IMECH-IR  > 力学所知识产出(1956-2008)
Expansion behavior of portland cement mortars under sulfate attack
Chen JK; Jiang MQ(蒋敏强); Yang DY
Source PublicationKey Engineering Materials
Conference NameAsian Pacific Conference for Fracture and Strength (APCFS'06)
Conference DateNovember 22, 2006 - November 25, 2006
Conference PlaceSanya, Hainan Island, China
AbstractThe expansion behaviors are studied on mortars at water-cement ratio (w/c)=0.4, 0.6, and 0.8, stored in sodium sulfate solutions with sulfate concentration of 0 ppm, 20,250 ppm, and 54,000 ppm, respectively. The mortars stored in control solution show no expansion, whereas the expansion of the ones exposed to sodium sulfate solutions occurs in two stages (i.e., "dormant" and "speedup" Stages). The high concentration of sulfate accelerates the expansion, but control of water-cement ratio (0.60 in this case) can put up higher resistance to sulfate attack. The XRD analysis shown that the macro-expansion depends on the formation and growth of both ettringite and gypsum. The analysis obtained by means of Sigmoidal Fit Method indicates that the microdamage evolution depends strongly on the average size of microvoids in the material.
KeywordEttringite Mortars Sodium Sulfate Attack
WOS IDWOS:000252246301267
Indexed ByCPCI-S ; EI
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Document Type会议论文
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GB/T 7714
Chen JK,Jiang MQ,Yang DY. Expansion behavior of portland cement mortars under sulfate attack[C]Key Engineering Materials,2007.
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