COSC 253 – Materials and Methods of Construction | Exam 3 Q&A (80+ Questions) – Masonry, Mortar, Precast Concrete, Stone

This document presents over 80 accurately answered exam questions from Exam 3 of the COSC 253 2025/2026 course, focusing on masonry materials, mortar composition, precast concrete elements, and building stone properties. It covers the fundamental components of mortar (cement, water, sand, lime), the ASTM C270 mortar classifications (Types N, S, M, O, K), and construction techniques such as retempering, joint tooling, and the use of lintels and grouting methods (low-lift and high-lift). Brick production methods—soft mud, dry press, and stiff mud—are explained along with brick laying techniques (stretcher, soldier, rowlock) and support systems for openings like arches and steel angles. The document also explores precast concrete slabs, including solid, hollow core, single-tee, and double-tee designs, casting beds, topping techniques, and various connection methods (welds, bolts, gravity, grout). In addition, the file covers major natural stones used in construction—granite, limestone, slate, marble, and quartz-based materials—highlighting their properties, weather resistance, finishes, and classification by geological origin (igneous, sedimentary, metamorphic). This resource is especially useful for students in construction science, architectural and civil engineering, masonry training, and anyone studying structural materials and systems. It’s also a valuable tool for professional certification or licensing exam prep in the construction industry. Keywords: cosc 253, mortar types, brick masonry, precast concrete, lintels, grout methods, hollow core slabs, double tee, stiff mud process, brick joints, stone masonry, limestone, granite, marble, slate, ASTM C270, fieldstone, bearing pads, engineered connections, masonry arches, carbon fiber reinforcement, casting beds