TY - GEN
T1 - Development of Carbonation-Cured Alkali-Activated Slag Masonry Units
AU - Hwalla, Joud
AU - El-Hassan, Hilal
N1 - Publisher Copyright:
© 2024, Avestia Publishing. All rights reserved.
PY - 2024
Y1 - 2024
N2 - This paper investigates the impact of early accelerated carbonation curing on the performance of alkali-activated slag concrete masonry blocks. The study employed crushed dolomitic limestone aggregates, with a binder-to-aggregate ratio of 1:6. A sodium based alkaline solution, prepared with a sodium silicate to sodium hydroxide ratio of 1.5, was incorporated into the concrete batch at a solution-to-binder ratio of 0.6. The influence of carbonation curing parameters on the performance of concrete masonry blocks was evaluated, including initial ambient curing duration (0, 2, and 4 hours), carbonation duration (4 and 24 hours), and carbonation pressure (1 and 5 bars). These parameters were analyzed in relation to carbon uptake, compressive strength at 1, 7, and 28 days, and water absorption of the concrete masonry blocks. Additionally, a comparative assessment of the global warming indices associated with the production of cementitious and carbonation-cured alkali-activated slag masonry units was developed. The results reveal that carbon uptake and water absorption capacity increased with longer initial and carbonation curing durations and higher carbonation pressures. The compressive strength was either maintained or decreased due to the decalcification of calcium-rich gel produced during the activation reaction by carbonation curing. However, all mixes demonstrated suitability as non-load-bearing blocks, achieving strengths higher than 4.1 MPa after 1 day of batching. The environmental impact analysis indicator a reduction of 79.2% in the production of 1 m3 of carbonation-cured alkali-activated slag concrete in comparison to cement-based counterparts.
AB - This paper investigates the impact of early accelerated carbonation curing on the performance of alkali-activated slag concrete masonry blocks. The study employed crushed dolomitic limestone aggregates, with a binder-to-aggregate ratio of 1:6. A sodium based alkaline solution, prepared with a sodium silicate to sodium hydroxide ratio of 1.5, was incorporated into the concrete batch at a solution-to-binder ratio of 0.6. The influence of carbonation curing parameters on the performance of concrete masonry blocks was evaluated, including initial ambient curing duration (0, 2, and 4 hours), carbonation duration (4 and 24 hours), and carbonation pressure (1 and 5 bars). These parameters were analyzed in relation to carbon uptake, compressive strength at 1, 7, and 28 days, and water absorption of the concrete masonry blocks. Additionally, a comparative assessment of the global warming indices associated with the production of cementitious and carbonation-cured alkali-activated slag masonry units was developed. The results reveal that carbon uptake and water absorption capacity increased with longer initial and carbonation curing durations and higher carbonation pressures. The compressive strength was either maintained or decreased due to the decalcification of calcium-rich gel produced during the activation reaction by carbonation curing. However, all mixes demonstrated suitability as non-load-bearing blocks, achieving strengths higher than 4.1 MPa after 1 day of batching. The environmental impact analysis indicator a reduction of 79.2% in the production of 1 m3 of carbonation-cured alkali-activated slag concrete in comparison to cement-based counterparts.
KW - Alkali-activated materials
KW - Carbon uptake
KW - Compressive strength
KW - Economic impact
KW - Masonry blocks
KW - Slag
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U2 - 10.11159/iccste24.153
DO - 10.11159/iccste24.153
M3 - Conference contribution
AN - SCOPUS:85200343020
SN - 9781990800382
T3 - International Conference on Civil, Structural and Transportation Engineering
BT - Proceedings of the 9th International Conference On Civil Structural and Transportation Engineering, ICCSTE 2024
A2 - Sennah, Khaled
PB - Avestia Publishing
T2 - 9th International Conference on Civil, Structural and Transportation Engineering, ICCSTE 2024
Y2 - 13 June 2024 through 15 June 2024
ER -