AGGREGATE SPECIFICATIONS COMPARED TO STEVIN ROCK GABBRO OF KADRA 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 ASTM C-117 <16 % <1 % 7-9 % <1% For normal SR matl.
3 Clay lumps and friable ASTM C-142 - <1% 0.18% 0.10%  
  particles            
4 Light weight pieces ASTM C-123 <0.5 % <0.5 % <0.1% <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 % <1.5% 0.3-0.4%  
7 Specific gravity (apparant) ASTM C-128,127 >2.6 >2.6 2.70-2.73 2.70-2.73  
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)  20-32mm     depend-   7-13% Flakiness and
  ii)  10-20mm     ing on   8-14 % Elongation of
  iii) 5-10mm     appli-   18-25 % <25% can be
  b) Elongation index BS 812 P-105.2   cation     achieved to
  i) 20-32mm         20-27% meet specific
  ii) 10-20mm         22-30 % client requirement.
  iii) 5-10mm         20-27 %  
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 % 0.02-0.05 %    
  SO3            
12 Soundness, MgSO4 ASTM C-88 <12 % <12 % <8 % <5 %  
13 Mechanical strength            
  a) 10% fines value or BS 812 P-111 - >100 kN - 370-430 kN  
      Impact value BS 812 P-112 - <30 % - 7-11 %  
  b) Los Angeles abrasion ASTM C-131 - <30 % - 11-17%  
14 Drying shrinkage BS 812 P-120   <0.05 %   0.034%  
15 Potential reactivity ASTM C-289   Innocuous   Innocuous  

*-<0.01% For Pre stressed concrete