Developing fully recycled alkali-activated mortar made with waste concrete fines as a substitute for both binder and sand: Multi-properties evaluation

Using waste concrete fines (WCF) for preparing sustainable alkali-activated mortar (AAM) is an effective pathway for recycling concrete waste. This study aims to develop fully recycled AAM by substituting GGBS-FA binders and natural sand with WCF in GGBS-FA-based AAM. This approach can decrease the demand for traditional binders and natural sand, while maximizing the reutilization of WCF in AAM. WCF exhibited certain alkali-activation activity and a favorable filling effect in AAM. Replacing binders with WCF was detrimental to the geopolymerization and cementitious products, resulting in the microstructure deterioration of AAM paste. Conversely, substituting natural sand with WCF reduced the actual…

• NN
  National Natural Science Foundation of China

  Award: 52008364
• NS
  Natural Science Foundation of Jiangsu Province

  Award: BK20200957