The crushed aggregate is allowed to pass through 2.36 mm IS sieve. And the impact value is measured as percentage of aggregates passing sieve (W2) to the total weight of the sample (W1). Aggregate impact value = (W1/W2)*100. Aggregates to be used for wearing course, the impact value shouldn’t exceed 30 percent.
FRACTURE TOUGHNESS AND MICROSTRUCTURE OF CONCRETE AT EARLY-AGES , Fine aggregate: Natural river sand with a fineness modulus of , Aggregate Properties - The Concrete Portal. Properties of concrete aggregates: Cement Aggregat , and toughness The strength of aggregate tested independently is generally always …
Concretes with such aggregate usually weight above 4000 kg/m 3. (iii) Light weight Aggregate. They consist of natural and artificial materials of very low density so that the resulting concrete is also quite Light in weight, generally with in a range of 350 to 750 kg/m 3. They are specially used in sound proofing and fire proofing constructions.
Typically, coarse aggregate sizes are larger than 4.75 mm (5 mm in British code), while fine aggregates form the portion below 4.75 mm. A maximum size up to 40 mm is used for coarse aggregate in most structural applications, while for mass concreting purposes such as dams, sizes up to 150 mm may be used.
C131, C535). In this test, a sample from the aggregate of interest is blended to a fixed grain size distribution and then placed in a steel drum with standardized steel balls. The drum is rotated for 500 rotations and the aggregate is then recovered. The recovered aggregate is then placed on a sieve that retained 100% of the initial sample.