Therefore, with the increase in fly ash content, the bending strength of ECC specimens shows an increasing trend, and the bending toughness is constantly improved.
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Durability Performance Investigation for Engineering Fiber Cementitious Composites (ECC): Review.
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The sentences
The test found that the strength of the material showed a trend of rising and then decreasing.
They concluded that with the growth of age, the number and volume rate of open holes in concrete significantly decreased, and the number of closed holes increased sharply, resulting in a decreasing trend of tensile strength at 28d.