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Flexural Properties of Thin Fly Ash Geopolymers at Elevated Temperature

Yong-Sing Ng Yun-Ming Liew Cheng-Yong Heah Mohd Mustafa Al Bakri Abdullah Hui-Teng Ng Lynette Wei Ling Chan
Archives of Metallurgy and Materials | 2022 | vol. 67 | No 3 | 1145-1150 | DOI: 10.24425/amm.2022.139714
Keywords thin geopolymer fly ash elevated temperature flexural strength
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Abstract

This paper reports on the flexural properties of thin fly ash geopolymers exposed to elevated temperature. The thin fly ash geopolymers (dimension = 160 mm × 40 mm × 10 mm) were synthesised using12M NaOH solution mixed with designed solids-to-liquids ratio of 1:2.5 and Na2SiO3/NaOH ratio of 1:4 and underwent heat treatment at different elevated temperature (300°C, 600°C, 900°C and 1150°C) after 28 days of curing. Flexural strength test was accessed to compare the flexural properties while X-Ray Diffraction (XRD) analysis was performed to determine the phase transformation of thin geopolymers at elevated temperature. Results showed that application of heat treatment boosted the flexural properties of thin fly ash geopolymers as the flexural strength increased from 6.5 MPa (room temperature) to 16.2 MPa (1150°C). XRD results showed that the presence of crystalline phases of albite and nepheline contributed to the increment in flexural strength.
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Authors and Affiliations

Yong-Sing Ng
1 2
Yun-Ming Liew
1 2
ORCID: ORCID
Cheng-Yong Heah
1 3
Mohd Mustafa Al Bakri Abdullah
1 2
ORCID: ORCID
Hui-Teng Ng
1 2
Lynette Wei Ling Chan
4
  1. Universiti Malaysia Perlis (UniMAP), Center of Excellence Geopolymer and Green Technology (CeGeoGTech), Kangar, 01000 Perlis, Malaysia
  2. Universiti Malaysia Perlis (UniMAP), Faculty of Chemical Engineering Technology, Kangar, 01000 Perlis, Malaysia
  3. Universiti Malaysia Faculty of Mechanical Engineering Technology, Perlis (UniMAP), Kangar, 01000 Perlis, Malaysia
  4. Ceramic Research Company Sdn Bhd (Guocera-Hong Leong Group), Lot 7110, 5½ Miles, Jalan Kapar, 42100 Klang, Selangor, Malaysia

Effect of increased temperature on dimensional and shape accuracy of castings produced from the EN AC-AlSi11 alloy by pressure die casting process

A. Jarco
Archives of Metallurgy and Materials | 2019 | vol. 64 | No 1 | 325-328 | DOI: 10.24425/amm.2019.126255
Keywords High Pressure Die Casting Al-Si alloy blistering dimensional and shape accuracy elevated temperature behavior
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Abstract

The present work discusses results of increased temperature on shape-dimensional changes of a 110 type hose coupling, produced from EN AC-AlSi11 alloy with the use of pressure die casting technology. The castings were soaked for 3.5 h at temperatures 460°C, 475°C and 490°C. The verification of shape-dimensional accuracy of the elements after soaking treatment, in relation to raw casting, was carried out by comparing the 3D models received from 3D scanning. Soaking temperature of about 460°C-475°C results in no significant changes in the shapes and dimensions of the castings, or surface defects in the form of blisters, which can be seen at a temperature of 490°C.

