1 School of Materials Science and Engineering, Southeast University, Nanjing 211189, China 2 Jiangsu Key Laboratory of Construction Materials, Nanjing 211189, China 3 Jiangsu Collaborative Innovation Center for Advanced Civil Engineering Materials, Nanjing 211189, China 4 State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Nanjing Hydraulic Research Institute, Nanjing 210029, China
Abstract: High ductility cement-based composites (HDCC), based on the bridge principal theory and designed by micromechanics, are superior to ordinary concrete due to their multiple cracking and strain hardening properties under tensile load, but their development is still limited by high production costs and carbon emissions. In the past decade, green and economical high ductility composites (HDGC) reinforced by geopolymer/alkali activated materials and fiber have been researched and developed. On the basis of summarizing the reaction mechanism of geopolymer/alkali activated materials and the design theory of HDCC materials, this paper mainly reviews the recent advances in the basic properties and microstructure of HDGC. The results show that the preparation of HDGC is feasible and the HDGC exhibits mechanical response characteristics of high ductility composites, including compression, tensile strain hardening, interface micromechanics, bending, impact resistance, etc. However, the mechanics and microstructure of HDGC depend on changes in the chemical properties of the geopolymer/alkali activated material matrix due to the complex composition of the material. HDGC also has smaller crack widths that facilitate material self-healing, larger shrinkage values, and potentially good durability. In addition, based on limited studies, the similarities and differences between HDGC and HDCC were compared in order to better understand the conditions that should be paid attention to when geopolymer/alkali activated materials are used as HDCC substitutes. Finally, the existing problems and research direction of HDGC are summarized and prospected.
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