Abstract:Internal curing properties of lightweight aggregate modified with silane coupling agent(SCA) solution were investigated. Results indicate that the related internal curing properties of modified lightweight aggregate are affected by the concentration of SCA. With the mass fraction of SCA of 005% and 010%, the quality of interfacial transition zone between lightweight aggregate and cement paste can be further improved, shrinkage reducing efficiency of lightweight aggregate and mechanical properties of concrete are also enhanced. By using an appropriate concentration of SCA solution, the modified lightweight aggregate can reduce the shrinkage by regulating the internal humidity and increasing the resistance of structure, which is beneficial to increase the cracking resistance of concrete.