Mechanical and microstructural properties of high calcium fly ash …

2.1. Materials. High calcium fly ash was used as the primary binder in this investigation. The chemical components of the high calcium fly ash used were detected by X-Ray fluorescence (XRF) and presented in Table 1.The fly ash was acquired from the Manjung Power Plant in Perak, Malaysia as a source of aluminosilicate materials for the production of one-part …

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Strength, durability, and heat development characteristics of …

High-CaO fly ash is more highly reactive than low-CaO fly ash, probably because of its higher contents of highly active calcium aluminosilicate glass and crystalline compounds. …

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Fly ash booklet for pdf

Fly ash utilization, especially in concrete, has significant environmental benefits including: (1) increasing the life of concrete roads and structures by improving concrete …

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Effect of fly ash on Portland cement systems: Part II. High-calcium fly …

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.

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Workability and strength of coarse high calcium fly ash geopolymer

The strength increases with an increase in the curing time. A good strength of 48.5 ... This is rather unexpected as the literatures on the case of low calcium fly ash indicated that the high sodium silicate to NaOH ratio provided a higher compressive strength [4]. The variation in the ratio of sodium silicate to NaOH ratio affects the pH ...

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Alkali-Activated Controlled Low-Strength Material Utilizing High …

This 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 ...

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Low cost and sustainable repair material made from alkali …

In this work, a study on a low cost and sustainable repair material made from alkali-activated high-calcium fly ash (FA) incorporated with calcium carbide residue (CCR) is reported. The FA was partially replaced with CCR (additional calcium source) at the dosages of 0%, 10%, 20%, and 30% by weight of binder.

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

shows a high early strength (Xie and Kayali, 2016). Fly ash is an aluminosilicate material that is widely used for the preparation of geopolymer composites, especially low-calcium fly ash (LCF)(NathandSarker,2017).Infact,oneofthemostimportantbenefits of using fly ash forgeopolymersynthesisis itseasyavailabilitycompared

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Properties of high-calcium fly ash-based geopolymer …

The fly ash used in the study, which has very high-calcium (≈43%), has not good results for 10 M concentration. The compressive strength results and the microstructure images of the pastes support the results.

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Effects of low- and high-calcium fly ash on the water …

To expand the application range of magnesium oxysulfate cement (MOSC) and the utilization of fly ash, the water resistance of MOSC mixed with low-calcium fly ash (L-FA) or high-calcium fly ash (H ...

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

This work reports on an investigation of changes in physical and chemical properties of high calcium fly ash after recovering from the wet-stored conditions.

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Low-Calcium fly ash-based geopolymer concrete: Long-term properties

A subsequent Research Report GC3 covers the behaviour and strength of reinforced geopolymer concrete structural beams and columns.Heat-cured low-calcium fly ash-based geopolymer concrete has excellent compressive strength, suffers very little drying shrinkage and low creep, excellent resistance to sulfate attack, and good acid resistance.

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Evaluation of blends of high and low calcium fly ashes for …

Part II: a fundamental estimation of the efficiency factor. Cem Concr Res 2002;32(10):1533–8. [23] Antiohos S., Tsimas S. Investigating the role of reactive silica in the hydration mechanisms of high-calcium fly ash/cement systems. Cem. Concr. Comp. In press. [25] Papadakis VG. Effect of fly ash on Portland cement systems. Part II: high ...

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Evaluation of the Chemical and Mechanical Properties of …

For concrete containing high-calcium fly ash (FH, CaO more than 10%), the investigations are relatively insufficient. Due to the problems associated with the FH chemical …

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Fresh and Hardened Properties of High Calcium Fly Ash …

The results of the XRF test are reported in Table 3.Both fly ash samples were found to be high calcium fly ash (class C), with total content of SiO 2 + Al 2 O 3 + Fe 2 O 3 of 67.8% and 66.29% for FA1 and FA2, respectively, and the CaO level of more than 10% and with a very low loss on ignition (LOI) value. FA2 has higher CaO content than FA1.

