Question
Download Solution PDFAs specified in IS 2386 (Part IV) : 1963, which of the following set of sieves are used to find the crushing value of coarse aggregates?
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFExplanation:
Crushing test: This test is carried out to assess the strength of coarse aggregate when a compressive load is gradually applied.
The test is carried out as follows:
1. The sample is broken into chips passing a 12.5 mm I.S. sieve and retained on a 10 mm I.S. sieve.
2. The material is heated to a temperature of 100°C to 110°C and it is then cooled to make it off the dry surface before testing.
3. The material is placed in a steel cylinder up to one-third height and it is tamped 25 times by the plunger. The second and third layers are also subsequently laid in a similar way and after the tamping of the third layer, the surplus aggregate is struck off by a straight edge.
4. The plunger is placed on the upper surface and a load of 40 tonnes is applied at the uniform rate of 4 tonnes per minute by the compression machine.
5. The crushed aggregate is removed and sieved on a 2.36 mm I.S. sieve. The material passing through this sieve is collected and weighed.
The aggregate crushing value is obtained by the following expression:
Aggregate crushing value = \(\frac{W1}{W2} \times 100\)
W2 = Total weight of the dry sample
W1 = Weight of material passing 2.36 mm I.S. sieve
Additional Information The aggregate crushing value should not be greater than 30% for the surface course and 45% for the base course
Last updated on May 28, 2025
-> SSC JE notification 2025 for Civil Engineering will be released on June 30.
-> Candidates can fill the SSC JE CE application from June 30 to July 21.
-> The selection process of the candidates for the SSC Junior Engineer post consists of Paper I, Paper II, Document Verification, and Medical Examination.
-> Candidates who will get selected will get a salary range between Rs. 35,400/- to Rs. 1,12,400/-.
-> Candidates must refer to the SSC JE Previous Year Papers and SSC JE Civil Mock Test, SSC JE Electrical Mock Test, and SSC JE Mechanical Mock Test to understand the type of questions coming in the examination.
-> The Staff Selection Commission conducts the SSC JE exam to recruit Junior Engineers in different disciplines under various departments of the Central Government.