Effect of granite dust on mechanical and some durability properties of manufactured sand concrete
Effect of granite dust on mechanical and some durability properties of manufactured sand concrete
复制标题
花岗岩粉尘对机制砂混凝土机械性能和某些耐久性能的影响
DOI：
10.1016/j.conbuildmat.2016.01.034
复制
发表时间：
2016-04-15
影响因子：
7.4
通讯作者：
Yi, Zhonglai
中科院分区：
文献类型：
--
作者：
Li, Huajian;Huang, Fali;Yi, Zhonglai
人工砂的生产过程产生大量粉尘，不仅占用土地，污染环境，而且造成堤坝的破坏和坍塌。为了充分利用花岗岩粉，将其按不同比例掺入机制砂混凝土中作为辅助胶凝材料，替代粉煤灰。研究了这些混凝土的力学性能和某些耐久性性能。结果表明，通过引入花岗岩粉尘，机制砂混凝土的和易性得到改善。粉煤灰掺量为20%时，机制砂混凝土的早期强度随粉煤灰掺量的增加而降低，但后期抗压强度、抗折强度和弹性模量均有所提高。与纯水泥混凝土相比，改性混凝土56 d抗氯离子渗透性能显著提高。虽然电通量随花岗岩粉尘掺量的增加而增加，但始终处于低渗透水平。当花岗岩粉掺量在20%以内时，冻融循环350次后，动弹性模量仅略有下降，当掺量达到30%时，动弹性模量明显下降。与纯水泥混凝土相比，改性混凝土的干燥收缩在14 d内也得到了抑制。(C)2016爱思唯尔有限公司版权所有
The fabrication process of manufactured sands produces plenty of dust, which not only occupies the land and pollutes the environment but also causes dam breaks and collapses. To make full use of it, such granite dust was herein mixed into manufactured sand concrete as supplementary cementitious materials to replace fly ash in different proportions. The mechanical and some durability properties of these concretes were studied. The results showed an improvement in the workability of the manufactured sand concrete by introducing granite dust. The early strengths of manufactured sand concrete decreased with the fly ash replacement, but the compressive strengths, bending strengths and elastic modulus increased in the later stage when the replacement ratio was 20%. Compared with pure cement concrete, the 56 days chloride penetration resistance of the modified concretes was enhanced remarkably. Although the electric flux increased with the increasing granite dust dosage, it was always located at the low permeability level. The dynamic elastic modulus only had a slightly decrease after 350 freezing and thawing cycles when the granite dust dosage was within 20%, but it obviously dropped down when that dosage reached 30%. The drying shrinkage of the modified concrete was also inhibited within 14 days, compared with the pure cement concrete. (C) 2016 Elsevier Ltd. All rights reserved.