Influence of Water-Cement Ratio and Rubber Admixture on Mechanical Properties and Energy Evolution Law of Mortar
Cement mortar is prone to brittle cracking under pressure,and its deformability can be improved by the use of rubber granules to make high rubber mixing mortar which has excellent energy absorption effect and can effectively improve the deformation adaptability of mortar.In this work,the stress-strain curves during the compression process of mortar,the effects of water-cement ratio and rubber admixture on the strength and deformation capacity of mortar were investigated,and the energy evolution law was analyzed.The results showed 35％reduction in strength as the water-cement ratio increased from 0.3 to 0.5,and 84％reduction in strength as the rubber doping increased from 0％to 75％.With the in-crease of water-cement ratio and rubber doping,the modulus of elasticity decreased significantly,and the total energy from compression to de-struction decreased,which was transformed into elastic strain energy and dissipation energy.The trend was consistent with the mortar without rubber particles,with a significant correlation with axial compressive strength.Ultimate compressive strain was affected by both strength and rub-ber percentage the ultimate compressive strain decreased and then increased when rubber percentage increases from 0％to 75％.Rubber parti-cles could slow down energy dissipation,and the increase of water-cement ratio accelerated energy dissipation and made the specimen fail.The water-cement ratio and rubber percentage have a significant effect on the strength.High percentage of rubber particles has a significant improve-ment on the deformation capacity,delaying the energy dissipation,and effectively hindering the development of cracks.
万方数据
维普
