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The comparison between sulfate salt weathering of portland cement paste and calcium sulfoaluminate cement paste
In this paper, the damage performances of sulfate salt weathering of Portland cement paste and calcium sulfoaluminate (CSA) cement paste were compared according to authors' previous studies. It was found that the evaporation zone of speciments partially immersed in 10% Na2SO4 solution were both severely deteriorated for Portland cement and CSA cement. However, the differences were more significant: (1) the CSA cement paste were damaged just after 7 days exposure compared to the 5 months exposure of Portland cement paste under the same exposure condition of RH 60% and 20°C; (2) the cement paste specimen was split into several pieces along the shrinkage cracks, and the damaged CSA cement paste consisted of a detachment of successive paste layers; (3) gypsum and ettringite were identified in the Portland cement paste and attributed to the paste failure mechanism, however sodium sulfate crystals were clearly observed in the detached paste layers. According to the comparison the so-called sulfate weathering of Portland cement concrete was discussed.
The comparison between sulfate salt weathering of portland cement paste and calcium sulfoaluminate cement paste
In this paper, the damage performances of sulfate salt weathering of Portland cement paste and calcium sulfoaluminate (CSA) cement paste were compared according to authors' previous studies. It was found that the evaporation zone of speciments partially immersed in 10% Na2SO4 solution were both severely deteriorated for Portland cement and CSA cement. However, the differences were more significant: (1) the CSA cement paste were damaged just after 7 days exposure compared to the 5 months exposure of Portland cement paste under the same exposure condition of RH 60% and 20°C; (2) the cement paste specimen was split into several pieces along the shrinkage cracks, and the damaged CSA cement paste consisted of a detachment of successive paste layers; (3) gypsum and ettringite were identified in the Portland cement paste and attributed to the paste failure mechanism, however sodium sulfate crystals were clearly observed in the detached paste layers. According to the comparison the so-called sulfate weathering of Portland cement concrete was discussed.
The comparison between sulfate salt weathering of portland cement paste and calcium sulfoaluminate cement paste
Liu, Zanqun (author) / Deng, Dehua (author) / De Schutter, Geert (author)
2015-01-01
International Conference on the Regeneration and Conservation of Concrete Structures, Proceedings
Conference paper
Electronic Resource
English
DDC:
710
Experimental study on Portland cement/calcium sulfoaluminate binder of paste filling
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