AGGREGATE SPECIFICATIONS COMPARED TO STEVIN ROCK LIMESTONE OF AL GHAIL QUARRY

SL.NO. TEST TEST METHOD PERMISSIBLE LIMITS TYPICAL SR MATL. COMMENTS
      FINE COARSE FINE COARSE  
1 Grading BS 812 P-103 BS 882 BS 882 BS 882 BS 882 Within limits
2 Material finer than 75 mic. BS 812 P-103 /          
  a) Crushed rock (BS 882) ASTM C-117 <16 % <1 % 7-10 % <1% For normal SR matl.
3 Clay lumps and friable ASTM C-142 - <1% 0.41% 0.30%  
  particles            
4 Light weight pieces ASTM C-123 <0.5 % <0.5 % <0.35% <0.1%  
5 Organic impurities ASTM C-40 Lighter - Lighter -  
      than ref.   than ref.    
      colour   colour    
6 Water absorption ASTM C-128,127 <2.3 % <2 % <1.0-1.2% 0.6-0.7%  
7 Specific gravity (apparant) ASTM C-128,127 >2.6 >2.6 2.75-2.80 2.75-2.80  
8 Shell content BS 812 P-106          
  a) Coarser than 10mm   - <5 % - Nil  
  b) Between 5 and 10mm   - <15 % - Nil  
9 Particle shape            
  a) Flakiness index BS 812 P -105.1   Varies      
  i)  10-20mm     depend-   7-15 %  
  ii) 5-10mm     ing on   15-23%  
  b) Elongation index BS 812 P -105.2   appli-      
  i) 10-20mm     cation   +/-30%  
  ii) 5-10mm         +/-30%  
10 Acid soluble chlorides, Cl BS 812 P-117 <0.03%* <0.01% 0.01-0.02% 0.01%  
11 Acid soluble sulphates, BS 812 P-118 <0.3 % <0.3 %
0.04-0.08 %
 
  SO3          
12 Soundness, MgSO4 ASTM C-88 <12 % <12 % <5 % <2 %  
13 Mechanical strength            
  a) 10% fines value or BS 812 P-111 - >100 kN - 190-260 kN  
      Impact value BS 812 P-112 - <30 % - 16-24 %  
  b) Los Angeles abrasion ASTM C-131 - <30 % - 17-25%  
14 Drying shrinkage BS 812 P-120   <0.05 %   0.026%  
15 Potential reactivity ASTM C-289   Innocuous   Innocuous  

* - <0.01% for pre stressed concrete