15 Questions
What are the basic thermal properties of concrete?
Thermal conductivity and diffusivity, specific heat, coefficient of thermal expansion
How can the wear resistance of concrete be improved?
Using lower water-cement ratio, lowest slump, good quality graded aggregate, etc.
How is the bond strength between steel reinforcement and concrete determined?
By pullout tests - load required to cause a slip of 0.25mm divided by the area of contact
What factors affect the modulus of elasticity of concrete?
Strength, water-cement ratio, moisture content, quality of aggregate, age of the structure
What is the function of porosity in determining the permeability of concrete?
Porosity affects the size and continuity of pores, influencing permeability
Which curing method is suitable when early strength gain in concrete is required?
Steam curing
What can be applied to concrete surfaces to reduce moisture loss during curing?
Liquid membrane-forming compounds
How can precast concrete sections be cured for strength development?
Using electrical curing techniques
What method can be used to apply heat during cold weather for concrete curing?
Electrically heated blankets
When can steam curing be used to cure concrete?
When early strength gain is required
What should be done to concrete when the temperature goes below freezing?
Insulate with dry, porous material like hay or straw
Which of the following is NOT a consideration for determining the curing period of concrete?
Color of concrete
What is a suitable method for insulating concrete when the temperature falls below freezing?
Layering with dry, porous materials like hay or straw
Which technique can be used to apply additional heat during the curing of concrete in cold weather?
Electrical curing techniques
What type of material can be used to reduce moisture loss on a concrete surface during curing?
Liquid membrane-forming compounds
Test your knowledge on factors that affect the permeability of concrete, compressive strength tests, and other essential topics related to testing hardened concrete specimens.
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