DING L T, ZHANG K X, ZHANG M Y, et al． Study on mix proportion design of ultra-thin overlay mixture based on GB5 theory［J］. Journal of Henan Polytechnic University( Natural Science)， doi: 10.16186/j.cnki.1673-9787. （ 2024030008）..

doi: 10.16186/j.cnki.1673-9787. （ 2024030008）..

Received： 2024-03-04

Revised： 2024-08-07

Online： 2026-06-04

Study on mix proportion design of ultra-thin overlay mixture based on GB5 theory (Online)

DING Longting1, ZHANG Kaixing2, ZHANG Mengyuan1, SHEN Quanjun1, WANG Xuancang3, ZHOU Bo3

1. Innovation Research Institute, Shandong Hi-speed Group Co., Ltd, Jinan 250001, Shandong, China; 2. Zhong Gong Gao Ke Maintenance Technology Co., Ltd, Beijing 100095, China; 3. School of Highway, Chang'an University, Xi 'an 710064, Shaanxi, China

Abstract: Objective As one of the most popular preventive maintenance of road surface, the ultra-thin overlay with good durability and surface function could provide better conditions for the safe and smooth running of vehicles. In order to solve the problems of compaction and poor durability of ultra-thin surface, a new gradation design method was proposed for the gradation design of ultra-thin coating mixture. Methods Based on the aggregate extrusion theory, the design method of GB5 ultra-thin surface gradation was proposed through the three-line equation theory , and the design process flow chart of the mixture grading was obtained. The rationality of gradation was verified by the Bayley method, and the compactness, road performance and surface functional durability of the mixture were compared and verified with the traditional mix ratio design mixture. Results The results show that, compared with the traditional graded asphalt mixture, the compaction energy index (CEI) of asphalt mixture with GB5 design grading is reduced by 41.6%, and the compaction rate (K) is slightly larger. By combining CEI and K, it can be concluded that the asphalt mixture with GB5 design grade is easier to be compactified. Under the GB5 design method, the high and low temperature performance of the mixture is greatly improved, the high temperature stability is increased by 10.6%, the low temperature failure strain is increased by 19.6%, the stiffness modulus is reduced by 23.7%, the residual stability and the freeze-thaw splitting strength are increased by 3.9% and 3.7% respectively, and the water stability is slightly improved. For the surface functional durability of the mixture, after 30 000 wear times, the mass loss rate of the traditional grade GB5 design grade mixture is about 4.4% higher, and the structure depth of different wear times is lower than that of the GB5 design grade mixture, and the GB5 design grade asphalt mixture has better surface functional durability. Conclusions The research results provide a new idea for the gradation design of ultra-thin finish and have important guiding significance for the research of ultra-thin finish.

Key words: road engineering；ultra-thin surface；GB5 theory；gradation design； road performance；surface function