“混凝土硫酸盐结晶破坏”微观分析(II)—混凝土.pdfVIP

40 5 HA 631 40 5 Vol. 40No. 5 2 0 1 2 5 JOURNAL OF THE CHINESE CERAMIC SOCIETY M a y 2 0 1 2 (II) 1 1 2 3 Geert De Schutter (1. 410075 2. Magnel Laboratory for Concrete Research, Department of Structural Engi- neering, Ghent University, Ghent 9052, Belgium 3. 423000) X O482.3 A 0454–5648(2012)05–0631–07 2012–04–23 10:40:35 /kcms/detail/11.2310.TQ1040.001.html Micro-Analysis of “Sulfate Salt Weathering Distress on Concrete”: II. Concrete 1 2 2 3 LIU Zanqun DENG Dehua Geert DE SCHUTTER LIU Yunhua (1. School of Civil Engineering and Architecture, Central South University, Changsha 410075, China; 2. Magnel Laboratory for Concrete Research, Department of Structural Engineering, Ghent University, Ghent 9052, Belgium; 3. Chenzhou Bureau of Quality and Safety Supervision for Construction Engineering, Chenzhou 423000, Hunan, China) Abstract: The deterioration behavior of concrete specimens partially exposed to Na SO and MgSO solutions was analyzed by 2 4 4 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 gyp- sum crystals formed in the interfacial transition zone cause the concrete damage. Na SO crystals could be identified in the carbonate 2 4 concrete. Key words: sulfate attack; salt weathering; micro-analysis; concrete