The shape and texture of the aggregate can have a major impact on the properties of fresh concrete, more so than hardened concrete. Smooth, rounded aggregates are more workable than rough or elongated angular aggregates. Coarse-grained aggregates measure above the 4.75 mm limit and are usually natural stone or gravel that has not been crushed or processed. These aggregates can reduce the amount of water needed for a concrete mix, which can also reduce workability but improve its innate strength.
Cubic aggregate has the highest strength in concrete, since it has good packing and strength in all directions. It is important to understand the different classifications of aggregates when planning a concrete construction project. There are several common tests used to identify and quantify the shape of aggregated particles and the texture of the surface. Aggregates purchased in batches from a reputable supplier can have a uniform shape, if needed, but you can also mix aggregate forms if needed.
However, the ideal shape for HMA and PCC is different because the aggregates serve different purposes in each material. Lightweight, ultra-light aggregates are more porous than their heavier counterparts, so they can be put to great use in green roof construction, for example. However, in PCC, where aggregates are used as an inexpensive high-strength material to occupy volume, workability is the main problem with respect to particle shape. In general, aggregates come in a variety of forms, such as angular aggregate, flaky aggregate, elongated aggregate, rounded aggregate, sub-rounded aggregate, cubic aggregate, etc. If you need specific advice on the type of aggregate required for your needs, it is helpful to talk to professionals.
A reliable aggregate supplier will be able to provide you with the perfect selection of aggregates for your project, ensuring that they meet the quality requirements to form an integral part of your concrete mix. Aggregates form an essential part of many construction projects, from large-scale commercial works to smaller domestic works. The shape of the aggregates chosen will have a significant effect on the workability of the concrete.