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| Experimental study on energy evolution of concrete with cold joints under uniaxial compression |
| LIANG Da1, QIN Yuan1*, KOU Jialiang2, WANG Yulong1, ZHOU Heng3, GENG Kaiqiang1 |
| 1. School of Water Conservancy and Hydropower, Xi′an University of Technology, Xi′an, Shaanxi 710048, China; 2. School of Civil Engineering and Architecture, Xi′an University of Technology, Xi′an, Shaanxi 710048, China; 3. Power China Northwest Engineering Co., Ltd., Xi′an, Shaanxi 710065, China |
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Abstract The compression failure process of concrete with cold joints is accompanied by the accumulation and dissipation of energy. Through uniaxial compression tests on concrete with cold joints under different pouring age intervals and different elastic modulus ratios, the influence of age intervals and elastic modulus ratios on the stress-strain curves, failure mode, strength and energy evolution was stu-died. The failure process of concrete with cold joints was studied from the angle of energy, and the stress-strain constitutive model of concrete with cold joints was established. The test results show that with the increase of elastic modulus ratio, the failure mode of concrete samples gradually changes from collaborative failure to layered failure mode. The stress-strain curve mainly goes through three stages: elastic stage, elastic-plastic stage and yield failure stage. The larger the elastic modulus ratio, the longer the age interval, and the more obvious the ″thin and tall″ curve appears. The larger the elastic mo-dulus ratio, the shorter the age interval. under uniaxial compression, the greater the elastic strain energy released by pre-peak concrete with cold joints, the greater the total energy, and the brittle failure characteristic after the peak is more obvious.
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Received: 01 December 2021
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