EP 2 838 574 B1

Admixture and method for freeze-thaw damage resistance and scaling damage resistance of cementitious compositions

(22) 19.04.2013

(43) 25.02.2015

(45) 09.03.2016

Description: Provided are a freeze-thaw damage resistance and scaling damage resistance admixture and a method of preparing a freeze-thaw damage resistant and scaling damage resistant cementitious composition.

Freeze-thaw cycles can be extremely damaging to water-saturated hardened cementitious compositions, such as concrete. The best known technique to prevent or reduce the damage done is the incorporation in the composition of ­microscopically fine pores or voids. The pores or voids function as internal expansion chambers and can therefore protect the composition from freeze-thaw damage by relieving changes in hydraulic pressure caused by freeze-thaw cycling. A conventional method used for producing such voids in cementitious compositions is by introducing air-entraining agents into the compositions, which stabilize tiny bubbles of air that are entrapped in the composition during mixing. […]

(73) Construction Research & Technology GmbH, 83308 Trostberg (DE)

(84) AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

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