air entrainment in concrete increases mcq

DBMS MCQ Alphabetical Series MCQ Classification MCQ Chemistry in Service of Man MCQ Phylum - Mammalia MCQ Indian Polity & Economy MCQ Viruses MCQ Urinary Calculus Disease MCQ H.C.F and L.C.M MCQ Phylum - Porifera MCQ Boats and Streams MCQ Machine Input Mi-set 2 MCQ B. strength. a) tcr - rcs = tct. Effect of Air Entrainment on Strength of Concrete: The main thing which is affected by the air entrained concrete is workability and the compressive strength of concrete. In symmetrically reinforced sections, shrinkage stresses in concrete and steel are respectively. Therefore, those in the concrete industry have long been on the hunt for ways of increasing workability without sacrificing the strength of the finished product. Although no air entraining agent is used in RC mixtures, higher air contents are measured as compared to control mixtures. Question 87 : Most of the methods of concrete mix design follow: Option-1 : water cement ratio law as a criterion of strength Option-2 : the priciple that more cement always gives more strength Option-3 : the principle that there is no air entrainment in the mix Option-4 : the assumption that concrete is … D. the unit weight. Air entrainment is the intentional creation of tiny air bubbles in concrete.A concrete maker introduces the bubbles by adding to the mix an air entraining agent, a surfactant (surface-active substance, a type of chemical that includes detergents). Air entrainment affects compressive strength of concrete and its workability. 23 Mar 2018 23 Mar 2018. Air entrainment in the concrete increases________________? 9. Concrete technology. In addition to improving durability, air entraining in general reduces bleeding, improves workability, decreases water demand, improves sulfate resistance and slightly increases watertightness. It has been noticed that air entrainment in concrete increases the resistance by about three to seven times in such a situation. - (A) workability - (B) strength a) workability. C. the effects of temperature variations. C. the effects of temperature variations Sign In Now. Civil Concrete tech mcq's July 08, 2019 Add Comment Civil MCQ'S Edit CONCRETE TECHNOLOGY. Share. On the basis of experiments carried out at Road Research Laboratory U.K., ‘WRIGHT’ has … Another term used… Follow Blog via Email. Generally, an increase in the total air content of one percent decreases the compressive strength of concrete two to five percent. Have an account? This may be due to the nonpolar nature of rubber particles and their tendency to entrap air in their rough surfaces. The relation between modulus of rupture fcr, splitting strength fcs and direct tensile strength fcl is given by. Effect on Strength of Concrete: Generally it can be said that air entrainment in concrete reduces the compressive strength of concrete. Some research suggests that chloride penetration is slowed by air entrainment up to 6%; some research suggests increased air content is neutral on Cl- penetration. Female. Hpwever, entrained air is a trade-off with strength, as each one percent of air may result in five percent decrease in the compressivs strength. Related Questions on Design of Concrete Structures Mcqs. Fresh Concrete Fresh concrete is that stage of concrete in which concrete can be moulded and it is in plastic state. Compressive strength of concrete is inversely proportional to workability of concrete. The relation between modulus of rupture fcr, splitting strength fcs and direct tensile strength fcl is given by a) tcr - rcs = tct b) fcr>fcs>fc. PLEASE COMMENT BELOW WITH CORRECT ANSWER AND ITS DETAIL EXPLANATION. A. workability B. strength C. the effects of temperature variations D. the unit weight. Answer: Option A . Continue with Google. Air entrainment in the concrete increases________________? More Related Questions on Design of Concrete Structures Mcqs. IF YOU THINK THAT ABOVE POSTED MCQ IS WRONG. This type of air entrained concrete mix can usually be found on Amazon or at most local hardware stores. (adsbygoogle = window.adsbygoogle || []).push({}); PakMcqs.com is the Pakistani Top Mcqs website, where you can find Mcqs of all Subjects, You can also Submit Mcqs of your recent test and Take online Mcqs Quiz test. IF YOU THINK THAT ABOVE POSTED MCQ IS WRONG. The air entrainment has been found to increase with mixing time upto a certain time and after prolonged mixing time it reduces sharply. The fine air bubbles entrained in the concrete are very difficult to fill with water, thus reducing the degree of saturation, and their intimate distribution ensures that the distance between neighbouring air spaces is so small that pressures created by the growth of ice crystals are reduced. ‘vater-cement ratio C. the air in the mix D. size of aggregate . A. workability B. strength C. the effects of temperature variations D. the unit weight. Using air entraining Portland cement or air entraining agents such as admixture, air entrainment is done in concrete. B. strength Air entrainment in the concrete increases a) workability b) strength c) the effects of temperature variations d) the unit weight Ans: a 9. It also depends on the aggregate gradation and nature of additional admixtures used. Concrete Technology and Design MCQ with detailed explanation for interview, entrance and competitive exams. Air-entrainment of concrete dramatically improves its resistance to freeze/thaw deterioration. Air entrainment is the process where many small air bubbles are distibuted into concrete and become part of the matrix that binds the aggregate together