Effects of water-to-cement ratio, curing method and fiber on the autogenous shrinkage of early-age concrete
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This study used a temperature stress test machine (TSTM) to study the effects of the water-to-cement (w/c) ratio, curingmethod and the content of polyvinyl alcohol (PVA) fiber on the autogenous shrinkage of high-performance concrete (HPC). The experimental values were compared with theoretical values obtained from four sets of autogenous shrinkage models tocompare model accuracy. The study results indicated the followings: (1) the autogenous shrinkage value of concrete increasedwith decreases in the w/c ratio. (2) The natural and semi-adiabatic curing conditions caused the specimens to form a low- anda high-temperature rise, respectively. The higher the temperature rise, the larger the stable value of the autogenous shrinkage. (3) Among the CEB-FIP, EN-1992, RILEM and Tazawa models, the Tazawa model demonstrated the highest degree ofaccuracy. (4) PVA fiber contents of 0.75% and 0.25% had the most significant and minimal autogenous shrinkages,respectively.
Abstract
This study used a temperature stress test machine (TSTM) to study the effects of the water-to-cement (w/c) ratio, curingmethod and the content of polyvinyl alcohol (PVA) fiber on the autogenous shrinkage of high-performance concrete (HPC). The experimental values were compared with theoretical values obtained from four sets of autogenous shrinkage models tocompare model accuracy. The study results indicated the followings: (1) the autogenous shrinkage value of concrete increasedwith decreases in the w/c ratio. (2) The natural and semi-adiabatic curing conditions caused the specimens to form a low- anda high-temperature rise, respectively. The higher the temperature rise, the larger the stable value of the autogenous shrinkage. (3) Among the CEB-FIP, EN-1992, RILEM and Tazawa models, the Tazawa model demonstrated the highest degree ofaccuracy. (4) PVA fiber contents of 0.75% and 0.25% had the most significant and minimal autogenous shrinkages,respectively.
참고문헌 (32)
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