Intro to Construction Materials Midterm

The typical proper slump for a rammed earth mix is 0" 1" - 2" 3" - 4"

0"

A #8 reinforcing bar has a diameter of... 1/8 in. 8 in. 1 in. none of the above

1 in

For most of the United States, the basic wind speed for design is 70 mph 90 mph 140 mph 115 mph

115 mph

A square specimen measuring 12" x 12" in cross section carries a load of 18 kips. What is the stress in the material? 18 kips 18 ksi 2.25 ksi 125 psi

125psi

The yield strength of prestressing steel is 20 ksi 50 ksi 100 ksi 270 ksi

270KSI

The compressive strength of concrete is generally measured... 28 days after casting the concrete test specimen 7 days after casting the concrete test specimen 14 days after casting the concrete test specimen when the concrete is fresh

28 days after casting the concrete test specimen

Steel reinforcement in concrete elements exposed to earth such as footings must have a minimum concrete cover of 5" 3" 1" No answer text provided.

3"

The time period used in BEES for determining the LCC of a product is 25 years 50 years 75 years 100 years

50

The element in concrete with the greatest embodied energy is Fine aggregate Coarse aggregate Cement

Cement

After concrete has been placed in the form, it should be compacted as much as economically practical. True False

False

Rammed earth construction requires electrical or pneumatic tamping techniques True False

False

Rammed earth exhibits both high thermal mass and insulation qualities. True False

False

A well-graded coarse aggregate is one in which the size of all aggregate particles is approximately the same True False

Fasle

Stirrups in a reinforced concrete beam are used to Increase its strength in bending Reduce its deflection Increase durability Increase strength in shear

Increase strength in shear

Stirrups are generally made of No. 3 or No. 4 bars No. 4, 5 or 6 bars No. 6 or 7 bars Any diameter, as needed

No. 3 or No. 4 bars

Quicklime reacts readily with water True False

True

The rate at which concrete gains strength increases as the ambient air temperature increases. True False

True

The term "prestressed concrete" refers to both pretensioned and post-tensioned concrete. True False

True

The most commonly specified type of portland cement is Type C Type III Type PC1 Type I/II

Type I/II

One of the major US organizations that deals with sustainable architectural design is the USEBC USFBC USGBC USHBC

USGBC

Which of the following materials is most renewable? Steel Aluminum Natural stone Wood

Wood

Which gives greater warning before failure? a brittle material a ductile material

a ductile material

The author S. Dobson cites the following obstacle to greater acceptance of rammed earth in the US: trust in the material successful examples of built structures cost competitiveness all of the above

all of the above

The design snow load on a roof is a function of roof slope ground snow load of the location all of the above wind exposure classification of that site

all of the above

By weight, which of the following materials has the highest embodied energy when made from virgin raw materials? steel aluminum natural stone wood lumber

aluminum

Horizontal blocking for wood studs helps prevent compressive failure of studs shear failure of studs tensile failure of studs buckling of studs

buckling of studs

What makes Stabilized Rammed Earth stabilized? crushed stone cementitious ingredients lime

cementitious ingredients

The bearing strength of a material is closely related to its bending strength tensile strength compressive strength modulus of elasticity

compressive strength

Which of the following loads can be estimated with the greatest certainty? earthquake loads wind loads snow loads dead loads

dead loads

According to building codes, plain concrete (without steel reinforcement) is not permitted in new construction true false

false

Which of the following materials is a pozzolana? portland cement lime fly ash sand

fly ash

On a leeward wall, the wind pressure is constant with height above the ground (dependent on other factors) increases with height above the ground decreases with height above the ground

is constant with height above the ground (dependent on other factors)

Which of the following occupancies has the highest floor live load? library reading rooms hotel guest rooms classrooms offices library stack rooms

library stack rooms

Modulus of Elasticity refers to how... strong a material is stiff a material is serviceable a material is none of the above

stiff a material is

The distinction between coarse aggregate and fine aggregate is based on the aggregate's strength the aggregate's surface texture the aggregate's density the aggregate's particle size

the aggregate's particle size

The primary purpose of longitudinal steel bars in a reinforced concrete beam is to overcome the weakness of concrete in tension. True False

true

The stress-strain diagram of mild steel is nearly a straight line up to the yield point. True False

true

The slump of concrete is a measure of the... modulus of elasticity of concrete tensile strength of concrete workability of concrete compressive strength of concrete

workability of concrete

When a cable or rope is compressed by a force, what is the compressive stress in it? equal to the force applied force divided by the cross-sectional area of the rope zero infinite

zero