in the hardened concrete. D. the unit weight. Road research Laboratory U.K, it is found that 5% air entrainment increases the compacting factor by 0.07, which would be equal to an increase in slump from 1.2 cm to 5.0 cms. Other articles where Air-entraining cement is discussed: cement: Types of portland cement: Air-entraining cements are made by the addition on grinding of a small amount, about 0.05 percent, of an organic agent that causes the entrainment of very fine air bubbles in a concrete. or use. Mixing the concrete mix for 3 to 15 minutes has been found to produce optimum air content. Mcq Added by: Muhammad Bilal Khattak. A. workability d) the unit weight. b) fcr>fcs>fc. Air entrainment in the concrete increases? The property of the ingredients to separate from each other while placing the concrete is called____________? Sign In Continue with Facebook. Although the degree of these problems is in question, most studies show that at least some reduction in bond strength and increase in water penetration will occur. A. compressive and tensile. Required fields are marked *. Air entrained concrete increases … If the workability of the concrete is increasing than compressive strength is automatically decrease … You are in the ACI 318 C2 severe chloride exposure zone; Table 4.3.1 requires the concrete to have w/cm of 0.40 or less, and 5000 psi minimum strength. A very fast rotation of the mixer increases the amount of air entrained. … Air entrainment is standard practice in many countries to improve the frost resistance of concrete. 0. Workability of concrete is directly proportional to________________? The air entrained concrete due its increased advantages has various applications. Approximate value of shrinkage strain in concrete, is________________? Design of Concrete Structures Design of Concrete Structures. Concrete Technology And Design Of Concrete Structures MCQ question is the important chapter for a Civil Engineering and GATE students. The primary purpose of air entrainment is to increase the durability of the hardened concrete, especially in climates subject to freeze-thaw; the secondary purpose is to increase workability of the concrete while in a plastic state. The first thing you could do is purchase bag mix concrete with air entrainment already in it. Join The Discussion . PLEASE COMMENT BELOW WITH CORRECT ANSWER AND ITS DETAIL EXPLANATION. Your email address will not be published. Air-entrainment of mortar, however, also has been associated with lower bond strength and higher water-penetration rates. MCQs: Air entrainment in the concrete increases? Temperature • An increase in concrete temperature will decrease the air content. b) strength. 1. Properties of Fresh Concrete. Today air entrainment is recommended for most concretes, primarily to improve its resistance to cycles of freezing and thawing and deicing agents. Ans: b 10. A. time of transit B. The amount of air in such concrete is usually between four to seven percent of the volume of concrete. I Recommend QUIKRETE® Crack Resistant Concrete Mix . The effect of air entrainment on the compressive strength of high performance concrete is presented in this paper. The relation between modulus of rupture fcr, splitting strength fcs and direct tensile strength fcl is given by_______________? air contents for concrete to resist damage from cycles of freezing and thawing. Comment * Related Questions on Concrete Technology and Design of Concrete Structures. Explanation are given for understanding. 0. To determine the modulus of rupture, the size of test specimen used is a) 150 x150 x500 mm b) 100 x100 x700 mm c) 150 x150 x700 mm d) 100 x100 x500 mm 2. Facebook; Sign Up Continue with Facebook. Continue with Google. 2) Effect on Workability: The air entrainment in fresh concrete by use of air entraining admixture agent improves workability. Share the link on social media. Sika® Air-260’s patented formula provides superior control of the air content and finishability in air-entrained concrete. The … Entrained air content increases in concrete mixtures with addition of waste tire rubber particles. It is best suited in places of very low temperature since it is good at resisting freezing and thawing … This is also called "Green Concrete". This increases the resistance of the concrete to freeze-thaw damage in cold climates.… www.gtu-mcq.com is an online portal for the preparation of the MCQ test of Degree and Diploma Engineering Students of the Gujarat Technological University Exam. Concrete technology; MCQ’S; Contact; About; Search for: Tag: air entrainment in concrete increases. It is measured by galvanometric method, volumetric method and pressure method. - Spread the word. But make sure that you are purchasing the right stuff, generally it will be a Crack Resistant Mix that has air entrainment. Air entrainment is the intentional creation of tiny air bubbles in concrete. The air bubbles relieve internal pressure on the concrete … c) the effects of temperature variations. Leave … It increases the workability of concrete without much increase in water-cement ratio. For an air-entrained concrete, air content measurements are reported in the mixture design submittal, and air content is measured in the field to ensure compliance. In the total air content of one percent decreases the compressive strength of Structures... By volume in the concrete mix can usually be found on Amazon or at local! Done in concrete temperature will decrease the air entrained concrete mix can usually be found on Amazon at! 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