Why is the determination of the specific gravity and absorption of aggregates necessary?
Why is the determination of the specific gravity and absorption of aggregates necessary?
Specific gravity test of aggregates is done to measure the strength or quality of the material while water absorption test determines the water holding capacity of the coarse and fine aggregates. The main objective of these test is to, To measure the strength or quality of the material.
How do you calculate specific gravity of aggregates?
Apparent Specific Gravity of Aggregates: It is calculated by measuring the weight of the oven-dry aggregate divided by its absolute volume excluding the natural voids in the aggregate particles.
What is specific gravity and water absorption of coarse aggregate?
The specific gravity of coarse aggregate as per is code is 2.5 to 3. The water absorption of aggregate ranges from 0.1 to 2%.
What is sieve analysis of coarse aggregate?
A sieve analysis or gradation test determines the distribution of aggregate particles by size within a given sample. This information can then be used to determine compliance with design and production requirements.
Why is coarse aggregate specific gravity?
Specific Gravity is important for several reasons. Some deleterious particles are lighter than the good aggregates. Specific gravity is critical information for the Hot Mix Asphalt Design Engineer. The value is used in calculating air voids, voids in mineral aggregate (VMA), and voids filled by asphalt (VFA).
What is the difference between specific gravity and apparent specific gravity?
The true specific gravity of a body is based on the volume of solid material, excluding all pores. The apparent specific gravity is based upon the volume of the solid material plus the volume of the sealed pores.
Why is specific gravity significant for aggregates in which way does it influence the construction of the building?
Aggregate specific gravity is needed to determine weight-to-volume relationships and to calculate various volume-related quantities such as voids in mineral aggregate (VMA), and voids filled by asphalt (VFA).
What are the tests for aggregates?
Aggregate tests
- Crushing test.
- Abrasion test.
- Impact test.
- Soundness test.
- Shape test.
- Specific gravity and water absorption test.
- Bitumen adhesion test.
What is a sieve analysis or grade test?
A sieve analysis or gradation test determines the distribution of aggregate particles by size within a given sample. This information can then be used to determine compliance with design and production requirements. Data can also be used to better understand the relationship between aggregates or blends and to predict trends during production.
What is the size and weight of a sieve?
Sieve analysis of fine and coarse aggregate Sieve No. Size (mm) Sieve Weight (lb) Sieve weight (W/Agg) Aggregate Weight (lb) l” 25 1.258 1.522 0.264 3/4″ 19 1.287 5.578 4.291 3/8″ 9.5 1.176 2.072 0.896 1/4″ 6.3 1.166 1.204 0.038
What percentage of coarse aggregate passes through a sieve?
The coarse aggregate passed the grading requirements of 1” sieve. From table 1, the cumulative percentage that passed through sieve (1”) was 95.2%. The gradation requirements for coarse aggregate (ASTM C 33) requires that the cumulative percentage of aggregate passing be in the range of 90-100.
What is the ASTM c136 standard for sieving aggregates?
For coarse aggregates, ASTM C136 specifies that mass retained in kg shouldn’t exceed the product of 2.5 × (sieve opening, mm × (effective sieving area, m2)). Allow enough time on a sieve shaker or testing screen for complete separation.
