STRATEGIC MANAGEMENT OF SECONDARY RAW MATERIALS - FLY ASH UTILIZATION IN ROAD CONSTRUCTION

2011 ◽  
Author(s):  
Ferat Krasniqi
Keyword(s):  
Fly Ash ◽  
Strategic Management ◽  
Raw Materials ◽  
Road Construction ◽  
Secondary Raw Materials ◽  
Fly Ash Utilization

Porosity Evaluation of Alternative Materials Based on Portland Cement

2014 ◽  
Vol 1000 ◽  
pp. 314-317 ◽  
Author(s):  
Ladislav Pařízek ◽  
Eva Bartoníčková ◽  
Vlastimil Bílek Jr. ◽  
Jiří Kratochvíl
Keyword(s):  
Fly Ash ◽  
Portland Cement ◽  
Coal Combustion ◽  
Mercury Intrusion Porosimetry ◽  
Raw Materials ◽  
High Energy ◽  
Energy Requirements ◽  
Mercury Intrusion ◽  
Secondary Raw Materials ◽  
Alternative Materials

High energy requirements and the resulting economic demands due to the production of Portland cement leads to tendency to replace a portion of cement with secondary raw materials or to use other alternative binders. Among the commonly used cements replacements is currently fly ash which is produced during the coal combustion. In this paper the influence of cement/ash ratio in a paste on paste’s porosity is investigated using mercury intrusion porosimetry.

A NEW KIND OF CEMENT AS A SOLUTION TO THE ENVIRONMENTAL CHALLENGES OF MODERNITY

2021 ◽  
Author(s):  
G Kasimova
Keyword(s):  
Fly Ash ◽  
High Strength Concrete ◽  
Fresh Concrete ◽  
Raw Materials ◽  
Road Construction ◽  
High Strength ◽  
Strength Concrete ◽  
Cement Replacement ◽  
Air Content ◽  
Concrete Mix

The article presents studies on the production of high-strength concrete for road construction for a given 28-day strength on local raw materials. As a cement-replacement additive, fly ash was used. It was found out that the fresh concrete mixture had adequate workability, the air content of the concrete mix withthe sperplastifizer, the 28-day strength of the base mixture, which corresponded to the required strength.

Silicate Sprayed Mixture Based on Secondary Raw Materials

2019 ◽  
Vol 808 ◽  
pp. 129-135
Author(s):  
Petr Figala ◽  
Rostislav Drochytka ◽  
Radek Hermann ◽  
Jiří Kolísko
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
High Temperature ◽  
Fly Ash ◽  
Raw Materials ◽  
Positive Influence ◽  
Foundry Sand ◽  
Secondary Raw Materials ◽  
Fundamental Research

This paper studies the fundamental research and development of sprayed cement-based mixture designed to withstand the chemically aggressive conditions. The aim of this paper is to verify the possibilities of usage of suitable secondary raw materials as a substitution of a binder and filler of the original mixture while preserving or improving the physical-mechanical properties. In this part of the research was studied the possibility to substitute the binder in rate of 20-60 wt.% by high temperature fly ash and the whole filler by foundry sand and slag. Test samples were made from nine recipes, in which was monitored the influence of secondary raw materials on the compressive strength and the water absorption after 28 days of curing. The results of this paper show, it is possible to successfully substitute part of the binder by high temperature fly ash and the filler wholly by foundry sand in the sprayed mixture. These optimized recipes showed positive influence mainly in the long-term on mechanical properties.

scholarly journals Possibilities of Use of Isothermal and Isoperibolic Calorimetry to Study the Effect of Zinc on Hydration of Cement Blended with Fly Ash

2020 ◽  
Author(s):  
Pavel Šiler ◽  
Iva Kolářová ◽  
Rdoslav Novotný ◽  
Jiří Másilko ◽  
Jan Bednárek ◽  
...  
Keyword(s):  
Fly Ash ◽  
Alternative Fuels ◽  
Raw Materials ◽  
Alternative Fuel ◽  
Zinc Ions ◽  
X Ray Diffraction ◽  
X Ray ◽  
Secondary Raw Materials ◽  
Isoperibolic Calorimetry ◽  
Poorly Soluble

Increasing utilization of secondary raw materials and alternative fuels results in increasing contents of metals in cements. One of elements, the content of which keeps rising in cement is zinc. It comes to cement with secondary raw materials such as slag or fly ash or by the utilization of used tires as an alternative fuel. Zinc ions significantly prolong the hydration process in cement. This work deals with the influence of zinc ions in the form of very poorly soluble ZnO salt and easily soluble ZnCl2 and Zn(NO)3 on the hydration of cement blended with fly ash. Zinc was dosed in the range of 0.05, 0.1, 0.5 a 1% of cement weight. Final products were next analyzed using X-Ray Diffraction.

