、セメント分散剤０.２〜２.０質量％、および発泡剤０.０００５〜０.００５質量％を含有することを特徴とするプレミックスタイプのコンクリート打継ぎ部用グラウト組成物。
〔２〕早強セメント２０質量％以上、膨張材２.０〜４.５質量％、増粘剤０.０２〜０.０６質量％、セメント分散剤０.５〜１.５質量％、および発泡剤０.０００７〜０.００３質量％を含有する請求項１に記載するコンクリート打継ぎ部用グラウト組成物。
〔３〕上記[１]または上記[２]のグラウト組成物において、さらに消泡剤０.００１〜０.０８質量％を含有するコンクリート打継ぎ部用グラウト組成物。
〔４〕上記[１]〜上記[３]の何れかに記載するグラウト組成物を、水／結合材比３０〜４５％で練り混ぜたコンクリート打継ぎ部用無収縮グラウト材。
〔５〕ＪＰロート流下時間が６秒以下であって、材齢２８日圧縮強度が９５Ｎ/ｍｍ2以上である上記[４]に記載するグラウト材。
The present invention relates to a grout composition for a concrete joint having the following structure, and a grout material thereof.
[1] Mainly containing cement and containing 15% by mass or more of early-strength cement, 1.0 to 5.0% by mass of an expanding material, 0.01 to 0.1% by mass of a thickener, and 0 of a cement dispersant A premix-type grout composition for a concrete joint, characterized by containing .2 to 2.0% by mass and a foaming agent of 0.0005 to 0.005% by mass.
[2] Early strength cement 20% by mass or more, expansion agent 2.0 to 4.5% by mass, thickener 0.02 to 0.06% by mass, cement dispersant 0.5 to 1.5% by mass, and The grout composition for a concrete joint according to claim 1, which contains 0.0007 to 0.003 mass% of a foaming agent.
[3] A grout composition for concrete joints, which further comprises 0.001 to 0.08% by mass of an antifoaming agent in the grout composition according to [1] or [2].
[4] A non-shrinkage grout material for a concrete joint part obtained by kneading the grout composition according to any one of [1] to [3] above at a water / binding material ratio of 30 to 45%.
[5] The grout material according to the above [4], wherein the JP funnel flow time is 6 seconds or less, and the compressive strength at the age of 28 days is 95 N / mm 2 or more.
本発明のプレミックスタイプのコンクリート打継ぎ部用グラウト組成物を用いれば、特定の水結合比で使用することにより、超低粘性の流動性を発現し、先打ちコンクリートと後打ちコンクリートとの打継面に生じる隙間に注入する際に、材料分離やブリーディングが発生することが無く容易に充填できる。また、本発明のグラウト組成物は自己収縮ひずみが小さく適度な膨張発現によって硬化収縮ひび割れを抑制し、安定した高い強度発現性を有しており、またプレミックス型の無収縮グラウト材であるため、常に安定した品質性能を保持し、充填した部材コンクリートの間の一体化を図った構造物を得ることができる。 If the premix-type concrete joint grout composition of the present invention is used at a specific water bonding ratio, it exhibits ultra-low viscosity fluidity, and the cast-in concrete and post-cast concrete are cast. When injecting into the gap formed on the joint surface, the material can be easily filled without causing material separation or bleeding. In addition, since the grout composition of the present invention has a small self-shrinkage strain and suppresses hardening shrinkage cracks due to appropriate expansion, it has a stable and high strength development property, and is a premix type non-shrink grout material. Thus, it is possible to obtain a structure that always maintains stable quality performance and is integrated between the filled member concrete.
以下、本発明を実施形態に基づいて具体的に説明する。なお、％は特に示す場合及び単位固有の場合を除き質量％である。 Hereinafter, the present invention will be specifically described based on embodiments. In addition,% is mass% except the case where it shows in particular and the case intrinsic | native to a unit.
本発明のグラウト組成物は、セメントを主体とし、かつ早強セメントを１５質量％以上含有し、さらに膨張材１.０〜５.０質量％、増粘剤０.０１〜０.１質量％、セメント分散剤０.２〜２.０質量％、および発泡剤０.０００５〜０.００５質量％を含有することを特徴とするプレミックスタイプのコンクリート打継ぎ部用グラウト組成物である。 The grout composition of the present invention is mainly composed of cement and contains 15% by mass or more of early-strength cement, 1.0 to 5.0% by mass of an expanding material, and 0.01 to 0.1% by mass of a thickener. A premix-type grout composition for a concrete joint, characterized by containing 0.2 to 2.0 mass% of a cement dispersant and 0.0005 to 0.005 mass% of a foaming agent.
