العربية1. Core Physical Specifications
Parameter Standard Range Int’l Standards Egyptian Quarry Compliance
Density ≥2.6 g/cm� EN 13383 / CIRIA/CUR 2.65�2.75 g/cm�
Compressive Strength 120�180 MPa ASTM C170 / BS EN 1926 130�160 MPa
Water Absorption ≤0.6% ASTM C97 0.2�0.5%
Abrasion Resistance Los Angeles (LA) ≤25 ASTM C131 LA 18�22
Freeze-Thaw Loss ≤5% (after 15 cycles) ASTM D5312 ≤3%
Solubility ≤3% (in saline water) ASTM D3042 ≤1.8%
2. Grading (Size/Weight Classification)
Class Weight Range Typical Dimensions Use Case
Class IV 1�3 tonnes 80�120 cm Core layer
Class V 3�6 tonnes 120�180 cm Primary armor layer
Class VI 6�10 tonnes 180�250 cm High-energy zones/harbors
Note: Beni Hassan quarries specialize in Class IV�V. Class VI requires selective quarrying.
3. Shape & Surface Requirements
Angularity Index: ≥80% (min. 3 mechanically fractured faces)
Interlock Ratio: 1:1.5 (height:width) for stability
Fines Content: ≤3% (material 3 tonnes
Marking: Spray-painted class code (e.g., BW-V) + quarry ID
6. African Project Adaptations
West Africa: Add mangrove root penetration resistance test
East Africa: Increase density to ≥2.7 g/cm� for cyclone zones
Certification: Mandatory SGS or Bureau Veritas inspection for:
Angola, Nigeria, Mozambique (petroleum hub requirements)
📜 Sample Tender Specification Clause
*”Breakwater stones shall be Class V (3�6 tonne) natural limestone, quarry-run from Beni
Hassan formation.
Conforming to EN 13383 & CIRIA Rock Manual. Densit