On the cause of the anomalous setting behaviour with respect to temperature of calcium aluminate cements

Bushnell-Watson, S.M.; Sharp, J H

doi:10.1016/0008-8846(90)90002-f

Cited by 45 publications

(17 citation statements)

References 8 publications

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“…It is known that calcium aluminate cement (CAC) reaction with water generates various types of CAC hydrates, such as CaO·Al 2 O 3 ·10H 2 O (CAH 10 ), 2CaO·Al 2 O 3 ·8H 2 O (C 2 AH 8 ), 3CaO·Al 2 O 3 ·6H 2 O (C 3 AH 6 ) and Al 2 O 3 ·3H 2 O (AH 3 ) . It has been established that CAH 10 forms at lower temperatures (below 15°C), C 2 AH 8 and AH 3 are the main hydration products between 15 and 25°C, and C 3 AH 6 and gibbsite AH 3 are the hydrates at temperatures above 40°C and especially above 60°C . As CAH 10 and C 2 AH 8 phases are thermodynamically metastable, these phases convert into C 3 AH 6 and AH 3 when the hydration temperature is raised above 40°C or when the curing time is extended .…”

Section: Introductionmentioning

confidence: 99%

“…[1][2][3][4] It has been established that CAH 10 forms at lower temperatures (below 15°C), C 2 AH 8 and AH 3 are the main hydration products between 15 and 25°C, and C 3 AH 6 and gibbsite AH 3 are the hydrates at temperatures above 40°C and especially above 60°C. 1,2,[5][6][7] As CAH 10 and C 2 AH 8 phases are thermodynamically metastable, these phases convert into C 3 AH 6 and AH 3 when the hydration temperature is raised above 40°C or when the curing time is extended. [7][8][9] The conversion of CAC hydrates first attracted full attention in 1973-74 because the roofs collapsed in 3 different buildings in the UK and one of the 3 failures was directly attributed to loss of strength of the reinforced concrete beams.…”

Section: Introductionmentioning

confidence: 99%

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Conversion of calcium aluminate cement hydrates at 60°C with and without water

Zhang

et al. 2018

J Am Ceram Soc

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There have been different hypotheses about the transformation mechanisms of calcium aluminate cement hydrates and this work aims to clarify the long‐running debate about the conversion approaches. In this work, CAH10 and C2AH8 were produced from the pastes of calcium aluminate cement (CAC) cured for 24 hours at 10 and 20°C separately. And the cured pastes were continually cured at 60°C for 3 days with water and without water, respectively. The hydration of the pastes was halted by freeze‐drying, and the phases and microstructure of hydrates were investigated by XRD and SEM, respectively. The results indicate that CAH10 and C2AH8 converted into C3AH6 and AH3 in water presence at 60°C, but did not transform into C3AH6 and AH3 without water. It is confirmed that the conversion of CAH10 and C2AH8 to C3AH6 and AH3 happens through preceding solution of CAH10 and C2AH8 and subsequent precipitation of C3AH6 and AH3.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Conversion of calcium aluminate cement hydrates at 60°C with and without water

Zhang

et al. 2018

J Am Ceram Soc

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“…According to (Watson et al, 1990) the processess of setting and of nucleation and growth of the first hydrate are intimately linked. For a retarded set the nucleation is lower than at higher or lower temperatures.…”

Section: Resultsmentioning

confidence: 99%

A Thermal Analysis Study on Blended Ternary Cement Paste

Nithya¹,

Barathan²,

Govindarajan³

et al. 2010

IJC

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Pastes containing High Alumina Cement (HAC) and Ordinary Portland Cement (OPC) were prepared using Ground Water (GW) and 5, 10, 15 and 20%SF. The setting time and compressive strength of these admixtured cement pastes were measured. The hydrated HAC blends were subjected to DTA/TG and DSC analysis. The recorded spectra were compared with the observed mechanical measurements of these blends. The hydration kinetics is well explained through these results. It is evidenced that 10%SF addition is optimum for this blend.

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“…This could be pointing to the fibers that, due to their water retention capability, keep the surrounding area hydrated, enhancing the phase transformation. Since the change from CAH 10 to C 3 AH 6 þ2AH 3 is known to produce a volume reduction [37,38,41], the matrix presents higher porosity in this areas. As shown in Fig.…”

Section: Microstructurementioning

confidence: 99%

Surface modification of flax nonwovens for the development of sustainable, high performance, and durable calcium aluminate cement composites

Gonzalez-Lopez

Claramunt

Hsieh

et al. 2020

Composites Part B: Engineering

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The aim of this paper is to evaluate the influence of sustainable surface treatments-performed on flax nonwoven fabrics as textile reinforcement-on the durability of calcium aluminate cement (CAC) based composites. Two treatments are considered: an alkaline treatment (for increased stability and adhesion), and a treatment with soybean oil (to reduce fiber degradation). The cement hydration was studied by analysis of backscattered scanning electron microscopy images, which revealed variations nearby the fibers owing their capacity for water absorption and presence of oil on the surface. A retarding effect on cement hydration was observed on the composites prepared with the oil-treated fabrics. The composites containing the alkali treated fabrics had better mechanical properties and also the highest durability. For these composites it was found an optimized fiber-matrix adhesion and penetrability of the cement to the fabric.

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On the cause of the anomalous setting behaviour with respect to temperature of calcium aluminate cements

Cited by 45 publications

References 8 publications

Conversion of calcium aluminate cement hydrates at 60°C with and without water

Conversion of calcium aluminate cement hydrates at 60°C with and without water

A Thermal Analysis Study on Blended Ternary Cement Paste

Surface modification of flax nonwovens for the development of sustainable, high performance, and durable calcium aluminate cement composites

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