密封养护剂对露石混凝土路用性能的影响

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

提出一种露石混凝土路面密封养护剂的设计方法,可提高路面的养护效果和耐久性。研究了养护剂对露石混凝土路面路用性能的影响规律,通过力学性能、吸水率、耐磨性、抗碳化等试验分析了露石混凝土路面的强度、抗渗性、耐磨度和碳化速率等性能。利用SEM、XRD、DSC热分析技术从微观角度分析了密封养护剂的增强机理。研究结果表明:密封养护剂可以提升露石混凝土中水泥的水化反应程度,提高水泥浆体和界面过渡区的微观力学性能,并可填充混凝土表面微观孔隙,提高密实度,从而提升露石混凝土的力学性能、抗渗性、耐磨性和抗碳化等性能。

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.4tabs,10 figs,15refs.