Property and Pore Structure of Nano-SiO2 Modified High Volume Slag Powder-Cement Cementitious System

Abstract

Abstract: Using the strong pozzolanic activity of precipitation method nano-silica (PNS) to improve the early compressive strength and loose internal structure of the high volume slag powder-cement cementitious system. The influence of PNS on the compressive strength and the resistance to chloride ion permeability of high volume slag powder-cement cementing system were studied. The hydration products and pore structure of the system were analysed by XRD, TG-DSC and MIP. Research shows that with the increase of PNS content, the compressive strength of the specimens increases, especially the 7 d compressive strength. The strength of specimens with 5% (mass fraction, the same blow) PNS increases by 20%. The resistance to chlcride ion penetration capacity first increases and then decreaces. When PNS content is 3%, it reaches the optimal level, and its 28 d chloride ion diffusion coefficient is 44.8% lower than that without PNS. PNS can consume a large amount of Ca(OH)₂ in the early stage and generate more hydration products such as C-S-H gel, which makes the pore structure more compact and reduces the porosity. Incorporating PNS within the range also refines the pore size.

Key words: nano-SiO₂, high volume slag powder, resistance to chloride ion penetration, pore structure, compressive strength

CLC Number:

TU528

LIN Peitong, ZENG Yu, ZHAO Yonggang, LIU Jinhong, WANG Junfeng, LU Liulei. Property and Pore Structure of Nano-SiO₂ Modified High Volume Slag Powder-Cement Cementitious System[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(2): 384-391.

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Property and Pore Structure of Nano-SiO₂ Modified High Volume Slag Powder-Cement Cementitious System

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