Browsing by Keyword "Masonry mortar"
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Item Design and performance of masonry mortars made with recycled concrete aggregates(2009) Vegas, I.; Azkarate, I.; Juarrero, A.; Frías, M.; GENERALThe present paper discusses the technical feasibility of using the fine fraction of recycled aggregate from concrete rubble to manufacture cement mortar and possible conditions. An initial study of the chemical and physical-mechanical characteristics of fines recycled from selected concrete showed that their high absorptivity and high sulfate content compared to natural limestone sands were the limiting factors to their in masonry mortars. As in the case of structural concrete, a blend of recycled and natural aggregate would appear to be suitable for masonry mortars. A study of the mix proportions and characteristics of mortars made with recycled concrete aggregate showed that up to 25% recycled aggregate can be used in cement-based masonry mortars with no significant decline in performance and no new admixtures or higher cement content requires.Item Effect of high-alumina ladle furnace slag as cement substitution in masonry mortars(2016-10-01) Herrero, Tamara; Vegas, Iñigo J.; Santamaría, Amaia; San-José, José T.; Skaf, Marta; GENERALLadle furnace (white or basic) slag is a significant by-product of the steelmaking industry; nowadays the manufacturing process yields two types of basic slag that are either low or high in alumina. The present research focuses mainly on the composition of the high-alumina slag and the reactivity of its compounds such as calcium aluminates, free calcium oxide, and free magnesium oxide, when aged at room temperature and at water steam temperature (accelerated aging). Additionally, a characterization was performed of pastes and masonry mortars that incorporate high alumina ladle furnace slag as a supplementary cementing material in partial substitution of Portland cement in amounts of 10% and 20% by weight. Different properties are studied such as porosity distribution, volumetric stability, mechanical strength and durability, mainly referring to wetting-drying aging cycles. The study concludes that high-alumina ladle furnace slag can induce slight hydraulic reactivity and its partial addition has no negative effect on the fundamental properties of cement masonry mortars.