The Performance of Various Pozzolanic Materials in Improving Quality of Strontium Liquid Waste Cementation

Putero, Susetyo Hario; Rosita, Widya; Santosa, Haryono Budi; Budiarto, Rachmawan

doi:10.1016/j.proenv.2013.02.087

Cited by 5 publications

(7 citation statements)

References 13 publications

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“…Cement with high C 2 S hydrates much more slowly leading to a denser ultimate structure [2], therefore to get a good strength, Portland pozzolanic cement needs much more curing time. According to Susetyo et al (2013), the compressive strength of Portland pozzolanic cement is affected by w/c [3]. The workability of cement on 0.3 w/c was very low that resulted in presence of macro porosity.…”

Section: The Compressive Strength Testmentioning

confidence: 99%

“…A smaller grain size will expand the contact surface and increase adsorb capacity, but in the other hand, exchangable Sr 2+ is also much greater than in sand one. Baryte rock has no adsorb capacity, but the addition of baryte could increase the density of block (2.07 g/cm 3 to 1.66 -1.69 g/cm 3 of sand and zeolite) and block the intrusion of NaCl.…”

Section: Performance Of Cement For Immobilizing Strontium Waste In Samentioning

confidence: 99%

“…One method of immobilization is cementation. 3 . To form pozzolanic cement, 15% -40% of pozzolanic materials are added into a Portland cement [3].…”

Section: Introductionmentioning

confidence: 99%

“…3 . To form pozzolanic cement, 15% -40% of pozzolanic materials are added into a Portland cement [3]. Reaction between pozzolanic materials and Ca(OH) 2 will reduce porosity.…”

Section: Introductionmentioning

confidence: 99%

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Performance of Cement for Immobilizing Strontium Waste in Saline Environment

Putero¹,

Rosita²

2013

MSA

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For solving the radioactive waste storage problem, there is an idea to store immobilized waste at deep sea. Solidifier material, such as cement should be resistance to saline environment for deep sea storage. So, this research objective is to study the performance of cementation method in immobilizing strontium waste in saline environment. Research was conducted by immobilizing strontium waste using Portland pozzolanic cement, white cement and composite Portland cement. Cement, 65 ppm Sr(NO 3 ) 2 , sand and water were mixed and cast. Strontium waste varied in 2 v/o, 4 v/o, 6 v/o and 8 v/o. After 28 days curing, the cement block's compressive strength and leaching rate on saline water were analyzed. Determination of compressive strength was done by using Universal Wood Testing. The density of blocks was measured by picnometer at 25˚C. Compressive strength test for Portland pozzolanic cement at various w/c was conducted to confirm the effect of w/c in increasing the strength. For testing strontium leaching rate in water containing 35 ppm NaCl, cement blocks have been immersed in saline water for 21 days. 25 ml samples were taken and analyzed by Atomic Absorption Spectrophotometer. Strontium leaching rate on block containing pH 9 of waste was compared to the previous research data of strontium leaching rate on water to know the effect of saline water. To adjust the pH, 1 M NaOH was added into the waste. Effects of various cement type and filler materials (sand, zeolite and baryte) on Portland pozzolanic cement were also compared. The results show that there were almost no effects of salt on immobilized strontium waste, except in pH 9 waste (0.00224 over to 0.000199 g/cm 2 ·days). Strontium leaching rates on all cemented waste still meet the IAEA's standard, so the safety of cemented strontium waste disposal at saline environment could be ensured.

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Section: The Compressive Strength Testmentioning

confidence: 99%

Section: Performance Of Cement For Immobilizing Strontium Waste In Samentioning

confidence: 99%

“…One method of immobilization is cementation. 3 . To form pozzolanic cement, 15% -40% of pozzolanic materials are added into a Portland cement [3].…”

Section: Introductionmentioning

confidence: 99%

“…3 . To form pozzolanic cement, 15% -40% of pozzolanic materials are added into a Portland cement [3]. Reaction between pozzolanic materials and Ca(OH) 2 will reduce porosity.…”

Section: Introductionmentioning

confidence: 99%

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Performance of Cement for Immobilizing Strontium Waste in Saline Environment

Putero¹,

Rosita²

2013

MSA

Self Cite

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“…These studies show that mechanical integrity and leaching properties are acceptable for long-term safety [6,7]. Many studies have been made on cement matrix for radioactive waste solidification [8][9][10][11] and Ordinary Portland Cement (OPC) was used with various pozzolanic materials as an additive for solidification in plant scale applications [12,13].…”

Section: Introductionmentioning

confidence: 99%

Immobilization of radioactive borate liquid waste using natural diatomite

Osmanlıoğlu

2016

Desalination and Water Treatment

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In this article, influence of diatomite as a natural adsorbent in immobilization of radioactive borate liquid waste in the cement-diatomite matrix was investigated. Cylindrical concrete mixtures were prepared with different amounts of diatomite additives at three different w/c values. Mechanical strength tests were carried out to determine the uniaxial compressive strength of the samples. A new dynamic column type leaching tests were applied to the solidified waste forms, and leach rates of 137 Cs and 60 Co were determined according to different diatomite additives. The experimental results indicated that the increasing of the diatomite additive amounts resulted high isolation performance of the solidified waste form. However, the results revealed that mechanical strength decreases with increasing borate diatomite amount. Results show that 9% amount of natural diatomite is effective as an admixture of the cementation process for achieving long-term stability of solidified borate waste. Optimum strength and leach values were determined as 11.5 MPa with leaching rates of 7.5 × 10 −4 and 3.2 × 10 −5 cm/d for 137 Cs and 60 Co, respectively.

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