The performances of the baking-free bricks of non-sintered wrap-shell lightweight aggregates from dredged sediments

Peng, Yuzhou; Peng, Xiao; Yang, Mao; Shi, Haoliang; Wang, Wangcheng; Tang, Xuechen; Wu, Yan

doi:10.1016/j.conbuildmat.2019.117587

Cited by 28 publications

(4 citation statements)

References 22 publications

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“…Dredged sediments are thermally or chemically pretreated [98], or sieved for coarser fractions [20] to overcome these issues. A hightemperature thermal treatment (>1100°C) produces synthetic lightweight aggregates to make structural lightweight concretes [99][100][101][102]. Overall, sand substitution is usually between 10 and 20 wt.% and can rise to 100 wt.% (up to 95 wt.% of the total of the mix) for structures with low loading.…”

Section: Integration Of Contaminated Sediments In Circular Economymentioning

confidence: 99%

Stabilization/solidification of sediments: challenges and novelties

Elghali¹,

Benzaazoua

Couvidat

et al. 2022

Low Carbon Stabilization and Solidification of Hazardous Wastes

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Section: Integration Of Contaminated Sediments In Circular Economymentioning

confidence: 99%

Stabilization/solidification of sediments: challenges and novelties

Elghali¹,

Benzaazoua

Couvidat

et al. 2022

Low Carbon Stabilization and Solidification of Hazardous Wastes

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“…These results indicated that the forming pressure could tremendously affect the compressive strength of geopolymer bricks. Thus, we inferred that a higher forming pressure made the bricks denser and then eventually increased the density and the compressive strength [11,34].…”

Section: Effect Of Forming Pressurementioning

confidence: 99%

“…For the reasons mentioned above, to improve the conventional fabrication of bricks, various innovative types of utilization by new raw materials and in non-fired treatments have been proposed in studies recently [4][5][6][7][8]. According to the modus, they can be classified into two primary technologies: the high-pressure pressforming method [9][10][11][12] and the injection molding method [13][14][15][16]. Although these two methods can decrease greenhouse gas emissions, they still bring on high production costs and considerable energy consumption.…”

Section: Introductionmentioning

confidence: 99%

Feasibility Study on Fabrication of Geopolymer Bricks by Wasted Grinding Wheel at Room Temperature

Hsieh¹,

Cheng²,

Wu³

2020

Journal of Renewable Materials

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In this study, the feasibility of producing eco-friendly bricks by using geopolymer technology and a waste grinding wheel (WGW) from the grinding wheel industries was investigated. Nowadays, in order to meet industrial needs, for instance, in Taiwan, approximately 500,000 grinding wheels are used annually. That is, a large number of "waste" grinding wheels are produced. Furthermore, few studies have been conducted on the use of WGWs as raw materials in geopolymer applications. The use of geopolymer technology to form bricks can avoid the utilization of clay and cement and even prevent the use of a high-temperature process in kilns. Moreover, it can decrease CO 2 emission and energy consumption and thus, protect the environment. In this study, the following three major factors were considered: press-forming pressure (70 and 100 kgf/cm 2 ), NaOH molar concentration (2 and 4M), and the ratio of binder fineaggregate (1:3, 1:4, and 1:5). Under these conditions, the specimens were tested using the compressive strength test, water absorption test, microstructure analysis, a freezing-thawing test and toxicity characteristic leaching procedure test. The optimal formulation was composed of 1:4 binder fine-aggregate ratio, 4M NaOH concentration, and 100-kgf/cm 2 pressure. Furthermore, we used a WGW and achieved a compressive strength of 50.6 MPa after 28 days, which was greater than 32 MPa and conformed to the Grade A brick standard of National Standards of the Republic of China (13295). In conclusion, this brick fabrication method based on geopolymer technology was not only beneficial to the environment but also improved the efficiency of reutilizing WGW.

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“…Solid waste material (SWM) recycling pays more attention to resource utilization and harmlessness in the whole recycling process (Mohammad et al, 2020;Soliman and Moustafa, 2020;Tsai et al, 2021). In addition, a number of legal regulations ensure further reduction of environmental and ecological damage (Khodier et al, 2021;Peng et al, 2020;Vijayan and Parthiban, 2020). Higher environmental protection requirements are put forward for reuse of riverway silt and sediment, as the traditional reuse methods for farmland composting and dredging ll soil is hard to follow the recycling, reuse, and reduction (3Rs) concept (Razzaq et al, 2021;Vsevolod et al,2017;Wu et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

Solid waste material reuse analysis: filling the road subgrade with riverway silt and sediment

Wang

Kong

Tseng

et al. 2022

Environ Sci Pollut Res

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This study proposes to explore solid waste material (SWM) reuse with the riverway silt and sediment, and examines the impacts of chemical composition on the road construction through sensitivity analysis. Considering the characteristics of silt mixture, it is necessary to investigate the modi ed materials to improve the mechanical feasibility for subgrade lling. In this study, modi cation schemes for construction waste and garbage slag presented well mechanical properties and environmental bene ts in sensitivity analysis, especially for the high-water content silt modi ed by the garbage slag and lime mixture. The results indicate the lime-improved silt with medium water content is a cheap and highperformance material compared to the original silt. Moreover, modi ed silt demonstrated superior features in particle size, permeability and bearing capacity. Among six lime-improving schemes, the California bearer ratio (CBR 2.5 ) increased from 7.1 to 19.6, while the minimum CBR 2.5 was 2.45 times to the original silt. At last, this study proposes the engineering measures to improve the silt mixture subgrade to prevent heavy metals from polluting the water and soil environment. Further implications were also discussed.

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The performances of the baking-free bricks of non-sintered wrap-shell lightweight aggregates from dredged sediments

Cited by 28 publications

References 22 publications

Stabilization/solidification of sediments: challenges and novelties

Stabilization/solidification of sediments: challenges and novelties

Feasibility Study on Fabrication of Geopolymer Bricks by Wasted Grinding Wheel at Room Temperature

Solid waste material reuse analysis: filling the road subgrade with riverway silt and sediment

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