Cement technology for borehole plugging: interim report on the effects of fly ash and salt on the physical properties of cementitious solids

Technical Report · Sat Mar 01 00:00:00 EST 1980

DOI:https://doi.org/10.2172/5479210· OSTI ID:5479210

Moore, J. G.; Morgan, M. T.; McDaniel, E. W.; Greene, H. B.; West, W. A.

Results of initial studies of a systematic investigation to determine the effects of fly ash and salt on the physical properties of pozzolanic concretes and saltcretes are reported. Addition of fly ash to mortars decreased the set time and bleed characteristics and increased the compressive strength and permeability, but it had very little effect on the density or the thermal conductivity of the solid. The magnitude of these effects was only slightly related to the lime content of the fly ash. In the case of saltcretes, low-lime fly ash slightly decreased the set time and the bleed characteristics of the wet mix. However, a high-lime fly ash doubled the set time and decreased the bleed characteristics to essentially zero. The compressive strength of saltcretes was increased by the addition of fly ash and was independent of the lime content. Such additions had little effect on the thermal conductivity or density. The thermal conductivities of cement pastes containing fly ash showed a near-linear relationship with the density of the resulting solids. In the case of mortars, the thermal conductivity decreased with increasing temperature and showed some hysteresis in the initial heating cycle. After the first cycle, the thermal conductivity decreased from about 1.32 W/m.K at 350/sup 0/K to 1.27 W/m.K at 475/sup 0/K.

• Research Organization: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
• DOE Contract Number: W-7405-ENG-26
• OSTI ID: 5479210
• Report Number(s): ORNL/TM-7106; TRN: 80-006419
• Country of Publication: United States
• Language: English

Related Subjects

12 MANAGEMENT OF RADIOACTIVE AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES
BOREHOLES
PLUGGING
CONCRETES
PHYSICAL PROPERTIES
RADIOACTIVE WASTE FACILITIES
CLOSURES
CEMENTS
COMPRESSION STRENGTH
CURING
DENSITY
FLY ASH
PERMEABILITY
RADIOACTIVE WASTE STORAGE
SALTS
THERMAL CONDUCTIVITY
UNDERGROUND STORAGE
AEROSOL WASTES
BUILDING MATERIALS
CAVITIES
MANAGEMENT
MATERIALS
MECHANICAL PROPERTIES
NUCLEAR FACILITIES
STORAGE
THERMODYNAMIC PROPERTIES
WASTE MANAGEMENT
WASTE STORAGE
WASTES
052002* - Nuclear Fuels- Waste Disposal & Storage