Instituto de Catálisis y Petroleoquímica, CSIC, c/Marie Curie 2, 28049 Madrid, Spain.
Escuela Técnica Superior de Ingenieros de Minas y Energía, Universidad Politécnica de Madrid, 28003 Madrid, Spain.
Molecules. 2020 Mar 9;25(5):1220. doi: 10.3390/molecules25051220.
This work deals with anomalous concentrations of natural mordenite in the southeast of Spain. The X-ray diffraction (XRD) and scanning electron microscopy (SEM) studies evidenced that the samples contain mainly monomineral zeolitic phase of mordenite (70% to 74%), usually accompanied by smectite (montmorillonite), the principal component of bentonite. A study of the applicability of these zeolites is presented to establish the potential use as pozzolanic cements. For comparative purposes, synthetic commercial mordenite is also characterized and tested. The initial mixtures were prepared using cement and mordenite at a 75:25 ratio. Chemical analysis and a pozzolanicity test showed the high pozzolanic character. These mixtures were further added to sand and water, yielding the cement specimens to be used as concrete. Mechanical test results showed that the mechanical compression at 7 and 28 days fall into the range of 19.23 to 43.05 MegaPascals (MPa) for the cement specimens built with natural mordenites. The obtained results fall in the same range of cement specimens prepared with natural clinoptilolite, using mixtures within the European requirement for commercial concretes. Thus, these results and the low cost of natural mordenite of San José de los Escullos deposit supports the potential use of natural mordenite as pozzolanic cement.
这项工作涉及西班牙东南部天然丝光沸石的异常浓度。X 射线衍射（XRD）和扫描电子显微镜（SEM）研究表明，这些样品主要包含莫来石（70%至 74%）单矿物沸石相，通常伴有膨润土的主要成分——蒙脱石。本文介绍了这些沸石的适用性研究，以确定作为潜在的火山灰水泥的用途。为了进行比较，还对合成商业莫来石进行了表征和测试。初始混合物是按照 75:25 的比例用水泥和莫来石制备的。化学分析和火山灰活性测试表明，这些混合物具有很高的火山灰活性。进一步将这些混合物添加到沙子和水中，制成用作混凝土的水泥试块。力学试验结果表明，用天然莫来石制成的水泥试块在 7 天和 28 天的机械压缩值在 19.23 至 43.05 兆帕（MPa）之间。用天然斜发沸石制备的水泥试块也取得了相同范围内的力学试验结果，使用的混合物符合商业混凝土的欧洲要求。因此，这些结果和 San José de los Escullos 矿床天然莫来石的低成本支持了将天然莫来石用作火山灰水泥的潜力。
