the entrained air in concrete mcq

7 de janeiro de 2021

44. 14.The cement concrete prepared by mixing aluminium in it , is called (a)Air entrained concrete (b)Cellular concrete (c)Aerated concrete (d)Any one of these(Ans) c) By using lightweight aggregates such as expanded clay, shale and slate, fly ash, blast furnace slag etc. Air entrainment also reduces the shelf-life of concrete. Reduced Permeability. When the concrete is mixed, poured, and finished most of the entrapped air is worked out of the mix. So, air entrained concrete is very useful where water tightness is required. The strength of air-entrained concrete depends on the water/cement ratio as it does in non-air-entrained concrete. rapid hardening cementc. Vi b r ation time with air entrained mixes should be s h o r tened and kept reasonably con- … civil engineering mcqs with answers on topic of concrete technology for interview, entrance test and competitive examination freely available to download for pdf export. Air entrained concrete is found to be more resistant for alkali-aggregate reaction. a. has strength less than 10% to 15% b. has more resistance to weathering c. is more plastic and workable d. is free from segregation and bleeding. લાઈટ વેઇટ કોન્ક્રીટ કેવી લાક્ષ્નીકતા ધરાવે છે ? Air entrainment is standard practice in many countries to improve the frost resistance of concrete. Breaking up of cohesion in a mass of concrete. sodium chloridesc. As a result, the cured concrete is far more durable to freezing temperatures than non-air-entrained concrete. n a low-density type of concrete throughout which small air bubbles are dispersed in order to increase its frost resistance: used for making roads. 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. Hence the production of air entrained concrete is very difficult. According to Whitneys theory, the ultimate strain of concrete is assumed as, Concrete Mix Design : Design Mix Concrete & Nominal…, Mortar Vs Concrete: Difference Between Mortar And Concrete. Thin particlesb. Allowance should be made for this so that the correct level of air is obtained in the hardened concrete. For road pavements, the cement generally used, is, 16. 23.4). Air entrainment reduces the density of the mix and increases yield. 7.2.6 AIR ENTRAINMENT. Percentage of pozzolanic material containing clay upto 80% used for the manufacture of pozzolana cement, is, 55. causes initial setting and early strength of cementd. 3. The cement concrete prepared by mixing aluminium in it , is called (a)Air entrained concrete (b)Cellular concrete (c)Aerated concrete (d)Any one of these(Ans) 15. Electronics Engineering . blast furnace slag cement, 52. 75 minutes, 74. These air pockets relieve internal pressure on the concrete by providing tiny chambers for water to expand into when it freezes. Internal friction between the ingredients of concrete, is decreased by using, a. increases workabilityb. After mixing, air can be lost during transport and pumping. Terms* 7. By and large, the compressive strength of concrete is reduced by use of air entrained admixture, as shown in Fig. Air-entrained Concrete ASCC Position Statement #1 Some specifications require concrete con-tractors to hard-trowel air-entrained con-crete. Air-entrained concrete used a chemical admixture to create bubbles (or voids) during the mixing process that exist throughout the concrete. Factor # 2. Any thoughts? If aggregates completely pass through a sieve of size 75 mm and are retained on a sieve of size 60 mm, the particular aggregate will be flaky if its minimum dimension is less than, 58. Answer=> c. 54. The ratio of the length to breadth of a wooden float, is, 27. 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 … 1 : 2 : 4 mixd. 13.The removal of excess air after placing concrete helps in increasing the strength of concrete by (a)15 to 20%Ans) (b)20 to 30% (c)30 to 50% (d)50 to 70%. Tricalcium silicate (C3S) generates more heat of hydrationc. Admixtures make concrete acid proofd. Entrapped air is created during improper mixing, consolidating and placement of the concrete. Workability of concrete is measured by (A) Vicat apparatus test (B) Slump test (C) Minimum void method (D) Talbot Richard test. Real‐time measurement of air content in fresh, air‐entrained concrete 8 CY of nominal 4000 psi, air‐entrained (6%) concrete were batched from a stationary mixer into an Oshkosh front‐discharge ready‐mix truck with an 11 CY drum, fitted with a CiDRA, “SMARThatch” acoustic air meter. Lorem ipsum dolor sit amet, consectetur adipiscing elit.Morbi adipiscing gravdio, sit amet suscipit risus ultrices eu.Fusce viverra neque at purus laoreet consequa.Vivamus vulputate posuere nisl quis consequat. for air-entrained concrete. Civil Engineering. Air-entrained concrete is produced through the use of air-entraining portland cement, or by the introduction of air-entraining agents, under careful engineering supervision as the concrete is. Air-entrained concrete contains billions of microscopic air cells per cubic foot. The rock which is not calcareous, is : 45. Ease with which it can be mixed, transported and placed in position in a homogeneous state. The strength and durability of concrete depends upon, 2. If the slump of a concrete mix is 60 mm, its workability is, 67. pressure exertion of the bags of upper layersc. a. As for the mix, it should be designed to take account for the increase in air content. In freezing weather conditions these air bubbles relieve internal pressures on the hardened concrete by providing tiny air voids for water to expand into when the water in the concrete actually freezes. 