제강슬래그 골재의 TTP 적용성검토를 위한 연구

Abstract

In order to evaluate the applicability of slag aggregates for tetrapod concrete, the properties of concrete as structural material were investigated. The biochemical research of marine concrete using slag aggregates was also carried out. The tested concrete properties are slump, air content, compressive strength, splitting tensile strength, elastic modulus, carbonation, hydration heat, freezing and thawing, sulfate attack, drying shrinkage, etc. The biochemical experiments are to research the propagation and reproduction of seaweeds and survival of bottom dwelling species. According to the experimental results, the slag aggregate content did not have a significant effect on compressive strength, splitting tensile strength and elastic modulus. Though the increase of slag aggregate content decreased slightly slump and air content, the loss of slum and air content was controled increasing the dosage quantity of superplasticizer. The durability of concrete, such as freezing and thawing, carbonation and sulfate attack, was not influenced by the slag aggregate content. The slag aggregate content did not have a influence on the heat of hydration, but the heat of hydration of slag cement concrete is smaller than that of ordinary portland cement concrete. From the biochemical research, slag aggregate can be evaluated as the material that is ideally suited for promoting propagation and reproduction of seaweeds and survival of bottom dwelling species. It was also shown that iron-containing slag could contribute to the restoration of coastal ecosystem through propagation of seaweeds by providing trace elements required for their growth.