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Effect of Silica Fume Addition on the Durability of Alkali-Resistant Glass Fibrer in Cement Matrices

The durability of alkali-resistant glass fiber in cement matrices with and without silica fume was investigated. Several attack modes such as hydroxylation, mass dissolution and notching by calcium hydroxide crystals were distinguished. The effect of silica fume addition was found to be slight; it greatly reduced the calcium hydroxide content of the cement matrix and inhibited notching attack but it did not reduce the internal pH sufficiently to inhibit hydroxylation and mass dissolution.