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首页> 外文期刊>RSC Advances >Synergistic effects of silica nanoparticles/polycarboxylate superplasticizer modified graphene oxide on mechanical behavior and hydration process of cement composites
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Synergistic effects of silica nanoparticles/polycarboxylate superplasticizer modified graphene oxide on mechanical behavior and hydration process of cement composites

机译：二氧化硅纳米粒子/聚羧酸盐高效减水剂改性氧化石墨烯对水泥复合材料力学行为和水化过程的协同效应

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摘要

In this paper, the graphene oxide (GO) modified by polycarboxylate superplasticizer (PC) (PC@GO) was decorated by silica nanoparticles (SiO2 NPs) to form a hybrid structure of SiO2 NPs/PC@GO. The as-prepared SiO2 NPs/PC@GO hybrid was incorporated in cement matrix for further reinforcement. The results show that SiO2 NPs are uniformly distributed on the surface of GO nanosheets. The addition of SiO2 NPs/PC@GO hybrid (1.5% SiO2 and 0.02% GO by weight of cement) can increase the compressive strength by factors of 38.31%, 44.47% and 38.89% at 3, 7, 28 days, respectively, which are much higher than those of cement composites reinforced by a single-promoter (either PC@GO or SiO2 NPs). Moreover, our results demonstrate that SiO2 NPs/PC@GO hybrid can accelerate the cement hydration, improve the degree of pozzolanic reaction and refine the microstructure of hydration products. The excellent reinforcement is attributed to the synergistic effects of SiO2 NPs/PC@GO hybrid including better dispersion property, higher degree of pozzolanic reaction and cross-linking structure of [SiO2–GO–CSH]. This work provides a very effective way to reinforce cement composites by SiO2 NPs/PC@GO hybrid.
机译：本文利用二氧化硅纳米颗粒（SiO 2 NPs）修饰聚羧酸类高效减水剂（PC）（PC @ GO）修饰的氧化石墨烯（GO），形成杂化体。 SiO 2 NPs / PC @ GO的结构。将制备好的SiO 2 NPs / PC @ GO杂化物掺入水泥基体中进行进一步加固。结果表明，SiO 2 NPs均匀分布在GO纳米片的表面。 SiO 2 NPs / PC @ GO杂化物的添加（1.5％SiO 2 和0.02％GO重量水泥）在3、7、28天时的抗压强度分别提高38.31％，44.47％和38.89％，远高于单促进剂（PC @ GO或PC）增强的水泥复合材料的抗压强度。 SiO 2 NPs）。此外，我们的结果表明，SiO 2 NPs / PC @ GO杂化物可以促进水泥水化，提高火山灰反应的程度并细化水合产物的微观结构。 SiO 2 NPs / PC @ GO杂化物具有协同作用，具有更好的分散性，更高的火山灰反应度和[SiO]的交联结构 2 –GO–CSH]。这项工作为SiO 2 NPs / PC @ GO杂化材料增强水泥复合材料提供了一种非常有效的方法。

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