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High-strength low-viscosity thickening type self-compacting concrete and preparation method thereof
The invention discloses high-strength low-viscosity thickening type self-compacting concrete and a preparation method thereof, and the concrete is prepared from the following components in parts by weight: 380 to 570 parts of cement, 210 to 300 parts of viscosity-reducing thickening type composite admixture, 550 to 710 parts of fine aggregate, 870 to 950 parts of coarse aggregate, 140 to 160 parts of mixing water and 12 to 17 parts of admixture, the viscosity-reducing and thickening composite admixture is formed by mixing silica fume, mineral powder, microbeads and superfine sand according to a certain proportion, and the admixture comprises a common polycarboxylic acid water reducing agent and a slow-release water reducing agent with release peak values different in time. The slump expansion degree of the high-strength low-viscosity thickening type self-compacting concrete can reach 750 mm or above, the expansion time T500 is controlled within 5 s, the slump retaining time is longer than 4 h, the viscosity is smaller than or equal to 35 Pa.s, and the compressive strength is larger than 100 MPa.
本发明公开了一种高强低粘增稠型自密实混凝土及其制备方法，所述混凝土按照重量份计，包括以下各组分：水泥380～570份、降粘增稠型复合掺合料210～300份、细骨料550～710份、粗骨料870～950份、拌合水140～160份、外加剂12～17份，所述降粘增稠型复合掺合料为硅灰、矿粉、微珠和特细砂按一定比例混合而成，所述外加剂包括普通聚羧酸减水剂和释放峰值不同时间的缓释型减水剂。本发明中高强低粘增稠型自密实混凝土坍落扩展度可达750mm以上、扩展时间T500控制在5s以内、保坍时间＞4h、粘度≤35Pa·s，抗压强度＞100MPa。
High-strength low-viscosity thickening type self-compacting concrete and preparation method thereof
The invention discloses high-strength low-viscosity thickening type self-compacting concrete and a preparation method thereof, and the concrete is prepared from the following components in parts by weight: 380 to 570 parts of cement, 210 to 300 parts of viscosity-reducing thickening type composite admixture, 550 to 710 parts of fine aggregate, 870 to 950 parts of coarse aggregate, 140 to 160 parts of mixing water and 12 to 17 parts of admixture, the viscosity-reducing and thickening composite admixture is formed by mixing silica fume, mineral powder, microbeads and superfine sand according to a certain proportion, and the admixture comprises a common polycarboxylic acid water reducing agent and a slow-release water reducing agent with release peak values different in time. The slump expansion degree of the high-strength low-viscosity thickening type self-compacting concrete can reach 750 mm or above, the expansion time T500 is controlled within 5 s, the slump retaining time is longer than 4 h, the viscosity is smaller than or equal to 35 Pa.s, and the compressive strength is larger than 100 MPa.
本发明公开了一种高强低粘增稠型自密实混凝土及其制备方法，所述混凝土按照重量份计，包括以下各组分：水泥380～570份、降粘增稠型复合掺合料210～300份、细骨料550～710份、粗骨料870～950份、拌合水140～160份、外加剂12～17份，所述降粘增稠型复合掺合料为硅灰、矿粉、微珠和特细砂按一定比例混合而成，所述外加剂包括普通聚羧酸减水剂和释放峰值不同时间的缓释型减水剂。本发明中高强低粘增稠型自密实混凝土坍落扩展度可达750mm以上、扩展时间T500控制在5s以内、保坍时间＞4h、粘度≤35Pa·s，抗压强度＞100MPa。
High-strength low-viscosity thickening type self-compacting concrete and preparation method thereof
一种高强低粘增稠型自密实混凝土及其制备方法
LYU JIWEI (author) / ZHU MINTAO (author) / WU YIFEI (author) / GAO SHUANGSHUANG (author)
2023-09-08
Patent
Electronic Resource
Chinese
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