Calcium Aluminate Cements

Ideker, Jason H.; Scrivener, Karen; Fryda, H.; Touzo, Bruno

doi:10.1016/b978-0-08-100773-0.00012-5

Cited by 35 publications

(29 citation statements)

References 46 publications

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“…The first peak occurs within the first minutes into the hydration process when water is added, which is related to the wetting and very early hydration reactions. After 10 h for CBA‐10 and after 5 h for CBA‐20, a small peak occurs followed by the main hydration peak at 11 h for CBA‐10 and at 8 h for CBA‐20, which is probably related to the formation of AFm and C 2 AH 8 phases, based on the literature 62 …”

Section: Resultsmentioning

confidence: 78%

Recycling of bone ash from animal wastes and by‐products in the production of novel cements

Duvallet

Jewell

2023

J Am Ceram Soc.

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The purpose of this research is to demonstrate the utilization of animal wastes and by-products in the production of low-energy and low-CO 2 clinkers and cements in order to preserve natural resources, such as limestone, while reducing CO 2 emissions released from the cement manufacturing process and reducing potential health risk to the world population (such as bovine spongiform encephalopathy or other health issues. . . ). Pure calcium sulfoaluminate clinker was produced with calcium hydroxide, aluminum hydroxide, and calcium sulfate hemihydrate; followed by additional clinkers produced from substituting calcium hydroxide with bone ash (from 0 to 100% of the calcium hydroxide replaced). The final clinkers contained various amounts of ye'elimite, calcium aluminate phases, as well as tricalcium phosphate, depending on the firing temperature. Finally, some preliminary results on the hydration process and compressive strength are provided for the production of these binders.

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Section: Resultsmentioning

confidence: 78%

Recycling of bone ash from animal wastes and by‐products in the production of novel cements

Duvallet

Jewell

2023

J Am Ceram Soc.

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“…It is considered to be an easily hydrated phase with slightly less reactivity than tricalcium aluminate (C 3 A). It is important in cements with high initial strength but in carefully controlled quantities [ 53 , 54 ]. Carvalho et al [ 55 ] noted that mayenite is acceptable in belitic cements, since it could result in the same increase in the initial mechanical strength.…”

Section: Resultsmentioning

confidence: 99%

Production of Belite Based Clinker from Ornamental Stone Processing Sludge and Calcium Carbonate Sludge with Lower CO2 Emissions

et al. 2022

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Environmental concerns have come to the forefront due to the substantial role of the cement industry in the extraction and expenditure of natural resources. Additionally, industrial processes generate a considerable amount of waste, which is frequently disposed of inadequately. The objective of this study was to evaluate the simultaneous use of ornamental rock processing sludge and calcium carbonate sludge generated from the kraft process in the production of belitic clinker. These waste materials would be used in total or partial substitution of natural raw materials, namely, limestone and clay. Several formulations were produced and sintered at 1100 and 1200 °C. The raw materials were characterized physico-chemically and thermogravimetrically, with subsequent evaluation of the resulting dosed raw mixes. Mineral analyses determined that the mixtures with limestone and clay in substitution ratios of 95% and 100%, respectively, and sintered at 1100 °C have the potential to produce belite-rich clinkers. This temperature is considerably lower than those reported in reference studies. Additionally, full limestone and clay substitution could result in a 23.92% reduction in carbon dioxide in clinker production. The results confirmed the potential use of ornamental rock processing sludge and calcium carbonate sludge as viable alternative materials for cement production and, consequently, could contribute to a reduction in the negative environmental impacts of this industry.

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“…In a hardened cementitious matrix, the formation of a new phase may lead to deleterious volumetric changes, depending on the relative densities of the precursor phase and the produced phase. For instance, the well‐known conversion process in high calcium aluminate cement leads to a loss in strength due to the significantly lower density of the precursor calcium aluminate phases (CAH 10 and C 2 AH 8 ; densities ≈ 1.95 g/cm 3 ) compared to the denser katoite product (density ≈ 2.8 g/cm 3 ) of the process 86 . Similary, the delayed ettringite formation leads to deleterious expansion in the hardened cementitious matrix, due to the difference in the density of ettringite (~1.8 g/cm 3 ) and the precursor phases (monosulfate ≈ 2.02 g/cm 3 , gypsum ≈ 2.3 g/cm 3 , C‐S‐H ≈ 2.2‐2.6 g/cm 3 ) from which it forms 87 .…”

Section: Resultsmentioning

confidence: 99%

Formation and stability of gismondine‐type zeolite in cementitious systems

et al. 2020

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Kinetic constraints often limit our understanding of the long-term chemistry and phase assemblage of hydrated cements, particularly alkali-activated materials, blended cements and cementitious materials of geothermal wells and radioactive waste repositories. For example, the mineralogy of geopolymer (an alkali-activated aluminosilicate binder) is often seen to feature a cluster of nanocrystalline zeolites, wherein the zeolite type and degree of crystallinity are mainly dependent on the cement formulation and curing conditions. 1-3 Available studies, in general, indicate that the conversion of amorphous phases to more ordered crystalline analog in alkali-activated materials is accelerated at moderately high temperatures and high humidity. 2-4 A variety of zeolites have been reported in alkali-activated materials, 5,6 including hydroxysodalite, 7,8 chabazite, 7,8 analcime 4,9 and gismondine (ie, zeolite P). 9-11

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Calcium Aluminate Cements

Cited by 35 publications

References 46 publications

Recycling of bone ash from animal wastes and by‐products in the production of novel cements

Recycling of bone ash from animal wastes and by‐products in the production of novel cements

Production of Belite Based Clinker from Ornamental Stone Processing Sludge and Calcium Carbonate Sludge with Lower CO2 Emissions

Formation and stability of gismondine‐type zeolite in cementitious systems

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