7223

6729

كارشناسي ارشد

سازه هاي آبي

اصفهان: دانشگاه صنعتي اصفهان، دانشكده كشاورزي

1391

شانزده، 113ص.: مصور، جدول، نمودار

ص.ع. به فارسي و انگليسي

جهانگير عابدي كوپائي، فرهاد موسوي

كياچهربهفرنيا

15/8/91

سعيد اسلاميان، احمد ميره اي

1396/09/20

كتابنامه

كشاورزي

مهندسي كشاورزي

ID6729

به فارسي و انگليسي: قابل رويت در نسخه ديجيتالي

AbstractConcrete is one of the common materials in hydraulic structures On the other hand due to growingenvironmental concerns and the need to conserve energy and resources efforts have been made to useagricultural by products as a supplementary cementing material The application of agricultural wastes such asrice husk ash in concrete has been reported for many years One of the agricultural wastes is pine cones A largeamount of pine cones around the pine trees are available each year In most cases they are burned which maypossess adverse environmental impacts In this study Pine Cone Ash PCA was prepared after 4 hours burningat a temperature between 550 to 600 C in a furnace Cements in concrete samples were partly replaced by PCAin levels of 10 20 and 30 mass One of the important qualitative factors of concrete is its resistance againstbad weather conditions and destructive alkaline and acidic environments Substitution of waste materials willconserve diminishing resources and will avoid the environmental and ecological damages caused by quarryingand exploitation of the raw materials for making cement To some extent it will help to solve the problemotherwise encountered in disposing of the wastes Partial replacement of clinker or portland cement by slag flyash silica fume pozzolans and natural rock minerals illustrates these aspects These sort of materials requirelittle or no processing expenses In recent years nanotechnology has improved the characteristics of differentmaterials The single factor in emerging nanotechnology is high of nano materials area to volume Increased areato volume ratio result in higher effect of atoms located in surface of particles than those within volume Thisfeature increases nano particles reactions more intensely In this research the use of pine cone ash PCA and itsnano particles as cementation material have investigated Also the mechanical properties such as compressivestrength tensile strength and durability in water and in water containing magnesium sulfate have been measured The cement were replaced with PCA and NPCA containing about 5 of nono paticles NPCA in levels of 10 20 and 30 percent of weighted mass Optimum percent of was 20 The highest compressive strength tensilestrength and durability against magnesium sulfate are obtained in this percent At the age of 180 days samplescontained 20 PCA and NPCA increased their compressive strength about 118 8 and 139 51 percent respectively At the age of 180 days sample contained 20 PCA and NPCA increased their tensile strengthabout 142 1 and 127 18 percent respectively At the age of 180 days sample with 20 PCA and NPCAincreased compressive strength 127 8 and 162 37 percent respectively in magnesium sulfate medium Theweight loss of control samples in magnesium sulfate were 1 35 times more than samples contained 20 PCAand NPCA Destruction of surface of NPCA samples in magnesium sulfate were less than the control samples Inrespect to obtained results from present research pine cone ash and its nano particles can be considered as anappropriate method to effective exclusion of this agriculture additive in concrete industry In general pine coneash showed potentially as an appropriate method to utilize in concrete industry Keywords Pine cone ash PCA Nano Particles of Pine cone Ash NPCA Compressivestrength Tensile strength Concrete Durability

جهانگير عابدي كوپائي، فرهاد موسوي

كياچهربهفرنيا

سعيد اسلاميان، احمد ميره اي