Design method of rigid-flexible composite base course section based on asphalt pavement and application of design method

Abstract

The invention discloses a design method for a rigid-flexible composite base of an asphalt pavement. The design method is to spray grease on the surface of the coarse aggregate in the conventional design method of the semi-rigid base of the asphalt pavement, so that the coarse aggregate and the filler The characteristics of the base layer are flexible, and the bonding force between the coarse aggregate and the filling material is blocked as the source of micro-cracks, so that the base layer pavement reaches the designed elastic modulus threshold. The invention can reduce the thickness of the asphalt surface layer, save a lot of construction funds; greatly extend the service life of the road, reduce the frequency of overhaul and daily maintenance; maintain good road use quality; and greatly reduce the cost of the road life cycle.

Description

technical field [0001] The invention belongs to the design field of road building materials, and in particular relates to a design method of a rigid-flexible composite base road section based on asphalt pavement. Background technique [0002] Asphalt pavement refers to various types of pavement paved with asphalt materials mixed with mineral materials. Asphalt binder improves the ability of paving aggregates to resist road damage from driving and natural factors, making the road smooth, less dusty, impermeable and durable. Therefore, asphalt pavement is the most widely used high-grade pavement in road construction. [0003] The existing asphalt pavement structure consists of cushion course, subbase course and base course from bottom to top in order to have the uppermost surface course. [0004] The surface layer is a structural layer that directly bears the repeated action of the wheel load and the influence of natural factors, and can be composed of 1 to 3 layers. The su...

AI Technical Summary

Problems solved by technology

Its main disadvantages: 1. Reflective cracks; 2. Poor water permeability; 3. Sensitive to heavy loads; 4. No healing ability

[0009] The advantages of the flexible base are no reflective cracks, good water permeability, and insensitivity to heavy loads. The disadvantages are that it is prone to horizontal shifting, network cracks, sinking, and rutting, especially in channelized traffic sections.