A new approach in quantitative in-situ XRD of cement pastes: Correlation of heat flow curves with early hydration reactions

Hesse, Christoph; Goetz-Neunhoeffer, F.; Neubauer, J.

doi:10.1016/j.cemconres.2010.09.014

Cited by 293 publications

(86 citation statements)

References 25 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The neat 160 system was dominated by one peak, associated with alite hydration, followed by a very slight hump 161 after 1 day, indicative of secondary aluminate reaction upon sulphate depletion 34,35,36 . The addition 162 of slag was accompanied by an increase in the maximum heat rate of the alite phase; characteristic 163 of the filler effect exacerbating clinker hydration.…”

Section: Hydration Kineticsmentioning

confidence: 99%

“…Slags, whose slow hydration needs activation, produce analogous hydration products to cement, 36 mainly a C-S-H, albeit with a lower Ca/Si ratio and increased Al/Si 7,8 . Furthermore, a change in 37 aluminate, carbonate and sulphate content can further upset the hydrate assemblage, especially the 38 ettringite and AFm distribution 9 , while, a hydrotalcite-like phase may also form 1 .…”

mentioning

confidence: 99%

See 1 more Smart Citation

The role of the alumina content of slag, plus the presence of additional sulfate on the hydration and microstructure of Portland cement-slag blends

Whittaker

Zając

Haha

et al. 2014

Cement and Concrete Research

150

View full text Add to dashboard Cite

ReuseUnless indicated otherwise, fulltext items are protected by copyright with all rights reserved. The copyright exception in section 29 of the Copyright, Designs and Patents Act 1988 allows the making of a single copy solely for the purpose of non-commercial research or private study within the limits of fair dealing. The publisher or other rights-holder may allow further reproduction and re-use of this version -refer to the White Rose Research Online record for this item. Where records identify the publisher as the copyright holder, users can verify any specific terms of use on the publisher's website. TakedownIf you consider content in White Rose Research Online to be in breach of UK law, please notify us by emailing eprints@whiterose.ac.uk including the URL of the record and the reason for the withdrawal request. Abstract: The effects on composite cements of the aluminium content of slag plus that of additional sulphate, has been investigated. Samples containing cement or composites with 40% replacement by one of 2 different slags, differing in aluminium contents, were prepared. A further blended sample was prepared with additional anhydrite replacing 3%w/w of binder. Slag blended mortars showed comparable strengths to the neat cement system at later ages. Adding slag changed the hydration kinetics of the clinker phases. The addition of sulphate had no effect on slag reactivity but increased that of alite. Slags richer in aluminium resulted in greater incorporation of aluminium into C-S-H and encouraged the presence of hemicarbonate over monocarbonate. The Ca/Si ratios of the C-S-H formed were comparable between the two blends, being marginally lower than that of the neat system. The addition of anhydrite resulted in the adsorption of sulphate onto the C-S-H, plus stabilisation of ettringite. Corresponding Author 8 9 The Role of the Alumina Content of Slag, plus the Presence of AdditionalAbstract 10 The effects on composite cements of the aluminium content of slag plus that of additional sulphate, 11 has been investigated. Samples containing cement or composites with 40% replacement by one of 2 12 different slags, differing in aluminium contents, were prepared. A further blended sample was 13 prepared with additional anhydrite replacing 3%w/w of binder. Slag blended mortars showed 14 comparable strengths to the neat cement system at later ages. Adding slag changed the hydration 15 kinetics of the clinker phases. The addition of sulphate had no effect on slag reactivity but increased 16 that of alite. Slags richer in aluminium resulted in greater incorporation of aluminium into C-S-H and 17 encouraged the presence of hemicarbonate over monocarbonate.

show abstract

Section: Hydration Kineticsmentioning

confidence: 99%

mentioning

confidence: 99%

The role of the alumina content of slag, plus the presence of additional sulfate on the hydration and microstructure of Portland cement-slag blends

Whittaker

Zając

Haha

et al. 2014

Cement and Concrete Research

150

View full text Add to dashboard Cite

show abstract

“…This methodology allows understanding the chemical origin of different regions/features in the calorimetric curves (hydration reactions) and also supports the accuracy of RQPA (Hesse et al 2011). This type of study was initially carried out for synthetic cement and later used to characterize the hydration of alite including the ACn content which was determined by the external standard, G-method, approach (Jansen et al 2011b).…”

Section: Calorimetric Datamentioning

confidence: 99%

Rietveld Quantitative Phase Analysis of OPC Clinkers, Cements and Hydration Products

Aranda

Torre

León‐Reina

2012

Reviews in Mineralogy and Geochemistry

142

View full text Add to dashboard Cite

“…The second maximum heat flow reaches 3.3 mW per gram of OPC. After the peak of heat flow the curve starts to go down into a platform, which is believed a sign of depletion of the calcium sulphate phases and is assigned to a second aluminate reaction resulting in the formation of ettringite or monosulfoaluminate [7,8]. In the case of neat HBC hydration the induction period starts after 2.4 hours of hydration and the acceleration period begins after 8.6 hours.…”

Section: Experimental Methodsmentioning

confidence: 99%

Hydration of High Belite Cement

Chen¹,

Zhang²,

Liu³

2017

dtetr

View full text Add to dashboard Cite

A new type of cement, namely the high-belite cement (HBC) has been made in industrial scale in a trial production in China. The kiln feed raw mix proportions are adjusted so as to produce a clinker with the belite phase proportion as high as 60-70%, and alite phase around 15-20%. HBC produced during the trial production was collected and stored. This paper studied the hydration mechanism and hydration product of the new HBC cement. For comparison purpose, both HBC and ordinary Portland cement (OPC) samples were hydrated for various ages and the cement pastes were analyzedfor theirhydration and hardening mechanism using isothermal calorimetry, TG/DTA and XRD.

show abstract

A new approach in quantitative in-situ XRD of cement pastes: Correlation of heat flow curves with early hydration reactions

Cited by 293 publications

References 25 publications

The role of the alumina content of slag, plus the presence of additional sulfate on the hydration and microstructure of Portland cement-slag blends

The role of the alumina content of slag, plus the presence of additional sulfate on the hydration and microstructure of Portland cement-slag blends

Rietveld Quantitative Phase Analysis of OPC Clinkers, Cements and Hydration Products

Hydration of High Belite Cement

Contact Info

Product

Resources

About