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A platform for research: civil engineering, architecture and urbanism
Concrete mix proportion for immersed tube post-cast strip
The invention relates to a cement concrete preparation technology, in particular to a concrete mix proportion for an immersed tube post-cast strip. The concrete comprises the following components in parts by weight: 375-385 parts of a cementing material; 1760-1780 parts of mineral aggregate; 150-170 parts of water; 32-36 parts of an expanding agent; and 8-12 parts of a water reducing agent; wherein the weight percentage of magnesium oxide in the expanding agent is 90%-93%, and the weight percentage of calcium oxide in the expanding agent is 1.2%-2.2%. The performance of the concrete meets the requirements that the slump is 200 +/- 20 mm, the expansion degree is 450 +/- 50 mm, the initial setting time is more than or equal to 10 hours, the final setting time is more than or equal to 12 hours, the 28d compressive strength is more than or equal to C45, the volume weight is 2360 (-10 to +10) kg/m<3>, the 28d impermeability grade is more than or equal to P10, the 28d drying shrinkage is less than 320 [mu][epsilon], and the restrained expansion rate after curing in water for 28 days is greater than or equal to 0.015%.
本发明涉及一种水泥混凝土配置技术，特别是一种沉管后浇带用混凝土配合比。该混凝土包括如下重量份数的组分，胶凝材料375～385份；矿物骨料1760～1780份，水150～170份；膨胀剂32～36份；减水剂8～12份；所述膨胀剂中氧化镁的重量百分比为90％～93％，氧化钙的重量百分比为1.2％～2.2％。混凝土的性能满足坍落度200±20mm，扩展度450±50mm，初凝时间≥10h，终凝时间≥12h，28d抗压强度≥C45，容重为2360(‑10～+10)kg/m3，28d抗渗等级≥P10，28d干燥收缩＜320με，水中养护28天限制膨胀率≥0.015％。
Concrete mix proportion for immersed tube post-cast strip
The invention relates to a cement concrete preparation technology, in particular to a concrete mix proportion for an immersed tube post-cast strip. The concrete comprises the following components in parts by weight: 375-385 parts of a cementing material; 1760-1780 parts of mineral aggregate; 150-170 parts of water; 32-36 parts of an expanding agent; and 8-12 parts of a water reducing agent; wherein the weight percentage of magnesium oxide in the expanding agent is 90%-93%, and the weight percentage of calcium oxide in the expanding agent is 1.2%-2.2%. The performance of the concrete meets the requirements that the slump is 200 +/- 20 mm, the expansion degree is 450 +/- 50 mm, the initial setting time is more than or equal to 10 hours, the final setting time is more than or equal to 12 hours, the 28d compressive strength is more than or equal to C45, the volume weight is 2360 (-10 to +10) kg/m<3>, the 28d impermeability grade is more than or equal to P10, the 28d drying shrinkage is less than 320 [mu][epsilon], and the restrained expansion rate after curing in water for 28 days is greater than or equal to 0.015%.
本发明涉及一种水泥混凝土配置技术，特别是一种沉管后浇带用混凝土配合比。该混凝土包括如下重量份数的组分，胶凝材料375～385份；矿物骨料1760～1780份，水150～170份；膨胀剂32～36份；减水剂8～12份；所述膨胀剂中氧化镁的重量百分比为90％～93％，氧化钙的重量百分比为1.2％～2.2％。混凝土的性能满足坍落度200±20mm，扩展度450±50mm，初凝时间≥10h，终凝时间≥12h，28d抗压强度≥C45，容重为2360(‑10～+10)kg/m3，28d抗渗等级≥P10，28d干燥收缩＜320με，水中养护28天限制膨胀率≥0.015％。
Concrete mix proportion for immersed tube post-cast strip
一种沉管后浇带用混凝土配合比
ZHANG TAO (author) / CAI JIE (author) / ZHU CHENG (author) / OU WEISHAN (author) / LIU XUANYUAN (author) / WANG CHUANZHI (author) / SHI ZHIPENG (author) / CAI YUE (author) / XU ZEGUI (author) / TANG JIAN (author)
2021-04-16
Patent
Electronic Resource
Chinese
IPC:
C04B
Kalk
,
LIME
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