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Authors and Affiliations

A. Jarco

Effect of Vanadium Microaddition on the Strength of Low-Carbon Cast Steel at Elevated Temperatures

B.E. Kalandyk Renata E. Zapała P. Pałka
Archives of Foundry Engineering | 2020 | vol. 20 | No 2 | 79-83 | DOI: 10.24425/afe.2020.131306
Keywords Low-carbon cast steel Microaddition elements Mechanical properties at elevated temperatures
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Abstract

The effect of vanadium microaddition on the strength of low-carbon cast steel containing 0.19% C used, among others, for castings of slag ladles was discussed. The tested cast steel was melted under laboratory conditions in a 30 kg capacity induction furnace. Mechanical tests were carried out at 700, 800 and 900°C using an Instron 5566 machine equipped with a heating oven of  2C stability. Non-standard 8- fold samples with a measuring length of 26 mm and a diameter of 3 mm were used for the tests. It has been shown that, compared to cast steel without vanadium microaddition, the introduction of vanadium in an amount of 0.12% to unalloyed, low carbon cast steel had a beneficial effect on the microstructure and properties of this steel not only at ambient temperature but also at elevated temperatures when it promoted an increase in UTS and YS. The highest strength values were obtained in the tested cast steel at 700C with UTS and YS reaching the values of 193 MPa and 187.7 MPa, respectively, against 125 MPa and 82.8 MPa, respectively, obtained without the addition of vanadium. It was also found that with increasing test temperature, the values of UTS and YS were decreasing. The lowest values of UTS and YS obtained at 900°C were 72 MPa and 59.5 MPa, respectively, against 69 MPa and 32.5 MPa, respectively, obtained without the addition of vanadium.

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Authors and Affiliations

B.E. Kalandyk
Renata E. Zapała
ORCID: ORCID
P. Pałka

Crumb rubber geopolymer mortar at elevated temperature exposure

Ahmad Azrem Azmi Mohd Mustafa Al Bakri Abdullah Che Mohd Ruzaidi Ghazali Romisuhani Ahmad Ramadhansyah Putra Jaya Shayfull Zamree Abd Rahim Mohammad A. Almadani Jerzy J. Wysłocki Agata Śliwa Andre Victor Sandu
Archives of Civil Engineering | 2022 | vol. 68 | No 3 | 97-105 | DOI: 10.24425/ace.2022.141875
Keywords fly ash geopolymer crumb rubber elevated temperature exposure
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Abstract

Low calcium fly ash is used as the main material in the mixture and the crumb rubber was used in replacing fine aggregates in geopolymer mortar. Sodium hydroxide (NaOH) and sodium silicate (Na2SiO3) which were high alkaline solution were incorporated as the alkaline solution. The fly ash reacted with the alkaline solution forming alumino-silicate gel that binds the aggregate to produce a geopolymer mortar. The loading of crumb rubber in the fly ash based geopolymer mortar was set at 0% (CRGM-0), 5% (CRGM-5), 10% (CRGM-10), 15% (CRGM-15), and 20% (CRGM-20), respectively. NaOH solution (12M) and Na2SiO3 solution ratio is set constant at 2.5 for all geopolymer mixture and the fly ash to alkali activator ratio was kept at 2.0. The CRGM at 28 days of curing time was exposed to elevated temperature at 200°C, 400°C, 600°C and 800°C. The weight loss of the CRGM increases with increasing temperature at all elevated temperatures. However, the density and compressive strength of CRGM decrease with an increase of crumb rubber loading for all elevated temperature exposure. The compressive strength of CRGM reduced due to the fact that rubber decomposes between 200°C and 600°C thereby creating voids. CRGM-15 and CRGM-20 showed cracks developed with rough surface at 800°C. Image obtained from scanning electron microscope (SEM) showed that, the CRGM changed significantly due to the decomposition of crumb rubber and evaporation of the free water at 400°C, 600°C and 800°C.
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Authors and Affiliations

