Abstract
The use of recycled aggregate in new concrete has often been limited due to concerns over their quality and structural performance. This research aims to investigate the physical properties of recycled roof tile aggregate and its suitability for concrete production. Physical properties of recycled roof tile aggregate are compared to normal crushed stone aggregate. Effects of recycled roof tile aggregates on strength and durability of recycled roof tile concrete was compared with normal aggregate concrete using mechanical properties and durability tests. The experimental results showed that high water absorption and low strength of aggregate have a great effect on the workability and strength of the concrete containing recycled roof tile aggregate. Aggregate density, water absorption, crushing value and abrasion value of the recycled roof tile aggregate were found to be lower than crushed stone aggregate and concrete containing recycled roof tile aggregate had low strength and slow strength development. Similar durability performance of recycled roof tile aggregate concrete and normal aggregate concrete was observed except when exposed to freezing and thawing.
Highlights
The use of concrete in different civil engineering applications has placed a high demand on constituent materials
This paper provides additional knowledge of material properties of recycled roof tile aggregate, strength and durability performance of concrete containing recycled roof tile as coarse aggregate
Experimental results showed that concrete containing coarse recycled roof tile aggregate (RTG+S) had low strength as compared to concrete with fine recycled roof tile aggregate experimental results showed that concrete containing coarse recycled roof tile aggregate (RTG+S) had low strength as compared to concrete with fine recycled roof tile aggregate (G+RTS). These results indicate that coarse recycled roof tile aggregate had a larger influence on strength of concrete when
Summary
The use of concrete in different civil engineering applications has placed a high demand on constituent materials. One of the objectives of the new waste reuse and recycling policies in the construction and industrial sectors is to use recycled aggregates as a substitute for conventional natural aggregates, with the aim of reducing both use of natural resources and environmental impact caused by dumping [3]. These waste materials can solve problems like lack of aggregates in construction sites and environmental problems [4]. Suitability of recycled waste materials, like roof tile in concrete production, would go a long way in addressing the high dependency on natural mineral aggregate, aggregate depletion issue, and environmental problem
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