本発明のグラウト組成物はセメントを主体とする。好ましくは、セメントを９０質量％〜９８質量％含有する。セメントのうち早強セメントを１５質量％以上含有する。早強セメントの種類は限定されない。一般的には早強ポルトランドセメントが挙げられる。 The grout composition of the present invention is mainly composed of cement. Preferably, the cement is contained in 90% by mass to 98% by mass. Of the cement, it contains 15% by mass or more of early strong cement. The kind of early strong cement is not limited. Generally, early-strength Portland cement is used.
本発明のグラウト組成物における早強セメントの含有量は１５％以上である。早強セメントの含有量が１５％未満では、特に高温度下においてコンクリート打継ぎ部にグラウトを注入施工したときにブリーディングが発生し、初期強度発現性も低下するので好ましくない。ブリーディングの発生を抑え、超高流動で可使時間を長く確保するには早強セメントの含有量は２０〜８０％が好ましく、４０〜８０％がより好ましい。 The content of the early strong cement in the grout composition of the present invention is 15% or more. If the content of the early strong cement is less than 15%, bleeding occurs when the grout is poured into the concrete joint, particularly at a high temperature. In order to suppress the occurrence of bleeding and ensure a long working life with ultra-high flow, the content of the early strong cement is preferably 20 to 80%, more preferably 40 to 80%.
早強セメント以外に、本発明の効果を損なわない範囲で、モルタルやコンクリートに使用されるセメントや混和材料を添加することができる。このセメントや混和材料としては、例えば、普通、低熱、中庸熱、白色等の各種ポルトランドセメント、エコセメント、並びにこれらポルトランドセメント又はエコセメントにフライアッシュ、高炉スラグ、シリカヒューム等を混合した各種混合セメント、石膏、石粉、粘土鉱物粉末、スラグ粉末、フライアッシュ、シリカフューム、無機質フィラー等が挙げられ、これらの一種又は二種以上を本発明による効果を阻害しない範囲で使用することができる。 In addition to the early strong cement, cement and admixtures used for mortar and concrete can be added as long as the effects of the present invention are not impaired. Examples of the cement and admixture include various portland cements such as normal, low heat, medium heat and white, eco cement, and various mixed cements obtained by mixing fly ash, blast furnace slag, silica fume, etc. with these portland cement or eco cement. , Gypsum, stone powder, clay mineral powder, slag powder, fly ash, silica fume, inorganic filler, and the like, and one or more of these can be used as long as the effects of the present invention are not impaired.
本発明のグラウト組成物は膨張材を含有する。膨張材の種類は限定されず、一般的には遊離生石灰を有効成分とする生石灰系膨張材、カルシウムサルホアルミネート等のエトリンガイト生成物質を有効成分とするエトリンガイト系膨張材、遊離生石灰とエトリンガイト生成物質の複合系膨張材が代表的なものとして挙げられる。このうち、生石灰系膨張材は一般に水和反応活性が高く、特にコンクリートの大規模な初期収縮を抑制する効果に優れることが知られている。 The grout composition of the present invention contains an expansion material. The type of expansion material is not limited. Generally, quick lime-based expansion material containing free quick lime as an active ingredient, ettringite-based expansion material containing ettringite-generating substances such as calcium sulfoaluminate as active ingredients, free quick lime and ettringite-forming substances A typical example is a composite expansion material. Of these, quicklime-based expansive materials are generally known to have high hydration reaction activity, and in particular, are excellent in the effect of suppressing large-scale initial shrinkage of concrete.
本発明のグラウト組成物において、膨張材の含有量は１.０〜５.０％であり、２.０〜４.５％が好ましい。膨張材の含有量が１.０％未満では、自己収縮が大きくなり、硬化体に収縮ひび割れ等が発生し耐久性を損ねるので好ましくない。膨張材の含有量が５.０％を超えると、流動性不良、膨張過多による異常膨張や水和熱の上昇による温度ひび割れ等の恐れがあるため好ましくない。 In the grout composition of the present invention, the content of the expansion material is 1.0 to 5.0%, preferably 2.0 to 4.5%. If the content of the expandable material is less than 1.0%, the self-shrinkage becomes large, shrinkage cracks or the like occur in the cured body, and the durability is impaired. If the content of the expandable material exceeds 5.0%, there is a risk of poor fluidity, abnormal expansion due to excessive expansion, and temperature cracking due to an increase in heat of hydration, which is not preferable.
本発明のグラウト組成物は増粘剤を含有する。増粘剤の種類は限定されず、セルロース系増粘剤、アクリル系増粘剤、グアーガム系増粘剤などが挙げられる。このうち、セルロース系増粘剤が好ましく、例えば、カルボキシメチルセルロース、メチルセルロース、ヒドロキシプロピルメチルセルロース、ヒドロキシエチルセルロース、ヒドロキシプロピルセルロースが好ましい例として挙げられる。 The grout composition of the present invention contains a thickener. The type of the thickener is not limited, and examples thereof include a cellulose thickener, an acrylic thickener, and a guar gum thickener. Of these, cellulose-based thickeners are preferred, and preferred examples include carboxymethylcellulose, methylcellulose, hydroxypropylmethylcellulose, hydroxyethylcellulose, and hydroxypropylcellulose.
