Publication # 24-10-081 Fly Ash and Its Use in Concrete …

Class C Fly Ash is derived from burning younger, softer coal, such as lignite or sub-bituminous coal. It contains higher amounts of calcium, in addition to silica, alumina, and …

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Improvement of expansive soil characteristics stabilized with …

(SDA) and high calcium fly ash (HCFA) on the geotechnical characteristics of expansive soil (ES). The effectiveness of these pozzolanic materials was examined, particularly tests of their physical

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Factors for increasing strength of composite materials based on …

The fine high-calcium fly ash (d90 < 10 microns) selected from the fourth field of electrostatic precipitator was the source for high strength specimens. In the composition with a superplasticizer ...

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(PDF) The fine high-calcium fly ash as the basis of composite …

The use of high-calcium fly ash from the combustion of Kansk-Achinsk coal in the production of autoclaved and non-autoclaved aerated concrete, in addition to saving cement, leads to a decrease in shrinkage and an increase in the strength of products [12].The high-volume fly ash concretes where 50–70 % PC was substituted, are of great interest ...

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Influences of the Ratios of High-Calcium Fly Ash to Low-Calcium Fly Ash

Influences of the Ratios of High-Calcium Fly Ash to Low-Calcium Fly Ash on the Strength and Drying Shrinkage of Geopolymer Mortar. May 2014; Advanced Materials Research 931-932:416-420;

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Influence of Bentonite on Mechanical and Durability Properties of High

The high-calcium fly ash (HCFA) was used as the primary source material to produce the geopolymer concrete; therefore, it can set and harden at ambient temperature. Bentonite was used as a partial replacement (0%, 10%, 15%, and 20%) for fly ash in both the GNAC and GRAC.

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(PDF) Reactivity indicators for activated high-calcium fly ash …

For variations of substitution materials, fly ash is used as a cement substitution.The variation of fly ash is 20% and while the limestone waste is used variations of 0%, 10%, 20%, 30% and 40%.The ...

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(PDF) High-calcium fly ash recovery from wet-stored

Herein the high calcium lignite fly ash with calcium oxide constituent in a range of 20%-30% is the focus of this study. Important characteristics of fly ash have been studied, including physical ...

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Comparative mechanical and microstructural properties of high calcium

Mohammed et al. [11] reported a compressive strength of 50 MPa with excellent flowability for OPGs synthesised with high calcium fly ash and anhydrous-Na 2 SiO 3. Nonetheless, the pore content and the effect of water content in the one-part mixtures are not studied. The porosity of the OPG structure is essential to support the mechanical ...

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THE EFFECT OF HIGH CALCIUM FLY ASH ON …

High calcium fly ash was found to be much less effective in resisting deterioration than control samples containing general use portland cement. Part of the experimental program focused on adding calcium sulfate or silica fume to high-calcium fly ash to enhance its

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Alkali-Activated Controlled Low-Strength Material Utilizing High

AbstractThis study investigated the performance of alkali-activated, cement-based controlled low-strength materials (CLSMs). The CLSM was produced by mixing fly ash, steel slag, sodium hydroxide, and water with bottom ash (BA) aggregate. Properties of ...

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Use of alkali activated high-calcium fly ash binder for kaolin …

14 Phone : + 33 2 40 84 58 02 15 Fax: + 33 2 40 58 57 77 16 E-mail: [email protected] 17 Abstract 18 This study addresses the use of alkali activated high-calcium fly ash-based binder to 19 improve engineering characteristics of soft clay-rich soils as an alternative to common ... 110 high-calcium fly ash only, whereas KF50 and KF20 ...

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Fly Ash: Composition, Benefits, and Applications in Concrete

Class C ash is often referred to since high calcium ash as it usually contains many as 20% CaO. ... High-carbon fly ash materials prefer to use more water and even darken asphalt. It is not advised to use a high-carbon (greater than 5%) content of fly ash, but if it is to be used, the correct air content can be obtained by increasing the ...

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Effect of fly ash on Portland cement systems

A high-calcium fly ash (FH, 23% total CaO–5% free CaO), with high SO3 content (4.3%), was studied as additive in mortar, replacing part of the volume either of Portland cement or aggregate.

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Experimental study on preparation of fly ash-based geopolymer …

Kalinkin et al. [27] prepared a fly ash-based geopolymer blended with dolomite, and concluded that adding an appropriate amount of dolomite can improve the strength of fly ash-based geopolymer due to its high calcium content. The aforementioned studies reveal that adding an appropriate amount of external calcium source is capable of effectively ...

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Strength, durability, and heat development characteristics of high

According to ASTM C618, a fly ash with at least 18 % CaO is classified as a high-CaO fly ash. A fly ash with less than 18 % Cao is classified as a low-CaO fly ash or Class F fly ash. Theoretically, high-calcium fly ash produced from the combustion of subbituminous or lignite coal has cementing or self-hardening properties [24].

