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SEM images of fibrous-like and flower-like crystals in the cement paste with 0.25% bwoc GONSs: (a) a cluster of fibrous crystals found in the pore; (b) the local amplification for the area with the white box marked in image (a); (c) some flower-like crystals observed on the surface; and (d) the local amplification for the area with white box marked in the image (c).
