| Rapid to Construct, Rapid to Open for Traffic, Concrete Pavement
RCCP
(Roller Compacted Concrete Pavement) | |
RCCP (Roller Compacted Concrete Pavement) is a concrete pavement that uses ultra hard concrete decreasing water compared to ordinary concrete. RCCP is able to construct with the same equipment as asphalt pavements, laid by the same pavers and compacted by rollers.
- As the same equipment as for those of asphalt pavement are used, rapid construction is done in short time.
- As the strength grows fast enough to permit opening for traffic in a short time.
- As the drying shrinkage is small, the interval between joints can be maximized.
|  |  | - Ordinary roads, Roads in factories, Temporary roads for construction works
- Parking areas, Service areas
- Container yards, Material handling yards
- Apron and carriageway of airports
- for Binder course of Expressway and Heavily trafficked roads
| Procedure of Construction | |
- Concrete Mixing, Transportation
Concrete mixing is done at concrete plants and transportation is done by dump tracks. - Laying and Spreading
In order to secure eveness, pavers of high compaction type with double tamper screeds are used for laying and spreading. (see the Figure right side)
| | Specification of High Compaction type of Paver with Double Tamper | |
 | - Compaction, Curing
First and second compaction is done by vibrating roller (first without vibration, second with vibration) and finishing compaction is done by neumatic tire roller. After the compaction, the paved surface is covered by curing mat and cured by water spray.
| |
Standard Machines Configuration | |
 Kind of
concrete | flexural strength
after 28 days
kgf/cm2 | Maximum size
coarse aggre-
gate
(mm) | Fine aggre-
gate ratio
s/a
(%) | Water/
cement
ratio
W/C (%) | Unit
Coarse
aggre-
gate
volume | unit weight(kg/m3) | Weight ratio
of cement
(%) | Water
content
(%) | Water
(%) | Cement
C | Fine
aggre-
gate
S | Coarse
aggre-
gate
G | Additive
agent | | for RCCP | 60 | 20 | 44.0 | 40.6 | 0.80 | 104 | 256 | 936 | 1,241 | 0.640 | 10.6 | 5.4 | for conven-
tional* | 53 | 40 | 33.0 | 42.5 | 0.81 | 138 | 325 | 599 | 1,341 | 0.812 | 14.5 | 7.8 |
| Combined Gradation of Aggregate | |
 | The concrete for RCCP is continuously graded in order to attain high density and special consideration is paid for the grading of fine Aggregate in order to attain smooth texture of slab surface. And unit water volume is nearly 100 kg less than conventional concrete pavement enabling to decrease unit cement weight to 250-300 kg. As a result the mix design become economical one. | |
 The photograph below is a sample cut from RCCP pavement.
It is seen that this sample is tightly compacted from top to bottom | | Trend of Growth of Flexural Strength | |
 The figure above shows the relation between flexural strength and time elapsed. It can be seen that the concrete for RCCP achieve strength from early stage. | |
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