Reuse of ground waste glass as aggregate for mortars

• Published in: Waste management (Elmsford) Vol. 25; no. 2; pp. 197 - 201
• Main Authors: Corinaldesi, V., Gnappi, G., Moriconi, G., Montenero, A.
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Oxford Elsevier Ltd 2005; New York, NY Elsevier Science
• Subjects: Applied sciences; Conservation of Natural Resources; Construction Materials; Exact sciences and technology; Glass; Materials Testing; Other wastes and particular components of wastes; Particle Size; Pollution; Refuse Disposal - methods; Stress, Mechanical; Wastes; Chemical reactivity; Glass waste
• ISSN: 0956-053X; 1879-2456
• DOI: 10.1016/j.wasman.2004.12.009

This work was aimed at studying the possibility of reusing waste glass from crushed containers and building demolition as aggregate for preparing mortars and concrete. At present, this kind of reuse is still not common due to the risk of alkali–silica reaction between the alkalis of cement and silica of the waste glass. This expansive reaction can cause great problems of cracking and, consequently, it can be extremely deleterious for the durability of mortar and concrete. However, data reported in the literature show that if the waste glass is finely ground, under 75 μm, this effect does not occur and mortar durability is guaranteed. Therefore, in this work the possible reactivity of waste glass with the cement paste in mortars was verified, by varying the particle size of the finely ground waste glass. No reaction has been detected with particle size up to 100 μm thus indicating the feasibility of the waste glass reuse as fine aggregate in mortars and concrete. In addition, waste glass seems to positively contribute to the mortar micro-structural properties resulting in an evident improvement of its mechanical performance.