JKR-SPJ Section 7, explained.
JKR Standard Specifications for Roadworks (commonly cited in tender documents as JKR-SPJ) is published by the Public Works Department of Malaysia (Jabatan Kerja Raya). Section 7 is the section that covers earthworks, slopes, and the geosynthetics specified within them. This post is a knowledge-sharing reference to help engineers, QSs, and tender reviewers navigate the section. For the authoritative text, refer to the current JKR-SPJ edition issued by JKR.
Earthworks, slopes, geosynthetics.
Section 7 of JKR-SPJ defines the technical requirements for the earthworks scope of a roadworks contract under JKR. The section is typically organised into clauses covering:
- Site clearance, stripping of topsoil, and disposal
- Excavation classification (common, hard material, unsuitable, etc.) and measurement
- Selection, placement, and compaction of fill material
- Cut and fill slope geometry and protection
- Subgrade preparation and CBR requirements
- Drainage including sub-soil drainage and slope drains
- Geosynthetic materials for separation, filtration, drainage, reinforcement, and erosion control
- Measurement and payment
Across these clauses, geosynthetic specifications appear in multiple places: separation geotextile between sub-base and weak subgrade, reinforcement geogrid for retaining structures and basal mats, drainage geocomposite for slope drains, and erosion-control mats for slope surface protection.
Property-based specification.
JKR-SPJ typically specifies geosynthetic materials by property: tensile strength (wide-width per ASTM D4595 or ISO 10319), AOS or O95 (ASTM D4751), permittivity (ASTM D4491), grab tensile (ASTM D4632), CBR puncture (ASTM D6241), mass per unit area (ASTM D5261), and equivalent ISO references. The minimum values are stated as MARV (Minimum Average Roll Value) or sometimes as Typical Value, with statistical interpretation matching the ASTM convention.
For separation geotextile, JKR-SPJ commonly aligns with AASHTO M288 Class 1, Class 2, or Class 3 depending on the severity of installation conditions. Class 1 (highest property requirements) is typical under high-quality crushed aggregate over a competent subgrade with low installation damage risk; Class 3 (lower requirements but always for geotextile robust enough for the service) reflects more demanding installation conditions.
For reinforcement geogrid, JKR-SPJ cross-references BS 8006 and FHWA-NHI-10-024 for MSE wall design, with property specifications referenced to ASTM D6637 (tensile) and ISO 13431 (creep / reduction factors).
What Section 7 cites by name.
| Standard / specification | Why cited in Section 7 |
|---|---|
| BS 8006-1, 8006-2 | Reinforced soil (MSE walls, RSS) design code of practice |
| BS 6031 | Earthworks code of practice |
| AASHTO M288 | Geotextile material specification for road and bridge construction |
| ASTM D4595, D4751, D4491, D4632, D5261, D6241, D6637 | Test methods for geosynthetic properties |
| ISO 10319, 11058, 12956, 13431 | International equivalents for tensile, permeability, opening size, reduction factors |
| FHWA-NHI-10-024 | MSE wall design manual |
| FHWA-NHI-07-092 | Geotextile design and construction guidelines |
| NCMA SRW Design Manual | Segmental retaining wall design (modular block) |
The practical effect is that a tender response under JKR-SPJ Section 7 must demonstrate, for each geosynthetic, the matching property values from a third-party test certificate referencing the cited standard. STRATA, like other major manufacturers, supplies these test certificates as part of the project datasheet pack.
Three checks that catch most mistakes.
- Does the property value cited in the tender match a current JKR-SPJ Section 7 clause and reference standard? If the value is invented or pre-dates a published edition, the spec may be defective.
- Are the geotextile separation, reinforcement, and drainage roles specified separately? A single "geotextile" line item with mixed roles is a common source of disputes during installation.
- Is MARV vs Typical Value stated? A property given as Typical Value with no MARV qualifier creates QA ambiguity; the conservative position is to demand MARV interpretation per ASTM D4759.
JKR-SPJ availability.
The current JKR-SPJ edition is published by JKR and distributed to JKR-registered contractors. The text is not freely available online in full. For verification of any clause cited in this post, refer to the current JKR-SPJ edition. Where this post and the source document disagree, the JKR-SPJ source is authoritative.
Cross-reference topics.
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