Use of fly ash and phosphogypsum for the synthesis of belite-sulfoaluminate clinker

Fly ash and phosphogypsum were used as Naturally Occurring Radioactive Materials (NORM) by-products for the synthesis of belite-sulfoaluminate clinkers. The influence of raw mixture composition and firing temperature was investigated. Clinkers and cements were examined by X-ray powder diffraction and scanning electron microscopy with energy dispersive X-ray spectroscopy. The compressive strength of the cements was determined after 28 days. Clinker phases identified included ye’elimite, ß-phase of belite, ternesite and gehlenite, while the main hydration product of the cement pastes was ettringite. The results showed that belite-sulfoaluminate cements can be fabricated with a compressive strength of 45.9 N/mm2 by firing the raw mixture (70 wt.% marl, 10 wt.% bauxite and 20 wt.% phosphogypsum) at a temperature of 1320°C/1h.

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UTILIZATION OF FLY ASH AND CONCRETE RESIDUE IN THE PRODUCTION OF GEOPOLYMER BRICKS

Journal of Green Building ◽

10.3992/1552-6100.12.1.63 ◽

2017 ◽

Vol 12 (1) ◽

pp. 63-77 ◽

Cited By ~ 1

Author(s):

Siriporn Sirikingkaew ◽

Nuta Supakata

Keyword(s):

Electron Microscopy ◽

Mechanical Properties ◽

Scanning Electron Microscopy ◽

Compressive Strength ◽

Phase Composition ◽

Fly Ash ◽

Industrial Waste ◽

X Ray Diffraction ◽

X Ray ◽

Scanning Electron

This study presents the development of geopolymer bricks synthetized from industrial waste, including fly ash mixed with concrete residue containing aluminosilicate compound. The above two ingredients are mixed according to five ratios: 100:0, 95:5, 90:10, 85:15, and 80:20. The mixture's physico-mechanical properties, in terms of water absorption and the compressive strength of the geopolymer bricks, are investigated according to the TIS 168-2546 standard. Scanning electron microscopy (SEM) and X-ray diffraction (XRD) analyses are used to investigate the microstructure and the elemental and phase composition of the brick specimens. The results indicate that the combination of fly ash and concrete residue represents a suitable approach to brick production, as required by the TIS 168–2546 standard.

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Parametric Strategy for Composite Cement Concrete Blended with Fly Ash & Glass Fiber

Current Journal of Applied Science and Technology ◽

10.9734/cjast/2020/v39i3531065 ◽

2020 ◽

pp. 162-176

Author(s):

Madhurima Das ◽

Siba Prasad Mishra

Keyword(s):

Compressive Strength ◽

Fly Ash ◽

Glass Fiber ◽

Building Materials ◽

Cement Concrete ◽

Strength Performance ◽

X Ray ◽

Natural Building ◽

The Impact ◽

Scanning Electron

Coping with population growth, houses are built to meet the hike. The prerequisites for concrete and steel reinforcements have surged up globally since last 3 to 4decades. Shortage of natural building materials, increased wastes from coal based industries to augment carbon foot print has worried the engineers to reuse their wastes (such as fibres, powders, granules, etc.) as building materials ingredient. Glass fibre has improved flexural capabilities with fly ash dosages in cement concrete and alternately helps in restricting environmental degradation. Present research aims at investigating the impact of glass fiber (at 1%, 2% and 3% addition) and fly ash (dosages of 10% and 20% over the existing fly ash in PPC). The ingredients and microstructure of composites are found by either X-ray fluorescent spectroscopy or scanning electron microscope. Experimental evaluation results of the blended composite concrete parameters of RCC are experimentally evaluated and compared have shown that concrete with 10% cement substitution with fly ash and 3% fibre showed optimum compressive strength performance than the concrete without fibre and fly ash and also chemically resistant against commonly used M-20 grade of Concrete.

