Express-Method for Determination of Compressive Strength of Geopolymer Based on Low-Calcium Fly Ash

Nowadays, the production of high-performance composites is a relevant objective in construction industry. Normally, geological and/or technological conditions of phase formation are responsible for chemical and structural characteristics of raw materials. In this regard, the use of a certain material dictates terms to optimizing production process, efficient use and, therefore, requires to develop a method for quality evaluation of raw materials. This approach allows a considerable time saving and raw materials sources, while the evaluation of final performance characteristics of designed materials is being done. The biggest interest in this area is focused on new types of developed and poorly-studied composite systems which results in a lack of capacity to design materials with known performance and, therefore, constrains the areas of application of construction composites Among such composite systems there are zero cement alkali-aluminosilicate systems or geopolymers. For geopolymers production a wide range of different aluminosilicates with varied characteristics potentially can be used. And also, in each certain case, the quality evaluation methods for aluminosilicates should be different. This study is focused on chemical reactivity assessment method of crystalline (mainly, nanocrystalline) low calcium aluminosilicates exposed to high-alkali media. The solubility degree in high-alkali media and compressive strength performance were evaluated in this study in order to define chemical reactivity of low calcium aluminosilicates. The compressive strength data demonstrated a positive correlation with the crystallinity degree of aluminosilicates.

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Chemical Reactivity Assessment Method of Nanostructured Low Calcium Aluminosilicates

Kozhukhova

Строкова

Chizhov

et al. 2020

Construction Materials and Products

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Correlation of Quality Assessment Methods of Class F Fly as for Synthesis of Geopolymers

Kozhukhova

Zhernovskaya

Kozhukhova

et al. 2019

MSF

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The demand of highly effective aluminosilicates such as class F fly ash for use in geopolymer synthesis initiated a strong scientific interest for a design of the quality assessment methods. At the same time, the existing assessment methods apparently differ in key parameters which determine the quality of aluminosilicate. This research was focused on determination of relationship between the key parameters of different assessment methods for different types of low-calcium fly ash with high portion of vitreous phase. The insoluble aluminosilicate portion in fly ash that remained after treatment in aggressive acidic media followed by high-temperature treatment at 1000 °C (or the parameter α) was measured in this study. The experimental data showed a very low correlation (R2=0.34) between parameter α and compressive strength of the fly-ash based geopolymer paste. The correlation factors between such genetic parameters of fly ash as portion of vitreous phase (C), SiO2-bonding degree in vitreous phase (fSi) and parameter α demonstrated dramatically different values: R2 (С-α)=0.01; R2(fSi-α)=0.71; R2 (С-fSi)=0.0, respectively.

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Express-Method for Determination of Compressive Strength of Geopolymer Based on Low-Calcium Fly Ash

Abstract: Жерновский Игорь Владимирович, кандидат геолого-минералогических наук, профессор кафедры материаловедения и технологии материалов.

Cited by 2 publications

References 5 publications

Chemical Reactivity Assessment Method of Nanostructured Low Calcium Aluminosilicates

Chemical Reactivity Assessment Method of Nanostructured Low Calcium Aluminosilicates

Correlation of Quality Assessment Methods of Class F Fly as for Synthesis of Geopolymers

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