0086-21-58386256

Chloride diffusion in alkali-activated fly ash/slag concretes: Role of

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 …

WhatsApp: +86 18221755073

Technical Data Sheet

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 …

WhatsApp: +86 18221755073

PHYSICAL PROPERTIES AND PORE SOLUTION …

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

WhatsApp: +86 18221755073

Characterizing Fly Ash (Report 0-6648-1)

combustion conditions, and cooling regimes. Furthermore, the fly ash industry is quite dynamic and is rapidly changing due to recently imposed environmental regulations. As such, fly ash produced from a given power plant may be considerably different than fly ash produced from the same plant just a few years ago. Therefore, it is

WhatsApp: +86 18221755073

A Modified Chemical Index to Predict Fly Ash Dosage for …

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 …

WhatsApp: +86 18221755073

Interfacial Behavior of Slag, Fly Ash, and Red Mud-Based

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 ...

WhatsApp: +86 18221755073

Influence of the Fly Ash Content on the Fresh and Hardened

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 …

WhatsApp: +86 18221755073

Workability, rheology, and geopolymerization of fly ash …

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 %.

WhatsApp: +86 18221755073

MECHANICAL PROPERTIES OF HIGH-VOLUME FLY ASH CONCRETE WITH VARYING FLY

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 ...

WhatsApp: +86 18221755073

(PDF) GEOPOLYMER MORTAR WITH ALKALIACTIVATED FLY ASH …

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 ...

WhatsApp: +86 18221755073

Performance assessment of three alkali-treated fly ashes as a …

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 …

WhatsApp: +86 18221755073

A Modified Chemical Index to Predict Fly Ash Dosage for …

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, …

WhatsApp: +86 18221755073

High-temperature performance of alkali-activated binders of fly ash …

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 …

WhatsApp: +86 18221755073

Mechanical properties and sulfate resistance of basalt fiber …

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 …

WhatsApp: +86 18221755073

Alkali Content of Fly Ash Measuring and Testing Strategies …

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 …

WhatsApp: +86 18221755073

All-solid-waste cementitious materials for grouting: Effects of alkali

The "Technical Code for Ground Treatment of Buildings in Coal Mine Goaf" (GB 51180–2016) categorizes the permissible values of deformation of the treated site into three levels, A, B, and C. Foundations in the A and B categories require an unconfined compressive strength (UCS) of at least 2.0 MPa, while those in the C category must have a UCS of at least 0.6 MPa.

WhatsApp: +86 18221755073

Alkali Content of Fly Ash – Measuring and Testing Strategies for …

The lab study focused on the available alkali test and how fly ash alkali content impacts common performance tests (mortar-bar expansion tests). Twenty-one fly ash samples were evaluated …

WhatsApp: +86 18221755073

TECHNICAL PAPER EfficiEnt Production of AlkAli-ActivAtEd …

ratios based on the reactive oxide content in the fly ash. 1. IntroductIon Fly ash is most attractive source material to produce a cement-free binder. Alkali-activation of low-calcium fly ash produces

WhatsApp: +86 18221755073

Use and effect of fly ash in concrete: A literature …

A type of fly ash increasingly used for engineering purposes is Vietnamese fly ash, which is used in optimal dosages of 10% and 20%, where an improvement in its mechanical property of flexu ral

WhatsApp: +86 18221755073

Mechanical and durability properties of alkali-activated fly ash

They reported good freeze–thaw resistance after exposure to 50 freeze–thaw cycles [55]. Puertas et al. [56] compared the resistance of Portland cement, alkali-activated fly ash, alkali-activated slag and a combination of 50% fly ash and slag mortars. They prepared beams (40 × 40 × 160 mm) for each mix, which were subjected to freeze ...

WhatsApp: +86 18221755073

Mechanical and durability properties of alkali-activated fly ash

At the forefront of the technical concerns is uncertainty associated with ... compared the resistance of Portland cement, alkali-activated fly ash, alkali-activated slag and a combination of 50% fly ash and slag mortars. They prepared beams (40 × 40 × 160 mm) for each mix, which were subjected to freeze–thaw cycles with water, not de-icing ...

WhatsApp: +86 18221755073

Influence of Different Parameters on the Performance of Alkali

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 ...

WhatsApp: +86 18221755073

Coupling Effect of Fly Ash and Lime Sludge Geopolymer in …

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 ...

WhatsApp: +86 18221755073

Immobilization properties and reaction mechanism of municipal …

Municipal solid waste incineration fly ash (MSWIFA) needs proper treatment prior to security landfilling because of considerable amounts of heavy metals and soluble chloride. ... The effects of the technical parameters (alkali activator, sodium silicate modulus, alkali equivalent, water-solid ratio, curing regime) on the immobilization ...

WhatsApp: +86 18221755073

A Ten-Year Study on Alkali Content of Coal Fly Ash

The scope of this paper is to assess the alkaline content of coal fly ash over a period of 10 years. The Na2O-equivalent of coal fly ash ranged from 0.35% to 2.53%, with an average value of 0.79%.

WhatsApp: +86 18221755073

Texas Department of Transportation Fly Ash Database and the …

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 …

WhatsApp: +86 18221755073

Micro/meso scales characterization of alkali-activated fly ash-slag

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 ...

WhatsApp: +86 18221755073

Immobilization properties and reaction mechanism of municipal …

Municipal solid waste incineration fly ash ... The effects of the technical parameters (alkali activator, sodium silicate modulus, alkali equivalent, water-solid ... (HW18, code 772-002-18) [5]. Among them, the content of calcium salt and chlorine salt accounts for about 60–70 %, the proportion of soluble chlorine salt can be as high as ...

WhatsApp: +86 18221755073

Final Report April 2015

Technical Report Documentation Page 1. Report No. 2. Government Accession No. 3. Recipient's Catalog No. IHRB Project TR-628 4. Title and Subtitle 5. Report Date Alkali Content of Fly Ash – Measuring and Testing Strategies for Compliance April 2015 6. Performing Organization Code 7. Author(s) 8. Performing Organization Report No.

WhatsApp: +86 18221755073

Study on the Inhibition Effect of Fly Ash on Alkali–Silica

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 …

WhatsApp: +86 18221755073

Solutions