Research on Impermeability and Mechanism of SAP Internal Curing Pavement Concrete
In order to improve the impermeability of pavement concrete,super absorbent resin(SAP)is used for internal curing of pavement concrete.Chloride ion penetration test and splitting tensile strength test are designed to study the influence of different SAP parameters on the impermeability and splitting tensile strength of pavement concrete.At the same time,micro tests such as hydration heat test,hydration reaction degree test and scanning electron microscope(SEM)are designed,the effects of SAP parameters on the hydration process of cementitious materials and the microscopic morphology of concrete were investigated.The results showed that SAP significantly improved the impermeability and splitting tensile strength of concrete.The chloride ion migration coefficient of SAP curing concrete with 0.17％content decreased by 33.62％compared with the reference group,and the splitting tensile strength increased by 50.07％;the addition of SAP can effectively reduce the hydration heat release rate,reduce the heat release,delay the hydration process,and improve the degree of hydration reaction;SAP enhances the adhesion of cementitious materials and aggregates,significantly reduces the surface cracks of concrete,and at the same time promotes the secondary hydration of cementitious materials.A large number of hydration products are generated,which can fully fill the internal pores of concrete and SAP residual water release pores,and enhance the compactness of the slurry,thus improving the impermeability and other durability of concrete.
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