Influences of Auxiliary Cementitious Materials on Strength and Technology of Prestressed High-Strength Concrete Pipe Piles

Abstract

Abstract: To optimize the production process of concrete pipe piles, silica fume (SF) and metakaolin (MK) were used as auxiliary cementitious materials. The influences of silica fume and metakaolin on the compressive strength of concrete under different steam curing time were studied.X-ray diffraction (XRD) and scanning electron microscope-energy dispersive spectroscopy (SEM-EDS) were used to analyze the hydration products and microstructure. The Box-Behnken test was designed by Design-Expert8.0 software, taking silica fume content, metakaolin content and steam curing time as independent variables, the compressive strength of steam curing concrete as the response value, to construct a multi-factor regression equation model. The results show that when the content of silica fume is 8% (mass fraction), the compressive strength slightly increases by 6.2% to 83.6 MPa; the content of metakaolin of 5%, 8% and 10% (mass fraction) improves compressive strength of steam curing concrete. When the steam curing time for 4 h, 8 h and 12 h, the increase of compressive strength of concrete with 10% metakaolin is 15.6%, 13.2% and 13.6% accordingly. The steam curing time of 4 h, 8 h and 12 h has little effect on the compressive strength of concrete. XRD and SEM-EDS results show that both silica fume and metakaolin consume Ca(OH)₂, which improves the early hydration degree of cement and the internal pore structure. The model established by the response surface method predicts that when the mass fraction of silica fume is 6.6%, the mass fraction of metakaolin is 10%, and the steam curing time is 8.6 h, the compressive strength of concrete is the highest with 104.8 MPa, and has a high degree of confidence.

Key words: concrete pipe pile, steam curing, silica fume, metakaolin, microstructure, Box-Behnken experimental design

CLC Number:

TU528

FAN Qi, DU Hongxiu, ZHAO Zhuang. Influences of Auxiliary Cementitious Materials on Strength and Technology of Prestressed High-Strength Concrete Pipe Piles[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(8): 2591-2599.

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