Transition from Multiple Macro-Cracking to Multiple Micro-Cracking in Cementitious Composites  

作　　者：张君 冷冰 

机构地区：[1]Department of Civil Engineering,Tsinghua University

出　　处：《Tsinghua Science and Technology》2008年第5期669-673,共5页清华大学学报（自然科学版（英文版）

基　　金：the National Natural Science Foundation of China (No. 50178043)

摘　　要：This paper presents an experimental study of the possibility of transition from multiple macro-cracking to multiple micro-cracking in cementitious composites. Conventional polyvinyl alcohol fiber reinforced cementitious composites normally exhibit macroscopic strain-hardening and multiple cracking after the first cracks appear. However, the individual crack width at the saturated stage is normally 60 to 80 μm. In the current study, the effect of fine aggregate size on the cracking performance, especially the individual crack width in the strain-hardening stage was studied by bending tests. The results show that the individual crack widths can be reduced from 60-80 μm to 10-30 μm by modifying the particle size of the fine aggregates used in the composites.This paper presents an experimental study of the possibility of transition from multiple macro-cracking to multiple micro-cracking in cementitious composites. Conventional polyvinyl alcohol fiber reinforced cementitious composites normally exhibit macroscopic strain-hardening and multiple cracking after the first cracks appear. However, the individual crack width at the saturated stage is normally 60 to 80 μm. In the current study, the effect of fine aggregate size on the cracking performance, especially the individual crack width in the strain-hardening stage was studied by bending tests. The results show that the individual crack widths can be reduced from 60-80 μm to 10-30 μm by modifying the particle size of the fine aggregates used in the composites.

关 键 词：fiber reinforced cementitious composites crack width polyvinyl alcohol fibers 

分 类 号：TB332[一般工业技术—材料科学与工程]