Abstract
The effects of sodium citrate on the evolution of compressive strength and paste microstructure of self-compacting concrete (SCC) were experimentally studied. Hydration degree and rheology measurement were carried out to investigate the mechanism of strength development. The results show that the difference in compressive strength of SCC depends on the dosage of sodium citrate and varies at different hydration ages. The compressive strength of SCC is improved with the addition of 0.025% sodium citrate, while it gradually decreases with the increase of sodium citrate dosage. The total porosity and harmful pore content of hardened pastes with small dosage of sodium citrate is lower than that of control sample, whereas it is higher when the dosage of sodium citrate exceeds 0.1%. The influence of sodium citrate on the compressive strength and pore structure of SCC is much obvious at early hydration ages. The incorporation of suitable dosage of sodium citrate improves the initial viscosity and dispersion resistance of fresh SCC, thus improving its pore structure and enhancing its compressive strength.
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