Materials

Question 1

Name three things that can help create a strong concrete beam

Answer 1

1. install rebar or fiber reinforcement
2. Include fly ash as an admixture along with cement, fine and coarse aggregates
3. Using high strength cement

Question 2

When compared to a low water-to-cement ratio concrete, a high water-to-cement ratio concrete is?

Answer 2

weaker, as water to cement ratio increases, strength decreases

Question 3

what is RQD

Answer 3

percentage of toatl core run length consisting of pieces greater than 4 inches,

Question 4

what type of cement should be specified for the batch mix-design for a project that has a high sulfate resistance

Answer 4

type V type 5

Question 5

what test methods can be used to identify potential internal defects

Answer 5

Impact-echo, ultrasonic echo and Impulse response

Question 6

how does increasing water - cement ratio affect slump?

Answer 6

increased slump, when wc increases the workability(slump).

not all water is consumed during the cemener hydration, the final concrete product will have a high porosity

Question 7

how does increasing water - cement ratio affect porosity of concrete product?

Answer 7

not all water is consumed during the cemener hydration, the final concrete product will have a high porosity

Question 8

how does concrete porosity affect the strength of the concrete

Answer 8

more porosity produces less strong concrete

Question 9

what impact does water-cement ratio have on air content?

Answer 9

No impact

Question 10

what is the swell factor?

Answer 10

loose unit weight divided by the bank unit weight

Question 11

How does water - to cement ratio affect permability?

Answer 11

High water to cement ratio is more permeable

Question 12

How does high water to cement ratio affect shrinkage?

Answer 12

more water more shrinkage

Question 13

For a Concrete mix problem about yeild of concrete in ft^3, how many pounds do you account for Air

Answer 13

Zero, do not add weight for air

Question 14

With Casgrande’s cup method, how is liquid limit defined

Answer 14

it is defined as the water content as which the grove cut into the soil will close over a distance of 12.5 mm following 25 blows

Question 15

what soil has the greatest volume, loose soil , compacted or bank soil?

Answer 15

loose soil l has the greatest volume

Question 16

what soil has the smallest volume, loose soil , compacted or bank soil?

Answer 16

Compacted

Question 17

what is the equation for Compacted Cubic yard or CCY?

Answer 17

CCY = BCY(bank cubic yard) X shrinkage factor

Question 18

Deformation of soil are a function of?

Answer 18

Effective stress, total stresses, pore water pressure

Based on the principal of effective stress, effective stress equals total stress minus pore water pressure. IT is the ,post important principal in soil mechanics

Question 19

What is swell factor?

Answer 19

is the loose unit weight divided by the bank unit weight

Question 20

Name two geosynthetics used for soil stabilization?

Answer 20

Geotextiles and GEogrids

Question 21

Name two geosynthetics used for soil stabilization?

Answer 21

Geotextiles and Geogrids

Question 22

what are Geonets used for?

Answer 22

drainage purposes

Question 23

what are Geomembranes used for?

Answer 23

as a liner or a barrier to control fluid penetration

Question 24

What should a concrete mix consist of if it needs to be 3,500 psi, completed duting and 8 -hour window at night, where temperated are average 50 Degrees F

Answer 24

an early strength concrete, Type III cement and chemical accelerators

Question 25

what is type I Cement

Question 26

what is type II Cement

Question 27

what is type III cement?

Question 28

what is type IV cement?

Question 29

what is type V cement?

Answer 29

sulfate-resistant

Question 30

Fatigue in steel can be the result of ?

Answer 30

a reduction in strength due to cyclical loads

Question 31

what is Sheet erosion

Question 32

What is Rill Erosion

Question 33

What is Gully erosion

Question 34

summarize the 5 types of cement

Answer 34

ordinary (Type I),
modified (Type II),
high-early-strength (Type III),
low-heat (Type IV), and
sulfate-resistant (Type V)

Question 35

what is type 2 cement and when should it be used

Answer 35

this is the modified version of type1 when is between 1 and the sulfate resistance type V

• where soil contains only moderate amounts of sulfade
• roadways and transportation

Question 36

what is type 3 cement and when should it be used

Answer 36

this is the early strength concrete

perfect for cold weather ( that affects how quickly concrete cures) also when quick turn a around is needed

Question 37

what is type 4 cement and when should it be used

Answer 37

Type IV cement generates less heat during hydration and curing than ordinary Type I portland cement.

When conducting mass pours or casting large-volume concrete products, Type IV cement is often used to lessen the amount of heat generated and reduce the risk of flash setting or thermal shock.

Type IV cement’s ability to generate less heat during hydration is also beneficial in hot weather concreting applications where fresh concrete may cure at an expedited rate due to high ambient temperatures.

Question 38

what is type 5 cement and when should it be used

Answer 38

Type V cement is used in concrete products where extreme sulfate resistance is necessary. Coastal structures, piers, underwater tunnels, submerged structures, foundations, roadways and transportation products are all common applications for Type V cement.