This study aimed to investigate the influence of the CaO/SiO 2 molar ratio on the physical, chemical and mechanical properties of alkali-activated fly ash with quicklime and assess the technical viability of the mortar with the highest compressive strength. Eight mortars were prepared, with a fixed sand to combined activator/precursor ratio of 3:1, varying the CaO/SiO 2 ratio from 0.25 to 2.00 every 0.25. The doses that resulted in the highest and lowest compressive strength were CaO/SiO 2 = 0.75 and 2.00, respectively, which reached 17.9 and 3.8 MPa at 28 days. Analytical techniques were performed to identify the products formed and the morphological differences in order to justify the variation in mechanical strength between mortars. EDS/SEM showed the formation of C-S-H, C-A-S-H and CH as well as other compounds in the mortars. XRD demonstrated greater CH formation in the mortars with the highest CaO/SiO 2 molar ratio and CaCO 3

中文翻译：

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CaO / SiO 2摩尔比对生石灰碱活化粉煤灰砂浆工艺性能的影响

本研究旨在研究CaO / SiO 2摩尔比对生石灰对碱活化粉煤灰的物理，化学和机械性能的影响，并评估具有最高抗压强度的砂浆的技术可行性。制备了八种砂浆，砂与活化剂/前驱体的混合比固定为3：1，CaO / SiO 2的比值从0.25更改为2.00，每0.25。导致最高和最低抗压强度的剂量分别为CaO / SiO 2 = 0.75和2.00，在28天时达到17.9和3.8 MPa。进行分析技术以鉴定形成的产物和形态差异，以证明砂浆之间的机械强度变化是合理的。EDS / SEM显示了砂浆中CSH，CASH和CH以及其他化合物的形成。