B.Tech Civil Testing 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 Testing of Concrete in the app →Three workability tests are incorporated in IS 1199–1959 for routine field measurement of fresh concrete. WhicFor a concrete mix of very low workability, which of the three IS 1199 methods is best suited?In the Rapid Analysis Machine (RAM) used to determine cement content of fresh concrete, on which physical prinStandard cube moulds for casting compression specimens are 150 mm × 150 mm × 150 mm. Under what condition is tDuring cube casting, concrete is placed in three layers and each layer is compacted by hand tamping with a steIn a compression test on a concrete cube using a UTM, at what uniform rate is the uniaxial compressive load apCube test specimens are used in India and most European countries while cylinder specimens are the standard inCylindrical compression specimens are cast in standard moulds of what internal diameter and height?Why is the top surface of a cylindrical specimen capped before compression testing?For a concrete with cube strength of 30 N/mm², the ratio of cylinder strength to cube strength is reported as:In the split-cylinder (indirect tension) test, the horizontal tensile stress along the vertical diameter is giIn the split-cylinder test, why is a 3 mm thick plywood packing strip introduced between the platen and the cyFor the splitting test on a cube of side a using a semi-cylindrical loading piece, the splitting tensile strenIn a flexure (modulus of rupture) test, the standard beam size is 150 × 150 × 750 mm when the nominal maximum Flexure beam tests use four-point loading. For the larger 150 × 150 × 750 mm beam, what is the prescribed rateIn a flexure beam test, if the fracture occurs outside the central portion CD and at a distance a from the neaFor a test core cut from a structure, the cube-equivalent strength is estimated as cube strength = 1.25 × C1 ×A core has been cut with a length-to-diameter ratio of 0.85 from a slab. As per the unit, the recommended actiThe rebound hammer commonly used in non-destructive testing of concrete was developed in 1948 and is best knowTo get a representative rebound number from a Schmidt hammer on a concrete area, the unit recommends taking hoThe portable instrument used for measuring ultrasonic pulse velocity through concrete with a digital output isUsing the Leslie–Cheesman classification (Table 9.1), a pulse velocity reading of 3800 m/s through concrete coCracks and voids inside concrete affect ultrasonic pulse velocity only when their plane is oriented in a partiIn the resonant frequency method, the dynamic modulus of elasticity of a concrete specimen is given by Ed = 4 Compared with the direct tensile strength of the same concrete, the modulus of rupture obtained from a flexure