Development of “push-pull” injection mechanism for microbially-induced calcite precipitation in sand.

Microbially induced calcite precipitation (MICP) using s.pasteurii demonstrates high plausibility. This research aimed to develop a lab-based “push-pull” injection system which improves treated soil’s homogeneity. Different injection methods and spacing had been studied using the “push-pull” mechanism on 444 mm x 278 mm x 150 mm sized samples. Effluents were collected for pH and ammonium content analyses. Surface strength, surface calcite contents and core unconfined compressive strength were determined after curing. One directional alternating diagonally injection method yielded the most homogenous strength sample without valley. Sample exhibits more than 4 MPa surface strength and 0.59 MPa core unconfined compressive strength.