Abstract
Recycled aggregate is essential to protect Jeju Island’s natural environment, but waste concrete, including porous basalt, is a factor that lowers the quality of recycled aggregate. Therefore, an experiment was conducted to analyze the properties of concrete application of basalt-based recycled aggregate (B-RA) through quality improvement. The absorption of the B-RA ranged from 3–5%; restricting its absorption to less than 3% was challenging owing to its porosity and irregular shape. However, the increase in the solid volume percentage of the concrete when replacing 25 or 50% of fresh basalt aggregate with recycled basalt aggregate improved the mechanical performance of the concrete, especially at 25%, for which a compressive strength of 55.9 MPa and modulus of elasticity of 25.9 GPa exceeded those of concrete with fresh basalt aggregate. Moreover, increasing the replacement ratio of the fresh basalt with recycled aggregate reduced the slump and decreased the air content, consequently increasing the concrete drying shrinkage. However, the replacement of fresh basalt aggregate with recycled basalt aggregate unaltered the mechanical performance of the concrete. The results indicate that efficient use of recycled aggregates can yield superior performance to that of fresh basalt, irrespective of aggregate quality.
Highlights
In South Korea, the extensive construction of concrete buildings with rapid industrialization since the 1970s has resulted in an indiscriminate collection of raw material aggregates, continuously raising the issue of environmental destruction
This study aims to evaluate the utilization of various quality based recycled aggregate (B-RA) into concrete aggregates and examine the effect of B-RA quality depending on method of manufacturing, replacement rate, and water-cement ratio changes on concrete quality for road pavement and secondary product concrete
The cretes, the BAexhibited concrete aexhibited in slump with increasing replacement ratio of concrete decreaseaindecrease slump with increasing replacement ratio of basalt from Jeju Island (BA)
Summary
In South Korea, the extensive construction of concrete buildings with rapid industrialization since the 1970s has resulted in an indiscriminate collection of raw material aggregates, continuously raising the issue of environmental destruction. Concerns of environmental destruction are strong in Jeju Island as its natural locales have been designated as World Natural Heritage sites. Amidst this situation, the collection of essential concrete aggregates for the infrastructure and construction industry is limited, though there is an urgent need to secure aggregates for the construction of new ports and airports. Different studies have different results, it is commonly seen that the physical properties of concrete are not significantly affected under 30% of replacement of recycled aggregates [8,9]. It is reported that the quality of recycled aggregates affects that of concrete, and the mix design and materials of parent concrete have a significant effect [10]
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