A GENERAL REINFORCEMENT DEVELOPED TO CHANGE HYDRAULIC AND ALINITE INORGANIC MATERIALS INTO ULTRA-HIGH DUCTILE COMPOSITE
The conventional Engineered cementitious composites (ECC), which are known for their exceeding tensile deformability, are produced with Portland-cement (PC) based materials.Based on micromechanical design theory and using specially treated polyethylene (PE) fibers, the authors succeeded in developing ECCs composed with different types of cement-based materials, i.e., Sulphate Aluminum Cement (SAC), Magnesium Oxychloride Cement (MOC) and gypsum (GS).The authors introduce the mixture proportions of SAC based, MOC based and GS based ECC, as well as that of PC-ECC.The test results indicated that all four types of composites exhibited outstanding strain hardening behavior and saturated multiple cracking properties with the maximal crack width less than 100 μm under increasing tensile loadings.The averaged tensile strain capacity of the tested PC-ECC, SAC-ECC, MOC-ECC, and GS-ECC were 11.68%, 5.70%, 5.88%, 5.34%, corresponding to the peak tensile stress 5.70 MPa, 5.72 MPa, 6.12 MPa, and 3.69 MPa, respectively.Additionally, the test results showed that the compressive strength of PC-ECC, SAC-ECC, MOC-ECC, and GY-ECC were 65.86 MPa, 36.84 MPa, 27.47 MPa and 12.46 MPa.Meanwhile, when the compressive strength exceeded the peak, all four types of composites exhibited superior compressive deformability.This study reveals that the specially treated PE fibers has the possibility of becoming a general reinforcement for improving some hydraulic and alinite inorganic materials by changing their brittleness to high tensile deformability.
Engineered cementitious composites cementing material PE fiber strain hardening tensile capacity
Yichao Wang Jiangtao Yu Qingfeng Xu
College of Civil Engineering, Tongji University, Shanghai, China Shanghai key laboratory of engineering structure safety, Shanghai, China
国际会议
福州
英文
557-565
2018-11-07（万方平台首次上网日期，不代表论文的发表时间）