Improvement compressive strength of concrete in different curing media by Al2O3 nanoparticles
Improvement compressive strength of concrete in different curing media by Al2O3 nanoparticles
复制标题
DOI：
10.1016/j.msea.2010.09.098
复制
发表时间：
2011-01-25
期刊：
影响因子：
6.4
通讯作者：
Riahi, Shadi
中科院分区：
文献类型：
--
作者：
Nazari, Ali;Riahi, Shadi
研究了养护介质对掺纳米Al2O3混凝土微观结构、物理力学性能和热学性能的影响。波特兰水泥部分取代Al2O3纳米粒子的平均粒径为15 nm和试样固化在水和饱和石灰水为特定的年龄。结果表明，Al2O3纳米粒子最高达2.0%生产的混凝土具有改善的抗压强度和凝结时间时，标本在饱和石灰水养护。水中固化试样的最佳置换量为1.0wt%。虽然石灰水降低了混凝土的强度，没有纳米粒子，当它与在水中固化的标本相比，固化的标本轴承纳米粒子在饱和石灰水的结果，在更强的凝胶形成周围的氧化铝纳米粒子引起更快的凝固时间，连同高强度。导热量热测试中峰的出现加快，热重分析中失重增加，X射线衍射分析中与水合产物相关的峰出现更快，表明纳米Al2O3颗粒能够改善试样的力学性能和物理性能。(C)2010 Elsevier B.V.保留所有权利。
In the present work, the effect of curing medium on microstructure together with physical, mechanical and thermal properties of concrete containing Al2O3 nanoparticles has been investigated. Portland cement was partially replaced by Al2O3 nanoparticles with the average particle size of 15 nm and the specimens were cured in water and saturated limewater for specific ages. The results indicate that Al2O3 nanoparticles up to maximum of 2.0% produces concrete with improved compressive strength and setting time when the specimens cured in saturated limewater. The optimum level of replacement for cured specimens in water is 1.0 wt%. Although the limewater reduces the strength of concrete without nanoparticles when it is compared with the specimens cured in water, curing the specimens bearing nanoparticles in saturated limewater results in more strengthening gel formation around Al2O3 nanoparticles causes more rapid setting time together with high strength. Accelerated peak appearance in conduction calorimetry tests, more weight loss in thermogravimetric analysis and more rapid appearance of peaks related to hydrated products in X-ray diffraction results, all indicate that Al2O3 nanoparticles could improve mechanical and physical properties of the specimens. (C) 2010 Elsevier B.V. All rights reserved.