本発明のグラウト組成物において、増粘剤の含有量は０.０１〜０.１％であり、０.０２〜０.０６％が好ましい。増粘剤の含有量が０.０１％未満では、増粘効果に乏しく、材料分離やブリーディングが発生するので好ましくない。増粘剤の含有量が０.１％を超えるとワーカビリティが著しく低下し、良好なフレッシュ性状を維持することが困難であるため好ましくない。 In the grout composition of the present invention, the content of the thickening agent is 0.01 to 0.1%, preferably 0.02 to 0.06%. If the content of the thickener is less than 0.01%, the thickening effect is poor, and material separation and bleeding occur, which is not preferable. If the content of the thickener exceeds 0.1%, workability is remarkably lowered, and it is difficult to maintain good fresh properties, which is not preferable.
本発明のグラウト組成物はセメント分散剤を含有する。セメント分散剤の種類は限定されず、例えば、ポリカルボン酸塩系減水剤、ナフタレンスルホン酸塩系減水剤、メラミンスルホン酸塩系減水剤及びリグニンスルホン酸塩系減水剤が挙げられ、これらの１種又は２種以上を用いることができる。減水剤として高性能減水剤又は高性能ＡＥ減水剤を用いると、グラウトを超高強度とし易いことから好ましい。また、メラミンスルホン酸塩系減水剤が、セメントの水溶性アルカリの影響を受けにくく、セメントのばらつきに対して一定の流動性を保持し易いことから、品質の安定したプレミックス製品を製造する観点から好ましい。 The grout composition of the present invention contains a cement dispersant. The type of the cement dispersant is not limited, and examples thereof include polycarboxylate water reducing agents, naphthalene sulfonate water reducing agents, melamine sulfonate water reducing agents, and lignin sulfonate water reducing agents. Species or two or more can be used. It is preferable to use a high-performance water reducing agent or a high-performance AE water reducing agent as the water reducing agent because the grout can be easily made ultrahigh. In addition, the melamine sulfonate water reducing agent is not easily affected by the water-soluble alkali of the cement, and it is easy to maintain a certain fluidity with respect to the variation of the cement. To preferred.
本発明のグラウト組成物において、セメント分散剤の含有量は０.２〜２.０％であり、０.５〜１.５％が好ましい。分散剤の含有量が０.２％未満では、分散剤の効果が乏しく、ワーカビリティが著しく低下するので好ましくない。分散剤の含有量が２.０％を超えると凝結時間が遅延し、かつブリーディングが発生するため好ましくない。 In the grout composition of the present invention, the content of the cement dispersant is 0.2 to 2.0%, preferably 0.5 to 1.5%. If the content of the dispersant is less than 0.2%, the effect of the dispersant is poor, and the workability is remarkably lowered. If the content of the dispersant exceeds 2.0%, the setting time is delayed and bleeding occurs, which is not preferable.
本発明のグラウト組成物は発泡剤を含有する。発泡剤の種類は限定されず、具体的には水と混練後に気体を発生する物質であればよい。発泡剤を用いることによって自己収縮を抑制し易くなるとともに、グラウトを無収縮、即ちグラウトの初期膨張率を０％よりも大きくすることができる。この膨張作用によりグラウトの沈下現象を防止し、構造物との一体化を図る。その具体例として、例えば、アルミニウムや亜鉛等の両性金属の粉末や過酸化物質等が挙げられる。なかでも、アルミニウム粉末は効果的に発泡し、膨張作用を発揮することができるので好ましい。 The grout composition of the present invention contains a foaming agent. The kind of foaming agent is not limited, and specifically, any material that generates gas after kneading with water may be used. By using a foaming agent, self-shrinkage can be easily suppressed, and the grout can be prevented from shrinking, that is, the initial expansion rate of the grout can be made larger than 0%. This expansion action prevents the grout sinking phenomenon and integrates with the structure. Specific examples thereof include amphoteric metal powders such as aluminum and zinc, and peroxides. Among these, aluminum powder is preferable because it can effectively foam and exhibit an expansion action.
本発明のグラウト組成物において、発泡剤の含有量は０.０００５〜０.００５％であり、０.０００７〜０.００３％が好ましい。発泡剤の含有量が０.０００５％未満では発泡剤の膨張作用が発揮されず、０.００５％を超えると、グラウトの初期膨張率が２％を超え、過大膨張となり、寸法安定性の不具合により、構造物との一体化が図れず、かつ強度低下も招くので好ましくない。 In the grout composition of the present invention, the foaming agent content is 0.0005 to 0.005%, preferably 0.0007 to 0.003%. If the content of the foaming agent is less than 0.0005%, the expansion action of the foaming agent is not exhibited. If the content exceeds 0.005%, the initial expansion rate of the grout exceeds 2%, resulting in overexpansion and a problem in dimensional stability. This is not preferable because it cannot be integrated with the structure and the strength is reduced.
