![]() ![]() Relevant particle shape/texture characteristics are discussed below. Therefore, in PCC rounded particles are better. However, in PCC, where aggregates are used as an inexpensive high-strength material to occupy volume, workability is the major issue regarding particle shape. In HMA, since aggregates are relied upon to provide stiffness and strength by interlocking with one another, cubic angular-shaped particles with a rough surface texture are best. However, the ideal shape for HMA and PCC is different because aggregates serve different purposes in each material. It is also used as an aggregate in ready mix concrete.Aggregate particle shape and surface texture are important for proper compaction, deformation resistance, and workability. Quartzite: A metamorphic rock that is used in building blocks and slabs. Hard varieties are sometimes used in building construction. However, due to the harmful components of the rock, it is rarely used in construction. Common uses are columns, flooring, or steps in monumental buildings. Like granite, it can be polished well and is often used for decorative purposes. However, it is important to plaster the surface to eliminate the pores. It is easily quarried in block form and used as a building stone. Laterite: A metamorphic rock with a highly porous and sponge structure. Common examples are roofing tiles, certain types of chalkboards, gravestones, and some pavement applications. Because it is easily mined and cut in these natural layers, it works well in applications requiring thin rock layers. Slate: A metamorphic rock typically found in layers. It is unsuitable for use as a building stone because of its sediment composition. Sandstone: A sedimentary rock used primarily for concrete and masonry work. It is widely available in quarries across the country. One of the most versatile rocks for construction, limestone is able to be crushed easily making it a primary rock used in ready mix concrete, road construction, and railroads. Limestone: A sedimentary rock that is the most commonly used to make crushed stone in the United States. However, they can also be used on bridge piers and river walls. ![]() Because of the color, grain, and polishing ability they are often used inside homes for countertops or on the outside of monumental or civic buildings. Granite: An igneous rock that is durable and is easily polished. Basalt: An igneous rock often used for road pavement or concrete aggregates. ![]()
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