Hostname: page-component-78c5997874-ndw9j Total loading time: 0 Render date: 2024-11-01T21:15:07.032Z Has data issue: false hasContentIssue false
  • English
  • Français

Rheological and Physical Properties of Magesium Oxide and Silica Fume-Modified Cement Mortars Cured at High Temperature

Published online by Cambridge University Press:  21 February 2011

Zenbe-e Nakagawa ,
Elizabeth L. White  and
Della M. Roy
Zenbe-e Nakagawa
Affiliation:
Materials Research Laboratory, The Pennsylvania State University, University Park, PA 16802
Elizabeth L. White
Affiliation:
Materials Research Laboratory, The Pennsylvania State University, University Park, PA 16802
Della M. Roy
Affiliation:
Materials Research Laboratory, The Pennsylvania State University, University Park, PA 16802
Get access

Abstract

Physical properties and placement characteristics of cementitious mortars have been studied for their potential as repository sealing materials. They contained various expansive agents and industrial by-products, and were investigated at curing temperatures up to 250° C, the upper limit of an emplacement site or generally of relevance in accelerated reaction studies. An expansive agent, magnesium oxide, and two industrial by-products, silica fume and granulated blast furnace slag have been used at different percentages in the mixtures. Excellent general performance, including very high strengths up to 240 MPa combined with very low intrinsic permeability <10−8 Darcy (μm2) were generated at 175°C on material having a viscosity of 5000 cP (mPa·s) at 38° C. One 1700 cP(mPa·s) material treated at 250°C had compressive strength >180 MPa and also <10−8 Darcy (μm2) permeability. MgO was found to accelerate formation of tobermorite and generally cause expansion; at 250° C expansion was also related to xonotlite formation.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 15: Symposium D – Scientific Basis for Nuclear Waste Management VI , 1982 , 97
Copyright
Copyright © Materials Research Society 1983

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

1) Roy, D.M. and Burns, F.L., Recent Advances in Repository Seal Materials, Proc. 5th Intl. Symp. on Scientific Basis for Radioactive Waste Management, Berlin, (in press, North Holland).Google Scholar
2) White, E.L., Scheetz, B.E., Roy, D.M., Zimmerman, K.G., Grutzeck, M.W., Permeability measurements on cementitious materials for nuclear waste isolation, pp. 471–478 in Scientific Basis for Nuclear Waste Management, Vol. 1, Proceedings of the Symposium on ‘Science Underlying Radioactive Waste Management,’ Materials Research Society Annual Mtg., Boston, MA, November 28-December 1, 1978; Ed: McCarthy, G.J. (1979).Google Scholar
3) Roy, D.M., White, E.L., Langton, C.A., and Grutzeck, M.W., New High Temperature Cementing Materials for Geothermal Wells: Stability and Properties, Final Report Geothermal Materials. Brookhaven National Laboratory No. DE-AC02-76CH00016, 75 pp. (1980).Google Scholar
4) Roy, D.M. and Johnson, A.M., Investigations of Stabilities of Calcium Silicate Hydrates at Elevated Temperatures and Pressures, in Proceedings of Conference on Calcium Silicate Building Products, S.C.I. Special Publication, Soc. Chem. Industry, London, 114–121 (1967).Google Scholar
5) Roy, D.M., Scheetz, B.E., White, E.L., Daimon, M., Borehole Cement and Rock Properties Study. Part A. Borehole Plugging Cement Studies. Annual Progress Report Oct. 1977-Sept. 1978. Battelle/ONWI Subcontract No. E512-00500. ONWI-5, 119 pp. (1978).Google Scholar
6) Diamond, S., White, J.L., and Dolch, W.L., ‘Effects of Isomorphous Substitution in Hydrothermally Synthesized Tobermorite, Am. Min. 51, 388–402 (1966).Google Scholar
7) Makino, Y., Saito, M., and Yanagi, M., ‘Effects of Addition of Mg(OH) 2 to Lime and Quartz Mixtures in Autoclave Curing, Gypsum and Lime No. 128, 8–14 (1974).Google Scholar
8) Langton, C.A., White, E.L., Grutzeck, M.W., and Roy, D.M., High Temperature Cements with Geothermal Applications, 7th Intl. Congress Chem. Cement, Paris, 1980, Vol. III, Communications, V-145-V-151.Google Scholar