地聚物骨料粒径对HS-ECC力学性能的影响  

Effect of Geopolymer Aggregate Particle Size on Mechanical Properties of HS-ECC

作　　者：张晋 贺曦文 郑怡 张耀庭[2] ZHANG Jin;HE Xiwen;ZHENG Yi;ZHANG Yaoting(School of Civil Engineering,Architecture and Environment,Hubei University of Technology,Wuhan 430068,China;School of Civil and Hydraulic Engineering,Huazhong University of Science and Technology,Wuhan 430074,China)

机构地区：[1]湖北工业大学土木建筑与环境学院,武汉430068 [2]华中科技大学土木与水利工程学院,武汉430074

出　　处：《硅酸盐通报》2023年第10期3489-3498,共10页Bulletin of the Chinese Ceramic Society

基　　金：国家自然科学基金(52178140)。

摘　　要：高强度工程水泥基复合材料(HS-ECC)中的精细硅砂骨料粒径通常小于0.30 mm,价格昂贵且不利于减少HS-ECC收缩,同时精细硅砂的开采和加工会对环境产生一定的负面影响。本文利用粒径在0.30~<4.75 mm的地聚物骨料(GPA)作为精细硅砂的替代骨料制备HS-ECC,GPA的粒径被划分为三组,分别为0.30~<1.18 mm、1.18~<2.36 mm、2.36~<4.75 mm,以研究各粒径区间对HS-ECC抗压强度、拉伸应变能力及微观结构的影响规律。结果表明:GPA粒径与石英砂骨料相同时,HS-ECC延性得到了显著提升,但对抗压强度及抗拉强度影响较小,平均裂缝宽度和平均裂缝间距均明显减小,GPA-水泥基质界面过渡区宽度大于石英砂-水泥基质界面过渡区宽度;GPA粒径不同时,HS-ECC的延性、抗压强度和抗拉强度均随GPA粒径的增大而减小,平均裂缝宽度和平均裂缝间距均随GPA粒径的增大而增大,GPA-水泥基质界面过渡区宽度随GPA粒径增大而减小。Fine silica sand aggregate particle size in high-strength engineered cementitious composites(HS-ECC)is usually less than 0.30 mm,which is expensive and not conducive to shrinkage reduction of HS-ECC,while the mining and processing of fine silica sand has some negative impact on the environment.In this paper,geopolymer aggregate(GPA)in the range of particle size 0.30~<4.75 mm was used as a replacement aggregate for fine silica sand to prepare HS-ECC.The particle size of GPA was divided into three groups,0.30~<1.18 mm,1.18~<2.36 mm and 2.36~<4.75 mm,to investigate the effect of each particle size interval on the compressive strength,tensile strain capacity and microstructure of HS-ECC.The results show that the ductility of HS-ECC is significantly improved when the particle size of GPA and silica sand is the same,but the effects on the compressive strength and tensile strength are smaller,the average crack width and average crack spacing are significantly reduced,and the width of GPA-cement matrix interface transition zone is larger than that of silica sand-cement matrix interface transition zone.When the particle sizes of GPA are different,the ductility,compressive strength and tensile strength of HS-ECC decrease with the increase of GPA particle size,the average crack width and average crack spacing increase with the increase of GPA particle size,and the width of GPA-cement matrix interface transition zone decreases with the increase of GPA particle size.

关 键 词：工程水泥基复合材料 地聚物骨料 骨料粒径 力学性能 界面过渡区 

分 类 号：TU528[建筑科学—建筑技术科学]