Compaction Temperature Hot Mix Asphalt

Why Tracking Temperatures is Key to Successful Asphalt …

Aug 16, 2011 · Why Tracking Temperatures is Key to Successful Asphalt Paving. Ambient (air) temperatures, base (aggregate and existing asphalt) temperatures and hot mixed asphalt temperatures are critical to obtaining compaction and longevity of the newly paved surfaces and patches. Hot mixed asphalt is manufactured at temperatures between 270°F and 325°F.

Compacting Hot-Mix Asphalt Pavements: Part I | Roads & …

Dec 28, 2000 · more time for compaction. As the temperature of the mix coming out from under the paver screed increases, the time available for compaction also increases. A mix placed at a temperature of 300 F, for a given lift thickness and other environmental factors, will take longer to cool to the cutoff temperature of 175 F, than will the same mix placed at a temperature of 250 F.

Laboratory Mixing and Compaction Temperatures for …

• Recommended laboratory mixing and compaction temperature ranges for Marshall mix design based on viscosity (Saybolt Furol) as early as 1962. – Changed to absolute and kinematic viscosity in 1974 – 170 ± 20 centistokes for mixing – 280 ± 30 centistokes for compaction.

Laboratory Mixing and Compaction Temperatures for …

Project Mixing and Compaction Temperatures • Project-level mixing and compaction temperatures – Mixing temperature • can best be defined as the temperature at which the aggregate can be sufficiently and uniformly coated. • As with the lab temperatures, the mixing temperature should not exceed 177°C (350°F). – Compaction temperature

Mixing and Compaction Temperatures of Asphalt Binders in ...

Chapter: Chapter 1 - Background. It was stated that prior experience has shown that a mixing temperature in the range of 160 °C to 171 °C (320 °F to 340 °F) and a compaction temperature in the range of 143 °C to 155 °C (290 °F to 310 °F) are adequate for most mixes with polymer- …

Mixing and Compaction Temperatures of Asphalt Binders in ...

Mixing and Compaction Temperatures of Asphalt Binders in Hot-Mix Asphalt (2010) These tests, termed (1) the phase angle method and (2) the steady shear flow viscosity (SSFV) method, provide reasonable, consistent mixing and compaction temperatures that correlate well with the results of HMA coating, workability,...

Compaction of Hot Mix Asphalt Concrete

Hot mix asphalt is composed of asphalt, mineral aggregate and air. Compaction is the process by which the asphalt and aggregate are compressed into a reduced volume. For HMAC this process is achieved by rolling the upper surface of each layer of the asphalt

Hot-Mix Asphalt Laydown and Compaction

mix to a windrow on the roadway in front of the paver. The windrow can be formed in one of two ways. First, a spreader box or windrow sizer can be used. In this case, the mix is deposited into the box and is uniformly metered out onto the roadway as the truck moves for­ …

Asphalt Pavement Construction - Asphalt InstituteAsphalt ...

Mix temperature is dependent on the grade of asphalt used in the mix: Less viscous asphalt requires lower temperatures, while more viscous asphalt requiers higher temperatures. At the start of a mix design, target temperatures are specified for proper mixing and compaction.

FHWA Hot Mix Asphalt Pavement Guidelines

Because the contractor is responsible for compacting the pavement, then the contractor should have the authority to dictate factors such as mix temperature (165 °C …

How to Compact Asphalt Pavements - For Construction Pros

May 09, 2016 · Asphalt mixtures cool quickly so it’s important to compact while the mix is hot. Typically, asphalt comes out of the plant at about 300° F. At that temperature, it is relatively soft and...

Modeling of Hot-Mix Asphalt Compaction: A …

Compaction is the process of reducing the volume of hot-mix asphalt (HMA) by the application of external forces. As a result of compaction, the volume of air voids decreases, aggregate interlock increases, and interparticle friction increases.

Compaction - Pavement Interactive

Compaction Measurement and Reporting

Technical Report Documentation Page 1. Report No. 2 ...

compaction temperatures for hot mix asphalt design and construction with modified asphalt binders. It was found that application of the shear rate concept rather than the traditional approach used for unmodified binders can reduce the mixing and compaction temperatures between roughly 14 to 38 C for the former and 10 to 27 C for

Compacting Hot-Mix Asphalt Pavements: Part II | Roads ...

Dec 28, 2000 · asphalt compaction. In the August issue, Scherocman, a consulting engineer in pavement design and construction located in Cincinnati, discussed the importance of compaction and the relationship between density and the air-void content of hot-mix asphalt (HMA) pavement. For an HMA to perform well under

WARM MIX ASPHALT INVESTIGATION

temperature of conventional Hot Mix Asphalt (HMA). By reducing the viscosity of bitumen and/or increasing the workability of mixture, some WMA technologies can reduce the temperature to 100 o C and even lower without compromising the performance of asphalt.

