Abstract
This paper isfocused on the use of Supersulfated Cement (SSC) in mass concrete. The physicalproperties and mechanicalproperty was tested. Contrast with the common cement, this paper studied the temperature rise of hydration and the heat of hydration to obtain the advantage of SSC, which will provide the basis for the use of SSC in mass concrete.The micro properties were tested through Scanning Electron Microscope (SEM). The test shows that the SSC shows better workingperformance than ordinary cement. The compressive strength of SSC under standard curing condition is higher than that under room curing condition. The compressive strength of SSC is increasing with time and the rate of increasing is decreasing. The temperature rise of hydration of SSC are lower than that of ordinary cement. Different with the ordinary cement, the main hydrated products of SSC areettringite and scalycalcium silicate hydrate.
Highlights
Supersulfated Cement (SCC) which is mainly produced by granulated blast furnace slag and using gypsum as sulfate exciting agent and clinker or lime as alkaline exciting agent is a kind of clinker-free cement, which is been called as slag-gypsum cement andslag sulphated cement.The components proportion of SSC usually is 75% ~ 75% slag, 10% ~ 20% of sulfate class and 1% ~ 5% content of alkaline elements
Contrary to the ordinary cement, SSC has the advantage of lower heat of hydration[1], control thealkali aggregate reaction (AAR) because of the higher content of granulated blast furnace slag that is useful to restrain AAR[2,3]and good sulfate resistance
As the application of SSC prevalent in European countries, the worldwide interest in the understanding and research of SSCis more and more strong.At present the sulfate cement has very good sales market, which has been applied into multiple fields, such as sewage treatment plant, pool, water concrete, industrial workshop floor mass concrete, concrete pile and other aspects.Resently the main research of SSC is focused on the use of industrial waste residue in SSC, the physical mechanics performance of SSC, which showed that SSC has Project number: CSCEC-2014-Z-3451302195
Summary
Supersulfated Cement (SCC) which is mainly produced by granulated blast furnace slag and using gypsum as sulfate exciting agent and clinker or lime as alkaline exciting agent is a kind of clinker-free cement, which is been called as slag-gypsum cement andslag sulphated cement.The components proportion of SSC usually is 75% ~ 75% slag, 10% ~ 20% of sulfate class (such as dihydrate gypsum and anhydrite, etc.) and 1% ~ 5% content of alkaline elements (such as clinker, calcium hydroxide, etc.). Contrary to the ordinary cement, SSC has the advantage of lower heat of hydration[1], control thealkali aggregate reaction (AAR) because of the higher content of granulated blast furnace slag that is useful to restrain AAR[2,3]and good sulfate resistance. This study focused on using SSC in mass concrete.First by studying its physical properties, mechanical properties, this paper studied the feasibility of its application in the concrete.As the big volume and the lower surface thermal conductance of concrete, thereactionrate is very fast and main hydration process focuses in shorter time, which caused the rapid increasing of internal temperature and the largedifference between inside and outside temperatures. Compared with the ordinary Portland cement, this paper studied the temperature rise of hydration and the heat of hydration of SSC and analysis the advantages of SSC, which will provides abasis for its further use in mass contrete. Themiro properties of SSC is investigated to analysis its hydration products and reveals the hydrationmechanism
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