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The addition of 1–4% s/s (dry solids by mass of C3S) of afwillite (C3S2H3) seeds to C3S pastes made with two different commercial polyacrylate-based superplasticizers (SP) allows the pastes to be cast at low water/C3S mass ratios (w/c) and overcomes the hydration retardation produced by the SPs. SP-free C3S pastes seeded with afwillite at an initial w/c of 0.50 gave about 30% lower 28-day compressive...