1 School of Civil Engineering, Lanzhou University of Technology, Lanzhou 730050, China 2 Gansu Advanced Civil Engineering Materials Engineering Research Center, Lanzhou 730050, China 3 School of Materials Science and Engineering, Southeast University, Nanjing 211189, China
Abstract: In this work, the variation of working performance, compressive and flexural strength of machine-made sand concrete were studied through the changes in gelation composition such as tuff powder content (0%, 10%, 20%, 30%, 40%), tuff powder fineness (5.58%, 6.98%, 7.56% and 9.23%) and compound mixing of fly ash and mineral powder. SEM, XRD, NMR and other analytical techniques were used to study the hydration products and pore structure of tuff-mixed pulverized concrete. The test results show that as the amount of tuff powder increases, the slump of concrete increases first and then decreases, the compressive and flexural strength decreases, and the pore size increases greatly. The fineness of tuff powder has a slight effect on the working performance, compressive and flexural properties. The compound mixing of fly ash and mineral powder can improve the mechanical strength of concrete of 28 d and increase the number of small holes, but the number of large holes also increases due to the large gradation distribution of fly ash and mineral powder.
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2025, Vol. 39 