Ahmad Azrem Azmi
1
ORCID: ORCID
Mohd Mustafa Al Bakri Abdullah
2
ORCID: ORCID
Che Mohd Ruzaidi Ghazali
3
ORCID: ORCID
Romisuhani Ahmad
4
ORCID: ORCID
Ramadhansyah Putra Jaya
4
ORCID: ORCID
Shayfull Zamree Abd Rahim
4
ORCID: ORCID
Mohammad A. Almadani
5
ORCID: ORCID
Jerzy J. Wysłocki
6
ORCID: ORCID
Agata Śliwa
7
ORCID: ORCID
Andre Victor Sandu
8
ORCID: ORCID
  1. Center of Excellence Geopolymer and Green Technology, University Malaysia Perlis (UniMAP), 01000, Kangar, Perlis, Malaysia
  2. Faculty of Chemical Engineering Technology, University Malaysia Perlis (UniMAP), 01000, Kangar, Perlis, Malaysia
  3. Faculty of Ocean Engineering Technology and Informatics, University Malaysia Terengganu, Terengganu, Malaysia
  4. Faculty of Mechanical Engineering Technology, University Malaysia Perlis (UniMAP), 02600, Arau, Perlis, Malaysia
  5. Department of Civil Engineering, Faculty of Engineering – Rabigh Branch, King Abdulaziz University, 21589 Jeddah, Saudi Arabia
  6. Department of Physics, Czestochowa University of Technology, 42-200, Czestochowa, Poland
  7. Division of Materials Processing Technology and Computer Techniques in Materials Science, Silesian University of Technology, 44-100 Gliwice, Poland
  8. Faculty of Material Science and Engineering, Gheorghe Asachi Technical University of Iasi, 41 D. Mangeron St., 700050 Iasi, Romania

Elevated-temperature tensile deformation and fracture behavior of particle-reinforced PM 8009Al matrix composite

Shuang Chen Guoqiang Chen Pingping Gao Chunxuan Liu Anru Wu Lijun Dong Zhonghua Huang Chun Ouyang Hui Zhang
Bulletin of the Polish Academy of Sciences Technical Sciences | 2021 | 69 | 5 | e138846 | DOI: 10.24425/bpasts.2021.138846
Keywords aluminum matrix composite 8009Al alloy elevated-temperature tensile property interface fracture behavior
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Abstract

Tensile tests of 8009Al alloy reinforced with SiC and Al₂O₃ particles fabricated by powder metallurgy (PM) were conducted at temperatures of 250–350°C and strain rates of 0.001–0.1 s⁻¹. The ultimate tensile strength and yield strength of the samples decreased while the temperature and strain rate increased. The elongation slightly decreased at first and then increased with growing temperature because of the medium-temperature brittleness of the alloy matrix. When the strain rate was 0.1 s⁻¹, the elongation of the 8009Al/Al₂O₃ composites always decreased with an increase in temperature because of the poorly coordinated deformation and weak bonding between the matrix and Al₂O₃ particles at such a high strain rate. The work-hardening rates of the composites sharply increased to maxima and then decreased rapidly as the strain increased. Meanwhile, the 8009Al/SiCₚ composites displayed superior UTS, YS, elongation, and work-hardening rates than those of the 8009Al/Al₂O₃ composites under the same conditions. Compared to 8009Al alloys reinforced with spherical Al₂O₃ particle, 8009Al alloys reinforced with irregular SiC particles exhibited a better strengthening effect. The fracture mechanism of the 8009Al/SiCₚ composites was mainly ductile, while that of the 8009Al/Al₂O₃ composites was primarily debonding at the matrix–particle interfaces in a brittle mode.
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Authors and Affiliations

Shuang Chen
1
Guoqiang Chen
1
Pingping Gao
1 2
Chunxuan Liu
2
Anru Wu
1
Lijun Dong
1
Zhonghua Huang
1
Chun Ouyang
1 3 4
Hui Zhang
5
  1. Hunan Provincial Key Laboratory of Vehicle Power and Transmission System, Hunan Institute of Engineering, Xiangtan 411104, China
  2. Hunan Gold Sky Aluminum Industry High-tech Co., Ltd., Changsha 410205, China
  3. School of Material Science and Engineering, Jiangsu University of Science and Technology, Zhenjiang Jiangsu 21200, China
  4. CETC Maritime Electronics Research Institute Co., Ltd., Ningbo Zhejiang 315000, China
  5. College of Materials Science and Engineering, Hunan University, Changsha 410082, China

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