Concrete Mix Design Using (DOE - British) Method

Explore concrete mix design as selecting cement, water, and aggregates to achieve target strength, using the British Doe method and factors like workability and aggregate size.

This lecture introduces the DOE method sheets for concrete design, guiding five stages to determine target strength, water–cement ratio, water and cement content, and aggregate quantities for a 30 MPa, 28-day target.

Learn to design grade 30 concrete using the DOE (British) method by collecting essential data; cement type, aggregate size and source, workability, water–cement ratio, cement content, and 28-day strength.

Determine the target mean strength for a 30 MPa concrete at 28 days by applying a margin based on the standard deviation and defect rate using the British DOE method.

Determine the water-to-cement ratio by linking the target main strength to a 0.47 ratio via table two and figure four for 42.5 cement and 28-day strength, below the 0.55 limit.

Determine the water content for the concrete mix using table three, given a 20 mm maximum aggregate size, crushed aggregates, and a slump range of 10-30 mm.

Determine the cement content by applying the water-to-cement ratio of 0.47 to the calculated water content of 160, yielding 340, exceeding the minimum 290.

Determine the total aggregate content in stage four using relative density 2.6 and figure five, then compute 1900 by 2400 minus 340 cement and 160 water.

Determine fine aggregate content through a 600 micrometer sieve, using figure six with a 20 mm max aggregate and 0.47 water to cement ratio to yield 27% fine aggregate.

Outlines final mix proportions for concrete C30 using the British DOE method, with cement, water, and aggregates per cubic meter, scaled to 0.05 m³ to achieve 30 MPa.