TY  - JOUR
A1  - Schirmer, Ulrike
A1  - Osburg, Andrea
T1  - A new method for the quantification of adsorbed styrene acrylate copolymer particles on cementitious surfaces: a critical comparative study
T2  - SN Applied Sciences
N2  - The amount of adsorbed styrene acrylate copolymer (SA) particles on cementitious surfaces at the early stage of hydration was quantitatively determined using three different methodological approaches: the depletion method, the visible spectrophotometry (VIS) and the thermo-gravimetry coupled with mass spectrometry (TG–MS). Considering the advantages and disadvantages of each method, including the respectively required sample preparation, the results for four polymer-modified cement pastes, varying in polymer content and cement fineness, were evaluated.

To some extent, significant discrepancies in the adsorption degrees were observed. There is a tendency that significantly lower amounts of adsorbed polymers were identified using TG-MS compared to values determined with the depletion method. Spectrophotometrically generated values were ​​lying in between these extremes. This tendency was found for three of the four cement pastes examined and is originated in sample preparation and methodical limitations.

The main influencing factor is the falsification of the polymer concentration in the liquid phase during centrifugation. Interactions in the interface between sediment and supernatant are the cause. The newly developed method, using TG–MS for the quantification of SA particles, proved to be suitable for dealing with these revealed issues. Here, instead of the fluid phase, the sediment is examined with regard to the polymer content, on which the influence of centrifugation is considerably lower.
KW  - Zement
KW  - Polymere
KW  - polymer adsorption
KW  - cement
KW  - visible spectrophotometry
KW  - depletion method
KW  - mass spectrometry
Y1  - 2020
UR  - https://e-pub.uni-weimar.de/opus4/frontdoor/index/index/docId/4472
UR  - https://nbn-resolving.org/urn:nbn:de:gbv:wim2-20210804-44729
UR  - https://link.springer.com/article/10.1007/s42452-020-03825-5
VL  - 2020
IS  - Volume 2, article 2061
SP  - 1
EP  - 11
PB  - Springer
CY  - Heidelberg
ER  -