Mechanism analysis of pore structure and crystalline phase of thermal insulation bricks with high municipal sewage sludge content

Zhou, Wentao; Yang, Fengming; Zhu, Ruijian; Dai, Ge; Wang, Weijie; Wang, Wenlong; Guo, Xinli; Jiang, Jinyang; Wang, Zengmei

doi:10.1016/j.conbuildmat.2020.120021

Cited by 19 publications

(5 citation statements)

References 42 publications

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“…The above results indicated that when the ratio of K-feldspar was fixed at 15 wt%, the mechanical strength of thermal insulation bricks was the highest. With the increase in K-feldspar, thermal conductivity increased from 0.25 W m −1 k −1 to 0.38 W m −1 k −1 , while the water absorption decreased from 45.0% to 28.0%, and this is probably due to the melting of K-feldspar powder, which filled the pores of thermal insulation bricks during the sintering process [24]. With an increase in CaCO 3 from 0% to 20 wt%, compressive strength decreased from 28.4 MPa to 18.0 MPa, and flexural strength almost had no significant correlation (Figure 1a,b).…”

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

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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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%

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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“…Compressive strength is a major characteristic that judges the suitability of a material for use in building applications, serving as a reliable indicator of its quality [48]. Figure 16 illustrates the compressive strengths of different compositions at various firing temperatures.…”

Section: Compressive Strengthmentioning

confidence: 99%

Transforming Zeolite Tuff and Cigarette Waste into Eco-Friendly Ceramic Bricks for Sustainable Construction

Ibrahim,

Basyooni-M. Kabatas,

Móricz

et al. 2024

Buildings

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The use of waste materials has gained attention as a sustainable approach in various industries. Cigarette waste, which is typically discarded as a non-recyclable material, poses a significant environmental challenge due to its toxicity and slow decomposition rate. However, by incorporating this waste into ceramic bricks, new approaches for waste management and resource utilization are explored. This research work provides a detailed evaluation of the possibility of utilizing natural zeolite tuff incorporated with cigarette waste to produce sustainable ceramic bricks. Uniform powders are produced by milling various combinations of zeolitic tuff and cigarette waste using a planetary ball mill. The substitution ratios ranged from 0% to 12% by weight of the zeolitic tuff, with increments of 2%. Ceramic discs were formed by dry pressing and then subjected to sintering at different heat treatment temperatures (950–1250 °C). The impact of the inclusion of cigarette waste on the microstructural and technical features of zeolite tuff-based ceramic bricks has been thoroughly investigated. The results of the experiments demonstrate that incorporating cigarette waste into the development of ceramic bricks leads to improved thermal insulation properties, with thermal conductivity ranging from 0.33 to 0.93 W/m·K. Additionally, these bricks exhibit a lighter weight in a range of 1.45 to 1.96 g/cm3. Although the inclusion of cigarette waste slightly reduces the compressive strength, with values ranging from 6.96 to 58.6 MPa, it still falls within the acceptable range specified by standards. The inclusion of cigarette waste into zeolite tuff is an innovative approach and sustainable practice for reducing energy consumption in buildings while simultaneously addressing the issue of waste disposal and pollution mitigation.

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“…It is worth noting that the direct incineration of sewage sludge will cause serious corrosion to the equipment, and especially the incineration of high-water sludge will consume a lot of energy [15][16][17]. In addition, sludge incineration will also cause the enrichment of heavy metals in dust and secondary pollution, and the sludge residue of combustion is directly accumulated or buried, which seriously pollutes the surrounding soil [18,19]. However, the content of Al 2 O 3 and SiO 2 in sewage sludge and its calcination residue is high, which can be used as additives for ceramic materials [20][21][22][23].…”

Section: Introductionmentioning

confidence: 99%

“…For example, Tian et al [30] used sewage sludge to prepare novel glass-ceramics through the microwave heating method, which can not only reduce energy consumption, but also significantly improve the structure and performance of ceramics. Zhou et al [19] proposed a production method of porous thermal insulation bricks based on municipal sewage sludge to implement the reuse of solid waste and found that excessive municipal sewage sludge would result in the deterioration of brick strength. Chen et al [17] developed porous ceramsites with good adsorption performance for Pb (II) by using co-combustion ash of various solid wastes containing sewage sludge, which could effectively treat Pb (II) polluted wastewater.…”

Section: Introductionmentioning

confidence: 99%

Effect of Sewage Sludge Addition on Microstructure and Mechanical Properties of Kaolin-Sewage Sludge Ceramic Bricks

Zhang

Jiao

et al. 2022

Coatings

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The dramatic increase in sewage sludge production requires researchers to develop and explore more commercially viable ways for alleviating current environmental and socioeconomic challenges connected with its routine management. It has been established that sewage sludge can be processed to fabricate various valuable products or as fuels for electricity generation. In this research, kaolin (calcined from coal gangue) and sewage sludge were successfully used to prepare porous ceramic bricks without any additives. The effect of sewage sludge on the microstructure, phase composition, and mechanical properties of kaolin-sewage sludge ceramic bricks was investigated. The results show that the kaolin-sewage sludge ceramic bricks are mainly composed of mullite (3Al2O3·2SiO2), sillimanite (Al2SiO5), aluminum phosphate (AlPO4), hematite (Fe2O3) as well as a small amount of quartz (SiO2). The ceramic bricks present a typical porous structure, and the number and size of micropores increases noticeably with the increase of sewage sludge content. The sintering shrinkage rate and porosity of ceramic bricks increased significantly with the increase of sewage sludge content, which is mainly attributed to the increase of liquid phase proportion and high temperature volatilization. Sewage sludge can significantly improve the mechanical properties of kaolin-sewage sludge ceramic bricks. When the sewage sludge content is 30 wt.%, the ceramic bricks present the maximum compressive strength and flexural strength and high porosity (32.74%). The maximum sintering shrinkage rate and porosity are 12.17% and 40.51%, respectively.

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Mechanism analysis of pore structure and crystalline phase of thermal insulation bricks with high municipal sewage sludge content

Cited by 19 publications

References 42 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

Transforming Zeolite Tuff and Cigarette Waste into Eco-Friendly Ceramic Bricks for Sustainable Construction

Effect of Sewage Sludge Addition on Microstructure and Mechanical Properties of Kaolin-Sewage Sludge Ceramic Bricks

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