Mechanical Properties of Concrete: Compressive Strength Quiz

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What are the two types of reinforcing bars mentioned in the text?

Plain Reinforcing Bar and Deformed Reinforcing Bar

What is the color code for Grade 33 reinforcing bars?

White

What is the yield strength of Grade 50 reinforcing bars in MPa?

345 MPa

What is the ultimate strength of Grade 60 reinforcing bars in psi?

60,000 psi Signup and view all the answers

What color code is used for Grade 230 (33) non-weldable deformed bars?

White Signup and view all the answers

What are the welded wire fabric used for?

Pavements or slab-on-grades Signup and view all the answers

What is the American Size No. for rebar used in Girder/Beam/Column?

No. 5 Signup and view all the answers

What does the color Yellow represent in ASTM Grade 275 (40) rebar?

ASTM Grade 275 (40) Signup and view all the answers

Why are markings carved on steel bars?

To identify their classifications, strengths, and other details Signup and view all the answers

What are the typical uses of American Size No. 6 rebar?

Girder/Beam/Column Signup and view all the answers

What are the color codes for weldable deformed bars Grade 415 (60)?

Green / Red Signup and view all the answers

What is the design strategy adopted in Limit State Design?

Strength Design Signup and view all the answers

What is the main concern when considering the plastic limit in design?

Development of more cracks and deflection Signup and view all the answers

What does Serviceability in structural design include checking for?

Drifts, deflections, and crack widths Signup and view all the answers

What is another term used for Plastic Design?

Limit design or capacity design Signup and view all the answers

In Balanced Design, when do both the compressive and tensile zones reach yielding?

At the same imposed load on the beam Signup and view all the answers

What are under-reinforced sections in beam design?

Reinforced concrete beam sections in which steel reaches yield strain at loads lower than concrete failure strain Signup and view all the answers

What is the standard size of concrete cylinders used to test compressive strength?

150 mm diameter by 300 mm height (6”x12”) or 100 mm diameter by 200 mm height (4”x8”) Signup and view all the answers

What is the common compressive strength range of concrete typically used?

f’c = 2,500 psi (17 MPa) to f’c > 6,000 psi for high-strength concrete Signup and view all the answers

What is the relationship between flexural strength and compressive strength of concrete?

The flexural strength (fr) is only about 10% to 15% of the compressive strength of concrete (0.10f’c – 0.15f’c). Signup and view all the answers

What is another name for the Modulus of Rupture in concrete?

Flexural strength (fr) Signup and view all the answers

How are beam samples typically used to test flexural strength?

6”x6”x20” beam samples are used to test flexural strength. Signup and view all the answers

What type of concrete is characterized by a compressive strength greater than 6,000 psi?

High-strength concrete Signup and view all the answers

What must an engineer consider when designing structures?

All loads that might act simultaneously on the structure Signup and view all the answers

What is the purpose of load combinations in structural design?

To ensure the structure has adequate strength to resist the most unfavorable load combinations Signup and view all the answers

Besides strength requirements, what other requirements must a structure satisfy?

Serviceability requirements related to its intended use Signup and view all the answers

What are some examples of serviceability requirements for structures?

Deflections, vibrations, cracking, corrosion, and fatigue Signup and view all the answers

What are the commonly used load combinations in the design of structures according to NSCP 2001?

PU = 1.40 PDL + 1.70 PLL, MU = 1.40 MDL + 1.70 MLL Signup and view all the answers

What are the commonly used load combinations in the design of structures according to NSCP 2010/2015?

PU = 1.20 PDL + 1.60 PLL, MU = 1.20 MDL + 1.60 MLL Signup and view all the answers