It was observed that 12% NaOH-treated fly ash samples, 16% KOH, and 16% Ca (OH) 2 -treated fly ash samples at 28 curing days show an optimum compressive strength …
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The activity index on Day 28 of fly ash A was only 117%, and the amorphous form was the lowest among the three raw materials, indicating the activity index and amorphous content are not in absolute relation to AAM strength. ... The optimum alkali-equivalent content in fly ash A was AE% = 7%, with the best compressive strength 38.58 MPa at 20% ...
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Chemical index of the fly ash quality can be used to show the effectiveness of fly ash on alkali-silica reaction (ASR) of concrete. The effect of 10 type of fly ashes on ASR were...
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After years of decline, coal consumption has risen significantly in the last year (2021), driven mainly by the ever-increasing demand in fast-growing Asian countries and fostered by rising gas prices in Europe and the United States. Coal is both the largest electricity production source and the largest source of carbon dioxide emission. Coal-fired plants produce electricity …
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We then designed and prepared fiber-reinforced alkali-activated fly ash slag mortar and studied the effects of the alkali activator modulus, glass fiber (GF), and polypropylene fiber (PPF) on …
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shows the variations in compressive strength of concrete with various percentages of FA at 3, 7, and 28 days. For FA0, the compressive strength increased from 18.6 MPa to 24.0 MPa, and 42.6 MPa ...
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The coal represents the primary source of fossil energy consumption in China, with an annual consumption reaching 1.91 billion tons in 2019. This places China at the global forefront in terms of annual consumption, a position it has held constantly since 2010 [1].The thermal power generation accounts for a considerable proportion of the coal consumption in China.
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Extensive research [1, 2] has been carried on the alkali activation of aluminosilicates (found in metakaolin or fly ash), in pursuit of a binder system (so-called geopolymer) that is recognized as a suitable green material instead of ordinary Portland cement for a variety of applications.In such a binder system, mixing fly ash (or metakaolin) with alkali …
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Abstract. It is well chronicled that coal fly ash can mitigate the risk of alkali-silica reaction (ASR) in concrete structures. However, the efficacy of individual fly ashes is highly dependent on their chemical composition. Prescriptive requirements for ASR mitigation have largely focused on whether the fly ash is classified as Class F or Class C per ASTM C618, …
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This study utilized Class F fly ash and S95 ground granulated blast furnace slag as binders to substitute Portland cement. The fly ash exhibited an apparent density of 2.55 g/cm 3 and a bulk density of 1.12 g/cm 3, while the slag showed an apparent density of 2.9 g/cm 3, a specific surface area of 412 m 2 /kg, a 7-day activity index of 86 %, and a 28-day activity index …
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... to the higher potassium content in fly ash, the total alkali content and base- to-acid ratios is higher as well, as shown in Table 1. This indicates that fly ash will have a...
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the following fly ash and slag content (100:0, 70:30, 50:50, 30:70, 0:100 wt.%) have been prepared using sodium hydroxide/sodium silicate solutions. The increase of slag amount
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Fly Ash—lass F Per ASTM C-618 Specifications Product Description: Fly Ash is a pozzolanic cement replacement that enhances the performance of concrete by increasing compressive strength, improving workability, durability, long term strength, resistance to freeze-thaw …
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Sodium and potassium are the common alkalis present in fly ash. Excessive amounts of fly ash alkalis can cause efflorescence problems in concrete products and raise concern about the …
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When the fly ash content or alkali dosage was too high, fly ash cannot be activated properly and excessive moisture was consumed, reducing the overall density. ... Air content of concrete was an important index affecting its freeze-thaw resistance. ... (Grant 52178259) and the Technical Service Projects by Qingjian Co., Ltd. (Grant No. 20220149 ...
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As shown in Figure 5b, the pattern of change of double-sided shear strength of GPM repaired concrete substrate was negatively correlated with the growth of fly ash content, in other words, the double-sided shear strength continued to decline continuously with the growth of fly ash content. With reference to OPC100, S45F10R45, S42.5F15R42.5 ...
