The mechanism of layered double hydroxides (LDHs) formation with the addition of magnesium oxide (MgO), the LDHs reconstruction of calcined layered double hydroxides (CLDHs) and the effect of externally added synthetic LDHs in alkali-activated materials (AAMs) system are the important factors influencing the chloride resistance of AAMs. The objective of this research is to investigate the different effects of MgO, nitrate intercalated LDH (Mg-Al-NO₃ LDH) and calcined natural LDH-CO₃ on the alkali activated fly ash and slag blends (AAFS) in terms of chloride resistance. Mg-Al-NO₃LDH was successfully synthesized with the co-precipitation method. CLDH was also obtained by thermal treating natural Mg-Al-CO₃ LDH. The reaction heat flow and reaction products of the AAFS were tested by isothermal calorimetry and X-ray diffraction (XRD), respectively. The microstructure of the AAFS was characterized by the nitrogen sorption tests (BET) and mercury intrusion porosimetry (MIP). The compressive strength of AAFS was also tested. The non-steady-state migration (NSSM) was applied to determine the chloride resistance of AAFS. The Ordinary Portland Cement (OPC) samples were also studied for comparative purpose. The results of the calorimeter test showed that the MgO, Mg-Al-NO₃ LDH, and CLDH delayed the time to reach the reaction peak (TRRP) at 3.9%, 11.2%, and 9.2%, respectively. The MIP results illustrated that mesopores and micropores of AAFS were refined by the three admixtures. The NSSM results indicated that CLDH can significantly improve the chloride resistance of AAFS binder comparing to the samples containing MgO and Mg-Al-NO₃ LDH. The different influences of MgO, Mg-Al-NO₃ LDH and CLDH were compared in this study.

通过添加氧化镁（MgO）形成层状双氢氧化物（LDHs）的机理，煅烧的层状双氢氧化物（CLDHs）的LDH重构以及在碱活化材料（AAMs）系统中外部添加的合成LDHs的影响是影响AAM抗氯化性的重要因素。这项研究的目的是从耐氯化物的角度研究MgO，硝酸盐插层LDH（Mg-Al-NO ₃ LDH）和煅烧的天然LDH-CO ₃对碱活化粉煤灰和矿渣混合物（AAFS）的不同影响。采用共沉淀法成功合成了Mg-Al-NO ₃ LDH。CLDH也通过对天然Mg-Al-CO ₃进行热处理而获得LDH。通过等温量热法和X射线衍射（XRD）分别测试了AAFS的反应热流和反应产物。通过氮吸附测试（BET）和压汞法（MIP）表征了AFS的微观结构。还测试了AAFS的抗压强度。应用非稳态迁移（NSSM）来确定AAFS的耐氯化物性。还对普通波特兰水泥（OPC）样品进行了比较研究。量热仪测试结果表明，MgO，Mg-Al-NO ₃ LDH和CLDH分别延迟了到达反应峰（TRRP）的时间，分别为3.9％，11.2％和9.2％。MIP结果表明，AAFS的中孔和微孔被这三种混合物精制。NSSM结果表明，与含MgO和Mg-Al-NO ₃ LDH的样品相比，CLDH可以显着提高AFS粘合剂的耐氯化物性。本研究比较了MgO，Mg-Al-NO ₃ LDH和CLDH的不同影响。