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

Read Setting Time, Strength, and Bond of High-Calcium Fly Ash Geopolymer Concrete ... low permeability, good chemical resistance, and excellent fire resistance. To study the sulfuric acid corrosion resistance of geopolymer concrete (GPC) with different binding materials and concentrations of sodium hydroxide solution (NaOH), metakaolin, high ...

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Dynamic properties of PVA short fiber reinforced low-calcium fly ash

The micromorphology of low-calcium fly ash and blast furnace slag is presented in Fig. 18. Low-calcium fly ash shows a complete spherical structure under SEM (Fig. 18 a), so fly ash can be used as an additive to improve the fluidity of concrete materials when preparing concrete. However, the spherical structure has a negative impact on concrete ...

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Characteristics of Waste Iron Powder as a Fine Filler in a High-Calcium …

For the preliminary study, using of high NaOH concentration (10 M) with high-calcium fly ash resulted in the fast setting of paste due to the reaction between NaOH and CaO. Therefore, lower NaOH concentration of 8 M was selected to overcome this problem and provide the more workability of paste.

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

High-calcium fly ash produced from low-temperature combustion of fuel, like in circulating fluidized bed technology, reacts with water readily and is itself a good hardening activator for GGBFS ...

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

This study presents the properties of a recycled aggregate geopolymer mortar made with a blend of high-calcium fly ash (HCF) and low-calcium fly ash (LCF). An experimental study was divided into two series. In series I, an effort was made to produce a more durable HCF geopolymer by partially replaci …

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The effects of calcium content of fly ash on hydration and

In this study, the effects of low-calcium fly ash (LFA) and high-calcium fly ash (HFA) on C–S–H structure, hydration products, hydration heat, and compressive strength of …

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DURABILITY STUDY OF LOW CALCIUM FLY ASH GEOPOLYMER CONCRETE …

< 3.0 low good . 3.0 to 5 ... The results show that mortar and concrete made with portland cement-free activated fly ash develop a high mechanical strength in short periods of time, have a ...

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Low-Calcium, Fly-Ash-Based Geopolymer Concrete

An x-ray fluorescence (XRF) analysis may be used to determine the chemical composition of the fly ash. Low-calcium fly ash has been used successfully to manufacture geopolymer concrete for which the silicon and aluminum oxides constituted about 80% …

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(PDF) Development and Properties of Low-calcium Fly Ash …

fly ash or high-calcium fly ash, as it typically contains more than 20 percent of C aO. On the other hand, fly ash from the bituminous a nd anthracite c o als is referred a s ASTM Class F fly ash ...

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Geotechnical Properties of Low Calcium and High Calcium …

For high calcium fly ash, chemical and mineralogical differences have been observed for different size fractions. Compared to low calcium fly ash, optimum moisture content is low and …

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

The low cementitious capability in alkali-activated high-calcium fly ash may be attributed to the unstable N-C-A-S-H gel structure with concurrent high Na and Ca contents.

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Evaluation of blends of high and low calcium fly ashes for …

Evidence included in this investigation reveal that quicklime presence accelerated the reaction rate of high-calcium fly ash, whereas in the case of lower-calcium fly ash, quicklime had a …

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Research Article Durability Study on High Calcium Fly …

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A Mix Design Procedure for Alkali‐Activated …

In this paper, we propose a novel mix design methodology for alkali-activated high-calcium fly ash concrete (AAHFAC) in a rational approach. It should be noted that the method is easy to use because it is based on the ACI …

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Low cost and sustainable repair material made from alkali …

The AA high-calcium FA has been used as an alternative repair material [16], [17], [18], [29] because of its fast setting and excellent mechanical properties. However, its strength is still lower than that of alkali-activated slag incorporated with low calcium FA [24].Many researchers have used the reactive CaO as additives for developing its strength when cured at …

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

Keywords: geopolymer; high-calcium fly ash; low-calcium fly ash; drying shrinkage; setting time. Abstract. N ew types of binders are b eing d eveloped as an alternative to traditional cement.

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