Investigating the effects of using different types of SiO2 nanoparticles on the mechanical properties of binary blended concrete
Investigating the effects of using different types of SiO2 nanoparticles on the mechanical properties of binary blended concrete
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DOI：
10.1016/j.compositesb.2013.04.035
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发表时间：
2013-11
影响因子：
13.1
通讯作者：
Alireza Najigivi;A. Khaloo;A. I. Zad;S. Rashid
中科院分区：
文献类型：
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作者：
Alireza Najigivi;A. Khaloo;A. I. Zad;S. Rashid
本研究的目的是评估两种不同类型的SiO2纳米粒子（N和M系列）与不同比例的工作性和抗压强度的开发二元混合混凝土固化水和石灰溶液作为两种不同的固化介质的影响。使用从供应商获得的平均尺寸为15 nm的N和M系列SiO2纳米颗粒。新的和硬化的混凝土掺入0.5%，1.0%，1.5%和2.0%的N和2%的M系列纳米粒子与恒定的水与粘合剂的比例和骨料含量进行了测试。新鲜的混合物进行了测试的可加工性和硬化混凝土进行了测试，在7，28和90天的固化的抗压强度。新拌混凝土试验结果表明，两种SiO2纳米粒子的存在均降低了二元共混物的工作性。硬化混凝土试验结果表明，N系列SiO2纳米颗粒用于生产具有显著提高的强度的混凝土的最佳水泥替代量设定为1.0 wt.%在水中固化后。然而，二元混合混凝土的极限强度在2.0wt.%时获得在石灰溶液中养护后，用两个系列替代水泥。结果表明，SiO2纳米粒子通过在处理过程中形成额外的水化硅酸钙凝胶对混凝土的力学性能起着重要作用，对提高二元共混物的抗压强度起着重要作用。目前的研究揭示了纳米技术在混凝土纳米工程的影响。
The aim of this study was to assess the effects of two different types of SiO2nanoparticles (N and M series) with different ratios on the workability and compressive strength of developed binary blended concretes cured in water and lime solution as two different curing media. N and M series SiO2nanoparticles with an average size of 15 nm were used as obtained from the suppliers. Fresh and hardened concretes incorporating 0.5%, 1.0%, 1.5% and 2.0% of N and 2% of M series nanoparticles with constant water to binder ratio and aggregate content were made and tested. Fresh mixtures were tested for workability and hardened concretes were tested for compressive strength at 7, 28 and 90 days of curing. Fresh concrete test results showed that the workability of binary blends was reduced in the presence of both types of SiO2nanoparticles. Hardened concrete test results revealed that the optimal replacement level of cement by N series of SiO2nanoparticles for producing concrete with considerably improved strength was set at 1.0 wt.% after curing in water. However, the ultimate strengths of binary blended concretes were gained at 2.0 wt.% replacement of cement by both series after curing in lime solution. It is concluded that SiO2nanoparticles play significant roles in mechanical properties of concrete by formation of additional calcium silicate hydrate gel during treatment, which played an important role in raising highly the compressive strength of binary blends. The current study sheds light on the implications of nanotechnology in nano-engineering of concrete.