Concrete Technology MCQs with Answers & Solutions

If in a concrete mix the fineness modulus of coarse aggregate is 7.6, the fineness modulus of the fine aggregate is 2.8 and the economical value of…Aggregates

Gypsum is used as an admixture in cement grouts forAdmixtures

Before testing the setting time of cement one should test forCement Testing

A splitting tensile test is performed on a cylinder of diameter D and length L. If the ultimate load is P, then splitting tensile strength of the…Strength of Concrete

Strength of concrete shows an increase with _________.Strength of Concrete

Match List-I (Aggregate) with List-II (Effect) and select the correct answer using the codes given below the lists. List-I List-II a. Rounded…Aggregates

Which one of the following is the working principle of concrete hammer for non-destructive test based?Non-Destructive Testing

The mix design for pavement concrete is based onConcrete Mix Design

Consider the following statements: Shrinkage of concrete depends upon the 1. Relative humidity of the atmosphere 2. Passage of time 3. Applied stress…Shrinkage of Concrete

Assertion (A): For identical mix, the cube compressive strength of concrete obtained from 15 cm cube is higher than 15×30 cm cylinder compressive…Strength of Concrete

What is the volume of concrete mix produced, if a batch type concrete mixer of 1500 litres capacity takes an effective time of 15 seconds for one…Concrete Mixers

Regarding Bogue’s compounds in portland cement, which of the following statements is correct regarding their contribution to strength and heat of…Bogue's Compounds

The Alkali-Aggregate Reaction (AAR) in concrete is a deleterious chemical process. Which of the following conditions is NOT a prerequisite for this…Durability of Concrete

Which of the following is a primary characteristic of "Self-Healing Concrete"?Special Concretes

In Concrete Mix Design, the term "Bulking of Sand" refers toAggregates

In Concrete Mix Design, the Target Mean Strength fck' is calculated as fck + 1.65σ. The factor 1.65 ensures thatConcrete Mix Design

When performing Ultrasonic Pulse Velocity (UPV) testing to assess concrete quality, which of the following factors would result in a "higher" pulse…Non-Destructive Testing

High-Performance Concrete (HPC) often utilizes Silica Fume (Micro-silica) to achieve high strength. This is primarily due toSpecial Concretes

Generally, as the water-cement ratio in a concrete mix increases, the strength of the concreteStrength of Concrete

Ultra-High Performance Concrete (UHPC) is characterized bySpecial Concretes

Consider the following statements regarding Extreme Weather Concreting 1. In hot weather, the high rate of evaporation can lead to plastic shrinkage…Extreme Weather Concreting

Assertion (A): High-strength concrete mixes often utilize Fly Ash as a partial replacement for cement. Reason (R): Fly Ash improves the workability…Admixtures

What is the most common problem faced in cold weather concreting?Extreme Weather Concreting

Which one of the following statements is correct regarding the factors influencing strength of concrete ?Strength of Concrete

The cement content in a mix design is 378 kg/m³, water content 170 kg, sand is 30% of total aggregate, entrapped air is 1%, specific gravity of…Concrete Mix Design

If the standard deviation is 4 N/mm² and the desired characteristic strength is 20 N/mm², what is the mean strength of concrete ?Concrete Mix Design

For a concrete mix design, an estimation of water content corresponds toConcrete Mix Design

For maximum strength, the desired workability of fresh concrete can be attained by which one of the following measures?Concrete Mix Design

Sugar added to cement mortarAdmixtures

If the standard deviation is 4 N/mm², then the mean strength of M20 concrete should beConcrete Mix Design

Which property of aggregates is tested using the Los Angeles abrasion test?Aggregates

Which test is used to measure the toughness of aggregates?Aggregates

Which test is conducted to check the resistance of aggregates to weathering?Aggregates

What is the role of bacteria in bio-concrete?Special Concretes

Why does the stress-strain curve of concrete exhibit a non-linear response even at low stress levels?Strength of Concrete

In the context of aggregates, the term "flakiness index" refers toAggregates

Pozzolanic materials react with which component of cement paste to form additional cementitious compounds?Admixtures

What is the typical pH value of fresh concrete?Durability of Concrete

In the context of tensile strength, which of the following statements about concrete is correct?Strength of Concrete

Retarding admixtures are commonly used in which of the following situations?Admixtures

The primary cause of reinforcement corrosion in concrete isDurability of Concrete

The use of calcium chloride as an accelerating admixture is generally avoided inAdmixtures

For a concrete mix with a characteristic strength of M40, if the standard deviation of compressive strength is 5 MPa, then what should be the target…Concrete Mix Design

Which of the following statements is correct for Ferrocement water tanks? i. In India, Ferrocement water tanks are permitted for a capacity up to…Special Concretes

Which of the following is a correct combination for admixture and its purpose as mentioned below? Type of Admixture: a. Plasticizer b. Air Entrainer…Admixtures

Which of the following is a correct combination for the concrete mix vs mix design mentioned in column A and B respectively? Column A: a. M10 b. M20…Concrete Mix Design

Which of the following is a correct combination for the concrete tests vs mechanical properties to be determined as mentioned below? Concrete Test:…Strength of Concrete

In order to prevent Alkali-aggregate reaction, low alkali cement can be used, in such a case what is the maximum permissible percentage of fly ash…Durability of Concrete

Which of the following statement(s) is/are correct? i. Higher Vee-Bee time shows lower workability ii. Higher slump shows higher workability iii.…Concrete Mix Design

Shrinkage of concrete depends on i. Humidity of atmosphere ii. Passage of time iii. StressShrinkage of Concrete