文档介绍：简述粉煤灰混凝土性能
【摘要】随着现代科学技术的发展与进步,目前建筑物越来越向高层大跨度发展。对混凝土性能的要求也越来越高。提高混凝土的强度和性能,以便能够提高结构的承载力、减轻结构的自重和提高建筑物的使用寿命,是当前混凝土发展需要。本文在粉煤灰混凝土中主要讲解了粉煤灰在混凝土中的应用、品质要求以及粉煤灰混凝土抗冻性能;然后,在这些理论基础知识上,根据粉煤灰混凝土的配制特点和要求,采用“普通硅酸盐水泥+FDN+粉煤灰”这一“双掺”路线,测定在同一水胶比、不同掺量下28天的抗压强度和混凝土的抗冻融性能。结果表明:混凝土掺加粉煤灰后影响到混凝土的引气量和水泥的水化程度,粉煤灰混凝土早期强度发展比较慢,因此粉煤灰混凝土早期抗冻性能相比普通混凝土是比较差的。
【关键词】:粉煤灰; 粉煤灰混凝土; 高效减水剂; 抗压强度; 抗冻融性
【ABSTRCT】:With modern science and technology development and progress, more and more buildings to the high-level large-span development. On concrete performance requirements are also getting higher and higher. Concrete improve the strength and performance, so as to improve the structure of the bearing capacity, reducing the structure of self-respect and enhance the life of buildings, concrete is the current development needs. In this paper, fly ash concrete in the main on the fly ash in concrete applications, quality and performance of fly ash concrete antifreeze and then, in these theoretical foundation of knowledge, in accordance with the preparation of fly ash concrete characteristics and requirements, Use of "ordinary portland cement fly ash + FDN +" this "double-doped" line of the same water-cement ratio, 28 days under different content and pressive strength of concrete anti-freeze-thaw performance. The results showed that: concrete admixtures after the impact of fly ash to the concrete with the gas and cement