Deck 12: The Development of Mortar

Question 1

Which of the following statements is true regarding water used in mortar?

A) It should be high in alkalis but low in salts.
B) It should be high in both salts and acids.
C) Purifying chemicals in city water supplies have an adverse effect on mortar.
D) Water fit to drink is acceptable for use in mortar.

Answer 1

D

Question 2

Good quality sand is available in only one type: manufactured.

Answer 2

False

Question 3

Which of the following statements is true about sand?

A) Manufactured sand is smoother than natural sand.
B) Natural sand has a sharp, angular grain shape.
C) Natural sand is rounder than manufactured sand.
D) Manufactured sand is very high in salt content.

Answer 3

C

Question 4

The ability of mortar to reknit or reseal itself if hairline cracks occur is called _____ .

A) flexibility
B) autogenous healing
C) compressive strength
D) adhesion

Question 5

The production of portland cement involves only one simple process.

Question 6

_____ portland cement is used in masonry when moderate sulfate resistance or moderate heat of hydration is desired.

A) Type A
B) Type B
C) Type I
D) Type II

Question 7

ASTM C1329 applies to ______, a hydraulic cement similar with the added requirement of meeting a minimum bond strength.

A) blended hydraulic cement
B) mortar cement
C) masonry cement
D) portland cement

Question 8

Clay was the first material to be used for mortar.

Question 9

ASTM C150 covers _____ types of portland cement, but only _____ are recommended for use in masonry mortars.

A) four; two
B) five; four
C) seven; five
D) eight; three

Question 10

A _____ will usually be classified as Type M, Type S, or Type N.

A) blended hydraulic cement
B) mortar cement
C) masonry cement
D) portland cement

Question 11

Portland cement is a _____ cement, which means that it sets and hardens by a chemical reaction with water.

A) hydraulic
B) natural
C) hydrated
D) lime-sand

Question 12

_____ is formed by calcining pieces of limestone under controlled heat.

A) Slaked lime
B) Quicklime
C) Hydrated lime
D) Hydraulic lime

Question 13

Mortar performance is greatly influenced by the choice and amount of cement materials in the mix.

Question 14

Lime-based mortar is high in _____, which means that the mortar resists drying effects when combined with the masonry Chapters to build a wall.

A) water retentivity
B) bond strength
C) workability
D) tensile strength

Question 15

Although not as strong as previous cements, portland cement is less expensive and therefore more widely used.