TY  - JOUR
AU  - XIONG, Guiyan
AU  - LI, Shuyue
AU  - GUO, Xiaolu
PY  - 2022
TI  - Effect of Cracking Ages on Self‒Healing of Pure Fly Ash‒Based Engineered Geopolymer Composite
JO  - Journal of the Chinese Ceramic Society
SN  - 0454-5648
SP  - 2868
EP  - 2876
VL  - 50
IS  - 11
AB  - The effect of cracking ages (i.e., 3, 7, 14 d and 28 d) on the self‒healing of pure fly ash-based engineered geopolymer composite (FA-EGC) was evaluated by crack characteristics, tensile properties and water absorption. The components and microstructure of self‒healing products of FA-EGC were investigated by Fourier transform infrared spectroscopy, X-ray diffraction and scanning electron microscopy with energy dispersive spectroscopy. The results show that there is an optimum self‒healing effect of FA-EGC samples when cracking age is 7 d, a better recovery of ultimate tensile strength and a reduction in average water absorption rate can be obtained at the maximum decrease in crack width. The self‒healing products of FA-EGC are the geopolymer gel generated by ongoing geopolymerization reaction and CaCO3.
UR  - https://doi.org/10.14062/j.issn.0454-5648.20220196
DO  - 10.14062/j.issn.0454-5648.20220196