Concrete normally combines cement, clean sand and a suitably graded coarse aggregate. The required grading and mix design depend on the element, exposure and specified strength, so follow the project or product guidance.
Gravel and Stone for Concrete, Drainage and Sub-Bases
Aggregates provide bulk, strength and drainage across concrete, groundwork and landscaping projects. MacBlair stocks graded stone and gravel products for defined uses, so particle size and cleanliness matter as much as the quantity ordered. Check whether the job calls for coarse concrete aggregate, compactable sub-base material or decorative stone.
Concrete mixes need compatible fine and coarse aggregate in the specified proportions. Drainage layers require free-draining stone without excessive fines, while sub-bases depend on a graded material that compacts firmly. The wider building materials range helps bring together binders and other site essentials.
Use a measured area and compacted depth to estimate volume, then allow for settlement and waste. Timber for structural and outdoor work and roofing materials can be planned alongside aggregates when the groundwork supports a larger construction project.
Aggregate FAQ's
Clean, free-draining stone with limited fines is normally chosen so water can move through the voids. The required size and depth depend on the drain design, pipework and surrounding soil.
Multiply the length by width and compacted depth to find the finished volume. Convert that figure using the supplier’s stated coverage or bulk density, then allow for compaction, uneven ground and normal waste.
Single-size aggregate has particles within a narrow size band and leaves more open voids, which can aid drainage. Graded aggregate contains a spread of sizes that pack together more densely and is often selected for compacted layers.
Sub-base and fill materials usually need controlled placement and compaction in layers. Decorative stone and drainage aggregate may be placed differently, so follow the build-up specified for the intended use.