Optimization of cement and fly ash particle sizes to produce sustainable concretes
Optimization of cement and fly ash particle sizes to produce sustainable concretes
复制标题
DOI：
10.1016/j.cemconcomp.2011.04.008
复制
发表时间：
2011-09-01
影响因子：
10.5
通讯作者：
Guynn, John M.
中科院分区：
文献类型：
--
作者：
Bentz, Dale P.;Hansen, Andrew S.;Guynn, John M.
在生产更可持续的混凝土的过程中，从原材料成本和CO(2)足迹的角度来看，相当多的重点放在用更可持续的材料取代混凝土混合物中的水泥上。高容量粉煤灰混凝土被认为是实现水泥使用量大幅减少的一种潜在方法，但它们的使用有时受到早期强度降低和凝结时间急剧增加的阻碍。目前工业实践的一个限制是，硅酸盐水泥通常只针对其在纯水泥中的性能进行优化，而不是混合水泥。系统。本文提出了一种优化水泥和粉煤灰颗粒尺寸的新方法，以达到混合产品的预期性能。通过适当选择水泥和粉煤灰的粒径分布，在保持水泥中水的体积分数相同的情况下，粉煤灰替代水泥约35%，可获得等效的1 d和28 d强度，从而使水泥含量实际减少35%。Elsevier Ltd.出版。
In the drive to produce more sustainable concretes, considerable emphasis has been placed on replacing cement in concrete mixtures with more sustainable materials, both from a raw materials cost and a CO(2) footprint perspective. High volume fly ash concretes have been proposed as one potential approach for achieving substantial reductions in cement usage, but their usage is sometimes hampered by reduced early age strengths and dramatically increased setting times. One limitation of the current industry practice is that portland cements are generally only optimized for their performance in a pure cement, as opposed to a blended cement. system. In this paper, a new approach of optimizing the particle sizes of the cement and fly ash for achieving desired performance in a blended product will be presented. By appropriately selecting the particle size distributions of cement and fly ash, equivalent 1 d and 28 d strengths may be achieved with about a 35% volumetric replacement of cement with fly ash, while maintaining the same volume fraction of water in the mixture, thus providing an actual 35% reduction in cement content. Published by Elsevier Ltd.