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(a) Calcite on the surface of the crack healed in 40 °C (EXP 9, SEM SE image 150×), (b) calcite inside the crack (Cross-section 1) healed in 40 °C (EXP 9, SEM BSE image 800×), (c) Ettringite on the surface of the crack healed in 5 °C (EXP 10, SEM SE image 200×), and (d) Ettringite on the surface of the crack healed in 5 °C (EXP 10, SEM SE image 200×).
