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Effects of supplementary cementitious materials on pore-solution chemistry of blended cements
Supplementary cementitious materials (SCMs) are usually employed to replace partial cement and the pore-solution chemistry of blended cements is extremely essential for their cement hydration and durability. In this work, the pore-solutions of cement pastes with various water-to-cement (w/c) ratios and SCMs (fly ash, ground granulated blast-furnace slag and silica fume) are extracted for observing their ions and conductivities. The results illustrate that Na+, K+, OH−, Ca2+ and SO4 2− are the main and their concentrations are declined by the improving w/c ratios and SCMs dosages and thus decreasing their conductivities. The conductivity evolution shows three typical periods: induction (<5 h), acceleration (5 h-7d) and deceleration (>7d). The pore-solution conductivities of pastes with various w/c ratios are predicted well by the model established (R2 > 0.90) while the SCMs decline the model effectiveness. The OH−, K+ and SO4 2− provide the conductivities over 90% of the whole with the contributions in decreasing order.
Effects of supplementary cementitious materials on pore-solution chemistry of blended cements
Supplementary cementitious materials (SCMs) are usually employed to replace partial cement and the pore-solution chemistry of blended cements is extremely essential for their cement hydration and durability. In this work, the pore-solutions of cement pastes with various water-to-cement (w/c) ratios and SCMs (fly ash, ground granulated blast-furnace slag and silica fume) are extracted for observing their ions and conductivities. The results illustrate that Na+, K+, OH−, Ca2+ and SO4 2− are the main and their concentrations are declined by the improving w/c ratios and SCMs dosages and thus decreasing their conductivities. The conductivity evolution shows three typical periods: induction (<5 h), acceleration (5 h-7d) and deceleration (>7d). The pore-solution conductivities of pastes with various w/c ratios are predicted well by the model established (R2 > 0.90) while the SCMs decline the model effectiveness. The OH−, K+ and SO4 2− provide the conductivities over 90% of the whole with the contributions in decreasing order.
Effects of supplementary cementitious materials on pore-solution chemistry of blended cements
Qian, Rusheng (author) / Zhang, Yunsheng (author) / Liu, Cheng (author) / Liu, Zhiyong (author) / Zhang, Yu (author) / Liu, Guojian (author)
Journal of Sustainable Cement-Based Materials ; 11 ; 389-407
2022-11-02
19 pages
Article (Journal)
Electronic Resource
Unknown
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