This paper presents an investigation into the fresh and hardened properties of concrete enhanced with graphene nanoplatelets (GNPs). GNP dispersions were prepared using wet dispersion techniques and the influence of various factors on dispersion quality, such as mixing/dispersion methods, sonication time/intensity and GNP concentrations were evaluated. Sedimentation photos and zeta potential analysis were used to assesses the stability of GNP dispersions and determine optimal dispersion conditions for incorporation of GNPs into the concrete specimens. Further, advanced X-ray diffraction (XRD) techniques were used to determine the crystallographic structure of GNPs and a scanning electron microscope (SEM) revealed information about the external morphology (texture), composition and the orientation of the nano materials. Various GNP concentrations were explored including: 0.0, 0.05, 0.1, 0.15, 0.20, 0.25, 0.3 and 0.35 wt % and their effects on workability, apparent density, compressive strength and flexural strength were evaluated. The results suggested that the optimal concentration of GNP was 0.25 wt% which increased compressive and flexural strength of concrete by up to 20.7% and 8.8%, respectively. However, the addition of 0.25 wt% GNPs decreased workability by more than 50% compared to control specimens. Further, apparent density of concrete specimens was not affected by adding GNPs.

本文介绍了对用石墨烯纳米片 (GNP) 增强的混凝土的新鲜和硬化性能的调查。GNP 分散体采用湿法分散技术制备，并评估了各种因素对分散质量的影响，例如混合/分散方法、超声处理时间/强度和 GNP 浓度。沉降照片和 zeta 电位分析用于评估 GNP 分散体的稳定性，并确定将 GNP 掺入混凝土样本的最佳分散条件。此外，先进的 X 射线衍射 (XRD) 技术用于确定 GNP 的晶体结构，扫描电子显微镜 (SEM) 揭示了有关纳米材料的外部形态（纹理）、成分和方向的信息。探索了各种 GNP 浓度，包括：0.0、0.05、0.1、0.15、0.20、0.25、0.3 和 0.35 wt%，并评估了它们对可加工性、表观密度、压缩强度和弯曲强度的影响。结果表明，GNP 的最佳浓度为 0.25 wt%，可使混凝土的抗压强度和抗弯强度分别提高 20.7% 和 8.8%。然而，与对照样品相比，添加 0.25 wt% GNP 可使可加工性降低 50% 以上。此外，混凝土试样的表观密度不受添加 GNP 的影响。25 wt%，使混凝土的抗压强度和抗弯强度分别提高了 20.7% 和 8.8%。然而，与对照样品相比，添加 0.25 wt% GNP 可使可加工性降低 50% 以上。此外，混凝土试样的表观密度不受添加 GNP 的影响。25 wt%，使混凝土的抗压强度和抗弯强度分别提高了 20.7% 和 8.8%。然而，与对照样品相比，添加 0.25 wt% GNP 可使可加工性降低 50% 以上。此外，混凝土试样的表观密度不受添加 GNP 的影响。