Hydration behavior of calcium aluminate cement mortars with mineral admixtures at different curing temperatures

Idrees, Maria; Ekincioglu, Ozgur; Sonyal, Muhammad Sarmad

doi:10.1016/j.conbuildmat.2021.122839

Cited by 40 publications

(16 citation statements)

References 25 publications

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“…The hydration products were mainly AH 3 , C 3 AH 6 , CAH 10 and C 2 AH 8 at room temperature. CAH 10 and C 2 AH 8 were chemically unstable, while AH 3 and C 3 AH 6 were relatively stable [19,20]. Therefore, CAH 10 and C 2 AH 8 changed into C 3 AH 6 with the increase of age and temperature.…”

Section: Composition and Microstructurementioning

confidence: 97%

Mechanical Performance of Textile Reinforced Concrete Containing Steel Fibers and Basalt Fibers Subjected to High Temperatures

Xu¹

2021

Ceramics - Silikaty

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Textile reinforced concrete (TRC) was prepared from high-alumina cement mixed with short-cut basalt fiber or steel fiber for the objective to analyze the mechanical performance and deterioration mechanism at high temperature. The results show that the high-temperature resistance of TRC matrix concrete can be improved by adding steel fibers and basalt fibers, but the compressive strength of concrete decreases with the increase of temperature in a quadratic parabolic law, while the flexural strength decreases in a linear law. The addition of basalt fiber significantly improves the bending bearing capacity of the TRC plates. In comparison, the addition of steel fiber significantly improves the flexural strength of TRC thin-plates above 600 °C. The scanning electron microscopy indicates that when the temperature surpasses 600 °C, the addition of basalt fiber and the steel fiber surface are significantly damaged by high-temperature deterioration. The deterioration of the mechanical performance of TRC thin-plates at high temperatures is caused mainly by changes in the chemical composition of the concrete matrix, deterioration of the fiber and damage of the bonding surface. The results obtained in this study can provide the theoretical support for the design and application of TRC in a high-temperature environment.

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Section: Composition and Microstructurementioning

confidence: 97%

Mechanical Performance of Textile Reinforced Concrete Containing Steel Fibers and Basalt Fibers Subjected to High Temperatures

Xu¹

2021

Ceramics - Silikaty

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“…The formation of C 3 AH 6 is always accompanied by detrimental effects such as microstructural degradation and strength loss. To avoid or inhibit the formation of C 3 AH 6 , a large amount (30–50%) of supplementary cementitious materials (SCMs) such as ground granulated blast furnace slag (GGBFS), silica fume (SF), and fly ash (FA) are incorporated into CAC to promote the formation of new stable hydrates C 2 ASH 8 . − However, due to the fact that these SCMs have relatively low reactivity or a high specific surface area, the composites suffer from poor early strength development and workability. In addition, there is still no consensus about the mechanism of C 2 ASH 8 formation.…”

Section: Introductionmentioning

confidence: 99%

Microstructure Evolution Mechanism of Quaternary Phase Paste Containing Metakaolin and Silica Fume

Ding

Lü

et al. 2023

ACS Sustainable Chem. Eng.

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To promote the sustainable development of high-performance calcium aluminate cement (CAC)-based material and the efficient utilization of supplementary cementitious materials (SCMs) in CAC, the evolution mechanism of the microstructure of quaternary phase (Q phase, Ca 20 Al 26 Mg 3 Si 3 O 68 ) paste containing metakaolin (MK) and silica fume (SF) was investigated. The strength of SF-blended paste decreases with time when cured at 40 °C, while that of MK-blended paste shows sustained strength gain. The microstructure of outer products (OPs) for SF-blended paste suffers from significant damage when the age increases from 3 to 28 d, whereas that for MKblended paste exhibits no significant difference, showing a dense morphology. The microstructure evolution of OP is mainly controlled by the reactions between SCMs (i.e., MK and SF) and early metastable hydrates (i.e., CAH 10 and C 2 AH 8 ). The dissolved silica from SF reacts with CAH 10 to form C 2 ASH 8 but cannot completely hinder its conversion to C 3 AH 6 , while the preferentially dissolved alumina from MK can stabilize CAH 10 due to the common-ion effect. As the rate of conversion of C 2 AH 8 to C 3 AH 6 is much faster than that of CAH 10 , the rapid conversion of C 2 AH 8 cannot be effectively suppressed by MK or SF.

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“…Idrees et al 23 , have tested the effect of mineral admixtures such as fly ash, granulated ground blast furnace slag, and silica fume on the properties of CAC mortars at different curing temperatures. It was found that the hydration reactions of CAC mortars were accelerated by using the mineral admixtures as sand replacement materials.…”

Section: Introductionmentioning

confidence: 99%

Maximize the use of municipal waste generated by the hydrogen peroxide industry in the production of high-quality refractory CAC

Amer

El-Maddah

Abuelela

et al. 2022

Sci Rep

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High-grade calcium aluminate cement (CAC) has been successfully synthesized from municipal alumina waste and limestone under mild reaction conditions. Mineralogical composition and microstructure of the sintered mixes were investigated using X-ray diffraction and FESEM; valuable cementing phases such as CA, CA2, and C12A7 were observed in addition to the C3A phase that was detected in the mixes with high CaCO3 content. Mix CA60 containing 60 wt% alumina waste has achieved the best sinterability (less than 1 vol% porosity) and the highest densification (~ 2.65 g/cm3 bulk density) at 1450 °C. Densification, cold-crushing strength (CCS), and microstructure of the hydrated cement samples (From Mix CA60) were investigated. The cast cement specimens revealed better density and CCS characteristics (63.1 and 74 MPa at 7 and 28 days, respectively) in comparison with the commercial cement. Conventional castables (5 × 5 × 5 cm3) were prepared from mixtures composed of 15 wt% cement and 85 wt% aggregates (40% Al2O3), where CA60 and commercial cement were used to compare the effect of the manufactured CA60 cement with the commercial one. The castables prepared with CA60 cement have shown a higher strength at 110 °C with 4.5 MPa when compared to the commercial CAC at the same temperature (1.8 MPa). Accordingly, this study contributes not only to preserving the environment from the accumulation of industrial wastes but also to valorizing and adding value to these wastes.

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Hydration behavior of calcium aluminate cement mortars with mineral admixtures at different curing temperatures

Cited by 40 publications

References 25 publications

Mechanical Performance of Textile Reinforced Concrete Containing Steel Fibers and Basalt Fibers Subjected to High Temperatures

Mechanical Performance of Textile Reinforced Concrete Containing Steel Fibers and Basalt Fibers Subjected to High Temperatures

Microstructure Evolution Mechanism of Quaternary Phase Paste Containing Metakaolin and Silica Fume

Maximize the use of municipal waste generated by the hydrogen peroxide industry in the production of high-quality refractory CAC

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