TY - RPRT TI - A thermodynamic model for blended cements AB - A chemical thermodynamic model has been developed for blended cements, called CEMCHEM. Given the chemical compositions of the blend materials, CEMCHEM calculates the equilibrium phase distribution, achieved at 25{sup o}C. It is based on a portion of the CaO-Al{sub 2}O{sub 3}- SiO{sub 2}- SO{sub 3}- H{sub 2}O system, whose phase relations have been determined from the results of `compatibility experiments`. Solubility models have been developed for the cement hydrate phases used in CEMCHEM, for use with the computer codes MINEQL, PHREEQE and EQ3/6. Validation of the overall approach is provided by the agreement between observed and calculated aqueous compositions for the compatibility experiments. Thus CEMCHEM, with the cement hydrate solubility models, can be used as the basis for modelling near field chemistry in cementitious radwaste repositories. (author). AU - "Atkins, M" AU - "Glasser, F" AU - "Kindness, A [Aberdeen Univ. (United Kingdom)]" AU - "Bennett, D" AU - "Dawes, A" AU - "Read, D [Atkins (W.S.) Engineering Sciences Ltd., Warrington (United Kingdom)]" KW - "12 MANAGEMENT OF RADIOACTIVE AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES" KW - "CEMENTS" KW - "PHASE STUDIES" KW - "RADIOACTIVE WASTE DISPOSAL" KW - "THERMODYNAMIC MODEL" KW - "COMPUTER CODES" KW - "LEACHING" KW - "SOLUBILITY" KW - "TEMPERATURE RANGE 0273-0400 K" KW - "052002" KW - "WASTE DISPOSAL AND STORAGE" DO - https://doi.org/ UR - PB - CY - United Kingdom PY - 1992 DA - 1993-12-31 LA - English J2 - [] VL - C1 - Department of the Environment, London (United Kingdom). Her Majesty`s Inspectorate of Pollution C2 - C3 - DOE-HMIP-RR-92.005 C4 - C5 - OSTI; NTIS (US Sales Only); INIS L3 - Other Information: PBD: 1992 ER -