Abstract：
The speed at which climate change is happening is leading to a demand for new pozzolanic materials that improve the quality of cements and, at the same time, limit the emission of greenhouse gases into the atmosphere. The main objective of this work is the detailed characterization of an ignimbrite sample (IGNS) to demonstrate its effectiveness as a natural pozzolan. To meet this objective, a series of tests were carried out. In the first stage, mineral and chemical analyses were performed, such as petrographic analysis by thin section (TSP), X-ray diffraction (XRD), oriented aggregate (OA), scanning electron microscopy (SEM) and X-ray fluorescence (XRF). In the second stage, the following technical tests were carried out: chemical quality analysis (QCA), pozzolanicity test (PT) and mechanical compressive strength (MS) at 7, 28 and 90 days, using mortar specimens with ignimbrite/cement formulation (IGNS/PC): 10, 25 and 40% to establish the pozzolanic nature of the ignimbrite. The results of the mineral and chemical analyses showed that the sample has a complex mineralogical constitution, consisting of biotite mica, potassium feldspar, plagioclase, smectite (montmorillonite), quartz, volcanic glass, iron, titanium and manganese oxides, chlorite and chlorapatite. On the other hand, the technological tests revealed the pozzolanic nature of the sample, as well as visible increases in the mechanical compressive strengths in the three proportions, the most effective being IGNS/PC:10% and IGNS/PC:25% at 7, 28 and 90 days of setting. The results obtained could be applied in the formulation of new pozzolanic cements with ignimbrite as a natural pozzolanic aggregate.
摘要：
气候变化的速度正在导致对新火山灰材料的需求，这些材料可以提高水泥的质量，同时,限制温室气体向大气的排放。这项工作的主要目的是详细表征火成岩样品（IGNS），以证明其作为天然火山灰的有效性。为了实现这一目标,进行了一系列测试。在第一阶段,进行了矿物和化学分析，例如薄片岩相分析(TSP)，X射线衍射(XRD)定向骨料(OA)，扫描电子显微镜（SEM）和X射线荧光（XRF）。在第二阶段,进行了以下技术测试：化学质量分析（QCA），7、28和90天的火山灰度试验（PT）和机械抗压强度（MS），使用灰浆样品与火成岩/水泥配方（IGNS/PC）：10％，25％和40％，以建立火山岩的火山灰性质。矿物和化学分析结果表明，样品具有复杂的矿物学组成，由黑云母组成，钾长石,斜长石,蒙脱石（蒙脱石），石英,火山玻璃,铁,钛和锰的氧化物，亚氯酸盐和氯磷灰石。另一方面,技术测试揭示了样品的火山灰性质，以及机械压缩强度在三个比例中的可见增加，最有效的是IGNS/PC：10％和IGNS/PC：25％在7、28和90天的设置。所获得的结果可用于以燃片石为天然火山灰质骨料的新型火山灰质水泥的配制。
