CE 281 IL ENGINEERING MATERIALS Quiz # 3 Q.1 Define solid and hollow masonry units according to ASTM C90. Q. 2 What are the advantages of masonry walls over framed (wood) walls? What are three types of organisms that attack wood? Q.3 What is the mortar made of? What are the functions of the mortar? What is the grout? What is the grout used for? What are the ingredients of the plaster? What is it used for?