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The dispersion of fly ash in water results in an alkaline pH from 10 to 13. At high pH, the fly ash becomes negatively charged allowing the removal of heavy metal ions by …
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Then, to demonstrate the potential beneficial use of chemical composition information of fly ash, an alkali-silica reaction (ASR) durability index was proposed to predict …
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AbstractThis study investigates the combined impact of fly ash (FA) and lime sludge (LS) based geopolymer treatment of Edgar plastic kaolin (EPK) clay. ... A. Viana Da Fonseca, and C. Ferreira. 2016. "Structural performance of alkali-activated soil ash versus soil cement." J. Mater. Civ. Eng. 28 (2 ... Note: This content will be debited as ...
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The hydration products in materials derived from high-calcium sources, like slag, are usually C-A-S-H; conversely, in a system with low-calcium content, such as alkali-activated fly ash or metakaolin, the products are mainly N-A-S-H [43,44]. As a low Ca content in LS and fly ash, the primary hydration products of the ALFC are N-A-S-H.
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Alkali-activated materials (AAMs), manufactured by the reaction between alkaline activator and solid aluminosilicate powders, i.e. fly ash (FA), ground granulated blast furnace slag (GGBFS) and calcined clay, have attracted much interest in academic and industrial fields over the past decades [1], [2].AAMs present comparable mechanical properties and considerably …
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In addition, there are few related academic achievements. Slag and fly ash are common precursor materials, and there is the most research on alkali-activated fly ash, slag, and fly ash-slag systems [[18], [19], [20]]. C-(A)-S-H gel and N-A-S-H gel are the main hydration products of the alkali-activated fly ash-slag (AAFS) system, and the water ...
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Fly ash inspection index. Test Items Unit Standard Indicator Test Result; ... water glass solid content, and water–solid ratio were 10.181, 0.204, 4.606, and 4.209, respectively. The F value of fly ash content is significantly higher than that of the other three factors, which means that the effect of fly ash content on final setting time is ...
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The Class F fly ash used in this experiment was obtained from the Huaneng Power Plant in Qingdao, Shandong Province, China. It has a specific surface area of 517 m 2 /kg and an apparent density of 2.12 g/cm 3. Its chemical composition is listed in Table 2. The total Si oxide and Al oxide content of the fly ash is 82.45 %.
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The self-hardening property of fly ash owing to its free lime content has made fly ash a suitable for construction material . However, the cementitious property of fly ash can be further enhanced by activation . The investigation of strength properties of fly ash has spurred the scientific curiosity in the past few decades.
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A study on the influence of the inclusion of slag or fly ash and five types of superplasticizers on the fresh and hardened properties of alkali-activated cements is presented. Three alkali-activated slag formulations with different fly ash content (0, 15, and 30%) in the presence of five admixtures (vinyl copolymer, melamine, and three polycarboxylates with …
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MSW incineration creates a variety of residual products, notably bottom ash and fly ash, which make up approximately 90 % and 5 % of all combustion leftovers, respectively [5].Currently, bottom ash is being repurposed in the reclamation of metals and the production of construction materials [6].Nevertheless, fly ash, which contains organic components high in …
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Cracks and other defects in concrete will affect its durability, thermal insulation effect, and energy consumption. ASR is one of the common causes of concrete cracks. In this study, mortar specimens modified with fly ash were prepared using the mortar bar rapid method, and the inhibition effect of ASR in two alkali environments and the building energy efficiency …
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Relationship between total alkali and available alkali for fly ash High-alkali fly ash from Ottumwa Generating Station was not conclusively linked to ASR problems at any field site. It was used in pavements that had both good and poor performance. Sites 2, 5 and 9 all contained OGS fly ash but did not exhibit significant
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Various factors influencing the strength development of alkali-activated fly ash-based geopolymer mortar are discussed, such as activator composition, curing conditions, curing duration, and fly ...
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