Plasticizers are sometimes used in mass concrete to lower the cement content and hydration heat. I.C Engines Multiple Choice Questions with Answers - Set 02. Sand requiring a high water cement ratio, belongs to: Options are : Zone IV . Important Point: Answer: False. As the hydration proceeds the deposits of hydrated products on the original cement grains makes the diffusion of water to unhydrated nucleus . Cement is a finely grinded power material, which can work as a binder when water is added to it. View Answer. For ordinary Portland cement (OPC), compressive strength is ranging between 33 - 53MPa at 28 days, 22- 27 MPa at 7days and 16 -27MPa at 3days of curing after casting. b) IS 901.1 sieve where at least 90% (by weight) should pass. These Civil Engineering MCQ Questions are selected supported by the newest exam pattern. Workability of concrete mix with low water cement ratio is determined by. c) 15%. Building Construction MCQs - Plain and Reinforced - Cement - 1. The diameter of the Vicat plunger is 10 mm and its length varies from. 8 - Question. Water/cement ratio can be expressed in terms of weight and volume too. Answer:- 1. Practice Test . Lime concrete in foundation or floor. MCQ on Metal Casting Processes Equipment 2. 8.50 cum. These Civil Engineering MCQ Questions are selected supported by the newest exam pattern. 7. (C) Compaction factor test. The aim of soil stabilization is to increase the shear streng and bearing capacity of the soil. Abram's s water/cement ratio law states that the strength of concrete is only dependent on the water/cement ratio provided the mix is workable. Concrete Technology Mcqs - MCQ Questions and Answers for interview, . A medium mix is used for foundations, walls, abutments, piers, etc. Option-1 : adding minimum quantiy of water to cement. The typical w/c ratio for different grades of concrete varies between 0.40 to 0.60. It is a mixture of different compounds consisting mainly of silicates and aluminates of calcium formed out of silica, calcium oxide, aluminum oxide, and iron oxide. Cement. Lean: 1 part cement, 3 parts sand, 6 parts coarse aggregate. MCQ on Production Process - I-----Module 1: ----- 1. Answer: (C) Compaction factor test. Concrete Technology MCQ Practice Questions (Civil Eng) Set 7. (D) 50 mm to 60 mm. The ratio of maximum daily demand to average demand is. An ideal ware . If the slump of a concrete mix is 60 mm, its workability is. Caesium hydroxide or cesium hydroxide (CsOH) is a chemical compound consisting of caesium ions and hydroxide ions. 11. The workability of concrete is defined as the. 12. Hydration is the collective term describing the chemical and physical processes that takes place between cement and water. a) 5%. Gypsum is added to Portland cement to accelerate its setting time. Manufacturing of cement: c) Hydraulic lime, sand, water. Correct Answer . If the Sugar dosage level is approximately 0.06% by weight of the cement then it increases the setting time up to 1.33 hrs. Flowing concrete is a highly fluid but workable concrete that can be placed with little or no vibration or . Gypsum is often added to Portland cement to prevent early hardening or "flash setting", allowing a longer working time. 10. 7. 250+ TOP MCQs on Hydration of Cement and Answers. In the case of lime-cement mortar, which component acts as predominant binding materials. a) 0.25. . Low heat cement is ideal for use in the construction of dams. 17. It is a strong base (p kb = -1.76), much like the other alkali metal hydroxides such as sodium hydroxide and potassium hydroxide. Answer: (A) A rich mix of concrete possesses higher strength than that a lean mix of desired workability with excessive quantity of water. Al 2 O 3, Fe 2 O 3, CaO, SiO 2. Water supply projects under normal circumstances are designed period of. c) 15 %. Lime concrete in roof terracing. . C : Chemical reaction of cement with base. When water add to cement CaSO4 react causes rapid setting. . A w/c ratio of 0.4 means that for every 100 lbs of cement used in the concrete, 40 lbs of water is added. More water should not be added in the concrete. A : Chemical reaction of cement with acid. Can concrete be mixed by hand? 11. Answer & Explanation Answer: D) Colored Cement Explanation: Colored cement is made by mixing 5-10% mineral pigments into Portland cement during the grinding process. When water is added to cement in concrete each of the major component of cement undergoes hydration reaction and contribute to the final product that is known as hydrates product. Correct Answer . Answer: False. Fire cement mortar Fire clay mortar All the above ⇒ Half turn stairs change their direction through 180° 160° 90° 45° ⇒ Plastic asphalt is. (B) 30 mm to 40 mm. There should not be any loss of cement from the charged drum of the mixer. Correct Answer . 