TA274 : Development a method for expansion and shrinkage control in Continuously Reinforced Concrete Pavement (CRCP)
Thesis > Central Library of Shahrood University > Civil & Architectural Engineering > MSc > 2016
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Abstarct: The principal concept of this study is to develop one of the restraining methods of Continuously Reinforced Concrete Pavement (CRCP) end movement. One of the problems in concrete pavement is existence of transverse joints at the end of concrete slabs. On of this joints are expansion joints that construct for allowing longitiudinal movement. Transverse joints cause many problems in concrete pavements like slab edge breaking, load transfer problem in dowel bar, joint sealing failure and etc. So, trying to be done decrease of joint number and width. Joints number problem can be solved using CRCP, but to considering much length of CRCP, end movement under the influence of temperature is much still, and should be considered wider expansion joints. So in this study make an effort for decrease of CRCP end movement and subsequently decrease of joints width.
Effective parameters in reduce of CRCP end movement are friction between concrete slab-sublaxyer and reinforcing of concerete. But to concidering much length of CRCP, mentioned items not much impact in longitiudinal movement control. So that, should other methods be used to control concrete pavement movement. These methods are Expansion Joint (EJ), Wide Flang Beam (WF) and Anchor Lug (AL) systems. The first two methods allow slab movement, but AL method restrains and controls pavement movement. According to the aim of study in controlling of end movemen, AL systeme is desirable.
AL systeme consist of anchor lug elements that construct steadily on a pavement. This elements exist inside of the sublaxyer. During temperature changing, anchor lugs tend to move longitiudinally as concrete slab, but sublaxyer mass reaction force prevents from this movement.
In the past details of lugs was offered baxsed on field experience. In this study by using finite element analysis, analyze AL systeme details and offered good design (baxsed on minimum longitiudinal movement) for this restraining systeme in CRCP. baxsed on analysis results, restraining systeme is good if one of the lugs placed in the end of slab and other lug placed in the nearest place to first lug (considering technical conditions). Also wall height of lugs should be about 0.5 to 1 meter. For decreasing much tension occurred in slab between end lugs, should be increased slab thickness in this place. Considering this assumption, slab and lugs reinforcement details was suggested. Studying compressive strength of sublaxyer and slab uplift value shows lime stabilized soils have bad conditions in compressive tension, but slab uplift value is not critical.
Keywords:
#Continuously Reinforced Concrete Pavement (CRCP) #concrete pavement #concrete pavement end movement control #anchor lug #ABAQUS #thermal loading #finite element method Link
Keeping place: Central Library of Shahrood University
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Keeping place: Central Library of Shahrood University
Visitor: