Development of Fly-ash Solidification Material Used by Raw Materials with the Shape Difference as a Civil Engineering Materials

An environmentally friendly method was proposed to prepare mesoporous Mobil Composition of Matter No.48 (MCM-48) using fly ash as the silica source. Silver nanoparticles were infiltrated on MCM-48 facilely by an in situ post-reduction method and evaluated as an effective catalyst for CO oxidation. The as-prepared MCM-48 and Ag/MCM-48 nanoparticles were characterized by XRD, N2 adsorption/desorption, and TEM. Investigations by means of XPS for Ag/MCM-48 were performed in order to illuminate the surface composition of the samples. Studies revealed the strong influence of the loading of Ag nanoparticles on catalysts in the oxidation of CO. CO conversion values for Ag/MCM-48 of 10% and 100% were achieved at temperatures of 220 °C and 270 °C, respectively, indicating that the Ag-decorated MCM-48 catalyst is extremely active for CO oxidation.

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Effect of Fly Ash on Compressive Strength, Drying Shrinkage, and Carbonation Depth of Mortar with Ferronickel-Slag Powder

Applied Sciences ◽

10.3390/app11031037 ◽

2021 ◽

Vol 11 (3) ◽

pp. 1037

Author(s):

Se-Jin Choi ◽

Ji-Hwan Kim ◽

Sung-Ho Bae ◽

Tae-Gue Oh

Keyword(s):

Compressive Strength ◽

Fly Ash ◽

Construction Industry ◽

Bituminous Coal ◽

Raw Materials ◽

Drying Shrinkage ◽

The Other ◽

Test Results ◽

Slag Powder ◽

Ferronickel Slag

In recent years, efforts to reduce greenhouse gas emissions have continued worldwide. In the construction industry, a large amount of CO2 is generated during the production of Portland cement, and various studies are being conducted to reduce the amount of cement and enable the use of cement substitutes. Ferronickel slag is a by-product generated by melting materials such as nickel ore and bituminous coal, which are used as raw materials to produce ferronickel at high temperatures. In this study, we investigated the fluidity, microhydration heat, compressive strength, drying shrinkage, and carbonation characteristics of a ternary cement mortar including ferronickel-slag powder and fly ash. According to the test results, the microhydration heat of the FA20FN00 sample was slightly higher than that of the FA00FN20 sample. The 28-day compressive strength of the FA20FN00 mix was approximately 39.6 MPa, which was higher than that of the other samples, whereas the compressive strength of the FA05FN15 mix including 15% of ferronickel-slag powder was approximately 11.6% lower than that of the FA20FN00 mix. The drying shrinkage of the FA20FN00 sample without ferronickel-slag powder was the highest after 56 days, whereas the FA00FN20 sample without fly ash showed the lowest shrinkage compared to the other mixes.

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The Influence of Cement Substitution by Biomass Fly Ash on the Polymer–Cement Composites Properties

Materials ◽

10.3390/ma14113079 ◽

2021 ◽

Vol 14 (11) ◽

pp. 3079

Author(s):

Beata Jaworska ◽

Dominika Stańczak ◽

Joanna Tarańska ◽

Jerzy Jaworski

Keyword(s):

Fly Ash ◽

Building Materials ◽

Raw Materials ◽

Combustion Process ◽

Biomass Combustion ◽

Cement Composites ◽

Cement Mortars ◽

Mineral Additive ◽

Biomass Fly Ash

The generation of energy for the needs of the population is currently a problem. In consideration of that, the biomass combustion process has started to be implemented as a new source of energy. The dynamic increase in the use of biomass for energy generation also resulted in the formation of waste in the form of fly ash. This paper presents an efficient way to manage this troublesome material in the polymer–cement composites (PCC), which have investigated to a lesser extent. The research outlined in this article consists of the characterization of biomass fly ash (BFA) as well as PCC containing this waste. The characteristics of PCC with BFA after 3, 7, 14, and 28 days of curing were analyzed. Our main findings are that biomass fly ash is suitable as a mineral additive in polymer–cement composites. The most interesting result is that the addition of biomass fly ash did not affect the rheological properties of the polymer–cement mortars, but it especially influenced its compressive strength. Most importantly, our findings can help prevent this byproduct from being placed in landfills, prevent the mining of new raw materials, and promote the manufacture of durable building materials.

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Strength Development and Elemental Distribution of Dolomite/Fly Ash Geopolymer Composite under Elevated Temperature

Materials ◽

10.3390/ma13041015 ◽

2020 ◽

Vol 13 (4) ◽

pp. 1015 ◽

Cited By ~ 4

Author(s):

Emy Aizat Azimi ◽

Mohd Mustafa Al Bakri Abdullah ◽

Petrica Vizureanu ◽

Mohd Arif Anuar Mohd Salleh ◽

Andrei Victor Sandu ◽

...