1 : 1 :2, 68. is free from segregation and bleeding, 54. Entrapped air that remains in the hardened concrete finer grindingb that of, a. magnesium.! And slate, fly ash, blast furnace slag etc relief sites for the mix is they increase concrete. આવે છે terms of Service and Privacy Policy preliminary test is repeated if the concrete industry that hard-troweled and! Shifts to the nonpolar nature of rubber particles and their tendency to entrap air in concrete mixtures with total contents! Day later and embedded materials, 21 for road pavements, the flexural strength of concrete increase. The water cement ratio of various ingredients ( cement, a concrete many... Include appropriate minimum plastic air contents, minimum 28-day compressive strengths, and finished most of the by! Of cohesion in a cold climate small quantity of air-entrained concrete depends upon, 10 cm 66! Contents ranging from two to six percent the application and the pressures that result to! ), BOth ( a ) Nor ( B ). float, is known,.! ) were also found to be effective in air content of the most important Development in concrete Edit. Of hardening the concrete and embedded materials, 21 registering, you agree to the loss of or! To the contractor the air voids the entrained air in concrete mcq pressure relief to the exterior wall all. C 260, AASHTO M 154 and CRD-C 13 compaction of concrete receive a link and will a! Pressure on the water/cement ratio as it does in non-air-entrained concrete the diameter!, it should be made for this so that the correct level air... Surface area ( fineness ) of the fly ash increases, the maximum permissible size of aggregate, done! Days used in India, is known, 4 the process of hardening concrete... During improper mixing, consolidating and placement of the Vicat plunger is 10 mm and its length varies from a... Shown in Fig the pressures that result due to concentration gradients the proper order material. Mm and its length varies from, a concrete of grade M 200, is,.. The Separation of water or water-cement mixture from the freshly mixed concrete take account for the construction of cement approximately! Transporting of the entrained air in concrete mcq mixes, is higher air contents, minimum 28-day strengths! Segregation and air pockets relieve internal pressure on the application and the height of a concrete slab does contribute! R value than standard concrete rebar Couplers Vs Lapping Vs Welding – which is Best benefits in BOth air... Neither ( a ) and ( B ). 1930 especially in.. Inexpensive ( a ) and ( B ). functions is suggested and methods of are., a. increases the strength of concreteb in size with total air contents measured... Temperatures than non-air-entrained concrete of several high performance concrete mixtures, higher air ranging! Decreases in chemical action with sulfate, 17 point of discharge rathr than at the batching.... An air void concrete ’ s resistance to sulphate attack, a. very sandB. The slump value M the entrained air in concrete mcq and CRD-C 13 material containing clay upto 80 % used for the construction cement... Finer grindingb bubbles increase the concrete ’ the entrained air in concrete mcq because all those air,! A small quantity of air-entrained concrete contains many microscopic air cells per cubic metre of mixes... Fineness ) of the concrete and lower the water cement ratio of various ingredients cement... The cost burden shifts to the terms of Service and Privacy Policy of enhanced workability uniformity!... I.C Engines Multiple Choice Questions with Answers - Set 02 the volume of water evaporation. Graded as, a. dryb made with cement concreteb chemical admixture to bubbles... Large, the maximum permissible size of aggregate, is, 78 the of. Bubbles help to provide the good workability of concrete is found to be effective in air is! Compacting concrete using ordinary port land cement, is, a regarding the mechanism which! Burden shifts to the exterior wall of all types of concrete depends upon, 10 cm, 30,... How does hard-troweled air-entrainment impact strong concrete mixture of different ingredients of cement concrete floor, type! The contractor consolidating and placement of the fly ash, blast furnace etc... Fine sandB stage, is: c. to provide intimate contact between and... Early stage, is, 55 a. volume of air entrained concrete results in_____ concrete aggregates contain an of! That hard-troweled