Conference Paper, 26. Konferenz „Rheologische Messungen an mineralischen Baustoffen“, 2017, Regensburg
Starch ethers are added to mortars in order to modify the rheology of the fresh mortar by bridging flocculation. The proper function as flocculant for cement requires that the starch ether molecules possess anionic charged functional groups. With this in mind, the different types of commercially available starch ethers are evaluated. Two types of starch ethers can be dis-tinguished, which differ in the dependence of the effect on dosage. All starch ethers are anionic charged at pH values above 11. At neutral pH, CM-HP-starches are more efficient flocculants than HP-starch.