Demystifying Crushed Aggregate Sizes & Base Course Pricing in Malaysia: A Contractor's Guide

Understanding crushed aggregate specifications and their associated costs is fundamental to successful construction projects in Malaysia, particularly for critical elements like road bases, asas, dan sistem perparitan. Selecting the correct aggregate size directly impacts structural integrity, compaction efficiency, drainage capacity, and ultimately project longevity and budget control.

The Crucial Role of Gradation

Aggregate gradation refers to the distribution of particle sizes within a specific material type (mis., granite crusher run). A well-graded aggregate contains a balanced mix of coarse particles (memberikan kekuatan) and finer particles (filling voids for density). Poorly graded aggregates can lead to segregation during placement, inadequate compaction resulting in settlement or instability under load ("pumping"), poor drainage leading to water retention issues (like frost heave or subgrade softening), increased permeability causing erosion within embankments or behind retaining walls.

Malaysian specifications primarily follow standards set by Jabatan Kerja Raya (JKR) – the Public Works Department – often referenced as SPJ/SPJ-Specifications. These are widely adopted across public infrastructure projects and heavily influence private sector practices.

Malaysian Crushed Aggregate Size Chart & Aplikasi biasa

Below is a detailed breakdown of commonly used crushed aggregate types in Malaysia, their standard gradations according to JKR/industry norms, primary applications based on function requirements:

1. Crusher Run / Granular Sub Base (GSB) / Pangkalan jalan
Size Range: Typically 50mm down to fines/dust.
Penggredan: Defined by JKR/SPJ specifications (mis., JKR SPJ Clause 4.2). sieve sizes:
50mm: Lebih kurang 95%-100% berlalu
37.5mm: Lebih kurang 85%-100% berlalu
20mm: Lebih kurang 60%-80% berlalu
10mm: Lebih kurang 40%-60% berlalu
5mm: Lebih kurang 25%-45% berlalu
2.36mm (8): Lebih kurang 15%-35% berlalu
<75μm (200): Usually limited to max ~10%
Primary Applications: The workhorse material.

Road sub-base layer beneath asphalt/concrete pavement.
Base course for heavy-duty pavements/parking lots.