TY - JOUR

T1 - Performance evaluation of steel-polypropylene hybrid fiber reinforced concrete under supercritical carbonation

AU - Bao, Hao

AU - Yu, Min

AU - Chi, Yin

AU - Liu, Yu

AU - Ye, Jianqiao

N1 - This is the author’s version of a work that was accepted for publication in Journal of Building Engineering. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Journal of Building Engineering, 43, 2021 DOI: 10.1016/j.jobe.2021/103159

PY - 2021/11/30

Y1 - 2021/11/30

N2 - In this paper, systematic supercritical carbonation tests of steel-polypropylene hybrid fiber reinforced concrete (SPFRC) were carried out to evaluate the performance of SPFRC under supercritical condition. The effects of the length-diameter ratio of steel fiber, volume fraction of steel fiber, and polypropylene fiber on the carbonation depth and compressive strength of concrete under supercritical condition were studied. A one-dimensional mathematical model for the physical-chemical coupling process of supercritical carbonation of cement-based materials was established. The relational model between the equivalent porosity and the compressive strength of fully carbonated SPFRC was also proposed. Results indicate that whether the addition of steel fibers or polypropylene fibers or the inclusion of fibers can accelerate the carbonation process by the increase of porosity. The carbonation depths of SPFRC increase with the increase of the addition of steel fibers and polypropylene fibers. The compressive strength after carbonation is significantly increased. The maximum relative compressive strength was obtained when the volume fraction of steel fibers and polypropylene fibers were 1.5% and 0.0% and the length-diameter ratio of steel fiber was 60, respectively. Furthermore, a mathematical model was proposed to evaluate the equivalent initial porosity of SPFRC.

AB - In this paper, systematic supercritical carbonation tests of steel-polypropylene hybrid fiber reinforced concrete (SPFRC) were carried out to evaluate the performance of SPFRC under supercritical condition. The effects of the length-diameter ratio of steel fiber, volume fraction of steel fiber, and polypropylene fiber on the carbonation depth and compressive strength of concrete under supercritical condition were studied. A one-dimensional mathematical model for the physical-chemical coupling process of supercritical carbonation of cement-based materials was established. The relational model between the equivalent porosity and the compressive strength of fully carbonated SPFRC was also proposed. Results indicate that whether the addition of steel fibers or polypropylene fibers or the inclusion of fibers can accelerate the carbonation process by the increase of porosity. The carbonation depths of SPFRC increase with the increase of the addition of steel fibers and polypropylene fibers. The compressive strength after carbonation is significantly increased. The maximum relative compressive strength was obtained when the volume fraction of steel fibers and polypropylene fibers were 1.5% and 0.0% and the length-diameter ratio of steel fiber was 60, respectively. Furthermore, a mathematical model was proposed to evaluate the equivalent initial porosity of SPFRC.

KW - Carbonation depth

KW - Compressive strength

KW - Polypropylene fibers

KW - Steel fibers

KW - Supercritical carbonation

U2 - 10.1016/j.jobe.2021.103159

DO - 10.1016/j.jobe.2021.103159

M3 - Journal article

AN - SCOPUS:85121007416

VL - 43

JO - Journal of Building Engineering

JF - Journal of Building Engineering

SN - 2352-7102

M1 - 103159

ER -