What is ASTM C40?
ASTM C40 / C40M – 20 Standard Test Method for Organic Impurities in Fine Aggregates for Concrete.
What is organic impurities test?
The Organic Impurities Test is used to determine the presence of injurious organic compounds in sand to be used in cement mortar or concrete. The test serves as a warning that further tests of the sands are necessary before they are approved for use.
What is ASTM C128?
ASTM C128 : Standard Test Method for Relative Density (Specific Gravity) and Absorption of Fine Aggregate.
What are the impurities of sand?
Clay, silt, salts, mica and organic matter are a source of impurities in sand. All sands are generally found to contain some percentage of silt and clay. Mica is easily discernible from its shining surface.
What is Aashto t27?
AASHTO T 27, 2020 Edition, 2020 – Standard Method of Test for Sieve Analysis of Fine and Coarse Aggregates. This method covers the determination of the particle size distribution of fine and coarse aggregates by sieving.
How do you know if sand is bulking?
Procedure
- Pour the sand into 250 ml measuring cylinder up to the 200 ml mark.
- Fill the cylinder with water and stir well (sufficient water should be poured to submerge the sand completely and it can be seen that the sand surface is now below its original level)
- Take the reading at the sand surface (Y ml)
When performing ASTM c128 on the aggregate How is SSD determined?
The SSD relative density and absorption are determined after soaking the aggregate in water for a prescribed duration. 1.2 This test method is not intended to be used for lightweight aggregates that comply with Specification C332 Group I aggregates.
How do you test for sand cleanliness?
Rub the sample of the sand with wet palms. Good clean sand will not stick to the hand, whereas sand with clay will stick and change the colour of the palm. Such sand contains clay and silt particle.
How do you test for impurities in sand?
To test for organic matter impurities in sand, shake some sand in a plain glass bottle with an equal volume of a 3% solution of caustic soda (100 gm of caustic soda in 4 litres of water), and let this stand for 24 hours. The liquid above the sand should not be darker than light straw (pale yellow) colour.