Rheologic properties of fresh cement mixes for repository sealing applications: effects of superplasticizers, mixing procedures, and time

Technical Report · Wed Sep 01 00:00:00 EDT 1982

OSTI ID:6919877

Roy, D M; Asaga, K

As part of the design of optimally durable, hardened cementitious plugging materials for repository borheole plugging, shaft and tunnel sealing, detailed studies of rheological properties have been made. The effects of mixing procedures upon measured rheological properties of fresh cement mixes with and without superplasticizing admixtures condensates of sulfonated naphthalene- and melamine-formaldehyde have been investigated. Coaxial cylindrical viscometer measurements were made, recording shear stress-shear rate relationships and defining yield stress and plastic viscosity. In the absence of admixture, yield stress and plastic viscosity decreased substantially with increasing intensity of mixing, which caused a breakdown of particulate aggregates. However, with admixture present, the rheological properties of already well-dispersed mixes did not change significantly with increasingly intense mixing. The changes of the viscometric functions with time were investigated, and were related to admixture type and concentration, cement type, and volume concentration of cement. The mechanisms of action of the superplasticizers and their use in generating reliable workable low water/cement ratio mixes are discussed. 36 figures, 3 tables.

• Research Organization: Pennsylvania State Univ., University Park (USA). Materials Research Lab.
• DOE Contract Number: AC06-76RL01830
• OSTI ID: 6919877
• Report Number(s): ONWI-199; ON: DE83000732; TRN: 82-023460
• Resource Relation: Other Information: Portions of document are illegible
• Country of Publication: United States
• Language: English

Related Subjects

12 MANAGEMENT OF RADIOACTIVE AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES
CEMENTS
RHEOLOGY
RADIOACTIVE WASTE STORAGE
SEALING MATERIALS
CLOSURES
EXPERIMENTAL DATA
MIXING
MIXTURES
PLASTICIZERS
UNDERGROUND STORAGE
VISCOSITY
BUILDING MATERIALS
DATA
DISPERSIONS
INFORMATION
MANAGEMENT
MATERIALS
NUMERICAL DATA
STORAGE
WASTE MANAGEMENT
WASTE STORAGE
052002* - Nuclear Fuels- Waste Disposal & Storage