The influence of the water desorption kinetics from superabsorbent polymers on the compressive strength of cement composites

openaccess, Vol. 563 (7) 2019 / wtorek, 23 lipca, 2019

(Open Access)

M. Kalinowski,
P. Woyciechowski

DOI: 10.15199/33.2019.07.07

Volume 563: Issue 7
Pages 47 – 51
Accepted for publication: 16.04.2019 r.

One of the recently introduced groups of additions to the concrete technology is group of superabsorbent polymers (SAP). Their use, as a means of internal water curing agent, allows for a significant reduction of linear changes caused by shrinkage deformations, thus improving composites durability.The influence of SAP on the mechanical parameters, such as compressive strength, is not as clearly defined. As part of a research program, ten compositions of concrete mixtures modified with two types of superabsorbent polymers were tested. The tested mixtures also differed in the SAP dosing methodology, i.e. the desorption kinetics of the additive used. The aim of the study was to determine the effects of variables, such as differences in the SAP dosing method, SAP’s absorption potential and its absorption and desorption mechanics on the formation of selected properties of concrete – compressive strength and consistency of the concrete mix. Based on the obtained results, it was found that the SAP desorption kinetics in the concrete mix and the differences in properties of the tested superabsorbent polymers have a significant influence on the course of changes on the tested concrete properties.
Keywords: concrete composites; superabsorbent polymers; absorption; desorption; compressive strength.
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mgr inż. Maciej Kalinowski, Politechnika Warszawska; Wydział Inżynierii Lądowej
ORCID: 0000-0002-6729-1506

prof. nzw. dr hab. inż. Piotr Woyciechowski, Politechnika Warszawska; Wydział Inżynierii Lądowej
ORCID: 0000-0002-8127-7559

mgr inż. Maciej Kalinowski, Politechnika Warszawska; Wydział Inżynierii Lądowej