本発明のグラウト組成物には、消泡剤を微量混和することができる。この消泡剤の混和によって、僅かなグラウト中の気泡を消し、硬化体をより緻密化させることができる。本発明のグラウト組成物において、消泡剤の含有量は０.００１〜０.０８％が好ましく、さらに０.００３〜０.０３％がより好ましい。０.００１％未満では、消泡剤の効果が発揮されず、０.０８％を超えると、表面に気泡が押し上げられ、肌分れ等脆弱部位が発生するため好ましくない。 A small amount of an antifoaming agent can be mixed in the grout composition of the present invention. By mixing this antifoaming agent, a slight amount of bubbles in the grout can be eliminated, and the cured product can be further densified. In the grout composition of the present invention, the content of the antifoaming agent is preferably 0.001 to 0.08%, and more preferably 0.003 to 0.03%. If it is less than 0.001%, the effect of the antifoaming agent is not exhibited, and if it exceeds 0.08%, bubbles are pushed up on the surface and fragile parts such as skin breakage are generated, which is not preferable.
本発明のプレミックスタイプのコンクリート打継ぎ部用グラウト組成物には、本発明の効果を実質的に失わない範囲でモルタルやコンクリートに使用できる骨材を粉末化した石粉を使用できる。例えば、川砂、陸砂、海砂、砕砂、珪砂、川砂利、陸砂利、砕石、人口骨材などを用いることができる。 In the premix type grout composition for a concrete joint part of the present invention, stone powder obtained by pulverizing an aggregate that can be used for mortar or concrete can be used as long as the effects of the present invention are not substantially lost. For example, river sand, land sand, sea sand, crushed sand, quartz sand, river gravel, land gravel, crushed stone, artificial aggregate and the like can be used.
本発明のコンクリート打継ぎ部用グラウト組成物は、プレミックス材として使用する。従って、所定量の水を計量し混練するだけですぐに使用できるように、本発明のコンクリート打継ぎ部用グラウト組成物の配合成分のすべてが予め混合され、粉末状であるプレミックス製品とする。 The grout composition for concrete joints of the present invention is used as a premix material. Therefore, all of the blended components of the grout composition for concrete joints of the present invention are mixed in advance to obtain a premix product in a powder form so that a predetermined amount of water is measured and kneaded. .
本発明のコンクリート打継ぎ部用グラウト組成物の配合成分をプレミックス化させる方法は限定されず、Ｖ型混合機や可傾式コンクリートミキサ等の重力式ミキサー、ヘンシェルミキサー、リボンミキサー、パドルミキサー等で混合される。また、袋やポリエチレン製容器等の容器に直接、各材料を計り取り投入する方法により、本発明のコンクリート打継ぎ部用グラウト組成物をプレミックス化することもできる。 The method for premixing the blended components of the concrete joint grout composition of the present invention is not limited. Gravity mixers such as V-type mixers and tiltable concrete mixers, Henschel mixers, ribbon mixers, paddle mixers, etc. Mixed in. Moreover, the grout composition for concrete joint parts of the present invention can be premixed by a method of measuring and introducing each material directly into a container such as a bag or a polyethylene container.
本発明のプレミックスタイプのコンクリート打継ぎ部用グラウト組成物を用いて無収縮グラウトを製造するには、水／結合材比３０〜４５％で練り混ぜるのが好ましい。３０％未満の場合、超流動性と可使時間のバランスが取れず、良好なワーカビリティを維持することができず好ましくない。また、４５％を超えると、ブリーディングの発生や強度発現性が低下するので好ましくない。 In order to produce a non-shrink grout using the premix-type concrete joint grout composition of the present invention, it is preferably kneaded at a water / binder ratio of 30 to 45%. If it is less than 30%, the balance between superfluidity and pot life cannot be achieved, and good workability cannot be maintained, which is not preferable. On the other hand, if it exceeds 45%, the occurrence of bleeding and strength development are reduced, which is not preferable.
本発明における水／結合材比とは、結合材となるセメント、および膨張材または水硬性を有するセメント用混和材（シリカフューム、フライアッシュ、高炉スラグ微粉末など）の合計質量に対する水の質量である。また、該水の質量は使用するセメント混和剤等に含まれる水をも合わせた質量である。 The water / binder ratio in the present invention is the mass of water with respect to the total mass of cement as a binder and an admixture for expansion or hydraulic cement (silica fume, fly ash, blast furnace slag fine powder, etc.). . The mass of the water is the total mass of water contained in the cement admixture used.
