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. When planning a concrete construction project, it is important to understand the different classifications of aggregates. 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. Lightweight, ultra-light aggregates are more porous than their heavier counterparts and can be used in green roof construction, for example.
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. The shape of the aggregated particles and the texture of the surface are important for proper compaction, deformation resistance and workability. The shape of the aggregates chosen will have a significant effect on the workability of the concrete. However, the ideal shape for HMA and PCC is different because the aggregates serve different purposes in each material.
If you need specific advice on the type of aggregates needed for your needs, it's helpful to talk to professionals. There are several common tests used to identify and quantify the shape of aggregated particles and the texture of the surface. Aggregates generally come in a variety of forms, such as angular aggregate, flaky aggregate, elongated aggregate, rounded aggregate, sub-rounded aggregate, cubic aggregate, etc. Aggregates form an essential part of many construction projects, from large-scale commercial works to smaller household works.
At HMA, 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. However, in HMA, lower interlocking is generally a disadvantage since rounded aggregate will continue to compact, push and groove after construction. Whether you need aggregates to form a subbase for foundations or pavements, decorative aggregates for driveways and paths, or just need something to fill in unsightly holes, you need to know what type of aggregates will work best. When selecting an aggregate for your project it is important to consider its shape and texture as well as its purpose. Rounded aggregate is not suitable for concrete but can be used in other applications such as green roof construction. Angular shaped cubic particles with a rough surface texture are best for HMA due to their ability to provide rigidity and strength when interlocking with each other.
A reliable aggregate supplier will be able to provide you with the perfect selection of aggregates for your project.