Optimization of mix proportion and experimental analysis of mechanical properties of hybrid PVA-ECC
Qiao Zhi , Pan Zuanfeng , Meng Shaoping , Zhang Defeng , Liu Jiwei
DOI:
Received March 16, 2015,Revised , Accepted , Available online January 05, 2016
Volume ,2015,Pages 72-81
- Abstract
In order to reduce the production cost of Engineered Cementitious Composites (ECC), it is very necessary to substitute part of the expensive Japanese PVA fibers with the homemade PVA fibers for the ease of extensive application of the practical structures.Based on the ECC design theory, an optimal design for the fiber volume content of hybrid PVA-ECC is analyzed, taking both compressive strength and tensile strain capacity into account. The mechanical behavior of hybrid PVA-ECC is obtained through the four-point bending test and uniaxial compressive test. Experimental results indicate that the strain hardening and multiple cracking behavior of hybrid PVA-ECC are observed in the test, and the long-term compressive strength is distinctly increased. Furthermore, a modified inverse method based on the UM method is proposed, to use the measured data of four-point bending test to calculate the tensile strain capacity of ECC, and the proposed method is verified with the experimental results of hybrid PVA- ECC specimens.