Production and characterization of high-reactivity metakaolins calcined in flash reactor

Inocente, Jordana Mariot; Elyseu, Fábio; Nieves, Leidy Johana Jaramillo; Jiusti, Jeanini; Cargnin, Maykon; Peterson, Michael

doi:10.1016/j.clay.2021.106247

Cited by 16 publications

(10 citation statements)

References 46 publications

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“…The common means of activation are calcination at a high temperature, alkali excitation, and ion mixing. High-temperature calcination involves the breaking of the Si-O bond and Al-O bond in BA at the high temperature to obtain the activity (Inocente et al 2021). Li used this method to improve the mechanical properties of concrete products, with compressive strength up to 18.3MPa (Li et al 2021).…”

Section: Introductionmentioning

confidence: 99%

Preparation of Ni–Co ore mining mullock powder based cementing materials by mechano-chemical activation: Performance and Mechanism

Xiang

Lan

Cai

et al. 2023

Preprint

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How to effectively recycle Ni–Co ore mining mullock (OMM) is a key means to address both local environmental pollution and resource waste. In this study, OMM and bottom ash (BA) were prepared into cementitious materials (OBM) by mechanochemical means with gentle conditions. It is mainly realized by grinding the mixture and pressing it into columnar blocks. The results show that the maximum compressive strength of OBM is 4.803 MPa in 28 day meet the standard of China mine backfilling for mine repair, and the stability efficiency of Ni2+ and Co2+ is above 90%. The mechanism studies show that the amorphous materials recombine to form silicon-aluminum polymers, while a small portion of Ni2+ and Co2+ binds to the polymer during consolidation to form massive structure. Most of the heavy metal ions are encased in the hard structure, which is relatively stable and without pollution risk. The chemical behavior of metals in the system is fitted by geochemical model. This study not only solved the problem of heavy metal contamination in OMM, but also transformed it into a cementitious material that can be used for backfilling of local pits.

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Section: Introductionmentioning

confidence: 99%

Preparation of Ni–Co ore mining mullock powder based cementing materials by mechano-chemical activation: Performance and Mechanism

Xiang

Lan

Cai

et al. 2023

Preprint

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“…Commonly used blending components include fly ash (FA), rice husk ash (RHA), granulated slag (GS), silica fume (SF), calcined clay (CC), and construction debris waste (CDW) powder [6][7][8][9][10][11][12]. There have been extensive studies reporting their suitability and application range as potential cementitious materials for green concrete [13][14][15][16][17][18][19][20]. Generally speaking, each of them vary in their micro-structural features, elemental compositions and therefore, inevitably, in their chemical reactivity with water.…”

Section: Introductionmentioning

confidence: 99%

“…Advantages and working range of bagasse ash and fly ash were also studied as potential replacement as cementitious materials with remarkable performance on the compressive strength of the concrete [8][9]. On the other hand, the micro-structural properties of metakaolin and micro-silica are found to benefit the calcite-bonding of high performance concrete when they applied separately [10][11][12][13][14][15][16]. In the absence of micro-fibres, metakaolin has reported higher strength and durability characteristics compared to the micro-silica mixtures [13,16].…”

Section: Introductionmentioning

confidence: 99%

A Compensatory Approach for Enhancing the Strength and Durability of Green Concrete Composites (GCC) with Multiple Combinations of Recyclable Pozzolanic Materials (RPM)

ARIYAGOUNDER,

MANGOTTIRI

2023

Preprint

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Recyclable Pozzolanic materials (RPM) derived from wastes are increasingly used in mortar and concrete for a number of purposes, chief among them being the reduction of cement quantity, which lowers construction costs as well as carbon footprint. Among these, the most often used mixture ingredients in concrete are fly ash (FA), rice husk ash (RHA), palm oil fuel ash (POFA), granulated slag (GS), silica fume (SF), construction debris waste powder (CDW), and calcined clay (CC). Recent studies reveal that they are reasonable to impart mechanical strength when applied individually; however, their combined effects are not extensively investigated due to the characteristic conflicts existing in their elemental composition and the resulting pozzolanic activities. We present a comprehensive evaluation of durability and strength properties of different combinations of binary and ternary replacements of specific pozzolanic components in varying amounts (5%, 10%, 15%, and 20%). These combinations were so chosen as to provide a compensatory effect on the apparent binding properties based on the difference in their geometry and composition. The results indicate that 5% of the ternary combination had good corrosion resistance and durability, whereas 10% of the single mode, 5% of the binary mode, and 5% of the ternary mode have high mechanical properties, durability, and resistance to corrosion. These insightful findings show that use of optimized mixtures of composite pozzolanic materials can improve the mechanical properties of concrete mixes by compensating each other for their intrinsic limitations, thereby ensuring higher sustainability towards green concrete applications.

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“…Heat treatment through “direct” or traditional calcination using a laboratory kiln has already been studied in sediments to improve some properties [ 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 , 28 ], but this method is expensive with high energy consumption and environmental impact. However, another innovative technique, called “flash calcination”, has been applied in some studies for the activation of clays and to transform kaolin into metakaolin [ 29 , 30 , 31 , 32 , 33 , 34 ]. Cremona et al [ 35 ] investigated the properties of fresh and hardened concrete and the durability of several metakaolin-based binders.…”

Section: Introductionmentioning

confidence: 99%

“…After testing cement replacement at 20, 30, and 40 wt%, the results clearly demonstrated that flash-calcined sediments are suitable for the production of sustainable cement and concrete. Inocente et al [ 33 ] recently used this activation technique to produce highly reactive metakaolin. The chosen calcination temperatures ranged from 900 °C to 1100 °C.…”

Section: Introductionmentioning

confidence: 99%

Designing Efficient Flash-Calcined Sediment-Based Ecobinders

2022

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To ensure the optimum navigation of boats and protection against flooding, waterways and ports are regularly dredged. The volume of dredged materials represents 56 million m3 in France and 300 million m3 in Europe. These materials show a high potential for a use as supplementary cementitious material (SCM). In this paper, sediments treated by the flash calcination method (STFC), which is based on a low-energy consumption process, are utilized as a mineral admixture in a cementitious matrix. The results of the physical, chemical, and mineralogical characterization prove that this heat treatment has an interesting impact on the final properties of the sediments. Mortars based on the flash-calcined product have comparable mechanical properties to control mortar. For a substitution rate below 10%, the performances are even equivalent to a metakaolin (MK80)-based mortar. Calorimetry testing demonstrated that calcined materials also improve hydration processes in the cement matrixes by generating additional heat release due to sediment pozzolanic activity. Across this study, it is shown that waste material including sediment can be transformed after optimized heat treatment into a valuable resource for the building and infrastructure sector.

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Production and characterization of high-reactivity metakaolins calcined in flash reactor

Cited by 16 publications

References 46 publications

Preparation of Ni–Co ore mining mullock powder based cementing materials by mechano-chemical activation: Performance and Mechanism

Preparation of Ni–Co ore mining mullock powder based cementing materials by mechano-chemical activation: Performance and Mechanism

A Compensatory Approach for Enhancing the Strength and Durability of Green Concrete Composites (GCC) with Multiple Combinations of Recyclable Pozzolanic Materials (RPM)

Designing Efficient Flash-Calcined Sediment-Based Ecobinders

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