Investigation on effect of mixture ratio on interfacialbonding properties of steel fibermatrix(PDF)
长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]
- Issue:
- 2020年6期
- Page:
- 57-66
- Research Field:
- 桥梁与隧道工程
- Publishing date:
Info
- Title:
- Investigation on effect of mixture ratio on interfacialbonding properties of steel fibermatrix
- Author(s):
- YUAN Ming1; LIANG En1; YAN Donghuang1; WEI Bingdeng1; LIU Yun1; 2; HUANG Lian1
- (1. School of Civil Engineering， Changsha University of Science and Technology， Changsha 410114， Hunan， China；2. School of Road and Bridge Engineering， Hunan Communication Polytechnic， Changsha 410132， Hunan， China)
- Keywords:
- bridge engineering; reactive powder concrete (RPC); singlesided pullout test; steel fiber; bond property; micro morphology
- PACS:
- -
- DOI:
- -
- Abstract:
- In order to study the influence of the relevant mix parameters of reactive powder concrete (RPC) materials on the interfacial bonding properties of steel fiberRPC matrix，six groups of matrix were made for singlesided pullout tested with three mix parameters as variables included silica fume，defoamer and average size of aggregate. According to the corresponding evaluation indexes，the measured data and the characteristics of the pull loadslip curve were compared and analyzed. The micro morphology of the steel fiber surface，the matrix tunnel after fiber was pulled out, the micro morphology of the matrix surface were observed by scanning electron microscope (SEM)，and the effect of the test parameters on the interfacial bonding properties of steel fiberRPC matrix was further discussed. The results show that silica fume has obvious influence on the interfacial bonding properties of steel fiberRPC matrix. The appropriate content of silica fume can greatly improve the average bond strength and equivalent bond strength of steel fiberRPC matrix，and the equivalent bond strength is reduced relative to the 20% silica fume content，when the content of silica fume (mass fraction, the same as below) increases to 30%. The addition of defoamer will not improve the interfacial bonding properties of steel fiberRPC matrix，but has adverse effects. With the addition of defoamer，the average bond strength of the matrix increases，but the equivalent bond strength decreases significantly. The SEM observation of the matrix tunnel after fiber was pulled out shows that there are hole defects in the tunnel，the number of large bubbles on the surface of the matrix decreases，while the number of small bubbles increases，and the distribution of small bubbles is more dense than the large bubbles. Keeping the cementsand ratio consistent，the average particle size of aggregate increases from 0.2 to 0.4 mm, and the particle size double，but the average bond strength and the equivalent bond strength has little change. The change of the average particle size of aggregate in the range of 0.2 to 0.4 mm has little effect on the interfacial bonding properties of steel fiberRPC matrix. It can provided a reference for the further study on the optimization of the interface properties and proportioning work of reactive powder concrete materials. 6 tabs, 13 figs, 25 refs.
Last Update: 2020-12-17