Effects of microbial agents to the properties of fly ash-based paste Kiki Dwi Wulandari, Januarti Jaya Ekaputri, Triwulan, Chikako Fujiyama and Davin H. E. Setiamarga MATEC Web Conf., 195 (2018) 01012 Published online: 22 August 2018 DOI: 10.1051/matecconf/201819501012