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The Filler Effect on Compressive Strength of Sulfur Concrete

Architecture Engineering and Science ◽

10.32629/aes.v2i1.315 ◽

2021 ◽

Vol 2 (1) ◽

Author(s):

Wenwei Lin ◽

Fan Fei ◽

Qunjie Li

Keyword(s):

Compressive Strength ◽

Electron Microscope ◽

Fly Ash ◽

Scanning Electron Microscope ◽

Chemical Reaction ◽

X Ray Diffraction ◽

X Ray ◽

Compressive Performance ◽

Bonding Mode ◽

Scanning Electron

The sulfur concrete samples were prepared by the optimized process, which were mixed with cement, fly ash and slag, respectively. The influence of the type and content of filler on the compressive strength of sulfur concrete was studied. The phase and micromorphology of filler and sulfur mixture were characterized by X-ray diffraction and scanning electron microscope, and the bonding mode was studied. The results show: the cement filler has the best effect on the compressive performance of sulfur concrete,and the compressive strength is 87.2 MPa by adding cement filler with the same quality as sulfur; there is no chemical reaction between filler and sulfur, and the filler is physically bonded to sulfur matrix.

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Fate of the naturally occurring radioactive materials during treatment of acid mine drainage with coal fly ash and aluminium hydroxide

Journal of Environmental Management ◽

10.1016/j.jenvman.2013.11.041 ◽

2014 ◽

Vol 133 ◽

pp. 12-17 ◽

Cited By ~ 14

Author(s):

Godfrey Madzivire ◽

Peane P. Maleka ◽

Viswanath R.K. Vadapalli ◽

Wilson M. Gitari ◽

Robert Lindsay ◽

...

Keyword(s):

Fly Ash ◽

Acid Mine Drainage ◽

Aluminium Hydroxide ◽

Mine Drainage ◽

Coal Fly Ash ◽

Radioactive Materials ◽

Acid Mine ◽

Naturally Occurring ◽

Naturally Occurring Radioactive Materials

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Mineralogical, Microstructural and Compressive Strength Characterization of Fly Ash as Materials in Geopolymer Cement

Elkawnie ◽

10.22373/ekw.v7i1.7787 ◽

2021 ◽

Vol 7 (1) ◽

Author(s):

Cut Rahmawati ◽

Sri Aprilia ◽

Taufiq Saidi ◽

Teuku Budi Aulia

Keyword(s):

Electron Microscopy ◽

Scanning Electron Microscopy ◽

Compressive Strength ◽

Fourier Transform ◽

Fly Ash ◽

X Ray Diffraction ◽

Bending Vibration ◽

X Ray ◽

Geopolymer Cement ◽

Scanning Electron

Abstract: This study was designed to examine the mineral, microstructural, and mechanical strength properties of fly ash and its feasibility as a raw material for geopolymer cement. The study used an experimental method by examining the characteristics of fly ash by X-ray Fluorescence Spectrometer (XRF), Fourier transform infrared (FTIR) spectroscopy, X-ray diffraction (XRD), hydrometer method, Scanning electron microscopy (SEM), and compressive strength testing. For creating the geopolymer cement paste, a concentration of NaOH 10M was used, with a ratio of water/solid = 0.4 and a ratio of Na2SiO3/NaOH = 1 using curring at room temperature. The results showed the geopolymer pastes have a compressive strength of 18.1 MPa and 21.5 MPa after 7 days and 28 days. The XRD results showed a decrease in the peak of 2θ at 26.54° because the amorphous part had transformed into a C-S-H solution in geopolymer cement. This finding was supported by the FTIR spectra results showing Si-O-Si bending vibration and the functional group of AlO2. It showed that Nagan Raya fly ash-based geopolymer is a potential construction material.Abstrak: Penelitian ini dirancang untuk mendapatkan sifat mineral, mikrostruktural, dan kekuatan mekanis dari fly ash serta kesesuaiannya sebagai material dasar pada semen geopolimer. Metode penelitian yang digunakan adalah metode eksperimen dengan cara menguji karakteristik dari fly ash dengan pengujian X-ray Fluorescense Spectrometer (XRF), Fourier transform infrared (FTIR) spectoscopy, X-ray diffraction (XRD), hydrometer method, Scanning electron microscopy (SEM) dan kuat tekan. Untuk pembuatan pasta semen geopolimer digunakan konsentrasi NaOH 10 M, rasio water/solid 0,4 dan rasio Na2SiO3/NaOH = 1 dengan perawatan pada suhu kamar. Hasil menunjukkan setelah 7 hari pasta geopolimer memiliki kuat tekan 18,1 MPa dan 21,5 MPa pada 28 hari. Hasil XRD menunjukkan adanya penurunan puncak 2θ pada 26,54° ini disebabkan karena bagian amorf dari fly ash telah menjadi larutan C-S-H pada semen geopolimer. Hasil ini diperkuat dengan analisis FTIR spectra yang menunjukkan adanya Si-O-Si bending vibration dan gugus fungsi dari AlO2. Hasil menunjukkan fly ash dari Nagan Raya potensial sebagai bahan material konstruksi berbasis geopolimer.

