INSTITUTO DE TECNOLOGIA EN POLIMEROS Y NANOTECNOLOGIA
Unidad Ejecutora - UE
Control of polymer modified cement's hydration rate by the addition of organically modified montmorillonites
TERESA M PIQUE; ANALIA VAZQUEZ
CEMENT & CONCRETE COMPOSITES
ELSEVIER SCI LTD
Lugar: Amsterdam; Año: 2013 vol. 37 p. 51 - 60
The addition of polyvinyl alcohol (PVA) in concrete causes a delay in the hydration rate of Portland cement paste. Three different montmorillonites (MMTs) (Cloisite Na, 30B, and Nanoﬁl) were previously mixed with PVA in order to control this delay. A comparison between the hydration rate of Portland cement paste and Portland cement paste modiﬁed with PVA and the different MMTs was made by means of semi-adiabatic calorimetry, thermal gravimetric analysis and contact angle measurements. Different rates of hydration were obtained with each MMT. The paste with PVA and Nanoﬁl behaves almost the same as the unmodiﬁed cement paste. Mechanical properties were also studied. An increase in the ﬂex- ural strength and a decrease in the compression strength were found, which is expected for a Portland cement paste modiﬁed with PVA. The addition of MMT to the cement paste with PVA hardly affects the mechanical properties.