基于大掺量复合掺合料的高强混凝土性能研究  

Study on properties of high-strength concrete based on large dosage of compound mineral admixtures

作　　者：宋少民[1] 郭宇轩 SONG Shaomin;GUO Yuxuan(Green Building and Green City Key Technology Research and Application Innovation Team,Beijing Advanced Innovation Center for Future Urban Design,Beijing Key Laboratory of Building Structure and Environmental Remediation Functional Materials,Beijing University of Architecture and Architecture,Beijing 100044,China)

机构地区：[1]北京建筑大学、建筑结构与环境修复功能材料北京市重点实验室、北京未来城市设计高精尖创新中心、绿色建筑和绿色城市关键技术研究与应用创新团队,北京100044

出　　处：《混凝土》2024年第10期111-115,120,共6页Concrete

摘　　要：以较大掺量应用于高强混凝土的复合矿物掺合料为研究对象,通过对矿渣粉、石灰石粉等组分进行粉磨,结合各组分材料独特效应,以矿渣粉占比为70%固定值,与其他粉体材料按照一定比例进行复配,研发出两种以高活性、易流、降黏为特点的高强混凝土用复合掺合料(无硅灰型和含硅灰型)。两种复合掺合料以30%、40%、50%、60%掺量分别应用到C60、C70、C80、C90高强混凝土中,研究不同掺量的复合掺合料对高强混凝土性能的影响。结果表明:随着高强混凝凝土用复合掺合料掺量的提升,高强混凝土倒置坍落度筒排空时间明显降低,证明混凝土黏聚性明显改善。高强混凝土用复合掺合料在30%、40%掺量时,早期强度较高,且后期强度发展较大;达到50%掺量后,早期强度较低,长龄期强度仍可以满足要求。A large amount of composite mineral admixture applied to high-strength concrete as the research object,through the slag powder,limestone powder and other components of grinding,combined with the unique effect of each component material,slag powder proportion of 70%fixed value,and other powder materials in accordance with a certain proportion of compound.Two kinds of composite admixtures(silica fume-free type and silica fume-containing type)for high strength concrete are developed,which are characterized by high activity,high rheology and viscosity reduction.Two kinds of composite admixtures were applied to C60,C70,C80,C90 high-strength concrete at the dosage of 30%,40%,50%and 60%respectively.The influence of different dosage of composite admixtures on the performance of high-strength concrete was studied.The results show that the emptying time of inverted slump cylinder of high strength concrete decreases obviously with the increase of composite admixture content of high strength concrete,which proves that the cohesion of concrete is obviously improved.When the composite admixture of high strength concrete is 30%,40%,the early strength is higher,and the late strength development is larger;When the dosage reaches 50%,the early strength is low,but the longage strength can still meet the requirements.

关 键 词：复合掺合料 高强混凝土 降黏 力学性能 

分 类 号：TU528.01[建筑科学—建筑技术科学]