【Daily Question】Utilities – Civil Engineering – 20190413

2019-04-13View Original

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If the compressive strength of a standard concrete specimen after 28 days is 23 MPa, then its strength grade should be designated as (　　). A、C20 B、C23 C、C25 D、C30 【Answer】A 【Explanation】The strength grade of concrete is determined based on the compressive strength of specimens with a volume of 150 mm³, measured after 28 days of curing under standard conditions (20±3°C, relative humidity greater than 90%). There are 10 such grades in total. If the measured compressive strength value falls between two grades, it shall be classified according to the lower grade. The value of 23 MPa for this question falls within the range of 20–25 MPa, so it should be classified as C20 grade.

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【Daily Question】Utilities – Civil Engineering – 20190413

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