Large constructions such as Bridges, dams requires huge amount of concrete, using the right quantity of constituents make the structure economical. In this type of mix, the mix ratios and concrete constituent proportions are prefixed and specified. It was also found that for the same nominal maximum aggregate size specimens, the coefficient of variation increased as the cylinder size decreased.The properties of concrete were studied when the proportions of 37.5 and 19.5 mm stone in the coarse aggregate were varied. Unit weight of dry rodded coarse aggregate. To know the Concrete Mix Design follow below:-As per  BS 8500-2 British/European standards The grade of concrete is  denoted as C10, C15, C20,C25, etc., The grade of concrete is also denoted as C16/20, C20/25, C25/30, etc., which means Different grades of concrete has different Concrete Mix proportions which means different concrete mix ratios. Concrete cubes and beams were produced in accordance with BS 1881-108 (1983) and ASTM C293 with varying aggregate sizes 9.0mm, 13.2mm, 19mm, 25.0mm and 37.5mm, using a standard mould of internal dimension 150x150x150 for the concrete cubes and a mould of internal dimension of 150 x 150 x 750mm for the reinforced concrete beam. And how can we use them while Designing a mix?Following points part of the answer to the question :There is ACI method available for the same exercise ACI 211.1is the code you can use. Considering the same it had be decided upon by Civil design Engineers to take a factor of safety ranging from 1.54 to 1.57 to counter that shrinkage.To calculate the Quantity of Cement in Concrete the following formula is used.The following steps are followed to find the quantity of sand in  1mSand usually consists of moisture content.

20, No.1 (Pure and Eng. The reason being: With constant research and development in … Can be a single sized material typically 20mm, 14mm, 10mm,or 7mm or a graded aggregate consisting of a blend of single sized aggregate. For each cylinder size, as the nominal maximum aggregate size increased, the coefficient of variation increased. The compressive strength and flexural strength therefore play a crucial role. You can use same method to calculate any grade of concrete. Concrete Mix Design Data Required for Concrete Mix Design (i) Concrete Mix Design Stipulation (a) Characteristic compressive strength required in the field at 28 days grade designation — M 25 (b) Nominal maximum size of aggregate — 20 mm (c) Shape of CA — Angular (d) Degree of workability required at site — 50-75 mm (slump) Accordingly all concrete of above M-20 Grade for RCC work must be of design mixes. In general, to maintain a 100 mm slump, water demand decreased as the proportion of 37.5 mm stone in the coarse aggregate fraction increased.Key words: concrete, compressive strength, workability, slump, aggregate, size, cement.Self-Compacting concrete (SCC) needs no external vibration and compacts fully under its self weight. The results showed that the reduced and the standard specimens have similar compressive strengths, despite the reduced ones having presented higher variability of results.

The first series of FGFRPAC were prepared and reinforced in three layers of 3%, 1.5% and 3% with crimped, hooked end. With a growing number of parts manufactured directly by additive manufacturing techniques, it is important to lay down design principles suitable for such manufacturing processes and to ensure parts are designed for additive manufacturing. Concrete mix design belongs to the method of determining the ratios of concrete mix in terms of proportions of cement, sand and coarse aggregates. Thank you for helping keep Eng-Tips Forums free from inappropriate posts.Join your peers on the Internet's largest technical engineering professional community.

Furthermore, most of the existing studies focus on granite wastes.