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Asphalt Mixing Plant (Factors Affecting Quality (Compaction (Factors…
Asphalt Mixing Plant
Asphalt Quality
Quality Management Process
Plant Trial Mix
The laboratory optimum mix are manufacture at asphalt plant in
large quantity
Mix parameters are verified
(>= 20 tan production)
Void in total mix
Void in mineral aggregate
Bitumen content
Void fill + bitumen
Aggregate grading
Flow
Stablity
Trial Paving
3) Establish required compaction effort
(number of rolling)
4) Establish production mix parameters
2) Test the properties of field samples
5) Tolerance for acceptance control
1) Access constructability of mix
(workability)
Laboratory Mix Design
The process of selecting & proportioning of
binder
,
aggregate
&
filler
Mix design procedure in order to find
final optimum mix
Void in mineral aggregate
Void fill + bitumen
Void in total mix
Flow
Bitumen content
Stablity
Factors Affecting Quality
Temperature Control
To Avoid:
-Difficulty in achieving density
-Water permeability
-Aging of binder
Segregation
To Avoid:
-Variability in Mix Composition
-Finer Fraction higher Binder Content
-Variation in Density & Void
-Worse with Large Aggregate
Compaction
Factors Affecting:
-Material Properties
-Environmental Variables
-Site Condition
-Types of Compaction Equipment
Best Practice:
-Equipment Selection
-Sequences of Compaction
-Rolling Patterns & Speed
-Correct Roller Operations
-Timing From Batching to Paving
-Avoid Over-Compaction
Types
-Drum mix
-Batch plant
-Continuous plant
Batch plant
2) Passes through a
dryer (heated+dried)
3) Passes through a
screening unit
which separate into different size & deposit into bins
1) Aggregate is removed from stockpile
4) Combined aggregate is dumped into a
pugmill
+ asphalt
5) The material is send to a silo
(100 tan/hr)
Continuous plant
2) Uses a
continuous flow
of aggregates into
pugmill
3) In the
pugmill
,
bitumen
is
sprayed continuously
1) The process is
similar with batch plant up to the hot bins
but
differ during mixing
4) Continuous mixing process
Drum mix
2) The mix send into a
hot conveyor
which carries the mix to
surge silo
or
storage tank
3) Production rate
300 ton/hr
1) In the drum aggregate is
dried, heated & mixed with bitumen