Effect of limestone powder on properties of concrete with different strength grades
Abstrac t:Replace fly ash and ultrafine fly ash with limestone powder of equal mass,and study the effect of the limestone powder replacement rate on the workability,compressive strength,and chloride ion penetration resistance of C30 and C80 concretes.The results show that for C30 concrete,when the replacement rate of limestone powder is 40％,it can improve the fluidity of the concrete.The 60 d compressive strength of the concrete increased by 5.8％compared to the control group,and the electric flux decreased by 46.1％compared to the control group.For C80 concrete,the addition of limestone powder reduces its 7,28d compressive strength.When the replacement rate of limestone powder is 100％,the 28 d compressive strength of the concrete decreased by 17.5％compared to the control group,and the electric flux increased by 21.2％compared to the control group.The addition of limestone powder has completely opposite effects on the compressive strength and chloride ion penetration resistance of C30 and C80 concretes.Limestone powder is more suitable for application in concrete with low strength grades,and the replacement rate should be 40％.
limestone powderworking preformancecompressive strengthchloride ion penetrationhigh-strength concrete
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维普
