Utilization of Crumb Rubber as Aggregate in High Calcium Fly Ash Geopolymer Mortars

Abstract

This research was carried out to find out the possibility of utilizing tire crumb rubber waste as fine aggregate in fly ash-based geopolymer mortars (GPMs). The effect of replacement of river sand with crumb rubber at the levels of 0, 25, 50, 75, and 100% by volume on the geopolymer mortar properties including workability, dry density, compressive strength, flexural strength, thermal conductivity, ultrasonic pulse velocity (UPV), water absorption, and porosity were studied. The results were compared to those of the Portland cement-based mortars (PCMs). The test results demonstrated that the higher crumb rubber content resulted in the less dense matrix of mortar. However, GPMs with crumb rubber resulted in a significant improvement in flexural strength. The average ratio of flexural to compressive strengths of GPMs was 25% compared to 15% of PCMs. Also, the lower dry density and thermal conductivity of GPMs indicated better insulating properties than those of PCMs.

Metodologías empleadas para la producción de concreto permeable usando parcialmente materiales reciclados como agregados: una revisión literaria

“…Para esto se investigó los parámetros de porosidad y coeficiente de permeabilidad [5], donde la estructura de concretó permeable va a depender de las variables de la mezcla, como las dosificaciones de cemento, agua y agregados [46]. Por lo tanto, para el desarrollo de esta investigación es importante tener en cuenta el aprovechamiento de AR, así como la trituración y el tamizaje para ser utilizado como material de AR [47].…”

“…Por lo tanto, para evaluar la resistencia a la comprensión utilizaron probetas de 100 mm y 200 mm en un tiempo correlativo de 3 y 5 minutos; para la prueba a la flexión se utilizaron prismas de 200 mm, 400 mm y 70 mm, el varillado se dio de 25 veces con varilla de apisonamiento de 10 mm de diámetro, todas las muestras fueron desmoldadas a la edad de 24 horas [47]. Se probaron un total de 23 muestras, las cuales fueron cargadas a una tasa de 0.0005 mm/s, alcanzando una carga máxima en dos minutos, controlado por un compactador automático [66], donde la cantidad de cemento utilizada no solo tiende a afectar el espesor del recubrimiento, sino también a la porosidad y a las propiedades mecánicas del concreto [67].…”

Production and characterization of heat retardant fiber-reinforced geopolymer plates

“…Most of the geopolymer synthesis methods occur in this process. For example, aluminosilicate substances used in geopolymers may come from natural sources such as metakaolin (from kaolinite) or industrial wastes like fly ash and ground granulated blast furnace slag [2], [17][18][19]. These precursors are blended with an alkaline solution of silicate with the addition of a base, usually concentrated sodium or potassium hydroxide.…”

Mechanical and Fresh Properties of Multi-Binder Geopolymer Mortars Incorporating Recycled Rubber Particles

“…Rubberised geopolymer mixes (RuGM), mortars or concrete, in which the part of mineral aggregates and the cement based matrix are replaced by recycled rubber and industry by-products, respectively, combine the environmental benefits of using both waste and recycled materials in construction materials [32][33][34][35][36][37]. The lower elastic modulus of geopolymer systems compared to conventional cement-based materials can provide better compatibility with the added rubber particles.…”

“…Apart from one study [22], research on the influence of incorporating microsilica (MS) in alkali activated systems is lacking to date [32]. Additionally, studies on two-part RuGM are limited [33][34][35][36][37], and those on one-part RuGM are non-existent [38]. This study aims at developing one-part FA/GGBS/MS CGM and RuGM systems that are safe and effective for on-site use, as well as have appropriate durability, enhanced mechanical and environmental performance for structural applications.…”