Mechanical Properties of VAE Latex Powder/Carbon Fiber Co-modified Concrete
To explore the hybrid modification effect of vinyl acetate-ethylene copolymer(VAE)latex powder and carbon fiber on mechanical properties of concrete and its mechanism,one kind of VAE latex powder modified concrete(VAEMC),three kinds of carbon fiber modified concrete(CFMC)and three kinds of VAE latex powder/carbon fiber co-modified concrete(VAE/CFMC)were prepared.Their resistivity and mechanical property were tested,and scanning electron microscope test and mercury intrusion porosimetry test were carried out.The results show that VAE latex powder can promote the dispersion of carbon fiber,and the resistivity of VAE/CFMC is lower than that of CFMC.Compared with CFMC,VAE/CFMC has better mechanical property,VAE latex powder and carbon fiber have positive hybrid effect.When VAE latex powder and carbon fiber are co-incorporation,the mechanical property of concrete is better than addition of the two components.VAE latex powder can improve the pore structure of CFMC,refine its pore size,reinforce the physical bond of carbon fiber/concrete matrix interface,and change the failure mode of carbon fiber from pull slip to pull break.
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