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Mechanical property and toughening mechanism of water reducing agents modified graphene nanoplatelets reinforced cement composites

机译：减水剂改性石墨烯纳米片增强水泥基复合材料的力学性能和增韧机理。

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摘要

The unique attractive properties that make graphene nanoplatelets (GNPs) effective nano-reinforcer for cement composites. Dispersion of GNPs with dispersant is a conventional method. In order to avoid the introduction of dispersant left in cement-based materials, water reducing agent was directly used to disperse GNPs. This article investigated GNPs were dispersed using different water reduced agents, the mechanical properties and toughening mechanism of modified GNPs reinforced cement composites. In this research, GNPs were dispersed well in aqueous solution using polycarboxylate superplasticizer (PS), naphthalene superplasticizer (NS) and melamine superplasticizer (MS) as dispersants with ultrasonication. Results showed that water reducers can improve the influence of GNPs on cement-based materials and a GNPs dosage of 0.06 wt% could make the GNPs/cement composites as flowable as the plain sample. The flexural strength of cement paste increased up to 16%, 13% and 20% with 0.06 wt% PS, NS and MS modified GNPs at 28d, it increased the compressive strength of the GNPs/cement composites by 8%, 5% and 11.2%. The ratio of compressive-bend strength of decline rates of PS and NS modified GNPs/cement composites were 7.4% and 8.2% at 0.06 wt% GNPs at 28d, while the ratio of compressive-bend strength of decline rates of MS modified GNPs/cement composites were 10.9% with 0.09 wt% GNPs at 28d. It found that GNPs could accelerate hydration process of cement composite, leading to more hydration products, finer CH crystals, longer mean chain length of C-S-H gel and lower porosity, and thus the propagation of cracks of the cement composites was inhibited. (C) 2019 Elsevier Ltd. All rights reserved.
机译：独特的吸引人的性能使石墨烯纳米片（GNP）成为水泥复合材料的有效纳米增强剂。用分散剂分散GNP是一种常规方法。为了避免在水泥基材料中引入分散剂，直接使用减水剂分散GNP。本文研究了使用不同的减水剂分散GNPs，改性GNPs增强水泥复合材料的力学性能和增韧机理。在这项研究中，使用聚羧酸类高效减水剂（PS），萘类高效减水剂（NS）和三聚氰胺高效减水剂（MS）作为超声分散剂，将GNPs很好地分散在水溶液中。结果表明，减水剂可以改善GNP对水泥基材料的影响，GNPs用量为0.06 wt％可使GNP /水泥复合材料像普通样品一样易流动。当PS，NS和MS改性的GNP在28d时，水泥浆的抗弯强度分别提高了16％，13％和20％，GNP /水泥复合材料的抗压强度提高了8％，5％和11.2。 ％。 PS和NS改性的GNP /水泥复合材料的抗压强度下降比率在28d时为0.06 wt％GNP时为7.4％和8.2％，而MS改性的GNP /水泥的复合材料的抗压强度下降比率为MS在28天时，复合材料的含量为10.9％，GNP为0.09 wt％。研究发现，GNPs可以促进水泥复合材料的水化过程，导致水合产物更多，CH晶体更细，C-S-H凝胶平均链长更长，孔隙率更低，从而抑制了水泥复合材料裂缝的扩展。 （C）2019 Elsevier Ltd.保留所有权利。

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