Effect of Prewetted Ceramsite Content on Autogenous Shrinkage of Alkali-Activated Slag Concrete
In contract to ordinary Partland cement (OPC) concrete (OPCC), the water absorption and desorption process of prewetted ceramsite in alkali-activated slag (AAS) concrete (AASC) was investigated by using an U-tube mico-pressure measurement device.The investigation parameters include the type of cement (OPC and AAS) and prewetted ceramsite contents.Combined with the test results of pore structure, SEM and mechanical behavior (compressive strength, splitting tensile strength and elastic modulus), the effect of prewetted ceramsite contents on the autogenous shrinkage of AASC in 14 days was studied by a in-house corrugated pipe device.The results show that, compared with OPCC, the amount of water absorption and desorption of AASC is less, and the ratios of less harmful and harmless pores to total pore volume of AASC is significantly larger.Meanwhile in AASC there is no Ca(OH)2 that can restraint the autogenous shrinkage.Consequently, the autogenous shrinkage of AASC is larger than that of OPCC.Higher prewetted ceramsite contents improved the effect of internal curing, and reduced the autogenous shrinkage of AASC.The effect of prewetted ceramsite on the reduction of the autogenous shrinkage of AASC is slightly larger than that of OPCC.
combined activator ceramsite autogenous shrinkage alkali-activated slag concrete
D.D.Zheng T.Ji K.J.Cheng H.C.Wu
College of Civil Engineering, Fuzhou University, Fuzhou, Fujian 350116, China
国际会议
福州
英文
457-467
2018-11-04（万方平台首次上网日期，不代表论文的发表时间）