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Development Of A Pavement Rutting Model Using Shakedown Theory

Mechanics and Materials Vols. 174-177, pp 726-732. Chen, W.F. (1975). “Limit analysis and soil plasticity”. Elsevier , Amsterdam. Claros, G. and Hudson, W.R. (1992). “Development of an overlay design method for flexible pavements on lateritic soils”. Proceedings of 7 th International Conference of asphalt pavements, Nottingham University, pp 3–53. Collins, I.F. and Boulbibane, M. (2000). “Geotechnical analysis of unbound pavements based on shakedown theory”. J. of Geotechnical and Geoenvironmental Engineering , 126, No., pp 50-59. Collins, I

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Investigation And Design Of Durable Pavement Structure Rehabililation

Abstract

Preservation of the appropriate quality of road assets needs timely rehabilitation of high-level design and construction. Since the actual life cycles of Hungarian road rehabilitation projects are often much lower than expected, research activities of the authors were concentrated on the development of an updated design technology of road pavement rehabilitation using scientifically based algorithms. The paper outlines the elements of a pavement rehabilitation design based on Hungarian and foreign literature survey, detailed own laboratory test series and trial section monitoring. The main steps of the design methodology comprise the Client’s data supply and disposition, site condition evaluation by the designer, deflection measurement in carefully selected points, eventual additional laboratory tests, choosing design subsections, correction of the equivalent thickness of the new asphalt layer, calculation of strain in wearing course. Besides, relationships are presented between various condition parameter data like bearing capacity values, unevenness measuring data and rut depth values. The pavement rehabilitation design technique suggested here – if widely in Hungary – can significantly contribute to attaining a much longer life cycle of rehabilitated roads than by now, and it is (would be) extremely efficient due to the very limited funds available for highway purposes.

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MECHANICAL PERFORMANCE OF BITUMINOUS CONCRETE INCORPORATING STEEL SLAG WITH NATURAL AGGREGATE

ABSTRACT

India has world’s second largest road network in terms of length with a total road length of 4.24 million km. Hot mix bituminous pavement contributes around 50% road length to this vast road network. Large scale highway construction in India, emanating from rapid development, has caused massive depletion of scarce natural aggregate. This paper addresses this problem by investigating the influences of the utilization of steel slag as a coarse aggregate on the properties of hot mix bituminous concrete. Physical characteristics of bituminous mix ingredients i.e natural aggregate, steel slag aggregate and bituminous binder were determined to find out their compliance with Ministry of Road Transport and Highway Specification for Road and Bridge Works in India. Mechanical characteristics of bituminous mixes i.e Unmodified (having natural aggregate) and Modified (having steel slag as coarse aggregate) were determined using Marshall Method of mix design.

Unmodified and Modified mixes were subjected to an array of performance tests to check out the suitability of steel slag aggregates for the preparation of high performance bituminous concrete mix. The performance tests includes, retained Marshall Stability, indirect tensile strength, static creep test, wheel-tracking test and resilient modulus test. The laboratory study confirmed the improvement in various mechanical properties of steel slag modified mixes besides reduction in temperature and moisture susceptibility.

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COMPARISON STUDY BETWEEN LIME APPLICATION METHODS ON HMA ASPHALT CONCRETE IN IRAQ

ABSTRACT

Iraq has been experiencing tremendous development in the national infrastructure road network over the last decade. Iraqi economic growth in rural areas has been triggered by good and safe roads and a good highways network system. Studies have shown that climate, traffic conditions, characteristics of the asphalt binder and the aggregate are the main factors that can contribute to premature pavement failures. The ability of hydrated lime to improve the fatigue and rutting resistance of Hot Mix Asphalt (HMA) as well as moisture sensitivity, has led to observed improvement in the field of lime modified HMA pavements, and significant decreases in maintenance and repair costs of the highway network. In this study, the mechanistic properties of asphalt concrete mixes modified with hydrated lime as a partial replacement for limestone dust mineral filler were evaluated. Four replacement rates were used; 1, 1.5, 2, and 3 percent by weight of aggregate beside two kinds of addition methods, namely dry and wet. Asphalt concrete mixes were prepared at their optimum asphalt content and then tested to evaluate their engineering properties which include moisture damage, resilient modulus, and permanent deformation and fatigue characteristics. These properties have been evaluated using indirect tensile strength, uniaxial repeated loading and repeated flexural beam tests. The experimental results, in general, showed that the mixes modified with hydrated lime were found to have improved fatigue and permanent deformation characteristics, also showing lower moisture susceptibility and higher resilient modulus. The use of 1.5 percent of hydrated lime in the wet addition method as a replacement for limestone dust mineral filler has shown a significant improvement in asphalt concrete behavior and has added to the local knowledge the possibility of producing more durable mixtures with higher resistance to distress.

