RILEM TC 247-DTA round robin test: carbonation and chloride penetration testing of alkali-activated concretes
RILEM TC 247-DTA round robin test: carbonation and chloride penetration testing of alkali-activated concretes
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DOI：
10.1617/s11527-020-1449-3
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发表时间：
2020-02-13
影响因子：
3.8
通讯作者：
Provis, John L.
中科院分区：
文献类型：
--
作者：
Gluth, Gregor J. G.;Arbi, Kamel;Provis, John L.
许多标准化的耐久性测试方法已经为波特兰水泥基混凝土开发，但需要验证以确定它们是否也适用于碱活化材料。为了解决这个问题，RILEM TC 247-DTA“碱活性材料耐久性测试”对碳化和氯离子渗透测试方法进行了循环测试，应用于五种不同的碱活性混凝土，包括粉煤灰、高炉矿渣和偏高岭土。这些方法总体上表现出与传统混凝土的精度相当的内在精度。相似粘结剂化学对混凝土的测试结果排名是令人满意的，但排名并不总是可靠的，当比较碱活化混凝土基于不同的前体。对于粉煤灰基和高炉渣基碱活化混凝土，加速碳化测试给出了相似的结果，而自然碳化测试则没有。观察到混凝土试件的碳化在养护过程中已经发生，这意味着碳化测试结果可以推断出更长的使用寿命。根据NT BUILD 443进行的加速氯化物渗透测试对测试混凝土的排名一致，而快速氯化物迁移测试则不是这样。这两种氯化物渗透测试方法在应用于比其他测试材料更耐氯化物侵入的高炉渣基混凝土时，精度相对较低。
Many standardised durability testing methods have been developed for Portland cement-based concretes, but require validation to determine whether they are also applicable to alkali-activated materials. To address this question, RILEM TC 247-DTA 'Durability Testing of Alkali-Activated Materials' carried out round robin testing of carbonation and chloride penetration test methods, applied to five different alkali-activated concretes based on fly ash, blast furnace slag or metakaolin. The methods appeared overall to demonstrate an intrinsic precision comparable to their precision when applied to conventional concretes. The ranking of test outcomes for pairs of concretes of similar binder chemistry was satisfactory, but rankings were not always reliable when comparing alkali-activated concretes based on different precursors. Accelerated carbonation testing gave similar results for fly ash-based and blast furnace slag-based alkali-activated concretes, whereas natural carbonation testing did not. Carbonation of concrete specimens was observed to have occurred already during curing, which has implications for extrapolation of carbonation testing results to longer service life periods. Accelerated chloride penetration testing according to NT BUILD 443 ranked the tested concretes consistently, while this was not the case for the rapid chloride migration test. Both of these chloride penetration testing methods exhibited comparatively low precision when applied to blast furnace slag-based concretes which are more resistant to chloride ingress than the other materials tested.