TY - JOUR
T1 - Lightweight ultra-high-performance concrete (UHPC) with expanded glass aggregate
T2 - Development, characterization, and life-cycle assessment
AU - Guo, Pengwei
AU - Meng, Weina
AU - Du, Jiang
AU - Han, Baoguo
AU - Bao, Yi
N1 - Publisher Copyright:
© 2023 Elsevier Ltd
PY - 2023/3/31
Y1 - 2023/3/31
N2 - Ultra-high-performance concrete (UHPC) has high mechanical strengths and durability, but its density and carbon footprint are usually high. This paper developed a lightweight UHPC with low cost, low carbon footprint, low energy consumption, low thermal conductivity, and high ductility, by using three types of lightweight ingredients: hollow glass microsphere (460 kg/m3), expanded glass aggregate (800 kg/m3), and polyethylene fibers (970 kg/m3). Underlying mechanisms were investigated through thermogravimetry, X-ray diffraction, and mercury intrusion porosimetry analyses. Results showed that the hollow glass microsphere reduced the thermal conductivity of concrete; the expanded glass aggregate mitigated shrinkage while enhancing compressive strengths and flexural properties of concrete through internal curing; and the polyethylene fibers promoted multiple cracks, increasing ductility and toughness of concrete. With 20 % hollow glass microsphere, 1.5 % polyethylene fiber, and 25 % expanded glass, UHPC mixtures were developed to achieve high compressive strength (>127 MPa) and high flexural strength (>21 MPa), while reducing the density by 20 % and carbon footprint by 16 % as well as embodied energy by 27 %.
AB - Ultra-high-performance concrete (UHPC) has high mechanical strengths and durability, but its density and carbon footprint are usually high. This paper developed a lightweight UHPC with low cost, low carbon footprint, low energy consumption, low thermal conductivity, and high ductility, by using three types of lightweight ingredients: hollow glass microsphere (460 kg/m3), expanded glass aggregate (800 kg/m3), and polyethylene fibers (970 kg/m3). Underlying mechanisms were investigated through thermogravimetry, X-ray diffraction, and mercury intrusion porosimetry analyses. Results showed that the hollow glass microsphere reduced the thermal conductivity of concrete; the expanded glass aggregate mitigated shrinkage while enhancing compressive strengths and flexural properties of concrete through internal curing; and the polyethylene fibers promoted multiple cracks, increasing ductility and toughness of concrete. With 20 % hollow glass microsphere, 1.5 % polyethylene fiber, and 25 % expanded glass, UHPC mixtures were developed to achieve high compressive strength (>127 MPa) and high flexural strength (>21 MPa), while reducing the density by 20 % and carbon footprint by 16 % as well as embodied energy by 27 %.
KW - Expanded glass
KW - Glass microsphere
KW - Internal curing
KW - Lightweight
KW - Polyethylene fiber
KW - Ultra-high-performance concrete (UHPC)
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U2 - 10.1016/j.conbuildmat.2023.130441
DO - 10.1016/j.conbuildmat.2023.130441
M3 - Article
AN - SCOPUS:85149178396
SN - 0950-0618
VL - 371
JO - Construction and Building Materials
JF - Construction and Building Materials
M1 - 130441
ER -