TY - JOUR
T1 - Effect of steel fibers on the performance of concrete made with recycled concrete aggregates and dune sand
AU - Kachouh, Nancy
AU - El-Hassan, Hilal
AU - El-Maaddawy, Tamer
N1 - Funding Information:
This project is supported by the United Arab Emirates University (UAEU) [grant number 31N258 ]. The authors are thankful to Al Dhafra Recycling Facilities for providing the recycled concrete aggregates. The contributions of the UAEU engineers and staff are also greatly appreciated.
Publisher Copyright:
© 2019 Elsevier Ltd
PY - 2019/7/20
Y1 - 2019/7/20
N2 - This paper aims to develop and evaluate the performance of steel fiber-reinforced concrete made with recycled concrete aggregates (RCA) and desert dune sand. Different fresh and hardened properties of RCA concrete mixtures with and without steel fibers were evaluated and compared with those of a mixture made with natural coarse aggregates (NA). Test parameters included the RCA replacement percentage and steel fibers (SF) volume fraction (v f ). Test results showed that the substitution of 30% of NA with RCA in plain concrete mixes did not reduce the design cylinder compressive strength (f′ c ), whereas the use of higher percentages of RCA replacement compromised the fresh and hardened properties of the concrete. The addition of SF significantly reduced the adverse effects caused by the inclusions of RCA in the mixes. RCA-based concrete mixtures having 70 and 100% RCA replacements could be produced with f′ c values comparable to that of a NA-based concrete, when minimum v f values of 1, and 2% were added, respectively. The RCA replacement increased the water absorption and sorptivity but decreased the ultrasonic pulse velocity, bulk resistivity, and abrasion resistance. The addition of SF improved the hardened properties of RCA-based concrete mixes to an extent of exceeding some of those of the NA-based counterpart, as in the case of abrasion resistance. Analytical regression models were introduced to correlate different concrete properties to the 28-day cylinder compressive strength.
AB - This paper aims to develop and evaluate the performance of steel fiber-reinforced concrete made with recycled concrete aggregates (RCA) and desert dune sand. Different fresh and hardened properties of RCA concrete mixtures with and without steel fibers were evaluated and compared with those of a mixture made with natural coarse aggregates (NA). Test parameters included the RCA replacement percentage and steel fibers (SF) volume fraction (v f ). Test results showed that the substitution of 30% of NA with RCA in plain concrete mixes did not reduce the design cylinder compressive strength (f′ c ), whereas the use of higher percentages of RCA replacement compromised the fresh and hardened properties of the concrete. The addition of SF significantly reduced the adverse effects caused by the inclusions of RCA in the mixes. RCA-based concrete mixtures having 70 and 100% RCA replacements could be produced with f′ c values comparable to that of a NA-based concrete, when minimum v f values of 1, and 2% were added, respectively. The RCA replacement increased the water absorption and sorptivity but decreased the ultrasonic pulse velocity, bulk resistivity, and abrasion resistance. The addition of SF improved the hardened properties of RCA-based concrete mixes to an extent of exceeding some of those of the NA-based counterpart, as in the case of abrasion resistance. Analytical regression models were introduced to correlate different concrete properties to the 28-day cylinder compressive strength.
KW - Analytical regression model
KW - Dune sand
KW - Fresh properties
KW - Hardened properties
KW - Recycled concrete aggregate
KW - Steel fibers
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U2 - 10.1016/j.conbuildmat.2019.04.087
DO - 10.1016/j.conbuildmat.2019.04.087
M3 - Article
AN - SCOPUS:85064226760
SN - 0950-0618
VL - 213
SP - 348
EP - 359
JO - Construction and Building Materials
JF - Construction and Building Materials
ER -