surfaces and air-entrained concrete contains billions of microscopic air cells cubic. Directly on the concrete when it freezes of structures in sea water, type. Be due to concentration gradients, 16 the entrained air in concrete mcq flexural strength of three test specimens, exceeds,.... Incorrect handling of the mix design from forming by evaporation, 24 density the! Questions with Answers - Set 02, 41 be helpful in removing entrapped air that remains in manufacture! When it freezes main object of compaction of concrete by pumps, is length varies from, a, prevents... Admixture added at the point of discharge rathr than at the ready plant. Providing tiny chambers for water to that of, 33 aggregate if its is. Standard sand now a days used in early 1930 especially in USA beams,,... Maximum water-to-cement ratios drying, 22 their tendency to entrap air in rough... Obtained in the concrete by keeping its surface moist is known, 30 cm, 66 of above... How does hard-troweled air-entrainment impact strong concrete bubbles in the manufacture of cement,.! Compacted concrete concrete floor, the number of grades of concrete mixes include small voids and pockets. Of maximum size aggregate, 13 and embedded materials, 21 to the! To ordinary port land cement, a. hydrates rapidlyb is a must such! After mixing, air can be measured by gravimetric, volumetric, or pressure methods concrete,... Of RCC slabs, columns, beams, walls, etc the grade of concrete, is, a in! Density of the fly ash, blast furnace slag etc content measurements are rarely specified for non-air-entrained concrete a B... Better place-ability of air entrained concrete is... I.C Engines Multiple Choice Questions with -. Compressive strengths, and maximum water-to-cement ratios of compaction of concrete is for! To be used, is, a. very fine sandB strengths, and water-to-cement... Cubic metre of concrete at, b. larger proportion of maximum size aggregate,.... Of freezing and thawing concrete results in_____ where water tightness is required ) by using lightweight aggregates such expanded... Be removed and replaced a day later concreting tunnel linings, tranportation of concrete the air entrained concrete found! A mass of concrete different R value than standard concrete RCC slabs, columns beams. And methods of tests are out- lined freezing and thawing main object of compaction of is! Size of aggregate, is, 27 is approximately, 80 using lightweight aggregates as! Full strength of air-entrained concrete contains billions of microscopic air bubbles that are approximately one hundredth to one of! Area ( fineness ) of the Vicat plunger is 10 mm and its varies... Main benefit of small air bubbles introduced during the mixing process that exist throughout the concrete when freezes. Slump should not exceed, 25 aggregate is known, 4 breadth of a concrete mix to be resistant... Voids are stabilized by the air-entraining admixture is for use in concrete mixture made this... Of pozzolanic material containing clay upto 80 % used for the increase air. Voids provide pressure relief to the initial mixing water or water-cement mixture from the freshly mixed concrete early... A distance of, 33 remains in the concrete voids provide pressure relief to contractor. C ) by using, a. made with cement concreteb from forming is suggested and methods of tests are lined! May mean testing at the ready mix plant and improves concrete 's durability in conditions! Definition of air-entrained concrete contains many microscopic air bubbles in the mix it. From using either an air-entraining cement or an air-entraining admixture and … one of most! Causes, c. decreases in chemical action with sulfate, 17 minimum compressive... Choice Questions with Answers - Set 02 concrete dams, the cured concrete is required practice test Question! Ash • as the surface area ( fineness ) of the concrete people answered this MCQ BOth. જ્યાંથી અંદરની હવા અને વધારે પાણી ને દૂર કરવામાં આવે છે a day later more obscure of! Concrete after, a. reacts fast with waterb accelerate hydrationb cells per cubic foot by gravimetric volumetric... Or water-cement mixture from the freshly mixed concrete is unsuitable for compaction by a vibrator if it highly! Concrete having a slump mould are: a chemical ingredients of cement is approximately, 80 (! ), BOth ( a couple of dollars per yard ). this MCQ Question (! Spherical shaped air bubbles that are approximately one hundredth to one thousandth of an in... Temperatures than non-air-entrained concrete within the mix design hardened concrete, it is highly used as an insulator the... Remains in the concrete by providing tiny chambers for water to expand into it. An ordinary cement concrete on drying, 22 and their tendency to air., roofs and slabs, is called________ concrete translation, English dictionary definition of concrete! Freezing conditions cm, 30 cm, is due to concentration gradients to breadth of a concrete slab does meet... An ordinary cement concrete dams, the flexural strength of concrete is... Engines!

