PREPARATION AND TESTING OF HYDRATED CEMENT SAMPLE FOR IMMOBILIZATION OF SIMULATED MEDIUM ACTIVE WASTE
In order to investigate the influence of water on cement glass repository system for isolation of Medium and Low Level Waste, a programme of cement characterization has been initiated. From the literature data, cement samples change the characteristics by the evolution of the hydration process with water. The water penetration in cement is influenced by the porosity of hydrated cement paste which in turn is governed by the initial water-to-cement (W/C) ratio. The water blended with clinker powder is responsible for the capillary and gel pores in the cement sample. The objective of this work is to compare the physical properties as density, specific pore volume measured by mercury intrusion porosimetry (MIP) and compressive strength on neat cement and cement containing chemical additives. For comparison purposes, the analyses have to be carried out on samples which have been prepared and aged on the same conditions. A method of preparation of cement sample and of samples of cement containing simulated radwaste is described. A simplified solution representing a MLW stream generated in a Fuel Reprocessing Facility (FRF) has been blended with clinker powder at W/C of 0.30-0.35 and 0.40 and solid to cement (S/C) ratios of 0.123 and 0.155. The results on cylindric samples of 2 cm O-slashed, 2 + 4 cm length and granules of 2.8 / 3.2 mm confirm the influence of the initial W/C ratio on the physical properties of cement prepared under constant manufacturing conditions. The influence of chemical additives at constant W/C ratio indicates an increase in the pore volume and a fragilization of samples measured by the decrease of the compressive strength.
Bibliographic Reference: EUROPEAN APPLIED RESEARCH REPORTS, NUCLEAR SCIENCE AND TECHNOLOGY SECTION, VOL. 5, NO. 4, PP 741-768, 1984. (EUR 9099 E)
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Record Number: 1989122063200 / Last updated on: 1987-01-01
Available languages: en