Hydration evaluation of Portland cement modified with polyvinyl alcohol and nano clay

TERESA MARIA PIQUÉ; HUMBERTO BÁLZAMO; ANALIA VAZQUEZ

KEY ENGINEERING MATERIALS

Trans TEch Publishers

Año: 2011 vol. 166 p. 47 - 56

1013-9826

Polyvinylalcohol (PVA) is a polymer soluble in hot water, it has the property of film formation and it can improve concrete performance. The effects of PVA modified with nano clay on the cement hydration reaction have been investigated by means of semiadiabatic calorimeter, FTIR spectroscopy and SEM. FTIR spectroscopy was employed to monitor chemical transformation of cement. The morphology of the different samples was compared using SEM micrographs. With the semiadiabatic calorimeter the hydration kinetic was measured to compare the heat rate of the admixture materials. Fixing the water?cement ratio, w/c, in 0, 45, the ratio of polymer to cement, p/c, was 2 wt% and the ratio of clay to polymer was 4 wt%. The polymer and modified polymer admixtures produced a retardation effect on the kinetic of cement hydration. The increase of the temperature with time was measured and a new model with four parameters was employed.