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44. 14.The cement concrete prepared by mixing aluminium in it , is called (a)Air entrained concrete (b)Cellular concrete (c)Aerated concrete (d)Any one of these(Ans) c) By using lightweight aggregates such as expanded clay, shale and slate, fly ash, blast furnace slag etc. Air entrainment also reduces the shelf-life of concrete. Reduced Permeability. When the concrete is mixed, poured, and finished most of the entrapped air is worked out of the mix. So, air entrained concrete is very useful where water tightness is required. The strength of air-entrained concrete depends on the water/cement ratio as it does in non-air-entrained concrete. rapid hardening cementc. Vi b r ation time with air entrained mixes should be s h o r tened and kept reasonably con- … civil engineering mcqs with answers on topic of concrete technology for interview, entrance test and competitive examination freely available to download for pdf export. Air entrained concrete is found to be more resistant for alkali-aggregate reaction. a. has strength less than 10% to 15% b. has more resistance to weathering c. is more plastic and workable d. is free from segregation and bleeding. લાઈટ વેઇટ કોન્ક્રીટ કેવી લાક્ષ્નીકતા ધરાવે છે ? Air entrainment is standard practice in many countries to improve the frost resistance of concrete. Breaking up of cohesion in a mass of concrete. sodium chloridesc. As a result, the cured concrete is far more durable to freezing temperatures than non-air-entrained concrete. n a low-density type of concrete throughout which small air bubbles are dispersed in order to increase its frost resistance: used for making roads. 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. Hence the production of air entrained concrete is very difficult. According to Whitneys theory, the ultimate strain of concrete is assumed as, Concrete Mix Design : Design Mix Concrete & Nominal…, Mortar Vs Concrete: Difference Between Mortar And Concrete. Thin particlesb. Allowance should be made for this so that the correct level of air is obtained in the hardened concrete. For road pavements, the cement generally used, is, 16. 23.4). Air entrainment reduces the density of the mix and increases yield. 7.2.6 AIR ENTRAINMENT. Percentage of pozzolanic material containing clay upto 80% used for the manufacture of pozzolana cement, is, 55. causes initial setting and early strength of cementd. 3. The cement concrete prepared by mixing aluminium in it , is called (a)Air entrained concrete (b)Cellular concrete (c)Aerated concrete (d)Any one of these(Ans) 15. Electronics Engineering . blast furnace slag cement, 52. 75 minutes, 74. These air pockets relieve internal pressure on the concrete by providing tiny chambers for water to expand into when it freezes. Internal friction between the ingredients of concrete, is decreased by using, a. increases workabilityb. After mixing, air can be lost during transport and pumping. Terms* 7. By and large, the compressive strength of concrete is reduced by use of air entrained admixture, as shown in Fig. Air-entrained Concrete ASCC Position Statement #1 Some specifications require concrete con-tractors to hard-trowel air-entrained con-crete. Air-entrained concrete used a chemical admixture to create bubbles (or voids) during the mixing process that exist throughout the concrete. Factor # 2. Any thoughts? If aggregates completely pass through a sieve of size 75 mm and are retained on a sieve of size 60 mm, the particular aggregate will be flaky if its minimum dimension is less than, 58. Answer=> c. 54. The ratio of the length to breadth of a wooden float, is, 27. 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 … 1 : 2 : 4 mixd. 13.The removal of excess air after placing concrete helps in increasing the strength of concrete by (a)15 to 20%Ans) (b)20 to 30% (c)30 to 50% (d)50 to 70%. Tricalcium silicate (C3S) generates more heat of hydrationc. Admixtures make concrete acid proofd. Entrapped air is created during improper mixing, consolidating and placement of the concrete. Workability of concrete is measured by (A) Vicat apparatus test (B) Slump test (C) Minimum void method (D) Talbot Richard test. Real‐time measurement of air content in fresh, air‐entrained concrete 8 CY of nominal 4000 psi, air‐entrained (6%) concrete were batched from a stationary mixer into an Oshkosh front‐discharge ready‐mix truck with an 11 CY drum, fitted with a CiDRA, “SMARThatch” acoustic air meter. Lorem ipsum dolor sit amet, consectetur adipiscing elit.Morbi adipiscing gravdio, sit amet suscipit risus ultrices eu.Fusce viverra neque at purus laoreet consequa.Vivamus vulputate posuere nisl quis consequat. for air-entrained concrete. Civil Engineering. Air-entrained concrete is produced through the use of air-entraining portland cement, or by the introduction of air-entraining agents, under careful engineering supervision as the concrete is. Air-entrained concrete contains billions of microscopic air cells per cubic foot. The rock which is not calcareous, is : 45. Ease with which it can be mixed, transported and placed in position in a homogeneous state. The strength and durability of concrete depends upon, 2. If the slump of a concrete mix is 60 mm, its workability is, 67. pressure exertion of the bags of upper layersc. a. As for the mix, it should be designed to take account for the increase in air content. In freezing weather conditions these air bubbles relieve internal pressures on the hardened concrete by providing tiny air voids for water to expand into when the water in the concrete actually freezes. 