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Site Trials of Recycled and Secondary Aggregates in Concrete and Concrete Blocks in Qatar

Development Planning (QSDP) (2011). “Qatar National Vision 2030”. Gulf Publishing and Printing Company, Doha. Qatar General Secretariat for Development Planning (QSDP) (2011). “Qatar National Development Strategy 2011-2016 - towards Qatar National Vision 2030”. Gulf Publishing and Printing Company, Doha. Qatar Foundation (2012). Qatar National Research Strategy. Qatar Foundation, Doha, Qatar. Available at http://www.qf-research-division.org/images/QNRS_2012.pdf. QPMC (2013). Personal communication with David Matyus - Technical

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Effect of Aggregate Gradation on the Stiffness of Asphalt Mixtures

REFERENCES BROWN, S. 1978. Material characteristics for analytical pavement design. Developments in highway pavement engineering , 1, 41-92. FULLER, W. & THOMPSON, S. 1907. The laws of proportioning concrete. Trans Am Soc Civil Eng 59:67 . KIM, S., ROQUE, R., GUARIN, A. & BIRGISSON, B. 2006. Identification and Assessment of the Dominant Aggregate Size Range (DASR) of Asphalt Mixture (With Discussion). Journal of the Association of Asphalt Paving Technologists , 75. MIRANDA, B. L. 2012. Gradation-Based Framework for Asphalt Mixtures

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Laboratory Trials Of Cold Recycled Foamed Bitumen Asphalt: Raf Waddington

References `Lanre, O.O., 2010. A study on the development of guidelines for the production of bitumen emulsion stabilised RAPs for roads in the tropics . Ph.D. thesis, University of Nottingham. ADEPT, 2013. Managing reclaimed asphalt - Highways and pavements. An ADEPT Guidance Note. Botasso, H.. et al., 2008. Reciclado de pavimentos asfálticos en frío. Una forma de utilizar totalmente el RAP para el mantenimiento y rehabilitación de la red caminera. Centro de Investigaciones Viales Universidad Tecnológica Nacional - Facultad Regional La Plata

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Comparative Structural Analysis of Flexible Pavements Using Finite Element Method

References Abed, A.H., and Al-Azzawi, A.A. (2012), “Evaluation of Rutting Depth in Flexible Pavements by Using Finite Element Analysis and Local Empirical Model”, American Journal of Engineering and Applied Sciences, Vol. 5, No. 2, pp. 163-169. Asphalt Institute (1982). Research and Development of Asphalt Institute’s Thickness Design Manual. 9th Ed., Research Report 82-2, The Asphalt Institute. Boussinesq, J. (1885), “Application des potentiels á l'étude de l'équilibre et du movement des solidesélastique”, Paris

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Cohesion, Fracture and Bond – Understanding the Data from the Vialit Cohesion Pendulum Test and Other Fracture Tests from an Analysis of Rheological Properties

, 1966, pp. 358-399 Highways Agency, Transport Scotland, The National Assembly for Wales and The Department for Regional Development Northern Ireland “Determination of Cohesion of Bitumen and Bituminous Binders”, Manual of Contract Documents for Highway Works, Volume 1, Clause 957 - Specification for Highway Works, 2008. Pérez-Jiménez, F., Valdés, G.A., Botella, R., Miró, R. and Martínez, A., “Approach to fatigue performance using Fénix test for asphalt mixtures”, Construction and Building Materials, Elsevier, No. 26, 2012, pp. 372

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