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Self-Healing Properties of Ultra-High Toughness Fly Ash Based Geopolymer under Air and Water Environments

The self-healing properties of ultra-high toughness fly ash based geopolymer curing in air and water were studied under 2% pre-tension strain. The experimental results show that under these two curing conditions the tensile stress and water absorption of FA-EGC have been recovered and the pore structure has also been improved, indicating that self-healing has taken place in the specimens. Compared to the air environment, the water environment is proved to be a better environment for the self-healing of FA-EGC. It was observed that there were unreacted fly ash particles at the cracks through SEM. And more N-A-S-H gels were found under the water environment, indicating that N-A-S-H gels may enhance the fiber/matrix interface and improve the density of the matrix, resulting in the higher recovery of tensile stress and water absorption.