本発明のコンクリート打継ぎ部用グラウト組成物は、上記水／結合材比で混練した場合ＪＰロート流下時間が６秒以下であり、超低粘性となる。本発明の無収縮グラウトを用いて施工すれば、先打ちコンクリートと後打ちコンクリートとの打継面に生じる隙間に注入ホースを通して打継ぎ部分に注入材を施工してもブリーディングが発生することが無く、かつ自己収縮ひずみが小さく、硬化収縮ひび割れを抑制し、安定した高い強度発現性を有する。また、常に安定した品質性能を保持し、部材コンクリートの間の一体化を図った構造物を提供できる。 When the grout composition for a concrete joint part of the present invention is kneaded at the above water / binder ratio, the flow time of the JP funnel is 6 seconds or less, and it has an ultra-low viscosity. If construction is performed using the non-shrink grout of the present invention, bleeding does not occur even if the injection material is applied to the joint portion through the injection hose in the gap generated on the joint surface between the precast concrete and the postcast concrete. In addition, the self-shrinkage strain is small, curing shrinkage cracking is suppressed, and stable high strength development is achieved. Moreover, the structure which always maintained the stable quality performance and aimed at integration between member concrete can be provided.
以下、本発明の実施例を比較例と共に示す。なお、本発明の範囲は以下の実施例に限定されない。 Examples of the present invention are shown below together with comparative examples. The scope of the present invention is not limited to the following examples.
〔実施例１・比較例１〕
使用材料を表１に示す。表１の材料を用い、ヘンシェルミキサーを用いて混合し、本発明のプレミックスタイプのコンクリート打継ぎ部用グラウト組成物（本発明品１〜８）を作製した。また、比較参考品として参考品（１〜１０）も同時に作製した。作成した各グラウト組成物の配合割合を表２に示す。各グラウト組成物は、グラウトハンドミキサーを用いて９０秒間、水と練り混ぜ、グラウト材料を作製した。圧縮強度試験以外の品質試験は何れも２０±３℃、湿度８０％以上の恒温室内で行った。なお、表２中の配合（％）は微量混和剤である消泡剤と発泡剤を外割り配合とし、合計１００％に調整している。
[Example 1 and Comparative Example 1]
The materials used are shown in Table 1. The materials shown in Table 1 were mixed using a Henschel mixer to prepare a premix type grout composition for concrete joints of the present invention (products 1 to 8 of the present invention). In addition, reference products (1 to 10) were also prepared as comparative reference products. Table 2 shows the blending ratio of each of the prepared grout compositions. Each grout composition was kneaded with water for 90 seconds using a grout hand mixer to prepare a grout material. All quality tests other than the compressive strength test were conducted in a temperature-controlled room at 20 ± 3 ° C. and a humidity of 80% or more. The blending (%) in Table 2 is adjusted to a total of 100% by using an anti-foaming agent and a foaming agent, which are minor admixtures, as an external blending.
表２の本発明品（１〜８）と参考品（２、５、７、８）のグラウト材料について、流動性およびワーカビリティ（可使時間の確保）を測定し評価した。各評価試験方法を以下に示す。
〔流動性〕土木学会コンクリート標準示方書ＪＳＣＥ Ｆ５３１「ＰＣグラウトの流動性試験方法」によるＪＰ漏斗流下時間の測定値。超高流動（超低粘性）の指標として、練り上がり直後のＪＰ流下時間が６秒以下とした。
〔ワーカビリティ（可使時間の確保）〕作業性は６０分後においても流動性を保持し、可使時間を確保する指標として、練り上がりから６０分後のＪＰ漏斗流下時間の測定値が８秒未満を○（良好）、８秒以上のものを×（不可）とした。
The grout materials of the present invention products (1 to 8) and the reference products (2, 5, 7, and 8) in Table 2 were measured and evaluated for fluidity and workability (ensured pot life). Each evaluation test method is shown below.
[Flowability] Measured value of JP funnel flow time according to JSCE F531 "PC grout fluidity test method". As an indicator of ultra-high flow (ultra-low viscosity), the JP flow time immediately after kneading was 6 seconds or less.
[Workability (securing the pot life)] The workability remains fluid even after 60 minutes, and the measured value of the JP funnel flow time after 60 minutes from the kneading is 8 as an index for securing the pot life. Less than a second was evaluated as ◯ (good), and 8 seconds or longer was evaluated as x (impossible).
