Building Materials - Concrete Part 2

110問 • 1年前

問題一覧

Uses stone that is similar than conventional concrete and cement with detail or no sand in the mixture, this creates photo spaces that allows water to pass through. Uses for photos drainage pipes also casual possesses some insulating value.

Porous concrete (Pervious concrete)

it is a specific type of pavement with high porosity that allows rainwater to pass through into the ground below

Permeable pavement

what is concrete called when it is strengthened by embedded steel?

reinforced concrete

which type of cement is specifically mentioned as being used in application for alkaline water and soils are present

sulfate-resisting cement

Refers to placement by gravity feed from a hopper through a vertical pipe extending for above the surface to the underwater floor. As as concrete flows from the bottom of the pipe, more is added to the hopper so that the termite pipe is continuously charged with fresh milk. Used in placing concrete underwater.

Tremie concrete

A precast and cured hydrated cement concrete which has been impregnated with a flow viscosity monomer and polymerized in-situ. Used for surface impregnation of bridge decks, repair of structures, under the marine applications, application in irrigation structures best use in structural members.

Polymer-Impregnated concrete

Monomer are polymer is added to fresh mix concrete and subsequently allowed to cure; a composite concrete that consists of synthetic polymer within the binding material. Used for brick deck covering floor construction percuss construction and used as patching compounds

Polymer-Portland Cement Concrete (PPCC) or Polymer Cement Concrete (PCC) or Polymer Modified Concrete (PMC) or Latex- Modified Concrete (LMC)

Type of concrete that uses polymers to replace lime-type cements as a binder. Used for curtain and wall facing panel

Polymer concrete

Type of concrete where cement and water is not used instead melted sulphur which act as binding agent is used to bind the fine and coase aggregate and the filter material like fly ash together to form a hard concrete.

Sulphur concrete

Solidifies rapidly (one day) and has good hardening capabilities; strength similar to Portland cement. Used for industrial floors, bridge decks, leach tanks, sewer pipes

Sulphur concrete

Primary reinforcing may be bar or rods mats; plain or deformed bars

Reinforced concrete

A type of concrete that is reinforced with steel to resist tensile forces. It's used in construction for bridges, commercial spaces, and home features

Prestressed concrete

Section is placed in compression using pretensioned steel wires when used in plant

Pretensioned

Section is placed in compression using posttensioned cables after being cast in place

Posttensioned

How can you determine the strength and durability of concrete

water-cement ratio, cement-aggregate ratio, size of coarse. aggregates, ratio of fine aggregates to coarse aggregates, type of cement

What are the qualities of concrete required in both massive and reinforced construction are

That is shall be strong, Durable, Uniform quality, Thoroughly sound

Good quality concrete is obtained through:

Careful selection of materials, Correct proportioning, Thorough mixing, Careful transporting and placing, Proper curing or protection of the concrete after it is placed

In reinforced-concrete construction should be high-grade Type 1 Portland cement type C-150 conforming to the “Standard Specifications and Test for Portland Cement” of the American Society for Testing Materials (ASTM).

cement

What kind of test in cement usually made are

soundness, or constancy of volume, time setting, fineness, tensile strength

Inert mineral fillers used with cement and water in making concrete, should be particles that are durable strong, clean, hard and uncoated, and which are free from injurious amount of dusts, lumps, soft and flaky particles, shale, alkali, organic matter loam or other deleterious substances.

Aggregates

aggregates smaller than 6mm (¼”) in size) consist of sand, stone screenings or other inert materials of similar characteristics.

Fine aggregates

A fine aggregates that are the best, through sands from any durable rock are good

Siliceous quartz sand

Aggregate larger than ¼” in size consists of crushed stones, gravel or other inert materials of similar characteristics.

coarse aggregate

What is the smallest size of coarse aggregate recommended for reinforced concrete work

1/4 inch

What is the maximum recommended size of coarse aggregate for reinforced beams, floor slabs, and thin walls

1 inch

For less highly reinforced parts of structures such as footings and thick walls, the maximum aggregate size may be

2 inches

The portion of aggregate retained is specified on which sieve size?

No. 4 (4.8mm)

Which of the following is a natural lightweight aggregate formed by the sudden cooling of molten volcanic matter?

Pumice

Which lightweight aggregate consists of mica expanded by heat into wormlike threads

Vermiculite

What is Diatomite made from

Skeletons of tiny aquatic plants

Which of the following lightweight aggregates is used for fireproofing and plaster applications

Expanded Slate

Which of the following lightweight aggregates is obtained from the exfoliation of clay or shal

Expanded Shale

Which of the following are an examples of clay or shale aggregates

Airox, Rocklite, Haydite

Which of the following aggregates is primarily used in locations with harsh weather conditions due to its insulating and sound-absorptive properties

Pumice

Which of the following is are the classification of lightweight aggregates:

Aggregates of volcanic origin, Micaceous minerals, Diatomaceous earth and expanded shale

Which lightweight aggregate is used as a loose-fill thermal insulation material

Perlite

Which of the following aggregates is obtained from diatoms

Diatomite

Which lightweight aggregate is commonly used in precast slabs and blocks where maximum strength is required

Diatomite, Expanded Shale, Vermiculite

What is the standard sand motar ratio of cement for tensile strength

1:3

such as cinders, blast furnace slag, expanded shale or clay, perlite, vermiculite, and sawdust

special aggregates

Should be free from oil, acid, alkali, vegetable matter, or other deleterious substances should be reasonably clear and clean.

