Effect of glass powder added grout for deep mixing of sand

The deep mixing column is one of the soil improvement methods that is extensively used to improve the weak or problematic soils in order to increase the bearing capacity and reduce the settlement applied by creating mixed columns which include in-situ mixing of soil and Portland cement or lime with special machines. The goal of this study was to estimate the possibility of replacing waste glass soda powder with Portland cement in the binder for stabilization of sandy soil using the deep mixing method in order to reduce the consumption of cement. The grounded waste glass soda to a fine powder shows some pozzolanic properties due to the silica content. Three laboratory tests were carried out (Vicat test, unconfined compressive test and Ultrasonic pulse velocity) in order to investigate the effect of the glass powder that replaced with cement in the binder at different proportions (0%, 3%, 6%, 9% by dry weight) has been experimentally investigated for the deep mixing on the performances of loose sand with various clay contents (4%, 8%, 20% by dry weight). It is found from the testing results that i) the glass powder is not able to accelerate the setting time of grout, ii) the bulk density does not significantly change with the glass powder, clay content and curing time, iii) The best value of UCS can be obtained at the 28-days curing time due to the addition 3% of glass powder at the 20% clay content of sand, iv) the elastic modulus correlates well with the UCS values (R ≥ 83) at the majority of soilcrete samples and v) the best UPV can be obtained at the 28-days curing time due to the addition 3%of glass powder at the 4% clay content of sand.