Abstract
Many studies have been realised on polymer-modified mortars (PMMs). Among the polymers used, ethylene vinyl acetate (EVA) has revealed evident interaction between calcium ions and its acetate groups. Most of the studies have shown a positive impact of EVA on mortar performance, which is enhanced by the combination of the EVA with calcium oxide CaO. However, there is still a lack of understanding of the nature of these interactions and no clear link has been established between these interactions and the properties of the cementitious materials at early ages. This article aims to tackle this topic by focusing on the evolution of EVA particles in a pore solution and the properties of a cement modified with EVA and CaO, especially the rheological behaviour. As results, it is observed that the zeta potential of the pore solution decreases when EVA is added. Furthermore, the hydrodynamic radius of this polymer tends to increase over time in the pore solution. On the other hand, the EVA tends to delay the setting time while the CaO accelerates it. For the rheological state, EVA tends to govern the plastic viscosity of the cement paste while CaO governs the yield stress and these parameters are not affected by the mixing time during the first 100 min. Their combination enhances these rheological parameters.
Highlights
Organic polymers have been used as admixtures in mortars for more than five decades
This article aims to tackle this topic by focusing on the evolution of ethylene vinyl acetate (EVA) particles in a pore solution and the properties of a cement modified with EVA and calcium oxide (CaO), especially the rheological behaviour
EVA tends to govern the plastic viscosity of the cement paste while CaO governs the yield stress and these parameters are not affected by the mixing time during the first 100 min
Summary
Organic polymers have been used as admixtures in mortars for more than five decades. They are often used to enhance the performance, for instance in the field of repair and maintenance. Even though many studies testify about the improvement of repair mortars modified with polymers, early failure on repaired works remain. These failures currently appear as cracks in the repair mortar and/or its peeling off the substrate. Premature cracking of the repair mortar layer is often attributed to its shrinkage that occurs during cement hydration and its hardening
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