Hot Mix Asphalt with Intelligent Compaction | Caltrans

Intelligent Compaction rollers are used in compaction of hot mix asphalt for breakdown and intermediate compaction for method compaction process and for density required HMA. The current nssp 39-8 requires use of steel drum vibratory roller equipped with GPS, temperature sensor, accelerometer data acquisition system and displays.

Warm Mix Asphalt - Purdue Engineering

Warm Mix Asphalt APA and Hamburg results were similar for HMA and EVOTHERM granite / PG 64-22 mixes 0.00 5.00 10.00 15.00 20.00 25.00 300F 265F 230F 190F Compaction Temperature Rut Dept h, mm APA Rutting Depths Hamburg 0 2 4 6 8 10 12 m m @ 10K c y c l es HMA EVOTHERM Tested at 40oC Tested at 50oC wet

Warm Mix Asphalt - EAPA

Hot Mix Asphalt  is produced and mixed at temperatures roughly between 120 and 190 °C The production temperatures of Hot Mix Asphalt depend on the bitumen used. The lower mixing and paving temperatures, obtained by the use of Warm Mix Asphalt, minimise fume and odour emissions and creates cooler working conditions for the asphalt workers.

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Factors affecting asphalt compaction | Asphalt magazine

The temperature at which an asphalt mix is produced affects both the ease of compaction and the time available for compaction. The time available for compaction increases with mix temperature, but there are limits as to how high the production temperature can be in order to avoid damaging the asphalt …

Determining Lab Mixing and Compaction Temperatures for ...

conduct testing using one of the two procedures recommended by NCHRP Report 648, Mixing and Compaction Temperatures of Asphalt Binders in Hot‐Mix Asphalt – the DSR Phase Angle or DSR Steady Shear Flow – and determine the appropriate temperatures from that testing and analysis.

Hot Mix Asphalt | Asphalt Calculator | Calculate Aggregate ...

Hot mix asphalt (HMA) pavement refers to the bound layers of a flexible pavement structure. Asphalt pavement material is a precisely engineered product composed of about 95 percent stone, sand, and gravel by weight, and about 5 percent asphalt cement, a petroleum product. Asphalt cement acts as the glue to hold the pavement together.

SUBJECT: HOT MIX ASPHALT (HMA) MIXTURE DESIGN …

Materials Method 5.16 describes New York State Department of Transportation’s (NYSDOT) requirements and policies for the development of Hot Mix Asphalt (HMA) mixture designs, including the responsibilities of the Producer and the Department.

How do I determine the mix and compaction temperature?

When I performing Marshall mix design method and using midified binder to determine the compaction and mixing temperature, it got unreasoable temperature which was carried on Brookfield test.

Compaction temperatures of Sasobit produced warm mix ...

Oct 01, 2016 · In this study, comprehensive asphalt tests were carried out to get the optimum Sasobit content. The Marshall compaction tests of warm-mix and hot-mix SBS modified mixtures at various temperatures were performed with two methods.

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Feeling the heat | Asphalt magazine

To retain its compaction properties between the asphalt plant and being laid on the road, the asphalt mix cannot be too hot or too cold. Its temperature has to be just right. “Temperature is the key,” said Jim Scherocman, a Cincinnati-based asphalt consultant with 54 years experience in the business.

Development of a Simple Method for Determining …

A SIMPLE METHOD FOR DETERMINING MIXING AND COMPACTION TEMPERATURES FOR HOT-MIX ASPHALT Recommendations from NCHRP 9-39 Randy West Director National Center for Asphalt Technology John Casola Product Sales Manager Malvern Instruments

Mixing and Compaction Temperatures of Asphalt Binders …

TRB’s National Cooperative Highway Research Program (NCHRP) Report 648: Mixing and Compaction Temperatures of Asphalt Binders in Hot-Mix Asphalt explores enhanced test methods for determining laboratory mixing and compaction temperatures of modified and unmodified asphalt binders.

MIXING AND COMPACTION TEMPERATURES FOR HOT MIX ASPHALT ...

MIXING AND COMPACTION TEMPERATURES FOR HOT MIX ASPHALT CONCRETE According to Superpave mixture design, gyratory specimens are mixed and compacted at equiviscous binder temperatures corresponding to viscosities of 0.17 and 0.28 Pa*s, respectively.

Authors: Yetkin Yildirim · M Solaimanian · T W KennedyAbout: Viscosity · Shear rate · Asphalt · Compaction

Hot Mix Asphalt

Hot Mix Asphalt Hot mix asphalt (HMA) is known by many different names, such as hot mix, asphalt , asphalt or blacktop. It is a combination of stone, sand or gravel bound together by asphalt cement, a product of crude oil. It is mixed at a high temperature, laid and compacted.

