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Title |
An Experimental Study on Pumpability Characteristics of High Strength Concrete Mixed Polymix
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DOI |
https://doi.org/10.4334/JKCI.2012.24.5.509 |
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Keywords |
폴리믹스 ; 섬유혼입 콘크리트 ; 탄성계수 ; 파이프압력 ; 마찰계수 polymix ; fiber mixed concrete ; elastic modulus ; pipe pressure ; coefficient of friction |
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Abstract |
The aims of this research is to develop a fire resistant admixture to enhance high-pressured pumping of highstrength concrete (HSC) with a compressive strength of 60~80 MPa. Generally, the efficiency of HSC high-pressured pumping is dramatically reduced due to entanglement of short fibers added to prevent fire spalling. Therefore, the fire resistant admixture that can facilitate pumping of fire resistant HSC is urgently needed presently. The fire resistant HSC mix is comprised of Polypropylene fiber, Nylon fiber and Polymer powder. The test results showed that the slump-flow was improved by approximately 70% of the HSC without fire resistant admixture. However, the air void content was increased slightly due to the addition. The standard design compressive strength at 28-days was satisfied, while its flexural strength was similar to the concrete without the admixture. Since the flexural strength was 12~15% of its compressive strength, the general trend of flexural to compressive strength ratio in normal concrete was maintained. Even though its elastic modulus was decreased by adding the admixture, the study results showed that the concrete can be used for construction since all of the test results exceeded the code requirements.
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