“Evaluation of the Physico – Mechanical properties of cementation mortar with nanoadditives as a -ray shield"

Abstract

This dissertation deals with relatively low temperature synthesis and characterization of selected properties of copper tungstate nanocomposite powder synthesized by the co – precipitation technique in order to enhance the physical, mechanical, and radiation properties of the cementation mortar with nanoadditives. In the last decad requirements for radiation therapy was spreed and increased due to the positive results of it, so the number of radiation lab increased. Due to the importance for saving people whome work in this field and worker in these labs, it is important to made protection against penetration of gamma ray. Where lead is the more important material can be used in theradiation lab, and where it is expencive and notfrindely, so attention will be directed to the advanced of new materials like polymer materials, cement with natural material like illumonite or artificial material in the size of micro or nano materials like CuWO4 nanocomposite. This study interested with the partial replacement of cement used in mortat by CuWO4 nanocomposite for the protection of gamma ray penetration. In this research preparation of CuWO4 nanocomposite, and replace it by cement by different ratio (0.0%. 0.5% and 4.0%) and sand was carried out. Physical, mechanical and radiation tests were carried out on them. In this study general information about radiation, especially gamma ray, and the interaction between it and matter and its effect were discussed. The material which can be used for the protection from radiation like CuWO4 nanocomposite and its characteristic were investigated. In this study CuWO4 nanocomposite was prepared by the concentration of (W- 30% Cu). The physical and mineral structure was study ABSTRACT xxi by X-ray diffractometer. SEM and TEM were used to determin the morophologe and size of crystals. FTIR was also used to assese the formation of CuWO4. Thermal analysis was carried out by using TGA, DTA, to determin the stability of it. Also the AC conductivity was measured. Then CuWO4 nanocomposite was used as partial replacement of cement by different ratios (0.0%, 0.5% & 4.0%) to prepare mortar which treated for 28 days in tap water. Mechanical test was carried out on it at different ages (3, 7, 14 and 28 days). Physical and radiation test were carried out on samples at age of 28 days. Attenuation coefficient was measured using NaI detector and sources of Cs-137, and Co-60. The instrument used for these measurements were also illustrated. The results decleared from the analysis and discussion of the experimental results of the prepared CuWO4 nanocomposite powder and the mortar samples that: CuWO4 nanocomposite powder can be obtaine with high quality and with size in the range of 6 nm. This material is stable at high temperatures. X-ray diffraction clears the crystalinity and purity of CuWO4 nanocomposite. 0.5% CuWO4 nanocomposite gives better results for water absorbance and prosity than 4.0% ratio. 0.5% CuWO4 nanocomposite gives better results for attenuation coeffient than 4.0% ratio.

.