流動性および作業性の試験結果を表３に示す。本発明の実施例は、何れも練り上り直後のＪＰ漏斗流下時間が６秒以下で流動性に優れており、かつ練り上りから６０分後のＪＰ漏斗流下時間も８秒以下であって、何れも流動性に優れており、十分な可使時間が確保され、作業性が良好であることが確認された。 The test results of fluidity and workability are shown in Table 3. In all the examples of the present invention, the JP funnel flow time immediately after the kneading is 6 seconds or less and the fluidity is excellent, and the JP funnel flow time 60 minutes after the kneading is 8 seconds or less. In addition, it was confirmed that the fluidity was excellent, sufficient pot life was secured, and workability was good.
一方、膨張材を９.０％混和した比較例１-１は、練り上り直後のＪＰ漏斗流下時間が７.７秒であって流動性に劣り、練り上りから６０分後までに締まりが認められた。セメント分散剤を０.１％混和した比較例１-２や水結合材比を２５％にした比較例１-３、増粘剤を０.１５％混和した比較例１-４は、練り上り直後のＪＰ漏斗流下時間が１０秒以上であって流動性に劣り、グラウト練り上がり後から６０分経過後では、著しく締まりが強く、作業性（可使時間）を確保できないことが確認された。 On the other hand, in Comparative Example 1-1 in which 9.0% of the expansion material was mixed, the JP funnel flow time immediately after kneading was 7.7 seconds, and the fluidity was poor, and tightening was recognized by 60 minutes after kneading. It was. Comparative Example 1-2 with 0.1% cement dispersant, Comparative Example 1-3 with a water binder ratio of 25%, and Comparative Example 1-4 with 0.15% thickener were kneaded. It was confirmed that the JP funnel flow time immediately after that was 10 seconds or more and inferior in fluidity, and after 60 minutes had passed after grout kneading, the tightening was remarkably strong and workability (pot life) could not be secured.
〔実施例２・比較例２〕
表２の本発明品（１〜８）と参考品（１、４、６、９）のグラウト材料について、材料分離抵抗性試験を実施した。評価試験方法を以下に示す。
〔材料分離抵抗性試験〕本発明のコンクリート内継ぎ部用グラウト組成物は、加圧注入することによりコンクリート内継ぎ部の間隙に注入されるため、材料分離抵抗性試験は低圧注入器シリンダーを用いた簡易型加圧ブリーディング試験により実施した。簡易型加圧ブリーディング試験は、コニシ社製「ボンドシリンダー工法低圧充填器」内に、予め濾紙をセットしておき、充填器内部にグラウト材を充填し、ゴム弾性を利用した加圧により強制的に排出されるグラウト材の加圧ブリーディング水量により、材料の分離抵抗性を検証する試験である。試験サンプル量３０ｍｌに対し、グラウト作製後から１時間経過後までに生じた加圧脱水量３ｇ未満を○（良好）、３ｇを超えるものを×（不可）とした。本試験における加圧値は、０．０６ＭＰaとした。
[Example 2 and Comparative Example 2]
A material separation resistance test was performed on the grout materials of the present invention products (1-8) and the reference products (1, 4, 6, 9) in Table 2. The evaluation test method is shown below.
[Material Separation Resistance Test] The grout composition for concrete joints of the present invention is injected into the gap of the concrete joints by pressure injection, so the material separation resistance test uses a low pressure injector cylinder. The simple pressure bleeding test was conducted. In the simple pressure bleeding test, filter paper is set in advance in the “Bond Cylinder Low Pressure Filler” manufactured by Konishi Co., Ltd., the grout material is filled inside, and forced by pressure using rubber elasticity. This test verifies the separation resistance of the material by the amount of pressurized bleeding water of the grout material discharged to the surface. Less than 3 g of pressure dehydration generated from the preparation of grout to 1 hour after the grouting was made ○ (good), and more than 3 g to x (impossible) with respect to 30 ml of test sample. The pressure value in this test was 0.06 MPa.
材料分離抵抗性試験の結果を表４に示す。本発明の実施例は、何れも加圧脱水量が３ｇ未満と少なく、材料分離抵抗性が高いことが確認された。膨張材を０.８％混和とした比較例２-１は、初期水和がやや劣り、加圧脱水量がやや多い３.２ｇの発生が認められた。セメント分散剤を２.１％混和した比較例２-２についても、加圧脱水量がやや多い３.８ｇの発生が認められた。また、水結合比４８％にした比較例２-３、および増粘剤を０.０１％混和した比較例２-４は、加圧脱水量が４ｇを超え、材料分離抵抗性が劣ることが認められた。 Table 4 shows the results of the material separation resistance test. In all of the examples of the present invention, the amount of pressurized dehydration was as small as less than 3 g, and it was confirmed that the material separation resistance was high. In Comparative Example 2-1 in which 0.8% of the expansion material was mixed, the initial hydration was slightly inferior, and the generation of 3.2 g with a slightly higher amount of pressure dehydration was observed. Also in Comparative Example 2-2 in which 2.1% of the cement dispersant was mixed, generation of 3.8 g having a slightly higher pressure dehydration amount was observed. In Comparative Example 2-3 in which the water bonding ratio is 48% and Comparative Example 2-4 in which 0.01% of the thickener is mixed, the pressure dehydration amount exceeds 4 g, and the material separation resistance is inferior. Admitted.
