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A platform for research: civil engineering, architecture and urbanism
High-slump-loss-resistant rapid-hardening early-strength concrete and preparation method thereof
The invention provides high-slump-loss-resistant rapid-hardening early-strength concrete and a preparation method thereof.The high-slump-loss-resistant rapid-hardening early-strength concrete is prepared from, by weight, 100 parts of Portland cement, 10 parts of mineral powder, 132-138 parts of sand, 190-196 parts of gravel, 0.88-1.1 parts of a water reducing agent, 1.1-2.2 parts of an early-strength agent and 28-31.4 parts of water, the early strength agent is an additive which has the solid content of 40% and has coagulation-accelerating and non-water-reducing effects, and is formed by compounding calcium nitrate and calcium nitrite according to the mass ratio of 1: 1. The concrete effectively solves the contradiction between the working performance and the mechanical performance of the concrete, has the characteristics of good workability, small slump loss, short setting time, high early strength and good pumping performance, the slump of the concrete within 1 hour is greater than 200 mm, the expansion degree is greater than 400 mm, the slump loss within 1 hour is less than or equal to 20 mm, the compressive strength within 18 hours reaches 30 MPa or above, the compressive strength within 3 days reaches 50 MPa or above, the preparation method is simple, and the cost is low. The construction period can be effectively shortened, the requirements for rapid rush-repair and repair of roads, bridges, tunnels and the like are met, and the method is applied to engineering projects.
本发明提供一种高保坍快硬早强混凝土及其制备方法，所述高保坍快硬早强混凝土按照重量份计，包括以下各组分：硅酸盐水泥100份、矿粉10份、砂子132‑138份、碎石190‑196份、减水剂0.88‑1.1份、早强剂1.1‑2.2份、水28‑31.4份，所述早强剂为固含量40％且具有促凝非减水作用的外加剂，由硝酸钙与亚硝酸钙按1:1的质量比复合而成。本发明有效解决了混凝土工作性能和力学性能之间的矛盾，具有和易性好、坍落度损失小、凝结时间快、早期强度高、泵送性能好的特点，混凝土在1h内坍落度＞200mm、扩展度＞400mm，坍落度1h损失≤20mm，18h内的抗压强度达30MPa以上、3d抗压强度达到50MPa以上，且制备方法简单，能有效缩短工期，满足道路、桥隧等快速抢检抢修的要求，并已在工程项目上得到应用。
High-slump-loss-resistant rapid-hardening early-strength concrete and preparation method thereof
The invention provides high-slump-loss-resistant rapid-hardening early-strength concrete and a preparation method thereof.The high-slump-loss-resistant rapid-hardening early-strength concrete is prepared from, by weight, 100 parts of Portland cement, 10 parts of mineral powder, 132-138 parts of sand, 190-196 parts of gravel, 0.88-1.1 parts of a water reducing agent, 1.1-2.2 parts of an early-strength agent and 28-31.4 parts of water, the early strength agent is an additive which has the solid content of 40% and has coagulation-accelerating and non-water-reducing effects, and is formed by compounding calcium nitrate and calcium nitrite according to the mass ratio of 1: 1. The concrete effectively solves the contradiction between the working performance and the mechanical performance of the concrete, has the characteristics of good workability, small slump loss, short setting time, high early strength and good pumping performance, the slump of the concrete within 1 hour is greater than 200 mm, the expansion degree is greater than 400 mm, the slump loss within 1 hour is less than or equal to 20 mm, the compressive strength within 18 hours reaches 30 MPa or above, the compressive strength within 3 days reaches 50 MPa or above, the preparation method is simple, and the cost is low. The construction period can be effectively shortened, the requirements for rapid rush-repair and repair of roads, bridges, tunnels and the like are met, and the method is applied to engineering projects.
本发明提供一种高保坍快硬早强混凝土及其制备方法，所述高保坍快硬早强混凝土按照重量份计，包括以下各组分：硅酸盐水泥100份、矿粉10份、砂子132‑138份、碎石190‑196份、减水剂0.88‑1.1份、早强剂1.1‑2.2份、水28‑31.4份，所述早强剂为固含量40％且具有促凝非减水作用的外加剂，由硝酸钙与亚硝酸钙按1:1的质量比复合而成。本发明有效解决了混凝土工作性能和力学性能之间的矛盾，具有和易性好、坍落度损失小、凝结时间快、早期强度高、泵送性能好的特点，混凝土在1h内坍落度＞200mm、扩展度＞400mm，坍落度1h损失≤20mm，18h内的抗压强度达30MPa以上、3d抗压强度达到50MPa以上，且制备方法简单，能有效缩短工期，满足道路、桥隧等快速抢检抢修的要求，并已在工程项目上得到应用。
High-slump-loss-resistant rapid-hardening early-strength concrete and preparation method thereof
一种高保坍快硬早强混凝土及其制备方法
LYU ENLV (author) / ZHANG HAIFENG (author) / ZHU MINTAO (author) / WANG JUNHUA (author) / MIAO LONG (author) / GOU HONGXIANG (author) / BIAN CHENGHUI (author)
2022-03-25
Patent
Electronic Resource
Chinese
IPC:
C04B
Kalk
,
LIME
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