Reactivity of calcium dialuminate (CaAl4O7) refractory cement with lithium carbonate (Li2CO3) admixture

Tchamba, Arlin Bruno; Mbessa, Michel; Yannick, Tchedele Langollo; Waida, Sandra; Elimbi, A.; Melo, Uphie Chinje; Bier, Thomas

doi:10.1080/21870764.2020.1724246

Cited by 3 publications

(3 citation statements)

References 15 publications

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“…with q = 0.26, where D I and D S are, respectively, the dimension of the largest and the smallest particles [1,[8][9][10][11].…”

Section: Sample Preparationmentioning

confidence: 99%

“…Therefore, it is imperative to obtain a high performance at temperature where CAC does not show its optimized properties, where additives/admixtures leading to liquid formation and consequently faster densification present an interesting technological alternative. Another point of view from previous works states that a little amount of Li 2 CO 3 (0.1 wt.%) improves the reactivity of CA 2 cement by reducing the reaction peak time from 17 h to 23 min [10].…”

Section: Introductionmentioning

confidence: 99%

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Influence of lithium carbonate and superplasticizer as admixtures on low calcium dialuminate cement castable submitted to thermal shock

Tchamba

Nkeng

Randy

et al. 2021

Journal of Asian Ceramic Societies

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The purpose of this study was to investigate the hot properties of low calcium dialuminate cement castable as binder with varying amount of Li 2 CO 3 and castament FS20 superplasticizer as admixtures. Thermal damage test was carried out through quenching in air for five cycles ΔT = 1175°C. The samples were preheated at 1500°C for 2 h. The results gave a retained Young's modulus of low-cement castable with 0.3 wt.% Li 2 CO 3 and 0.5 wt.% castament down to 10.36% while 0.1 wt.% Li 2 CO 3 and 0.5 wt.% castament showed a retained modulus down to 13.47%. For the samples without admixture, the loss of Young modulus was 92.4% and 93.7% with 0.3 wt.% of Li 2 CO 3 admixture. The superplasticizer has a great effect on thermal shock resistance of low calcium dialuminate cement castable. The results confirmed that 0.1 wt%Li 2 CO 3 and 0.5 wt% castament have better thermal shock resistance and longer service life for applications in refractories. The increase of mass of the refractory materials during five thermal shock cycles in air is the main factor affecting the degradation of this refractory material due to the oxidation of SiC to SiO 2 .

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“…with q = 0.26, where D I and D S are, respectively, the dimension of the largest and the smallest particles [1,[8][9][10][11].…”

Section: Sample Preparationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Influence of lithium carbonate and superplasticizer as admixtures on low calcium dialuminate cement castable submitted to thermal shock

Tchamba

Nkeng

Randy

et al. 2021

Journal of Asian Ceramic Societies

Self Cite

View full text Add to dashboard Cite

show abstract

“…Antonovich et al [ 11 ] discovered that adding SiO 2 micro-particles to a fresh castable mixture enhances the compressive strength up to three times for reference castables without these additives. Reacting with SiO 2 micro-particles, the CAC minerals form stratlingite minerals [ 12 ]. Şengül and Erdoğan [ 13 ] found a positive correlation between the stratlingite concentration and the cold compressive strength (CCS).…”

Section: Introductionmentioning

confidence: 99%

Investigating the High-Temperature Bonding Performance of Refractory Castables with Ribbed Stainless-Steel Bars

Plioplys,

Antonovič,

Boris

et al. 2024

Materials

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Refractory materials containing calcium aluminate cement (CAC) are commonly used in the metallurgical and petrochemical industries due to their exceptional mechanical resistance, even at temperatures exceeding 1000 °C, and do not require additional reinforcement. This study seeks to advance this practice by developing ultra-high-performance structures that offer building protection against fire and explosions. Such structures require bar reinforcement to withstand accidental tension stresses, and the bond performance becomes crucial. However, the compressive strength of these materials may not correlate with their bond resistance under high-temperature conditions. This study investigates the bond behavior of ribbed stainless austenitic steel bars in refractory materials typical for structural projects. The analysis considers three chamotte-based compositions, i.e., a conventional castable (CC) with 25 wt% CAC, a medium-cement castable (MCC) with 12 wt% CAC, a low-cement castable (LCC), and a low-cement bauxite-based castable (LCB); the LCC and LCB castables contain 7 wt% CAC. The first three refractory compositions were designed to achieve a cold compressive strength (CCS) of 100 MPa, while the LCB mix proportions were set to reach a CCS of 150 MPa. Mechanical and pull-out tests were conducted after treatment at 400 °C, 600 °C, 800 °C, and 1000 °C; reference specimens were not subjected to additional temperature treatment. This study used X-ray fluorescence (XRF), X-ray diffraction (XRD), and scanning electron microscopy (SEM) methods to capture the material alterations. The test results indicated that the bonding resistance, expressed in terms of the pull-out deformation energy, did not directly correlate with the compressive strength, supporting the research hypothesis.

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Preparation of Li2CO3 powder nanoparticles by vacuum freeze drying

et al. 2021

Ceramics International

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Reactivity of calcium dialuminate (CaAl₄O₇) refractory cement with lithium carbonate (Li₂CO₃) admixture

Cited by 3 publications

References 15 publications

Influence of lithium carbonate and superplasticizer as admixtures on low calcium dialuminate cement castable submitted to thermal shock

Influence of lithium carbonate and superplasticizer as admixtures on low calcium dialuminate cement castable submitted to thermal shock

Investigating the High-Temperature Bonding Performance of Refractory Castables with Ribbed Stainless-Steel Bars

Preparation of Li2CO3 powder nanoparticles by vacuum freeze drying

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