〔実施例３・比較例３〕
表２の本発明品（１〜８）と参考品（２、３、９）のグラウト材料について、圧縮強度試験を実施した。評価試験方法を以下に示す。
〔圧縮強度〕土木学会基準ＪＳＣＥ−Ｇ ５３１「ＰＣグラウトの圧縮強度試験方法」に準じ、材齢３、７、２８日の圧縮強度を測定した
[Example 3 and Comparative Example 3]
The compressive strength test was conducted on the grout materials of the present invention products (1-8) and the reference products (2, 3, 9) in Table 2. The evaluation test method is shown below.
[Compressive strength] Compressive strength was measured according to JSCE-G 531 “Test method for compressive strength of PC grout” at ages 3, 7, and 28 days.
圧縮強度試験の結果を表５に示す。本発明の実施例は、材齢３日で５０Ｎ/ｍｍ2以上の強度発現性を示し、材齢２８日では、９５Ｎ/ｍｍ2以上の超高強度が確認された。膨張材を９.０％混和した比較例３-１は、過膨張により材齢２８日強度は５１Ｎ/ｍｍ2と低い性状が確認された。早強セメント１０％混和し、低熱セメントを混和材料とした比較例３-２や発泡剤を０.００７％混和した比較例３-３においては、初期強度発現性が低く、材齢２８日強度も５０Ｎ/ｍｍ2以下の低い性状が確認された。 The results of the compressive strength test are shown in Table 5. The Examples of the present invention showed strength development of 50 N / mm 2 or more at a material age of 3 days, and an ultrahigh strength of 95 N / mm 2 or more was confirmed at a material age of 28 days. In Comparative Example 3-1 in which 9.0% of an expandable material was mixed, a low property of 51 N / mm 2 as a material having a material age of 28 days was confirmed due to overexpansion. In Comparative Example 3-2 mixed with 10% early strong cement and low heat cement as an admixture, and Comparative Example 3-3 mixed with 0.007% foaming agent, the initial strength development is low and the strength is 28 days old. Also, a low property of 50 N / mm 2 or less was confirmed.
〔実施例４・比較例４〕
本発明のコンクリート打継ぎ部用グラウト組成物について、より好ましいと思われるグラウト組成物（表２の本発明品４、５、６）と、表２の比較参考品（４、１０）について、初期膨張率および自己収縮試験を実施した。評価試験方法を以下に示す。
〔初期膨張率試験〕ＪＳＣＥ−Ｆ−５３３「ＰＣグラウトのブリーディング率および膨張率試験方法」に準じて、初期膨張率を測定した。
〔自己収縮試験〕ＪＣＩ基準ＪＣＩ−ＳＡＳ３「コンクリートの自己収縮応力試験方法（案）」に準じて、自己収縮ひずみを測定した。このとき、自己収縮ひずみの起点は始発時間とした。
Example 4 and Comparative Example 4
About the grout composition for concrete joints according to the present invention, the grout composition considered to be more preferable (the present invention products 4, 5, 6 in Table 2) and the comparative reference products (4, 10) in Table 2 Expansion and self-shrink tests were performed. The evaluation test method is shown below.
[Initial Expansion Coefficient Test] The initial expansion coefficient was measured according to JSCE-F-533 “PC Grouting Bleeding Ratio and Expansion Test Method”.
[Self-shrinkage test] Self-shrinkage strain was measured in accordance with JCI standard JCI-SAS3 "Concrete self-shrinkage stress test method (draft)". At this time, the starting point of the self-shrinkage strain was the initial time.
初期膨張率試験および自己収縮試験の結果を表６に示す。本発明の実施例は、初期膨張率が０.４〜０.６％の膨張を示し、自己収縮においても材齢１日で５〜約１００μmの膨張を示した。一方、発泡剤０.００７％を混和した比較例４-１は、初期膨張率が２.８％と過大膨張を示した。膨張材および発泡剤を混和していない比較例４−２は、初期膨張率は０.３％の収縮を示し、また自己収縮についても材齢１日で６５９μの大きな収縮が確認された。 Table 6 shows the results of the initial expansion coefficient test and the self-shrinkage test. The examples of the present invention exhibited an initial expansion rate of 0.4 to 0.6%, and also exhibited an expansion of 5 to about 100 μm at one day of age even in self-contraction. On the other hand, Comparative Example 4-1, which contained 0.007% of the foaming agent, exhibited an excessive expansion with an initial expansion rate of 2.8%. In Comparative Example 4-2 in which the expansion material and the foaming agent were not mixed, the initial expansion coefficient showed a shrinkage of 0.3%, and the self-shrinkage was confirmed to be a large shrinkage of 659 μ at one day of age.
