Effect of the addition of nanoclay and water soluble polymer to the Portland cement

TERESA MARÍA PIQUÉ

Kgs. Lyngby

Simposio; 8th fib International PhD Symposium in Civil Engineering; 2010

fib

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, SEM and thermogravimetric analysis TGA. FTIR spectroscopy and TGA were 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.