1.0.1 This specification is formulated with view to being adapt to the needs of highway industry development and highway construction, improving the design quality and service performance of asphalt pavement and ensuring the safety, reliability and economic rationality of engineering.
1.0.2 This specification is applicable to the asphalt pavement design in highway construction and renovation engineering of all classes.
1.0.3 Structural composition design, material design and thickness design shall be carried out according to the highway class, pavement service performance requirements and the traffic load required to be borne and in combination with local climatic, hydrological, geological, material, construction and curing conditions, the engineering practice experience, environmental protection requirements, etc., and then the design scheme shall be selected through techno-economic analysis.
1.0.4 The subgrade shall meet the minimum rebound modulus requirement, and appropriate dry and wet types shall be available. Comprehensive design of subgrade and pavement shall be carried out on the basis of investigating and mastering the soil quality and dry/wet type of subgrade along the line.
1.0.5 New technology, structure, material and process shall be selected positively and reliably in combination with local conditions and engineering experience.
1.0.6 In addition to complying with the relevant requirements of this specification, the pavement design in such special areas as desert, expansive soil and saline soil shall also take regional particularity into consideration and include corresponding technical measures in combination with local experience and achievements.
1.0.7 In addition to those specified in this specification, the design of asphalt pavement shall also meet the requirements of current relevant national and professional standards.
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2 Terms and Symbols
2.1 Terms
2.1.1 asphalt pavement
pavement with asphalt surface course
2.1.2 reliability
probability of pavement structure completing intended function within the specified period and under the specified conditions. The reliability that the design structure is required to reach is called target reliability
2.1.3 reliability index
value index used for measuring the reliability of pavement structure. The reliability index used as the design basis of pavement structure according to this specification is called target reliability index
2.1.4 design working/service life of pavement
intended working/service life of pavement free from structural repair under normal design, construction, service and maintenance conditions
