Characterization of Mortar from Church Ruins in Barangay Budiao, Daraga, Albay John Carlo A. Mangay, Eric T. Miranda, John Mark S. Anicas, Angel S. Recto and Jan-Michael C. Cayme MATEC Web Conf., 213 (2018) 02001 Published online: 15 October 2018 DOI: 10.1051/matecconf/201821302001