Verge or footway 150
Finished road surface 125 Finished road surface 125 250x125 Polymer modified kerb friction course (PMFC) 50 Wearing course (Optional) 150 Base course . n 20/20 concrete backing i Road-base 150 m
(See Note 3) Sub-base
150 Subgrade 20/20 concrete foundation 1:3 cement mortar
PAVEMENT CROSS-SECTION
Layers Material Thickness
Polymer modified Bituminous friction course 30 Applications refer to RD/GN/011 and RD/GN/032 (non-structural layer) (Optional)
Wearing course 40 Total thickness to be designed to RD/GN/042 and (i) min. 350 for Expressway, Trunk Road, and
Base course Bituminous 65 Primary Distributor, or (ii) min. 280 for all other roads except low-volume roads
Road base max. 395 (iii) min. 205 for low-volume roads
Sub-base Granular Designed to RD/GN/042
THICKNESS OF PAVEMENT LAYERS
Overlap (see Note 2)
Cut back distance Prepared joint (See Note 1 ) D
Notes: JOINTS IN BITUMINOUS MATERIALS LAYERS
1. Minimum cut back distance = 2 x D or 100 whichever is greater. 2. Minimum overlap between adjoining layers: 150 for joints longitudinal to carriageway. Original 500 for joints transverse to carriageway. C Include PMFC layer Jan 17 Signed 3. Where the crossfall of road surface is towards the kerb the Table for thickness revised to tally sub-base should be carried through to the edge of the B - Nov 13 with RD/GN/042 embankment or to the filter drain. Table for thickness revised July 11 4. Refer to the general specification for the nominal sizes of materials. A -
5. Kerb units shall be laid on 1 : 3 cement mortar not less than Former Drg. No. H1016/A June 94 - 10 mm thick and not more than 40 mm thick. with general revision
6. All dimensions are in millimetres. REF. REVISION SIGNATURE DATE
HIGHWAYS DEPARTMENT
TYPICAL BITUMINOUS REFERENCE DRAWING No. CAD RD/GN/042 PAVEMENT CONSTRUCTION SCALE H 1101C Diagrammatic