Production of water-permeable ceramic bricks derived from fly ash via a simple pellet method: Mechanism of mechanical strength and permeability

Lv, Ruibin; Liang, Sha; Li, Xilong; Hou, Huijie; Ke, Yan; Li, Xingwu; Tang, Mingliang; Quan, Junda; Yuan, Shushan; Hu, Jingping; Yang, Jiakuan

doi:10.1016/j.conbuildmat.2022.128989

Cited by 3 publications

(1 citation statement)

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“…Permeable materials are a crucial factor of sponge city construction that can help alleviate the problem of urban rainwater drainage and utilization at the source (Yu et al, 2021;Song, 2022;Qi et al, 2023). Water permeable bricks (WPB), as a type of permeable material with high porosity, breathability, and moisture retention that other road paving materials lack Li J. H. et al, 2021;Lv et al, 2022). WPB can infiltrate rainwater into the ground, and there is no obvious runoff in case of rainstorm, achieving the effect of drying when the rain stops.…”

Section: Introductionmentioning

confidence: 99%

Firing mechanism and benefit evaluation of high-strength fired water permeable brick containing vanadium-titanium iron ore tailings

Bao

Jing

et al. 2023

Front. Earth Sci.

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Introduction: The vanadium-titanium iron ore tailings (VTIOTs) has a significant amount of discharge, and serious pollution, which makes it difficult to use directly as a resources resource.Methods: High-strength fired water permeable brick (HSFWPB) was prepared using VTIOTs as the main raw material. The orthogonal test, X-ray diffraction analysis (XRD), scanning electron microscope (SEM), energy dispersive spectrometry (EDS), and synthetic precipitation leaching procedure (SPLP) were obtained to study the basic properties and firing mechanism of HSFWPB containing VTIOTs, and an economic benefit evaluation was conducted on the project investment of HSFWPB containing VTIOTs.Results: The results show that when the content of VTIOTs in HSFWPB is 78%, the firing temperature (FT) is 1080°C and the holding time is 120 min, the compressive strength and permeability coefficient of the fired product reach 70.4 MPa and 0.055 cmˑs−1, respectively, which meet the requirements of Cc60 grade products in Water permeable brick (JC/T 945–2005). The products of HSFWPB containing VTIOTs after firing are diopside (CaMgSi2O6) and augite (Ca (Mg, Fe, Al) (Si, Al)2O6), with the increase of FT and the extension of HT, the low melting point elements of P, Na, K dissolve out, and the content of Fe and Al in the firing products increases, most of Ca2+ in diopside is replaced by Fe3+, so that augite becomes the main crystal phase. With the increase of FT, the pores in the fired products are changed from: closed pores with different sizes→ connected pores with irregular diameters→ irregular collapse pores→ small and uniform circular pores, which provides a guarantee for the permeability of HSFWPB containing VTIOTs.Discussion: The full investment payback period of the project of HSFWPB containing VTIOTs is 1.77 years. When the production reaches 48.585% of the design output, it reaches a breakeven point, and the project has strong risk resistance ability. The research has improved the utilization rate of VTIOTs and provided a new approach for the large-scale application of VTIOTs.

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