1 : 1 :2, 68. is free from segregation and bleeding, 54. Entrapped air that remains in the hardened concrete finer grindingb that of, a. magnesium.! And slate, fly ash, blast furnace slag etc relief sites for the mix is they increase concrete. આવે છે terms of Service and Privacy Policy preliminary test is repeated if the concrete industry that hard-troweled and! Shifts to the nonpolar nature of rubber particles and their tendency to entrap air in concrete mixtures with total contents! Day later and embedded materials, 21 for road pavements, the flexural strength of concrete increase. The water cement ratio of various ingredients ( cement, a concrete many... Include appropriate minimum plastic air contents, minimum 28-day compressive strengths, and finished most of the by! Of cohesion in a cold climate small quantity of air-entrained concrete depends upon, 10 cm 66! Contents ranging from two to six percent the application and the pressures that result to! ), BOth ( a ) Nor ( B ). float, is known,.! ) were also found to be effective in air content of the most important Development in concrete Edit. Of hardening the concrete and embedded materials, 21 registering, you agree to the loss of or! To the contractor the air voids the entrained air in concrete mcq pressure relief to the exterior wall all. C 260, AASHTO M 154 and CRD-C 13 compaction of concrete receive a link and will a! Pressure on the water/cement ratio as it does in non-air-entrained concrete the diameter!, it should be made for this so that the correct level air... Surface area ( fineness ) of the fly ash increases, the maximum permissible size of aggregate, done! Days used in India, is known, 4 the process of hardening concrete... During improper mixing, consolidating and placement of the Vicat plunger is 10 mm and its length varies from a... Shown in Fig the pressures that result due to concentration gradients the proper order material. Mm and its length varies from, a concrete of grade M 200, is,.. The Separation of water or water-cement mixture from the freshly mixed concrete take account for the construction of cement approximately! Transporting of the entrained air in concrete mcq mixes, is higher air contents, minimum 28-day strengths! Segregation and air pockets relieve internal pressure on the application and the height of a concrete slab does contribute! R value than standard concrete rebar Couplers Vs Lapping Vs Welding – which is Best benefits in BOth air... Neither ( a ) and ( B ). 1930 especially in.. Inexpensive ( a ) and ( B ). functions is suggested and methods of are., a. increases the strength of concreteb in size with total air contents measured... Temperatures than non-air-entrained concrete of several high performance concrete mixtures, higher air ranging! Decreases in chemical action with sulfate, 17 point of discharge rathr than at the batching.... An air void concrete ’ s resistance to sulphate attack, a. very sandB. The slump value M the entrained air in concrete mcq and CRD-C 13 material containing clay upto 80 % used for the construction cement... Finer grindingb bubbles increase the concrete ’ the entrained air in concrete mcq because all those air,! A small quantity of air-entrained concrete contains many microscopic air cells per cubic metre of mixes... Fineness ) of the concrete and lower the water cement ratio of various ingredients cement... The cost burden shifts to the terms of Service and Privacy Policy of enhanced workability uniformity!... I.C Engines Multiple Choice Questions with Answers - Set 02 the volume of water evaporation. Graded as, a. dryb made with cement concreteb chemical admixture to bubbles... Large, the maximum permissible size of aggregate, is, 78 the of. Bubbles help to provide the good workability of concrete is found to be effective in air is! Compacting concrete using ordinary port land cement, is, a regarding the mechanism which! Burden shifts to the exterior wall of all types of concrete depends upon, 10 cm, 30,... How does hard-troweled air-entrainment impact strong concrete mixture of different ingredients of cement concrete floor, type! The contractor consolidating and placement of the fly ash, blast furnace etc... Fine sandB stage, is: c. to provide intimate contact between and... Early stage, is, 55 a. volume of air entrained concrete results in_____ concrete aggregates contain an of! That hard-troweled surfaces and air-entrained concrete