Hybrid effect of carbon nanotube and nano-clay on physico-mechanical properties of cement mortar
Hybrid effect of carbon nanotube and nano-clay on physico-mechanical properties of cement mortar
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DOI：
10.1016/j.conbuildmat.2010.06.046
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发表时间：
2011-01-01
影响因子：
7.4
通讯作者：
Aqel, M.
中科院分区：
文献类型：
--
作者：
Morsy, M. S.;Alsayed, S. H.;Aqel, M.
在这项工作中，几种纳米材料已被用于胶凝基质：多壁碳纳米管（MWCNTs）和纳米粘土。研究了这些纳米材料与普通硅酸盐水泥（OPC）的物理力学性能。本研究使用的纳米粘土为纳米高岭土。将纳米高岭土在750℃下热活化2 h制备偏高岭土，并用有机氯化铵辅助粘土片状物的剥离。本研究中使用的混合水泥由普通硅酸盐水泥、碳纳米管和剥落的纳米偏高岭土组成。用纳米偏高岭土（NMK）代替6 wt.%的OPC，用0.005、0.02、0.05和0.1 wt.%的水泥加入碳纳米管。本试验采用的水泥砂比为1:2 wt.%。采用水泥的水胶比为0.5 wt.%配制水泥砂浆。新鲜砂浆膏体先在100%相对湿度下养护24 h，然后在水中养护28 d。研究了混合水泥的抗压强度、相组成和微观结构。结果表明，用6 wt.% NMK替代OPC可使混合砂浆的抗压强度比对照提高18%，6 wt.% NMK和0.02 wt.% CNTs的组合可使混合砂浆的抗压强度比对照提高29%。(C) 2010 Elsevier Ltd.版权所有。
In this work, several nanomaterials have been used in cementitious matrices: multi wall carbon nanotubes (MWCNTs) and nano-clays. The physico-mechanical behavior of these nanomaterials and ordinary Portland cement (OPC) was studied. The nano-clay used in this investigation was nano-kaolin. The metakaolin was prepared by thermal activation of nano-kaolin clay at 750 degrees C for 2 h. The organic ammonium chloride was used to aid in the exfoliation of the clay platelets. The blended cement used in this investigation consists of ordinary Portland cement, carbon nanotubes and exfoliated nano metakaolin. The OPC was substituted by 6 wt.% of cement by nano metakaolin (NMK) and the carbon nanotube was added by ratios of 0.005, 0.02, 0.05 and 0.1 wt.% of cement. The blended cement: sand ratio used in this investigation was 1:2 wt.%. The blended cement mortar was prepared using water/binder ratio of 0.5 wt.% of cement. The fresh mortar pastes were first cured at 100% relative humidity for 24 h and then cured in water for 28 days. Compressive strength, phase composition and microstructure of blended cement were investigated. The results showed that, the replacement of OPC by 6 wt.% NMK increases the compressive strength of blended mortar by 18% compared to control mix and the combination of 6 wt.% NMK and 0.02 wt.% CNTs increased the compressive strength by 29% than control. (C) 2010 Elsevier Ltd. All rights reserved.