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Mechanical and durability properties of fly ash and slag based geopolymer concrete

机译：粉煤灰和矿渣基地质聚合物混凝土的机械和耐久性能

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In this paper, mechanical and short-term durability properties of fly ash and slag based geopolymer concretes (FAGPC-SGPC) were investigated. The alkaline solution was prepared with a mixture of sodium silicate solution (Na_2SiO_3) and sodium hydroxide solution (NaOH) for geopolymer concretes. Ordinary Portland Cement (OPC) concrete was also produced for comparison. Main objective of the study was to examine the usability of geopolymer concretes instead of the ordinary Portland cement concrete for structural use. In addition to this, this study was aimed to make a contribution to standardization process of the geopolymer concretes in the construction industry. For this purpose; SGPC, FAGPC and OPC specimens were exposed to sulfuric acid (H_2SO_4), magnesium sulfate (MgSO_4) and sea water (NaCl) solutions with concentrations of 5%, 5% and 3.5%, respectively. Visual inspection and weight change of the specimens were evaluated in terms of durability aspects. For the mechanical aspects; compression, splitting tensile and flexural strength tests were conducted before and after the chemical attacks to investigate the residual mechanical strengths of geopolymer concretes under chemical attacks. Results indicated that SGPC (100% slag) is stronger and durable than the FAGPC due to more stable and strong cross-linked alumina-silicate polymer structure. In addition, FAGPC specimens (100% fly ash) showed better durability resistance than the OPC specimens. However, FAGPC specimens (100% fly ash) demonstrated lower mechanical performance as compared to OPC specimens due to low reactivity of fly ash particles, low amount of calcium and more porous structure. Among the chemical environments, sulfuric acid (H_2SO_4) was most dangerous environment for all concrete types.
机译：本文研究了粉煤灰和矿渣基地质聚合物混凝土（FAGPC-SGPC）的机械和短期耐久性能。用硅酸钠溶液（Na_2SiO_3）和氢氧化钠溶液（NaOH）的混合物制备碱性溶液，用于地质聚合物混凝土。还生产了普通波特兰水泥（OPC）进行比较。该研究的主要目的是检验地聚合物混凝土而不是用于结构用途的普通波特兰水泥混凝土的可用性。除此之外，本研究旨在为建筑业中的地质聚合物混凝土的标准化过程做出贡献。以此目的;将SGPC，FAGPC和OPC标本分别暴露于浓度分别为5％，5％和3.5％的硫酸（H_2SO_4），硫酸镁（MgSO_4）和海水（NaCl）溶液中。根据耐久性方面评估样品的外观检查和重量变化。在机械方面；在化学侵蚀之前和之后进行了压缩，劈裂拉伸和挠曲强度测试，以研究地质聚合物在化学侵蚀下的残余机械强度。结果表明，SGPC（100％炉渣）比FAGPC更坚固耐用，这是因为其交联的氧化铝-硅酸盐聚合物结构更稳定，更牢固。此外，FAGPC标本（100％粉煤灰）显示出比OPC标本更好的耐久性。但是，FAGPC标本（100％粉煤灰）与OPC标本相比具有较低的机械性能，这归因于粉煤灰颗粒的反应性低，钙含量低和多孔结构。在化学环境中，硫酸（H_2SO_4）是所有混凝土类型中最危险的环境。

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