The suspension was subjected _____ four cycles of freezing and thawing and was further disrupted _____ sonication (40 s).
The suspension was subjected _____ four cycles of freezing and thawing and was further disrupted _____ sonication (40 s).
Which of the following does not belong to concrete durability.（） A: resistance to freezing and thawing B: thermal shock resistance C: chloride resistance D: chemical resistance
Which of the following does not belong to concrete durability.（） A: resistance to freezing and thawing B: thermal shock resistance C: chloride resistance D: chemical resistance
Which of the following temperature is better for cell thawing after cryopreservation? A: 37℃ B: 4℃ C: -196℃ D: -20℃ E: -80℃ F: Room temperature.
Which of the following temperature is better for cell thawing after cryopreservation? A: 37℃ B: 4℃ C: -196℃ D: -20℃ E: -80℃ F: Room temperature.
An Iowa paving project requires a water-to-cement ratio (w/c) of 0.45 in concrete due to exposure (freezing and thawing) condition, 0.50 due to sulfate content in soil and ground water, and 0.40 due to the concrete strength requirement. What should be the controlling w/c of the designed concrete? A: 0.45 B: 0.50 C: 0.40 D: 0.48
An Iowa paving project requires a water-to-cement ratio (w/c) of 0.45 in concrete due to exposure (freezing and thawing) condition, 0.50 due to sulfate content in soil and ground water, and 0.40 due to the concrete strength requirement. What should be the controlling w/c of the designed concrete? A: 0.45 B: 0.50 C: 0.40 D: 0.48