公路工程

在保证渗透能力下，为改善透水混凝土力学性能和耐久性不足的问题，选取2种不同粒径粗骨料，分别掺入0、0.05%、0.10%、0.15%和0.20%的氧化石墨烯制备透水混凝土试件，并开展孔隙率、透水系数、力学性能、抗冻性能和耐磨性能试验，研究氧化石墨烯掺量及骨料粒径对透水混凝土性能的影响规律。结果表明：大粒径骨料透水混凝土孔隙率和透水系数整体高于小粒径组，但其强度、抗冻性和耐磨性相对较弱；掺入适量氧化石墨烯后，2类透水混凝土的力学性能和耐久性能均得到改善，且GO掺量为0.10%时综合性能最优。与未掺GO试件相比，0.10%氧化石墨烯条件下大粒径组28d抗压强度和抗折强度分别提高50.3%和51.8%,50次冻融循环后的质量损失率和强度损失率分别降低67.2%和50.2%,耐磨质量损失率降低35.8%。结论：氧化石墨烯在透水混凝土的透水性、力学性能与耐久性方面具有积极作用；工程应用中可根据排水需求与承载耐久要求综合选择骨料粒径，并优先考虑0.10%GO掺量。

To address the insufficient mechanical strength and durability of pervious concrete while maintaining adequate permeability, this study prepared pervious concrete specimens using two different sizes of coarse aggregate and incorporating Graphene Oxide(GO) at dosages of 0, 0.05%, 0.10%, 0.15%, and 0.20%. Tests on porosity, permeability coefficient, mechanical properties, freeze-thaw resistance, and abrasion resistance were conducted to investigate the effects of GO dosage and aggregate size on the performance of pervious concrete. The results show that the pervious concrete prepared with larger aggregate exhibits higher porosity and permeability coefficient than that prepared with smaller aggregate, but its strength, freeze-thaw resistance, and abrasion resistance are relatively weaker. After the incorporation of an appropriate amount of GO, the mechanical properties and durability of both types of pervious concrete were improved, and the overall performance was optimal at a GO dosage of 0.1%. Compared with the specimens without GO, under the 0.10% GO condition, the 28 d compressive strength and flexural strength of the large-aggregate group increased by 50.3% and 51.8%, respectively; after 50 freeze-thaw cycles, the mass loss rate and strength loss rate decreased by 67.2% and 50.2%, respectively; and the abrasion mass loss rate decreased by 35.8%. In conclusion, GO plays a positive role in the permeability, mechanical properties, and durability of permeable concrete; in engineering applications, aggregate particle size can be comprehensively selected based on drainage requirements and bearing durability requirements, with priority given to a 0.10% GO content.