10. For more knowledge, you can download this Android app. As the hydration proceeds the deposits of hydrated products on the original cement grains makes the diffusion of water to unhydrated nucleus _____ Q: In order to prevent this rapid reaction _______ is added to the clinker. Option-3 : limiting the quantiites of free lime and magensia in cement. Blistering. 6.00 cum. 14. a) Puzzolona is the oldest cement invented by Romans. of cement, fine aggregates and coarse aggregates respetively and W/C is the water cement ratio, the minimum quantity of water to be added to first batch, is obtained by the equation: . Q2. Note: As there is a slight increase (negligible) in concrete strength is observed because Concrete pumps required less amount of water compared to other concrete pouring techniques, thus decrease in water cement ratio will lead to increase in strength of concrete. Water repellent chemicals in hydrophobic cement. The initial Setting Time should not be less than 30 minutes for Ordinary Portland Cement. Show Answer. D : 2*t1 Q2. The typical water cement ratio for different grades of concrete varies between 0.40 to 0.60. 1. Stone arch work. Concrete is a composite material made by mixing different materials like cement, sand, aggregate & water with or without admixture.. As per IS : 459-1978, the concrete mixes are designated into 1. The s-Block Elements Class 11 MCQs Questions with Answers. 10% of water is added after placing the other ingredients in the drum (D) All the above. Sugar is one of the traditional retarding agents used in concrete. Lime . Option - c) 3) A . b) Cement, sand and water. Medium: 1 part cement, 2 1/2 parts sand, 5 parts coarse aggregate. a) 5 %. Initial Setting Time gives an idea about how fast cement can start losing its plasticity and the final setting time of cement gives an idea about how much Time cement takes to lose its full plasticity and gain some strength to resist pressure.. View Answer. b. 0.80 cum. Which one of the following indicates these numbers ? Ingredients added in cement to make it shinier These Civil Engineering MCQ Questions are selected supported by the newest exam pattern. It works is same as glue we use for sticking two objects together, but it . Are added to cement during construction, it prevents seepage, leakage and damp cause by capillary absorption of the moisture in cement, mortar and concrete. 2. Which one of the following indicates these numbers ? Its strength will decrease. Lime water contains Ca(OH)₂. All the above. D : Chemical reaction of cement with salt, and acid. Q1. The water need to be pure in order to prevent side reaction with some Alkalies present in polluted water. Identify the correct ascending order of their proportions in a typical composition of OPC. c) Chemical reaction of cement with base. b. 11. ⇒ The softest rock is. Initial Setting Time of Cement: It is the time elapsed between the moments that the water is added to . Q4. Dental Cements Dental Cements Dental Materials Dental Materials Mcqs for preparation. When cement is mixed with water, it becomes hard over a period of time. In the manufacture of possolana cement, the amount of pozzolana material added to ordinary Portland cement clinkers is about To perform the soundness test, the water is added to the cement at the rate of 0.72 P by weight of cement, where P is the percentage of water required for normal consistency paste. Show Answer. MCQ on Casting 1.Which of the following are typically made of sand, plaster, ceramics and similar materials and generally are mixed with various binders? Which glass ionomer cement develops early resistance to water intake on setting ? Answer. Bad storage: alkalis in cement react with carbon dioxide forming Alkali carbonate which 4. To render the concrete more water tight (D) To improve the workability of concrete mix. Answer: (B) 10 % . Cement extensively used for attachment of orthodontic brackets to teeth is. Ingredients added in concrete to make good workability ANS: a) Ingredients which are added to in cement before or after concrete mix 2. . Water / cement ratio. Its most common construction material is extensively used for . Building Mortars - MCQ. 13. more quantity of concrete per bag of cement will be produced. The voids formed will absorb water and make the concrete structure permeable. Building mortars are classified into 6 grades based on compressive strength. In case of hand mixing of concrete, the extra cement to be added is (A) 5 % (B) 10 % (C) 15 % (D) 20 %. Q1. Answer. In the order of decreasing rate are tetra-calcium alumino . 0.40 cum. Q3. 