MIXING AND COMPACTION TEMPERATURES FOR HOT MIX ...

established, the compaction temperature and the mixing temperature are found to be in the range of 140 qC to 145 qC and 152 qC to 158 qC, respectively. While this method works well for unmodified asphalt binders, it can lead to very high mixing and compaction temperatures for modified asphalt binders.

METHODOLOGY FOR DETERMINING MOST SUITABLE …

METHODOLOGY FOR DETERMINING MOST SUITABLE COMPACTION TEMPERATURES FOR HOT MIX ASPHALT Hassan Youness Ahmed Assistance Prof., Civil Engineering Department, Faculty of Engineering, Assiut University, Assiut, Egypt (Received August 6, 2007 Accepted August 28, 2007) Using an in-correct compaction temperature of hot-mix asphalt has caused

Development of a Simple Method for Determining …

A SIMPLE METHOD FOR DETERMINING MIXING AND COMPACTION TEMPERATURES FOR HOT-MIX ASPHALT Recommendations from NCHRP 9-39 Randy West Director National Center for Asphalt Technology John Casola Product Sales Manager Malvern Instruments

(PDF) The Compaction Characteristics of Hot Mixed Asphalt ...

The warm-mix asphalt (WMA) refers to technologies that allow a significant reduction of mixing and compaction temperatures of asphalt mixes through lowering the viscosity of asphalt binders.

What is the temperature of asphalt at the time of lying ...

Depending on the environmental conditions and the distance from the hot mix plant to the project, hot mix asphalt can lose between5°F and25°F. The temperature of the mix on the base after it has passed through the lay down machine – not the mix or manufacturing temperature – is the most important factor in determining the available time for compaction.

HOT MIX ASPHALT PAVEMENT DESIGN GUIDE

HOT MIX ASPHALT WHAT IS HOT MIX ASPHALT? Hot mix asphalt may be referred to by several names. In different sections of the state it may also be referred to as bituminous ,hot plant mix,asphalt , blacktop or Superpave. Hot mix asphalt is composed of aggregate bound together into a solid mass by asphalt cement. The aggregates total

ASPHALT COMPACTION

When joint density is the main objective of the compaction process, the first pass made by the initial phase compactor should be made with both drums on the hot mat about 15-20 cm (6-8") away from the joint. By keeping the drums slightly away from the hot / cold joint, asphalt mix is pushed toward the vertical joint face.

How to Asphalt Roller Patterns Achieve Density and Production

Sep 28, 2010 · When it comes to laydown and compaction, predictions on productivity are less certain. Especially for compaction, the variables of how much HMA is produced and when it is delivered influence the temperature of the asphalt when compacted. Mix temperature is …

Warm Mix Asphalt (WMA) Guide Specification for …

Warm Mix Asphalt (WMA) Guide Specification for Highway Construction Division 400 - Asphalt Pavements and Surface Treatments SECTION 4XX - WARM MIX ASPHALT (WMA) PAVEMENT Warm mix asphalt (WMA) is the generic term used to describe the reduction in production, paving, and compaction temperatures achieved through the application of one of several ...

Consideration of Hot-Mix Asphalt Thermal Properties …

In asphalt binders, viscosity changes with temperature. Research has shown a 1,000-fold increase in asphalt viscosity as the temperature drops from 135 to 57oC. There was also a ten-fold increase in resistance to compaction as mix temperature dropped from 135 to 63oC, due entirely to an increase in binder viscosity [2].

Authors: Bruce A Chadbourn · J A Luoma · David E Newcomb · Vaughan R VollerAffiliation: University of MinnesotaAbout: Finite difference · Thermal diffusivity · Thermal conductivity · Compaction · Asphalt co…

Warm Mix Asphalt - Home

Warm-mix asphalt technologies allow the producers of asphalt pavement material to lower the temperatures at which the material is mixed and placed on the road. Reductions of 50° to 100° Fahrenheit have been documented.

STANDARD PRACTICE FOR MIXTURE CONDITIONING …

1. Place the mixture in a pan, and spread the mixture to an even thickness ranging between 1 to 2 in. (25 and 50 mm) 2. Place the mixture and pan in a forced-draft oven for 2 h ± 5 minutes at a temperature equal to the mixture's compaction temperature ± 5°F (± 3°C).

Assessment of Compaction Temperatures on Hot Mix Asphalt ...

[3] Shiva kumar.m.j, (2009), effect of varying mixing & compaction temperature on marshall properties of bituminous mix, rasta - center for road technology, bangalore. [4] Asphalt institute manual series no 2 (ms-2) (1996) mix design method for asphalt and other hot mix types, lexington.

