摘要
以偏高岭土基复合掺合料为研究对象,研究其对混凝土工作性能和力学性能的影响,并利用Dinger-Funk方程进行颗粒紧密堆积分析。结果表明:偏高岭土与粉煤灰、矿渣粉复合优化可以改善单掺偏高岭土混凝土体系的流动性,降低混凝土流动性的经时损失;偏高岭土基复合掺合料对混凝土强度的贡献由大到小依次为偏高岭土-矿渣-粉煤灰三掺、偏高岭土-粉煤灰双掺、偏高岭土-矿渣粉双掺;等量取代25%水泥时,偏高岭土基复合掺合料以偏高岭土7.5%~10%、粉煤灰和矿粉15%~17.5%为最佳掺比范围;偏高岭土与粉煤灰、矿渣粉复合优化体系的1~10μm粒径分布与Dinger-Funk方程中的紧密堆积模型曲线基本吻合。
Taking metakaolin-based composite additive as the research object,the influence of such additive on the working performance and mechanical properties of concrete was studied.The Dinger-Funk equation was used to analyze the particle compact packing.The results show that the composite optimization of metakaolin with fly ash and slag powder can improve the fluidity of the concrete system with only metakaolin,and reduce the fluidity loss of concrete.The contribution of metakaolin-based composite additive to the concrete strength was the following:metakaolin slag-fly ash three combined mixing,metakaolin-fly ash double combined mixing,metakaolin-slag powder double combined mixing.When 25%cement is replaced by the same amount,7.5%~10%metakaolin and 15%~17.5%fly ash and mineral powder are the optimal mixing ratios.The particle size distribution of 1~10μm in the composite optimization system of metakaolin,fly ash and slag powder was basically consistent with the Dinger-Funk equation compact packing model curve.
作者
李世华
梁丽敏
马敏超
王俊杰
曹宝
LI Shihua;LIANG Limin;MA Minchao;WANG Junjie;CAO Bao(Yunnan Construction Investment Holding Green and High Performance Concrete Co.,Ltd.,Kunming,Yunnan 650501,China;Yunnan Engineering Research Center of High Performance Concrete,Kunming,Yunnan 650501,China)
出处
《建筑施工》
2019年第10期1939-1942,共4页
Building Construction
基金
云南省科技富民强县计划项目（2014EA004）
关键词
偏高岭土
复合掺合料
混凝土工作性能
抗压强度
紧密堆积
metakaolin
composite additive
working performance of concrete
compressive strength
compact packing
