Firstly,the functions and features of filling admixtures and their developing trends at home and abroad were described and analyzed,as well as the market outlook and demands.Then the study examples of filling expansive agents,and set retarded and early strength agents were reported,in addition,their action mechanisms and application results were analyzed and explained.Finally,some unresolved problems of filling admixtures in engineering applications were submitted,such as the compatibility,the optimum mix a...