The effects of graphene oxide (GO) on the microstructure and resistance to chloride ion (Cl₋) penetration of matrix containing 0-0.05% GO were investigated through isothermal calorimetry, thermogravimetric analysis, X-ray diffraction, mercury intrusion porosimetry and the rapid chloride penetration test method. A proper dosage of GO promoted the hydration process of cement, increased the calcium hydroxide (Ca(OH)₂) content, refined the size of calcium hydroxide, promoted the formation of high-density calcium silicate hydrate and improved the pore size distribution of cement matrix. Compared to the group without GO, the porosity of concrete containing 0.03% GO decreased by 8.56%, the largest pore diameter decreased by 29.05% and pores larger than 50 nm were reduced by 36.93%. In addition, the incorporation of GO improved the resistance to chloride ion penetration of concrete. The charge passed through the concrete first decreased and then increased with the increasing GO dosage. When the dosage of GO was 0.03%, the charge passed through the concrete was 27.71% lower than that of the control group. There was a significant correlation between the permeability of chloride ions and pore structure, especially the proportion of pores larger than 50 nm of concrete.

中文翻译：

---

氧化石墨烯对混凝土抗氯离子渗透的影响

采用等温量热法、热重分析法、X射线衍射法、压汞法和快速氯化法研究了氧化石墨烯（GO）对含0-0.05% GO基体微观结构和抗氯离子（Cl _- ）渗透的影响。渗透测试方法。适量的GO促进了水泥的水化过程，增加了氢氧化钙（Ca(OH) ₂)含量，细化氢氧化钙粒径，促进高密度水合硅酸钙的形成，改善水泥基体的孔径分布。与不含GO的组相比，含0.03% GO的混凝土孔隙率降低了8.56%，最大孔径降低了29.05%，大于50 nm的气孔降低了36.93%。此外，GO的加入提高了混凝土对氯离子渗透的抵抗力。随着 GO 用量的增加，通过混凝土的电荷先减少后增加。当GO用量为0.03%时，通过混凝土的电荷比对照组低27.71%。氯离子的渗透性与孔隙结构之间存在显着相关性，尤其是大于50 nm的混凝土孔隙比例。