This paper investigates the quantification of ettringite (Ca₆Al₂(SO₄)₃(OH)₁₂.26H₂O, AFt), gypsum (CaSO₄.2H₂O, Gy) and Friedel's salt (Ca₄Al₂(OH)₁₂Cl₂.4H₂O, Fs) formed for binary, ternary and quaternary blended cementitious mortar mixes that were exposed to acid (H₂SO₄), alkali (Na₂SO₄) and chloride (NaCl) solutions. Quantification was carried out through a thermogravimetric analyzer by characterizing the mass loss associated to the decomposition of these compounds at specific boundaries of temperature (50–120 °C for AFt, 120–150 °C for Gy and 230–380 °C for Fs). Binary, ternary and quaternary blended cementitious mortar mixes were designed by adopting modified Andreasen and Andersen particle packing model. A long-term exposure period was spanned to the duration of 180 days for all kind of aggressive media and its effect on engineering properties of blended cementitious mortar were measured. Deterioration due to acid (H₂SO₄) exposure is found to be more intense due to the synergistic action of acid and sulfates. It is to be noted that for acid exposure period of 180 days, control mortar underwent an acute density and strength losses of 18% and 59%, respectively. However, cementitious mortar mix consisting of 3% nano-silica performs the best against aggressive media. The optimistic resistance to the formation of AFt and Gy was also found to be offered by quaternary blended mix. A similar trend was also observed in the formation of Fs for the mortar mixes exposed to NaCl solution. Significant improvement in particle packing density by the inclusion of micron to nano sized finer particles for quaternary blended mortar mix has minimized the permeable porosity, thus reduced the susceptibility to the formation of voluminous compounds. Enhanced pozzolanic activity due to the presence of nano-silica could be one of the primary reasons for quaternary blended mortar to perform better against the aggressive media that can be adopted in the practice considering sustainability and economical point of view.

本文研究了钙矾石 (Ca ₆ Al ₂ (SO ₄ ) ₃ (OH) ₁₂ .26H ₂ O, AFt)、石膏 (CaSO ₄ .2H ₂ O, Gy) 和弗瑞德盐 (Ca ₄ Al ₂ (OH) ) ₁₂ Cl ₂ .4H ₂ O, Fs) 形成用于暴露于酸 (H ₂ SO ₄ )、碱 (Na ₂ SO ₄ ) 的二元、三元和四元混合胶凝砂浆混合物) 和氯化物 (NaCl) 溶液。定量是通过热重分析仪通过表征与这些化合物在特定温度边界（AFt 为 50–120 °C，Gy 为 120–150 °C，Fs 为 230–380 °C）下分解相关的质量损失来进行的。 . 采用改进的Andreasen和Andersen颗粒填料模型设计了二元、三元和四元混合胶凝砂浆混合物。各种侵蚀性介质的长期暴露时间跨度为 180 天，并测量了其对混合水泥砂浆工程性能的影响。由于酸（H ₂ SO ₄) 由于酸和硫酸盐的协同作用，暴露强度更高。需要注意的是，对于 180 天的酸暴露期，控制砂浆的密度和强度分别下降了 18% 和 59%。然而，由 3% 纳米二氧化硅组成的水泥砂浆混合物对侵蚀性介质表现最佳。还发现四元混合混合物提供了对 AFt 和 Gy 形成的乐观抵抗。在暴露于 NaCl 溶液的砂浆混合物的 Fs 形成中也观察到类似的趋势。通过在四元混合砂浆混合物中加入微米到纳米尺寸的细颗粒，颗粒堆积密度显着提高，使渗透孔隙率降至最低，从而降低了形成大量化合物的敏感性。