5440

5100

كارشناسي ارشد

آب

اصفهان: دانشگاه صنعتي اصفهان، دانشكده عمران

1389

يازده،[82]ص.: مصور،جدول،نمودار

ص.ع.به فارسي و انگليسي

احمدرضا پيشه ور، محمدرضا چمني

امير مهدي حلبيان

3/7/89

داود مستوفي نژاد، حميد هاشم الحسيني

مهندسي عمران

ID5100

به فارسي و انگليسي: قابل رويت در نسخه ديجيتالي

Numerical Modeling of Self Consolidating Concrete SCC Flow Hadi Lashkarbolouk h lashkarbolok@cv iut ac ir 2 May 2010 Department of Civil Engineering Isfahan University of Technology Isfahan 84156 83111 Iran Degree M Sc Language Farsi Supervisors mchamani@cc iut ac ir @cc iut ac ir Abstract To benefit from the full potential of fluid concretes such as Self Compacting Concrete SCC tools for prediction of the form filling of SCC are needed Such tools should take into account the properties of the concrete the shape and size of the structural element the position of rebar and the casting technique The present lack of such tools may lead to selection of highly flowable mixes with tendency to segregate i e mixes without high static and dynamic stability or mixes with limited workability increasing the risk of improper form filling Although substantial progress has been made in the field of fluid concretes we must not forget that the most suitable concrete to cast a given element is a concrete which is just sufficiently fluid to fill the formwork Computational modeling of flow could be used for simulation of e g total form filling and detailed flow behavior as particle migration and formation of granular arches between reinforcement blocking Indeed just as numerical simulations of the loading of concrete structures allow a civil engineer to identify a minimum needed mechanical strength numerical simulation of the casting process could allow the same engineer to specify a minimum workability of the fresh concrete that could ensure the proper filling of a given formwork Progresses in the correlation between mix proportioning and rheological parameters would of course result but moreover the entire approach to mix proportioning could be improved In this study was to try using with meshless particle method simulated moving concrete in L Box experiment The L Box experiment is use for study about workability and blocking of concrete when pass between the reinforcement Considering the concrete moves in this experiment with large deformation and free surface therefore meshless particle method is choose for flow simulation because the ability of such methods in the simulation of free surface flow problems with large deformation tested In this study concrete is considered homogenous and non Newtonian fluid the relationship between shear stress and strain is flow Bingham fluid law Finally after a suitable model for the simulation of concrete flow was prepared then using with method to evaluate the existing concrete and ultimately suggest the diagram With this diagram we can evaluate concrete workability and use in practical application Key Words Self Consolidating Concrete Meshless Particle Method L Box Non Newtonian

احمدرضا پيشه ور، محمدرضا چمني

امير مهدي حلبيان

داود مستوفي نژاد، حميد هاشم الحسيني