The effect of temperature on strength – porosity relationship for concrete
The effect of temperature on strength – porosity relationship for concrete
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DOI：
10.1016/j.conbuildmat.2004.04.009
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发表时间：
2004-09
影响因子：
7.4
通讯作者：
F. Vodák;K. Trtík;O. Kapičková;Š. Hošková;P. Demo
中科院分区：
文献类型：
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作者：
F. Vodák;K. Trtík;O. Kapičková;Š. Hošková;P. Demo
本文对未密封的混凝土试样进行了试验，以确定在25至280 °C范围内的各种温度下的抗压强度和孔隙率。所有测量均在材料冷却后进行。同一混凝土的孔隙率使用高压水银孔隙率测定法进行测量，在硬化水泥浆的一组小钻孔碎片（平均体积为0.5立方厘米）上进行。虽然在90天龄期的混凝土表现出抗压强度S和孔隙率P之间的预期依赖性（即，S是P的减函数），28天龄的样本在这个意义上表现正好相反。因此，对于后一种情况，孔隙率似乎并不主要影响混凝土的强度。
In this paper, the unsealed concrete samples are tested to determine the compressive strengths and porosities while hot at various temperatures ranging from 25 to 280 °C. All measurements have been carried out after cooling the of the material. Porosity of the same concrete was measured using high-pressure mercury porosimetry, performed on a set of small-drilled fragments (of the average volume 0.5 cm3) of hardened cement paste. While the concrete at the age of 90 days exhibits expected dependency between compressive strength S and porosity P (i.e., S to be a decreasing function of P), specimens at the age of 28 days behave exactly conversely in this sense. Consequently, it seems to be that for the latter case the porosity does not influence dominantly the strength of concrete.