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Figure 4: Mass loss of mortars as a function of thermal cycles
Figure 5: Mass loss rate of mortars as a function of thermal cycles
It can be seen that suggested exposure conditions combined with mass loss measurements are
valuable methods for testing the resistance of cementitious materials to PSA. This method
demonstrated good sensitivity that enabled precise capture of the differences in rate of
deterioration due to PSA in mortar mixes with a wide range of w/b ratios and two different
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International RILEM Conference on Materials, Systems and Structures in Civil Engineering
Conference segment on Service Life of Cement-Based Materials and Structures
22-24 August 2016, Technical University of Denmark, Lyngby, Denmark
SCMs. The results of such testing method can be used for comparison of different mixture
designs for a construction project. In order to use the results of this type of test method for
service life prediction, the performance of suggested concrete mixture can be compared to the
performance of a mixture with known performance from field testing.However, it is
impossible to mimic all possible real live scenarios of aggressive environmental conditions
either by laboratory or by field testing. The best approach is to obtain basic properties using
laboratory testing and use them for service life predictions by means of modeling. Further
research is needed to extend this testing method to concretes.
4. Conclusions
Based on the presented experimental results the following conclusions can be made:
The combination of the selected sample size and thermal cycling in 30% sodium sulfate
solution produced exposure conditions suitable for testing of the resistance to physical
sulfate salt attack for a wide range of mortar mixture designs.
Mass loss was the most efficient and sensitive method for the evaluation of the extent of
damage and rate of deterioration during exposure to physical sulfate salt attack.
Further research is needed to extend the suggested testing method to concretes.
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