The RILEM technical committee TC 247-DTA ‘Durability Testing of Alkali-Activated Materials’ conducted a round robin testing programme to determine the validity of various durability testing methods, originally developed for Portland cement based-concretes, for the assessment of the durability of alkali-activated concretes. The outcomes of the round robin tests evaluating sulfate resistance, alkali-silica reaction (ASR) and freeze–thaw resistance are presented in this contribution. Five different alkali-activated concretes, based on ground granulated blast furnace slag, fly ash, or metakaolin were investigated. The extent of sulfate damage to concretes based on slag or fly ash seems to be limited when exposed to an Na2SO4 solution. The mixture based on metakaolin showed an excessive, very early expansion, followed by a dimensionally stable period, which cannot be explained at present. In the slag-based concretes, MgSO4 caused more expansion and visual damage than Na2SO4; however, the expansion limits defined in the respective standards were not exceeded. Both the ASTM C1293 and RILEM AAR-3.1 test methods for the determination of ASR expansion appear to give essentially reliable identification of expansion caused by highly reactive aggregates. Alkali-activated materials in combination with an unreactive or potentially expansive aggregate were in no case seen to cause larger expansions; only the aggregates of known very high reactivity were seen to be problematic. The results of freeze–thaw testing (with/without deicing salts) of alkali-activated concretes suggest an important influence of the curing conditions and experimental conditions on the test outcomes, which need to be understood before the tests can be reliably applied and interpreted.

中文翻译：

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RILEM TC 247-DTA 循环试验：碱活化混凝土的耐硫酸盐、碱-二氧化硅反应和抗冻融性

RILEM 技术委员会 TC 247-DTA“碱活化材料的耐久性测试”进行了循环测试程序，以确定最初为波特兰水泥基混凝土开发的各种耐久性测试方法的有效性，用于评估碱的耐久性- 活性混凝土。本贡献介绍了评估硫酸盐抗性、碱硅反应 (ASR) 和冻融抗性的循环测试结果。研究了五种不同的碱活化混凝土，它们基于磨碎的高炉矿渣、粉煤灰或偏高岭土。当暴露于 Na2SO4 溶液时，硫酸盐对基于矿渣或飞灰的混凝土的破坏程度似乎是有限的。基于偏高岭土的混合物表现出过度的、非常早的膨胀，随后是尺寸稳定的时期，目前无法解释。在矿渣混凝土中，MgSO4 比 Na2SO4 引起更多的膨胀和视觉损伤；但是，并未超过相应标准中定义的扩展限制。用于测定 ASR 膨胀的 ASTM C1293 和 RILEM AAR-3.1 测试方法似乎对由高活性骨料引起的膨胀提供了基本可靠的识别。碱活化材料与非反应性或可能膨胀的骨料结合使用，在任何情况下都不会引起更大的膨胀；只有已知的非常高反应性的聚集体被认为是有问题的。碱活化混凝土的冻融试验（含/不含除冰盐）结果表明养护条件和试验条件对试验结果有重要影响，