LINEAR SHRINKAGE LINEAR SHRINKAGE LINEAR SHRINKAGE

linear

1. LINEAR SHRINKAGE TEST 25cm

2. Linear shrinkage :- The material to be tested is placed in the mold in a fluid or plastic state. The linear shrinkage measured is the change in length that occurs after the material is rigid enough and strong enough to move the studs. Percent shrinkage :- ( L0 –L /L0 ) × 100 where: Lo = original length (length of standard bar), L = Change in length after curing

3. LINEAR SHRINKAGE TEST The Linear Shrinkage (LS) test will be carried out according to the procedure from British Standard Part 2 (1990). The dimensions of the mold used in the test are 14 cm long and 2,5 cm in diameter. The soil sample has to pass through no. 40 sieve. Add distilled water until the water content of the soil closes to LL. Then, apply a thin layer of petroleum jelly to its mold and place the sample inside the sample mold. Place the sample in the oven for 24 hours at 105°C. According to BS 1377, 1990, the value of LS can be calculated using equation (1). 𝐿𝑆 = (1 − LD/LO) x 100 ( 1) with L D is the length of the oven-dried sample (in mm), and L O is the original length of the sample (in mm).

4. The soils in the mould were allowed to air dry for 7 days. Linear shrinkage was determined using the formula given below. Linear shrinkage= (Length of original sample-Length of dry sample) *100/ (Length of original sample)

5. The linear shrinkage value of specimen with various cement content and 20% water is determined by: LS = Ls/L × 100. Whereas, LS is linear shrinkage. Ls is the longitudinal shrinkage of the specimen in mm, L is the length of the trough, which is 250 mm