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Concrete Technology MCQs with Answers & Solutions — Page 3 | Civexa

Subjects / Concrete Technology / MCQs

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Concrete Technology MCQs with answers

176 free questions — page 3 of 4. Open one to see the correct answer and the full solution.

The compressive strength of concrete is tested on cubes of sizeStrength of Concrete
In a split tensile test, the load is appliedStrength of Concrete
As per IS code, the initial setting time of OPC should not be less than ___________and final setting time should not exceed________.Cement Testing
Coefficient of permeability for a concrete sample with cross-sectional area 100 cm2 , thickness 20 cm, drop in hydraulic head 2 cm and rate of flow…Durability of Concrete
Which of these is not a workability test for concrete?Strength of Concrete
Which of the instruments is needed for testing the fineness of the cement?Cement Testing
M20 grade of concrete has the following proportion of the ingredients of cement, sand and coarse aggregates.Concrete Mix Design
The maximum bulking of sand is likely to occur at a moisture content ofAggregates
Which method of curing of concrete is preferable for rapid gain of strength of concrete?Strength of Concrete
Which property of fly ash improves the workability of fresh concrete?Admixtures
For high-strength concrete and to mitigate alkali-silica reaction, which class of fly ash is preferred?Admixtures
Water-reducing admixtures (plasticizers) are classified asAdmixtures
For concreting in hot weather (high ambient temperature) to prevent rapid setting and cracking, which admixture is selected?Extreme Weather Concreting
Based on particle size, aggregates are classified as fine and coarse. The standard dividing sieve size isAggregates
For producing high-strength concrete (M60 and above), which type of coarse aggregate is preferred?Aggregates
When fly ash is used as a partial replacement for ordinary portland cement in concrete, it chemically reacts with Calcium Hydroxide (Ca(OH)2). What…Admixtures
Which of the following best describes the principle behind the Blaine Air Permeability test used for cement?Cement Testing
Which of the following statement(s) is/are true regarding water-cement ratio? (i) Lower water-cement ratio increases the strength of concrete. (ii)…Concrete Mix Design
Which of the following statement(s) is/are true regarding Vee-Bee consistometer test? (i) It is suitable for very dry concrete mixes. (ii) It…Concrete Mix Design
In hot weather concreting, which of the following is a recommended practice to prevent ‘plastic shrinkage cracking’?Extreme Weather Concreting
Why rich concrete mixes exhibit lower permeability?Durability of Concrete
Which of the following statement(s) is/are true regarding maximum aggregate size in mix design? (i) Larger aggregate size reduces cement requirement.…Aggregates
Which of the following statement(s) is/are true regarding factor of safety in mix design? (i) It accounts for variability in material properties.…Concrete Mix Design
In the Vicat apparatus test for setting time of cement, the initial set is said to have occurred whenCement Testing
For a concrete mix intended for a high rise building column, which workability test is most suitable and why?Concrete Mix Design
The term ‘characteristic strength’ of concrete refers toStrength of Concrete
Which IS code is commonly used for concrete mix design in India?Concrete Mix Design
Which of the following combinations is most critical for achieving both high flow ability and segregation resistance in Self-Compacting Concrete…Special Concretes
Air-entraining agents improve concrete byAdmixtures
During a hot summer pour, a concrete mix starts setting too quickly before finishing. Which of the following is the most effective corrective action?Extreme Weather Concreting
A precast factory wants to achieve rapid early strength for quick panel removal. Which combination is most suitable?Admixtures
A project in winter has ambient temperatures around – 5°C. Which measure is most critical to ensure early strength and prevent freezing?Extreme Weather Concreting
Consider the following statements regarding calcined clay : 1. Its chief function is to impart strength and hydraulic properties of mortar. 2. It is…Admixtures
What are the concrete stages production order respectively ?Concrete Mix Design
Consider the following statements regarding the functions of admixtures : 1. It is to speed up the rate of development of strength at early ages. 2.…Admixtures
Consider the following statements regarding the concrete mix design : 1. It is to be compressive with strength of standard test specimens. 2. It is…Concrete Mix Design
Consider the following statements regarding the design requirements of concrete mix : 1. Grade of concrete : M20, M25 connotes the characteristic…Concrete Mix Design
In the conveying of most building concrete from the mixer or truck to the form is done in bottom-dump buckets, then the chief danger during conveying…Concrete Mix Design
Which one of the following is NOT a property of an admixture ?Admixtures
What is the proportion of acid and alkalis permitted in the water used in construction ?Concrete Mix Design
For a reinforced concrete structure, subjected to freezing and thawing cycles, the most critical property of the aggregate isDurability of Concrete
Q.16 Which of the following compounds is responsible for slow hardening, less heat of hydration, and greater resistance to the chemical attack in OPC…Bogue's Compounds
Q.30 Which of the following test apparatus is used to determine initial setting time and final setting time?Cement Testing
Q.75 Which of the following accelerating admixtures is harmful for reinforced concrete and pre-stressed concrete?Admixtures
Q.88 Proper experimental knowledge about the porosity and water absorption capacity of a coarse aggregate is required as its affects the durability…Aggregates
Q.91 As a precaution in cold weather concreting, cement containing _______ should be selected.Extreme Weather Concreting
Q.93 Which of the following is NOT a retarding admixture?Admixtures
As per IS 2386 (1963), the aggregate crushing value is calculated by using a single sized aggregate, which is:Aggregates
Blaine air permeability apparatus is used to determine the _______ of Portland cement.Cement Testing
Which of the following statements is INCORRECT?Strength of Concrete

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