Damage constitutive model and energy evolution characteristics of nano-SiO2-CaCO3 concrete
Nano-SiO2-CaCO3 was mixed into concrete,the compressive performance test of nano-SiO2-CaCO3 concrete was carried out,and the constitutive structure of nano-SiO2-CaCO3 reinforced concrete was analyzed based on the theory of damage mechanics and energy dissipation.The damage constitutive models of ordinary concrete and nano-SiO2-CaCO3 concrete were established.The results show that the effect of mixing nano-materials is better than that of single mixing nano-materials in improving the strength of concrete,and the maximum increase in strength is 31.46%.Mixing nano-materials significantly reduces the release rate of elastic strain energy of concrete and increases the total strain energy of concrete and dissipated energy,thereby improving the ductility and toughness of concrete.Based on the SEM microscopic test results,the mechanism of nano-materials on the reinforcement effect of concrete was revealed.
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