Sustainable Valorisation of Silane-Treated Waste Glass Powder in Concrete Pavement

Mazen J Al-Kheetan,Seyed Hamidreza Ghaffar,Juliana Byzyka

doi:10.3390/su13094949

Mazen J Al-Kheetan, Seyed Hamidreza Ghaffar + Show 1 more

Open Access

https://doi.org/10.3390/su13094949

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Abstract

This research presents new insights into the utilisation of waste glass powder in concrete pavements. Two different types of glass powder were used as a partial replacement for sand: 10% neat glass powder (untreated) and 10% silane-treated glass powder. The interfacial bonding properties, physical properties, and mechanical properties of concrete pavement were assessed at 7 and 28 days. Results exposed a reduction of 5% and 2% in the compressive and flexural strengths, respectively, and an increase of 15% in water absorption after the addition of neat glass powder to concrete after 7 days of curing. This is due to weak interfacial bonding between the glass powder and cementitious matrix. However, the incorporation of silane-coated glass powder led to an increase in the compressive and flexural strengths by more than 22% and 28%, respectively, and reduced the water absorption of concrete by 8%, due to the coupling functionality of silane. After 28 days of curing, the compressive strength of concrete increased by 15% and 22% after the addition of neat glass powder and silane-treated glass powder, respectively. In addition, water absorption dropped by 5% and 7% after the incorporation of neat glass powder and silane-treated glass powder.

Highlights

The sustainable construction concept emerged two decades ago to ensure green development in the construction industry and to guarantee efficient use of resources in the industry [1,2,3,4]
Glass powder was coated with Vinyl tris(2-methoxyethoxy) silane prior to incorporation into concrete
Vinyl tris(2-methoxyethoxy) silane is a vinyl-functional coupling agent with hydrophobic properties that improves the adhesion of inorganic substrates [55]

Summary

Introduction

The sustainable construction concept emerged two decades ago to ensure green development in the construction industry and to guarantee efficient use of resources in the industry [1,2,3,4]. Moving toward sustainable construction, a significant challenge in material selection and valorisation was created, where the construction sector consumes more than 60% of natural resources as building materials [2,7,8,9]. Concrete is one of the construction materials that consumes more than 20 billion tonnes of raw material every year [10]. Aside from the high consumption of raw materials in the concrete production process, the manufacturing of its main constituent, cement, accounts for more than 80% of the total CO2 emissions from concrete production [11,12,13,14]. The production of coarse and fine aggregates is responsible for the other 20% of CO2 emissions from concrete production [11,15]. Researchers started to explore other alternatives, either by replacing cement and aggregate with environmentally friendly materials, or by replacing them with recycled materials [16,17,18,19,20]

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