Abstract
The solution chemistry of Portland cement and C 3S pastes has been studied with particular attention to the concentrations of calcium and silicon in the aqueous phase during early stages of hydration. Results are discussed in relation to solubility data available from studies of OPC and C 3S pastes and from the CaOSiO 2H 2O system. It is shown that under normal conditions the concentration of silicon in solution is extremely low (<2ppm) and this remains unchanged even when hydration is accelerated in the presence of CaCl 2. However, retarding admixtures such as oxalic acid and EDTA, which are strong calcium binding agents, release a flush of silicon into solution within the first few minutes of hydration. The results lend support to the osmotic membrane model of cement hydration and also provide insight into the mechanisms by which accelerating and retarding admixtures function.
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