本発明によれば、超低粘性の高流動で且つ作業時間が十分確保でき、材料分離抵抗性が大きく、圧縮強度８０Ｎ/ｍｍ2を超え且つ硬化時の自己収縮が起こり難くい無収縮グラウト組成物が得られるので、先打ちコンクリートと後打ちコンクリートとの打継面に生じる隙間に注入ホースを通して打継ぎ部分に注入材を施工しても容易に注入可能であり、ブリーディングが発生することが無く、かつ自己収縮ひずみが小さく適度な膨張性によって、コンクリート部材との一体化を図り、安定した高い強度発現性を有するプレミックス型のコンクリート打継ぎ部用グラウト組成物を提供することができる。 According to the present invention, an ultra-low-viscosity grouting composition that has a high flow with ultra-low viscosity, a sufficient working time, a high material separation resistance, a compressive strength of more than 80 N / mm 2 , and hardly undergoes self-shrinkage upon curing. Since the product is obtained, it can be easily injected even if an injection material is applied to the connecting part through the injection hose in the gap formed on the connecting surface between the precast concrete and the postcast concrete, and bleeding does not occur. In addition, it is possible to provide a premix-type grout composition for a concrete joint part that has a high self-shrinkage strain and an appropriate expansibility and that is integrated with a concrete member and has a stable and high strength.
Claims (5)
Mainly cement and containing 15% by mass or more of early-strength cement, 1.0 to 5.0% by mass of an expanding material, 0.01 to 0.1% by mass of a thickener, and 0.2 to 0.2% of a cement dispersant. A premix-type grout composition for a concrete joint, characterized by comprising 2.0% by mass and a foaming agent of 0.0005 to 0.005% by mass.
Early strength cement 20% by mass or more, expansion agent 2.0 to 4.5% by mass, thickener 0.02 to 0.06% by mass, cement dispersant 0.5 to 1.5% by mass, and foaming agent 0 The grout composition for concrete joints according to claim 1, which contains 0.0007 to 0.003 mass%.
The grout composition for concrete joints according to claim 1 or 2, further comprising 0.001 to 0.08% by mass of an antifoaming agent.
A non-shrinkage grout material for a concrete joint, wherein the grout composition according to any one of claims 1 to 3 is kneaded at a water / binder ratio of 30 to 45%.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2014109165A (en) * | 2012-12-04 | 2014-06-12 | Shigeaki Shoji | Method for forming concrete structure |
| JP2019085304A (en) * | 2017-11-07 | 2019-06-06 | 株式会社Ｓｅｒｉｃ Ｊａｐａｎ | Non-shrinkage grout composition, and non-shrinkage grout material |
| JP2019156701A (en) * | 2018-03-16 | 2019-09-19 | 太平洋マテリアル株式会社 | Grout composition and grout |
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| JP2002285152A (en) * | 2001-03-26 | 2002-10-03 | Mitsubishi Materials Corp | Premix type low viscous pc grout material |
| JP2004149362A (en) * | 2002-10-31 | 2004-05-27 | Taiheiyo Material Kk | Non-separating agent for admixing cement, admixture agent for nonshrink mortar and concrete containing non-separating agent, nonshrink mortar, and concrete |
| JP2005314154A (en) * | 2004-04-28 | 2005-11-10 | Taiheiyo Cement Corp | Admixture for grout |
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| JP2002285152A (en) * | 2001-03-26 | 2002-10-03 | Mitsubishi Materials Corp | Premix type low viscous pc grout material |
| JP2004149362A (en) * | 2002-10-31 | 2004-05-27 | Taiheiyo Material Kk | Non-separating agent for admixing cement, admixture agent for nonshrink mortar and concrete containing non-separating agent, nonshrink mortar, and concrete |
| JP2005314154A (en) * | 2004-04-28 | 2005-11-10 | Taiheiyo Cement Corp | Admixture for grout |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2014109165A (en) * | 2012-12-04 | 2014-06-12 | Shigeaki Shoji | Method for forming concrete structure |
| JP2019085304A (en) * | 2017-11-07 | 2019-06-06 | 株式会社Ｓｅｒｉｃ Ｊａｐａｎ | Non-shrinkage grout composition, and non-shrinkage grout material |
| JP2019156701A (en) * | 2018-03-16 | 2019-09-19 | 太平洋マテリアル株式会社 | Grout composition and grout |
| JP2022111343A (en) * | 2018-03-16 | 2022-07-29 | 太平洋マテリアル株式会社 | grout |
| JP7118527B2 (en) | 2018-03-16 | 2022-08-16 | 太平洋マテリアル株式会社 | grout |
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