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Calcium wastes as an additive for a low calcium fly ash geopolymer

High-calcium fly ash (HCFA) from the lignite PCC process of the Mae Moh power plant complied with Class C coal ash specifications and was used for comparison. The minimum combined content of SiO 2, Al 2 O 3, and Fe 2 O 3 of 50% was detected for the Class C fly ash, with a high calcium content of 31.0 wt%. The median particle size (D50) of the ...

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Dry Mix Slag—High-Calcium Fly Ash Binder. Part One: …

High-calcium fly ash contains free CaO, CaSO 4, 3CaO·Al 2 O 3, which all can react with water. In addition, a significant part of the HCFA represents glass phase that is capable of hydration in ...

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Setting Time, Strength, and Bond of High-Calcium Fly Ash …

AbstractIn this paper, setting time, strength and bond of high-calcium fly ash geopolymer concrete were investigated. The high-calcium fly ash was from Mae Moh power plant in northern Thailand. Both sodium silicate solution and sodium hydroxide solution ...

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Novel Analytical Method for Mix Design and Performance …

The database included only high calcium fly ash concrete mixes and did not consider mortar or phase mixes, and excluded the blended high calcium fly ash composites. This selection criteria was adopted to develop a mix design procedure that could predict the standard 28-day compressive strength for high calcium fly ash geopolymer concrete ...

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Performance Improvement of Cement-Based Materials …

Performance Improvement of Cement-Based Materials Containing Coal Gasification Fine Ash by Using High-Calcium Solid Waste: Experimental, Hydration Kinetics, and Thermodynamic Modeling Investigation ... "Effect of triethanolamine on the chloride binding capacity of cement paste with a high volume of fly ash." Constr. Build. Mater. 315 (Feb ...

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Mechanical properties of discarded shield residue improved by calcium

To utilize discarded shield residue and alleviate the shortage of subgrade filling, industrial wastes such as calcium carbide slag (CCS) and fly ash (FA) were considered to enhance the mechanical properties of the shield residue. A series of laboratory tests, including California Bearing Ratio (CBR) tests, unconfined compressive strength (UCS) tests, moisture …

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Fly ash booklet for pdf

quartz, tricalcium aluminate, and free lime (CaO). Class C ash is also referred to as high calcium fly ash because it typically contains more than 20 percent CaO. Class F ashes are typically derived from bituminous and

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Properties of high-calcium and low-calcium fly ash combination

Fly ash is an aluminosilicate material that is widely used for the preparation of geopolymer composites, especially low-calcium fly ash (LCF) (Nath and Sarker, 2017).In fact, one of the most important benefits of using fly ash for geopolymer synthesis is its easy availability compared to other source materials (Mehta and Siddique, 2017).In Thailand, most fly ash is …

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High calcium fly ash-auto glass powder alkali-activated pastes

In the experiment, 0–40% auto glass powder (AGP) by weight was used as a substitute for high-calcium fly ash in the geopolymer paste. The setting time, workability, …

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Durability Study on High Calcium Fly Ash Based Geopolymer …

This study presents an investigation into the durability of geopolymer concrete prepared using high calcium fly ash along with alkaline activators when exposed to 2% …

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Setting Time, Microstructure, and Durability Properties of Low Calcium

The setting time of concrete should be sufficient enough for concrete to be handled and casted before any sign of setting. The low-calcium class-F fly ash-based geopolymer has a high setting time, which can be reduced significantly by using heat curing [25,41] or by adding GGBFS [25,29]. Evaluating the parameters that influence the setting ...

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(PDF) High-calcium fly ash as the fourth constituent in concrete

Keywords: High-calcium fly ash; Concrete; Compressive strength; Fly ash treatment 1. Introduction Fly ash is used extensively in concrete either as a separately batched material characterized as addition as it appears in EN 206-1 [1] or as an ingredient in blended cement (Type CEM II, IV of EN 197-1) [2].

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Phase Analysis of Alkali-Activated Slag Hybridized with Low-Calcium …

This paper investigates the hydrated phase assemblage, microstructure, and gel composition of sodium hydroxide (NaOH)-activated fly ash–slag blends with either low-calcium or high-calcium fly ash. The results show that the nature of precipitated calcium–aluminosilicate–hydrate (C-A-S-H) and alkali aluminosilicate-hydrate (N-A-S-H) …

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Mineralization behavior and strengthening technology of high calcium

Iron ore sintering is the first high-temperature process in the iron and steel industry. The annual sinter output of China has exceeded one billion tons [20].The iron ore sintering process used to treat waste incineration fly ash mainly has the following advantages: (i) Waste incineration fly ash contains a large amount of CaO, which can be used as calcium based flux …

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