Experimental study on reinforced concrete large-eccentricity compressive column of basic magnesium sulfate cement concrete-in different curing conditions

摘要

Basic magnesium sulfate cement (BMS) has many advantages, such as early strength, high strength, resistance to water and corrosion resistance, and so on. In order to explore the difference in performance between BMS and conventional reinforced concrete (RC) large-eccentric columns, the experiments of eight BMS concrete columns, including their deflection, cracking, yielding, ultimate moments, and failure modes are studied. The results show that large-eccentric compression column of BMS concrete has 20% higher values of cracking load and the ultimate capacity compared with the conventional RC column. The curing relative humidity has no obvious effect on the eccentric compressive performance of BMS concrete columns. There is no obvious difference in the failure modes of BMS concrete columns and conventional columns under large-eccentric compression. In addition, with the increase of the strength of BMS concrete, the cracking moment and the eccentric compressive capacity for BMS concrete columns can be improved. The general eccentric compressive theory and current code provisions for eccentric compressive column design are modified in order to be applicable to eccentric BMS concrete columns.