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Title |
Evaluation on Strain Properties of 60 MPa Class High Strength Concrete according to the Coarse Aggregate Type and Elevated Temperature Condition
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DOI |
https://doi.org/10.4334/JKCI.2014.26.3.247 |
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Keywords |
인공경량골재 ; 골재밀도 ; ISO-834 표준가열곡선 ; 열팽창변형 ; 고온크리프 artificial lightweight aggregate ; aggregate density ; ISO-834 standard fire curve ; thermal strain ; steady state creep |
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Abstract |
Strain properties of concrete member which acts as an important factor in the stability of the concrete structure in the event of fire, significantly affected the characteristics of the coarse aggregate, which accounts for most of the volume. For this reason, there are many studies on concrete using artificial lightweight aggregate which has smaller thermal expansion deformation than granite coarse aggregate. But the research is mostly limited on concrete using clay-based lightweight aggregate. Therefore, in this study, the high temperature compressive strength and elastic modulus, thermal strain and total strain, high temperature creep strain of concrete was evaluated. As a result, remaining rate of high-temperature strength of concrete using lightweight aggregate is higher than concrete with general aggregate and it is determined to be advantageous in terms of structural safety and ensuring high-temperature strength from the result of the total strain by loading and strain of thermal expansion. In addition, in the case of high-temperature creep, concrete shrinkage is increased by rising loading and temperature regardless of the type of aggregate, and concrete using lightweight aggregate shows bigger shrinkage than concrete with a granite-based aggregate. From this result, it is determined to require additional consideration on a high temperature creep strain in case of maintaining high temperature like as duration of a fire although concrete using light weight aggregate is an advantage in reducing the thermal expansion strain of the fire.
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