Adsorption of Lignosulphonates on Cement and the Hydration Products of Cements

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Title: Adsorption of Lignosulphonates on Cement and the Hydration Products of Cements

Author(s): B.O. Myrvold

Publication: Special Publication

Volume: 239

Issue:

Appears on pages(s): 285-296

Keywords: adsorption; cement; clinker; hydration products; lignosulphonates

Date: 10/1/2006

Abstract:
The adsorption of sodium lignosulphonate onto cement was investigated. The cement has either been pre-hydrated or hydrated with the lignosulphonate present. The pre-hydrated cement particles grow with time, thus a larger surface is created and the plateaus in the adsorption isotherms increase. With lignosulphonate present there is hardly any growth of new surface. It is found that, a lignosulphonate that adsorbs strongly to the surface causes, less retardation than weakly adsorbed lignosulphonates. This can be explained by different interactions with the different minerals present.