INTRODUCTION
Aggregate is one of the basic constituents of concrete. Its quality is of considerable importance because about three-quarter of the volume of concrete is occupied by aggregates. One of the physical properties of aggregate that influence the property of concrete is the grading of aggregate. The grading of aggregate defines the proportions of particles of different size in the aggregate. The grading of fine (size < 5 mm) and coarse (size > 5 mm) aggregates are generally required to be within the limits specified in BS 882: 1992.

OBJECTIVE
The objective of this experiment is to obtain the grading curve for both fine and coarse aggregate.

APPARATUS
1. Balance - balance or scale used in testing fine and coarse
Coarse aggregate sample weight : 2005 g BS Sieve Size | Weight of Sieve (gm) | Weight of Sieve + Sample (gm) | Retained Weight (gm) | Passed Weight (gm) | Retained Percentage (%) | Passed Percentage (%) | 37.5 mm | 1096 | 1096 | 0 | 2005 | 0 | 100 | 20.0 mm | 1104 | 1396 | 292 | 1713 | 14.56 | 85.44 | 14.0 mm | 1226 | 1904 | 678 | 1035 | 33.82 | 51.62 | 10.0 mm | 1217 | 1638 | 421 | 614 | 20.99 | 30.62 | 5.0 mm | 1068 | 1406 | 338 | 276 | 16.86 | 13.77 | 2.36 mm | 1029 | 1125 | 96 | 180 | 4.79 | 8.98 | Pan | 790 | 970 | 180 | 0 | 8.98 | 0 |

CALCULATION:
For 37.5mm BS sieve size of fine aggregate,

Retained weight (gm) = (weight of sieve + sample) – (weight of