The use of hazardous sludge solidification and green-lipped mussel shells in cementitious material: a case study of ngcc power plant of priokSamuel Dwima Halim, Edbert Rainer, Chris Ryantonius, Bagas Panandito, Doni Wardoyo, Mhd Reza Fahlevy and Ivan Sandi DarmaMATEC Web Conf., 147 (2018) 01008DOI: https://doi.org/10.1051/matecconf/201814701008