William Wilson , Fabien Georget , Karen L. Scrivener
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引用次数: 0
摘要
在 0.5 年、1 年和 4 年的时间里,将各种体系暴露在类似于海水的氯离子浓度(0.5 M Cl-)下,进行大量扩散实验。结合之前公布的氯化物结合和小型迁移测试结果,结果表明氯化物进入饱和混合水泥浆是一个扩散控制过程,遵循平方根定律或修正版,包括一个偏移量,以考虑微观结构的缓慢变化。氯化物的渗入还与体积电导率密切相关,这表明氯化物结合力的变化对所研究体系的影响微乎其微。这些研究结果支持采用两步法,在水泥浆尺度上快速鉴定新型粘结剂的氯化物侵入行为。利用体积电导率测量筛选出有前景的粘结剂,并研究其扩散特性的动力学。第二步,利用体积扩散测试和带有偏移的平方根定律来预测氯化物的侵入。
Towards a two-step assessment of the chloride ingress behaviour of new cementitious binders
A wide range of systems were exposed to a seawater-like chloride concentration (0.5 M Cl−) for bulk diffusion experiments over 0.5, 1 and 4 years. Combined with previously published findings on chloride binding and mini-migration testing, the results showed that chloride ingress into saturated blended cement pastes is a diffusion-governed process, obeying the square root-law or a modified version including an offset to account for slow microstructure changes. Chloride ingress is also strongly correlated with bulk electrical conductivity, suggesting a negligible effect of chloride binding variations between the systems studied. These findings support a two-step approach to rapidly characterise the chloride ingress behaviour of new binders at the cement paste scale. A screening with bulk conductivity measurements investigates promising binders and the kinetics of their diffusion properties. In a second step, bulk diffusion tests and the square root law with an offset are used to predict chloride ingress.
期刊介绍:
Cement and Concrete Research is dedicated to publishing top-notch research on the materials science and engineering of cement, cement composites, mortars, concrete, and related materials incorporating cement or other mineral binders. The journal prioritizes reporting significant findings in research on the properties and performance of cementitious materials. It also covers novel experimental techniques, the latest analytical and modeling methods, examination and diagnosis of actual cement and concrete structures, and the exploration of potential improvements in materials.