Transactions of Nanjing University of Aeronautics & Astronautics
Effect of Silica Fume on Early Performance of Precast Concrete with Early Strength Agents
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Abstract:
The effect of silica fume on the early performance of precast concrete with an early strength agent was investigated. The ternary compounding technique of silica fume， fly ash and early strength agent were used to examine the compressive strength， heat of hydration， hydration products， and microstructures of the precast concrete. The experimental results showed that the optimum amount of silica fume in the precast concrete was 9%. Silica fume filled the fine pores between the cement particles. However， the cement hydration was mainly influenced by the water-to-cement ratio and cement particle size. As the hydration reaction continued， silica fume provided more nucleation sites， and the characteristic volcanic ash reaction increased both the hydration degree and hydration rate of the early strength agent doped cementitious materials.
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TU528.31
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