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Consider the following statements for air-entrained concrete: (i) Air-entrainment reduces the water demand for a given level of workability (ii) Use of air-entrained concrete is required in environments where cyclic freezing and thawing is expected Which of the following is TRUE? - gate civil 2017 1 AnswerWorkability of concrete can be measured using slump, compaction factor and Vebe time. Consider the following statements for workability of concrete: (i) As the slump increases, the Vebe time increases (ii) As the slump increases, the compaction factor increases Which of the following is TRUE? - gate civil 20171 AnswerIn the context of provisions relating to durability of concrete, consider the following assertions: Assertion (1): As per IS 456-2000, air entrainment to the extent of 3% to 6% is required for concrete exposed to marine environment. Assertion (2): The equivalent alkali content (in terms of Na2O equivalent) for a cement containing 1% and 0.6% of Na2O and K2O, respectively, is approximately 1.4% (rounded to 1 decimal place). Which one of the following statements is CORRECT?0 AnswerWhat is workability in concrete?1 AnswerThe deformation in concrete due to sustained loading is (GATE-CIVIL-Engg-2018)1 AnswerWhen a specimen of M25 concrete is loaded to a stress level of 12.5 MPa, a strain of 500×106 is recorded. If this load is allowed to stand for a long time, the strain increases to 1000×106 .0 AnswerIf a small concrete cube is submerged deep in still water in such a way that the pressure exerted on all faces of the cube is p, then the maximum shear stress developed inside the cube is -Civil Engineering-gate-20121 AnswerConsider the following statements: I. If denotes the additive group of rational numbers and f : Q -> Q is a non-trivial homomorphism, then f is an isomorphism. II. Any quotient group of a cyclic group is cyclic. III. If every subgroup of a group G is a normal subgroup, then G is abelian. IV. Every group of order 33 is cyclic. Which of the above statements are TRUE?0 Answer Using limit state method and neglecting the self weight of base plate and steel column, the length of a side of the base plate to be provided is (GATE-CIVIL-Engg-2018)1 AnswerWhich one of the following is categorised as a long-term loss of prestress in a prestressed concrete member? -Civil Engineering-gate-20121 AnswerIn India, for 1.0 cum of M-20 grade concrete, the number of cement bags required is ________ (up to two decimal places). (GATE-Architecture-Planning-2018)1 AnswerThe length of the pile required for the above design load with a factor of safety of 2.0 is (GATE-CIVIL-Engg-2018)1 AnswerThe frequency distribution of the compressive strength of 20 concrete cube specimens is given in the table.(GATE Civil engg 2018)1 AnswerWhat you mean by porous concrete?1 AnswerAn isolated concrete pavement slab of length L is resting on a frictionless base. The temperature of the top and bottom fibre of the slab are Tt and Tb, respectively. Given: the coefficient of thermal expansion = α and the elastic modulus = E. Assuming Tt > Tb and the unit weight of concrete as zero, the maximum thermal stress is calculated as0 AnswerHow much labor is required for 1 c um of concrete for placing, mixing and vibrating?1 AnswerTie bars of 12 mm diameter are to be provided in a concrete pavement slab. The working tensile stress of the tie bars is 230 MPa, the average bond strength between a tie bar and concrete is 2 MPa, and the joint gap between the slabs is 10 mm.0 AnswerA water tank is to be constructed on the soil deposit shown in the figure below. A circular footing of diameter 3 m and depth of embedment 1 m has been designed to support the tank. The total vertical load to be taken by the footing is 1500 kN. Assume the unit weight of water as 10 kN/m3 and the load dispersion pattern as 2V:1H. The expected settlement of the tank due to primary consolidation of the clay layer is _______________ mm. - gate civil 2017 1 AnswerConsider the following statements: 1) An isosceles trapezium is always cyclic. 2) Any cyclic parallelogram is a rectangle. Which of the above statements is/are correct? A. 1 only B. 2 only C. Both 1 and 2 D. Neither 1 nor 20 AnswerQ39 - gate civil 2017 1 Answer
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