This can lead to saving in transportation costs from longer distances. 2: Approximate free-water content (kg/m3) required to give various levels of workability for non-air-entrained (with normal entrapped air) concrete. Disclaimer | *Eng-Tips's functionality depends on members receiving e-mail. DOE METHOD OF CONCRETE MIX DESIGN: The British method of concrete mix design, popularly referred to as the "DOE method", is used in the United Kingdom and other parts of the world and has a long established record. The mean compressive strength required at a specific age, usually 28 days, determines the nominal water-cement ratio of the mix. 10mm aggregate concrete mix design vs 20mm. Concrete is a mixture of cement, water, coarse and fine aggregates with or without chemical and mineral admixtures. Type of aggregates – whether mixed graded aggregate will be usedor 20mm, 10mm aggregates will be used separately. v. Supervision – whether qualified staff will be present to supervise concreting workand make necessary corrections e.g. (e) Fine aggregates confirm to Zone II of IS – 383. Login to The Constructor to ask questions, answer people’s questions, write articles & connect with other people. However, this method is simple and, if carefully considered, gives relatively satisfactory results. 6. The values of fineness modulus more than this value make the concrete harsh, while a lesser value leads to an uneconomical mix. Kishore Kaushal, “Method of Concrete Mix Design Based on Flexural Strength”, Proceeding of the International Conference on Road and Road Transport Problems ICORT, 12-15 December, 1988, New Delhi, pp. INTRODUCTION: a) Water = 175 – (175 x 0.15) = 149 kg/m3 say 149 kg/m3, c) Density: 10 x 2.65 (100 – 1.5) + 355 (1 – 2.65/3.15) – 149 (2.65 – 1) You may have published this but above report would not fully download. Sorry, you do not have permission to ask a question, You must login to ask question. Concrete mix design is the method of correct proportioning of ingredients of concrete, in order to optimize the above properties of concrete as per site requirements. Copyright Policy | 3. (a) Characteristic compressive strength required in the field at 28 days grade designation — M 25, (b) Nominal maximum size of aggregate — 20 mm, (d) Degree of workability required at site — 50-75 mm (slump), (e) Degree of quality control available at site — As per IS:456, (f) Type of exposure the structure will be subjected to (as defined in IS: 456) — Mild, (g) Type of cement: PSC conforming IS:455, (h) Method of concrete placing: pump able concrete. Since the aggregate is saturated surface dry condition hence no correction is required. Lost your password? 1. The proportioning of ingredient of concrete is governed by the required performance of concrete in 2 states, namely the plastic and the hardened states. of concrete on the basis of saturated and surface dry aggregates: Water = 149 kg/m3 However, if crushed sand is properly graded with adequate fines the mix may have lower water demand when compared to poorly graded natural sand. At the time of concreting, moisture content of site aggregates are to be determine. The process of selecting suitable ingredients of concrete and determining their relative amounts with the objective of producing a concrete of the required, strength, durability, and workability as economically as possible, is termed the concrete mix design. With the use of superplasticizer the saving in cement is 62 kg/m3 and water 26 lit/m3 for PPC and OPC. workability, bleeding and finishing qualities. Cement = (438.7 x 0.016878) kg/m3 = 7.4 kg, Coarse aggregate = (1071.11 x 0.016878) kg/m3 =18.07 kg, Fine aggregates = (757.28 x 0.016878) kg/m3 = 12.78 kg. For trial -1 casting of concrete in lab, to check its properties. For trials say 149 kg/m3, c) PPC = 149/0.42 = 355 kg/m3 296-305. You can list yourself here by submitting civil engineering related topics to us. See how the Generative Topology Optimization extension automatically delivers high-quality, lower-cost, manufacturable designs. iii. Learn how this workhorse of concrete mix design can change the character and performance of a concrete mix By George Seegebrecht. Already a member? I am sure, this research paper will help many civil engineers around the world in understanding how to do mix design for concrete roads as per IRC-15-2002. 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