Flexural behavior and microstructure of hybrid basalt textile and steel fiber reinforced alkali-activated slag panels exposed to elevated temperatures

Tao Li; Yamei Zhang; Jian-Guo Dai

doi:10.1016/j.conbuildmat.2017.07.059

Flexural behavior and microstructure of hybrid basalt textile and steel fiber reinforced alkali-activated slag panels exposed to elevated temperatures

Tao Li
, Yamei Zhang^*
, Jian-Guo Dai^*

^*Corresponding author for this work

Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review

47 Citations (Scopus)

Abstract

This study investigates the effects of high temperatures and exposure duration on the flexural behavior and microstructure of hybrid basalt textile and steel fiber reinforced alkali-activated slag panels. Three-point bending tests were conducted after heating specimens to 400 °C, 600 °C, and 800 °C for durations of 1 and 2 h. The effects of thermal exposure on the matrix and the basalt fibers from the panels were investigated with scanning electron microscopy. Element and phase analyses of the matrix were performed after exposure to high temperatures via energy dispersive spectroscopy and X-ray diffraction, respectively. The first crack and peak flexural strength of the specimens not exposed to heat reached 8.9 and 20.5 MPa, respectively. Obvious decreases in flexural performance occurred as temperature and duration increased as a result of the decomposition of the alkali-activated slag mortar (AASM) matrix and the deterioration of the bonding performance between the basalt textile and the matrix. Changing of the Ca/Si ratio, the Al/Si ratio, and the crystalline phase of the AASM matrix indicated that phase transformation occurred after heat exposure at 800 °C. © 2017 Published by Elsevier Ltd.

Original language	English
Pages (from-to)	651-660
Journal	Construction and Building Materials
Volume	152
Online published	12 Jul 2017
DOIs	https://doi.org/10.1016/j.conbuildmat.2017.07.059
Publication status	Published - 15 Oct 2017
Externally published	Yes

Bibliographical note

Publication details (e.g. title, author(s), publication statuses and dates) are captured on an “AS IS” and “AS AVAILABLE” basis at the time of record harvesting from the data source. Suggestions for further amendments or supplementary information can be sent to [email protected].

Funding

The authors acknowledge financial support from the Construction Industry Council Fund (Project code: K-ZJK2) of the Hong Kong S.A.R. and the National Natural Science Foundation of China (51378115 and 51638008).

Research Keywords

Alkali-activated slag
Duration
Elevated temperature
Flexural behavior
Hybrid reinforcement
Microstructure

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10.1016/j.conbuildmat.2017.07.059

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@article{0e7a9b8a62154794b72c562a87f34adf,

title = "Flexural behavior and microstructure of hybrid basalt textile and steel fiber reinforced alkali-activated slag panels exposed to elevated temperatures",

abstract = "This study investigates the effects of high temperatures and exposure duration on the flexural behavior and microstructure of hybrid basalt textile and steel fiber reinforced alkali-activated slag panels. Three-point bending tests were conducted after heating specimens to 400 °C, 600 °C, and 800 °C for durations of 1 and 2 h. The effects of thermal exposure on the matrix and the basalt fibers from the panels were investigated with scanning electron microscopy. Element and phase analyses of the matrix were performed after exposure to high temperatures via energy dispersive spectroscopy and X-ray diffraction, respectively. The first crack and peak flexural strength of the specimens not exposed to heat reached 8.9 and 20.5 MPa, respectively. Obvious decreases in flexural performance occurred as temperature and duration increased as a result of the decomposition of the alkali-activated slag mortar (AASM) matrix and the deterioration of the bonding performance between the basalt textile and the matrix. Changing of the Ca/Si ratio, the Al/Si ratio, and the crystalline phase of the AASM matrix indicated that phase transformation occurred after heat exposure at 800 °C. {\textcopyright} 2017 Published by Elsevier Ltd.",

keywords = "Alkali-activated slag, Duration, Elevated temperature, Flexural behavior, Hybrid reinforcement, Microstructure",

author = "Tao Li and Yamei Zhang and Jian-Guo Dai",

note = "Publication details (e.g. title, author(s), publication statuses and dates) are captured on an “AS IS” and “AS AVAILABLE” basis at the time of record harvesting from the data source. Suggestions for further amendments or supplementary information can be sent to [email protected].",

