Abstract
Recycled aggregates have been widely studied and used in concrete products nowadays. There are still many waste materials that can be used as recycled aggregates other than crushed concrete particles. This paper aims to study the property variations of sustainable concrete paving block incorporating different contents of construction wastes. Five different types of waste materials were used in this project, including: recycled concrete coarse aggregate (RCCA), recycled concrete fine aggregate (RCFA), crushed glass (CG), crumb rubber (CB), and ground granulated blast furnace slag (GGBS). According to the test results of the properties of blocks mixed with different levels of wastes materials, it is concluded that adding both RCCA and RCFA in the block can decrease its strength and increase the water absorption. The suggested replacement levels for RCCA and RCFA are 60% and 20%, respectively. Mixing crushed glass in the concrete paving blocks as a type of coarse aggregates can improve the blocks’ strength and decrease the blocks’ water absorption. Addition of crumb rubber causes a significant deterioration of blocks’ properties except for its slip resistance.
Highlights
In China, the construction industry has developed rapidly since late 1990s [1]
By observing the section of crushed blocks mixed with different recycled coarse aggregates, recycled concrete coarse aggregate (RCCA) and crushed glass (CG), it can be noticed that the coarse aggregate particles maintained their shapes after blocks crushing, which proves that the failure was due to the failure of mortar
According to the experiment results in the properties of concrete paving blocks mixed with different types of recycled wastes, the following conclusions can be drawn:
Summary
In China, the construction industry has developed rapidly since late 1990s [1]. High-rise buildings are established, and the old buildings are demolished at the same time. Due to the irreplaceability of concrete in the construction industry, large quantities of concrete were used in the past two decades, and this situation leads to the generation of large volumes of construction waste [2]. Using recycled demolished concrete as the aggregate in the new construction products can reduce the utilization of the limited nature resource and reduce the environmental burden at the same time. Relevant studies about using construction wastes in concrete products were investigated by many researchers. Concrete containing waste material is generally regarded as a type of “sustainable concrete”. In this case, studying on the maximum possible amount of recycled materials in concrete, and extending the types of waste materials that can be used in concrete are important in the sustainable concrete research area
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