Stability of Calcium Chloroaluminate and Calcium Sulfoaluminate Phases in Hydraulic-Cement Mixtures

Poole, Toy S.

doi:10.21236/ada265057

Cited by 1 publication

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“…However, it is likely that the high chloride content will react preferentially with the aluminates in the cementitious materials to form calcium chloroaluminate, and calcium sulfoaluminate (ettringite), the . principal reaction product that occurs in sulfate attack, will not form (Poole, 1993). Calcium chloroaluminate is considered to be mildly expansive, but not nearly as expansive as ettringite.…”

Section: Analysis Of Variance Among Production Runs Time Of Settingmentioning

confidence: 99%

U.S. Army Engineer Waterways Experiment Station (WES) support to Department of Energy Rocky Flats Facility (DOE RF) saltcrete processing. Progress report, October 1--December 31, 1993

1994

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to the WES for technical and scientific support to waste cementation and saltcrete processing-operations. During this report period, tasks described in amendment MOO3 were initiated, some were completed, and an additional task (see 2b) not listed in MOO3 also was completed at the request of DOE RF. Summaries of task-specific activities are in four enclosures to this progress report. Other activities during this quarter included negotiation and initiation of amendment M004, to extend the period of performance and continue WES assistance to DOE RF. b. On November 7, 1994, the WES received a copy of a document prepared by.EG&G Rocky Flats numbered TD94-DDT-001 and entitled "Analyses of Saltcrete." Review of this EG&G document was undertaken by the WES team as described in RPP 95-2. Written review comments are attached (enclosure 2).c. During FY 94, the WES had reviewed another EG&G report, "Saltcrete Evaluation," dated August 16, 1993. During the current report period, the WES initiated and completed some statistical analyses of data tabulated in the earlier EG&G report and prepared a written review to include these data analyses. A copy of the written review with results of the data analyses is attached (enclosure 3).d. During the previous quarter, the WES had initiated scoping studies to confirm the formation of the crystalline phase darapskite from' surrogate (nonradioactive) RF waste salt when mixed with portland cement. As part of a new task under M003, the WES continued these studies to assess the effectiveness of darapskite deterioration of saltcrete, and explored the mechanism by which deleterious reactions occur in surrogate saltcrete. These scoping studies and results of cycles of freezing and thawing and other variables are described in enclosure 4. Work on calculation of forces that could plausibly be generated by the crystallization of nitrate-sulfate salts in saltcrete will continue through January 1995. 3. Obiective : Provide technical review and scientific and engineering technical assistance to ongoing waste cementation operations at the Rocky Flats Plant. This assistance will include consultation about laboratory activities at RFO, review of documents provided by RFO, review of data related to operational parameters and wasteform performance, and expert assistance in data analysis, troubleshooting, and process modification. a. Task 1. S u~~o r t for Saltcrete Petrographic Studv. Most of this task was completed during 3-44 FY 94. The.WES team provided oral and written guidance to personnel at RFO who were engaged in petrographic analysis of saltcrete samples, to determine causes of wasteform expansion. RFO contract personnel. were not specifically trained in preparing and examining concrete-like specimens and identifying compounds common to portland-cement based materials and salts likely to occur in saltcrete. The Background

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Section: Analysis Of Variance Among Production Runs Time Of Settingmentioning

confidence: 99%

U.S. Army Engineer Waterways Experiment Station (WES) support to Department of Energy Rocky Flats Facility (DOE RF) saltcrete processing. Progress report, October 1--December 31, 1993

1994

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show abstract

Stability of Calcium Chloroaluminate and Calcium Sulfoaluminate Phases in Hydraulic-Cement Mixtures

Cited by 1 publication

References 13 publications

U.S. Army Engineer Waterways Experiment Station (WES) support to Department of Energy Rocky Flats Facility (DOE RF) saltcrete processing. Progress report, October 1--December 31, 1993

U.S. Army Engineer Waterways Experiment Station (WES) support to Department of Energy Rocky Flats Facility (DOE RF) saltcrete processing. Progress report, October 1--December 31, 1993

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