关键词: 水泥硬化体;(NH4)2SO4;溶解;动力学

Abstract: Cement based materials in service process is always confronted with corrosion source which come from the outside environment , and the corrosion of ( NH4 ) 2 SO4 is a kind of serious sulfate attack . The change of pH in aqueous solution was determined by analyzing the dissolution process of hardened cement paste in (NH4)2SO4 solution.The results show that the change of (NH4)2SO4 solution of harden cement paste powder is according to Avrami model which is increased with time , therefore relationship between the rate of dissolution of harden cement paste powder and the concentration of ( NH4 ) 2 SO4 solution is found .

Key words: hardened cement paste;( NH4 ) 2 SO4;dissolution;kinetic