Abstract
This paper deals with load-deflection behavior the jointed plain concrete pavement system using steel dowel bars as a mechanism to transmit load across the expansion joints. Experimentally, four models of the jointed plain concrete pavement system were made, each model consists of two slabs of plain concrete that connected together across expansion by two dowel bars and the concrete slab were supported by the subgrade soil. Two variables were dealt with, the first is diameter of dowel bar (12, 16 and 20 mm) and the second is type of the subgrade soil, two types of soil were used which classified according to the (AASHTO): Type I (A-6) and type II (A-7-6). Experimental results showed that increasing dowel bar diameter from 12 mm to 20 mm has a little effect on load-deflection behavior of the tested specimens with only 5% increase in failure load. This may be attributed to that the failure (caused by flexural crack) depends mainly on concrete strength. Results also showed that decreasing CBR value of subgrade soil from 7% to 5% decreases failure load by about 33%.
Highlights
A rigid pavement system consists of a number of concrete slabs
Increasing dowel bar diameter reduces bearing stresses between bar and concrete, diameter has a very little effect on failure loads with only 5% increase when dowel bar diameter increases from 12mm to 16 mm or 20 mm because the failure of the tested specimens was highly dependent on concrete strength as discussed in the previous section
The results show that using Type II (CBR=5%) gives lower failure load than type of soil (Type I) (CBR=7%) by 33%, this implies the importance of subgrade support resistance on concrete pavements performance
Summary
A rigid pavement system consists of a number of concrete slabs. In the rigid pavement system, joints installed to supply space to accommodate horizontal movement of slab due to moisture and temperature change, and to control cracks. The pavement system requires a device of load transfer like tie bars or dowel bars. A jointed plain concrete pavement system exposed to the following loading cases: self-weight of the slab, wheel loads of vehicle and loads due to thermal effects of environmental due to temperature and moisture changes which causes crack of the concrete slab, load transfer devices failure like dowel bars, and loss of slab support because of temperature create curling, opening and closing joints [4]
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