Key Factors That Influence the Performance Properties of Arp/Mcu Saltstone Mixes

Harbour, John R.; Edwards, T. B.; Williams, Vickie

doi:10.2172/969291

Cited by 6 publications

(10 citation statements)

References 3 publications

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“…Also, the rate of the hydration for the lower aluminate SWPF mix was slower over the initial few days than the rate for the SWPF mix with higher aluminate. The measurements of heats of hydration at 50 °C were also performed using ARP/MCU mixes [10]. The heat of hydration results obtained for ARP/MCU mixes batched with 0.05 M (GVS107) and 0.22 M aluminate (GVS110) at different measurement t emperatures were consistent with the responses observed for the SWPF mixes at two levels of aluminate.…”

Section: Heat Of Hydration At Elevated Temperaturesupporting

confidence: 71%

“…Previous results at 25 °C show that the degree of hydration of Saltstone mixes containing aluminate concentrations roughly less than 0.2 M, do not reach the expected values if the premix components hydrate independently [9,10]. These previous results also show at 25 °C that the expected value of hydration is realized for aluminate concentrations greater than roughly 0.2 M. Therefore, aluminate at high enough levels in the salt solution can facilitate hydration and improve performance.…”

Section: Srnl-sti-mentioning

confidence: 87%

“…A second example is a mix batched using an ARP/MCU simulant containing 0.05 M aluminate with a measured heat of hydration of 140 J/g compared to a predicted value of 210 J/g [10]. Therefore, the degree of hydration for this ARP/MCU mix was 67%.…”

Section: Degree Of Hydrationmentioning

confidence: 99%

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Performance Properties of Saltstone Produced Using SWPF Simulants

Harbour¹,

Edwards²

2010

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Section: Heat Of Hydration At Elevated Temperaturesupporting

confidence: 71%

Section: Srnl-sti-mentioning

confidence: 87%

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Performance Properties of Saltstone Produced Using SWPF Simulants

Harbour¹,

Edwards²

2010

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“…The three day set time is typical for waste streams containing higher aluminate levels. 36 The yield stress and consistency are lower for the higher aluminate mixes as previously determined. The value of the dynamic Young's modulus (E) provides evidence on the strength and elasticity of the cured grout waste forms and on the performance properties in general.…”

Section: Saltstone Formulationsupporting

confidence: 59%

Solidification of the Hanford Law Waste Stream Produced as a Result of Near-Tank Continuous Sludge Leaching and Sodium Hydroxide Recovery

Reigel¹,

Johnson²,

Crawford³

et al. 2011

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“…Several studies on the impact of increasing the dissolved aluminum (generally aluminate AlO 2 -) in the liquid waste have been performed at SRNL (Harbour and Edwards 2009;Harbour et al 2007bHarbour et al , 2007cHarbour et al , 2008Harbour et al , 2009aHarbour et al , 2009bHarbour et al , 2009c. The results of these studies are discussed in Section 5.1.…”

Section: Identification Of Waste Constituents That Adversely Impact Wmentioning

confidence: 99%

Data Package for Secondary Waste Form Down-Selection—Cast Stone

Serne¹,

Westsik²

2011

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Executive SummaryThe objective of the data packages being generated for four potential waste forms for solidification/ stabilization of Hanford liquid secondary waste streams is to identify, evaluate, and summarize the existing information. This Cast Stone data package includes information available in the open literature and from data obtained from testing currently underway at Pacific Northwest National Laboratory (PNNL). As used at Hanford, the term Cast Stone describes a "grout"-based waste form made predominantly with fly ash and blast furnace slag (BFS) with lesser amounts of Portland cement as the starting dry blend. At Savannah River, this waste form is called Saltstone. The blend of grout reagents in Saltstone has been constant (45 weight percent [wt%] Grade 100 slag cement, 45 wt% Class F fly ash, and 10-wt% Type I/II Portland cement) since the Saltstone Disposal Facility began production in the early 1990s. At Hanford, some cementitious variants to Cast Stone have also been investigated, in which either the fly ash or the BFS is absent or replaced with another material. In this data package, these Cast Stone variants are included for completeness in the review. However, almost all the current Cast Stone waste form testing performed at PNNL uses a dry blend consisting of 47-wt% blast furnace slag (Grade 100), 45-wt% fly ash (Class F), and 8-wt% Portland cement (Type I/II). The sources of the three dry blend ingredients used at Hanford and Savannah River differ and may have subtle impacts on the physical and chemical attributes of the subsequent waste forms. The compositions of the secondary waste simulants used for the PNNL Cast Stone studies also differ from the simulants and actual wastes solidified at Savannah River; although both are caustic-, saline-and sodium-dominated solutions. The Hanford secondary waste simulants anion composition contains much less nitrate/nitrite than the waste streams solidified at Savannah River.Available literature on Cast Stone and Saltstone was reviewed with an emphasis on determining how Cast Stone and related grout waste forms performed in relationship to various criteria that will be used to decide whether a specific type of waste form meets acceptance criteria for disposal in the Integrated Disposal Facility (IDF) at Hanford. The draft waste acceptance criteria include the following requirements or targets:• acceptable leachate concentrations (less than the Universal Treatment Standards in 40 CFR 268) for Resource Conservation and Recovery Act (RCRA) metals using the Toxicity Characteristic Leach Procedure (TCLP) leach test• low bleed water criteria (i.e., no bleed water is tolerated after 28 days of curing)• low leachability index (LI) values for sodium (LI>6), technetium-99 (target LI>9) and iodine-129 (target LI>11)• minimum compressive strength of 500 psi (3.45 MPa).Other attributes of the Cast Stone process were compared with additional criteria, such as:• worker and public safety concerns• cost effectiveness versus other candidate waste forms in regard to ...

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Key Factors That Influence the Performance Properties of Arp/Mcu Saltstone Mixes

Cited by 6 publications

References 3 publications

Performance Properties of Saltstone Produced Using SWPF Simulants

Performance Properties of Saltstone Produced Using SWPF Simulants

Solidification of the Hanford Law Waste Stream Produced as a Result of Near-Tank Continuous Sludge Leaching and Sodium Hydroxide Recovery

Data Package for Secondary Waste Form Down-Selection—Cast Stone

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