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The Performance Improvement of Hot Mix Asphalt and
Enhanced Applicability to Pavement Structure Thickness Design Using
DAMA
(Drain Asphalt Modified Additive)
Jung-hoon, Jin*
* University of Incheon ITS. R.C.
Researcher
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2. Materials
Selection
2.1 Aggregate Material
The main
structural material investigated in this study was granite crushed aggregate of
19mm and 13mm size, and screenings, sand, and filler material was used also. The
basic properties and the result of sieve test are shown in tables 1 and 2.
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2.2 The composition of the
additives
This study used DAMA, a kind of PMA, as an additive to
enhance the quality of the asphalt mixture. DAMA is a minute particle composites
of petroleum thermoplasticity resin(50±%), rubber particles obtained from high
quality worn-out tires(CRM;45±%), and other materials (5±%). The characteristics
of this additive is the easiness of its use in asphalt mixtures by using the
simple method of mixing the thermoplasticity vinyl bag wrapped additive in the
mixer at a regular asphalt concrete plant. When this additive is used in drain
asphalt concrete pavement, it can greatly improve the binding of such pavements
so as to be used in road pavement construction. The rubber particles chipped
from worn-out tires have protective characteristics from ultraviolet rays and
anti-oxidation. These and sound absorption and drainage properties greatly
enhance the durability of porousness pavement so as to be used in high
performance road pavements.
2.3 Asphalt
Binder
The asphalt binder used in domestic asphalt pavement is AP-5
with penetration grading of AC 60-70 and is produced by S company in Korea.
Table 3 shows its physical qualities.
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▒ Table 3 Property of asphalt binder AP-5(AC 60-70)
penetration graded asphalt cement
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2.4 Experimental Hot Mix
Asphalt
This study performed laboratory tests on asphalt mixtures
produced by adding various quantities of DAMA to five kinds of HMA. The mixture
types are shown in table 4.
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▒ Table 4 Type of HMA
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| note) DAMA content is based on its weight percentage of the
mixtures. |
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