Recently, ready-mixed concrete companies are using disqualified aggregates which lack in both grade and grain shape due to the shortage of natural aggregate. However, still there aren t any clear and accurate blending method and quality standard existing. In this paper, we surveyed ready-mix concrete companies about the quality level and blending of aggregates in order to standardize the blended aggregates on concrete. Survey results indicated that blending of aggregates is common for the aim of quality improvement, and usually grade and grain shape were the main cause of the blending. To sum up the ready-mixed concrete companies view point, once the blended aggregate s quality standard is set, the supply shortage and quality problem of aggregates can be solved.
1. 서론
2. 조사계획 및 방법
3. 설문결과 및 고찰
4. 결론