电脉冲用于混凝土抗硫酸盐侵蚀加速试验方法初探

A Preliminary Research on Accelerated Test Method of Sulfate Attack Resistance of Concrete Based on Electrical Pulse

摘要:

实际工程中水泥混凝土硫酸盐侵蚀过程缓慢，常采用加速试验方法评价其抗硫酸盐侵蚀性能。通过分析现有方法的特点，提出基于电脉冲原理的混凝土抗硫酸盐侵蚀性能加速试验方法。测试了不同水灰比、浸泡方式与粉煤灰掺量的混凝土在不同侵蚀条件下的抗蚀系数，利用扫描电镜分析了电脉冲作用下硫酸盐侵蚀机理。试验结果表明，电脉冲加速了混凝土的硫酸盐侵蚀，基于电脉冲原理的混凝土抗硫酸盐性能加速试验方法技术可行。

Abstract:

Some accelerated experimental methods are usually applied to measure the sulfate attack resistance of concrete due to very slow sulfate attack process in actual engineering. With taking account of characteristics of the accelerated methods in application and research of cement concrete nowadays, a new accelerated experimental method for assessment of the sulfate attack resistance is proposed based on electrical pulse. Corrosion resistant coefficient of concrete with different water/cement ratio, different soaked ways and fly ash replacement of cement were measured under the different corrosion condition. The mechanism of sulfate attack in the case of electrical pulse was tested using scanning electron microscope (SEM). The test results show that sulfate attack process of concrete was accelerated under the action of electrical pulse. Accelerated test menthod of sulfate attack resistence based on electrical pulse is feasible.