Development of Ultra High Performance Concrete Using Fly Ash

2020 ◽  
Vol 987 ◽  
pp. 33-38
Author(s):  
Rudolf Hela ◽  
Lenka Bodnárová
Keyword(s):  
Compressive Strength ◽  
Fly Ash ◽  
Experimental Work ◽  
High Performance ◽  
High Performance Concrete ◽  
Raw Materials ◽  
Economic Cost ◽  
Ultra High Performance Concrete ◽  
Secondary Raw Materials ◽  
Successful Design

The experimental work presented in this article examines the possibility of lowering the economic cost of UHPC. The UHPC were designed using the Linear Packing Density Model. After 7 days, the UHPC compressive strength exceeded 120 MPa. Level of compressive strength after 90 days reaching 150 MPa had been obtained with a lower dose of cement (700 kg/m3) and with the use of secondary raw materials (fly ash), without the use of dispersed reinforcement. The successful design and production proved that the use of secondary raw materials is possible, thereby decreasing the economic cost of UHPC production.

Preparation and Properties of Pressed Metakaolin and Fly Ash Based Alkali-Activated Binders

2014 ◽  
Vol 897 ◽  
pp. 65-68 ◽  
Author(s):  
Jana Boháčová ◽  
Stanislav Staněk ◽  
Pavel Mec
Keyword(s):  
Tensile Strength ◽  
Fly Ash ◽  
High Temperatures ◽  
Frost Resistance ◽  
Raw Materials ◽  
Fly Ashes ◽  
Secondary Raw Materials ◽  
Alkali Activated Binders ◽  
Alkali Activated

Metakaolin, fly ashes and other secondary raw materials serves as suitable input in preparation of alkali-activated binders. This work deals with preparation of alkali-activated materials based on metakaoline and fly ash. Mixtures were prepared with a minimum of mixture water, ready for pressing. Prepared specimens were tested for tensile strength and pressure strength, resistance to high temperatures, frost resistance and resistance to water and salt.

scholarly journals Editorial for Special Issue “Minerals and Elements from Fly Ash and Bottom Ash as a Source of Secondary Raw Materials”

Minerals ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 438
Author(s):  
Alexandra Guedes ◽  
Bruno Valentim
Keyword(s):  
Fly Ash ◽  
Raw Materials ◽  
Bottom Ash ◽  
Resource Efficiency ◽  
Special Issue ◽  
Secondary Raw Materials ◽  
Alternative Materials

The sustainability of primary resources depends on recycling, resource efficiency and the search for alternative materials [...]

The Influence of Particle Size of Cement and Different Additives on the Properties of Portland Cement Pastes

2016 ◽  
Vol 851 ◽  
pp. 104-109 ◽  
Author(s):  
Pavel Šiler ◽  
Iva Kolářová ◽  
Tomáš Sehnal ◽  
Roman Snop ◽  
Tomáš Opravil ◽  
...  
Keyword(s):  
Particle Size ◽  
Fly Ash ◽  
Portland Cement ◽  
Raw Materials ◽  
Cement Pastes ◽  
Secondary Raw Materials ◽  
Granulated Blast Furnace Slag ◽  
Concrete Production ◽  
Effect Of Particle Size ◽  
Effective Use

The consumption of concrete as a building material is still increasing over the world. Concrete production is closely associated with CO2 and other greenhouse gases emissions. The reduction of these emissions can be achieved by a higher utilization of secondary raw materials in cement mixtures. Particle size is an important factor for more effective use of these materials. This work is focused on the calorimetric determination of the effect of particle size of cement, finely ground granulated blast furnace slag (GBFS), high-temperature fly ash (FA) and fluidized fly ash (FFA) on the Portland cement hydration. Effect of particle size on the hydration of pure cement pastes and pastes with the addition of secondary raw materials is monitored by isoperibolic calorimetry. Other part of this work is aimed on the mechanical properties of resulting materials. The flexural strength and compressive strength were observed after 1, 7 and 28 days of curing.

scholarly journals Fly ash as the component of composites materials

2012 ◽  
Vol 14 (4) ◽  
pp. 53-56
Author(s):  
M. Prascakova ◽  
M. Kusnierova ◽  
V. Cablik ◽  
A. Jarosiński
Keyword(s):  
Fly Ash ◽  
Ceramic Industry ◽  
Raw Materials ◽  
Mineralogical Composition ◽  
Anthropogenic Activity ◽  
Materials Synthesis ◽  
Composites Materials ◽  
Volcanic Glasses ◽  
Fly Ash Utilization

Abstract The fly ash from powerplant can be compared, due to its genesis, chemical and mineralogical composition with the natural volcanic glasses and minerals generated in the process of devitrification in situ. Its quality is comparable to non-metallic alumosilicate raw materials that are commercially used in building and ceramic industry. Two possibilities of fly ash utilization as the most bulk waste produced by anthropogenic activity were examined. The way of fly ashes utilization in the modeling of mixtures for the high refractory mullite corundum materials synthesis was examined. In this experiment 95.5% conversion of the input components of fly ash and Al additive in the ratio 1:1 on the mullite and corundum was obtained.

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