lesson 10

What is the key determinant of concrete strength according to the text?

• Air content

• Water-cement ratio

• Mix water requirements

• Aggregate size

What is the primary factor that influences freeze-thaw damage in concrete?

• Concrete pore structure

• Number of freeze-thaw cycles

• Air void system in concrete

• Concrete permeability

What is the primary reason for pop-out damage in concrete?

• Sulfate attack

• Frost expansion of coarse aggregate

• D-cracking

• Scaling

Which property of hardened concrete is affected by the formation of ettringite and gypsum?

• Tensile Strength

• Permeability

• Absorption

• Compressive Strength

What is the primary method used to measure the open porosity of concrete?

• Chloride Permeability Test

• D-Cracking Test

• Surface Absorption Test

• Water Permeability Test

What is the primary factor that can reduce sulfate attack in concrete?

• Cement with high C3A content

• High w/c ratio

• Poor compaction

• Mineral admixtures like fly ash

What is the primary reason for scaling damage in concrete?

• Expansion of frost-susceptible aggregates

• Low porosity

• Poor curing

• High tensile strength

What is the primary method used to measure the splitting tensile strength of concrete?

• Splitting Tension Test

• Compressive Strength Test

• Flexural Strength Test

• D-Cracking Test

What is the primary method used to apply heat for accelerating strength gain in concrete?

• Curing Compound

• Steam

• Water Ponding

• Wet Sand