Influencing Factor on Thermal Coefficient of Concrete due to Aggregate Types

골재종류가 콘크리트의 열팽창계수에 미치는 영향

  • 김진철 (도로교통기술원, 재료환경 연구그룹) ;
  • 양성철 (홍익대학교 건축공학과) ;
  • 김남호 (한국기술교육대학교 건축공학과)
  • Published : 2003.05.01

Abstract

The thermal coefficient of concrete is measured using dilatometer (AASHTO TP60) and strain gage. Testing parameters such as six different coarse aggregate types, cycles of warming and cooling, specimen shape and measurement types were investigated to evaluate the influencing factors for thermal coefficient of concrete. According to experimental results, the thermal coefficient of concrete made with crushed aggregate showed 9.2 -10.$\mu\varepsilon/^{\circ}C$, , however recycled coarse aggregate classified type II showed a little increasing in comparison with crushed aggregate. The thermal coefficient of concrete made with recycled aggregate was reduced 0.2-0.4$\mu\varepsilon/^{\circ}C$, under temperature cycles. However, specimen shapes were revealed as mainly affecting factors on the thermal coefficient of concrete. Finally the thermal coefficient value determined by the dilatometer device was shown to be similar to the value from PML 60.

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