Unit 6

Question 1

_________ is one of the most widely used materials of construction.

Answer 1

Steel

Question 2

Steel combines such characteristics as strength, fabricability, and cheapness.

Answer 2

T

Question 3

The ______________________ requires the use of only the structural and intermediate grades, although studies abroad tend to show that hard steel such as rail steel gives satisfactory service performance.

Answer 3

Department of Public Works and Highways Standard Specification

Question 4

The ___________ is used primarily to control the cracking of a concrete structure and to maintain the structural integrity of the slab between transverse joints.

Answer 4

steel reinforcing

Question 5

The amount of ____ in steel is a critical quantity since, while small amount of small percentage (0.5 to 0.10%) the phosphorus called “______” a term applied to that characteristic of steel, which makes it brittle when cold.

Answer 5

phosphorus, cold shortness

Question 6

_________ shall be deformed bars.

Answer 6

Tie bars

Question 7

_______ shall be plain round bars.

Answer 7

Dowels

Question 8

steel bar with protrusions, a bar that is intended for use as reinforcement in reinforced concrete construction.

Answer 8

Deformed bar

Question 9

steel bar without protrusions

Answer 9

Plain bar

Question 10

longitudinal protrusions on a deformed bar

Answer 10

Rib

Question 11

The ability of a material to withstand a pulling (tensile force). It is customarily measured in units of force per cross sectional area.

Answer 11

Tensile strength

Question 12

The stress a material can withstand without permanent deformation

Answer 12

Yield strength

Question 13

The maximum stress a material can withstand

Answer 13

Ultimate strength

Question 14

The stress coordinate on the stress strain curve at the point of rupture

Answer 14

Breaking strength

Question 15

A limit state of tensile stress that leads to tensile failure in one of 2 manners:

Answer 15

Tensile strength
Ductile, Brittle failure