Development of building blocks using vegetable oil and recycled aggregate Mohamed I. Attia, Salah Zoorob, Khaled Hassan, Hozaifa El-husseini, James M. Reid and Mohamed S. Al kuwari MATEC Web Conf., 120 (2017) 03006 Published online: 09 August 2017 DOI: 10.1051/matecconf/201712003006