期刊
CEMENT & CONCRETE COMPOSITES
卷 120, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.cemconcomp.2021.104055
关键词
Bacteria-based mortar; Creep; Marine environment; Sustained loading; Autonomous healing; Tidal conditions
资金
- Australian Research Council [DP190102954, DP200101919]
- ARC [DP170104192]
- Sydney Research Accelerator (SOAR) program of The University of Sydney
- Australian Research Council [DP200101919] Funding Source: Australian Research Council
The healing performance of bacteria-based mortar was evaluated under different conditions, with the results showing reduced healing in tidal conditions due to deterioration of healing products under wet-dry cycles.
Healing performance of bacteria-based mortar was evaluated under sustained axial tensile loading at 90% of the cracking load in submerged freshwater, submerged marine and tidal conditions. The bacteria-based mortar contained Halobacillus Halophilus bacteria, calcium lactate and expanded perlite aggregates. Loaded bacterial specimens showed 20%-30% less healing compared to unloaded ones. Crack widening due to creep under sustained loading decreased healing. Healing increased by 5% in bacterial specimens under tidal conditions when the loading level was reduced from 90% to 60%. Compared to control specimens, bacterial specimens enhanced healing by 14% under sustained loading in submerged marine conditions. However, bacteria had no noticeable impact on healing for specimens under sustained load in tidal conditions. Specimens in tidal conditions displayed 14%-25% less healing compared to those under submerged marine conditions. The reduced healing in tidal conditions was the result of deterioration of healing products under wet-dry cycles.
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