蒸汽养护下GBFS代砂高性能水泥基材料宏微观分析  

Study on the pore structure and mechanical properties of cement-based materials using GBFS as fine aggregate under the steaming curing

作　　者：石东升[1,2] 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;Key Laboratory of Civil Engineering Structure and Mechanics,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]内蒙古工业大学内蒙古自治区土木工程结构与力学重点实验室,内蒙古呼和浩特010051 [3]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》2021年第2期72-76,共5页Concrete

基　　金：国家自然科学基金资助项目(51868058,51268041);内蒙古自然科学基金(2018MS05011);内蒙古“草原英才”项目(CYYC5039)。

摘　　要：通过试验测定了蒸汽养护下不同龄期粒化高炉矿渣(GBFS)代砂高性能水泥基材料的抗压强度及孔隙结构特征,分析了抗压强度与空气含量、气泡平均弦长、间距系数和比表面积的关系。结果表明:石英砂高性能水泥基材料抗压强度略大于GBFS代砂高性能水泥基材料,但GBFS代砂高性能水泥基材料7~28 d的抗压强度增长速率要大于石英砂高性能水泥基材料。不管是GBFS代砂高性能水泥基材料还是石英砂与混合骨料高性能水泥基材料,空气含量、气泡间距系数和平均气泡弦长均与抗压强度呈现负线性相关;且在抗压强度与抗折强度相同时,GBFS代砂高性能水泥基材料的分形维数要大于石英砂高性能水泥基材料。粒化高炉矿渣骨料-胶凝材料过渡区要比石英砂胶凝材料过渡区更为致密,这是由于在过渡区产生新的水合物,且填补了过渡区的空隙。Through the experiment measured the compressive strength and microscopic characteristics parameters of granulated blast furnace slag(GBFS)high performance cement-based materials and quartz sand aggregate cement-based materials under steam curing,analyzing the relationship of air content,specific surface,spacing factor and average chord length and compressive strength.The results show that the compressive strength of quartz sand high performance cement-based materials is higher than that of GBFS high-performance cement-based materials,but the compressive strength growth rate of GBFS high-performance cement-based materials 7~28 d is higher than that of quartz sand high-performance cement-based materials.Whether it is GBFS high-performance cement-based materials or quartz sand high performance cement-based materials,air content,bubble spacing factor,average chord length are both negatively linearly related to compressive strength.When the compressive strength and the flexural strength are the same,the fractal dimension of the GBFS sand-based high-performance cement-based materials is greater than the fractal dimension of the quartz sand high-performance cement-based materials.The transition region of GBFS high-performance cement-based materials is denser than quartz sand high performance cement-based materials.This is due to the production of new hydrates in the transition region and filling the gaps in the transition region.

关 键 词：粒化高炉矿渣 高性能水泥基材料 蒸汽养护 抗压强度 孔隙结构 

分 类 号：TU528.064[建筑科学—建筑技术科学]