ASSESSMENT OF MATERIAL PROPERTIES OF CONCRETE GRAVITY DAMS – AN INDIAN CASE STUDY


Figure 2 Test setup for uni-axial compression testing of concrete in a strain controlled machine (3000kN)


The comparison of designed concrete strength for Type A (3 ft. thick concrete on surroundings of galleries), B (mass concrete) and C (6 ft. thick concrete on upstream face) concrete used in the dam, and the experimentally obtained equivalent cube compressive strength under the present investigation, are given in Table 1. For concrete Type A, Poisson’s Ratio = 0.21, Modulus of Elasticity = 25,265N/mm2, and Split Tensile Strength = 2.04N/mm2. For concrete Type B, Poisson’s Ratio = 0.20, Modulus of Elasticity = 25,955N/mm2 and Split Tensile Strength = 3.39N/mm2. For concrete Type C, Poisson’s Ratio = 0.20, Modulus of Elasticity = 27,691N/mm2 and Split Tensile Strength = 2.52N/mm2. The coefficient of thermal expansion values for Type A concrete varied from 9.09 × 10-6 to


14.71 × 10-6, for Type B concrete varied from 9.91 × 10-6 to 14.05 × 10-6, and for Type C concrete varied from 9.21 × 10-6 to 13.92 × 10-6, respectively. The average coefficient of permeability values for Type A, Type B, and Type C concrete were 3.07 × 10-11, 3.10 × 10-11 and 4.54 × 10-11, respectively.


Table 1. Test results of concrete compressive strength


Vol XXXII Issue 1


DAM ENGINEERING


9


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