Dubina, Elina, Sieber, Roland, Plank, Johann and Black, Leon (2008) Effects of pre-hydration on hydraulic properties on Portland cement and synthetic clinker phases. In: Fentiman, C.H. and Mangabhai, R.J., (eds.) Cement and Concrete Science : Proceedings. 28th Cement and Concrete Science, 15-16 September 2008, Manchester, England. Cement and Concrete Science . ISBN 13 978-0-9553296-3-0Full text available as:
Available under License : See the attached licence file.
The ageing of cements (CEM I 52,5 R and API Oilwell Class G) and also the pure cement clinker minerals (C3S, pure C3A, Na2O-doped C3A, C4AF and calcium sulphate hemihydrate) has been studied at 60% and 85% RH using in-situ XRD, calorimetry, ESEM, XPS and FTIR-ATR. This combination of techniques has identified the key components involved in the surface pre-hydration process. Pre-hydration of cement leads to retardation of hydration. In-situ XRD shows the retardation of Portlandite formation after prehydration, which explains the heat development seen via calorimetry. XPS and ESEM investigations show surface modification after prehydration for C3S, C3A and doped C3A (4% Na2O). Pre-hydration of cement leads to modification of the surface area and surface charge, which can strongly influence the reactivity of bulk cements and their interaction with admixtures. This is relevant to the quality of cement during storage.
|Item Type:||Proceedings Paper|
|Copyright, Publisher and Additional Information:||Copyright 2008 Cement and Concrete Science. Uploaded with permission from the publisher.|
|Academic Units:||The University of Leeds > Faculty of Engineering (Leeds) > School of Civil Engineering (Leeds)|
|Depositing User:||Ms Caroline Wilson|
|Date Deposited:||13 Oct 2008 16:48|
|Last Modified:||08 Feb 2013 17:05|
|Publisher:||Cement and Concrete Science|
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