Rights statement: This is the author’s version of a work that was accepted for publication in Construction and Building Materials. 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 Construction and Building Materials, 312, 2021 DOI: 10.1016/j.conbuildmat.2021.125430
Accepted author manuscript, 2.57 MB, PDF document
Available under license: CC BY-NC-ND
Final published version
Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
}
TY - JOUR
T1 - Ultra-lightweight high ductility cement composite incorporated with low PE fiber and rubber powder
AU - Huang, Z.
AU - Liang, T.
AU - Huang, B.
AU - Zhou, Y.
AU - Ye, J.
N1 - This is the author’s version of a work that was accepted for publication in Construction and Building Materials. 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 Construction and Building Materials, 312, 2021 DOI: 10.1016/j.conbuildmat.2021.125430
PY - 2021/12/20
Y1 - 2021/12/20
N2 - This paper presents the development and performance assessment of a novel ultra-lightweight high ductility cement composite (ULHDCC) incorporated with fly ash cenospheres, rubber powders and low fiber content of 0.7%. To address the brittle nature of such cement composite, this paper utilized the surface treated polyethylene (PE) fibers to improve the ductility behavior, and used rubber powders replacing part of cenospheres to reduce the matrix fracture toughness to achieve the pseudo-strain-hardening (PSH) performance. A fracture micromechanics-based investigation was performed to explain the high tensile ductility behavior of the ULHDCC. The mechanical properties including compressive and tensile strength, elastic modulus and microstructure has been experimentally examined. The results showed that the ULHDCC had the compressive strength ranging from 35.2 MPa to 43.5 MPa. The tensile strain in direct tensile test achieved 3% even with low fiber content of 0.7% PE fibers by volume. A relatively large amount of FAC (fly ash cenospheres) and rubber powder increased the entrapped air voids in the ULHDCC and reduced its density and strength. The ductility of ULHDCC was improved with the incorporation of rubber powder. Compared to normal engineering cement composite (ECC), to achieve similar tensile strain capacity the fiber content has been reduced 50% which leads to reduce the cost significantly.
AB - This paper presents the development and performance assessment of a novel ultra-lightweight high ductility cement composite (ULHDCC) incorporated with fly ash cenospheres, rubber powders and low fiber content of 0.7%. To address the brittle nature of such cement composite, this paper utilized the surface treated polyethylene (PE) fibers to improve the ductility behavior, and used rubber powders replacing part of cenospheres to reduce the matrix fracture toughness to achieve the pseudo-strain-hardening (PSH) performance. A fracture micromechanics-based investigation was performed to explain the high tensile ductility behavior of the ULHDCC. The mechanical properties including compressive and tensile strength, elastic modulus and microstructure has been experimentally examined. The results showed that the ULHDCC had the compressive strength ranging from 35.2 MPa to 43.5 MPa. The tensile strain in direct tensile test achieved 3% even with low fiber content of 0.7% PE fibers by volume. A relatively large amount of FAC (fly ash cenospheres) and rubber powder increased the entrapped air voids in the ULHDCC and reduced its density and strength. The ductility of ULHDCC was improved with the incorporation of rubber powder. Compared to normal engineering cement composite (ECC), to achieve similar tensile strain capacity the fiber content has been reduced 50% which leads to reduce the cost significantly.
KW - ECC
KW - FAC
KW - Fiber-reinforced
KW - High ductility
KW - Lightweight concrete
KW - Cements
KW - Composite materials
KW - Compressive strength
KW - Ductility
KW - Fibers
KW - Fly ash
KW - Fracture toughness
KW - Rubber
KW - Strain hardening
KW - Tensile strain
KW - Tensile strength
KW - Tensile testing
KW - Cement composite
KW - Engineering cement composite
KW - Fibers content
KW - Fibre-reinforced
KW - Fly ash cenospheres
KW - Polyethylene fibers
KW - Rubber powders
KW - Ultra lightweights
KW - Powders
U2 - 10.1016/j.conbuildmat.2021.125430
DO - 10.1016/j.conbuildmat.2021.125430
M3 - Journal article
VL - 312
JO - Construction and Building Materials
JF - Construction and Building Materials
SN - 0950-0618
M1 - 125430
ER -