关键词: 碱式硫酸镁水泥;钢筋混凝土;疲劳性能;静力荷载

Abstract: In order to study the static and fatigue properties of basic Magnesium Sulfate cement reinforced concrete beams,specimens of the basic Magnesium Sulfate cement(BMSC)and ordinary portland cement(PO·C)were in strength grade of C30,C40 and C50 were prepared,respectively.The results show that the mid-span deflection of reinforced concrete specimen increases with the increase of static load.The ultimate bearing capacity of C40(BMSC)and C50(BMSC)is 33 kN and 38 kN,which increased by 73.7％and 81％,compared with C40(PO·C)and C50(PO·C)of 19 kN and 21 kN,respectively and which indicates that the high strength grade BMSC specimen has higher bearing capacity.Under the fatigue load,the deflection value of the specimen decreases with the increase of fatigue number.The fatigue cycle life of BMSC specimens with higher strength is more than that of PO·C specimens,and the higher the strength grade is,the more obvious.Furthermore,the BMSC specimen deflection is less than the PO·C specimen,which shows that the BMSC specimen has high rigidity and good resistance to deformation.The crack width of BMSC specimen under fatigue load consists of three stages which are rapid development stage,stable stage and failure stage.The basic magnesium sulfate cement can be used to make reinforced concrete members and the performance is more excellent.This article provide an important theoretical basis for the application of basic magnesium sulfate cement concrete in structural engineering on a large scale.

Key words: basic magnesium sulfate cement;reinforced concrete;fatigue property;static load