EFFECT OF GROUND BLAST FURNACE SLAG ON TSA RESISTANCE OF CEMENT-BASED MATERIAL
Thaumasite form of sulfate attack (TSA) is recognized to be detrimental todurability of cement-based material because its formation consumes the binder phase,C-S-Hgel. To discuss TSA prevention,effect of ground blast furnace slag on TSA resistance ofPortland cement-based material were investigated by means of mechanical property ofspecimens and erosion phases identification using micro-analytical techniques like fouriertransform infrared spectroscopy (FTIR),X-ray diffraction (XRD) ,scanning electronmicroscopy (SEM),and energy dispersive spectrum (EDS) as well as Raman spectra. Whenexposed to aggressive environment with 33800 ppm mass concentration of SO42-inmagnesium sulfate solution at low temperature (5℃±2℃ ) for 15 weeks,ratios ofcompressive strength loss decrease with increase of slag contents in binder. Furthermore,When thaumasite came into being in erosion phases of specimens with 0.15％ slag content,only ettringite and gypsum appeared in those with 30％,45％,60％ slag,which indicate thatdefinite amount of slag can restrain or retard formation of thaumasite and improve TSAresistance of Portland cement-based material sufficiently.
ground blast furnace slag cement-based material thaumasite
Fengchen ZHANG Baoguo MA Yuanyuan WU Geng YIN Yanchao ZHU
Key Laboratory for Silicate Materials Science and Engineering of Ministry of Education,Wuhan University of Technology,Wuhan,430070,PR China
国际会议
The International Conference on Durability of Concrete Structures(2008年混凝土结构耐久性国际学术会议)
杭州
英文
394-399
2008-11-01（万方平台首次上网日期，不代表论文的发表时间）