| This paper mainly studied the effect of standard curing, air curing, internal curing of recycled aggregate (RA) and super absorbent polymer (SAP) on compressive strength and carbonization resistance on fly ash concrete with water/cement ratio of0.45,0.40and0.35separately. Based on tests of compressive strength and accelerated carbonization, it studied the trends of compressive strength and carbonization resistance varying with different curing conditions and fly ash dosages, as well as the tendency of curing efficiency varying with different water/cement ratio. The test results indicated that:(1)There is slight reduction of compressive strength of concrete with less dosage of fly ash replacement by mass of cement and the reduction becomes more apparent with fly ash dosage of35%. However, with the addition of15%fly ash, the compressive strength of concrete with water/cement ratio of0.45increases a bit at standard curing condition.(2)Under the same curing condition, the relationship between he carbonization depth D and carbonization time T satisfies the general formula of D=Kt0.5, and the coefficient K increases with the increasing of fly ash dosage.(3)With same dosage of fly ash and RA internal curing, the results of the compressive strength and carbonization resistance of concrete are not good. While the method of SAP internal curing works much better for concrete with various water/cement ratios. Double mixing in RA and SAP maintenance effect only in low water-binder ratio has the best curing effect.(4)Under the same curing condition and with same fly ash dosage, the compressive strength and carbonization resistance of concrete decreases with the increasing of water/cement ratio. |
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