Thermal expansion of self-consolidating normal and lightweight aggregate concrete at elevated temperature
Thermal expansion of self-consolidating normal and lightweight aggregate concrete at elevated temperature
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DOI：
10.1016/j.conbuildmat.2009.04.004
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发表时间：
2009-09
影响因子：
7.4
通讯作者：
T. Uygunoğlu;I. Topcu
中科院分区：
文献类型：
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作者：
T. Uygunoğlu;I. Topcu
在这项研究中，骨料类型的影响，在高温下的自固结混凝土与正常（SCC）和轻骨料（SCLC）生产的热膨胀系数进行了研究。在实验中，两种骨料类型，破碎的石灰石和浮石，被使用。水/粉比和高效减水剂剂量水平的不同组合制备的SCC和SCLC混合物。在实验中，总粉末含量（水泥和矿物添加剂）是恒定的。采用热膨胀仪对老化28天的SCC和SCLC进行热膨胀试验，以准确表征其热膨胀系数。SCC和SCLC的热膨胀系数是通过测量在一定温度范围内的混凝土试样的长度的线性变化来定义的。试验温度在20 °C至1000°C之间变化，加热速率为5°C/min。结果表明，一般情况下，SCC具有比正常重量混凝土更高的CTE，并且由于其多孔结构，轻骨料降低了SCC的CTE。骨料类型对自密实混凝土的热膨胀有显著影响。
In this study, the effects of aggregate type on the coefficient of thermal expansion of self-consolidating concrete produced with normal (SCC) and lightweight aggregate (SCLC) at elevated temperature were investigated. In experiments, two aggregate types, crushed limestone and pumice, were used. Different combinations of water/powder ratio and superplasticizer dosage levels were prepared for the SCC and SCLC mixtures. The total powder content (cement and mineral additives) was constant in the experiments. Thermal test was performed to accurately characterize the coefficient of thermal expansion (CTE) of SCC and SCLC aged 28days using the dilatometer. The CTEs of SCC and SCLC were defined by measuring the linear change in length of concrete specimens subjected to a range of temperatures. Test temperatures were varied from 20 to 1000°C at a heating rate of 5°C/min. The results, in general, showed that SCC has higher CTE than normal weight concrete and that lightweight aggregate reduced the CTE of SCC due to their porous structure. The aggregate type has significant influence on the thermal expansion of SCC.