Expressway crack repair process and cost analysis are described below.
First, crack repair technology and method
Many crack repair method is generally determined based on the width and depth of the repair process cracks. According to cracks crack width will be divided into four types:
(1) micro-cracks, such cracks slit width <5 mm, edge chipping or cracks only slightly cracked, with no or a small amount of branch joints for smooth vehicle impact is not too large;
(2) small cracks, such cracks width 5 ~ 15mm, a slight crack edge chipping, and a small amount of support joints, cracks on both sides with a little dislocation, it will cause the vehicle slightly beat;
(3) cracks, such cracks slit width of 15 ~ 25 mm, crack edge with moderate fragmentation, and a small amount of support joints, cracks on both sides of a small amount of dislocation, it will cause the vehicle significantly beat;
(4) large cracks, such cracks slit width> 25mm, edge crack severe fragmentation, and have more support joints, cracks on both sides have a greater dislocation, it will cause severe beating vehicle.
1, non-slotted repair method (traditional repair method)
Non-slotted repair method suitable for microfracture repair, depending on the material used, this repair method can be divided into hot fill and cold fill two kinds.
These traditional methods after years of production practice has proved that both the use of heavy traffic asphalt or modified asphalt emulsion pouring, with the surface temperature and grassroots contraction, no more than one year, the cracks repaired again in the original pouring position re-cracking, which accounted for more than 86% failure rate, the second year had to re-patching. Such regular maintenance not only increases the maintenance costs and frequent maintenance work will cause inconvenience and unsafe driving.
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