AbstractIn this study, the effects of cement, fly ash and super plasticizer, improver materials by adding into the grout, on soil-binder mixing columns called as deep mixing columns (DMC) are investigated. Fly ash is a waste product emerging from burning in the thermal power plant. By evaluating waste materials in this way, environmental pollution will be reduced directly and cement usage and carbon emissions caused by cement production will be reduced indirectly. By using super plasticizer into the grout, less porous and permeable elements with more structural strength will be manufactured. In order to achieve these goals, an experimental program was developed using statistical and experimental design methods. It is desired to determine the optimum grout quantity and consistency required to maximize the strength of the column manufactured with DMM in silty soils and silty sands. For this purpose, the amounts of fly ash (0-40%), cement (3-11%), super plasticizer additive (0.5-2%) and water/binder percentage (0.5-1.25%) were chosen as variables to form grouting material. Experimental studies have been carried out using Taguchi method, which is a powerful optimization technique, using 5-parameter and 4-level L16 design table. Undrained-unconsolidated triaxial test specimens were prepared in PVC tubes with diameter of 47 mm and length of 100 mm for each design for curing time of 28 days. As a result of the experiments, deviator stress of the soil-binder mixture was found for each design.
Farouk A, Shahien MM. Ground improvement using soil– cement columns: Experimental investigation. Alexandria Engineering Journal 2013; 52: 733-740. https://doi.org/10.1016/j.aej.2013.08.009
Pye N, O’Brien A, Essler R, Adams D. Deep dry soil mixing to stabilize a live railway embankment across thrandeston bog. Grouting and Deep Mixing 2012; 2012: 543-553. https://doi.org/10.1061/9780784412350.0040
Lorenzo GA, Bergado DT. Fundamental characteristics of cement-admixed clay in deep mixing. J Mater Civ Eng 2006; 18(2): 161-174. https://doi.org/10.1061/(ASCE)0899-1561(2006)18:2(161)
Horpibulsuk S, Miura N, Nagaraj TS. Clay–water/cement ratio ıdentity for cement admixed soft clays. J Geotech Geoenviron Eng 2005; 131(2): 187-192. https://doi.org/10.1061/(ASCE)1090-0241(2005)131:2(187)
Deng Y, Yue X, Liu S, Chen Y, Zhang D. Hydraulic conductivity of cement-stabilized marine clay with metakaolin and its correlation with pore size distribution. Engineering Geology 2015; 193: 146-152. https://doi.org/10.1016/j.enggeo.2015.04.018
Pakbaz MS, Farzi M. Comparison of the effect of mixing methods (dry vs. wet) on mechanical and hydraulic properties of treated soil with cement or lime. Applied Clay Science 2015; 105-106: 156-169. https://doi.org/10.1016/j.clay.2014.11.040
Kang G, Tsuchida T, Kim Y. Strength and stiffness of cement-treated marine dredged clay at various curing stages. Construction and Building Materials 2017; 132: 71-84. https://doi.org/10.1016/j.conbuildmat.2016.11.124
Madhyannapu RS, Puppala AJ, Nazarian S, Yuan D. Quality assessment and quality control of deep soil mixing construction for stabilizing expansive subsoils. J Geotech Geoenviron Eng 2010; 136(1): 119-128. https://doi.org/10.1061/(ASCE)GT.1943-5606.0000188
Kitazume M, Grisolia M, Leder E, Marzano IP, Correia AAS, Oliveira PJV, Åhnberg H, Andersson M. Applicability of molding procedures in laboratory mix tests for quality control and assurance of the deep mixing method. Soils and Foundations 2015; 55(4): 761-777. https://doi.org/10.1016/j.sandf.2015.06.009
Shrestha R. Soil Mixing: A Study on ‘Brusselian Sand’ Mixed with Slag Cement Binder, Master Dissertation, University of Ghent 2008.