Abstract A fine-grained argillaceous reactive dolostone was identified in Argentina. In alkaline conditions, a clear dedolomitization reaction occurred, accompanied by a deleterious expansive process. The purpose of this paper is to investigate the correlation between the rock prism expansion and the reaction progress. Rock expansion (in high and low porosity samples) was evaluated by a modified ASTM C586 test method, using NaOH, KOH, LiOH, and Ca(OH)2 solutions. The reactivity was verified in concrete mixtures applying a method similar to ASTM C1293, using the dolostone as coarse aggregate. To evaluate the reaction progress during the tests, mineralogical changes in the rock were quantified using XRD (Rietveld). In addition, the mercury porosimetry test was performed to investigate the changes in the rock pore structure. Finally, chemical analyses of the contact solutions (CO32−, OH−, Na+, K+, Li+) were done. Considering the results obtained, some controversial aspects of the theories proposed in the literature are analyzed.

中文翻译：

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不同碱性溶液对来自 Valcheta（Río Negro，阿根廷）的碱反应性白云岩岩石棱柱膨胀率的影响

摘要 在阿根廷发现了细粒泥质活性白云岩。在碱性条件下，发生明显的脱云石化反应，伴随着有害的膨胀过程。本文的目的是研究岩石棱柱膨胀与反应进程之间的相关性。岩石膨胀（在高孔隙率和低孔隙率样品中）通过改进的 ASTM C586 测试方法评估，使用 NaOH、KOH、LiOH 和 Ca(OH)2 溶液。使用类似于 ASTM C1293 的方法，使用白云石作为粗骨料，在混凝土混合物中验证了反应性。为了评估测试过程中的反应进程，使用 XRD (Rietveld) 对岩石中的矿物学变化进行了量化。此外，还进行了水银孔隙率测试，以研究岩石孔隙结构的变化。最后，对接触溶液（CO32-、OH-、Na+、K+、Li+）进行了化学分析。考虑到获得的结果，分析了文献中提出的理论的一些有争议的方面。