civil engineering testing Method

1. SCOPE 1.1 This standard ( Part 16 ) covers the laboratory method for determination of California Bearing Ratio ( CBR ). 2. TERMINOLOGY 2.0 For the purpose of this standard, the definitions given in IS : 2809- 1972? and the following shall apply. 2.1 Standard Load - Load which has been obtained from the test on crushed stone which was defined as having a California Bearing Ratio of 100 percent ( see also 7.3 >. 2.2 California Bearing Ratio (CBR) - The ratio expressed in percentage of force per unit area required to penetrate a soil mass with a circular plunger of 50 mm diameter at the rate of 1’25 mm/min to that required for. corresponding penetration in a standard material. The ratio is usually determined for penetration of 2’5 and 5 mm. Where the ratio at 5 mm is consistently higher than that at 2’5 mm, the ratio at 5 mm is used. 3. APPARATUS 3.1 Moulds with Base Plate, Stay Rod and Wing Nut - These shall conform to 4.1, 4.3 and 4.4 of IS : 9669 - 19801. 3.2 ...