What is the difference between 12 and 13 aggregate in construction?

Aggregate specifications are numerous, and within the sand and gravel industry, 12mm and 13mm aggregates are frequently referenced. These two specifications find extensive application in motorways, railways, hydraulic engineering, construction rubble, and manufactured sand processing, offering considerable profit margins. So, what distinguishes these two construction aggregates?

What distinguishes 12 and 13 aggregate in construction?

The primary difference lies in their width dimensions: 12mm aggregate denotes crushed stone measuring 10-20mm, while 13mm aggregate refers to 16-31.5mm crushed stone. Other specifications include 05 aggregate (5-10mm crushed stone) and 2-4 aggregate (10-15mm crushed stone), among others. Construction projects utilise a wide range of aggregate specifications, with the aforementioned grades being particularly common.

In market usage, their sales volumes are comparable. Why is this? As various engineering projects progress, aggregate demand continues to rise—especially for 12mm and 13mm aggregates. The selection for a project depends on standard or design requirements for graded mixes, which combine multiple single-size aggregates to form a continuous gradation. For small-volume concrete mixes, smaller 12mm aggregate is preferable as it yields better slump and higher flowability. Conversely, for large-area, high-volume applications—such as foundation pouring for cement silos involving dozens of cubic metres at once—13mm aggregate is relatively more suitable. Naturally, if technical specifications stipulate clear requirements, these must be strictly adhered to.

Within the broad category of mobile crushers producing 12mm and 13mm aggregates, various models exist, each with differing price points. Therefore, precise quotations require designing production lines and selecting equipment based on the user's actual production requirements. Should you be interested, OCP Machinery, a specialist manufacturer of mobile crushers, offers complimentary consultations. Our experienced technical managers will design production lines and recommend equipment selection free of charge, providing detailed quotations. Click the website chat icon for immediate free consultation.