Gamma irradiation resistance of an early age slag-blended cement matrix for nuclear waste encapsulation

Abstract Nano calcium silicate hydrate (nano-C–S–H) has become a novel additive for advanced cement-based materials. In this paper, the effect of nano-C–S–H on the early-age performance of cement paste has been studied, and some micro-characterization methods were used to measure the microstructure of nano-C–S–H-modified cement-based material. The results showed that the initial fluidity of cement paste was improved after addition of nano-C–S–H, but the fluidity gradual loss increased with the dosage of nano-C–S–H. The autogenous shrinkage of cement paste can be reduced by up to 42% maximum at an appropriate addition of nano-C–S–H. The mechanical property of cement paste was enhanced noticeably after adding nano-C–S–H, namely, the compressive strengths were improved by 52% and 47.74% at age of 1 day and 7 days, respectively. More hydration products were observed and pore diameter of cement matrix was refined after adding nano-C–S–H, indicating that the early hydration process of cement was accelerated by nano-C–S–H. This was mainly attributed to seed effect of nano-C–S–H. The detailed relationship between microstructure and early-age performance was also discussed.

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Features of the hydration process of the modified blended cement for fiber cement panels

MATEC Web of Conferences ◽

10.1051/matecconf/201817003030 ◽

2018 ◽

Vol 170 ◽

pp. 03030 ◽

Cited By ~ 3

Author(s):

Rustem Mukhametrakhimov ◽

Liliya Lukmanova

Keyword(s):

Electron Microscopy ◽

Mechanical Properties ◽

Blended Cement ◽

Physical And Mechanical Properties ◽

Hydration Process ◽

Cement Matrix ◽

X Ray Diffraction ◽

Structure Form ◽

Silicate Phase ◽

X Ray

The paper studies features of the hydration process of the modified blended cement for fiber cement panels (FCP) using differential thermal analysis, X-ray diffraction analysis, electron microscopy and infrared spectroscopy. It is found that deeper hydration process in silicate phase, denser and finer crystalline structure form in fiber cement matrix based on the modified blended cement. Generalization of this result to the case of fiber cement panels makes it possible to achieve formation of a denser and homogeneous structure with increased physical and mechanical properties.

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Influence of Gamma Irradiation on Leaching of Simulated Nuclear Waste Glass: Temperature and Dose Rate Dependence in Deaerated Water

Journal of the American Ceramic Society ◽

10.1111/j.1151-2916.1983.tb11002.x ◽

1983 ◽

Vol 66 (12) ◽

pp. 863-867 ◽

Cited By ~ 16

Author(s):

L. R. PEDERSON ◽

G. L. McVAY

Keyword(s):

Gamma Irradiation ◽

Dose Rate ◽

Nuclear Waste ◽

Waste Glass ◽

Rate Dependence ◽

Glass Temperature ◽

Nuclear Waste Glass

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Early-age behavior of materials with a cement matrix

Cement and Concrete Research ◽

10.1016/j.cemconres.2010.03.006 ◽

2010 ◽

Vol 40 (7) ◽

pp. 997-1008 ◽

Cited By ~ 4

Author(s):

J.F. Georgin ◽

T. Le Bihan ◽

J. Ambroise ◽

J. Pera

Keyword(s):

Cement Matrix ◽

Early Age

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Sorption of some radionuclides from nuclear waste effluents by polyaniline/SiO2 composite: Characterization, thermal stability, and gamma irradiation studies

Applied Radiation and Isotopes ◽

10.1016/j.apradiso.2019.109009 ◽

2020 ◽

Vol 156 ◽

pp. 109009 ◽

Cited By ~ 1

Author(s):

E.A. Abdel-Galil ◽

A.S. Tourky ◽

A.E. Kasem

Keyword(s):

Thermal Stability ◽

Gamma Irradiation ◽

Nuclear Waste ◽

Waste Effluents

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CONTINUOUS MICROSTRUCTURAL CORRELATION OF SLAG/SUPERPLASTICIZER CEMENT PASTES BY HEAT AND IMPEDANCE METHODS VIA FRACTAL ANALYSIS

Fractals ◽

10.1142/s0218348x17400035 ◽

2017 ◽

Vol 25 (04) ◽

pp. 1740003 ◽

Cited By ~ 10

Author(s):

S. W. TANG ◽

R. J. CAI ◽

Z. HE ◽

X. H. CAI ◽

H. Y. SHAO ◽

...

Keyword(s):

Compressive Strength ◽

Fractal Analysis ◽

Setting Time ◽

Blended Cement ◽

Impedance Measurement ◽

Heat Evolution ◽

Early Age ◽

Contact Impedance ◽

Cement Pastes ◽

Early Age Hydration

This paper presents a preliminary work to evaluate the influence of slag and superplasticizer on the early-age hydration of cement pastes by an innovative non-contact impedance measurement, heat evolution method, compressive strength and setting time tests. Besides, the cumulative pore volume obtained from modulus and phase of impedance in different hydration sections is taken to continuously correlate the cumulative heat releasing of cement pastes via the fractal analysis. Retarded phenomena and mechanism of hydration in cement pastes incorporated with slag and superplasticizer are studied, respectively. It is found that the compressive strength and setting time have a good linear relation with the slag amount in blended cement pastes.

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