Prevention and Control Measures of Asphalt Pavement Cracks

In view of the above analysis of the reasons for the asphalt pavement disease, mainly from the construction materials, design, construction, maintenance and traffic management and other five aspects to take appropriate preventive measures. Through the pavement structure design and thickness calculation can meet the asphalt pavement strength and carrying capacity requirements, the basic solution to the problem of load-type cracks. For how to avoid or reduce the generation of non-load-type cracks, from the design and construction of two aspects to be considered.

(1) material aspects
Reasonable to determine the asphalt pavement structure, asphalt surface cracks mainly by the asphalt surface itself caused by low temperature contraction. Selection of low temperature stiffness, large ductility, poor temperature sensitivity, low wax content of high-quality asphalt, selected ore material, accurate gradation with asphalt surface of the mineral and reasonable configuration of asphalt mixture ratio. Preparation of excellent performance of the asphalt mixture, control the amount of asphalt to ensure that the performance of asphalt mixture is excellent, can effectively reduce the cracks.
(2) design aspects
In the semi-rigid pavement design, in the stability to meet the requirements of the premise, the preferred use of the larger pitch asphalt asphalt layer. Asphalt surface with dense asphalt concrete. Adopt the appropriate thickness of the asphalt layer to ensure that the semi-rigid base during the use of generally do not produce dry shrinkage cracks and temperature cracks. Carefully designed, the geological terrain complex geological survey work. Pay special attention to reinforce the foundation, prevent uneven settlement due to weak foundation, fill the roadbed with qualified packing, or fill the subgrade with the filler to ensure that the roadbed has sufficient strength and stability to ensure that the road has a stable Foundation: the use of anti-erosion performance, dry shrinkage coefficient and the temperature coefficient of small and high tensile strength of semi-rigid materials to do the grassroots: the use of high-quality asphalt asphalt layer; in the stability to meet the requirements of the premise, The larger bitumen is made of asphalt.
(3) construction aspects
Careful construction, selection of advanced construction technology and machinery and equipment, to develop a sound construction program to ensure compliance to meet the specifications, in strict accordance with the design requirements of soft foundation treatment to improve the quality of soft foundation treatment, strict control semi-rigid grass construction The moisture content of the mixture can not exceed the optimum moisture content required for compaction or the control is within the allowable range of the construction specification; after the semi-rigid base has been rolled. Should be timely health, to prevent the occurrence of cracks reflected to the surface layer, to protect the moisture content of the mixture from loss; after the end of health, should immediately spray through the layer of oil, and paving asphalt layer as soon as possible.
(4) conservation aspects
Strict maintenance and management, to strengthen the road cleaning, to ensure good drainage performance. Timely scientific treatment of cracks, to avoid further expansion of the disease.
(5) to strengthen traffic management
Strengthen the traffic management, limit the passage of large overload vehicles; in the summer continuous high temperature period, the operation and management units can be heavy vehicles arranged at night, the morning road table temperature lower period through: prohibit the nail tires on the road over-wear or more severe restrictions use.