(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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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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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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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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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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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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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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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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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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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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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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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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Both class F and class C Fly Ash (FA) as precursors have been extensively used for the development of geopolymers [19], [20], [21]. The class C FA contains high calcium oxide (CaO) and is designated as a self-cementing FA. The Class C Fly ash has been used for making concrete and soil stabilization without cement [22], [23], [24]. The reaction ...
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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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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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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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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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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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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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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 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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109 high-calcium fly ash only, whereas KF50 and KF20 are the alkali activated soils. KF50 110 corresponding to a solid phase made of 50% of high-calcium fly ash and 50% of kaolin 111 in mass, and KF20 corresponding to a solid phase made of 20% of high-calcium fly ash 112 and 80% of kaolin. List of samples is summarized up in Table 2.
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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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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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Fly ash is a by-product of the combustion of pulverized coal in electric power generating plants. It is the most widely used supplementary cementitious material in concrete. It is used in more …
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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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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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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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A high-calcium fly ash (FH, 23% total CaO–5% free CaO), with high SO 3 content (4.3%), was studied as additive in mortar, replacing part of the volume either of Portland cement or aggregate. The development of the strength, porosity, bound water, and calcium hydroxide content was measured. When this fly ash replaces aggregate, significantly ...
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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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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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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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Low cost and sustainable repair material made from alkali-activated high-calcium fly ash with calcium carbide residue. Constr. Build. Mater., 247 (2020), Article 118543, 10.1016/j.conbuildmat.2020.118543. View PDF View article View in Scopus Google Scholar [69]
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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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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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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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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 …
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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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