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Gradation Composition of the AC-10 Asphalt Concrete of the Thin Overlay and Research of Pavement Performance

Author: LiXiaoSong
Tutor: WuJianMin
School: Chang'an University
Course: Materials Science
Keywords: AC-10 Thin layer overlay Critical sieve Skeleton Crushing value test CA ratio
CLC: U414
Type: Master's thesis
Year: 2009
Downloads: 185
Quote: 3
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Abstract


AC - 10 thin asphalt concrete suitable for the pavement thin layer overlay can effectively reduce the thickness of the overlay , and reduce the impact on the elevation of the pavement after curing . Highway pavement maintenance and has a broad application prospects , but found in practical applications , this type of fine-grained asphalt concrete durability , skid resistance and resistance to high temperature deformation is often a problem , as follows: First , the compactness good resistance to high temperature deformation capacity and skid poor performance ; good skid resistance to rutting , but the porosity big that durability difference . Therefore , how to ensure its road performance under the premise of improving structural depth and resistance to high temperature deformation , ensuring road traffic safety should be in-depth study . Combined application examples at home and abroad , and designed several different gradation AC-10 asphalt mixture . To control the the mixture gradation curve toward the introduction of the Superpave technology of control points and restricted area concept study by Marshall test the critical sieve ( 2.36mm ) the pass rate Marshall indicators ; through new 7.1mm by rate adjusted to obtain the AC-10 asphalt concrete porosity with a 7.1mm sieve test test Method : Using crushing value by changes in rates of distribution law designed five groups graded coarse aggregate of 2.36mm or more , the mixture skeleton research and analysis of the impact of the critical sieve 2.36mm aggregate mix skeleton structure . Regression analysis and functional relationship between the crushing value test results and structural depth ; several important parameters in the AC-10 mix design : the CA ratio , FAc than Whetstone than 7.1mm sieve through rate using the orthogonal experiment designed in 9 groups gradation , the skid resistance of the AC-10 asphalt concrete . The test results show that the confrontation slip performance is CA ratio , followed by the aggregate ratio . Key research through the conclusion of the CA slip performance is better than confrontation . Analyze two important sieve Bailey method formula P D / 2 (4.75mm) and P PCS (2.36mm) against slip performance . The test results show that , by adjusting the 7.1mm pass rate , the reasonable control of CA than the mixing temperature and Whetstone gifted than skid characteristics , resistance to high temperature deformation ability and durability good AC - 10 thin layer overlay .

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