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A platform for research: civil engineering, architecture and urbanism
Shrinkage and sorptivity of mortars with thermoactivated recycled cement
Highlights The sorptivity and drying shrinkage of mortars with recycled cement (RC) was studied. Sorptivity of RC mortars was governed by the interparticle water/binder ratio (w/b). Reducing the source material’s w/c improved drying shrinkage but worsened sorptivity. RC obtained following a patented procedure performed almost similarly to pure RC. For up to 15% RC, the studied properties were not considerably affected.
Abstract This study aims to characterise the shrinkage and sorptivity behaviour of mortars produced with thermally activated recycled cement (RC) sourced from reference waste cement paste (RCP) or from the cementitious fraction of old concrete (RCC), the latter following a new patented method. Ordinary Portland Cement (OPC) was replaced with 5–100% RC, in mortars of similar consistency or equal water/binder (w/b). The influence of RC particle size and source material composition were also assessed. Moreover, selected mortars were produced with partial incorporation of fly ash to explore the high alkalinity of RC. Compared to OPC mortars of equal w/b, the compressive strength was not significantly altered for up to 15% RCP and reduced less than 25% for up to 100% RCP. For similar flowability, the water absorption and shrinkage were higher in RC mortars, following the necessary increase of the w/b. However, for fixed w/b, RC mortars presented a more refined interparticle porosity, and the coefficient of absorption decreased with RC content. Shrinkage consistently increased with RC content due to the refined interparticle microstructure, higher water demand and lower particle hardness of RC. Nevertheless, the 90 days shrinkage increased less than 17% for up to 50% RCP. Overall, RC's high potential was shown as an active supplementary cementitious material, with a negligible influence on shrinkage for up to 50% replacement.
Shrinkage and sorptivity of mortars with thermoactivated recycled cement
Highlights The sorptivity and drying shrinkage of mortars with recycled cement (RC) was studied. Sorptivity of RC mortars was governed by the interparticle water/binder ratio (w/b). Reducing the source material’s w/c improved drying shrinkage but worsened sorptivity. RC obtained following a patented procedure performed almost similarly to pure RC. For up to 15% RC, the studied properties were not considerably affected.
Abstract This study aims to characterise the shrinkage and sorptivity behaviour of mortars produced with thermally activated recycled cement (RC) sourced from reference waste cement paste (RCP) or from the cementitious fraction of old concrete (RCC), the latter following a new patented method. Ordinary Portland Cement (OPC) was replaced with 5–100% RC, in mortars of similar consistency or equal water/binder (w/b). The influence of RC particle size and source material composition were also assessed. Moreover, selected mortars were produced with partial incorporation of fly ash to explore the high alkalinity of RC. Compared to OPC mortars of equal w/b, the compressive strength was not significantly altered for up to 15% RCP and reduced less than 25% for up to 100% RCP. For similar flowability, the water absorption and shrinkage were higher in RC mortars, following the necessary increase of the w/b. However, for fixed w/b, RC mortars presented a more refined interparticle porosity, and the coefficient of absorption decreased with RC content. Shrinkage consistently increased with RC content due to the refined interparticle microstructure, higher water demand and lower particle hardness of RC. Nevertheless, the 90 days shrinkage increased less than 17% for up to 50% RCP. Overall, RC's high potential was shown as an active supplementary cementitious material, with a negligible influence on shrinkage for up to 50% replacement.
Shrinkage and sorptivity of mortars with thermoactivated recycled cement
Carriço, Ana (author) / Bogas, José Alexandre (author) / Real, Sofia (author) / Pereira, Manuel Francisco Costa (author)
2022-04-03
Article (Journal)
Electronic Resource
English
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