Macro- and Microstructural Investigations on Strength and Durability of Pumice Concrete at High Temperature
Macro- and Microstructural Investigations on Strength and Durability of Pumice Concrete at High Temperature
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DOI：
10.1061/(asce)0899-1561(2006)18:4(527
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发表时间：
2006-08
影响因子：
3.2
通讯作者：
K. Hossain
中科院分区：
文献类型：
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作者：
K. Hossain
本文描述了掺入0-40%细磨浮石作为水泥替代品（按质量计）的混凝土在高达800°C高温下的强度和耐久性性能。通过非应力残余抗压强度评估其强度特性，通过裂纹模式观察、快速氯化物渗透试验（RCPT）、压汞孔隙度测定法、显微硬度测试和差示扫描量热法研究其耐久性。RCPT结果表明，混凝土耐久性劣化开始于低于抗压强度劣化开始的温度。这种耐久性的损失可以解释为硬化水泥浆体（hcp）和骨料之间的界面过渡区减弱，以及hcp孔隙结构同时变粗。当含有浮石时，观察到耐火性能的改善，其特征是更高的残余抗压强度和改善的耐久性。浮石混凝土……
The strength and durability performance of concretes incorporating 0–40% of finely ground pumice as cement replacement (by mass) subjected to high temperatures up to 800°C is described. The strength properties were assessed by unstressed residual compressive strength, while durability was investigated by crack pattern observations, the rapid chloride permeability test (RCPT), mercury intrusion porosimetry, microhardness testing, and differential scanning calorimetry. The results of RCPT revealed that concrete durability deterioration commences at temperatures that are lower than those at which compressive strength deterioration commences. Such a loss of durability can be explained by a weakened interfacial transition zone between the hardened cement paste (hcp) and aggregate and by the concurrent coarsening of the hcp pore structure. When pumice is included, an improvement of fire resistance was observed, as characterized by the higher residual compressive strength and improved durability. Pumice concrete...