Impact of calcium content and pH value on MICP crack healing of geopolymer concrete

• DOI: 10.1016/j.cemconcomp.2023.105410
• Publication Date: 2023-12-23T16:47:01Z
• Authors: Yiming Zhou; Mohamed Elchalakani; Liang Cheng; Mohamed A. Shahin
• Keywords: Geopolymer cement

In recent years, microbial-induced carbonate precipitation (MICP) is becoming a popular method of soil stabilisation and concrete crack healing. MICP, calcium necessary reactant, pH value crucial factor for living bacteria. Both parameters (i.e., pH) are adjustable geopolymer mix design. Given the attractive potential future applications concrete, understanding impact content MICP healing in design great importance. this study, it was found that high helpful to improve effect. When CaO% increases from 7.5 % 18.3 %, degree increases. Na2O% 4.4 11.6 improved by around 1, also depends on way implemented. case where bacteria were applied outside surface cracks, effect almost negligible. However, when used internal healing, lower beneficial provide more suitable environment bacterial activity thus generate products. Therefore, adjustment can enhance effectiveness concrete.