堆石混凝土强度随龄期发展规律研究OA

To investigate the development laws and differences in compressive strength of rock-filled concrete(RFC)and self-compac-ting concrete(SCC)with age,5 groups of RFC and SCC cubic specimens with a side length of 300 mm were prepared at different ages(7、14、28、56、90 d).The cubic compressive strength,failure modes and stress-strain curves of the two types of concrete at different ages were tested,compared and analyzed to explore the development laws and difference characteristics of their strength.The results show that with the increase of age,the overall deformation of RFC and SCC specimens at failure decreases gradually,and the compressive strength shows an increasing trend.At the same age,the compressive strength of RFC specimens is higher than that of SCC.With the increase of age,the failure resistance of both RFC and SCC is enhanced,and the compressive strength exhibits an exponential growth trend with age.The rock skeleton in RFC can effectively improve its compressive strength and elastic modulus.Among them,the compressive strength of RFC specimens at 7、14、56 d and 90 d reaches 60%、81.5%、137.8%and 158.7%of the 28 d strength,respectively,while the corre-sponding strengths of SCC specimens are 52.5%、65.4%、140.5%and 156.4%of the 28 d strength.At the same age,the compressive strength of RFC is higher than that of SCC.At 7、14、28、56 d and 90 d,the compressive strength of RFC increases by 18.3%、29.3%、3.7%、1.6%and 5.2%compared with SCC,respectively.The research results can provide a reference for strength prediction of rock-filled concrete in engineering construction.