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. Depending on the shape, the aggregate is classified into several categories. The workability of concrete is affected by the shape of the aggregate. 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.
There are several common tests used to identify and quantify aggregate particle shape and surface texture. Whether you need aggregates for a subbase for foundations or pavements, decorative aggregates for driveways and paths, or just something to fill in unsightly holes, you need to know what type of aggregates will work best. Knowing the different classifications of aggregates is a good starting point when planning a concrete construction project. The shape of the aggregated particles and the texture of the surface are important for proper compaction, deformation resistance and workability. However, in HMA (Hot Mix Asphalt), lower interlocking is generally a disadvantage since rounded aggregate will continue to compact, push and groove after construction.
Therefore, angular aggregate is very suitable for high-strength concrete and for pavements under stress. This is why rounded aggregate is not suitable for high-strength concrete and for pavements under stress. 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. At HMA (Hot Mix Asphalt), since aggregates are relied on to provide rigidity and strength when interlocking with each other, angular shaped cubic particles with a rough surface texture are best. Due to the reasons mentioned above, the rounded aggregate shows high workability compared to angular, flaky or elongated aggregates.
Aggregates form an essential part of many construction projects, from large-scale commercial works to smaller domestic works. However, the ideal shape for HMA (Hot Mix Asphalt) and PCC (Portland Cement Concrete) is different because the aggregates serve different purposes in each material. The shape of the aggregates chosen will have a significant effect on the workability of the concrete. Aggregates purchased in batches from a reputable supplier can have a uniform shape if needed but you can also mix aggregate forms if needed. If you need specific advice on the type of aggregates needed for your needs it's helpful to talk to professionals.