6201

5798

كارشناسي ارشد

مكانيك ماشين هاي كشاورزي

اصفهان: دانشگاه صنعتي اصفهان، دانشكده كشاورزي

1390

سيزده،78ص.: مصور،جدول،نمودار

ص.ع.به فارسي و انگليسي

علي اسحق بيگي

محمدرضا مصدقي، چهانگير عابدي كوپائي

15/6/90

امين ا... معصومي، حسين خادمي

مهندسي كشاورزي

ID5798

به فارسي و انگليسي: قابل رويت در نسخه ديجيتالي

Effect of Natural Zeolite on Some Physical and Mechanical Properties of Soil Sanaz Kamran Samani Sanaz kamran@gmail com April 6 2011 Department of Agriculture Machinery Engineering Isfahan University of Technology 84156 83111 IranDegree M Sc Language FarsiSupervisors esehaghbeyghi@cc iut ac irAbstractNowadays soil compaction has become a significant subject of study due to agriculturalmechanization It is necessary to find methods for avoiding adverse effects of soil compaction Theeffect of using organic material and natural or artificial modifiers on soil behavior has been studied byscientist In the present study the effect of using natural zeolite Clinoptilolite on soil physical andmechanical properties was investigated At the first part the combinations of two soil textures clayloam and loam two moisture content level 0 9 PL and 1 1PL as a fraction of plastic limit PL andfour levels of zeolite 0 2 4 and 6 db were used to determine shear strength parameters cohesionand angle of internal friction bulk density and water retention curve parameters n r and s ofrepacked soil samples First the soil samples were poured into a metal cylinder and were loaded by anaxial load of 180 kPa for 30 min by CBR apparatus Then small core samples were taken out of thislarge soil volume for determination of soil properties To determine shear parameters a straight sheartest was used and to determine retention curve parameters at four suctions 5 10 30 and 40 kPa aSand Kaolin box was used High suctions 100 200 500 and 1000 kPa was measured by pressureplate apparatus The dry bulk density was also determined by taking a additional core In the secondpart the combined effects of soil texture clay loam and loam and four levels of zeolite 0 2 4 and6 db on maximum dry bulk density and corresponding critical moisture content were quantifiedusing Proctor compaction test with 5 blows per layer The compaction tests were done at differentmoisture contents which were determined according to the consistency limits The shear box resultsshowed that soil cohesion decreased and angle of internal friction increased with zeolite addition Soilcohesion decreased 9 by using of 6 natural zeolite and the angle of friction increased by 13 Clayloam soil with 1 1PL moisture content had more cohesion and the angle of friction was less Loamysoil with 0 9PL moisture content had low cohesion and high angle of friction Dry bulk densitydecreased 4 1 by using of 6 natural zeolite Loamy soil had more dry bulk density than clay loam With increasing soil moisture content from 0 9PL to 1 1PL the dry bulk density increased by 10 Thesoil water retention curve parameters were affected by soil texture moisture content and zeolitetreatments With increasing soil moisture content n r and s decreased Clay loam soil had more ranalogues to loamy soil The r increased 33 8 by using of 6 natural zeolite Results of the secondphase showed that critical moisture content increased 6 6 by using of 6 natural zeolite Dry bulkdensity decreased with increasing natural zeolite but its variation was not significant Loamy soil hadmore dry bulk density and low critical moisture content analogues to clay loam Overall it isconcluded that zeolite could effectively change the soil physical and mechanical properties and themagnitudes of the changes depend on soil and moisture conditions Keywords Clinoptilolite Compaction Shear strength Water retention curve Maximum dry bulkdensity Critical moisture content

علي اسحق بيگي

محمدرضا مصدقي، چهانگير عابدي كوپائي

امين ا... معصومي، حسين خادمي