The effect of steam curing on chloride penetration in geopolymer concrete Januarti Jaya Ekaputri, Inne Syabrina Mutiara, Siti Nurminarsih, Nguyen Van Chanh, Koichi Maekawa and Davin H. E. Setiamarga MATEC Web Conf., 138 (2017) 01019 Published online: 30 December 2017 DOI: 10.1051/matecconf/201713801019