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Influence of elevated temperature on the engineering properties of ultra-high-performance fiber-reinforced concrete Cover

Influence of elevated temperature on the engineering properties of ultra-high-performance fiber-reinforced concrete

Materials Science-Poland
Volume 41 (2023): Issue 1 (March 2023)
By: ,   and    
Open Access
|Aug 2023
Figures & tables

Figures & Tables

Fig. 1.

Fibers: (A) hooked-steel fibers; (B) polyvinyl alcohol fibers (C) polypropylene fibers

Table 1.

Cement and silica fume properties

Type 1 CementSilica Fume
Chemical composition (%)CaO64.12.15
SiO221.889.5
AL2O35.250.43
Fe2O34.103.25
MgO0.711.30
TiO20.30.0
SO32.40.74
Physical propertiesL.O.I2.182.47
Mean particle size (μm)40.10.32
Specific gravity3.152.2
Table 2.

UHPC mixture proportions for 1 m3

MaterialWeight (kg/m3)
Cement900.0
Fine quartz sand1000.0
Silica Fume222.0
Water164.0
Super-plasticizer30
Table 3.

Properties of fibers

Fiber typeFiber properties
ShapeLength (mm)Section dimension (mm)Specific gravityModulus of elasticity (GPa)Tensile strength (MPa)
Steel fibersHooked ends35φ 0.55 (Circular)7.852101225
Polyvinyl alcohol (PVA)straight30φ 0.66 (Circular)1.323900
Polypropylene (PP)straight12φ 0.022 (Circular)0.904550
Table 4.

Percentage of fibers in concrete mixes

Concrete mixFiber by volume (%)
Polyvinyl alcohol (PVA)Polypropylene (PP)Steel fibers (SF)
M0-NF0.00.00.0
M1-S10.00.01.0
M2-S0.7-PVA0.30.30.00.7
M3-S0.7-PVA0.2-PP0.10.20.10.7
M4-S0.7-PVA0.20.20.00.7
M5-S0.5-PVA0.50.50.00.5
Table 5.

Details of test matrix

MixCompression and split TestFlexure Test
Room temp.100°C300°C400°CRoom temp.100°C300°C400°C
M0-NF66663333
M1-S166663333
M2-S0.7-PVA0.366663333
M3-S0.7-PVA0.2-PP0.166663333
M4-S0.7-PVA0.266663333
M5-S0.5-PVA0.566663333
Fig. 2.

Individual time-temperature plots

Fig. 3.

Specimen under testing

Fig. 4.

Prism specimen in flexure test

Table 6.

Fresh UHPC properties

Mix No.Unit Weight (kg/m3)Slump (mm)
M0-NF2318280.0
M1-S12363257.0
M2-S0.7-PVA0.32325256.0
M3-S0.7-PVA0.2-PP0.12294250.0
M4-S0.7-PVA0.22310255.0
M5-S0.5-PVA0.52285251.0
Fig. 5.

All samples after heating-cooling cycle

Fig. 6.

Destroyed concrete specimen from 500°C exposure

Fig. 7.

Representative samples after compression testing: (A) 100°C; (B) 300°C (C) 400°C

Table 7.

