Structural Sustainability of Lightweight Concrete girder A Thesis Submitted to the College of Engineering of the University of Kerbala in Partial Fulfillment of the Requirements for the Degree of Master in Civil Engineering (Infrastructure) By Sajjad Abdul Amir Bader (B.Sc. in Civil Engineering 2015) Supervised by Asst. Prof. Dr. Laith Shakir Rasheed Prof. Dr. Shakir Ahmed Salih Republic of Iraq Ministry of Higher Education and Scientific Research University of Kerbala College of Engineering Civil Engineering Department