Standardized Prescribed Concrete (SPC)| BS 8500-2

SPC or standard mixes of concrete are concrete that are defined list of concrete within BS 8500, that mentions the prescribed quantity of materials as per the British Standard.

SPC is usually mixed at the .site or obtained from a supplier with no quality standards.

The strength guaranteed by these mixes is, fair as they are the basic concrete mixes, as they are designed based on the assumed values contained within BS 8500. The types of SPC, their strength  , and their applications are mentioned in table below.

Type Of SPC	Description	Strength 28 Days (N/Mm2)	Applications
ST1	Wet Lean Mix Concrete	7.5	Commercial & Domestic Projects – Structural & Non-Structural Applications	Kerb bedding Backing Blinding Haunching Drainage works
ST2	Versatile Mix	10	General and Housing Application – Ideal for un-reinforced foundations	un-reinforced strip footings trench-fill foundations some agricultural applications drainage works blinding house floors pad foundations non-structural mass concrete in non-aggressive (DC-1) ground conditions footings for fence posts infilling around manholes small bases for external furniture, such as patios mass concrete fill
ST3	Light Duty	15	Domestic applications & foundations	shed and workshop bases foundations for large walls, garages, houses, and extensions paving for patios unreinforced bases and oversites for conservatories, garages, sheds, and greenhouses
ST4	Light Traffic	20	Domestic, agricultural, and industrial applications	garage floors (not designed as suspended and not reinforced) shed and workshop bases internal floor slabs (containing no embedded metal) drain/channel bedding benching to chambers
ST5	Light Traffic	25	domestic, commercial, and agricultural application	agricultural equipment stores foundations for environmental barrier posts and planted lighting columns foundations for traffic signposts house and garage ground floor slabs fully or nominally reinforced, either ground bearing, suspended or over sub-floor voids

Mix Proportions for Standardized Prescribed Concrete

The mix proportions for standardized concrete as BS 8500-2: 2002 as per Table-10 are given below.

Also Read: Factors Affecting Workability of Concrete