A Fundamental Study on the Potential of Alkali-Aggregate Reaction according to KS F 2545 and ASTM C 1260 Test Methods

Abstract

Chemical experiment KS F 2545 and Physical experiment ASTM C 1260 has been accomplished to estimate the potential of alkali aggregate. Used for testing aggregate samples are forest aggregate and recycled aggregate which collected in Gangwon province Samcheok and Pyeongchang, Jeollabuk province Gimje and Kochang, and Gyeongsangnam province Goryeong. As the results of chemical experiment confirmed that if silicate rock and carbonate rock are mixed, reduction in alkalinity is increase. So it has been identified that case makes a disturb at the result of alkali aggregate reaction. In 9 out of the 62 aggregate samples check dissolved silica exceeding 100 mmol/ℓ. and mortar bar length increase rate confirmed that 5 of 9 chemical method aggregates were 0.1~0.2% and 2 aggregates were 0.2%. As a result of the alkaline aggregate reaction test using the chemical method and the mortar bar method, the aggregates showing alkali aggregate reaction are sandstone and tuff aggregates. Therefore, Alkali aggregate reaction tests are required to use clastic sedimentary rocks and volcanic pyroclastic rocks aggregates.

A Fundamental Study on the Load Resistance Characteristics of Revetment Concrete Block with Recycled Concrete Aggregate and GFRP Rebar

“…1과 같이 건설폐기물의 발생량은 점차 증가되고 있는 실정이며, 향 후 폐콘크리트 및 순환골재의 발생량도 증가될 것으로 예 상되고 있다 3,4) . 순환골재는 표면의 부착모르타르에 의해 일반골재에 비해 밀도가 낮고 흡수율이 높으며 5) , 순환골 재를 사용한 콘크리트는 일반콘크리트에 비해 강도 및 내 구성이 낮은 것으로 평가되고 있다 6,7) . 그러나 적절한 혼 화재의 적용, 양생 및 품질관리의 개선을 통해 일반콘크 리트와 유사한 성능을 유도할 수 있으므로 순환골재는 천 연골재를 대체할 수 있는 가능성이 가장 높은 골재로 분석 되고 있다 8) .…”