Irc Sp 63 2004 Pdf Free Download

D.V .Bhavanna Rao M.Tech., F.I.E., PM, TPQA, NCRMP egis-India consulting engineering services
In Joint Venture
IRC: 58-2002, Guidelines for the design of Plain Jointed Rigid Pavements for Highways IRC: 15-2002, Code of practice for Construction of Cement Concrete Roads IRC: 44-2008, Guidelines for cement concrete mix design for pavements IRC:SP 62 – 2004, Guidelines for desgn of CC roads for Rural Roads
Design Guidelines of IRC:58-2011 are applicable for roads having a daily commercial traffic (vehicles with laden weight more than 3t) over 450 Design guidelines contained in IRC:SP:62-2004 are applicable only for low volume rural roads. It is also applicable for conventional screedcompacted pavements and roller compacted concrete pavements.
Modulus of sub-grade reaction k corresponding to CBR CBR Values % K-Value N/mm2/mm×10-3
2
3
4
5
7
10
15
20
50
21
28
35
42
48
55
62
69
140
Effective k value may be taken as 20% more than sub-grade k value when sub base is provided.
Sub base for Rural Roads as per IRC:SP:622004 1) It provides a uniform and reasonably firm support 2) It prevents mud-pumping on sub-grade of clays and silts 3) It acts as a levelling course on distorted, no-uniform and undulating sub-grade 4) It acts as a capillary cut-off
Thickness of sub-base 1)For a designed wheel load of 51 kN, 150mm thick WBM or GSB may be provided 2) For a designed wheel load of 30 kN, 75mm thick WBM or GSB may be provided. Note: When the above type of sub-base is provided, effective k value may be taken as 20% more than k value of the sub-grade. A plastic sheet of 125 micron thick shall be provided over the sub-base to act as a separation layer between the sub-base and concrete slab.
Recommended Temperature Differentials for Concrete Slabs as per IRC: SP:62-2004 Temperature Differential, ºC in Slabs of Thickness Zone
Stages
15 cm
20 cm
25 cm
30 cm
1
Punjab, U.P. Rajasthan, Haryana and North M.P. excluding hilly regions and coastal 12.5 areas
13.1
14.3
15.8
2
Bihar, West Bengal Assam and Eastern Orrisa excluding hilly regions and coastal 15.6 areas
16.4
16.6
16.8
3
Maharashtra, Karnataka, South M.P., Andhra Pradesh, Western Orissa and North Tamil 17.3 Nadu excluding hilly regions and coastal areas
19.0
20.3
21.0
4
Kerala and South Tamil Nadu excluding hilly 15.0 regions and coastal areas
16.4
17.6
18.1
5
Coastal areas bounded by hills
14.6
15.8
16.2
17.0
6
Coastal areas unbounded by hills
15.5
17.0
19.0
19.2
TYPES OF JOINTS a)CONTRACTION JOINTS
b) LONGITUDINAL JOINTS c) EXPANSION JOINTS d) CONSTRUCTION JOINTS
FORMATION OF JOINTS  
 
Use of Preformed strips for forming joints Metal T Crack inducers Sawn joints
a) CONTRACTION JOINTS: These are purposely made weakened planes which relieve the tensile stresses in the concrete caused due to changes in the moisture content (Drying shrinkage) and/or temperature and prevent the formation of irregular cracks due to restraint in free contraction of concrete. They are also provided to 1) Relieve stresses due to warping. 2) To permit the contraction of the slab
Details of the contraction joints are given in IRC:SP 62. They are formed initially by sawing a groove of 3-5 mm with up to about one-fourth to one-third the slab thicknesses. This facilitates the formation of a natural crack at this location extending to the full depth. In order to seal the joint, the top 10-20 mm of this groove is widened to 610 mm. Spacing of contraction joints may be kept at 2.50m to 3.75m. Length of panel shall not be more than width of panel.
b) LONGITUDINAL JOINTS: Lanes are jointed together by joint known as Longitudinal joint Longitudinal joints are provided in multilane pavements and also when the pavement is more than 4.5 m wide. They are provided normally at 3.5m c/c to 1) Relieve stresses due to warping. 2) To allow differential shrinkage & swelling due to changes of sub grade moisture 3) To prevent longitudinal cracking
Initially joint is cut to a depth 1/3rd slab thick ± 5mm. Tie bars are provided at the joints not for load transference but for keeping the adjoining slabs together. The details of such joints are given in IRC:SP 62. The top 15-20 mm of the joint is sawn to a width of 6-8 mm for sealing .
c) Expansion joints There are full-depth joints provided transversely into which pavement can expand, thus relieving compressive stresses due to expansion of concrete slabs, and preventing any tendency towards distortion, buckling, blow-up and spalling. The current practice is to provide these joints only when concrete slab abuts with bridge or culvert. • They allow expansion of slabs due to temperature • They permit contraction of slabs
Normal Details of these joints are given in IRC:SP62. They are about 20 mm in width and at a maximum spacing of 50m.
A joint filler board of compressible material conforming to IRC:SP:62 is used to fill the gap between the adjacent slabs at the joint. The height of the filler board is such that its top is 23-25mm below the surface of the pavement. The joint groove is filled by a sealant .
Expansion Joint Dowels: 25mmdia., 500mm long and spaced at 250mmc/c
Filler board: compressible Joint filler 20mm ± 1.5mm Filler depth 25mm ± 3mm lower than slab thickness Dowel bars (MS rounds) to be covered with plastic sheathing for ½ length +50mm
d) Construction joints:
The need for such joint arises when construction work is required to be stopped at a place other than the location of contraction or an expansion joint, due to some breakdown of the machinery or any other reason. Such joints are of butt type and extend to the full depth of the pavement. The sealing of such joints shall be done in the same manner as for contraction joints, by cutting a groove 10-12 mm wide and 20-25 mm deep. Generally, such joints are avoided in highways. The work is normally terminated at a contraction or expansion joint.
Mild steel dowell rods with sheathing and caps. Groove cutting in progress
Shuttering sheets for MS dowels just removed
Details of joints in cement concrete pavement for rural roads As per IRC:SP:62-2004
TABLE 5 : CONCRETE PAVEMENT THICKNESS FOR RURAL ROADS as per IRC:SP 62-2004
Concrete grade
30
Pavement Thickness(mm) Low Traffic Heavy Traffic (Wheel Load-30 kN) (Wheel Load-51kN) Zone-II, Zone-II, Zone-I Zone-III Zone-I Zone-III IV,V,VI IV,V,VI Temperature Differential oC 15.1o to 17. 1o to 15.1o to 17. 1o to o o < 15