Preparation of water-permeable bricks derived from fly ash by autoclaving

Li, Jiahao; Li, Xilong; Liang, Sha; Zhang, Yuanshang; Ye, Qiang; Zhang, Li; Pan, Chaoqun; Lv, Ruibin; Li, Qingyi; Xiao, Keke; Yan, Yilei; Chen, Ye; Hu, Jingping; Hou, Huijie; Yang, Jiakuan

doi:10.1016/j.conbuildmat.2020.121556

Cited by 15 publications

(7 citation statements)

References 29 publications

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“…In addition, the content of K 2 O in K-feldspar was the highest (8.86%), which could play a fluxing role during the sintering process [23]. Among these three materials, coal gangue and fly ash had higher contents of Fe 2 O 3 (6.16% and 8.80%, respectively) than K-feldspar (2.64%), because the former two are by-products of coal mining and coal combustion industries, respectively, and there was a large amount of Fe in coal [19]. The performances of thermal insulation bricks produced under different ratios of K-feldspar and CaCO 3 were tested (Figure 1).…”

Section: K-feldspar Promotes the Conversion Of Caco 3 To Ca-feldsparmentioning

confidence: 99%

“…In the compressive strength test, the insulated brick was placed perpendicular to the pressurized surface at the center of the press machine (JIANYI TYE-20B), and pressure was loaded smoothly and uniformly at a rate of 5 kN s −1 until the brick was crushed. The maximum fracture load was recorded, and compressive strength was calculated according to the following formula [19]:…”

Section: Performance Testing Of Coal-gangue-based Thermal Insulation ...mentioning

confidence: 99%

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Newly Generated Ca-Feldspar during Sintering Processes Enhances the Mechanical Strength of Coal Gangue-Based Insulation Bricks

Zheng,

Cui,

Gao

et al. 2023

Materials

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Coal gangue is a solid waste with low carbon content discharged during the course of the coal mining process. The resource utilization of coal gangue could solve environmental problems caused by its excessive production, such as soil contamination and land occupation. This study proposed to produce high-strength thermal insulation bricks using coal gangue as the primary material and three other mineral powders as auxiliary materials, including K-feldspar, CaCO3 and fly ash. A systematic analysis was conducted to explore the optimum raw material addition ratio and optimum sintering temperature; then, the intrinsic structure of thermal insulation bricks and their sintering formation mechanisms were revealed. The results showed that the optimal ratios of coal gangue, K-feldspar, CaCO3 and fly ash were 65 wt%, 15 wt%, 10 wt% and 10 wt%, respectively; the compressive strength of the thermal insulation brick produced under this ratio was 22.5 MPa; thermal conductivity was 0.39 W m−1 k−1. During sintering processes, mineral powders sufficiently fused to form a skeleton, and the CO2 derived from CaCO3 formed pores. The optimum sintering temperature was 1150 °C, because at this temperature, K-feldspar had the best effect in promoting the conversion of CaCO3 to Ca-feldspar. The high level of the relative crystallinity of Ca-feldspar (about 76.0%) helped raise the Si–O network’s polymerization degree (NBO/T = 1.24), finally raising the compressive strength of thermal insulation bricks. The innovative method of using coal gangue to make thermal insulation bricks not only solved the environmental pollution caused by coal gangue but also provided excellent construction materials with high practical application value.

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Section: K-feldspar Promotes the Conversion Of Caco 3 To Ca-feldsparmentioning

confidence: 99%

Section: Performance Testing Of Coal-gangue-based Thermal Insulation ...mentioning

confidence: 99%

Newly Generated Ca-Feldspar during Sintering Processes Enhances the Mechanical Strength of Coal Gangue-Based Insulation Bricks

Zheng,

Cui,

Gao

et al. 2023

Materials

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“…Liu et al 18 successfully prepared permeable bricks using metallurgical solid waste. Li et al 19 used fly ash as the main raw material to prepare permeable bricks with a water permeability coefficient of 1.044 × 10 −2 cm/s by autoclaving. Compared with the permeable bricks prepared by autoclaving and curing, those prepared by sintering exhibited higher permeability and better mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

“…successfully prepared permeable bricks using metallurgical solid waste. Li et al 19 . used fly ash as the main raw material to prepare permeable bricks with a water permeability coefficient of 1.044 × 10 −2 cm/s by autoclaving.…”

Section: Introductionmentioning

confidence: 99%

Recycling of granite waste and burnt coal cinder for the preparation of sintered permeable bricks

Gui

Huang

Luo

et al. 2023

Int J Applied Ceramic Tech

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The sintered permeable brick was prepared using granite waste and burnt coal cinder (BCC) as raw materials to ensure the utmost utilization of both solid wastes. The effect of various parameters, such as the proportion of raw materials, granite particle size and sintering temperatures on the properties of the permeable brick were studied, and the relevant sintering mechanism was clarified. The differential scanning calorimetry curves indicate that the mixture of granite waste and BCC begins to melt at a lower temperature, which is lower than the temperature for melting them alone, so the use of them to prepare sintered bricks will reduce energy consumption. The optimal conditions for the preparation of the permeable bricks were determined as the mass ratio of granite waste to BCC of 80: 20, sintering temperature of 1150–1175°C, and granite particle size of .9–1.25 mm. It was found that the permeability and the flexural strength of the samples can reach 3.41 × 10 −2 cm/s and 4.2 MPa, respectively, which both exceed the requirements specified in the national standard of China.

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“…In the literature are known modifications of silica-lime products based on various types of waste [20,[24][25][26][27][28][29][30]. Waste materials have been often utilised as substitutes for aggregate in conventional products.…”

Section: Introductionmentioning

confidence: 99%

Utilization of Waste Glass in Autoclaved Silica–Lime Materials

Borek

Czapik

2022

Materials

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This paper aims to investigate the possibility of using waste glass of different colours as a complete substitute for quartz sand in autoclaved silica–lime samples. On the one hand, this increases the possibility of recycling waste glass; on the other hand, it allows obtaining autoclaved materials with better properties. In this research, reference samples with quartz sand (R) and white (WG), brown (BG), and green (GG) waste container glass were made. Parameters such as compressive strength, bulk density, and water absorption were examined on all samples. The samples were examined using a scanning electron microscope with an energy dispersive spectroscopy detector (SEM/EDS) and subjected to X-ray diffraction (XRD) analysis. The WG samples showed 187% higher compressive strength, BG by 159%, and GG by 134% compared to sample R. In comparison to the reference sample, volumetric density was 16.8% lower for sample WG, 13.2% lower for BG, and 7.1% lower for GG. Water absorption increased as bulk density decreased. The WG sample achieved the highest water absorption value, 15.84%. An X-ray diffraction analysis confirmed the presence of calcite, portlandite, and tobermorite phases. Depending on the silica aggregate used, there were differences in phase composition linked to compressive strength. Hydrated calcium silicates with varying crystallisation degrees were visible in the microstructure image.

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Preparation of water-permeable bricks derived from fly ash by autoclaving

Cited by 15 publications

References 29 publications

Newly Generated Ca-Feldspar during Sintering Processes Enhances the Mechanical Strength of Coal Gangue-Based Insulation Bricks

Newly Generated Ca-Feldspar during Sintering Processes Enhances the Mechanical Strength of Coal Gangue-Based Insulation Bricks

Recycling of granite waste and burnt coal cinder for the preparation of sintered permeable bricks

Utilization of Waste Glass in Autoclaved Silica–Lime Materials

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