Author/Authors :
tahiri, n. université de lille - imt lille douai, research center of ecole des mines de douai, Douai, France , tahiri, n. cadi ayyad university - faculty of sciences semlalia - department of chemistry, Marrakech, Morocco , khouchaf, l. université de lille - research center of ecole des mines de douai, imt lille douai, Douai, France , elaatmani, m. cadi ayyad university - faculty of sciences semlalia - department of chemistry, Marrakech, Morocco , zegzouti, a. cadi ayyad university - faculty of sciences semlalia - department of chemistry, Marrakech, Morocco , daoud, m. cadi ayyad university - faculty of sciences semlalia - department of chemistry, Marrakech, Morocco
Abstract :
In this study, the structural changes of natural SiO_2 aggregate at the nanometric scale during the attack by the alkali-silica reaction (ASR) are followed. The effect of the bentonite as a partial substitution of the cement in concrete is investigated. The samples are analyzed by X-ray diffraction (XRD), Infrared spectroscopy (IR), transmission electronic microscopy (TEM) and Energy Dispersive Spectrometer (EDX). The structural changes that occur in the aggregate at different times of ASR were well highlighted at the nanometric scale. The X-ray diffraction and infrared spectroscopy analysis showed that the reactivity of the aggregate decreases with the presence of the bentonite. This result allowed us to conclude that partial substitution of the bentonite in the concrete is effective against expansion by the ASR.
Keywords :
Alkali–silica reaction , Aggregate , Concrete , Bentonite , Durability
