TOPICS

1/ Methods of production of cement-waste forms

Performance requirements and implementation methods
Formulation for various kinds of wastes (metallic wastes, ashes, spent sorbents including ion exchange resins and zeolites, coprecipitation sludges, evaporator concentrates and other saline solutions, organic-containing wastes)
Formulation methodologies
Processes involved: mixing device designs, packaging options ; engineering feasibility and implementation in real site

2/ Physico-chemical processes occurring in cement-waste forms at early age

Cement-waste interactions
Factors influencing rheology, setting, hardening, hydration rate, heat production, pH and pore solution evolution
Evolution of mineralogy and microstructure

3/ Emerging and alternative cementitious systems

4/ Influence of internal factors on long-term properties of cement-waste packages

Waste / cement / aggregate interactions
Differed ettringite formation
Effect of bg and a irradiation: radiolytic gas production, stability of cement hydrates and admixtures
Corrosion of metallic waste
Gas evacuation
Micro and macro-cracking
Chemo-mechanical modelling NEW !

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5/ Influence of external factors on long term properties of cement-waste packages and cement barriers

Leaching by aggressive solutions (chloride, sulfate…), carbonation
Effect of temperature
Redox state evolution
Radionuclides retention
Liquid, gas, and contaminant transport under unsaturated or saturated conditions
Interactions with other cement barriers
Modelling of long-term behavior - saturated versus unsaturated transport

6/ Monitoring of cemented waste packages and cement barriers NEW !

Monitoring techniques, remote monitoring, potential of robotics for monitoring condition of waste packages and waste forms
Methods for detecting and quantifying concrete contamination
Methodology for service life extrapolation
Methods for reworking non-compliant cement waste forms

NUWCEM 2021