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Chloride migration measurement for chloride and sulfide contaminated concrete
Materials and Structures ( IF 3.8 ) Pub Date : 2020-07-10 , DOI: 10.1617/s11527-020-01526-4
M. Decker , R. Grosch , S. Keßler , H. Hilbig

Reinforcement corrosion is major reason for concrete structures deterioration. Chlorides from external sources such as seawater and de-icing salts penetrate in the concrete and as soon as a critical threshold reaches the reinforcement level corrosion processes start. Therefore, the characterization of the chloride ingress resistance in form of the rapid chloride migration (RCM) coefficient, D RCM is crucial to classify concretes for given applications and to enable full probabilistic service life prediction. To measure D RCM of chloride-contaminated concrete, a rapid iodide migration test was developed using iodide as penetration ion and an iodine–starch reaction for penetration depth indication. This indicator mixture has the disadvantage that it is not applicable on sulfide containing concretes such as ground granulated blast furnace slag concretes. In this paper, the reason for the unsuitability of this indicator is examined and alternative oxidation agents are found and validated to overcome this problem. The new indicator mixtures with hydrogen peroxide (H 2 O 2 ) or/and potassium persulfate (K 2 S 2 O 8 ) as oxidation agents are not only insensitive to sulfide contamination but are also applicable to common concrete compositions and could replace the existing indicator universally.

中文翻译:

氯化物和硫化物污染混凝土的氯化物迁移测量

钢筋锈蚀是混凝土结构劣化的主要原因。来自海水和除冰盐等外部来源的氯化物会渗透到混凝土中,一旦临界阈值达到钢筋水平,腐蚀过程就会开始。因此,以快速氯化物迁移 (RCM) 系数 D RCM 的形式表征氯化物进入阻力对于给定应用的混凝土分类和实现完全概率使用寿命预测至关重要。为了测量受氯化物污染的混凝土的 D RCM,使用碘化物作为渗透离子和碘-淀粉反应用于渗透深度指示,开发了一种快速碘化物迁移测试。这种指示剂混合物的缺点是它不适用于含硫化物的混凝土,例如磨碎的高炉矿渣颗粒混凝土。在本文中,检查了该指标不适用的原因,并找到并验证了替代氧化剂来克服这个问题。以过氧化氢 (H 2 O 2 ) 或/和过硫酸钾 (K 2 S 2 O 8 ) 作为氧化剂的新型指示剂混合物不仅对硫化物污染不敏感,而且适用于普通混凝土组合物,可以替代现有的指示剂普遍。
更新日期:2020-07-10
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