Benefits of using expansive and shrinkage-reducing agents in UHPC for volume stability
Benefits of using expansive and shrinkage-reducing agents in UHPC for volume stability
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DOI：
10.1680/macr.13.00317
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发表时间：
2014-01-01
影响因子：
2.7
通讯作者：
Yoon, Young-Soo
中科院分区：
文献类型：
--
作者：
Park, Jung-Jun;Yoo, Doo-Yeol;Yoon, Young-Soo
研究了膨胀剂（EA）和减缩剂（SRA）对超高性能混凝土力学性能和收缩性能的影响。沿着参考样本，该工作考虑了具有不同比例的SRA（1%和2%）、EA（5%和7.5%）以及1% SRA和7.5% EA的组合的五种不同样本。试验结果表明，抗压强度随SRA和EA的掺入而变化，抗拉强度随SRA和EA的掺入而降低。加入SRA和EA后，试样的自由收缩应变明显降低，其中加入7.5% EA的试样的自由收缩应变最小。加入SRA和EA也降低了钢的内部应变，1%SRA和7.5%EA组合的试样表现出最小的应变，即使它表现出比7.5%EA试样更大的自由收缩应变。此外，与EA的试样表现出减少钢应变后，近10天，由于拉伸蠕变效应。
This study investigated the effects of expansive agent (EA) and shrinkage-reducing agent (SRA) on the mechanical and shrinkage properties of ultra-high-performance concrete. Along with a reference specimen, the work considered five different specimens with different ratios of SRA (1% and 2%), EA (5% and 7.5%) and a combination of 1% SRA and 7.5% EA. The test results revealed that compressive strength varied with the inclusion of SRA and EA, while tensile strength decreased according to the admixing of SRA and EA. The free shrinkage strain was obviously reduced by including SRA and EA, and the specimen with 7.5% EA showed the lowest shrinkage strain. The inner steel strain was also decreased by incorporating SRA and EA, and the specimen with a combination of 1% SRA and 7.5% EA exhibited the smallest strain even though it showed a larger free shrinkage strain than the specimen with 7.5% EA. Furthermore, the specimens with EA exhibited a decrease in steel strain after nearly 10 d due to the tensile creep effect.