JP5537407B2 - 水硬性組成物用早強剤 - Google Patents
水硬性組成物用早強剤 Download PDFInfo
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- JP5537407B2 JP5537407B2 JP2010289286A JP2010289286A JP5537407B2 JP 5537407 B2 JP5537407 B2 JP 5537407B2 JP 2010289286 A JP2010289286 A JP 2010289286A JP 2010289286 A JP2010289286 A JP 2010289286A JP 5537407 B2 JP5537407 B2 JP 5537407B2
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- BDHFUVZGWQCTTF-UHFFFAOYSA-M sulfonate Chemical compound [O-]S(=O)=O BDHFUVZGWQCTTF-UHFFFAOYSA-M 0.000 description 1
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- 229910052905 tridymite Inorganic materials 0.000 description 1
- 150000004670 unsaturated fatty acids Chemical class 0.000 description 1
- 235000021122 unsaturated fatty acids Nutrition 0.000 description 1
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- Curing Cements, Concrete, And Artificial Stone (AREA)
Description
本発明の水硬性組成物用早強剤は、化合物(1)とアルカリ金属硫酸塩及びアルカリ金属チオ硫酸塩から選ばれる1種以上の無機塩Aとからなり、化合物(1)と無機塩Aのモル比が化合物(1)/無機塩Aで5/95〜45/55、水硬性組成物の短期早強性向上の観点から好ましくは10/90〜40/60、より好ましくは20/80〜40/60、更に好ましくは20/80〜30/70である。無機塩Aを2種以上用いる場合は、各無機塩のモル数の合計を無機塩Aのモル数としてモル比を計算する。化合物(1)と無機塩Aとをこの範囲のモル比で用いることで、養生なしに短期強度、例えばコンクリートを調製後8時間程度における水硬性組成物硬化体の強度を向上させることができる。
本発明では、本発明の水硬性組成物用早強剤と分散剤とを含有する水硬性組成物用添加剤組成物を提供することができる。本発明の水硬性組成物用添加剤組成物は、化合物(1)と、無機塩Aと、分散剤とを含有し、化合物(1)と無機塩Aのモル比が化合物(1)/無機塩Aで5/95〜45/55である。化合物(1)としては、8時間後の強度発現の観点から、グリセリンが好ましい。分散剤はリン酸エステル系重合体、ポリカルボン酸系共重合体、スルホン酸系共重合体、ナフタレン系重合体、メラミン系重合体、フェノール系重合体、リグニン系重合体等の用いることができるが、水硬性組成物硬化体の短期早強性向上の観点から、リン酸エステル系重合体及びポリカルボン酸系共重合体が好ましい。
R13、R14:水素原子又は−CH3
R15:水素原子又は−COO(AO)nX
A2:炭素数2〜4のアルキレン基
X1:水素原子又は炭素数1〜18のアルキル基
m’:0〜2の数
n’:2〜300の数
p’:0又は1の数
を示す。〕
R16、R17、R18:同一でも異なっていてもよく、水素原子、−CH3又は(CH2)rCOOM2であり、(CH2)rCOOM2はCOOM1又は他の(CH2)rCOOM2と無水物を形成していてもよく、その場合、それらの基のM1、M2は存在しない。
M1、M2:水素原子、アルカリ金属、アルカリ土類金属(1/2原子)、アンモニウム基、アルキルアンモニウム基又は置換アルキルアンモニウム基
r:0〜2の数を示す。〕
本発明は、上記本発明の水硬性組成物用早強剤と、水硬性粉体と、骨材と、水とを含有する水硬性組成物を提供する。
(1)モルタルの調製
表1に示す配合条件で、モルタルミキサー((株)ダルトン製 万能混合撹拌機 型式:5DM-03-γ)を用いて、セメント(C)、細骨材(S)を投入し空練りを10秒行い、目標スランプ21±1cm、目標空気連行量2±1%となるよう、水硬性組成物用添加剤組成物(固形分25重量%の水溶液として用いた)を含む練り水(W)を加え、低速回転にて60秒、更に高速回転にて120秒間本混練りした。なお、早強剤と分散剤のセメント100重量部に対する添加量(重量部)は表2〜9の通りであり、表2〜9に示す添加量となるように練り水に添加して用いた。
・細骨材(S):城陽産、山砂、FM=2.67、密度2.56g/cm3
・水(W):水道水
モルタルについて、以下に示す試験法にしたがって、脱型強度、スランプフローをそれぞれ評価した。評価結果を表2〜9に示した。
JIS A 1132に基づき、円柱型プラモールド(底面の直径:5cm、高さ10cm)の型枠に、二層詰め方式によりモルタルを充填し、20℃の室内にて気中(20℃)養生を行い硬化させ供試体を作製した。モルタル調製から8時間後又は24時間後に硬化した供試体を型枠から脱型し、JIS A 1108に基づいて供試体の圧縮強度を測定した。参考例2〜4は表3の条件で蒸気養生を行った。蒸気養生にはMARUI社製三連式恒温湿潤養生槽試験機を用いた。
前記の方法にて調製したモルタルを、JIS R 5201に基づき、直ちにフローコーンに2層詰めし、フローコーンを正しく上の方に取り去り、最大と認める方向と、これに直角な方向の長さを測定した。尚、JIS R 5201記載の落下運動は行っていない。
・グリセリン(EO1):グリセリン1モルにエチレンオキサイドを平均1モル付加した付加物
・分散剤(1):マイテイ21HP(花王(株)製、一般式(D1−1)で示される単量体と一般式(D1−2)で示される単量体とを構成単位として含むポリカルボン酸系分散剤)
・Na2SO4:142.04
・Li2SO4:109.95
・K2SO4:174.27
・Na2S2O3:158.11
・Na2CO3:105.989
・NaNO3:84.99
・(NH4)2SO4:132.14
・CaSO4:136.14
・グリセリン:92
・ジエチレングリコール:106.12
・エチレングリコール:62.07
・トリエタノールアミン:149.19
・カテコール:142.04
・グリセリン(EO1):120
・フルフリルアルコール:98.1
・グリセリン酸:106.077
・グリセロリン酸:172.074
・1,2−プロパンジオール:76.09
・3−アミノ−1,2−プロパンジオール:91.11
・3−メトキシ−1,2−プロパンジオール:106.12
Claims (8)
- 化合物(1)が、一般式(1)中のXがヒドロキシ基の化合物である、請求項1記載の水硬性組成物用早強剤。
- 請求項1又は2記載の水硬性組成物用早強剤と分散剤とを含有する水硬性組成物用添加剤組成物。
- 請求項1又は2記載の水硬性組成物用早強剤と、水硬性粉体と、骨材と、水とを含有する水硬性組成物。
- 化合物(1)と無機塩Aの合計量が、水硬性粉体100重量部に対し0.01〜10重量部である請求項4記載の水硬性組成物。
- 水硬性組成物を型枠に充填し硬化させる工程で、蒸気養生をしない請求項7記載の水硬性組成物の硬化体の製造方法。
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