How To Determine Mix Cooling Time - Asphalt Pavement

National Asphalt Pavement Association. How To Determine Mix Cooling Time MultiCool is a user-friendly application that calculates the rate of cooling in an HMA mat during construction.

CONSTRUCTION SPECIFICATION FOR HOT MIX …

Hot Mix Asphalt Padding means an HMA layer used for correcting crossfall and profile deficiencies in the existing pavement before placing the levelling, binder, or surface course. Hot Mix Asphalt Patching means an HMA surface course placed over localized areas of distressed pavement, generally for the purpose of improving strength, rideability, or safety.

Tender Mixes - Pavement Interactive

Some asphalt cements have light ends that may vaporize and be driven from the mix at about 150 – 175 ° C (300 – 350 ° F). These light ends will have much the same effect as moisture at high temperatures on compaction of the mix. Excess asphalt binder content.

MIXING and COMPACTION RECOMMENDATIONS for …

To date, the quantification of workability has primarily been through the asphalt mixture’s resistance to compaction and hand work in the field. Traditionally, the asphalt binder viscosity has been used to determine mixing and compaction temperatures of hot mix asphalt (McLeod,

4 Tips to Achieve Optimal Asphalt Compaction | World of ...

Operators only have a limited amount of time to get the best density from your asphalt mix. Smoothness of the road is directly impacted by the compaction efforts. Here are a few practical tips to help your paving crew achieve both density and production: Keep an Eye on Your Mix Temperature; To reach optimal compaction, you need to hit the ...

34553-03 Design Guide - pa-asphalt

HOT-MIX ASPHALT (HMA) WHAT IS HMA? Hot-mix asphalt (HMA) may be referred to by several names. In different sections of the state it may also be referred to as bituminous , hot plant mix, asphalt , blacktop or SUPERPAVE. HMA is composed of aggregate bound together into a solid mass by asphalt cement. The aggregates total

Hot Mix Asphalts 101 - New Jersey

Asphalt Rubber Applications • Asphalt rubber is the process of adding recycled, crumb rubber to hot mix asphalt (called dry process) or the asphalt binder (called wet process) to modify the final mixture • Difficult to use in dense-graded mixtures due to residual crumb rubber • Best used in gap-graded type mixtures (SMA and OGFC)

EFFECTS OF RE-HEATING AND COMPACTION …

EFFECTS OF RE-HEATING AND COMPACTION TEMPERATURE ON HOT MIX ASPHALT VOLUMETRICS Michael H. Huner and E.R. Brown INTRODUCTION In the hot mix asphalt (HMA) construction industry, the need for accurate, consistent volumetric measurements has recently become more important. Since more states are relying on volumetric

Assessment of Compaction Temperatures on Hot Mix …

impression on hot mix asphalt properties. From the discovered high correlation value (R2 over 0.9) in the drawn figures, we can realize that there is a strong relation between various parameters of Marshall Samples and compaction temperature. So, observing the compaction temperature during the

Published in: Journal of Civil and Environmental Engineering · 2012Authors: Houman Saedi

Factors Affecting Compaction of Asphalt Pavements

While the Asphalt Institute recommendations for mixing temperature at a viscosity of 0.170 ± 20 Pa-s and a compaction temperature at a viscosity of 0.280 ± 30 Pa-s worked well in laboratory for neat binders, it is well recognized that they result in excessive temperatures for modified binders.

Asphalt QMS - 2016

Asphalt QMS - 2016 iii Section 10: Roadway Inspection and Testing of Asphalt Pavements Page No. Subsection Change 10-6 10.1.7 Replaced +15 °F to -25 °F with ±±±± 25° F (mix temperature …

Welcome to ROSA P | Mixing and Compaction Temperatures …

A research study was undertaken to determine the shear rate during compaction so that the effect of this parameter could be included during viscosity measurements. The use of practical shear rate results in reasonable mixing and compaction temperatures for hot mix asphalt design and construction with modified asphalt binders.

National Center for Effects of Re-heating and …

Asphalt Technology at AUBURN UNIVERSITY Effects of Re-heating and Compaction Temperature on Hot-Mix Asphalt Volumetrics RESEARCH SYNOPSIS–NCAT REPORT 01-04 Problem Statement In the hot-mix asphalt (HMA) construction industry, the air void content (Va), voids in mineral aggregate (VMA) and voids filled with

Project Organization, Mix Design, and Quality Control

Project Organization, Mix Design, and Quality Control . ... Introduction PURPOSE AND ORGANIZATION OF HANDBOOK The purpose of this Hot-Mix Asphalt Paving Handbook is to describe the production and placement of asphalt mixtures from a practical point of view. The handbook ... mix temperature. Lower mixing temperatures are used