Abstract
Nowadays, the major concern of professionals in the field of building materials is to improve the properties induced by the addition of different additives (polymers) and mineral additions (Supplementary Cement Materials SCMs) and to eventually adapt them to a particular application. This race towards performance has resulted in mortar formulations that are increasingly complex and rich in diversified additions. This is an industry-friendly practice since it generally yields a mortar modified by the combination of a polymer and SCMs, at low cost and low environmental impact, with an improved sustainability in the long term. In order to improve the durability of SCM-modified repair mortars, it seemed interesting to evaluate the influence of adding the styrene polyacrylic (SPA) Latex on the properties of these mortars when exposed to aggressive media such as acids. Composite mortars based on pozzolanic mineral additions, containing different levels of 0.5%, 1% and 2%w latex, were stored in acid solutions, for various periods of immersion. The analysis of the microstructure of these mortars, after exposure to acid attack, was carried out by FTIR spectroscopy. The results obtained allowed to demonstrate the beneficial effect of adding the SPA polymer and the pozzolanic additions to the modified materials and to show their improved resistance to acid attacks, such as HNO3 and H3PO4 solutions at 8%. The best durability properties of the mortars modified by the combination of the polymer and the additional cementitious materials observed in this study indicate a longer service life of the repaired structure when using this type of Latex-modified repair materials.
Highlights
Au cours de ces dernières décennies la formulation des mortiers composites a été profondément modifiée par l’introduction de multiples adjuvants [1]
In order to improve the durability of SCM-modified repair mortars, it seemed interesting to evaluate the influence of adding the styrene polyacrylic (SPA) Latex on the properties of these mortars when exposed to aggressive media such as acids
The results obtained allowed to demonstrate the beneficial effect of adding the SPA polymer and the pozzolanic additions to the modified materials and to show their improved resistance to acid attacks, such as HNO3 and H3PO4 solutions at 8%
Summary
Au cours de ces dernières décennies la formulation des mortiers composites a été profondément modifiée par l’introduction de multiples adjuvants [1]. Cette course à la performance s’est traduite par des formulations de mortiers composites de plus en plus complexes et riches de ces différents ajouts (ultrafines, polymères, SCMs [5], etc...). L’utilisation de résidus industriels récupérés et recyclés, tels que les ajouts cimentaires et les gisements de ressources naturelles tels que la pouzzolane et le calcaire, comme produits de remplacement partiel du ciment Portland dans le béton, permet de réduire les émissions des gaz à effet de serre CO2 et se traduit par la fabrication d’un béton ou mortier non polluant et durable sur le plan environnemental. Le but de cette étude est de présenter les résultats d’un travail de recherche portant sur la durabilité des mortiers composites à base de l’effet de la combinaison de l'ajout du polymère SPA et des SCMs telles que la pouzzolane naturelle et la fumée de silice, comme substituant au ciment et ceci pour la réalisation des mortiers de réparation conçus au développement durable. Un complément d’information sur la microstructure a été effectué par la spectrométrie IRTF
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