GECOBRIDGE: A concept of a smart eco-friendly integrated bridge utilizing geopolymer and graded concrete technologyM. Mirza Abdillah Pratama, Yustika Dyah Pratiwi, Miftah Aliyil ’Ilmi and Alifah MahardikaMATEC Web Conf., 204 (2018) 06005DOI: https://doi.org/10.1051/matecconf/201820406005