Abstract

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Title:: Effects of sealing curing agent on the paving performance of exposed aggregate concrete

Author(s):: CHEN Wei; HUANG Zhan-wei; SHEN Pei-liang; HAN Peng-fei; 1. School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, Hubei, China; 2. Wuhan Urban Development Real Estate Development Co. Ltd, Wuhan 430070, Hubei, China

Keywords:: road engineering; exposed aggregate concrete; sealing; curing agent; paving performance

Abstract:: A type of sealing curing agent for exposed-aggregate concrete pavement was developed in this study aiming at promoting the curing effects and durability of the concrete pavement. The effects of this sealing curing agent on the paving performance of exposed-aggregate concrete were investigated, and the strength, impermeability, abrasion resistance and carbonation rate of the exposed aggregate concrete were experimentally tested and analyzed by mechanical properties experiment, water absorption experiment, abrasion resistance experiment and anti-carbonation experiment. The enhancement mechanism of sealing curing agent was analyzed by employing SEM, XRD, DSC analytical techniques from the microcosmic point of view. The results show that the sealing curing agent can not only accelerate the degree of hydration reaction of cement in the exposed aggregate concrete and improve the microcosmic mechanical properties of the cement paste and interfacial transition zone, but also fill the micropores on the concrete surface and improve the density. Thereby it enhances the mechanical properties of exposed-aggregate concrete pavement as well as its permeability, abrasion resistance and anti-carbonation properties.