GBFS代砂水泥基材料孔结构与抗压强度关系的试验  

Experiment of the relationship between pore structure and compressive strength of the cement-based materials using granulated blast furnace slag as fine aggregate

作　　者：石东升[1] 李科 薛欣欣 韩佳彤 SHI Dongsheng;LI Ke;XUE Xinxin;HAN Jiatong(School of Civil Engineering,Inner Mongolia University of Technology,Hohhot 010051,China;Municipal Engineering Service Center of Hohhot,Hohhot 010020,China)

机构地区：[1]内蒙古工业大学土木工程学院,内蒙古呼和浩特010051 [2]呼和浩特市政工程服务中心,内蒙古呼和浩特010020

出　　处：《混凝土》2020年第12期142-146,共5页Concrete

基　　金：国家自然基金项目(51868058,51268041);内蒙古自然基金(2018MS05011);内蒙古草原英才(CYYC5039)。

摘　　要：通过试验分别测定了粒化高炉矿渣(GBFS)和石英砂作为细骨料时的水泥基材料的抗压强度及孔隙率和孔隙分布,分析了GBFS代砂水泥基材料孔结构与抗压强度之间的关系。结果表明:粒化高炉矿渣细骨料水泥基材料的抗压强度略低于石英砂水泥基材料,而混合细骨料水泥基材料的抗压强度略高于石英砂水泥基材料,但粒化高炉矿渣代砂水泥基材料抗压强度发展规律与普通石英砂水泥基材料相近。相同条件下粒化高炉矿渣代砂水泥基材料的孔隙率与中值孔径大于石英砂水泥基材料。在养护条件相同时,GBFS细骨料水泥基材料的孔隙率与中值孔径随着水胶比的增加而增大。水泥基材料的抗压强度随孔隙率的增大而减小,且孔隙尺寸越大数量越多水泥基材料的抗压强度越小。普通石英砂和粒化高炉矿渣细骨料水泥基材料的抗压强度和孔隙率的关系均很好地符合Powers、Ryshkevitch及Schiller计算式,且粒化高炉矿渣细骨料水泥基材料内部孔隙结构要比石英砂水泥基材料复杂。Through the experiment measured in the granulated blast furnace slag and quartz sand as fine aggregate cement-based materials compressive strength and pore distribution and porosity,analyzes the influence of pore structure on the compressive strength.The results show that the compressive strength of the GBFS fine aggregate cement-based materials is lower than that of quartz sand cement-based materials,and the compressive strength of the mixed fine aggregate cement-based materials is higher than that of quartz sand cement-based materials.However,the development law of compressive strength of cement-based materials using granulated blast furnace slag as fine aggregate are similar to that of cement-based materials using quartz sand as fine aggregate.Under the same conditions,the porosity and median pore diameter of the GBFS fine aggregate cement-based materials are larger than those of quartz sand cement-based materials.And the porosity and median pore diameter of the GBFS fine aggregate cement-based material increase with the increase of the water binder ratio.The compressive strength of the cement-based materials decreases with the increase of the porosity,and the larger the pore size,the smaller the compressive strength of the cement-based materials.The relationship between compressive strength and porosity of ordinary quartz sand cement-based materials and GBFS fine aggregate cement-based materials are in good agreement with Powers,Ryshkevitch and Schiller calculations,and the inte rnal pore structure of GBFS fine aggregate cement-based materials are more complicated than quartz sand cement-based materials.

关 键 词：粒化高炉矿渣 水泥基材料 抗压强度 孔结构 

分 类 号：TU528.01[建筑科学—建筑技术科学]