Simultaneous Biocementation and Compaction of a Soil to Avoid the Breakage of Cementitious Structures during the Execution of Earthwork Constructions

This research focuses on the potential for microbial treatment to stabilize compacted soils, which are often utilized in earthwork projects. A silt–clay sand was used describe a particular kind of soil. The suggested remedy makes use soil’s naturally occurring urea and Ca2+, as well microorganisms introduced compaction water. Two alternative initial water-content types were examined: those dry side close ideal Proctor conditions. Bacillaceae induce CaCO3 precipitation improve hydraulic mechanical properties samples biotreated immediately compacted, so that calcium carbonate during curing process took place contact areas between particles (biocementation) pore space (bioclogging). set techniques study ageing effects, such water-retention curve by dew-points psychrometer, mercury porosimetry intrusion, permeability, ultrasonic pulse velocity, resonant column, unconfined tensile-compression tests. During ageing, it observed bacterial activity consumed water hydrolysis other intermediate reactions precipitate CaCO3. resulted retraction microstructure change macrostructure. bioclogging phenomenon more evident soil microstructure, while biocementation easier observe suction’s effects stiffness studied detail, significant increase detected. Despite these losses, caused stiffening increasing suction, still feasible identify gradual rise small-strain throughout incubation. tests showed similar progressive terms peak compressive splitting strength These results interest when microbiological treatments applied soils produce cementitious materials, with present investigation demonstrating complete their geotechnical behaviour.