Durability of high volume fly ash concrete
Durability of high volume fly ash concrete
复制标题
大掺量粉煤灰混凝土的耐久性
DOI：
--
复制
发表时间：
2006
期刊：
影响因子：
--
通讯作者：
A. Camões
中科院分区：
文献类型：
--
作者：
A. Camões
众所周知，混凝土行业必须为建筑的可持续性作出贡献。为此，有必要在不影响混凝土结构耐久性要求的情况下减少水泥含量。因此，从整体生态和环境的角度来看，在混凝土副产品中大规模替代水泥将是非常有益的。在此背景下，开展了一项试验研究工作，重点是评估生产低硅酸盐水泥含量混凝土的可能性，包括当地的副产品，如飞灰和普通低成本骨料，而不需要任何预先处理。制备了三种不同掺量的混凝土混合料，并对其力学性能、工作性和耐久性进行了表征。所用胶凝材料总量分别为400 kg/m3、500 kg/m3和600 kg/m3，其中硅酸盐水泥占总胶凝材料质量的40%，粉煤灰占胶凝材料总量的60%。总体结果表明，这些混凝土的抗压强度要求总体上是满足的，并且具有很高的耐久性。因此，通过使用这种类型的混凝土，可以建造更耐用的结构，并有助于建筑的可持续性。
It is well known that the concrete industry has to contribute to the sustainability of construction. For this intent it is necessary to reduce the cement content without compromising the durability requirements of the concrete constructions. Therefore, large-scale cement replacement in concrete by by-products such as fly ash will be extremely beneficial from the overall ecological and environmental point of view. In this context, an experimental research work was carried out focused on the evaluation of the possibility of producing low portland cement content concrete with enhanced or even high performances, including local by-products such as fly ash and common low cost aggregates without any previous treatment, i. e., as received. Three different concrete mixtures (incorporating large quantities of fly ash) were made and their mechanical, workability and durability properties were characterized. The total binder used (400 kg/m 3 , 500 kg/m 3 and 600 kg/m 3 ) was composed by 40% of portland cement and 60% of fly ash by mass of the total cementitious material. The overall results obtained show that the compressive strength requirements, in general, are fulfilled and that these concretes are highly durable. Thus, by using this type of concrete it is possible to build more durable structures and contribute as well to the construction sustainability.