论文部分内容阅读
运用压汞测孔法(MIP)和电镜扫描(SEM)分析方法对影响电化学再碱化混凝土的微观结构主次因素进行试验研究。试验结果表明,电流密度的影响最大,其次是再碱化时间和电解质溶液浓度。该试验最优电化学再碱化组合是电流密度为3A/m2,采用1mol/L的Na2CO3电解质溶液,再碱化时间为14d。标准养护、实验室加速完全碳化以及实施再碱化修复试件的混凝土孔隙率的测定结果表明,再碱化对混凝土的总孔隙率和孔径分布的影响都很大。再碱化后混凝土的累积孔隙体积有所减少,孔径分布偏向于凝胶孔,微观结构均匀密实,说明再碱化可以改善混凝土的孔结构,提高混凝土的耐久性能。
The primary and secondary factors influencing the microstructure of electrochemical re-alkalized concrete were studied by mercury intrusion porosimetry (MIP) and electron microscopy (SEM). The experimental results show that the current density has the greatest impact, followed by the re-alkalizing time and the electrolyte solution concentration. The optimum combination of electrochemical alkalization of the test is the current density of 3A / m2, the use of 1mol / L Na2CO3 electrolyte solution, and then alkalinization time of 14d. The results of standard porosity testing, complete laboratory carbonization and re-alkalization test show that the re-alkalization has a great influence on the total porosity and pore size distribution of concrete. After re-alkalization, the cumulative pore volume of concrete decreased, and the pore size distribution was biased toward the gel pores. The microstructure was uniform and dense, indicating that re-alkalization can improve the pore structure of concrete and improve the durability of concrete.