The structure characteristics of hydrated calcium silicate synthesized by solution reaction method with the existing of water soluble polymer polyvinyl alcohol (PVA) are investigated. Using Na2SO3 and Ca(NO3)2 as the main raw materials, in the condition of 2%(in weight) addition of PVA and the water to solid ratio of 20, hydrated calcium silicate samples (Ca/Si=1.0 and 1.5) were prepared with 60 ℃ water bath. IR, BET, XRD and SEM methods were used to study the microstructure of the hydration products. The results showed that the addition of water soluble PVA did not alter obviously the amorphous structure characteristic of hydrated calcium silicate, but it had effects on the polymerization status of Si-O chain and the pore structure.The effects are somewhat obvious in the samples with the Ca/Si of 1.0.
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