화산암재 경량골재의 구조용 경량콘크리트로서의 활용방안에 대한 기초적 자료를 제공할 목적으로 4종류의 피복 화산암재를 제조하여 각 시료의 비중, 흡수율, 단위용적중량, 공극율과 실적율등을 측정하고 각 시료를 사용하여 경량콘크리트를 제조하여 각 조건에 따라 압축강도, 단위용적중량, 슬럼프 등을 측정하였다. 실험결과를 요약하면 다음과 같다. (1) 피복 화산암재의 흡수율은 1.7~10.1%, 단위용적중량은 0.91~0.97t/㎥으로 나타났으며, 이 시료로 제조된 경량콘크리트의 압축강도는 162~215kg/$ extrm{cm}^2$으로 나타났다. (2)물시멘트비와 단위시멘트량을 증가시켰을 때 사용한 피복시료의 흡수율이 클수록 압축강도 감소율이 크게 나타나다. (3) 본 실험결과 피복 화산암재 제조시의 부착불량 현상만 해소된다면 표면피복제와 시멘트 페이스트를 함께 사용한 피복시료를 이용하여 낮은 흡수율과 높은 압축강도의 경량골재콘크리트를 제조 할 수 있음을 알 수 있다.
This experimental study is aimed to investigate the coating method of scoria lightweight aggregate for reo duction of water absorption and the physical dynamic characteristics of coated-scoria jightweight aggregate con¬crete. The coating methods are as follows: I) Non-coating method. II) Coating method of only cement paste. rn) Coating mehtod of surface-coating agent after coating by cement paste. IV) Coating method of only surfaee-coating agent. V) Coating method of cement pasted after coating by surface-coating agent. The summerized conclusion are as fallows ; 1) Specific gravity and the rate of water absorption were lowest when aggregate was covered by only surface-coating agent, especially, rate of absorption was about 10% of non-coating aggregate. 2) Coated-aggregate were about 0.87~0.97t/m3 and lightweight concrete made of coated-aggre¬gates were 1.80~ 1.94 t/m3 in unit weight. 3) Compressive strength of the lightweight concrete made of cement pasted-coating aggregate was about 200~215kg/crrl. 4) The higher the rate of water absorption of coarse aggregate, the higher the rate of deterioration of compressive strength.