Summary of test results of different concrete mixes

MixCompressive strength (MPa)Flexure strength (MPa)Splitting strength (MPa)
Room temp.100°C300°C400°CRoom temp.100°C300°C400°CRoom temp.100°C300°C400°C
M0-NF120.3124.1
(+3%)		105.6
(–12.5%)		88.32
(–26.6%)		10.2710.478.77
(–15.1%)		7.50
(–27.0%)		6.66.8
(+3%)		5.7
(–13.6%)		4.80
(–27.3%)
M1-S1139.8
(16.2%)		143.8
(+2.9%)		132.0
(–5.5%)		104.68
(–25.12%)		19.50
(89.9%)		19.7517.83
(–9.0%)		16.20
(–17.0%)		11.7
(77.3%)		11.9
(+3%)		10.8
(–7.7%)		10.20
(–12.8%)
M2-S0.7-PVA0.3134.6
(11.8%)		139.4
(+3.6%)		123.4
(–8.5%)		110.19
(–18.2%)		19.00
(85%)		19.5317.24
(–9.0%)		15.10
(–20.5%)		12.3
(86.4%)		12.7
(+3%)		11.9
(–3.3%)		10.70
(–13%)
M3-S0.7-PVA0.2-PP0.1131.7
(9.5%)		133.7
(+1%)		129.7
(–1.0%)		102.62
(–21.5%)		17.03
(65.8%)		17.6416.00
(–6.0%)		15.20
(–10.7%)		12.1
(83.3%)		12.4
(+3%)		11.4
(–5.8%)		10.40
(–14%)
M4-S0.7-PVA0.2128.2
(6.8%)		130.3
(+1%)		124.0
(–3.3%)		99.70
(–22.3%)		17.77
(73%)		17.8517.01
(–4.0%)		14.20
(–20.0%)		11.7
(77.3%)		11.8
(+3%)		10.9
(–6.8%)		9.50
(–18.8%)
M5-S0.5-PVA0.5127.8
(6.5%)		131.8
(+3.2%)		119.6
(–6.4%)		97.4
(–23.7%)		16.90
(64.5%)		17.015.85
(–6.0%)		12.90
(–25.0%)		11.3
(74.2%)		11.8
(+3%)		10.8
(–6.1%)		8.90
(–22.6%)

1* The percentage decrease with respect to the ambient temperature is represented by the value enclosed in parentheses.

1** The percentage increase in the samples made without fiber is represented by the value within in parentheses.

Fig. 8.

Stress-strain relations for UHPFRC cylinders at ambient temperature

Fig. 9.

Stress-strain relations for UHPFRC cylinders at 300°C

Fig. 10.

Stress-strain relations for UHPFRC cylinders at 400°C

Fig. 11.

Load-deflection relations for UHPC and UH-PFRC beams (room temp. 26°C)

Fig. 12.

Load-deflection relations for UHPC and UH-PFRC beams (300°C)

Fig. 13.

Load-deflection relations for UHPC and UH-PFRC beams (400°C)

Fig. 14.

Mode of failure of some representative concrete prisms

Fig. 15.

Temperature effects on UHPC and UHPFRC normalized compressive strength

Fig. 16.

Temperature effects on the normalized flexural strength of UHPC and UHPFRC

Fig. 17.

Temperature effects on the normalized splitting tensile strength of UHPC and UHPFRC

Fig. 18.

Effect of temperature on weight loss for UHPC and UHFRC specimens

Fig. 19.

Secondary electron SEM images of concrete exposed to room temperature (a) mix M0-NF, (b) M1-S1, and (c) M3-S0.5+PVA0.5

Fig. 20.

Secondary electron SEM images of concrete containing steel fibers (i.e., M1-S1) after exposure to 400°C

Fig. 21.

Secondary electron SEM images of concrete containing PVA fibers (i.e., M3-S0.7-PVA0.2-PP0.1) after exposure to 400°C

DOI: https://doi.org/10.2478/msp-2023-0010 | Journal eISSN: 2083-134X (formerly 2083-124X) | Journal ISSN: 2083-1331
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Language: English
Page range: 140 - 160
Submitted on: Mar 27, 2023
Accepted on: Jun 7, 2023
Published on: Aug 4, 2023
Published by: Wroclaw University of Science and Technology
In partnership with: Paradigm Publishing Services
Keywords:
UHPC,
UHPFRC,
fibers,
concrete,
mechanical properties,
high temperature
Related subjects:
Materials sciences,
Materials sciences, other,
Nanomaterials,
Functional and smart materials,
Materials characterization and properties

© 2023 Aref A. Abadel, M. Iqbal Khan, Radhouane Masmoudi, published by Wroclaw University of Science and Technology
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

Volume 41 (2023): Issue 1 (March 2023)
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