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Optimization of surface modification parameters of fly ash with high

A critical review on mechanochemical processing of fly ash and fly ash-derived materials Sci. Total Environ., 860 ( 2023 ), Article 160529 View PDF View article View in Scopus Google Scholar

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Workability and strength of coarse high calcium fly ash geopolymer

All geopolymer mortars were made with sand to fly ash ratio of 2.75. The NaOH of three concentrations viz., 10, 15 and 20 M and the sodium silicate to NaOH ratios by mass of 0.67, 1.00, 1.50, and 3.00 were used.In order to obtain the workable geopolymer mortar, a minimum base water content of 5% by mass of the geopolymer paste (fly ash, NaOH, sodium silicate …

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

much fly ash to use in a specific concrete application. 1. ... high levels of fly ash substitution (typically more than 30%) can sometimes lead to issues such as reduced early-age strength, ... It has a lower calcium content compared to Class C fly ash. Properties:• Primarily pozzolanic, meaning it requires a source of calcium, such as ...

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Standardization aspects concerning High Calcium Fly Ashes

According to ECOBA statistics, the amount of High Calcium Fly Ashes (HCFA) in Europe is more than 50% of the total fly ash produced by burning hard coal and lignite [2].

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IURPZHW VWRUHG Calcium Fly ash based sustainable

Strength Development of High Calcium Fly Ash Based Geopolymer as Pavement Base Materials Liyana Ahmad Sofri, Mohd Mustafa Al Bakri Abdullah, Mohd Rosli Mohd Hasan et al.-This content was downloaded from IP address 40.77.167.126 on 28/10/2023 at 00:41.

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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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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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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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(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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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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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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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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Fly ash properties, characterization, and applications: A review

The high content of Al 2 O 3 and SiO 2 in class F fly ash make it suitable for conversion to other substrates with high-capacity adsorption. Class F fly ash has been chemically altered into a substrate having a surface with high polarity by hydrothermal treatment and showed a complex adsorption process from a pollutant system containing multi ...

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I Increasing Cementitious Products of a Class C Fly Ash

rescence studies on a Class C cementitious fly ash from Lansing, Iowa, showed this high calcium fly ash as having about 30 percent elemental calcium as an

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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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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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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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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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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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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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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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Transforming MSWI fly ash into low-carbon and high-compatibility

Transforming MSWI fly ash into low-carbon and high-compatibility composites via designed calcium sulfoaluminate-based binders. Author links open overlay panel Yan Xia a, ... Influence of fly ash on the hydration of calcium sulfoaluminate cement. Cement Concr. Res., 95 (2017), pp. 152-163.

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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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232.2R-18: Report on the Use of Fly Ash in Concrete

Fly ash is used in concrete and other portland cement-based systems primarily because of its pozzolanic and cementitious prop-erties. These properties contribute to strength gain and are …

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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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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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High-calcium fly ash recovery from wet-stored condition and its

To our knowledge, material properties and composition of fly ash with relatively higher calcium influencing its performance in concrete has been rarely reported. This work …

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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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