| 1. Application |
| |
applied for asphalt mixture in normal
temperature. |
2. Summary |
| |
All pavements are under external pressure which causes
gradual deterioration. All pavements deteriorate graudally due to external
pressure. This calls for additional costly repair operation. External pressures
can arise from various minor factors such as the change in temperature, size of
traffic, weather, and internal stucture of pavements. Pavement deterioration can
make various forms such as cracks, erosions, etc. All the above problems arise
due to pavement deterioration. In metropolitan areas, pavement deterioration
arise from the laying of water-pipes underground, which is the also the main
cause for road reconstruction. The more city expands, the more frequent is the
construction of underground facilities such as water pipes. Thus, this calls for
more emergency construction measures for hazards such as sudden road oxidation,
asphalt bleeding, and road aggregation. Therefore, with the hot mixed asphalt
for normal temperature pavement, the following problems of the present Hot
Asphalt Mixed Concrete could be continuously and economically enhanced. To be
more specific, various problems such construction temperature limits, road
deterioration, lack of internal pressure support, and minor emergency road
relief cost(equipment, personnel cost, traffic congestion, safety measures for
car accident prevention). . |
3. Materials |
| |
1)Coarse aggregate: in accordance with KSF 23457
2)Fine aggregate: in
accordance with KSF 2358
3)Asphalt materials: in accordance with KSF 2201
and KSM 2208 |
4. Aggregate's quality
|
| |
1)standard value of aggregate |
| |
|
content |
standard value |
|
gravity of KSF2503
absorbtion (%) KSF2503
reduction of
abrasion (%) KSF2508
safety (%) KSF2507
weight of unit (kg/㎥) KSF2503
|
2.45over
3.50below
35.00below
12.00below
1.40over | |
| |
2)Composition and mix ratio of asphalt mixture for normal
temperature |
| |
|
Coarse aggregate(10m/m) |
Fine aggregate(5m/m) |
|
a radius(m/m) |
permeable percentage(%) |
a radius(m/m) |
permeable percentage(%) |
|
10
6
2.38
1.19 |
100
90 - 100
20 - 45
4 - 15 |
10
6
4.76
2.36
1.19 |
100
100
80 - 100
20 - 45
4 - 15
| |
5. Bituminous materials
|
| |
Bituminous materials for combination should be
in compliance with general KSM 2201(asphalt for road pavement) and KSM 2206 for
open grade asphalt and road pavement, which are suitable for the kind of
pavement, operation method, traffic and weather condition. |
6. Quality of asphalt mixtures for
normal temperature |
| |
1) Mixing ratio : Aggregates tested for strength and the above standard
bituminous materials should be mixed by the standard ratio.
2) mashal
stability : It should be over 250kg/cm3 after tamping 50 times of both sides,
left for 3 days in air and 7 days in over 200kg/cm3 mashal stability.
3) As
the mixture is applied at normal temperature, vehicles should be passed
immediately after operation, and the outer part of the mixture should not be
sticky. Foreign substances of sand and earth should not be spread after the
construction, and the mixture surface should not be whitened as time passes.
4) Even after 6 months from keeping period, it should not be hardened or
maintain adhesive power.
5) Mixture standard |
| |
|
Item |
standard |
Remarks |
|
Marshal stability(kg/cm3) |
Over 200kg |
Refer to test method |
|
Density(g/cm3) |
2.00-2.35 |
|
|
Flowage(1/100cm) |
20-40 |
| |
| |
6) Test method : After tamping both sides used in Marshal stability test 50
times and leaving it for 3 days in the normal air.
Test : Over 200 kg/cm3
After leaving it for 7 days : Over 250 kg/cm3
7) Mixing method
It should be completely mixed by a steel mixer, and temperature in mixing
should be normal, that is 10℃-60℃. |
7. Test method |
| |
1) Test for aggregate : KSF 2357, KSF 2358
2) Test for bituminous
materials : KSM 2201, KSM 2208
3) Test for bituminous mixtures : KSM 2337
and other tests |
8. Dense pavement |
| |
Delivery(PE, over 2u m/m thickness)
manufacturer, weight, standard should be mentained in vacuum sealing pavement.
|
9. Examination and inspection
|
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1) Examination : By test record of the
manufacturer of asphalt mixture for normal temperature The designated institute
may perform a middle test in the course of manufacturing to check the quality
and standards of manufacturing.
2) Inspection :
Sense test by the inspector of the designated institute |
