Effect of Geogrids on Interface Shear Strength Properties of Recycled Crushed Brick

Abstract

Construction and demolition (C&D) materials are defined as the materials obtained from demolition activities such as crushed concrete, crushed brick and reclaimed asphalt. The disposal of these materials in landfills is a major problem to the environment. The urgency and significance of recycling C&D materials has been raised because of scarcity of natural aggregates, difficulties in finding landfill and other environmental concerns. Hence, the present paper describes the physical and geotechnical characteristics of recycled crushed brick (CB) to reuse in different civil engineering applications. The laboratory experiments involved modified compaction test, particle size distribution, specific gravity, water absorption and Los Angeles abrasion. Furthermore, the interface shear strength properties of the CB material with geogrids and their performance as a pavement subbase material was ascertained by using a large direct shear testing (DST) apparatus. The higher tensile strength triaxial geogrid was found to attain higher interface shear strength properties than that of the lower tensile strength biaxial geogrid. The DST results however indicated that the interface shear strength properties of the geogrid-reinforced CB material were less than that of the respective material without reinforcement. The results were also found to meet the peak and residual shear strength and local road authority requirements for typical construction materials in civil engineering applications.

Damage induced by recycled Construction and Demolition Wastes on the short-term tensile behaviour of two geosynthetics

“…In addition, over the last years the environmental sustainability has been demanding a progressive increase in the waste recycling in general and in the waste valorisation in construction industry, in particular. Some studies and applications of recycled Construction and Demolition materials have been performed in recent years, mainly related to the production of aggregates for use in concrete and in base and sub-base layers of transportation infrastructures (Jiménez et al 2012;Arulrajah et al 2013a;Rahman et al 2013;Rahman et al 2015).…”