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从提高混凝土本体的密实性与防腐能力和维持钢筋钝化性能的化学环境出发,对影响地下隧道衬砌混凝土抗蚀性的主要因素进行了研究。通过对胶凝材料组分与颗粒级配、高效减水剂与新型高效钢筋阻锈剂进行优化设计,实现了对水化产物相和界面结构的调控与优化。研究结果表明:地下隧道衬砌混凝土的优化配比为5%～10%(质量分数,下同)硅灰与30%～40%大掺量粉煤灰复合内掺,1.30%萘系或1.25%聚羧酸系高效减水剂与8%还原铁粉或0.05%D–葡萄糖酸钠阻锈剂复合外掺,该多元组分混凝土满足抗渗等级>P20,氯离子扩散系数DRCM<1×10–12m2/s,抗硫酸盐腐蚀系数K>0.80的高防水抗蚀要求。
In order to improve the compactness and corrosion resistance of the concrete body and the chemical environment to maintain the passivation performance of the steel, the main factors affecting the corrosion resistance of the tunnel lining concrete are studied. By optimizing the composition of cementitious materials and particle grading, superplasticizer and a new type of highly efficient steel reinforcement inhibitor, the regulation and optimization of hydration phase and interfacial structure were achieved. The results show that the optimum proportion of underground tunnel lining concrete is 5% ~ 10% (mass fraction) and 30% ~ 40% fly ash with high content, 1.30% naphthalene or 1.25% Polycarboxylate superplasticizer admixed with 8% reduced iron powder or 0.05% sodium D-gluconate rust inhibitor, the multicomponent concrete meets the requirements of impermeability class> P20 and chloride ion diffusion coefficient DRCM <1 × 10 -12m2 / s, anti-sulfate corrosion factor K> 0.80 high waterproof and corrosion requirements.