Effect of silica fume on compressive strength of ultra-high …
But for mixes with 10% CAC content, a high SF dosage (>10%) negatively influenced the compressive strength. ... The specific surface areas of the low-calcium fly ash, …
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GEOPOLYMER MORTAR INCORPORATING HIGH …
The present study has High Calcium Fly Ash (HCFA) and silica fume as the source material for the geopolymer mortar. In this experiment, it is proposed to mix HCFA with silica fume …
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Properties of high-calcium fly ash-based geopolymer …
The Afşin-Elbistan thermal power plant, which is located in Turkey, is a lignite burning thermal power plant with a capacity of eight units in two plants and an installed …
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A Cementless Binder Based on High-Calcium Fly …
High-calcium fly ash expansion as a stand-alone binder can be stopped by using a silica fume additive. For the fly ash at the Berezovskaya Power Plant, this content is 40% of the fly ash mass [16]. With a lower amount …
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Influences of Silica Fume on Compressive …
Although elevated temperature curing can increase the compressive strength of alkali-activated mortar, its field applications are still limited. In this study, alkali-activated mortars were prepared using high …
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Properties of high-calcium fly ash-based geopolymer …
Geopolymer properties were improved by using high-siliceous materials. In this study, the Afşin-Elbistan fly ash (FA), which is high in calcium content (≈43%) and which does …
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High-calcium fly ash recovery from wet-stored condition and …
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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Mechanical property and microstructure of fly ash-based …
During compound activation, when the amount of calcium hydroxide exceeds that of calcium sulfate, the high OH-content creates a highly alkaline environment, accelerating fly …
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Influence of Silica Fume on High-Calcium Fly Ash …
Influence of silica fume content on temperature increase of fly ash-silica fume paste (designations according to Table 4). Figures - available via license: Creative Commons Attribution 4.0 ...
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Influence of rice husk ash on mechanical properties and fire …
The broad amorphous hump around 20°–40° (2θ), which typically appears on the XRD patterns of high-calcium fly ash based geopolymer composites (Guo et al., 2010, Phoo …
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Comparative mechanical and microstructural properties of high calcium …
Fly ash is categorised into Class F and Class C as accordance to ASTM C618-19 based on the calcium oxide (CaO) content. Class F fly ash has CaO content lower than 18% …
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Fly ash, GGBS, and silica fume based geopolymer
On, the other hand, the brittleness promoted by the addition of excess silica content in the mix might be the reason for the later [51]. 3.3. Mineralogical and microstructural …
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Mineralogy and Chemical Composition of High-Calcium Fly …
On the basis of chemical composition, high-calcium fly ashes can be classified into four groups namely: calcium oxide, calcium sulfates, Ca−Al−Si compounds, and Ca−S−X (X: Fe, Al, Si, …
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SIP 4 Restrictions on Type and Characteristics of Fly Ash
The calcium oxide (CaO) content of fly ash shall not exceed XX% The Loss on Ignition (LOI) of fly ash shall not exceed X.X% (more ... and Thomas, M.D.A., "Sulfate Resistance of Mortars …
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Geopolymer Mortar Incorporating High Calcium …
[3] used fly ash to produce geopolymer mortar with highest compressive strength of 10.6 MPa with 14 molarity, another study by [4] using high calcium fly ash and silica fume and it was found that ...
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Review
According to ASTM C618 [91], a fly ash containing low alkali and low calcium is classified as class F and those with high alkali and high calcium content belong to class C. It …
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Strength and resistance to sulfate and sulfuric acid of ground
The compressive strengths of composite with 3.75% silica fume immersed in 5% magnesium sulfate solution and 3% sulfuric acid solutions were substantially higher than the …
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Fly ash and slag
The high SiO 2 content in low calcium ashes and the high proportion of glass in the ash composition make the content of active SiO 2, i.e. silica reacting with Ca(OH) 2 under …
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Rice husk ash (RHA) effectiveness in cement and
This behaviour is better than low-calcium fly ash (FL where k = 0.5–0.7) and almost equivalent to high-calcium fly ash, but much worse compared to silica fume (SF, where k = …
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Characteristics of High Calcium Fly Ash Geopolymer Mortar
2.1 Materials and Equipment. The brown coal fly ash was supplied from Germany; it was treated with water, homogenized and ground by the manufacturer. The chemical …
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Fly ash for sustainable construction: A review of fly ash …
Fly ash for sustainable construction: A review of fly ash concrete and its beneficial use case studies ... The class F FA is a byproduct of bituminous coal combustion. The iron, …
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GEOPOLYMER MORTAR INCORPORATING HIGH …
to develop improved strength under ambient curing [20]. The inclusion of silica fume into low calcium fly ash geopolymer optimizes the microstructure and yielded higher strength [21-24]. …
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Calcium wastes as an additive for a low calcium fly ash …
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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Effect of calcium content on soil stabilisation with alkaline
Soil improvement with alkaline activation, cement and lime. Low and high calcium fly ash were activated with a sodium-based solution. Higher short/long term strength with high/low …
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Investigating the role of reactive silica in the hydration mechanisms
During the 80s, several workers highlighted the distinct behavior of Class C fly ashes during hydration. Marsh and Day [14] for example, compared the hydration of a Class C …
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Effect of SiO2 and Al2O3 on the setting and …
Overall, increases in either silica or alumina content appear to shorten the setting time of high calcium-based systems unlike conventional geopolymer systems where increasing Al 2 O 3 accelerates setting. The …
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Influence of Silica Fume on High-Calcium Fly Ash Expansion …
The high content of CaO free (>10%), leading to strong expansion and cracking during the curing period, is a serious problem that prevents the use of high-calcium fly ash in concrete …
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Fresh and Hardened Properties of High Calcium Fly Ash …
Fly ash, either with low calcium (class F) or high calcium (class C) content, is a material rich in silica and alumina, and can be used as a precursor in making geopolymer. The …
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Improving the performance of ternary blended cements by …
Two high-calcium fly ashes (designated here as T f and T k) were selected from a total of eight ashes coming from Ptolemais area. The principal aim, during the selection …
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Evaluation of blends of high and low calcium fly ashes for …
Two different fly ashes, all supplied by the Hellenic Public Power Corporation, one with high calcium content (from Ptolemais area), designated here as T f, and one with lower …
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