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Introduction to Concrete
Cement Strength Tests and Standards
Description
Cement strength is measured with standard tests that use mortar, not neat cement paste. Cement paste alone is hard to shape into specimens that give consistent and reliable results. For that reason, the test samples are usually made with cement and sand.
For compressive strength, ASTM C 109-05 us...
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Transcript
水泥抵抗压力的能力称为其抗压强度,而其承受弯曲力的能力则称为抗折强度。
按所需比例取水泥、标准砂和水,混合制成水泥砂浆。
将该砂浆浇铸成一个2英寸的立方体试样,以及一个尺寸为1.5 × 1.57 × 6.3英寸的梁状试样。
这些样品将在潮湿环境中养护,直至可以脱模。
脱模后的试件需在石灰水中继续养护,直至进行测试。试件通常在养护1天、3天、7天和28天后进行测试。
测试过程包括将用于抗压试验的立方体和用于抗折试验的梁放入机器中,并持续增加荷载,直至试样破坏。
试样破坏时的荷载用于计算水泥砂浆的抗压强度和抗折强度。
最后,所用水泥的类型对水泥砂浆的抗压强度有显著影响。
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