Pore solution chemistry of simulated low level liquid waste incorporated cement grouts

Book · Thu Aug 01 00:00:00 EDT 1996

OSTI ID:264446

Sahu, S; Diamond, S ^[1]

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1. Purdue Univ., West Lafayette, IN (United States). School of Civil Engineering

Expressed pore solutions from simulated low level liquid waste cement grouts cured at room temperature, 50 C and 90 C for various duration were analyzed by standard chemical methods and ion chromatography. The solid portions of the grouts were formulated with portland cement, fly ash, slag, and attapulgite clay in the ratios of 3:3:3:1. Two different solutions simulating off-gas condensates expected from vitrification of Hanford low level tank wastes were made. One is highly alkaline and contains the species Na{sup +}, PO{sub 4}{sup 3{minus}}, NO{sub 2}{sup {minus}}, NO{sub 3}{sup {minus}} and OH{sup {minus}}. The other is carbonated and contains the species Na{sup +}, PO{sub 4}{sup 3{minus}}, NO{sub 2}{sup {minus}}, NO{sub 3}{sup {minus}}, and CO{sub 3}{sup 2{minus}}. In both cases phosphate rapidly disappeared from the pore solution, leaving behind sodium in the form of hydroxide. The carbonates were also removed from the pore solution to form calcium carbonate and possibly calcium monocarboaluminate. These reactions resulted in the increase of hydroxide ion concentration in the early period. Subsequently there was a significant reduction OH{sup {minus}} and Na{sup +} ion concentrations. In contrast high concentration of NO{sub 2}{sup {minus}} and NO{sub 3}{sup {minus}} were retained in the pore solution indefinitely.

• OSTI ID: 264446
• Report Number(s): CONF-951155-; ISBN 1-55899-315-0; TRN: 96:016591
• Resource Relation: Conference: Fall meeting of the Materials Research Society (MRS), Boston, MA (United States), 27 Nov - 1 Dec 1995; Other Information: PBD: 1996; Related Information: Is Part Of Scientific basis for nuclear waste management 19; Murphy, W.M. [ed.] [Southwest Research Inst., San Antonio, TX (United States)]; Knecht, D.A. [ed.] [Lockheed Idaho Technologies Co., Idaho Falls, ID (United States)]; PB: 957 p.; Materials Research Society symposium proceedings, Volume 412
• Country of Publication: United States
• Language: English

Related Subjects

05 NUCLEAR FUELS
36 MATERIALS SCIENCE
LOW-LEVEL RADIOACTIVE WASTES
CEMENTING
LIQUID WASTES
WASTE FORMS
CORROSION
CONDENSATES
CORROSIVE EFFECTS
RADIOACTIVE WASTE PROCESSING
OFF-GAS SYSTEMS
VITRIFICATION
HANFORD RESERVATION
CHEMICAL COMPOSITION
EXPERIMENTAL DATA
PHOSPHATES
CARBONATES
HYDROXIDES
SODIUM COMPOUNDS
NITRITES
NITRATES
MATRIX MATERIALS
RADIOACTIVE WASTE DISPOSAL
SIMULATION