The effect of oxygen and water on the provision of crack closure in bacteria-based self-healing cementitious composites

Tan, Linzhen; Reeksting, Bianca; Justo-Reinoso, Ismael; Ferrándiz-Mas, Verónica; Heath, Andrew; Gebhard, Susanne; Paine, Kevin

doi:10.1016/j.cemconcomp.2023.105201

Cited by 11 publications

(1 citation statement)

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“…Environmental Impact: As we continue to innovate, future research should evaluate the potential environmental impact of using polypeptides in sand solidification. This encompasses the effects on the consolidated sand itself and potential ramifications for surrounding ecosystems and water sources [49]. By integrating these considerations, we ensure that our scientific advances align with our commitment to environmental sustainability.…”

Section: Long-term Effects and Durabilitymentioning

confidence: 97%

Polypeptide additives for improving the performance of microbially induced calcite precipitation (MICP) sand consolidation

Wang,

Chen,

Song

et al. 2023

Preprint

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Recognizing the limitations of Microbially Induced Calcite Precipitation (MICP) for sand consolidation, particularly the insufficient mechanical strength and the uneven distribution of precipitated calcite, our research takes an innovative approach. For the first time, we compare the potential of various polypeptide additives, including polylysine, polyaspartic acid, and polyglutamic acid, to enhance the MICP process. The optimal polypeptide was determined as polylysine, which could increase sand samples’ unconfined compressive strength (UCS) by 35.03% after MICP treatment. The optimal polylysine concentration is 100 mg/L, and the cementing liquid cost increased by only 3%. When the polylysine concentration exceeded 100 mg/L, the UCS of sand-solidified samples decreased. Environmental scanning electron microscope (ESEM) images showed that calcium carbonate and sand were bonded more tightly with polylysine added, and the distribution of calcium carbonate was uniform in the sand samples treated by MICP. X-ray diffractometer (XRD) showed calcium carbonate’s crystal form is calcite. This research signifies a crucial step forward in optimizing MICP for sand consolidation, potentially transforming applications in construction, geotechnical engineering, and environmental remediation.

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Section: Long-term Effects and Durabilitymentioning

confidence: 97%