Study on the flexural properties and fiber‐selection method of fiber‐reinforced geopolymer concrete

Zhao, Chenggong; Wang, Zhiyuan; Wu, Xinrui; Zeng, Xianshuai; Zhu, Zhenyu; Guo, Qiuyu; Zhao, Renda

doi:10.1002/suco.202200503

Cited by 12 publications

(6 citation statements)

References 63 publications

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“…The shrinkage testing and theoretical research are more complex than investigating the mechanical properties of metakaolin-based geopolymers. Numerous studies have found that the mixture ratio (alkali activator content [17,18], slag content [18], fly ash content [19], and water-binder ratio [20]), curing method [17,21], and additives) significantly influences the volume stability of metakaolin-based geopolymers [22]. Fu et al [23] reported that metakaolin can coarsen the pore structure of hardened slag, thereby reducing autogenous and drying shrinkage.…”

Section: Introductionmentioning

confidence: 99%

Effect of Slag on the Strength and Shrinkage Properties of Metakaolin-Based Geopolymers

Zhan

Pan

et al. 2022

Materials

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Metakaolin-based geopolymers possess excellent corrosion and high-temperature resistance, which are advantageous compared to ordinary Portland cement. The addition of slag in metakaolin-based geopolymers is a promising approach to improve their mechanical properties. Thus, this study investigated the effect of slag content on the strength and shrinkage properties of metakaolin-based geopolymers. Increasing the slag content and Na2O content was beneficial to the reaction of alkali-activated metakaolin-based geopolymers, thereby improving their compressive strength and density. After 56 days of aging, a maximum compressive strength of 86.1 MPa was achieved for a metakaolin-based geopolymer with a slag content of 50 mass%. When the Na2O content was 12%, the compressive strength of the metakaolin geopolymers with a slag content of 30% was 42.36% higher than those with a Na2O content of 8%. However, as the slag and alkali contents increased, the reaction rate of the metakaolin-based geopolymers increased, which significantly decreased the porosity, increased the shrinkage, and decreased the volumetric stability of the system. In this paper, in-depth study of the volume stability of alkali-activated metakaolin-based geopolymers plays an important role in further understanding, controlling, and utilizing the deformation behavior of geopolymers.

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Section: Introductionmentioning

confidence: 99%

Effect of Slag on the Strength and Shrinkage Properties of Metakaolin-Based Geopolymers

Zhan

Pan

et al. 2022

Materials

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“…Increasing urbanization, industrialization, and construction needs required by infrastructure projects gradually increase the demand and production of Portland cement (PC) every year. 1 Portland cement, which is the most common binder material used to meet the increasing need for concrete in the world, causes great energy consumption and high CO 2 emissions due to its production method. Each year, approximately 4 billion tons of CO 2 is released into the atmosphere during PC production, and this release corresponds to 5%-7% of total greenhouse gas emissions.…”

Section: Introductionmentioning

confidence: 99%

Novel binder material in geopolymer mortar production: Obsidian stone powder

Kurt

Ustabaş

Cakmak

2023

Structural Concrete

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This paper presents the results of mechanical and micro‐structural properties of geopolymer mortars with obsidian, ground granulated blast furnace slag, and metakaolin. In this study, 13 different combinations were created using 25% by weight of obsidian, blast furnace slag, and metakaolin. Geopolymer mortars were poured at 0.45 water/binder ratio, 12M NaOH concentration, and exposed to thermal cure at 75°C, 90°C, 105°C, and 120°C for 72 h. The flexural and compressive strengths of the mortars were measured and their microstructural properties were analyzed. As a result of the study, the maximum compressive strength was obtained as 93.7 MPa, and the maximum flexural strength was 21.4 MPa. From the results obtained when different combinations are used, it has been observed that the materials work in harmony with each other and the optimum curing temperature is 90°C. Also, scanning electron microscopy (SEM) and EDS analyses indicated that the compact structure of the geopolymer matrix and the Ca/Si ratio are directly proportional to the mechanical strength of the sample. The high wavelength value formed in the main band as a result of Fourier‐transformed infrared spectroscopy (FTIR) analysis shows that the mortars have high mechanical properties.

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“…The demand for concrete is increasing all over the world, and it is expected that this demand will continue in the future. Also, concrete is the second most important material in the word after the water 1,2 . The ordinary Portland cement (OPC) is a binder material of conventional concrete.…”

Section: Introductionmentioning

confidence: 99%

“…Also, concrete is the second most important material in the word after the water. 1,2 The ordinary Portland cement (OPC) is a binder material of conventional concrete. However, the production phase of OPC is a harmful process for global warning.…”

Section: Introductionmentioning

confidence: 99%

Metakaolin‐based geopolymer concretes for nuclear protection: On the perspective of physicochemical, durability, and microstructure

Bayrak

Kaplan

Öz

et al. 2023

Structural Concrete

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As a striking contribution of metakaolin to geopolymer concretes, the varying contents of metakaolin with quartz powder are included the mixtures with ground granulated blast furnace slag, and quartz sand to observe the mechanical, physical, transport, microstructure, and nuclear protection parameters of the samples, within this study. The geopolymer concrete samples are tested for the mechanical transport and physical properties depending on the curing time, curing temperature, and the raw/by‐product material type. The results show that the samples containing the most metakaolin performed well with a 24‐h compressive strength of 131.78 MPa. Increasing the curing temperature and curing time affected both mechanical, physical and transport properties. In addition, the microstructure of the samples was analyzed by scanning electron microscopy, x‐ray diffraction, and Fourier transform infrared spectroscopy. Moreover, the effect of increasing metakaolin reinforcement on the nuclear protection capacity of the produced geopolymer concretes with experimental gamma transmission and neutron dose measurements was investigated. The M3 sample with high content of both metakaolin and granulated blast‐furnace slag showed the highest resistance to gamma photons in the energy range of 0.081–0.383 MeV. The produced geopolymer samples absorbed almost 40% of the fast neutrons with 4.5 MeV energy. Neutron removal cross sections of the produced geopolymer concretes are in the range of 0.0952–0.0949 cm−1 and are larger than those of B4C, graphite, and boric acid. The findings of this study revealed that the addition of metakaolin improved the mechanical, nuclear shielding and structural properties of geopolymer concretes.

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Study on the flexural properties and fiber‐selection method of fiber‐reinforced geopolymer concrete

Cited by 12 publications

References 63 publications

Effect of Slag on the Strength and Shrinkage Properties of Metakaolin-Based Geopolymers

Effect of Slag on the Strength and Shrinkage Properties of Metakaolin-Based Geopolymers

Novel binder material in geopolymer mortar production: Obsidian stone powder

Metakaolin‐based geopolymer concretes for nuclear protection: On the perspective of physicochemical, durability, and microstructure

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