矿渣作为钢铁生产中产生的副产品,是水泥中常用的一种矿物掺合料,以用于减少建筑材料中水泥的用量,起到节约能源的作用.本文通过对相同水灰比、不同掺量矿渣的混凝土进行试验,分别浸泡于清水和盐水中,研究氯离子侵蚀矿渣混凝土的微观特性; 通过准Randle电路对氯离子不同侵蚀时间进行电化学阻抗分析,利用电路的各参数Rs、Rct、Cd、σ、p进行混凝土孔结构及微观特性分析.试验结果表明,盐水环境可以提高试块中的双电层电容,而对于扩散阻抗系数、孔溶液电阻和自由电子转移形成的电阻,盐水环境对其有衰减作用.而不论处于盐水还是清水环境,试块的常相角指数均不变,说明盐水中的氯离子侵蚀进入矿渣混凝土材料后,虽然提高了孔结构中的离子浓度,但并没有改变混凝土内部结构的特性.
As a by-product of steel production, slag is a mineral admixture used in cement. to reduce the amount of cement in building materials and save energy. In this paper, the microcosmic characteristics of chloride ion eroding slag concrete are studied by soaking concrete with the same water cement ratio and different content of slag in fresh water and saline water respectively. Quasi-Randle circuit was used to analyze the electrochemical impedance of chloride ion at different corrosion time. The pore structure and micro-characteristics of concrete were analyzed by using the circuit parametersRs、Rct、Cd、q、σ、p. Results show that the salt water environment can improve the double layer capacitance of the test block, and the salt water environment can attenuate the diffusion impedance coefficient, the resistance of pore solution and the resistance formed by free electron transfer.The normal phase angle index of the test block remains unchanged regardless of whether it is in brine or clear water. It shows that chloride ion in brine corrodes into slag concrete material, which increases the ion concentration in the pore structure, but does not change the characteristics of the internal structure of concrete.
