How does one prevent pavement blow ups, and what can be done about them once they occur?
Blow ups (also known as buckling or tenting) are caused by upward buckling of pavement on both sides of a joint. They occur during hot weather where joint widths are insufficient to accommodate expansion, either because joints are spaced too far apart or because they have become filled with gravel or other incompressible material. (Blow ups may also occur at cracks.) They can be prevented by providing contraction joints at intervals of about 15 or 20 feet and keeping the joints sealed with an effective sealant that rejects stones. When a blown-up pavement is to be repaired the damaged section must be removed, replaced with new concrete, and provided with a good, functioning sealed joint.