10. Cement MCQ Question 4 Detailed Solution Download Solution PDF When water is added to cement, heat is generated as an end product. These Civil Engineering MCQ Questions are selected supported by the newest exam pattern. d) None of these. Superplasticizers, also known as plasticizers or high-range water reducers (HRWR), reduce water content by 12 to 30 percent and can be added to concrete with a low-to-normal slump and water-cement ratio to make high-slump flowing concrete. In lower surface of stones in which they rest is known as. 2. A : t2-t1. d) Puzzolona is quite setting cement and posses relatively low strength. (B) Slump test. The w/c ratio directly affects the strength of the concrete mix. If 1500 g of water is required to have a cement paste 1875 g of normal consistency, the percentage of water is, (A) 20 % . A phenomenon commonly observed in river sands for which adequate precautions need to be taken estimating, measuring and receiving sands at constructions sites is. 9. Sulpho-aminate is added in expanding cement. Gypsum loses all its water of crystallization at about a) 50° C.b) 100° C.c) 200° C.d) 300° C. View Answer b) 100° C. Gypsum loses all its The quantity of water proofing compound to be added is also very small, set 2% and does a bag of cement will require only about 10 N of such compounds. b) 10 %. The grade of concrete M 150 means that compressive strength of a 15 cm cube after 28 days, is: Options are : 200 kg/cm^ (2) 250 kg/cm^ (2) 150 kg/cm^ (2) 100 kg/cm^ (2) 300 kg/cm^ (2) Answer : 150 kg/cm^ (2) Hydraulics MCQ Practice Questions (Civil Engineering) Set 4. For a given aggregate content, increasing the water-cement ratio in concrete. Make Concrete Without a Mixer A cement mixer does a great job at mixing concrete, thoroughly blending the materials to give a consistent result. On an average, 23% or water by weight of cement is required for complete hydration to take place. Mcq Added by: admin. c) Puzzolona was used in making concrete for the construction of walls and domes. (c) separation of water or water-cement mixture from the freshly mixed concrete. 6. It is an exothermic reaction heat, which is a reaction that emits heat. The quantity of cement required for stabilization increases as soil plasticity increases. . d) Average. d) 20%. Q3. Setting and hardening of cement is due to hydration and hydrolysis. 8. Que 28. 28. Concrete Technology and Design MCQ with detailed explanation for interview, entrance and competitive exams. Metal stearates (Ca, Al, etc) are added in small percentage during grinding to get water proof cement. M20). The cement required for sandy soils range between 5 and 12% by weight. These Mcqs are helpful for Medical students. all of these: Answer: Option C . less quantity of concrete per bag of cement will be produced. As the hydration proceeds the deposits of hydrated products on the original cement grains makes the diffusion of water to unhydrated nucleus ________. The chemical change that occurs is non-reversible which is why we find it very difficult to reuse cement and concrete. 3. c) Very easy. So it is very important for you to understand it properly. Initial and Final Setting Time Of Cement Test. . Gypsum slows down the setting of cement so that cement is adequately hardened. Physics Chemistry. marble diamond talc quartz. Answer . Water cement ratio is generally expressed in volume of water required per (A) 10 kg (B) 20 kg . Ashlars masonry in lime or cement mortar. Al 2 O 3, Fe 2 O 3, CaO, SiO 2. 1.Heat is absorbed, 2.Heat is generated, 3.All impurities are washed out Answer: d Explanation: Tricalcium aluminate is the quickest to react with water when the water is added to the cement. 1.00 cum. 8. 9. To increase the capillary flow of water through concrete and to increase its durability [C]. a. Silicate cement. d. 127. Practice Test: Question Set - 02 1. . Water cement ratio Is the ratio of the mass of water to the mass of cement added to concrete. I.C Engines Multiple Choice Questions with Answers - Set 02. Gypsum loses all its water of crystallization at about a) 50° C.b) 100° C.c) 200° C.d) 300° C. View Answer b) 100° C. Gypsum loses all its In mass concreting works (dam) heat will be high and effect the stability of a structure. fine aggregates and coarse aggregates respectively and W/C is the water cement ratio, the minimum quantity of water to be added to first batch, is obtained by the equation . Four main oxides present in ordinary Portland cement are CaO, Al 2 O 3, SiO 2 and Fe 2 O 3. b) Natural puzzolona is deposit of volcanic ash. d) 9 grades. Pick up the correct statement from the following: Q2. Select the incorrect statement from the following options. Building Materials Civil Engineering MCQ Questions Answers . When sugar is added to the concrete, it acts as a retarding agent, and it delays the setting time of concrete. (D) Flexural strength test. . Option-2 : maximum quantiy of water to cement. a . Concrete Technology Setting Time Test; Question: If t1=Time at which water is first added to cement, t2=Time when needle fails to penetrate 5 mm to 7 mm from bottom of the mould, t3=Time when the needle makes an impression but the attachment fails to do so, then what is initial setting time?
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