Research On The Sealants To Be Used To Fill Cracks And Repair Potholes In Asphalt Roads

Cracks and potholes are the two key diseases in asphalt roads. Crack filling and pothole repair are the two most commonly seen and difficulty work for the department of the maintenance. Too much manpower and material resources will be used by traditional method which can not ensure the good sealing performance. It is very desirable to develop crack filling and pothole repair materials for road maintaining and repairing, which can repair the road quickly and anytime.This thesis focused study on two modified sealants, which had excellent performances, such as repairing at any time, fast-repairing, convenient and good quality.As to repair potholes, a new way of prefabricating asphalt-concrete is convenient and not confined to seasons. In order to seal the joints between asphalt-concrete and edges, a new polysulfide sealant modified by epoxy resin was studied. The primary problems of poor-adhesive force and slow-curing at low temperature were solved. The results indicated that, the sealant prepared with liquid polysulfide rubber which was modified by epoxy resin at high temperature has a good adhesive capacity, and the performance of fast-curing at low temperature was realized by adding the appropriate amounts of the catalyst to the vulcanizator.As to fill cracks, a new modified emulsified asphalt which used SBS and epoxy emulsion as modifiers was studied in this thesis. The primary problems of flowing at high temperature, bursting at low temperature, low-earlystrength and poor-adhesive force were solved. The results indicated that the time of earlystrength was shortened, and the softening point, adhesive strength, tensile strength and flexibility at low temperature were enhanced by addition of epoxy emulsion. SBS/EP modified asphalt emulsion has excellent performances, such as high-earlystrength, fast-curing, good adhesive strength and high and low temperature resistance.Finally, the above two sealants prepared were applied in asphalt roads project. The maintenance procedures in relation to cracks and potholes were studied. Being open to traffic through one year, the results revealed that the sealants worked very well.