Abstract Multiple techniques were applied to the investigation of the phase composition of the deteriorated surface of Portland-limestone cement concrete specimens exposed for 10 years to conditions promoting thaumasite sulfate attack. The results were interpreted in terms of the limestone content of cement and the incorporation of supplementary cementitious materials (SCMs) (natural pozzolana, blastfurnace slag, metakaolin). Thaumasite, detected in high amounts in concrete specimens made without SCMs, was associated with Al to some extent. Considerable degradation of calcium silicate hydrate occurred in all specimens, resulting in the formation of Al-associated cross-linked silicate chains, magnesium silicate hydrate and silica gel, a process most effectively prevented by metakaolin. For the highest limestone content in cement or use of natural pozzolana, thaumasite underwent extensive decomposition. Al incorporation into cross-linked silicate chains increased with increasing limestone content in cement. Longer aluminosilicate chains with larger Al fractions were observed in concrete specimens incorporating SCMs.

中文翻译：

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硅酸盐-石灰石水泥混凝土的长期硫酸盐酸盐侵蚀：一种评估相组合的多技术分析方法

摘要 采用多种技术研究了硅酸盐-石灰石水泥混凝土试样在促进硫酸盐硫酸盐侵蚀的条件下暴露 10 年的劣化表面的相组成。根据水泥的石灰石含量和补充胶凝材料 (SCM)（天然火山灰、高炉矿渣、偏高岭土）的掺入来解释结果。在没有 SCM 的混凝土样品中检测到大量的奇异钙石在某种程度上与铝有关。所有样品中都发生了水合硅酸钙的大量降解，导致形成与铝相关的交联硅酸盐链、水合硅酸镁和硅胶，偏高岭土最有效地阻止了这一过程。对于水泥中最高的石灰石含量或使用天然火山灰，奇马石经历了广泛的分解。随着水泥中石灰石含量的增加，铝进入交联硅酸盐链的比例增加。在掺入 SCM 的混凝土试样中观察到更长的铝硅酸盐链和更大的 Al 分数。