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SEM Investigation on3CaO·3A1_2O_3 . BaSO_4Paste Structure

Yan Peiyu Yang Wenyan Tsinghua University)(Wuhan University of Technology )  
The hydration of a new cementitious mineral 3CaO·3A1_2O_3·BaSO_4 have been investigated with SEM in the presence or in the absence of gypsum.Pure 3CaO.3A1_2O_3· BasO_4 hydrates quickly and has dense pastestructure.A high compressive strength is obtained. The hydration reaction of 3CaO . 3A1_2O_3 . BaSO_4 is hin-dered in the presence of gypsum. The paste porosity of 3CaO·3A1_2O_3.BasO_4 with gypsum is high and itsstrength is low. It is unsuitable for using Ba-bearing sulphoaluminate cement together with gypsum.
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