ABSTRACT Natural soil can play an important role in the production of geopolymer due to having required aluminosilicate precursors and abundant availability. Numerous aluminosilicate materials have been used in the past for the production of geopolymers but they have some limitations like various ashes can be toxic during handling and processing due to presence of harmful components. The major purpose of this study was to develop geopolymers via cheap and easily available aluminosilicate material like loam type of natural soil. Geopolymer specimens were prepared by mixing natural soil and other required precursors such as sodium silicate and sodium hydroxide through ball milling. After the preparation of mortars via subsequent hydrothermal treatment for 24 hours at 60⁰C, the physical and mechanical properties were evaluated. FTIR analysis showed that geopolymerization reaction occurred in soil-based geopolymer mortars. This was confirmed by detecting some zeolitic phases like Albite/Anorthite in geopolymers. X-ray diffraction analysis also confirmed the presence of these zeolitic phases. The maximum compression strength of 22.70 MPa was achieved for A-75 composition which proved to be an optimum composition in this study which is somehow comparable to the compressive strength of ordinary Portland cement (OPC) mortars.

中文翻译：

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壤土天然土开发可持续土工聚合物砂浆的试验评价

摘要 由于需要铝硅酸盐前体和丰富的可用性，天然土壤可以在地质聚合物的生产中发挥重要作用。过去，许多铝硅酸盐材料已用于生产地质聚合物，但它们有一些局限性，例如由于有害成分的存在，各种灰烬在处理和加工过程中可能有毒。本研究的主要目的是通过廉价且容易获得的铝硅酸盐材料（如壤土类型的天然土壤）开发地质聚合物。通过球磨混合天然土壤和其他所需的前体如硅酸钠和氢氧化钠制备地质聚合物样品。在60⁰C下通过随后的水热处理24小时制备砂浆后，评估物理和机械性能。FTIR分析表明土基地质聚合物砂浆发生了地质聚合反应。这通过检测地质聚合物中的一些沸石相如钠长石/钙长石相得到证实。X 射线衍射分析也证实了这些沸石相的存在。A-75 组合物达到了 22.70 MPa 的最大抗压强度，这在本研究中被证明是最佳组合物，在某种程度上与普通波特兰水泥 (OPC) 砂浆的抗压强度相当。