B.Tech Civil Strength of Concrete — practice questions
25 free MCQs with worked solutions. Tap any question for the answer + explanation, or practice them all in the app.
Practice B.Tech Civil Strength of Concrete in the app →Per §7.1, the single most important property used to qualitatively indicate most other properties (durability,Per §7.2, water-cement ratios above approximately 0.38 (with full hydration) tend to produce concrete that:Per §7.2, the presence of 5 percent entrapped air voids in concrete can typically reduce its compressive strenPer §7.2 and Equation 7.1, Abram's law expresses the 28-day compressive strength S of concrete primarily as a Per §7.2 (Eq. 7.1A), Feret's strength formula for concrete incorporates not just cement (C) and water (e) but Per §7.2 ('Effective Water in the Mix'), the water content used to compute strength should be taken AFTER:Per §7.2 ('Aggregate Shape and Texture'), under uniaxial compression vertical cracking in a concrete specimen Per §7.2 ('Richness of Mix'), the aggregate/cement ratio is typically taken as 'very rich' and 'very lean' resPer §7.2 ('Age of Concrete'), the 28-day strength of normal concrete typically represents what fraction of thePer §7.2 ('Age of Concrete'), in normal working conditions the 7-day compressive strength of OPC concrete is tPer §7.2 ('Age of Concrete'), in the Accelerated Curing Test the cast and moist-cured cubes are then placed inPer §7.2 ('Maturity of Concrete'), the datum temperature taken in maturity calculations (because hydration almPer §7.2 ('Maturity'), the standard maturity of concrete cured at 18°C for 28 days is approximately:Per §7.3, the determination of compressive strength is preferred as the primary test because:Per §7.4 (Bond Strength), the bond strength between concrete and steel reinforcement remains approximately linPer §7.4, a rise in temperature affects the bond strength between concrete and steel. At 200°C to 300°C the boPer §7.5 (Impact Strength), impact strength of concrete relative to its compressive-strength test results typiPer §7.6.1, in the standard determination of the Modulus of Elasticity the cylindrical concrete specimen used Per §7.6.1, for practical design, concrete may reasonably be treated as a linear-elastic material up to about Per §7.6.1, the dynamic modulus of elasticity of concrete determined by ultrasonic-pulse / longitudinal-vibratPer §7.6.2, the modulus of elasticity of concrete typically scales approximately as which function of its compPer §7.6.3, creep of concrete is best defined as the:Per §7.6.3, if the creep deformation at 1 year is taken as unity, the source quotes the relative creep at 30 yPer §7.6.3, the physical mechanism most often cited for creep deformation in concrete is:Per §7.6.4, the three types of shrinkage recognised in hardened-concrete deformation are: