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(A) Compressive strength for all the samples aged 28 days (lines are drawn for eye help only). SEM observation of fresh fractured surfaces from samples with finer grain size: 37–53 µm (B) GP/WG 60%, (C) GP/WG 20% (BSE, 800×), (D) GP/WG 60% with coarse gain size (BSE 800×).
