Cement, Mortar And Lime - 3


20 Questions MCQ Test Topicwise Question Bank for GATE Civil Engineering | Cement, Mortar And Lime - 3


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QUESTION: 1

Surkhi is added to lime mortar to

Solution:
QUESTION: 2

Increase in fineness of cement

Solution:

The fineness of cement is a measure of the size of particles of cement and is expressed in terms of specific surface of cement.
For a given weight of cement, the surface area is more for finer cement than for coarser cement. The finer the cement, the higher is the rate of hydration, as more surface area is available for chemical reaction. This results in the early development of strength.

QUESTION: 3

Consider the following statements:
The effect of air entrainment in concrete is to
1. increase resistance to freezing and thawing
2. improve workability
3. decrease strength
Which of these statements are correct?

Solution:

Air entrainment will reduce damage during freeze- thaw cycles thereby increasing the concrete’s durability. 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. The compounds used for air-entrainment are a number ofaetural wood resins, various sulphonated compounds, and some animal and vegetable fats and oils such as tallow, olive oil and their fatty acids such as stearic and oleic acids.

QUESTION: 4

Match List-I (Property of cement) with List-ll (Testing apparatus) and select the correct answer using the codes give below the lists:

Codes:

Solution:
QUESTION: 5

Consider the following statements: High early strength of cement is obtained as a result of
1. fine grinding
2. decreasing the lime content
3. burning at higher temperatures
4. increasing the quantity of gypsum
Which of these statements are correct

Solution:

On increasing fineness setting time decreases. So early gain of strength with decrease in lime content quick setting takes place.
On increasing Gypsum Initial setting time increases.

QUESTION: 6

Match List-I with List-ll and select the correct answer using the codes given below the lists:

Codes:

Solution:
QUESTION: 7

Match List-I (Type of cement) with List-ll (Characteristics) and select the correct answer using the codes given below the lists:

Codes:

Solution:
QUESTION: 8

Match List-I (Apparatus) with List-ll (Purpose) and select the correct answer using the code given below the lists:

Codes:

Solution:
QUESTION: 9

Match List-I (Type of Cement) with List-ll (Characteristics) and select the correct answer using the code given below the lists:

Codes:

Solution:
QUESTION: 10

Consider the following statements: Low percentage of C3S and high percentage of C2S in cement will result in
1. higher ultimate strength with less heat generation
2. rapid-hardening
3. better resistance to chemical attack
Which of these statements are correct?

Solution:
QUESTION: 11

Consider the following statements:
"When cement is tested /for setting time; on gauging it shows quick setting. This phenomenon known as "Flash set" of cement is due to the presence of high 
1. Tricalcium Aluminate (C3A) in cement
2. Alkalies in cement .
3. Tricalcium Silicate (C3S) in cement.
Which of these statements are correct?

Solution:
QUESTION: 12

Match List-I (Cement) with List-lI (Characteristic) and select the correct answer using the codes given below the lists:

Codes:

Solution:
QUESTION: 13

Consider the following statements:
1. Addition of a small quantity of slaked lime to Portland cement in cement mortar increases the plasticity of the mortar.
2. Light weight mortar is prepared by mixing cement and finely crushed fire bricks with water,
3. Fire resistant mortar is prepared by mixing aluminous cement and finely ground china clay wares with water.
Which of these statements are correct?

Solution:
QUESTION: 14

Lime mortar is generally made with

Solution:

Lime used for mortar may be fat lime (quick or hydrated lime) or hydraulic lime. Slaked fat lime is used to prepare mortar for plastering, while hydraulic lime is used in preparing mortar for masonry construction.

QUESTION: 15

The temperature range in a cement kiln is

Solution:
QUESTION: 16

Which type of following cement is used for mass concrete work 

Solution:

Low-heat Portland Cement: This cement is less reactive than OPC and is obtained by increasing the proportion of C2S and reducing that of C3S and C3A  this is achieved by restricting the amount of calcium and increasing that of silicates in the raw material for manufacture. This reduction in the contents of more rapidly hydrating compounds C3S and C3A results in a slow development of strength but the ultimate strength is the same. The initial setting time is about one hour, i.e., greater than that of OPC, and final setting time is about 0 hours. This cement is recommended for the use in mass concrete construction such as retaining walls, bridge piers and abutments, dams, etc., where temperature rise by heat of hydration can become excessive.

QUESTION: 17

Low heat cement contains lower percentage of which of the following

Solution:
QUESTION: 18

Specific surface of portland cement should not be less than

Solution:
QUESTION: 19

Loss on ignition in portland cement shall not be more than

Solution:

The loss on ignition test is carried on portland cement to determine the loss of weight when the sample is heated to 900-1000°C. The loss is weight occurs as the moisture and carbon dioxide which are present is combination with free lime or magnesia evaporate.
The loss on ignition is determined by heating one gram of cement sample is a platinum crucible at a temperature of 900°C-1000°C for minimum of 15 minutes. Normally, the loss, will be in the neighbourhood of two percent.
Maximum allowable loss is four percent.

QUESTION: 20

Which of the following is correct if they are arranged in decreasing order of heat of hydration

Solution:

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