Abstract
This study investigated the physical-mechanical effects of cement-lime mortars containing recycled aggregate of construction and demolition waste (CDW). The natural aggregate (NA) was replaced by volume at 25%, 50%, 75% and 100% by mixed recycled aggregate (MRA) obtained from the CDW crushing. Five types of mortars were prepared with a volumetric ratio of 1:1:6 (cement, lime and aggregate) and water/binder ratio based on the fixed consistency of 260 mm. The effects of MRA on fresh and hardened mortars’ properties were analyzed. The results were analyzed using a one-way ANOVA. MRA incorporation improved most of the physical-mechanical properties of mortars tested, except for hardened bulk density, water absorption and porosity. In the long-run, mechanical strengths significantly increased in all compositions, especially those with higher percentages of MRA. The results obtained showed that the use of MRA in masonry mortars is an alternative to reduce the generation of waste and consumption of natural resources.
Highlights
RESUMEN: Evaluación de las propiedades físico-mecánicas de morteros de albañilería producidos en base de cemento y cal con áridos reciclados mixtos
Based on the homogeneous groups, no statistically significant differences were found between the bulk density of fresh reference mortar (MRA-100/0) and those produced with 75% and 100% replacement (MRA-25/75 and Mixed Recycled Aggregates (MRA)-0/100, respectively)
The use of mixed recycled aggregate (MRA) of construction and demolition waste (CDW) as a replacement for the natural aggregate (NA) for the production of masonry mortar was investigated in this work
Summary
RESUMEN: Evaluación de las propiedades físico-mecánicas de morteros de albañilería producidos en base de cemento y cal con áridos reciclados mixtos. Este estudio investigó los efectos físico-mecánicos de los morteros de cemento y cal con áridos reciclados de residuos de construcción y demolición (RCD). La incorporación de ARM mejoró la mayoría de las propiedades físico-mecánicas de los morteros, excepto la densidad aparente endurecida, la absorción de agua y la porosidad. It is estimated that the construction sector is responsible for the consumption of about 40% of all natural resources available on the planet [5] and that 1/3 of these resources are converted to cement-based products [6]. The use of recycled aggregates (RA) derived from the crushing CDW as substitutes for natural aggregates (NA) to produce new building products arises with the most efficient alternative to add value to these materials. The Brazilian standard (NBR 15116, 2004) establishes that RA should be composed of less than 90%, by mass, of Portland cement-based fragments and NA
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