提高公路工程水泥混凝土抗侵蚀能力实验研究

Experimental Study on Improving Anti-erosion Ability of Cement Concrete in Highway Engineering

在临海地区或者盐碱地区公路工程建设过程中通常会面临高浓度氯盐、硫酸盐侵蚀水泥混凝土的问题,造成水泥混凝土耐久性能下降。因此,室内开展了水泥混凝土抗氯离子以及硫酸根离子侵蚀实验,并通过加入硅灰或者粉煤灰的方式来提高水泥混凝土的抗侵蚀能力。结果表明:硅灰或者粉煤灰的加入能够显著降低水泥胶砂试件的电通量和氯离子快速迁移系数,提高水泥胶砂试件的抗氯离子侵蚀能力,当硅灰加量为4%或者粉煤灰的加量为6%时,水泥胶砂试件的电通量和氯离子快速迁移系数均达到最低;硅酸盐水泥在高浓度硫酸根溶液中浸泡24个月后,抗蚀系数明显降低,而加入硅灰和粉煤灰均可以有效提高水泥胶砂试件的抗蚀系数,使其具有良好的抗硫酸盐侵蚀能力。

In the process of highway engineering construction in coastal areas or saline alkali areas, high concentration of chloride and sulfate usually erode cement concrete, resulting in the deterioration of cement concrete durability.Therefore, the experiments of chloride ion and sulfate ion corrosion resistance of cement concrete were carried out in the laboratory, and the corrosion resistance of cement concrete was improved by adding silica fume or fly ash. The experimental results showed that the addition of silica fume or fly ash could significantly reduce the electrical flux and chloride ion fast migration coefficient of cement mortar, and improve the chloride ion corrosion resistance of cement mortar. When the addition amount of silica fume or fly ash was 4% or 6%,the electrical flux and chloride ion fast migration coefficient of cement mortar were the lowest;The corrosion resistance coefficient of portland cement decreased obviously after 24-month soaking in high concentration sulfate solution, and the addition of silica fume and fly ash could effectively improve the corrosion resistance coefficient of cement mortar specimen, which made it have good sulfate corrosion resistance.