Exposure of mortars to cyclic chloride ingress and carbonation
Exposure of mortars to cyclic chloride ingress and carbonation
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DOI：
10.1680/adcr.12.00029
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发表时间：
2013-02-01
影响因子：
2
通讯作者：
Holmes, Niall
中科院分区：
文献类型：
--
作者：
Backus, Jonathon;McPolin, Danny;Holmes, Niall
氯离子的存在是引起钢筋混凝土结构劣化的主要因素之一。对各种粘合剂进行了一项调查，以监测24周润湿和干燥暴露方案期间氯化物的进入，以模拟多模式传输机制活跃的条件。使用游离和总氯化物曲线评价渗透。氯化物的酸萃取用于评估渗透性是定量可靠和实用的。X-射线衍射用于确定结合的氯化物和碳酸化的存在。水泥混合料抗氯离子渗透能力从强到弱依次为矿渣微粉、硅微粉、粉煤灰、波特兰水泥。观察到碳酸化对结合能力的影响，并且氯化物的相对量也与以弗里德尔盐形式结合的氯化物的量相关。
The presence of chloride ions is one of the primary factors causing the degradation of reinforced concrete structures. An investigation to monitor ingress of chlorides during a 24-week wetting and drying exposure regime to simulate conditions in which multiple-mode transport mechanisms are active was conducted on a variety of binders. Penetration was evaluated using free and total chloride profiles. Acid extraction of chlorides is quantitatively reliable and practical for assessing penetration. X-ray diffraction was used to determine the presence of bound chlorides and carbonation. The ability of the cement blends to resist chloride penetration was, from best to worst, ground granulated blast-furnace slag, microsilica, pulverised-fuel ash, Portland cement. The effect of carbonation on binding capability was observed and the relative quantity of chlorides also showed a correlation with the amount of chlorides bound in the form of Friedel's salt.