Microstructural and 29Si MAS NMR spectroscopic evaluations of alkali cationic effects on fly ash activation

Peng, Zihui; Vance, Kirk; Dakhane, Akash; Marzke, R. F.; Neithalath, Narayanan

doi:10.1016/j.cemconcomp.2014.12.005

Cited by 66 publications

(21 citation statements)

References 51 publications

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“…This promotes the dissolution of Si and Al which results in higher Si/Al in the SW based AAM. Similar observations were drawn by Peng et al on investigating the influence of alkali cation on microstructure of AAM [36]. Additionally, from Figure 6, it can be observed that the intensity of peaks after deconvolution depicts a slightly better structured spectra for SW-based AAM as compared to PW-and TW-based mixes.…”

Section: Ft-irsupporting

confidence: 86%

Mechanical Properties, Microstructure, and Chloride Content of Alkali-Activated Fly Ash Paste Made with Sea Water

Siddique

Jang

2020

Materials

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The aim of the present study is to investigate the potential of sea water as a feasible alternative to produce alkali-activated fly ash material. The alkali-activated fly ash binder was fabricated by employing conventional pure water, tap water, and sea water based alkali activating solution. The characteristics of alkali-activated materials were examined by employing compressive strength, mercury intrusion porosimetry, XRD, FT-IR, and 29Si NMR along with ion chromatography for chloride immobilization. The results provided new insights demonstrating that sea water can be effectively used to produce alkali activated fly ash material. The presence of chloride in sea water contributed to increase compressive strength, refine microstructure, and mineralogical characteristics. Furthermore, a higher degree of polymerization on the sea water-based sample was observed by FT-IR and 29Si NMR analysis. However, the higher amount of free chloride ion even after immobilization in sea water-based alkali-activated material, should be considered before application in reinforced structural elements.

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Section: Ft-irsupporting

confidence: 86%

Mechanical Properties, Microstructure, and Chloride Content of Alkali-Activated Fly Ash Paste Made with Sea Water

Siddique

Jang

2020

Materials

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“…where:  is the surface tension of mercury, 0.485 N/m at 25 o C; P is the intrusion pressure (N/m 2 );  is the wetting angle for mercury, assuming to be 130 o . The threshold pore size, corresponding to the peak in the pore size-differential volume relationship, is found to be effective in the comparative studies [34,53] and it has been used for permeability predictions [32][33][34]54].…”

Section: Mercury Intrusion Porosimetrymentioning

confidence: 99%

Characterisation of temporal variations of alkali-activated slag cement property using microstructure features and electrical responses

Zhu

Yang

et al. 2020

Construction and Building Materials

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“…Basing on information given in [81] one may state that the increase of amount of aluminate species causes faster condensation rate. It happens because reactions of condensation are initiated by Al [22]. Thus, basing only on oxide chemical composition ( Fig.…”

Section: Moderately Concentrated Solutions Of Hydroxidesmentioning

confidence: 99%

“…For such transformations, starting aluminosilicate material needs strong alkaline medium and it also often requires elevated temperature. Some researchers pointed out that the presence of calcium components (introduced, e.g., with slag or small amount of cement) in the starting material causes that the development of suitable properties of the final material may be obtained without heat treatment [22,23].…”

Section: Introductionmentioning

confidence: 99%

Comparative investigation of reactivity of different kinds of fly ash in alkaline media

Wilińska

Pacewska

2019

J Therm Anal Calorim

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Comparison of the influence of temperature and different alkali activators on the reactivity of two types of fly ash (conventional, fluidized) was presented. The main emphasis was put on fluidized fly ash as potential component of binding mixtures containing low amount of cement. Conventional fly ash was used as a reference. It was found that for these materials the key differences affecting products of activation are: availability of calcium and sulfate ions as well as structure of fly ash grains influencing dissolution of aluminate and silicate species. Fluidized fly ash, contrary to conventional fly ash, undergoes reaction in 0.1 M solutions of hydroxides forming mainly ettringite. In the case of 4 M hydroxides, both fly ashes undergo hydration processes. Conventional fly ash formed mainly amorphous aluminosilicate gel, while fluidized fly ash may create zeolitic products especially in the case of elevated temperature of early hydration. Sulfate and alkali ions can be incorporated into aluminosilicate structure of new formed products; however, this process depends strictly on the type of used hydroxide and its concentration. The presence of Ca(OH) 2 , carbonates and alkali sulfates was also registered in the case of hydrated fluidized fly ash.

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Microstructural and 29Si MAS NMR spectroscopic evaluations of alkali cationic effects on fly ash activation

Cited by 66 publications

References 51 publications

Mechanical Properties, Microstructure, and Chloride Content of Alkali-Activated Fly Ash Paste Made with Sea Water

Mechanical Properties, Microstructure, and Chloride Content of Alkali-Activated Fly Ash Paste Made with Sea Water

Characterisation of temporal variations of alkali-activated slag cement property using microstructure features and electrical responses

Comparative investigation of reactivity of different kinds of fly ash in alkaline media

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