Abstract
There has been an increasing amount of waste concrete generated in recent years, which has made recycling more important. Waste concrete is generally recycled as recycled aggregates, and many studies have been conducted to seek ways to improve their quality. Such quality improvement processes has led to the generation of byproducts such as waste concrete powder, which needs to be recycled efficiently based on further research. Accordingly, this study was conducted with the aim to use waste concrete powder (WCP) to substitute silica powder in the manufacturing of the extrusion concrete panels in cases where high SiO2 content is not a requirement. The results of this study showed a negative correlation between flexural strength and silica powder-WCP substitution ratio. For example, 50% substitution resulted in a product that satisfied the required flexural strength over 14 MPa as stipulated by the Korean Industrials Standards, and it gave rise to properties such as specific gravity, absorption ratio, length change, thermal conductivity, and fire-resistance that were similar to those of plain specimens. Based on these results, it was deemed that it would be possible to use WCP as an alternative material in place of siliceous fillers in cases where high-purity is not required.
Highlights
Concrete is a material that is used widely across human society, as it is a major component of various social infrastructures such as buildings, roads, and bridges
The characteristics of extraction concrete panel specimens specified by the Korean Industrial Standards (KS), such as flexural strength, specific gravity, absorption rate, rate of change in length, and thermal conductivity according to absorption, and fire-resistance were reviewed
The flexural strength decreased with an increased than 14 MPa, which is the prescribed level for extrusion concrete panels in KS F 4735
Summary
Concrete is a material that is used widely across human society, as it is a major component of various social infrastructures such as buildings, roads, and bridges. Concrete is mostly comprised of aggregates in terms of volume, and various environmental issues arise from collecting aggregates from rivers and land. For this reason, annual aggregate supply plans are established at the state level in Korea as a means to limit the acquisition of natural aggregates, and it is recommended that industrial byproducts such as waste concrete and steel slags be used to obtain aggregate instead [1]. Recycled aggregates obtained by crus hing and grinding waste concrete have higher absorption rates and a lower strength in comparison to natural aggregates. The wet processes involve the elution of calcium hydroxide, comprising of cement paste, for the purpose of weakening its strength and increasing
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