煤矸石混凝土耐久性的正交试验研究

Orthogonal experiment on durability of coal gangue concrete

为了开辟煤矸石在建筑大宗材料中的应用空间及拓展煤矸石"变废为宝"的新思路、新途径,以煤矸石替代碎石、粉煤灰,矿渣替代水泥配制煤矸石混凝土,采用正交试验法和综合平衡法得出了煤矸石混凝土的最佳配合比,分析了煤矸石混凝土的抗压强度及其经硫酸盐侵蚀后的强度损失、弹性模量及其经冻融后的损失量,最后对煤矸石混凝土进行了微观结构分析。试验结果表明:煤矸石混凝土经过硫酸盐侵蚀后强度影响不是太大。该成果突破了传统的煤矸石活化方法研究煤矸石,对其在道路工程、排水工程等方面的利用具有一定的参考价值。

To enable a wide application of coal gangue in building materials,and make coal gangue from waste into treasure,the gangue concrete is compounded by gangue which partial substitutes gravel and fly ash,and slag which partial substitutes cement.Orthogonal test method and comprehensive balance method are used to obtain an optimal mixture ratio of coal gangue concrete,to analyze the compressive strength of coal gangue and the strength loss,elastic modulus of coal gangue after sulfate erosion,and the loss of elastic modulus after freeze thawing.Also,the microstructure of coal gangue concrete is analyzed.The tests show that the impact of the strength of coal gangue concrete after sulfate erosion is not too great.The study is unique comparing with the traditional gangue activation method,which provides a useful reference in road and drainage engineering.