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Questions and Answers
What is the purpose of adding water-reducing admixtures to reinforced concrete?
What is the purpose of adding water-reducing admixtures to reinforced concrete?
- To enhance frost resistance
- To increase strength
- To reduce impermeability
- To improve workability (correct)
Which type of admixture improves workability, impermeability, and frost resistance but reduces strength?
Which type of admixture improves workability, impermeability, and frost resistance but reduces strength?
- Set retarder
- Hardening accelerator
- Water-reducing admixture
- Air entraining admixture (correct)
What do anti-freeze and rust-resistant agents do in reinforced concrete?
What do anti-freeze and rust-resistant agents do in reinforced concrete?
- Reduce liquid freezing point and corrosion to steel bars, respectively
- Increase liquid freezing point and protect steel bars from corrosion, respectively
- Increase liquid freezing point and corrosion to steel bars, respectively
- Reduce liquid freezing point and protect steel bars from corrosion, respectively (correct)
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Study Notes
- Reinforced concrete is a composite material made of concrete and steel.
- Glass fiber or polypropylene can also be used in specialized applications.
- Concrete admixture is added to improve performance.
- Water-reducing admixtures can be ordinary, effective, hardening, retarder, or air entraining.
- Air entraining admixture improves workability, impermeability, and frost resistance but reduces strength.
- Hardening accelerator accelerates early strength development and can be inorganic, organic, or inorganic-organic compound.
- Set retarder delays setting time and common types include calcium lignosulfonate and molasses.
- Flash setting admixture promotes rapid hardening.
- Expansion agent produces shrinkage compensating or micro-expansion.
- Anti-freeze and rust-resistant agents reduce liquid freezing point and corrosion to steel bars, respectively.
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