67. This specification helps as a guide for how to carry out cement concrete works for various purposes. In winters, if temperature drops below 4.5 Degree Celsius than stop concrete work immediately. Among the most important properties of ordinary concrete, the following may be mentioned. Mass concrete, plain—Mass concrete containing no rein-forcement or less reinforcement than necessary to be consid-′.. Finishing of Exposed surface- All exposed surfaces of the concrete work shall be finished with 12mm thick cement plaster of sagol finish and three coats of white or colour was shall be applied on these exposed … The inner surface of shuttering shall be oiled to prevent concrete sticking to it. While writing detailed specifications, explain the specifications of every single ingredient in detail. The stone ballast shall be 20 mm in size and smaller. In summers, temperature of concrete should not exceed 38 Degree Celsius. • The shuttering and framing is sufficiently braced. 1:2:4 (cement : sand : stone ballast) by volume when specified. PLAIN CONCRETE PAVEMENT WITH JOINTS Plain concrete pavement with joints has no reinforcing steel but is constructed with various transverse joint spacing (joints from edge of pavement to edge of pavement). Smooth the top layer, whenever concrete pouring is finished. The concrete shall be laid in forms and tapped in such a way that no honeycomb surface appears on removal of the forms. In case, vibrator is not possible to arrange then use Rod for compaction. Plain Cement Concrete (PCC) is a construction material generally used as a binding materials and is composed of cement, (commonly Portland Cement) and other cementitious materials such as fly ash and slag cement, aggregate (generally a coarse aggregate made of gravels … Reinforced cement concrete (R.C.C) is the combination of ordinary concrete with the reinforcement to increase its compressive and tensile strength to a great extent. 516-1959 Methods of test for strength of concrete 1161-1963 Specifications for steel tubes for structural purpo ses 1199-1959 Methods of sampling and analysis of concrete. 1.3 The work also … Concreting under water should be completed simultaneously and avoid joint between two concrete layers. of plain & reinforced concre te for dams & other massive structure. The types of joints used in plain concrete are shown in Figure 1-3. After about two hours of laying of concrete, when the concrete has begun to harden, it shall be kept damp by covering with wet gunny bags or wet sand for 24 hours. Group: Concrete Grade: Mix Ratio: Characteristic Compressive Strength (N/mm2) Ordinary Concrete : M5: 1 : 5 : 10: 5 N/mm 2: M7.5: 1 : 4 … Materials-All materials shall be per standard specification. 1.1 The detailed specifications given hereafter are for the items of works described in the schedule of quantities attached herein, and shall be guidance for proper execution of work to the required standards. Om G Designs. Don’t compact coarse aggregates while proportioning. Practice [CED 2: Cement and Concrete] July 2000 IS. The cement concrete topping, normally consisting of 1:2:4 (1 cement :2 sand : 4 stone aggregate) is then laid in required thickness in one operation in the … Plain and Reinforced Concrete Specification May 2017 Process Industry Practices Page 3 of 16 – ASTM C33/C33M - Standard Specification for Concrete Aggregates – ASTM C150/C150M - Standard Specification for Portland Cement – ASTM C618 - Standard Specification for Coal Fly Ash and Raw or Calcined Natural Pozzolan for Use in Concrete or anythin simplier. 16. If you continue to use this site we will assume that you are happy with it. 5 /5 … The scope for work covered under this specifications pertain to excavation of foundations, trenches, pits and over areas, in all sorts of soil, soft and hard rock, correct to dimensions given in the drawing including shoring, protections of existing underground utilities of any, such as water lines, electric cables etc. In regards to specification and standards, BS EN 13670: basic, ordinary, plain and special … Size of sand particles should be such that it passes through 4.75mm sieve. 2 For 150 mm thick Walls 21 Hollow Cement Concrete Block Masonry in CM 1 : 6 in Super structure 21. Sand is used as fine aggregate in cement concrete. Pouring of concrete should be done in layers whose thickness should not exceed 6 inches. These stones should be hard, tough, durable and clean. RWD Tender For Civil Works Roads Mmgsy Ndb Brrp 320 Benipur , Due Date: 11-01-2021 ,Tender Value: 50037100 ,City : BENIPUR, Location: Bihar Tender Notice 26489348 General Specifications (Flooring) First Class Building s 2.5cm cement concrete over 7.5cm lime concrete Second Class Building s 2.5cm cement concrete over 7.5cm lime concrete. For example, for M20 concrete, mix proportion will be 1:1.5:3 for cement:sand:coarse aggregates. RCC (1:1.5:3) for slabs, beams, lintels and staircase: Proportion-The proportion of cement concrete shall be of one part of cement, two parts of sand four parts of aggregates by volume.Cement-The cement shall be used in this work shall comply with the standard requirements.Fine Aggregate-The sand to be used shall be clean and coarse and shall be free from any organic or vegetable matter. Detailed Specifications for Cement Concrete provides a step by step description and specifications for various phases of concrete production and application such as materials, mix proportions, mixing of content, workability, formwork, laying and curing. This results in segregation of concrete. I take the vision which comes from dreams and apply the magic of science and mathematics, adding the heritage of my profession and my knowledge of nature's materials to create a design. 4 and size No. specifications in much greater detail, Following are the factors involved in the design process ... durability in hardened concrete. by the Cement and Concrete Sectional Committee had been approved by the Civil Engineering Division Council. natural sources for concrete. (1) IS 269 Specification for 33 grade Ordinary and low heat, portland cement (2) IS 383 Specification for Coarse and fine aggregates from natural sources for concrete (3) IS 456-2000 Code of practice for plain and reinforced concrete (4) IS 460 Specification for test sieves (Part I, II & III) i) Wire cloth test sieve Sorry, your blog cannot share posts by email. Detailed specifications of Cement Concrete, Subscribe to Engineering Intro | Engineering Intro by Email, The Importance of Fall Protection Systems on Construction Sites, Pressure Vessels & Benefits of Rupture Disc, How Termites Can Destroy the Foundations of a House and What to Do About It, How to Identify, Classify & Manage Project Stakeholders, Strains In Concrete | Strains Amount | Elastic Strains. Post was not sent - check your email addresses! This makes a strong joint with the new layer whenever it is casted. Mixing machine is used for large scale construction works. Cement used for construction work should be fresh and it should meet the standard specifications.eval(ez_write_tag([[250,250],'engineeringintro_com-box-3','ezslot_8',107,'0','0'])); Sand is used as fine aggregate in cement concrete. FILLING . Concrete can have different properties depending upon the mixture that is used in creating it, which contains cement, chemical admixtures, and aggregates. Separate size No. The cement concrete shall be kept well watered for at least 20 days. Sea sand shall not be used. In plain cement concrete coarse aggregate should be hard durable and free from impurities. The slag cement inspection is based on the standard test methods for determining the physical properties of slag cement. 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