The document outlines procedures for developing an asphalt mix design that meets project specifications for long-lasting pavement performance. It describes determining optimal aggregate blends and asphalt contents through testing methods to achieve sufficient mix stability, voids, workability and other properties. Mix types, aggregate gradations and evaluation/adjustment processes are defined to establish a quality management system for mix production and testing.
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ASPHALT_MQC2.ppt
1. GENERAL OBJECTIVE
TO DETERMINE, WITHIN THE LIMITS OF THE
PROJECT SPECS., A COST EFFECTIVE BLEND
AND GRADATION OF AGGREGATES AND
ASPHALT CEMENT THAT WILL GIVE LONG
LASTING PERFORMANCE AS PART OF THE
PAVEMENT STRUCTURE.
2. SPECIFIC OBJECTIVE
TO PRODUCE A MIX HAVING:
Sufficient Asphalt
Sufficient Mix Stability
Sufficient Voids
A Maximum Void Content
A Sufficient Workability
Proper Aggregate Texture and Hardness
3. MIX TYPE SELECTION
Surface Course Mixtures
Binder Course Mixtures
Base Course Mixtures
Sand Asphalt Mixtures
10. PROPORTIONING AGGREGATE & ASPHALT
• Percent by Weight of Total Mixture
• Percent by Weight of Total Dry Aggregate
11. TESTING METHODS
(a) ASPHALT CEMENT
Penetration D 5 T 49
Viscosity
Absolute D 2171 T 202
Kinematic D 2170 T 201
Flash Point D 92 T 48
Thin Film Oven Test D 1754 T 179
Rolling Thin Film
Oven Test D 2872 T 240
Ductility D 113 T 51
Solubility D 2042 T 44
Specific Gravity D 70 T 228
ASTM
Designation
AASHTO
Designation
12. TESTING METHODS
(b) MINERAL AGGREGATES
Los Angeles Abrasion C 131 T 96
or C535
Unit Weight C 29 T 19
Sieve Analysis (Aggregates) C 136 T 27
Sieve Analysis (Filler) D 546 T 37
Specific Gravity (Coarse) C 127 T 85
Specific Gravity (Fine) C 128 T 84
Specific Gravity (Filler) D 854 T 133
or C 188 or T 133
Sulfate Soundness C 88 T 104
Sand Equivalent D 2419 T 176
Particle Shape D4791
ASTM
Designation
AASHTO
Designation
13. TESTING METHODS
(c) HOT MIX ASPHALT
Asphalt Content (Extraction) D 2172 T 164
Asphalt Content (Nuclear) D 4125 T 287
Recovery of Asphalt D 1856 T 170
Density & Voids Analysis
Maximum Specific Gravity of
Paving Mixtures D 2041 T 209
Bulk Specific Gravity D 1188 T 166
or D 2726
ASTM
Designation
AASHTO
Designation
14. PREPARATION OF TEST MIXES
WEIGHING AGGREGATES
FOR BATCH MIXES
HEATING AGGREGATE BATCHES
IN OVEN
15. PREPARATION OF TEST MIXES
ADDING ASPHALT CEMENT
TO HEATED AGGREGATES
MECHANICAL MIXER FOR BATCH MIXING
OF ASPHALT & AGGREGATES
16. ANALYZING AGGREGATE FOR PRELIMINARY
MIX DESIGN
AGGREGATE ANALYSIS FOR JOB MIX FORMULA
17. (1) Dry all aggregates to constant weight at 110 °C
(2) Perform washed sieve analysis and specific gravity test.
(3) Compute a blend of aggregates to produce the desired
mix gradation.
(4) Separate each dried aggregate into fractions
(5) Compute the batch weights of the sized aggregate and
filler required.
(6) Prepare mix design test specimen.
ANALYZING AGGREGATE FOR PRELIMINARY MIX
DESIGN
18. AGGREGATE ANALYSIS FOR JOB MIX FORMULA
(1) Secure representative sample from each stockpile
(2) Dry all aggregates to constant weight
(3) Perform washed sieve analysis & specific gravity test
(4) Compute the blend of aggregates
(5) Adjust the cold feeder controls
(6) Perform a washed sieve analysis on hot bin samples
(7) Compute batch weights of the sized aggregates
(8) Prepare test specimens of the design mix
(9) Adjust plant controls, if necessary
(10)Verify aggregate gradation
19.
20.
21.
22. TERMINOLOGY
(1) Bulk Specific Gravity, Gsb
(2) Apparent Specific Gravity, Gsa
(3) Effective Specific Gravity, Gse
(4) Voids in Mineral Aggregates,
VMA
(5) Effective Asphalt Content, Pbe
(6) Air Voids, Va
(7) Voids Filled w/ Asphalt, VFA
23. PROCEDURE FOR ANALYZING A COMPACTED
PAVING MIXTURE
Measure the bulk specific gravities of the coarse and fine
aggregate
Measure the specific gravity of the asphalt cement and of the
mineral filler
Calculate the bulk specific gravity of the aggregate combination
in the paving mixture
Measure the maximum specific gravity of the loose paving
mixture
Measure the bulk specific gravity of the compacted paving
mixture
24. PROCEDURE FOR ANALYZING A COMPACTED
PAVING MIXTURE
Calculate the effective specific gravity of the aggregate
Calculate the asphalt absorption of the aggregate
Calculate the effective asphalt content of the paving mixture
Calculate the percent voids in the mineral aggregate in the
compacted paving mixture
Calculate the percent air voids in the compacted paving
mixture