1. 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