摘要
为了促进钢渣的资源化利用,解决钢渣因活性低而导致实际应用受阻的问题,本文以钢渣、偏高岭土和硅灰为掺合料,设计L_(9)(3^(3))正交表并制备胶砂试件,研究掺合料配比、总掺量和钢渣细度三个因素对胶砂试件力学性能的影响,筛选出最优的水平因素组合,并在此基础上制备钢渣基三元混凝土,对最优水平因素组合进行优化验证。结果表明:胶砂试件受掺合料总掺量的影响最大,最优水平因素组合为掺合料配合比1∶2∶2(硅灰∶钢渣∶偏高岭土),总掺量20%,钢渣细度D_(90)为147μm;同时,以最优水平因素组合设计的钢渣基三元混凝土,与钢渣单掺混凝土相比,3 d抗压强度提升了31.71%,7 d抗压强度提升了54.21%,28 d抗压强度提升了9.84%;与标准水泥混凝土相比,3 d抗压强度提升了4.68%,7 d抗压强度提升了15.88%,28 d抗压强度提升了5.71%,满足钢渣作为掺合料实际应用到混凝土中对强度的要求。
In order to promote the resource utilization of steel slag and solve the problem of practical application hindered by low activity of steel slag,this paper uses steel slag,metakaolin and silica fume as admixtures to prepare mortar specimens by an L_(9)(3^(3))orthogonal experimental design.The influences of admixture ratio,total admixture amount and steel slag fineness on the mechanical properties of mortar specimens are studied,and the optimal combination of horizontal factors is screened.Based on above,steel slag-based ternary concrete is prepared,and the optimal combination of horizontal factors is optimized and verified.The results show that the mortar specimens are most affected by the total admixture amount,and the optimal combination of horizontal factors is 1:2:2(silica fume:steel slag:metakaolin)with the total admixture amount of 20%and the steel slag fineness of D_(90) is 147μm.At the same time,compared with steel slag concrete with single admixture,the compressive strength of steel slag-based ternary concrete designed with optimal horizontal factors increases by 31.71%at 3 days,54.21%at 7 days,and 9.84%at 28 days.Compared with standard cement concrete,the compressive strength increases by 4.68%at 3 days,15.88%at 7 days,and 5.71%at 28 days,which meets the strength requirements for steel slag as an admixture in practical application to concrete.
作者
梁潇潇
刘朝勇
李昕科
杨值宾
孙晋睿
熊惠明
刘爱平
王维清
LIANG Xiaoxiao(School of Environment and Resources,Southwest University of Science and Technology,Mianyang 621010,Sichuan,China)
出处
《水泥》
CAS
2024年第9期93-97,88,共6页
Cement
基金
大学生创新创业训练计划资助项目(S202310619073)。
关键词
三元混凝土
钢渣
硅灰
偏高岭土
正交试验
力学性能
ternary compound concrete
steel slag
silica fume
metakaolin
orthogonal experiment
mechanical property
