gunite: a mixture of cement and sand and water that is sprayed on a surface under pneumatic pressure
building material: material used for constructing buildings
starch: a complex carbohydrate found chiefly in seeds, fruits, tubers, roots and stem pith of plants, notably in corn, potatoes, wheat, and rice; an important foodstuff and used otherwise especially in adhesives and as fillers and stiffeners for paper and textiles