Early-Age Hydration Reaction and Strength Formation Mechanism of Solid Waste Silica Fume Modified Concrete.

The area of peak 1 shows an increasing trend with more water is adsorbed, indicating that water in the concrete mainly exists in the adsorbed form.

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The area of peak 3 presents a decreasing trend, indicating that the free water in the concrete decreases with the rise of silica fume replacement amount. 3.3.2.

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With the increase in the replacement amount of silica fume, the slump of fresh concrete gradually decreased, and the air content showed a trend of first decreasing and then increasing.

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