Study On Technology Of Old Road Widening And New Connection Structure And Its Application

Expansion of the old road widening project, the binding site of the old and new roadconstruction is often difficult, but also by Li Bo weakness. As old roadbed, primary stability,strength, stiffness, density, degree of consolidation differences in vehicle loads, is bound tocause transverse differential settlement, resulting in damage to pavement cracking. Traditionalapproach is to use the old road side open stairs practices, strengthen the combination of old andnew road, but still semi-rigid direct contact, old and new pavement structure due to the materialproperties are different, the loads caused by inhomogeneous deformation can not be eliminated,the expansion of the road in combination of old and new parts of destruction is inevitable.Macadam stress absorption band phase at the old and new pavement, paving with asphaltgravel, asphalt, gravel Mixture large particle aggregates multiple, asphalt content, porosity, porestructure of this multi-effectively blocking off the old pavement crack propagation path, weakentensile strain and tensile stress to transfer capacity to dissipate and absorb the traffic load andthe resulting changes in ambient temperature and thermal stress load stress, asphalt macadammixture contraction coefficient is small, with a larger plastic deformation ability to fully absorbthe strain energy release joints, seams reduce stress concentration, delaying reflective crackingscaling up speed.