1) Development of an optimum mix design of lightweight self-compacting concrete
2) Development an optimum mix design of fly ash geopolymer concrete
3) Development a mix design of recycled aggregate concrete
4) Development a mix design of foamed concrete
Also you can derive new constitutive model and investigate the behavior of structural members made by them under impact loading, earthquake loading and blast loading.
Investigating the effect of hybrid nano materials on the mechanical properties and durability of concrete. The hybrid materials could be Carbon nano tubes CNT with nano silica or CNT with nano clay or nano Alumina with CNT...ect. the study could possibly cover the compatability between these nano materials and optimization of the percentages to be used and the utilisation techniques and the impact of that all on the microstructural properties as well as the durability and mechanical properties. The proposed topic could be splitted to at least more than 10 research items. Thank you
You should read some recent review papers on latest developments in concrete materials field so as to get some ideas on where the research gaps are. One example would be our recent paper which you can check at Conference Paper Self-sensing and Self-healing 'Smart' Cement-based Materials...