Asphalt Mixtures
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Transcript of Asphalt Mixtures
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Asphalt MixturesBy: Braden Watson
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Introduction
What my company does.My experience with asphaltMy goals
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History of asphaltAsphalt occurs naturally in both lakes and in rock asphalt.
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History of AsphaltFirst recorded as a road building material around 625 BC in Babylon.Comes from the Greek word “asphaltos” meaning secure.Used by the Greeks and the Romans.Sir Walter Raleigh
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First Asphalt RoadwaysTurnpikes in ScotlandAsphalt comes to America
Mainly used for sidewalks and crosswalks.
Roads started to be paved in the late 1860sEdmund J. DeSmedt laid the first asphalt road.
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Paving in AmericaIn 1896, New York City adopted asphalt paving.
New York required a 15 year warranty.
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Original PatentsThe first patent on Hot Mix Asphalt (HMA) was in 1871 by Nathan B. Abbott of Brooklyn, New York.Limited Technological growth.Original patents expired in 1920.
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Changing TechniquesUntil 1900 almost all asphalt came form Trinidad Lake.Refined Petroleum Asphalts
Originally used as an additive.
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Paving Operations
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My ProjectI created an asphalt mix design for Asphalt Materials.I worked with
Asphalt Materials Inc. (Producer)Star Paving (Contractor)CMT Engineering (Designer/Quality Control)
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My Project Time:
Design time: 50 hoursQuality Control: 20+ hours
Materials used:Sinclair 64-22 binderAMI AggregatesCMT’s asphalt laboratory
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Marshall Mix Design6 basic steps:
Aggregate selectionAsphalt binder selectionSample PreparationStability determinationDensity and VoidsOptimum asphalt binder calculations
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Aggregate SelectionDetermine aggregate physical properties:
Toughness and abrasionDurability and soundnessCleanlinessShape and surface textureGradation and size
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Aggregate Blending
Must meet the specification for the job.Typical specifications require a certain percentage be retained on a particular sieve size by weight.
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Asphalt Binder Evaluation
The Marshall mix design does not have a specific asphalt binder.Each entity has its own specification for binder usage:
UDOT 58-22UDOT 58-28APWA 64-22 (Also same as UDOT)
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Optimum Asphalt Binder Content
This is specified in the mix design specifications by UDOT, APWA, or other city entities.
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Sample PreparationSeveral trial aggregate-asphalt binder blends are created.Usually 5 different blends, 3 samples of eachSamples are prepared in 0.5 percent by weight increments.
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Marshall CompactionAutomatic and manual versionsSpecified number of blows.Specifications for the machine.
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Stability and FlowPerformance prediction measure.Measures the maximum load.Measure the specimens plastic flow as a result of the loading.
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Density and Voids
Bulk specific gravityFinds the maximum density of the asphalt.
The specific gravity is used to calculate the Air Voids and the Voids in the Mineral Aggregate.
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This is what you don’t want!
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Stability: Recommended Oil Content:Flow: Virgin Oil Content:Air Voids: Lottman (TSR):VMA Oil Supplier/Grade:Anti-Strip: Bulk Unit Weight:
Max. Density (Rice): No. of Blows:
(inch) (mm)1 25
3/4" 191/2" 12.53/8" 9.5#4 4.75#8 2.36#16 1.18#30 0.6#50 0.3#100 0.15#200 0.075
33 28-4253
24
3-77.012
11-2318
60-8076
100
None 143.4
Job Mix Formula
88.4
Specification
94
100100100
100100
75
5.294900
RECOMMENDED DESIGN CRITERIA6.14
144.0
Sinclair PG 64-22
Percent Passing
15.2
2.389
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ConclusionI have learned the basics of asphalt mix designs.My design was used on a couple of projects:
Wal-Mart on 10400 South and Bangerter Hwy.2 Walgreens
I have developed good relationships with everyone involved.Good technical understanding of asphalt.
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Questions?