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Test Research on Preparation of New Wall Material with Iron Tailings in Tangshan Area

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.295-297.535 ◽

2011 ◽

Vol 295-297 ◽

pp. 535-538

Author(s):

De Qing Gan ◽

Chao Chen ◽

Jin Xia Zhang

Keyword(s):

Compressive Strength ◽

Electron Microscope ◽

Fly Ash ◽

Wall Material ◽

X Ray Diffraction ◽

Steam Curing ◽

X Ray ◽

A New Technique ◽

Scanning Electron

This paper discussed the experimental resuhs of exploiting brick materials with iron tailing materials in Tanshang area. Through preparation of iron tailing bricks, the technical flow and production proportion was obtained. The results show that a burning-and steam curing-free brick product with a compressive strength of 28.30 MPa and Flexural strength of 5.63 MPa as the following: iron tailing; fly ash; sand; CaO; gypsum; cement. And long-term properties of a burning-and steam curing-flee brick is also studied by experiments in this paper. Put forward a new technique of making materials with iron tailing. At the same time, the micro mechanism of iron tailing brick was also studied with X-Ray Diffraction (XRD) and Scanning Electron Microscope(SEM).

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Properties of Geopolymer Paste from Fly Ash Blended with Metakaolin as Pervious Concrete

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.690.179 ◽

2016 ◽

Vol 690 ◽

pp. 179-186 ◽

Cited By ~ 1

Author(s):

Phachongkit Boonanunwong ◽

Pimpawee Keawpapasson ◽

Chayanee Tippayasam ◽

Parjaree Thavorniti ◽

Prinya Chindaprasirt ◽

...

Keyword(s):

Compressive Strength ◽

Fourier Transform ◽

Fly Ash ◽

Coarse Aggregate ◽

Chemical Compositions ◽

Geopolymer Concrete ◽

X Ray Diffraction ◽

X Ray ◽

Lignite Fly Ash ◽

Scanning Electron

The purpose of this research was to study pervious geopolymer concrete with different amounts of lignite fly ash (F), metakaolin (M), sodium silicate (NS) and 8 mol/L sodium hydroxide (NH) solution. Constant NS/NH ratio of 0.5, three alkali liquid/pozzolan (L/P) ratios viz., 0.5, 0.6 and 0.7 and pozzolan to coarse aggregate ratio of 1:8 were used. The compressive strengths of 50×50×50 mm3 cube specimens were tested at the age of 28 days. In addition, compressive strengths of 100 mm in diameter and 200 mm in height cylindrical specimens were tested at the age of 7, 14, 21 and 28 days. The chemical compositions and microstructures of specimens were characterized by X-Ray Diffraction (XRD) and Scanning Electron Microscope (SEM), respectively.The mixture with 50%F+50%M and L/P ratio of 0.7 was the best proportion for pervious geopolymer concrete according to the compressive strength, good permeability and microstructural images. The bond of Si-O-Al and Si-O-Si characterized by Fourier Transform Infrared Spectroscopy (FTIR) spectra confirmed the developed geopolymeric structure.

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The Preparation and Micro Mechanism of Brick Materials with Iron Tailings in Tanshang Area

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.753-755.572 ◽

2013 ◽

Vol 753-755 ◽

pp. 572-575

Author(s):

Shu Xian Liu ◽

Shao Bo Wei

Keyword(s):

Compressive Strength ◽

Electron Microscope ◽

Fly Ash ◽

Flexural Strength ◽

Scanning Electron Microscope ◽

Steam Curing ◽

X Ray ◽

A New Technique ◽

Scanning Electron

This paper discussed the experimental results of exploiting brick materials with iron tailing materials in Tanshang area. Through preparation of iron tailing bricks, the technical flow and production proportion was obtained. The results show that a burning-and steam curing-free brick product with a compressive strength of 28.30 MPa and Flexural strength of 5.63 MPa as the following: iron tailing; fly ash; sand; CaO; gypsum; cement. And long-term properties of a burning-and steam curing-free brick is also studied by experiments in this paper. Put forward a new technique of making materials with iron tailing. At the same time, the micro mechanism of iron tailing brick was also studied with X-Ray Diffractometer (XRD) and Scanning Electron Microscope (SEM).

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