硅质岩活性细骨料混凝土性能试验研究  

Experimental study on properties of siliceous rock active fine aggregate concrete

作　　者：刘鲁强 黄卓杰 饶聪 顾业莲 黄小兵 LIU Lu-qiang;HUANG Zhuo-jie;RAO Cong;GU Ye-lian;HUANG Xiao-bing(Guangxi Institute of Water Resources Research,Guangxi Key Laboratory of Water Engineering Materials and Structures,Nanning 530023,China;Hohai University,Nanjing 211106,China)

机构地区：[1]广西壮族自治区水利科学研究院、广西水工程材料与结构重点实验室,南宁530023 [2]河海大学,南京211106

出　　处：《广西水利水电》2025年第2期1-5,共5页Guangxi Water Resources & Hydropower Engineering

基　　金：水利部重大科技项目(SKS-2022107)。

摘　　要：为探究双掺粉煤灰和减缩抗裂减水剂对硅质岩活性骨料碱活性抑制效果,进行了骨料碱活性分析、骨料矿物成分分析、混凝土力学性能研究和微观形貌研究。研究结果表明:双掺粉煤灰(粉煤灰掺量为30%)和减缩抗裂减水剂能够有效抑制硅质岩碱活性,硅质岩人工砂混凝土90 d的抗压强度、劈裂抗拉强度和弹性模量均比白云岩砂混凝土低,降幅分别为5%、6%、7%,粉煤灰的掺入降低了水泥浆体孔溶液中的碱浓度,改善了混凝土的孔结构,有效抑制了碱骨料反应的发生。In order to study the inhibitory effect of double blended fly ash and shrinkage reducing anti-cracking wa-ter reducing agent on the alkaline activity of siliceous rock active aggregate,analysis on alkali activity and mineral composition of aggregate as well as research on mechanical properties and micromorphology of concrete were con-ducted.The results of study demonstrate that doule blended fly ash with a fly ash content of 30%and shrinkage re-ducing anti cracking water-reducing agent can effectively inhibit the alkali activity of siliceous rock;the compres-sive strength,splitting tensile strength,and elastic modulus of siliceous rock artificial sand concrete at 90d are low-er than those of dolomite sand concrete,with a decrease of 5%,6%,and 7%respectively.The addition of fly ash re-duces the alkali concentration in the pore solution of cement slurry,improves the pore structure of concrete,and ef-fectively inhibits the reaction of alkali aggregate.

关 键 词：硅质岩人工砂 碱活性 抗压强度 劈裂抗拉强度 静压弹性模量 微观形貌 

分 类 号：TV43[水利工程—水工结构工程]