洗选煤矸石透水混凝土的制备及其性能研究  

Study on the Preparation and Properties of Pervious Concrete of Coal Gangue for Washing

作　　者：张亚鹏[1] 张凤娇 曹佳伟 冯胜雷 孟文清[1] ZHANG Yapeng;ZHANG Fengjiao;CAO Jiawei;FENG Shenglei;MENG Wenqing(School of Civil Engineering,Hebei University of Engineering,Handan 056038,China)

机构地区：[1]河北工程大学土木工程学院,河北邯郸056038

出　　处：《粉煤灰综合利用》2024年第6期1-5,共5页Fly Ash Comprehensive Utilization

基　　金：国家重点研发计划(2018YFC1903602-01);固废资源化利用与节能国家重点实验室开放基金(SWR-2019-008)。

摘　　要：用洗选煤矸石制备透水混凝土,通过设计三因素三水平正交试验,探究骨料级配、水灰比、骨胶比对试件性能的影响。结果表明:各因素对洗选煤矸石透水混凝土力学性能和透水性能的影响主次顺序一致,均为:水灰比>骨胶比>骨料级配;抗压强度和透水性能二者呈负相关;当洗选煤矸石细粗骨料比1∶1、水灰比0.32、骨胶比2.7时,28 d抗压强度最高可达12.11 MPa;界面过渡区(ITZ)内的CH和AFt晶体相对含量较多,为薄弱区,更易产生裂缝,此区域范围内水化反应程度较低;透水混凝土的孔隙率越大,冻融损伤程度越显著。Using washing coal gangue to prepare permeable concrete,a three factor three-level orthogonal experiment was designed to investigate the effects of aggregate gradation,water cement ratio,and bone cement ratio on the performance of specimens.The results show that the influence of all factors on mechanical properties and permeable properties of washing coal gangue pervious concrete is consistent in the order of water-cement ratio>bone glue ratio>aggregate gradation;There is a negative correlation between compressive strength and water permeability;When the proportion of fine aggregate of washing coal gangue is 50%,the water-cement ratio is 0.32,and the bone glue ratio is 2.7,the 28 days compressive strength can reach 12.11 MPa.The relative content of CH and AFt crystals in interface transition zone(ITZ)area is relatively large,indicating a weak area and a higher likelihood of cracking,suggesting a lower degree of hydration reaction in this region.The larger the porosity of pervious concrete is,the more significant the freeze-thaw damage degree is.

关 键 词：洗选煤矸石 透水混凝土 抗压强度 透水性能 抗冻性 

分 类 号：TU997[建筑科学—市政工程]