Keyword(s):

Elevated Temperature ◽

Fly Ash ◽

Portland Cement ◽

Ordinary Portland Cement ◽

Raw Materials ◽

Liquid Sodium ◽

Strength Development ◽

Elemental Distribution ◽

Distribution Analysis ◽

Geopolymer Composites

A geopolymer has been reckoned as a rising technology with huge potential for application across the globe. Dolomite refers to a material that can be used raw in producing geopolymers. Nevertheless, dolomite has slow strength development due to its low reactivity as a geopolymer. In this study, dolomite/fly ash (DFA) geopolymer composites were produced with dolomite, fly ash, sodium hydroxide, and liquid sodium silicate. A compression test was carried out on DFA geopolymers to determine the strength of the composite, while a synchrotron Micro-Xray Fluorescence (Micro-XRF) test was performed to assess the elemental distribution in the geopolymer composite. The temperature applied in this study generated promising properties of DFA geopolymers, especially in strength, which displayed increments up to 74.48 MPa as the optimum value. Heat seemed to enhance the strength development of DFA geopolymer composites. The elemental distribution analysis revealed exceptional outcomes for the composites, particularly exposure up to 400 °C, which signified the homogeneity of the DFA composites. Temperatures exceeding 400 °C accelerated the strength development, thus increasing the strength of the DFA composites. This appears to be unique because the strength of ordinary Portland Cement (OPC) and other geopolymers composed of other raw materials is typically either maintained or decreases due to increased heat.

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Experimental Study on Mechanical Property of Concrete Based on Seawater and Sea Sand

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.641-642.574 ◽

2013 ◽

Vol 641-642 ◽

pp. 574-577 ◽

Cited By ~ 1

Author(s):

Ying Tao Li ◽

Ling Zhou ◽

Mao Jiang ◽

Yu Zhang ◽

Jun Shao

Keyword(s):

Mechanical Property ◽

Experimental Study ◽

Fly Ash ◽

Raw Materials ◽

Growth Trend ◽

Sea Sand ◽

Significant Strength ◽

Dry Conditions ◽

Early Strength ◽

Better Than

In this paper, the mechanical property experiments of concrete based on the seawater and sea sand have been carried in different raw materials preparation and different conservation environments. The results show that the early strength and late strength of concrete based on seawater and sea sand are better than concrete based on freshwater and sand. There is no significant strength decreased for concrete based on seawater and sea sand under accelerated alternating wet and dry conditions. For concrete based on seawater and sea sand mixed with admixture, the downward trend of late strength is significantly delayed, the late strength of concrete based on the seawater and sea sand mixed with slag gets the most obvious growth trend, while the late strength of seawater and sea sand concrete mixed with fly ash gets the largest increment.

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Influence of Fly Ash on Corrosion Resistance of Refractory Forsterite-Spinel Ceramics

Solid State Phenomena ◽

10.4028/www.scientific.net/ssp.325.181 ◽

2021 ◽

Vol 325 ◽

pp. 181-187

Author(s):

Martin Nguyen ◽

Radomír Sokolář

Keyword(s):

Electron Microscopy ◽

Scanning Electron Microscopy ◽

Corrosion Resistance ◽

Fly Ash ◽

Raw Materials ◽

X Ray Diffraction ◽

X Ray ◽

Transition Zones ◽

Refractory Ceramics ◽

Scanning Electron

This article examines the influence of fly ash on corrosion resistance of refractory forsterite-spinel ceramics by molten iron as a corrosive medium. Fly ash in comparison with alumina were used as raw materials and sources of aluminium oxide for synthesis of forsterite-spinel refractory ceramics. Raw materials were milled, mixed in different ratios into two sets of mixtures and sintered at 1550°C for 2 hours. Samples were characterized by X-ray diffraction analysis and thermal dilatometric analysis. Crucibles were then made from the fired ceramic mixtures and fired together with iron at its melting point of 1535°C for 5 hours. The corrosion resistance was evaluated by scanning electron microscopy on the transition zones between iron and ceramics. Mixtures with increased amount of spinel had higher corrosion resistance and mixtures with fly ash were comparable to mixtures with alumina in terms of corrosion resistance and refractory properties.

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Developing Multifunctional/Smart Civil Engineering Materials to Fight Viruses

ACS Sustainable Chemistry & Engineering ◽

10.1021/acssuschemeng.1c07642 ◽

2022 ◽

Author(s):

Siqi Ding ◽

Jialiang Wang ◽

Sufen Dong ◽

Ashraf Ashour ◽

Yan Liu ◽

...

Keyword(s):

Civil Engineering ◽

Engineering Materials

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Monitoring of Chemical Resistance of New Grouting Materials

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.898.27 ◽

2021 ◽

Vol 898 ◽

pp. 27-33

Author(s):

Petr Figala ◽

Rostislav Drochytka ◽

Vit Černý ◽

Radek Hermann ◽

Jiří Kolísko

Keyword(s):

Fly Ash ◽

Chemical Resistance ◽

Raw Materials ◽

Waste Glass ◽

Sulphate Solution ◽

Sulphate Attack ◽

Glass Waste ◽

Foundry Sand ◽

Waste Foundry Sand ◽

Grouting Materials

This paper deals with the study of chemical resistance of new cement-based grout for invert grouting. The aim of this work is to verify new mixtures with specific admixtures. The study monitors resistance to external sulphate attack. Specimens were placed into sulphate solution 29.8 g∙l-1 (44 g∙l-1 Na2SO4) according to DIN19753 standard. Based on the results gained, new mixtures will be designed and optimized by addition of suitable secondary raw materials (fly ash, waste foundry sand, waste glass, waste filers).

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