Fracture properties of alkali-activated slag and ordinary Portland cement concrete and mortar

Yao Ding; Jian-Guo Dai; Cai-Jun Shi

doi:10.1016/j.conbuildmat.2017.12.202

Fracture properties of alkali-activated slag and ordinary Portland cement concrete and mortar

Yao Ding, Jian-Guo Dai^*, Cai-Jun Shi

^*Corresponding author for this work

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

127 Citations (Scopus)

Abstract

Three-point bending (TPB) tests were conducted on notched beams to compare the fracture properties of alkali-activated slag (AAS) concrete and ordinary Portland cement (OPC) concrete at three different compressive strength levels (30, 50 and 70 MPa). Parallel comparisons were also conducted between AAS mortar (AASM) and OPC mortar (OPCM). Load vs. mid-span deflection (P-δ) curves, load vs. crack mouth opening displacement (P-CMOD) curves and load vs. crack tip opening displacement (P-CTOD) curves of the tested beams were obtained. The fracture energy G_F and the characteristic length (l_ch) of the AAS and OPC concrete and mortar were calculated and analyzed. It was found that the G_F of AAS concrete was always higher than that of OPC concrete given the same compressive strength, due to their denser and stronger interfacial transition zones (ITZs). At a compressive strength of 30 MPa, the G_F of AASM was also larger than its OPC counterparts. However, the G_F of AASM became lower than that of OPCM when the compressive strengths were 50 and 70 MPa, as more initial micro-cracks were formed in the AASM matrix with strength increase. In addition, the l_ch values of AAS concrete and mortar were all smaller than those of OPC, implying that the formers were more brittle given the same compressive strengths. The elastic modulus of AAS concrete and mortar were found to be always lower than those of OPC. Micro-structural observations were carried out to explain the above phenomena. © 2017 Elsevier Ltd

Original language	English
Pages (from-to)	310-320
Number of pages	11
Journal	Construction and Building Materials
Volume	165
Online published	11 Jan 2018
DOIs	https://doi.org/10.1016/j.conbuildmat.2017.12.202
Publication status	Published - 20 Mar 2018
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 are grateful for the financial support received from the National Science Foundation of China ( NSFC ) Project Nos. 51638008 and Construction Industry Council Fund (Project code: K-ZJK2). They are also grateful for a PhD studentship awarded to the first author by The Hong Kong Polytechnic University.

Research Keywords

Alkali-activated slag
Characteristic length
Concrete
Fracture property
Mortar
Three-point bending test

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@article{f70b599e56174d63a6b9fea2e3e30395,

title = "Fracture properties of alkali-activated slag and ordinary Portland cement concrete and mortar",

abstract = "Three-point bending (TPB) tests were conducted on notched beams to compare the fracture properties of alkali-activated slag (AAS) concrete and ordinary Portland cement (OPC) concrete at three different compressive strength levels (30, 50 and 70 MPa). Parallel comparisons were also conducted between AAS mortar (AASM) and OPC mortar (OPCM). Load vs. mid-span deflection (P-δ) curves, load vs. crack mouth opening displacement (P-CMOD) curves and load vs. crack tip opening displacement (P-CTOD) curves of the tested beams were obtained. The fracture energy GF and the characteristic length (lch) of the AAS and OPC concrete and mortar were calculated and analyzed. It was found that the GF of AAS concrete was always higher than that of OPC concrete given the same compressive strength, due to their denser and stronger interfacial transition zones (ITZs). At a compressive strength of 30 MPa, the GF of AASM was also larger than its OPC counterparts. However, the GF of AASM became lower than that of OPCM when the compressive strengths were 50 and 70 MPa, as more initial micro-cracks were formed in the AASM matrix with strength increase. In addition, the lch values of AAS concrete and mortar were all smaller than those of OPC, implying that the formers were more brittle given the same compressive strengths. The elastic modulus of AAS concrete and mortar were found to be always lower than those of OPC. Micro-structural observations were carried out to explain the above phenomena. {\textcopyright} 2017 Elsevier Ltd",

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T1 - Fracture properties of alkali-activated slag and ordinary Portland cement concrete and mortar

AU - Ding, Yao

AU - Dai, Jian-Guo

AU - Shi, Cai-Jun

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 - 2018/3/20

Y1 - 2018/3/20

N2 - Three-point bending (TPB) tests were conducted on notched beams to compare the fracture properties of alkali-activated slag (AAS) concrete and ordinary Portland cement (OPC) concrete at three different compressive strength levels (30, 50 and 70 MPa). Parallel comparisons were also conducted between AAS mortar (AASM) and OPC mortar (OPCM). Load vs. mid-span deflection (P-δ) curves, load vs. crack mouth opening displacement (P-CMOD) curves and load vs. crack tip opening displacement (P-CTOD) curves of the tested beams were obtained. The fracture energy GF and the characteristic length (lch) of the AAS and OPC concrete and mortar were calculated and analyzed. It was found that the GF of AAS concrete was always higher than that of OPC concrete given the same compressive strength, due to their denser and stronger interfacial transition zones (ITZs). At a compressive strength of 30 MPa, the GF of AASM was also larger than its OPC counterparts. However, the GF of AASM became lower than that of OPCM when the compressive strengths were 50 and 70 MPa, as more initial micro-cracks were formed in the AASM matrix with strength increase. In addition, the lch values of AAS concrete and mortar were all smaller than those of OPC, implying that the formers were more brittle given the same compressive strengths. The elastic modulus of AAS concrete and mortar were found to be always lower than those of OPC. Micro-structural observations were carried out to explain the above phenomena. © 2017 Elsevier Ltd

AB - Three-point bending (TPB) tests were conducted on notched beams to compare the fracture properties of alkali-activated slag (AAS) concrete and ordinary Portland cement (OPC) concrete at three different compressive strength levels (30, 50 and 70 MPa). Parallel comparisons were also conducted between AAS mortar (AASM) and OPC mortar (OPCM). Load vs. mid-span deflection (P-δ) curves, load vs. crack mouth opening displacement (P-CMOD) curves and load vs. crack tip opening displacement (P-CTOD) curves of the tested beams were obtained. The fracture energy GF and the characteristic length (lch) of the AAS and OPC concrete and mortar were calculated and analyzed. It was found that the GF of AAS concrete was always higher than that of OPC concrete given the same compressive strength, due to their denser and stronger interfacial transition zones (ITZs). At a compressive strength of 30 MPa, the GF of AASM was also larger than its OPC counterparts. However, the GF of AASM became lower than that of OPCM when the compressive strengths were 50 and 70 MPa, as more initial micro-cracks were formed in the AASM matrix with strength increase. In addition, the lch values of AAS concrete and mortar were all smaller than those of OPC, implying that the formers were more brittle given the same compressive strengths. The elastic modulus of AAS concrete and mortar were found to be always lower than those of OPC. Micro-structural observations were carried out to explain the above phenomena. © 2017 Elsevier Ltd

KW - Alkali-activated slag

KW - Characteristic length

KW - Concrete

KW - Fracture property

KW - Mortar

KW - Three-point bending test

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DO - 10.1016/j.conbuildmat.2017.12.202

M3 - RGC 21 - Publication in refereed journal

AN - SCOPUS:85042851667

SN - 0950-0618

VL - 165

SP - 310

EP - 320

JO - Construction and Building Materials

JF - Construction and Building Materials

ER -

Fracture properties of alkali-activated slag and ordinary Portland cement concrete and mortar

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