Solidification of ion exchange resins saturated with Na+ ions: Comparison of matrices based on Portland and blast furnace slag cement

Abstract

Ion exchange resins (IERs) are widely used by the nuclear industry to decontaminate radioactive effluents. After use, they are usually stabilized and solidified by encapsulation in cementitious materials. However, for certain combinations of cement and resins, the solidified waste forms can exhibit strong expansion, possibly leading to cracking of the matrix. In this work, the behaviour of cationic resins in the Na + form is investigated in Portland cement (CEM I) or blast furnace slag cement (CEM III/C) pastes at early age in order to have a better understanding of the swelling process. The results show that during the hydration of the CEM I paste, the resins exhibit a transient expansion of small magnitude due to the decrease in the osmotic pressure of the pore solution. This expansion, also observed with C 3 S pastes containing similar IERs, occurs just after setting and is sufficient to damage the material which is poorly consolidated. In the CEM III/C paste, expansion of the resins occurs before the end of setting and only induces limited stress in the matrix which is still plastic.

Chloride Ion Adsorption Capacity of Anion Exchange Resin in Cement Mortar

“…Ion exchange resin is widely used for the removal of harmful ions in the water treatment field and in the production of ultrapure water for semiconductor and liquid crystal display (LCD) cleaning [ 16 , 17 ]. In the field of construction materials, the solidification treatment of ion exchange resins for the recovery of radioactive materials and heavy metals has been mostly studied [ 18 , 19 , 20 ]. Only a few studies have been conducted on the effects of ion exchange resin on cement-based composite materials.…”

Comparative Environmental Assessment of Rigid, Flexible, and Perpetual Pavements: A Case Study of Texas

“…Some of the SCMs are blast furnace slag [106,107], coal bottom ash [108,109], and coal fly ash [110,111]. Blast furnace slag is a fine powder obtained from iron slag grinding that remains after casting a blast furnace into water or steam [112,113]. Coal bottom ash is a non-combustible residue that remains at the bottom of boilers, furnaces, or incinerators after industrial combustion [114,115].…”