| INORGANIC MATERIALS AND CERAMIC MATRIX COMPOSITES |
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| Experimental Study on Mechanical Properties of Ultra-High Ductile Cementitious Composites |
WANG Yichao1, HOU Mengjun1, YU Jiangtao1,2, XU Shilang3, YU Kequan1,
ZHANG Zhigang4
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1 College of Civil Engineering, Tongji University, Shanghai 200092;
2 Shanghai Key Laboratory of Engineering Structure Safety, Shanghai 200032;
3 College of Civil Engineering and Architecture, Zhejiang University, Hangzhou 310058;
4 School of Civil Engineering, Chongqing University, Chongqing 400044; |
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Abstract To further enhance the tensile capacity of high performance cementitious composites, a new kind of cementitious material ultra-high ductility cementitious composites (UHDCC) based on cement mortar, is developed with the help of ultra high molecular weight polyethylene (PE) fibers. Uniaxial tension test, compression test and three-point bending beam test were conducted to explore the basic mechanical properties of UHDCC in this paper. The uniaxial tension test results indicated that UHDCC exhibited outstanding strain hardening behavior and the multiple cracking pattern. At the ultimate state, the crack spacing of UHDCC was generally less than 2 mm with the crack widths less than 200 μm. The average tensile strength of UHDCC was 7.28 MPa, while the average tensile strain capacity reached 12% (the maximal one more than 13%). The compressive test results showed that the compressive strains corresponding to the 80% and 60% of the peak compressive strength in post-peak branch reached about 2.8% and 7.0%, exhibiting the superior compressive ductility. The flexural toughness index I10, I30, I50 and I60 of UHDCC were 10.1, 33.1, 54.4 and 65.6 respectively, indicating the ultra-high deformability of UHDCC.Moreover, the 3-point bending notched beam test and single crack tension test results demonstrated that the high ductility of UHDCC originates from the ultra-high crack bridging capacity.
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Published: 22 November 2018
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2018, Vol. 32 
