Development Of New Film Thickness Models For Hot Mix Asphalt

A Review on Using Crumb Rubber in Reinforcement of Asphalt

The use of crumb rubber in the reinforcement of asphalt is considered as a smart solution for sustainable development by reusing waste materials, and it is believed that crumb rubber modifier (CRM) could be an alternative polymer material in improving hot mix asphalt performance properties.

When is a Tack Coat Necessary? - Cornell Local Roads Program

Normally, when a new layer of hot-mix or coldmix asphalt is placed, the surface of every rock and grain of sand is uniformly coated with a film of asphalt. The initial film thickness is only a couple thousandths of an inch thick. Over time, sunlight hardens the surface films and makes the asphalt less sticky.


SPR-1521 - Development of Simple Performance Tests Using Laboratory Test Procedures to Illustrate the Effects of Moisture Damage on Hot Mix Asphalt ; SPR-1522 - Development of Acceptance Criteria of Compacted Hot Mixture Asphalt Bulk Specific Gravity Based on Vacuum Sealed Specimens

Performance-Based Pay Factors for Asphalt Concrete

Performance-Based Pay Factors for Asphalt Concrete Construction: Comparison with a Currently Used Experience-Based Approach Authors: L. Popescu and C. L. Monismith Work Conducted Under “Development of New Asphalt Concrete QC/QA Pay Factor Tables” as part of Partnered Pavement Research Center Strategic Plan Element No. 3.1.5 PREPARED FOR:

Deliverable N5 - Correction - Study of water effects on

development of multi model mean maps were referenced to identify anticipated climate changes. With regards to moisture damage in asphalt pavements, the following maps were selected for further analysis: • Change in annual precipitation, • Change in number of freeze-thaw cycles, and • Change in annual maximum temperature.


(a) AS 2150 “Hot mix asphalt - A guide to good practice”; and (b) AGPT04B/07 Austroads “Guide to Pavement Technology Part 4B: Asphalt”. 1.3.5 Requirements for Technical Procedures Details of calculation for insitu air voids and thickness are shown in Annexure R116/E. 1.3.6 Testing Procedures

How Much Does Hot Mix Asphalt Cost?

How much does hot mix asphalt cost? On average, the price of the asphalt is between and 0 per ton for just the materials. The cost varies depending on the current price of oil. This Washington State Department of Transportation highway construction guide, for instance, said the average bid price in western Washington was .01 per ton.

Georgia DOT Asphalt Pavement Selection Guidelines

Hot Mix Asphalt Up to 800 Group I, Group II, or Blend Any group or blend Hot Mix Asphalt 800 to 4000 Blend or Group II Either Group II or blend of Groups I and II. The Group I fraction should not exceed 60% by weight of the total aggregate nor more than 50% of the coarse aggregate. Hot Mix Asphalt 4000 and above Group II only 100% Group II only

Section 6: Approved Pavement Design Methods

Surface Test Type A for Concrete and Hot-Mix Asphalt Surfaces ♦ 5. Surface Test Type B for Concrete and Hot-Mix Asphalt Surfaces ♦ 6. Considerations for Improving Ride Quality ♦ 7. Analysis of Ride Data 12. Premature Distress Investigations 1. Overview ♦ 1.1 Introduction ♦ 1.2 Technical Assistance 2. Investigation Team ♦ 2.1 ...

Bonded concrete overlay of asphalt mechanical-empirical

Bonded concrete overlays of asphalt pavements (BCOAs) are becoming a common rehabilitation technique used for distressed hot mix asphalt (HMA) roadways. The original design procedures were based primarily on data from instrumented pavements and finite element modelling.

Arizona Pavements and Materials Conference

film thickness on the surface of the aggregates. In order to carry ... Design Methods for Asphalt Concrete and Other Hot-Mix ... research and development of asphalt technology, including volumetric mix design procedures. Today AAPT continues as a leader in the advancement of asphalt …

Modeling of Hot-Mix Asphalt Compaction: A Thermodynamics

The model was developed within a thermodynamic framework that was capable of demonstrating the nonlinear dissipative response associated with the asphalt mix. This work should lead to further development of simulation models capable of capturing the mechanics of the compaction processes both in the laboratory and in the field.

Notes to specification for open graded porous asphalt TNZ P/11

mixes is important, and is primarily a function of connected voids and the binder film thickness. Though open graded porous asphalt material is designed to have a high proportion of inter-connected voids, it also has a low total aggregate surface area, and hence a substantial binder film thickness is possible as an aid to promoting reasonable

tandf: Road Materials and Pavement Design: Table of Contents

Forensic approach to predict film thickness of reacted and activated rubber (RARX) modified asphalt mixtures ... A new paradigm to explain the development of instability rutting in asphalt pavements. ... Effect of liquid silane-based anti-stripping additives on rheological properties of asphalt binder and hot mix asphalt moisture sensitivity.


ASPHALT MIX DESIGN 1 INTRODUCTION These notes provide an outline of the process of asphalt mix design and are substantially based on text from the Austroads Asphalt Guide. A detailed guide to selection and design of asphalt mixes for Australian conditions is provided in APRG Guide to Pavement TechnologyPart 4B, Hot mix asphalt - A guide to good ...

Analytical Formulas for Film Thickness in Compacted Asphalt

Recently, several researchers have proposed asphalt film thickness as a criterion for ensuring the durability of asphalt mixtures. However, they suggested that the standard film thickness equation, which dates back to the 1940s, needs to be examined by modern technology and improved.

