Please wait.'

Page is loading'


Home  > Raw materials & technologies  > Applications  > Studying the shelf-life of cement blended...

Sunday, 15 September 2019
pdf
Raw materials & technologies, Applications

Studying the shelf-life of cement blended with redispersible polymer powder

Friday, 29 April 2016

German and Argentinian researchers studied the shelf-life of cement blended with redispersible polymer powder (RDP) used in drymix mortars after exposure to an atmosphere of elevated temperature (40 ± 1°C) and moisture (90 ± 3%RH) simulated in a climate chamber.

RDPs improve the shelf-life of cement via partial film formation. Source: Michael Bührke/pixelio.de

RDPs improve the shelf-life of cement via partial film formation. Source: Michael Bührke/pixelio.de

As RDP samples, ethylene–vinylacetate and carboxylated styrene–butadiene were used.

RDP protects cement from rapid aging

The behaviour of the cement/RDP blends was studied with respect to film formation of the RDPs and the mechanical properties of the resulting mortars. It was found that the presence of RDP decelerates the prehydration of cement in humid environment and thus improves its shelf-life. At the same time, cement triggers a partial premature film formation from RDP powder during aging. Furthermore, mortars containing aged cement/RDP blends retained their mechanical properties much better than mortars casted from cement which had been aged individually. Apparently, RDP can protect cement from rapid aging.

The study is published in: Construction and Building Materials, Volume 115, 15 July 2016, Pages 336–344

top of page
Comments (0)
Add Comment

Post comment

You are not logged in

register