Mechanism Study on Synergistic Effect of Microorganisms and Magnesium Oxide on Cementing Drill Cuttings
Microbial-induced calcium carbonate precipitation(MICP)is a new reinforcement and remedia-tion method for contaminated soil,which also provides a new direction to cement drill cuttings.Based on the analysis of the cemented body of highly active magnesium oxide gel material,an in-depth study on syn-ergistic cementation for drill cuttings by microorganisms and magnesium oxide was conducted,and a new treatment methods for drill cuttings was presented.The speciemens cemented by microorganisms combined with magenesium oxide were tested with FTIRs,XRDs and SEMs,and the results indicated that rosette hydro-magnesite(4MgCO3·Mg(OH)2·4H2O)and acicular nesquehonite(MgCO3·3H2O)were yielded in synergy of microorganism and magnesium oxide.The loose particles were cemented into the well-structured cemented body by the dense carbonate network which was the cementitious mechanism of the synergistic effect of microorganism and magnesium oxide.The analysis of the factors affecting the strength of the cured body showed that the development trend of the strength of the cured body was positively correlated with mi-crobial concentrations,active magnesium oxide concentrations,and curing times,and negatively correlated with the water content and the urea concentration.
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