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Deng D.,Central South University | Liu Z.,Central South University | de Schutter G.,Ghent University | Liu Y.,Chenzhou Bureau of Quality and Safety Supervision for Construction Engineering
Kuei Suan Jen Hsueh Pao/Journal of the Chinese Ceramic Society | Year: 2012

Physical sulfate attack on concrete has received more attentions. Due to the similar behavior between concrete and other porous materials, "sulfate salt weathering" becomes a degradation mechanism for deteriorated concrete close to the earth face. However, this aspect is not well understood. In this paper, some disputations were summarized and discussed based on the extensive review of long-term field and lab-scale studies on "sulfate salt weathering on concrete". Consistent with disputed remarks, some issues that need to be further investigated were described in detail. This paper also provided a framework for considering the complexity of "sulfate salt weathering on concrete" and suggested a systematic future research for the scientific conclusions.


Liu Z.,Central South University | Deng D.,Ghent University | de Schutter G.,Ghent University | Liu Y.,Chenzhou Bureau of Quality and Safety Supervision for Construction Engineering
Kuei Suan Jen Hsueh Pao/Journal of the Chinese Ceramic Society | Year: 2012

The deterioration behavior of concrete specimens partially exposed to Na 2SO 4 and MgSO 4 solutions was analyzed by using environmental scanning electron microscopy, energy dispersive spectrometer and X-ray diffraction as well. The effect of concrete carbonation on the "sulfate salt weathering on concrete" was investigated. The results show that the ettringite and gypsum crystals formed in the interfacial transition zone cause the concrete damage. Na 2SO 4 crystals could be identified in the carbonate concrete.


Liu Z.,Central South University | Deng D.,Central South University | de Schutter G.,Ghent University | Liu Y.,Chenzhou Bureau of Quality and Safety Supervision for Construction Engineering
Kuei Suan Jen Hsueh Pao/Journal of the Chinese Ceramic Society | Year: 2012

In order to verify whether salt sulfate weathering is a mechanism causing porous materials damage, the trace of sulfate crystal can be identified by means of environmental scanning electron microscopy, scanning electron microscopy, energy dispersive spectrometer and X-ray diffraction as well. In this paper, the effect of Na 2SO 4 solution on the partially exposed cement paste and fly ash cement paste was investigated. The results showed that the crystals of Na 2SO 4 did not appear under the constant exposure or fluctuated exposure condition, however, there exsit a great amount of ettringite and gypsum as the corrosion products of chemical sulfate attack. It is indicated that the chemical sulfate attack is likely still the degradation mechanism for the paste deterioration.

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