water

What is the average amount of water (in gallons) used for ordinary job conditions

6.5 gallons

What is the maximum water-cement ratio in U.S. gallons per sack for a compressive strength of 2,000 psi

7.00

What is the maximum water-cement ratio in U.S. gallons per sack for a compressive strength of 2,500 psi

6.50

What is the maximum water-cement ratio in U.S. gallons per sack for a compressive strength of 3,750 psi

5.00

What is the maximum water-cement ratio in U.S. gallons per sack for a compressive strength of 3,000 psi

5.75

For a compressive strength of 2,500 psi, how many pounds of water are used per 100 lbs. of cement

57.5

For a compressive strength of 2,000 psi, how many pounds of water are used per 100 lbs. of cement

62.0

For a compressive strength of 3,000 psi, how many pounds of water are used per 100 lbs. of cement

51.0

For a compressive strength of 3,750 psi, how many pounds of water are used per 100 lbs. of cement

44.5

find aggregates are defined as two smaller than

6 mm (1/4")

The consistency of the concrete mix is determined using

slump test

Used for measuring consistency of the concrete mix

slump test

What is the diameter of bottom opening of metal cone (apparatuse use in slump test)

8" (200 mm)

What is the diameter of top opening of metal cone (apparatuse use in slump test)

4" (100 mm)

What is the diameter of height of metal cone (apparatuse use in slump test)

12" (300 mm)

What is the diameter of the rod used for tamping the concrete

12mm (½")

Name the kind of slump

true slump

Name the kind of slump

shear slump

Name the kind of slump

collapse slump

What is the consistency slump pavements and floor laid on ground: maximum:________ minimum:________

75 mm (3"), 25 mm (1")

What is the consistency slump plain footings, caissons, and substructure walls: maximum:________ minimum:________

100 mm (4"), 25 mm (1")

What is the consistency slump heavy mass construction: maximum:________ minimum:________

75 mm (3"), 25 mm (1")

What is the consistency slump slabs, beams, thin reinforced wall and building columns maximum:________ minimum:________

150 mm (6"), 75 mm (3")

What is the consistency slump plain footings, caissons, and substructure walls: maximum:________ minimum:________

100 mm (4"), 25 mm (1")

What is the consistency slump reinforced foundation walls and footing: maximum:________ minimum:________

125mm (5"), 50mm (2")

Which of the following is not a method of concrete proportioning

Proportioning by compressive strength and air content

The economy of a concrete mix is larger determined by

Proper proportioning of fine and coarse aggregate

The strength of a workable concrete mix primary depends on

water-cement ratio

The ideal concrete mix should be

workable, not harsh

When adding aggregates the concrete mix what should be considered

add the correct portion of aggregates to achieve the desired consistency

Should be free from oil, acid, alkali, vegetable matter, other deleterious substance and should be reasonably clean and clear.

water

Using special aggregates like siders plus fernace slug, expanded shale or clay can result in what type of concrete

lightweight, nailing concrete and insulating concrete

the water cement ratio refers to

The amount of water used per bag of cement

Select all the steps involved in proportioning concrete by the water-ratio and slump test

Select the amount of water to be added to the cement to achieve the desired strength, Add just enough mixed aggregate to the water and cement to achieve the desired consistency, Specify the proportions in terms of: Cement in sacks, Water in gallons per sack of cement, Mixed aggregate in cubic feet per sack of cement, Optionally specify the proportions of cement to fine aggregate to coarse aggregate if needed

This method is the same as the second except that the proportions of the fine and coarse aggregate are determined by the fineness modulus method.

Proportioning by water-ratio, slump and fineness modulus

What concrete class is recommended for concrete underwater, retaining wall and elevator shear wall

Class AA

What concrete class is recommended for concrete subject for post-tensioning or pre-tensioning dams and similar use

Class AAA

What concrete class is recommended for concrete floor slabs, beams, columns, arches, machine/ engine foundation and building foundation

Class A

What concrete class uses for slabs on fill, retaining wall, abutment piers, building wall and sidewalk

Class B

What concrete class uses for stone masonry and filling, parapet walls, plant-boxes

Class C

What concrete class uses the highest ratio of coarse aggregate to the cement and fine aggregate. For footpath, walkway and lean concrete.

Class D

What is the required strength for Class AAA

4,500 psi

What is the required strength for Class AA

4,000 psi

What is the required strength for Class A

3,500 psi

What is the required strength for Class B

3,000 psi

What is the required strength for Class C

2,500 psi

What is the required strength for Class D

2,000 psi

What is the ratio of Class AAA

1:1:2

What is the ratio of Class AA

1:1.5:3

What is the ratio of Class A

1:2:4

What is the ratio of Class B

1:2.5:5

What is the ratio of Class C

1:3:6

What is the ratio of Class D

1:3.5:7

Is a type of mixing done on a water tight form, initially set of concrete takes place 1 -3 hours after mixing, a batch maybe used anytime before initial set takes place provided that the mix is plastic

hand mixing

The most common type of concrete mixer

drum mixer

Into which what the materials are fed constantly and from which the concrete is discharged in steady stream

continuous mixer

lnto which sufficient materials are placed at one time to make a convenient size batch of concrete, the whole amount being discharged in one mass after it is mixed.

batch mixers

What are classified as concrete mixer

drum mixers, trough mixers, gravity mixers, pneumatic mixers

100

A manual method of mixing concrete done on watertight platform

hand mixing

Building laws Part 1

Mari Alberca · 100問 · 1年前

Building laws Part 1