Abstract
The aim of experiments is to propose a cement compound with a slow development of hydration heat. The cement paste will be prepared from a radioactive waste (RAW) and will be loaded into a container. The container with a fixed RAW will be stored for long disposal in a surface repository Mochovce.
During the first stage, it was carried out non-radioactive experiments with the concentrate simulate and the sludge simulate. In the laboratory scale it was tested an application of slag-portland cement, sand, slag, power plant’s fly ash, calcium hydrate and plastificator additives. A laboratory set has been set up to monitor the temperature increase in the hardening products. It was monitored flows properties of fresh cement pastes and compression strength after 28 days curing.
The 200 dm3 drums as well as a full-scale model experiment at cementation unit in Bohunice Waste Treatment Centre (BWTC) were used in order to verify the results of non-radioactive laboratory experiments.
The experiments with original concentrate and sludge were performed in the laboratory scale and a 200 dm3 drum. The parameters of products monitored during non-radioactive tests were extended by 137Cs leachability index.