Question 1

Explain the difference between normal- weight (NW)and lightweight (LW)coarse aggregate.

Accepted Answer

NW coarse aggregate is made from crushin

Question 2

High- strength concrete is defined as concrete whose compressive strength is greater than or equal to

Accepted Answer

A) 4,000 psi. 
B) 8,000 psi. 
C) 5,000 psi. 
D) 10,000 psi. 
E) 6,000 psi. 
A) 4,000 psi. 
B) 8,000 psi. 
C) 5,000 psi. 
D) 10,000 psi. 
E) 6,000 psi.

Question 3

How does fly ash work as partial replacement for Portland cement (PC)in concrete?

Accepted Answer

The two main ingredients in the manufact

Question 4

Give the chemical composition of limestone.

Accepted Answer

The answer of Give the chemical composition of limestone....

Question 5

Portland cement (PC)is made in five types: Types I, II, III, IV, and V. Which of these is high- early strength PC and which is the general purpose PC?

Accepted Answer

Type III is high- ea

Question 6

What is a No. 4 sieve? A No. 50 sieve?

Accepted Answer

A sieve is a screened pan used to sift p

Question 7

The test specimen used for determining the compressive strength of concrete in the United States is a

Accepted Answer

A) 6- in.- diameter, 12- in.- high cone. 
B) 6- in.- diameter, 18- in.- high cylinder. 
C) 6- in.- diameter, 12- in.- high cylinder. 
D) 6- in.- diameter, 6- in.- high cylinder. 
A) 6- in.- diameter, 12- in.- high cone. 
B) 6- in.- diameter, 18- in.- high cylinder. 
C) 6- in.- diameter, 12- in.- high cylinder. 
D) 6- in.- diameter, 6- in.- high cylinder.

Question 8

Why is the setting and hardening of lime mortar a slow process?

Accepted Answer

The setting and hardening of lime mortar

Question 9

Which type of Portland cement is commonly used in making precast concrete members?

Accepted Answer

A) Type III 
B) Type II/III 
C) Type I/II 
D) Type C 
E) Type pC1 
A) Type III 
B) Type II/III 
C) Type I/II 
D) Type C 
E) Type pC1

Question 10

List various types of Portland cement and where they are typically specified.

Accepted Answer

There are several types of Portland ceme

Question 11

Explain the difference between air entrainment and air entrapment in concrete.

Accepted Answer

Air entrainment is a deliberate process

Question 12

The minimum water- cement ratio for complete hydration of Portland cement is approximately 0.4. However, we generally need a larger w- c ratio in concrete mixes. Why is that so, and what is the effect of
greater- than- minimum w- c ratio?

Accepted Answer

A w- c ratio > 0.4 is required

Question 13

The finishing operations of a concrete surface usually involve striking, floating, and troweling. The sequence in which these three operations are generally performed is

Accepted Answer

A) striking, troweling, and floating. 
B) troweling, floating, and striking. 
C) striking, floating, and troweling. 
D) floating, striking, and troweling. 
A) striking, troweling, and floating. 
B) troweling, floating, and striking. 
C) striking, floating, and troweling. 
D) floating, striking, and troweling.

Question 14

Describe how lime- sand mortar hardens and functions as cement.

Accepted Answer

Lime-sand mortar hardens through a proce

Question 15

What is a water- reducing agent (WRA)and what is its function?

Accepted Answer

A WRA is a concrete admixture that is ad

Question 16

In a high- rise building, the concrete may be brought from the ground to the location of placement by

Accepted Answer

A) chutes. 
B) buckets. 
C) pumping. 
D) A or B. 
E) B or C. 
A) chutes. 
B) buckets. 
C) pumping. 
D) A or B. 
E) B or C.

Question 17

Quicklime is most commonly used in building construction.

Accepted Answer

A) True 
 B)False

Question 18

Define: (i)concrete and (ii)concrete admixture.

Accepted Answer

Concrete consists of four ingredients: (

Question 19

After how many days of casting concrete in test cylinders, are they broken to determine the strength of concrete?

Accepted Answer

The answer of After how many days of casting concrete...

Question 20

Hydrated lime- water paste sets and hardens due to the

Accepted Answer

A) chemical reaction of water in lime with carbon dioxide in air. 
B) chemical reaction of water with lime. 
C) chemical reaction of oxygen in air with lime. 
D) chemical reaction of nitrogen in air with lime. 
E) chemical reaction of carbon dioxide in air with lime. 
A) chemical reaction of water in lime with carbon dioxide in air. 
B) chemical reaction of water with lime. 
C) chemical reaction of oxygen in air with lime. 
D) chemical reaction of nitrogen in air with lime. 
E) chemical reaction of carbon dioxide in air with lime.

Exam 21: Lime, Portland Cement, and Concrete

Explain the difference between normal- weight (NW)and lightweight (LW)coarse aggregate.

High- strength concrete is defined as concrete whose compressive strength is greater than or equal to

How does fly ash work as partial replacement for Portland cement (PC)in concrete?

Give the chemical composition of limestone.

Portland cement (PC)is made in five types: Types I, II, III, IV, and V. Which of these is high- early strength PC and which is the general purpose PC?

What is a No. 4 sieve? A No. 50 sieve?

The test specimen used for determining the compressive strength of concrete in the United States is a

Why is the setting and hardening of lime mortar a slow process?

Which type of Portland cement is commonly used in making precast concrete members?

List various types of Portland cement and where they are typically specified.

Explain the difference between air entrainment and air entrapment in concrete.

The minimum water- cement ratio for complete hydration of Portland cement is approximately 0.4. However, we generally need a larger w- c ratio in concrete mixes. Why is that so, and what is the effect of greater- than- minimum w- c ratio?

The finishing operations of a concrete surface usually involve striking, floating, and troweling. The sequence in which these three operations are generally performed is

Describe how lime- sand mortar hardens and functions as cement.

What is a water- reducing agent (WRA)and what is its function?

In a high- rise building, the concrete may be brought from the ground to the location of placement by

Quicklime is most commonly used in building construction.

Define: (i)concrete and (ii)concrete admixture.

After how many days of casting concrete in test cylinders, are they broken to determine the strength of concrete?

Hydrated lime- water paste sets and hardens due to the

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