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Flexural behavior and microstructure of hybrid basalt textile and steel fiber reinforced alkali-activated slag panels exposed to elevated temperatures. / Li, Tao; Zhang, Yamei; Dai, Jian-Guo.
In: Construction and Building Materials, Vol. 152, 15.10.2017, p. 651-660.

Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review

TY - JOUR

T1 - Flexural behavior and microstructure of hybrid basalt textile and steel fiber reinforced alkali-activated slag panels exposed to elevated temperatures

AU - Li, Tao

AU - Zhang, Yamei

AU - Dai, Jian-Guo

N1 - Publication details (e.g. title, author(s), publication statuses and dates) are captured on an “AS IS” and “AS AVAILABLE” basis at the time of record harvesting from the data source. Suggestions for further amendments or supplementary information can be sent to [email protected].

PY - 2017/10/15

Y1 - 2017/10/15

N2 - This study investigates the effects of high temperatures and exposure duration on the flexural behavior and microstructure of hybrid basalt textile and steel fiber reinforced alkali-activated slag panels. Three-point bending tests were conducted after heating specimens to 400 °C, 600 °C, and 800 °C for durations of 1 and 2 h. The effects of thermal exposure on the matrix and the basalt fibers from the panels were investigated with scanning electron microscopy. Element and phase analyses of the matrix were performed after exposure to high temperatures via energy dispersive spectroscopy and X-ray diffraction, respectively. The first crack and peak flexural strength of the specimens not exposed to heat reached 8.9 and 20.5 MPa, respectively. Obvious decreases in flexural performance occurred as temperature and duration increased as a result of the decomposition of the alkali-activated slag mortar (AASM) matrix and the deterioration of the bonding performance between the basalt textile and the matrix. Changing of the Ca/Si ratio, the Al/Si ratio, and the crystalline phase of the AASM matrix indicated that phase transformation occurred after heat exposure at 800 °C. © 2017 Published by Elsevier Ltd.

AB - This study investigates the effects of high temperatures and exposure duration on the flexural behavior and microstructure of hybrid basalt textile and steel fiber reinforced alkali-activated slag panels. Three-point bending tests were conducted after heating specimens to 400 °C, 600 °C, and 800 °C for durations of 1 and 2 h. The effects of thermal exposure on the matrix and the basalt fibers from the panels were investigated with scanning electron microscopy. Element and phase analyses of the matrix were performed after exposure to high temperatures via energy dispersive spectroscopy and X-ray diffraction, respectively. The first crack and peak flexural strength of the specimens not exposed to heat reached 8.9 and 20.5 MPa, respectively. Obvious decreases in flexural performance occurred as temperature and duration increased as a result of the decomposition of the alkali-activated slag mortar (AASM) matrix and the deterioration of the bonding performance between the basalt textile and the matrix. Changing of the Ca/Si ratio, the Al/Si ratio, and the crystalline phase of the AASM matrix indicated that phase transformation occurred after heat exposure at 800 °C. © 2017 Published by Elsevier Ltd.

KW - Alkali-activated slag

KW - Duration

KW - Elevated temperature

KW - Flexural behavior

KW - Hybrid reinforcement

KW - Microstructure

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DO - 10.1016/j.conbuildmat.2017.07.059

M3 - RGC 21 - Publication in refereed journal

AN - SCOPUS:85022336918

SN - 0950-0618

VL - 152

SP - 651

EP - 660

JO - Construction and Building Materials

JF - Construction and Building Materials

ER -

Flexural behavior and microstructure of hybrid basalt textile and steel fiber reinforced alkali-activated slag panels exposed to elevated temperatures

Abstract

Bibliographical note

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Research Keywords

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