Influence of self-ignition coal gangue on properties of foam concrete with steam curing

Ye, Bin; Ren, Guosheng; Huang, Jinjie; Gao, Xiaojian

doi:10.1016/j.cscm.2022.e01316

Cited by 6 publications

(3 citation statements)

References 35 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Researchers separately added activated CG, 1 calcined CG, 69,70 and natural CG [71][72][73] into Portland cement and found that Portland cement with activated CG had a higher capillary pore content than cement containing fly ash, whereas its strength and shrinkage values were lower. The gel porosity of a CG composite and that of fly ash composite are obviously higher than that of ordinary paste, and the micro-and macropore sizes are larger than those of ordinary paste.…”

Section: Cement-based Porous Materialsmentioning

confidence: 99%

Fabrication and application of porous materials made from coal gangue: A review

Shao

Zheng

et al. 2023

Int J Applied Ceramic Tech

View full text Add to dashboard Cite

Coal gangue (CG), which is mainly generated during coal excavation, mining, and coal washing, is an industrial solid waste that is recognized as an environmental pollutant. The ever‐increasing amount of CG produced is a serious threat to the ecological environment and property safety, especially in China, which is the largest coal producer and consumer in the world. Considerable studies have investigated means for utilizing CG worldwide. This review summarizes and discusses various porous inorganic materials made from CG, including cement‐based porous materials, porous bricks, porous ceramics (cordierite and mullite) and glasses, porous geopolymers, zeolites, aerogels, and porous carbon materials. Different preparation processes and performances of each type of porous inorganic materials were reviewed. Porous CG‐based materials can be used as promising adsorbents for the removal of various pollutants and have good potential for use in construction industry as well as catalyst material applications. Besides, porous materials obtained from CG have also been tested as slow‐release fertilizers after the absorption of phosphate, as electrode materials, and as oil‐in‐water separation agents. The systematic summary of porous materials based on CG aims at promoting high‐value‐added applications for this waste. Future research directions for the use of CG as a raw material are also presented.

show abstract

Section: Cement-based Porous Materialsmentioning

confidence: 99%

Fabrication and application of porous materials made from coal gangue: A review

Shao

Zheng

et al. 2023

Int J Applied Ceramic Tech

View full text Add to dashboard Cite

show abstract

“…Thermal conductivities of 0.04~0.06 W/(m•K) could be obtained at 88.5~95.4% porosity, but high porosity means a low content of the solid phase in foamed concrete and a low heat capacity, thus weakening the thermal comfort of indoor building and the mechanical strength [15]. To improve the mechanical strength and reduce the thermal conductivity of foamed concrete, many approaches have been conducted and investigated, as shown in Table 1 [16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34]; however, these approaches could not significantly enhance insulation performance under suitable mechanical strength [35,36]. Other approaches were also developed under the suitable content of the cement matrix (suitable dry density).…”

Section: Introductionmentioning

confidence: 99%

Pore Structure, Hardened Performance and Sandwich Wallboard Application of Construction and Demolition Waste Residue Soil Recycled Foamed Concrete

Yang,

Jin

et al. 2024

Sustainability

View full text Add to dashboard Cite

Construction and demolition waste residue soil (CDWRS) recycled foamed concretes were prepared by introducing the original CDWRS into modified binders. Pore structure, hardened performance, and sandwich wallboard application were also investigated. The results indicated that 51 kg/m3 of water glass and 7.5 kg/m3 of gypsum could significantly increase the strength and generate a slight influence on the thermal insulation performance of CDWRS recycled foamed concrete. The largest enhancing rate of 28-day compressive strength at a density of 600 kg/m3 could reach 205.5%. Foamed concrete with 1126 kg/m3 of CDWRS, modified with water glass and gypsum, showed a low thermal conductivity of 0.11 W/(m·K) and a dry density of 626 kg/m3. In total, 988 kg/m3 of CDWRS in foamed concrete led to a compressive strength of 7.76 MPa, a thermal conductivity of 0.14 W/(m·K), and a dry density of 948 kg/m3. Utilization of the foamed concrete in the sandwich structure could fabricate energy-saving wallboards with a minimum heat transfer coefficient of 0.75 W/(m2·K) and a relatively high compressive strength of 16.5 MPa, providing great confidence of CDWRS consumption in the building energy-saving field.

show abstract

“…The main pore structure parameters of FC are porosity, average pore size, pore size distribution, roundness value. However, FC suffers from low strength, cracking, high water absorption and drying shrinkage due to the presence of uniform porous structure and lack of coarse aggregates [17,18]. In FC, the addition of three-dimensional randomly distributed fibers can change the typical brittle behavior into an elastic-plastic one, thus improving the compressive strength, tensile strength and ductility of FC.…”

Section: Introductionmentioning

confidence: 99%

Experimental study on pore structure characteristics and thermal conductivity of fibers reinforced foamed concrete

Li,

Wang,

Wang

et al. 2023

PLoS ONE

View full text Add to dashboard Cite

The pore structure characteristics and thermal conductivity of foamed concrete (FC) reinforced with glass fibers (GF), polyvinyl alcohol fibers (PVAF) and polypropylene fibers (PPF) were investigated experimentally in this article. Firstly, GF, PVAF or PPF with different mass fractions (0%, 1%, 1.5% and 2%) were added to the Portland cement, fly ash and plant protein foaming agent to prepare the FC. Then, SEM tests, dry density tests, porosity tests, and thermal conductivity tests were carried out on FRFC. Later, the adhesion of GF, PVAF and FFF with different mass fractions to the cementitious base was investigated by SEM images of FRFC. The pore size distribution, shape factor and porosity of FRFC were analyzed using Photoshop software and Image Pro Plus (IPP) software. Finally, the effects of different mass fractions and lengths of three types of fibers on the thermal conductivity of FRFC were discussed. The results indicated that proper fiber mass fraction can play a role of refining small pores and separating large pores, improving the structural compactness, reducing the pore collapse phenomenon and optimizing the pore structure of FRFC. The three types of fibers can promote the optimization of cellular roundness and increase the proportion of pores with diameters below 400 μm. The FC with larger porosity had smaller dry density. As the fiber mass fraction increased, the thermal conductivity performed a phenomenon of first decrease and then increase. The three types of fibers with 1% mass fraction achieved relatively low thermal conductivity. Compared with the FC without fibers, the thermal conductivities of GF reinforced FC, PVAF reinforced FC and PPF reinforced FC with 1% mass fraction were decreased by 20.73%, 18.23% and 7.00%, respectively.

show abstract

Influence of self-ignition coal gangue on properties of foam concrete with steam curing

Cited by 6 publications

References 35 publications

Fabrication and application of porous materials made from coal gangue: A review

Fabrication and application of porous materials made from coal gangue: A review

Pore Structure, Hardened Performance and Sandwich Wallboard Application of Construction and Demolition Waste Residue Soil Recycled Foamed Concrete

Experimental study on pore structure characteristics and thermal conductivity of fibers reinforced foamed concrete

Contact Info

Product

Resources

About