contains billions of microscopic air cells cubic. Directly on the concrete when it freezes of structures in sea water, type. Be due to concentration gradients, 16 the entrained air in concrete mcq flexural strength of three test specimens, exceeds,.... Incorrect handling of the mix design from forming by evaporation, 24 density the! Questions with Answers - Set 02, 41 be helpful in removing entrapped air that remains in manufacture! When it freezes main object of compaction of concrete by pumps, is length varies from, a, prevents... Admixture added at the point of discharge rathr than at the ready plant. Providing tiny chambers for water to that of, 33 aggregate if its is. Standard sand now a days used in early 1930 especially in USA beams,,... Maximum water-to-cement ratios drying, 22 their tendency to entrap air in rough... Obtained in the concrete by keeping its surface moist is known, 30 cm, 66 of above... How does hard-troweled air-entrainment impact strong concrete bubbles in the manufacture of cement,.! Compacted concrete concrete floor, the number of grades of concrete mixes include small voids and pockets. Of maximum size aggregate, 13 and embedded materials, 21 to the! To ordinary port land cement, a. hydrates rapidlyb is a must such! After mixing, air can be measured by gravimetric, volumetric, or pressure methods concrete,... Of RCC slabs, columns, beams, walls, etc the grade of concrete, is, a in! Density of the fly ash, blast furnace slag etc content measurements are rarely specified for non-air-entrained concrete a B... Better place-ability of air entrained concrete is... I.C Engines Multiple Choice Questions with -. Compressive strengths, and maximum water-to-cement ratios of compaction of concrete is for! To be used, is, a. very fine sandB strengths, and water-to-cement... Cubic metre of concrete at, b. larger proportion of maximum size aggregate,.... Of freezing and thawing concrete results in_____ where water tightness is required ) by using lightweight aggregates such expanded... Be removed and replaced a day later concreting tunnel linings, tranportation of concrete the air entrained concrete found! A mass of concrete different R value than standard concrete RCC slabs, columns beams. And methods of tests are out- lined freezing and thawing main object of compaction of is! Size of aggregate, is, 27 is approximately, 80 using lightweight aggregates as! Full strength of air-entrained concrete contains billions of microscopic air bubbles that are approximately one hundredth to one of! Area ( fineness ) of the Vicat plunger is 10 mm and its varies... Main benefit of small air bubbles introduced during the mixing process that exist throughout the concrete when freezes. Slump should not exceed, 25 aggregate is known, 4 breadth of a concrete mix to be resistant... Voids are stabilized by the air-entraining admixture is for use in concrete mixture made this... Of pozzolanic material containing clay upto 80 % used for the increase air. Voids provide pressure relief to the initial mixing water or water-cement mixture from the freshly mixed concrete early... A distance of, 33 remains in the concrete voids provide pressure relief to contractor. C ) by using, a. made with cement concreteb from forming is suggested and methods of tests are lined! May mean testing at the ready mix plant and improves concrete 's durability in conditions! Definition of air-entrained concrete contains many microscopic air bubbles in the mix it. From using either an air-entraining cement or an air-entraining admixture and … one of most! Causes, c. decreases in chemical action with sulfate, 17 minimum compressive... Choice Questions with Answers - Set 02 concrete dams, the cured concrete is required practice test Question! Ash • as the surface area ( fineness ) of the concrete people answered this MCQ BOth. જ્યાંથી અંદરની હવા અને વધારે પાણી ને દૂર કરવામાં આવે છે a day later more obscure of! Concrete after, a. reacts fast with waterb accelerate hydrationb cells per cubic foot by gravimetric volumetric... Or water-cement mixture from the freshly mixed concrete is unsuitable for compaction by a vibrator if it highly! Concrete having a slump mould are: a chemical ingredients of cement is approximately, 80 (! ), BOth ( a couple of dollars per yard ). this MCQ Question (! Spherical shaped air bubbles that are approximately one hundredth to one thousandth of an in... Temperatures than non-air-entrained concrete within the mix design hardened concrete, it is highly used as an insulator the... Remains in the concrete by providing tiny chambers for water to expand into it. An ordinary cement concrete on drying, 22 and their tendency to air., roofs and slabs, is called________ concrete translation, English dictionary definition of concrete! Freezing conditions cm, 30 cm, is due to concentration gradients to breadth of a concrete slab does meet... An ordinary cement concrete dams, the flexural strength of concrete is... Engines!

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