بررسي عملكرد خاك ماسه‌اي تقويت شده با بيوپليمر ويناس

چكيده انگليسي :

An investigation into the performance of vinasse biopolymer in sandy soil Samaneh Taheri samaneh taheri@cv iut ac ir 2019 01 19 Department of Civil Engineering Isfahan University of Technology Isfahan 84156 83111 IranDegree M Sc Language FarsiSupervisor Dr M A Rowshanzamir mohamali@cc iut ac irAbstractConventional soil stabilizers such as lime and cement have now proven to cause detrimental impacts onthe environment Thus the usage of natural biopolymers in soils reinforcement seems to be an essentiallyengineered effort On the other hand industrial agriculture wastes propose stability potential ingeotechnical engineering Vinasse biopolymer is a waste material produced from ethanol duringsugarcane processing In this study effectiveness of vinasse to stabilize sand was investigated throughlaboratory tests The treatment of sandy soil by using an environmentally friendly material i e vinassebiopolymer seems to be economical pollution controlling and an appropriate solution of the wastesdisposal The effect of biopolymer content curing time and percentage of soil compaction were studiedby compaction tests direct shear tests and unconfined compressive strength tests The amounts ofbiopolymer used in the experiments ranged from 2 to 6 In a number of samples a small amount ofcement has been added to investigate the stability of samples exposed to moisture Compaction tests havebeen conducted to study the effect of adding biopolymer on the soil density The results of thisexperiment showed that adding the resin to the soil samples may have a typical role of lubrication andfacilitate the soil compaction process Using the vinasse resin up to 6 instead of adding water to soil increases the maximum dry density Also direct shear tests were done to investigate the effect of addingthe vinasse biopolymer on the shear strength and shear strength parameters of the soil samples Variousfactors such as the amount of biopolymer and cement curing time density as well as the effect ofmoisture on the strength of treated and untreated soil samples were also investigated The results of theseexperiments indicate that the soil shear strength has increased steadily by adding the biopolymer up to5 Moreover adding 5 the biopolymer to soil samples cured for 14 days and direct sheared under 100kPa normal stress showed shear strength increment up to 9 5 times and internal friction angle 1 8 times incomparison to that of untreated soil The soil cohesion was also enhanced to the significant value of 476kPa Moreover the test results showed that by adding cement as well as increasing curing time anddensity the soil shear strength increases steadily The amount of 5 vinasse and 0 5 cement were foundto be optimal values for which the soil shear strength increased up to 10 times in 14 day curing timeunder 100 kPa normal stress in comparison to that of untreated soil The effect of moisture on soilsamples showed that shear strength of treated sample was reduced in wet conditions But with subsequentdrying the sample gains its initial shear strength again Therefore the presence of water has a significanteffect on the strength of treated soil samples Coating the surface of the treated soil samples with silanecan make the samples to be waterproof by which the sample strength may be maintained at moistureexposure conditions Making direct shear tests on saturated samples showed that the strength of thetreated samples reduced nearly to that of original untreated soil due to saturation To improve theperformance of the stabilized soil under saturated conditions the efficiency of various additives such asbentonite superabsorbent polymer and water resistant adhesives was investigated It was concluded thatadding a polyester adhesive can maintain the treated sample strength in saturated conditions to some

طاهري، سمانه

بررسي عملكرد خاك ماسه‌اي تقويت شده با بيوپليمر ويناس

اصلاح خاك ماسه بادي , بيوپليمر , رزين ويناس , آزمايش تراكم , آزمايش برش مستقيم , آزمايش مقاومت فشاري تك محوري , آزمايش تصويربرداري الكتروني