Frost Resistance of Hydraulic Concrete with Different Mineral Admixtures
To study the frost resistance of hydraulic concrete,concrete samples were prepared with different mineral admixtures(fly ash,limestone powder and mineral powder).The changes in mass,compressive strength and dynamic elastic modulus of concrete under different numbers of freeze-thaw cycles were analyzed,and the changes in internal pores were acquired by CT scanning to allow a comprehensive study of the frost resistance of hydraulic concrete.The results show that the optimized blending method uses the addition of limestone powder and fly ash(LFC),effectively improving the frost resistance of concrete.After 150 freeze-thaw cycles,the compressive strength remains 68.64%,the relative dynamic elastic modulus is 79.81%,and the porosities are close to that of the reference concrete(NC)by industrial CT scanning with 0.881%and 0.865%,respectively.However,the volume proportion of medium and large pores in LFC is better than that of NC,and the pore structure was also superior.
mineral admixturehydraulic concretefrost resistanceCT scanning
万方数据
维普