Determination of Binder Film Thickness for Bituminous

finer than the thickness of the asphalt film blends with asphalt cement binder to form a mortar or mastic that contributes to improved stiffening of the mix. In the present study the film thickness was determined by Hveem method by determining the total surface area and the effect of fillers thereon is discussed.


The purpose of this paper is to present a new, rational and effective model for estimating the modulus of asphalt concrete using binder modulus and volumetric composition. The model is based upon an existing version of the law of mixtures, called the Hirsch model, which combines series and parallel elements of phases.


Asphalt Film Thickness (AFT) = 8.2 microns Adjusted AFT = 8.4 microns Guideline notes based on Bituminous Office Consultation * Use Combined Mix Aggregate for Gsb *Surface Area (SA) Calculates to Tenth ex. (27.8)


Evolvement of asphalt rubber technology will be discussed as a continuance regarding the development of hot mix asphalt materials, particularly as the concept of asphalt rubber binder and the open graded friction course was conceived, tested and implemented. ... This mix type has much higher binder film thickness which results in increased ...

Asphalt Pavement Association Of Michigan Selecting the RightMix

Asphalt Pavement Association Of Michigan Selecting the Right Mix Local Agency Programs HMA Selection Guidelines Mixture Type Marshall Mixture Superpave Mixture 36A 13A 2C 3C 4C 3E_ 4E_ 5E_ Min. #/syd 110 165 350 220 165 330 220 165 Max. #/syd 165 275 500 330 275 410 275 220 Note: Application Rate of 110#/syd. Per 1 inch Thickness

Improving the precision of test methods used in VMA

@inproceedings{Krugler1992ImprovingTP, title={Improving the precision of test methods used in VMA determination}, author={P E Krugler and Maghsoud Tahmoressi and David A. Rand}, year={1992} } With the goal of increasing the service life of asphalt pavements, the TxDOT task force for revising asphalt ...


DESIGN AND CHARACTERIZATION OF ASPHALT MIXTURES BASED ON PARTICLE PACKING AND MECHANICAL MODELING ABSTRACT By Huanan Yu, PhD Washington State University August 2012 Chair: Shihui Shen Existing asphalt mixture design approaches …


necessary to complete the construction of hot mix asphalt concrete pavement consisting of one or more courses on a previously prepared base, seal coat of asphalt cement and cover aggregate, and bituminous surface treatment in single or multiple courses.

Improved Hirsch Model for Estimating the Modulus of Hot-Mix

This paper presents an improved version of the Hirsch model for estimating the modulus of hot-mix asphalt (HMA) from asphalt binder modulus and mixture composition.

Layer Coefficients for New and Reprocessed Asphaltic Mixes

A list of layer coefficients is proposed for pavement design. The results of the asphalt materials did not show that there are significant differences in resilient modulus of asphalt mixtures tested; thus, layer coefficients for the asphalt mixtures, derived : based on the resilient modulus, are similar for all asphalt mixtures.

Numerical analysis of asphalt mixture and comparison with

8/1/2014 · Free Online Library: Numerical analysis of asphalt mixture and comparison with physical Marshall test.(Report) by "Journal of Civil Engineering and Management"; Engineering and manufacturing Air pollution Models Asphalt Properties Bituminous materials Usage

Durability of Hot Asphalt Mixtures Containing Reclaimed

tions ranging between 5 and 50% for production of new hot mix asphalt (HMA) mixtures % e- [15]. Recent r searches [8] [11] [16] [17] have established that RAP replacement at proportions above 50% is feasible to pro-duce new HMA mixtures, obtaining satisfactory results in the mechanical properties. Likewise, the susceptibility

TPF – 5(153) Optimal Timing of Preventive Maintenance for

Film Thickness Development of new film thickness models for hot mix asphalt Michael Heitzman 2005 dissertation Iowa State University, Ames, Iowa New Approaches for Computing Film Thickness Michael Heitzman Iowa Department of Transportation 2006 AAPT …

Dependence of the recycled asphalt mixture physical and

6/1/2011 · 1. Introduction Hot mix asphalt (HMA) (called "asphalt" outside the United States) is typically a mixture of approx 5% liquid asphalt binder (i.e., asphalt cement, called, "bitumen" outside the United States) and 95% solid aggregate (e.g., crushed stone, gravel, sand, or reclaimed asphalt pavement).


Investigation of In-Place Asphalt Film Thickness and Performance of Minnesota Hot Mix Asphalt Mixtures ... Calibration of the 2002 AASHTO Pavement Design Guide for Minnesota Portland Cement Concrete Pavements and Hot Mix Asphalt Pavements (2004) Evaluation of Interface Modeling in FEDFAA ... Development of Simple Asphalt Test for Determination ...


and design of hot-mix asphalt surfacings for roads. At present, hot-mix asphalt is used extensively for bases and surfacings for new construction, as well as for overlays in the maintenance and rehabilitation of existing pavements. All in all, about two million tons of hot-mix asphalt are used annually in South Africa. This wide

Materials | Free Full-Text | Microstructural Analysis and

The use of RAS in hot mix asphalt has seen increased acceptance from government agencies and construction contractors in the U.S. only in recent years. The main obstacle is the potentially detrimental effect of the aged oxidized binder present in old roofing shingles.

Related Posts