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Study on the Application of Granite Asphalt Mixture Overlay on Old Cement Concrete Pavement

Author: YuanBaoSheng
Tutor: PengYuHua
School: Chang'an University
Course: Road and Railway Engineering
Keywords: Granite Asphalt overlay Reflective cracking Finite Element Adhesion test
CLC: U416.2
Type: Master's thesis
Year: 2011
Downloads: 67
Quote: 0
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Abstract

In the Pearl River Delta region, a lot of the early construction of cement concrete pavement pavement due to the proximity of the design life of or caused traffic due to the continued rapid growth of the different degrees of damage and faces Maintenance and engineered. The old road paved asphalt surface is one of the main forms of old cement concrete pavement reconstruction, however, this composite structure of the material differences, the presence of the old road seams easier reflective cracking. At the same time, the continued development of large-scale construction of highways in the region and building materials led along traditional asphalt surface layer with a severe shortage of material (basalt), making the road builders from local materials, reduce the cost of the perspective turned to local the abundant acidic granite stone. Highway Administration of Guangdong Province Science and Technology Project 2007 - \to carry out applied research applied to the old cement concrete pavement asphalt overlay on the surface layer of granite stone, is conducive to widen the road surface layer of stone sources, local materials and reduce material transport distance, reduce the project cost and avoid over-development of the original scarce surface layer material has a great significance. This article is mainly relying on the Canton, Foshan City, Guangdong provincial highway S112 the apricot line Chencun section of the road repair training works. First, by the condition of the road surface damage on the old cement concrete pavement, carrying capacity and other aspects of the investigation, to evaluate the status of the old road, and put forward a reasonable Old Road Pavement Treatment program; then established based on ANSYS software overlay pavement structure three-dimensional finite element model of the stress state of load and temperature in the bottom of the asphalt overlay of the seams to make a comprehensive analysis of the system, reference material selection and design parameters selected for the design of asphalt overlay; then under the old cement concrete pavement the operating characteristics of the asphalt overlay, from raw materials, adhesion test, asphalt mixture gradation design and road carried out with performance and other aspects the overlay material composed of design research; Finally, the test road paving Granite Asphalt Overlay to study the granite in the engineering applications of old cement concrete pavement asphalt overlay surface layer and by the detection of the test road performance to evaluate the effect of its application. The study results show that: (1) the establishment of a three-dimensional finite element model of the pavement structure by using ANSYS calculated using the pavement structure the bottom stress indicators overlay software HPDS2006 both calculated relative error of 3.15%, indicating that using ANSYS finite element program overlay structure stress analysis is relatively reliable; (2) Old Road and overlay paving graded asphalt gravel set geotextile variety of typical anti-counter-measures can effectively delay the occurrence of reflective cracking, 7cm bitumen macadam AM-20 2.5cm thick stress-absorbing layer the effect of a combination of measures, for instance of the pavement structure, end overlay maximum principal stress σ1, the maximum shear stress τmax and stress σc than paved fell by 78.6%, 82.9% and 84.4%; (3) extended mode for reflective crack of asphalt overlay, the overlay drawn based reflective crack control the load shear reflective cracking and temperature spreading structural evaluation process, and instance overlay structure on the evaluation, the evaluation results show that it meets prevent reflective cracking requirements; (4) extend the time the boiled boiled method can more accurately determine the anti-stripping agent to improve the granite and asphalt sticky the attached contribution and evaluated in a certain extent, the thermal stability of the pros and cons of anti-stripping agent, anti-stripping agent is preferred; (5) preferred mixing (?) norlife300 anti-stripping agent, Granite Asphalt Mixture water stability, high temperature stability that significantly improves performance, fully meet the specifications of the hot and humid District asphalt mixture road performance requirements; (6) by taking technical measures to retard reflective cracking and improve the adhesion properties of granite and asphalt, completed using traditional construction techniques granite asphalt overlay pavement compaction, flatness, water seepage performance, skid resistance. The results of this research provide theoretical support and technical guidance for asphalt overlay of cement concrete pavement and asphalt pavement surface layer is made of granite aggregate.

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