| Abstrak/Abstract |
Cementation is one method to immobilize radioactive waste in order to protect the environment from radionuclide release. Rice husk ash has been success used as pozzolanic materials for several years. The aim of this research is to understand the ability of rice husk ash pozzolan on strontium waste cementation process. This research was conducted by mixing strontium waste with sand, Portland cement and several composition of rice husk ash. The cement blocks were tested to determine their compressive strength by Universal Wood Testing after cured for 28 days. Strontium leaching rate encapsulated on the blocks was analyzed by Hitachi Zeeman 8000 Atomic Absorption Spectrophotometer for 21 days. This research showed that the compressive strength is affected by composition of rice husk ash and waste loaded into the blocks, but it is not affected by water cement ratio on the cement blocks. Addition of rice husk ash up to 10v/o increases the compressive strength of mortar, but the further addition is affected inversely. The decreasing of compressive strength is also caused by the increasing of sand and strontium. But, these values obtained in this research still meet IAEA standard. The ability of RHA to adsorb strontium leads to the fulfilling of IAEA leaching rate standard for cementation and hence rice husk ash could be used for strontium waste cementation. |
