TY - GEN
T1 - Properties of Geopolymer Concrete Made With Recycled Concrete Aggregates and Glass Fibers
AU - Abughali, Mohammed
AU - El-Hassan, Hilal
AU - El Maaddawy, Tamer
N1 - Publisher Copyright:
© 2024, Avestia Publishing. All rights reserved.
PY - 2024
Y1 - 2024
N2 - This research aims to evaluate the workability and compressive strength of geopolymer concrete made with recycled concrete aggregates (RCA) and glass fibers (GF). The ambient-cured geopolymer concrete was prepared using a binder blend of slag and fly ash (3:1) and fine aggregates in the form of desert dune sand. Natural aggregates or RCA served as the coarse aggregates, while sodium silicate and sodium hydroxide formulated the alkaline activator solution. The investigated process parameters included the replacement percentage of natural aggregates with RCA, binder content, amount of additional water (added to the alkaline activator solution), particle size distribution of RCA, and volume fraction of GF. Experimental results indicated that replacing natural aggregates with 100% RCA had an insignificant impact on the workability but reduced the compressive strength by up to 25%. Increasing the binder content from 300 to 450 kg/m3 in RCA geopolymer concrete reinforced with up to 2% GF, by volume, led to up to 28, 106, and 17% higher workability and 1- and 7-day compressive strengths, respectively. Adding up to 50 kg/m3 of water increased the workability up to 230 mm while decreasing the compressive strength by up to 22%. Meanwhile, sieving the RCA to remove particles smaller and larger than 4.75 mm and 19 mm, respectively, increased the slump to 210 mm and 1- and 7-day compressive strength by 29 and 35%, correspondingly. The addition of 1 and 2% GF, by volume, decreased the workability by 2 and 9%, respectively, in comparison to the plain RCA geopolymer concrete mix, while the compressive strength was unaffected. Experimental findings highlight the possibility of utilizing RCA as a replacement for natural aggregates in slag-fly ash blended geopolymer concrete reinforced with glass fibers without compromising performance. Such beneficial use of RCA serves as a means of alleviating the adverse environmental impact associated with its disposal.
AB - This research aims to evaluate the workability and compressive strength of geopolymer concrete made with recycled concrete aggregates (RCA) and glass fibers (GF). The ambient-cured geopolymer concrete was prepared using a binder blend of slag and fly ash (3:1) and fine aggregates in the form of desert dune sand. Natural aggregates or RCA served as the coarse aggregates, while sodium silicate and sodium hydroxide formulated the alkaline activator solution. The investigated process parameters included the replacement percentage of natural aggregates with RCA, binder content, amount of additional water (added to the alkaline activator solution), particle size distribution of RCA, and volume fraction of GF. Experimental results indicated that replacing natural aggregates with 100% RCA had an insignificant impact on the workability but reduced the compressive strength by up to 25%. Increasing the binder content from 300 to 450 kg/m3 in RCA geopolymer concrete reinforced with up to 2% GF, by volume, led to up to 28, 106, and 17% higher workability and 1- and 7-day compressive strengths, respectively. Adding up to 50 kg/m3 of water increased the workability up to 230 mm while decreasing the compressive strength by up to 22%. Meanwhile, sieving the RCA to remove particles smaller and larger than 4.75 mm and 19 mm, respectively, increased the slump to 210 mm and 1- and 7-day compressive strength by 29 and 35%, correspondingly. The addition of 1 and 2% GF, by volume, decreased the workability by 2 and 9%, respectively, in comparison to the plain RCA geopolymer concrete mix, while the compressive strength was unaffected. Experimental findings highlight the possibility of utilizing RCA as a replacement for natural aggregates in slag-fly ash blended geopolymer concrete reinforced with glass fibers without compromising performance. Such beneficial use of RCA serves as a means of alleviating the adverse environmental impact associated with its disposal.
KW - compressive strength
KW - concrete
KW - fibers
KW - Geopolymer
KW - recycled aggregates
KW - slump
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U2 - 10.11159/iccste24.199
DO - 10.11159/iccste24.199
M3 - Conference contribution
AN - SCOPUS:85200374142
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 -