Testing of Reinforcing Steel Bars

Sabrina Mikhaela Canindo · 42問 · 1年前

通報

問題一覧

A steel product of plain, round or deformed cross section for concrete reinforcement.

Bar

steel bar with protrusions.

Deformed Bar

bar that is intended for use as reinforcement in reinforced concrete construction.

Deformed Bar

transverse protrusions on a deformed bar.

Deformation

steel bar without protrusions.

Plain Bar

longitudinal protrusion on a deformed bar.

Rib

inhibits longitudinal movement of the bar relative to the concrete surrounding the bar in such construction.

Lugs or Protrusion

surface of which is provided with lugs or protrusions called deformation.

Deformed Steel Bar

used in reinforced concrete structures to provide a superior mechanical bond with concrete for increased tensile strength, seismic resistance, and durability.

Deformed Steel Bar

Suitable for less demanding construction projects.

Light Structures

Used for railings, gates, and other decorative metalwork.

Decorative Purposes

Applied in formwork and falsework where high bond strength isn't critical.

Temporary Structures

Used in some prestressed concrete applications for supporting bars.

Prestressed Concrete

provides less friction and a weaker bond with concrete.

Smooth Surface

without surface deformation.

Plain Steel Bar

Steel bar shall be graded according to its minimum yield strength.

Grade

Bars are of three minimum yield strength levels: namely:

280 MPa (40,000 psi), 420 MPa (60,000 psi), 520 MPa (75,000 psi)

HOW TO READ REBAR MARKINGS:

Main Ribs, Letter or Symbol for Production Mill, Bar Size, Type of Steel, Grade Mark

is very strong under compression (pushing force), but weak under tension (pulling force).

Concrete

is added to compensate for this weakness.

Reinforcement

is placed within the formwork in areas that will experience tensile or shearing stress once the concrete hardens and the structure is under load.

Rebar

Help distribute the heavy loads from traffic or equipment more evenly across the slab.

Rebars

Concrete is very strong under compression (pushing force), but weak under tension (pulling force). Reinforcement is added to compensate for this weakness. The rebar is placed within the formwork in areas that will experience tensile or shearing stress once the concrete hardens and the structure is under load.

Embedded in concrete for purpose of resisting particular stresses.

Providing internal tensile strength that resists the concrete's natural tendency to stretch and break.

Control cracking of concrete structure.

Rebars help distribute the heavy loads from traffic or equipment more evenly across the slab. Without the reinforcement, the load would create localized stresses that could cause the concrete to fail.

Maintain the structural integrity of the slab between transverse joints.

The combination of steel rebar and concrete creates a composite material that is robust under both compressive and tensile forces. The concrete takes on the compression, while the rebar absorbs the tension.

Prevents the progressive opening of cracks by holding the edges of the cracks closely together.

For Steel Bars: 1 QT for every __ or fraction thereof for each size.

10,000 kgs

For RCP: 1 QT for every __ or fraction thereof.

50 pcs

For CHB: 1 QT for every __ or fraction thereof.

10,000 units

A widely used formula for calculating the theoretical weight of a reinforcing bar is:

W=d²/162

Determines the tensile properties.

Tension Test

Results are used to classify bars into grades.

Tension Test

Provides information on the strength and ductility of materials under uniaxial tensile stresses.

Tension Test

Results may be useful in comparison of materials, alloy development and quality control.

Tension Test

Tension Tests:

Yield Point, Tensile Strength, Elongation

Calculate by dividing the load sustained by the specimen at the sudden halt of the load indicating pointer by the nominal cross-sectional area of the specimen.

Yield Point

Calculate by dividing the maximum load the specimen sustains during test by the nominal cross-sectional area of the specimen.

Tensile Strength

Express the increase in length of the gage length as a percentage of the original gage length.

Elongation

Length determination.

Dimensions

Weight determination.

Variation in Mass

bars are evaluated on the basis of nominal mass.

Weight Determination

Evaluates the ductile properties of reinforcing steel bar.

Bending Test

Evaluates the ductile properties of rebar.

Phosphorous Content Determination

Deformation Measurements (For deformed bar):

Average Spacing (spacing between the lugs), Average height (height of the lug), Gap (width of the rib)

No cracking on outside bent portion.

Bending Requirement

__ in Mass, % Shall not exceed __ maximum under nominal mass except for bars smaller than __ plain round. In no case shall the over weight be the cause for rejection.

Variation, 6%, ⅜in (10 mm)

is __ maximum.

Phosphorous Content, 0.06%

Enumeration

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(2)

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draw

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ttr

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g ycu

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5-8

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Chap 6

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chap9

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8,9

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Ident

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enu

enu

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officials

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events

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Enumeration

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1-5

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enu L1

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Obtaining Data

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