Thursday, January 30, 2020
Objective:
To determine the fineness modulus of fine aggregate (sand)
Theory:
The aggregate must most of which passes IS 4.7mm sieve is classified as a fine aggregate.Fine aggregates obtained from natural disintegration of rocks and deposited by streams are known as natural sand. Fine aggregates resulting from crusing of hard stone and natural gravels are known as crushed stone and crushed gravel respectively. Sieve analysis is carried out for the determination of particle size distributed of find ,course and all in aggregate by sieving.
fineness modulus is an empirical factor abtained by adding the total percentage of sample of aggregate retained on each of a specified series of sieves dividing the sum by hundred.
Apparatus:
- Balance
- Simple
- Sieves
- The simple shall be bought to air-dry condition before weighting and sieving.
- We have to take the weight of a sample and weighted sieves and sieved successfully on the appropriate sieves starting with the largest size.
- The shaking is done YouTube right motion forward and backward left and right and with frequency jarring so that the material is kept moving over the sieve surface in frequency e changing direction.
- Find the weight of aggregate retained on each siveve take oder.
Observation and calculation:
Weight of fine aggregate taken for sieving=700gm
Result:
From this experiment we determine the fineness modulus of fine aggregate. The given sample fineness modulus is 2.8943 so this sample can be used which is coarse aggregate.
Experiment 2
Objectives:
- To determine the water observation capacity of bricks.
- To test the quality of brick.
- Water holding capacity
Apparatus required:
- BRICKS
- Drying oven
- Immersion tank
- Balance
Theory:
The water absorption of bricks is the quantity of water absorbed by a bricks in submerge underwater for 24 hour expose is a percentage of Its dry weight.
The strength of a brick depend upon its water absorption capacity the water absorption capacity of brick ok is due to the presence of voids in in the break. If the brick has more voids it will observe more water and load carrying capacity
Procedure:
- Drying the specimen in drying oven at a temperature of 110° C to 115° C for 24 hours.
- Remove double from oven ankul dam to room temperature and obtained is dry weight(w1).
- The dried specimen is immersed completely in a clean water at room temperature for 24 hours.
- Remove the spaceiment are wipout any tracks of water with damp clothes and weighing the specimen for 3 minutes after removing .Let its Wight beW2.
Observation:
Calculation:
water absorption capacity of brick percentage by mass when immersed in cold water for 24 hour is calculated by:
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