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@PHDTHESIS{Haufe:855013,
author = {Haufe, Johannes},
othercontributors = {Vollpracht, Anya and Matschei, Thomas and Bier, Thomas A.},
title = {{D}evelopment of a performance test to determine the
sulfate resistance of concrete},
school = {Rheinisch-Westfälische Technische Hochschule Aachen},
type = {Dissertation},
address = {Aachen},
publisher = {RWTH Aachen University},
reportid = {RWTH-2022-09929},
pages = {1 Online-Ressource : Illustrationen, Diagramme},
year = {2022},
note = {Veröffentlicht auf dem Publikationsserver der RWTH Aachen
University; Dissertation, Rheinisch-Westfälische Technische
Hochschule Aachen, 2022, Kumulative Dissertation},
abstract = {The resistance of concrete against sulfate attack is often
investigated by laboratory test methods on mortar specimens
using expansion measurements. In rare cases, strength loss
is measured by flexural or tensile strength tests. The
objective of this work was the development of a new
performance test method that takes into account both the
chemical and physical resistance of a given concrete mix to
sulfate attack. Statistical design of experiments was used
to investigate the significance and accelerating effect of
various relevant parameters, such as binder type, storage
temperature, type and concentration of sulfate solution, and
concrete composition, on the residual tensile strength ft of
ASTM C307-03 briquet specimens. To evaluate the sulfate
resistance of different concretes, the tensile strength was
normalized, i.e., it was related to the tensile strength of
the same-aged, unstressed concrete. For this purpose, the
fib Model Code's maturity formula was adapted. It was
demonstrated that it can be used to predict the tensile
strength of an undamaged concrete ftm during the test period
with sufficient accuracy. As a result, a test procedure was
described, which is based on testing the relative tensile
strength and considers all relevant parameters. Tests on 23
concretes with different cements and cement-fly ash
combinations were used to establish threshold values for the
reliable evaluation of sulfate resistance. Accordingly, a
high sulfate resistance is given if the relative tensile
strength of the concrete does not fall below a value of 0.70
after 273 days of sulfate storage. Furthermore, two criteria
for test termination can be defined after 182 days of
storage. If the concretes exhibit a relative tensile
strength of > 0.85, then it can be assumed that the proposed
threshold value of ft/ftm ≥ 0.70 is met also after 273
days of storage, and thus a high sulfate resistance of the
concrete is given. If the concretes have a relative tensile
strength of ft/ftm < 0.70, then their sulfate resistance is
classified as low. In the modified SVA method commonly used
for approval tests in Germany, tests with moderate sulfate
concentration currently have to be carried out for two
years. The new method is able to evaluate the sulfate
resistance of concrete in a much shorter period of time
under realistic environmental conditions.},
cin = {311110},
ddc = {624},
cid = {$I:(DE-82)311110_20140620$},
typ = {PUB:(DE-HGF)11},
doi = {10.18154/RWTH-2022-09929},
url = {https://publications.rwth-aachen.de/record/855013},
}
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