The aggregates should be weighed (Weight ‘A’). iv) The aggregates should then be placed in an oven at a temperature of 100 to 110 o C for 24hrs. It should then be removed from the oven, cooled and weighed (Weight ‘B’). Formula used is Water absorption = [(A – B)/B] x 100% .
What is the absorption of aggregate?
Absorption – the increase in the mass of aggregate due to water being absorbed into the pores of the material , but not including water adhering to the outside surface of the particles, expressed as a percentage of the dry mass.
What is absorption capacity of aggregate?
Absorption capacity (AC) — maximum amount of water the aggregate will absorb. The range for most normal-weight aggregates is 1 – 2% .
How do you calculate water absorption of fine aggregate?
The aggregates should be weighed (Weight ‘A’). iv) The aggregates should then be placed in an oven at a temperature of 100 to 110 o C for 24hrs. It should then be removed from the oven, cooled and weighed (Weight ‘B’). Formula used is Water absorption = [(A – B)/B] x 100% .
How do you calculate water absorption?
It is calculated as the moisture content , which is equal to: (weight of the container with wet soil minus the weight of the container with dry soil) divided by (weight of the container with dry soil minus the weight of the container), then multiplied by 100 to express it as a percentage.
What is the maximum limit of water absorption of aggregate?
The maritime code BS 6349 specifies that water absorption should not exceed 3% , or 2% in critical conditions such as highly aggressive chloride or freeze–thaw exposure, when tested in accordance with BS 812-2. The drying shrinkage test in BS 812 Part 120 is limited to aggregates with water absorption <3.5%.
What is the use of effective absorption capacity?
In this paper, the terminology “effective absorption capacity” (EAC) is used [21]. It is based on the assumption that an absorptive material would absorb pore solution only up to a state where moisture equilibrium is reached within the matrix .
What is the water absorption of fine aggregate?
According to BS 8007, aggregates should comply with either BS 882 or BS 1047 and have an absorption, as measured in accordance with BS 812-2, generally not greater than 3% . The Civil Engineering Specification for the water industry (CESWI) follows BS 8007 and water absorption should not exceed 3%.
What is ASTM C128?
ASTM C128 : Standard Test Method for Relative Density (Specific Gravity) and Absorption of Fine Aggregate .
Why is it important to determine the water absorption of fine aggregate?
Water absorption may also be an indicator of asphalt absorption. A highly absorptive aggregate may result in a low durability asphalt mix. ... The absorption is important in determining the net water-cement ratio in the concrete mix .
Why is water absorption test done?
water-absorption test A test to determine the moisture content of soil as a percentage of its dry weight (British Standard 1377, 1967). The sample is weighed, dried in an oven, then reweighed under standard conditions.
Why do we test water absorption?
Water absorption is used to determine the amount of water absorbed under specified conditions . ... The data sheds light on the performance of the materials in water or humid environments.
What is meant by water absorption?
Water absorption is defined as the amount of water absorbed by a material and is calculated as the ratio of the weight of water absorbed to the weight of the dry material.
What is the maximum absorbtion limit for coarse aggregate under water for 24 hours?
Max water absoption limit for coarse aggregates in any climatic condition should not be more than 2% . And for fine aggregates range varies from 0.3–2.5%. Max permissible limit of fine aggregates is 3%.
Which of the following is a soft aggregate?
Which of the following is a soft aggregate? Explanation: Bricks are not actually aggregates, but the crushed bricks or over burnt bricks are used as aggregates in pavement they are not so hard as the hard aggregate.
What is the usual range of water absorption in 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% .
