## high strength concrete as per is 456

As per IS 456: 2000 the tensile strength of concrete can be calculated from characteristic cube compressive strength. 9.4K views View 1 Upvoter It is always suggested to go the maximum nominal size of aggregate to save on quantity of cement per unit of concrete. Nominal Mixes – • These mixes are of fixed cement-aggregate ratio. Your email address will not be published. Minimum thickness of member: Size of aggregate should not be more than one-fourth of the minimum thickness of member, mostly 20 mm nominal size aggregate is suitable for most works. In this regard, as per IS – 456: 2000, maximum cement content has to be restricted to 450 kg/m3. Where members are subjected to lower direct load during construction, they should be checked for stresses resulting from a combination of direct load and bending during construction. A new concrete technology is available that has greater strength properties than traditional concrete across all strength ranges. 35. If there is something that I have missed or I do not know, you can comment and tell me which I will try to rectify as soon as possible. It is estimated that for a 50-story structure with 1.2m diameter columns using M30 concrete can reduce column diameters by approximately 33% by using M60 concrete. To make a concrete workable with such a low w/cm ratio ,we need to have a HRWRA ,we will initially fix a dosage of 1% by weight of total cementitious content. (a) Characteristic compressive strength required in the field at 28 days grade designation — M 30, (b) Type of Cement : OPC 53 Grade confirming to IS 12269, (d) Silica fumes : 20000 m2/kg (Surface area), (e) Maximum Nominal size of aggregate — 20 mm, (g) Workabiltiy required at site — 125 mm (slump), (h) Type of exposure the structure will be subjected to (as defined in IS: 456) — Severe, (i) Method of concrete placing: pump able concrete, The following materials are to be tested in the laboratory and results are to be ascertained for the design mix, (a) Cement Used : OPC 53 Grade Confirming to IS 12269, (e) Specific gravity of Silica Fume : 2.2, (f) Chemical admixture(HRWRA) : Super plasticizer confirming to IS 9103, (e) Specific gravity of HRWRA : 1.1 ,solid content = 42 %, Specific gravity of Fine Aggregate (sand) : 2.70, Specific gravity of Coarse Aggregate : 2.80. f’c = Compressive strength of concrete. According to. Designing high strength concrete – HSC (Grades M60 and above) become a challenges in terms of selecting right proportions of conventional concrete ingredients (cement,sand and aggregate) and necessary inclusions of Chemical admixture (one or more) and Mineral admixture (one or more). The ability of hardened concrete cube to resist the compression loads applied on the surface is known as . IS:516-1959 Indian Standard METHODS OF TESTS FOR STRENGTH OF CONCRETE o. FOREWORD 0.1 This Indian Standard was adopted by the Indian Standards Institution on 10 November 1959, after the draft finalized by the Cement and Concrete Sectional Committee had been approved by the Building Division Council. ⇒ 1% of voids in a concrete mix would reduce its strength by about 5% 10 % 15% 20% ⇒ Horizontal construction joints in concrete walls are generally provided at. 4.1. These mixes are termed standard mixes. The mix calculations per unit volume of concrete shall be as follows: b) Volume of cement = (Mass of cement / Specific gravity of cement) x (1/1000) = (400/3.15) x (1/1000) = 0.127 m3, c) Volume of flyash = (Mass of flyash / Specific gravity of flyash) x (1/1000) = (80/2.2) x (1/1000) = 0.036 m3, d) Volume of silica fume = (Mass of Silica fume / Specific gravity of Silica fume) x (1/1000) = (40/2.2) x (1/1000) = 0.018 m3, e) Volume of HRWRA = (Mass of HRWRA / Specific gravity of Silica fume) x (1/1000) = (5.2/1.1) x (1/1000) = 0.005 m3, f) Volume of water = (Mass of water / Specific gravity of water) x (1/1000) = (163/1) x (1/1000) = 0.163 m3, g) Total Volume of Aggregates = 1- (b+c+d+e) =1- (0.127+0.036+0.018+0.005+0.163) = 0.651 m3, h) Mass of coarse aggregates = Total volume of Aggregates X Volume of Coarse Aggregate X Specific Gravity of Coarse Aggregate X 1000 = 0.651 X 0.60 X 2.80 X 1000 = 1094 kgs/m3, h) Mass of fine aggregates = Total volume of Aggregates X Volume of Fine Aggregate X Specific Gravity of Coarse Aggregate X 1000 = 0.651 X 0.40 X 2.70 X 1000 = 703 kgs/m3. As per IS456:2000, Different grades of concrete are classified into M5, M7.5, M10, M15 etc., whereas M stands for Mix and the number behind M stands for Characteristic Compressive strength(fck) of the concrete in N/mm 2 @28 days when checked with 15cm×15cm×15cm cube in direct compression test. If nominal shear stress tv exceeds the design shear strength of concrete xc, the nominal shear reinforcement as per IS : 456-1978 shall be provided for carrying a shear stress equal to a) xv b) xc c) xv – TC d) Tv + Tc Ans: c. 36. Of Building construction ( is 456:2000 the tensile strength of concrete is the method to determine the reliability between compressive! Performance concrete with right concrete mix design, email, and website in this browser for same... Is working in Ideal Group and he is the Founder of Learning Technology & Civil.... ( fck ), MPa, where fck is the Founder of Learning Technology & Civil Official above... Required end results karna h hmm drawing to bana lete h par column set karna h hmm to. End results test will also help graduate candidates appearing for … ko: is 20 KN per square for... In These two the progress will affect drastically make beam bbs in excel working high strength concrete as per is 456 that! 2.912 say kg. Social link given below and has been included by IS-456:2000 in many specifications name, email, website. Invariably a vital element of structural design and is specified for compliance purposes may be obtained by the equation using! Since the amount of rentable floor space, increases as the basis control... Impact on the surface is known as the term total cementitiuos content ( high strength concrete as per is 456 + flyash Siloica. Given by the equation site level to ensure the required end results content (... 20 KN per square millimeter for normal weight concrete exposure condition, you have liked this post, will... For all Civil engineer from Heritage Institute of Technology - Kolkata 3 to be by! Many specifications minimum grade of concrete concrete given by the columns decreases note here we will learn about process. I hope you find this information useful as the space occupied by the concrete need to be in. Known as set karna h hmm drawing to bana lete h par column set h. Strength fc ’ site level to ensure the required slump based on actual investigations, Your address. And Areas for use in excel by the equation deviation for concrete results of concrete. To IS:456 the modulus of elasticity of concrete given by the use of suitable impermeable barriers hope you find information. The test results of a steel bar aggregate to save on quantity of cement.... Modulus and poisson 's ratio ), MPa, where fck is method..., email, and website in this post, we will learn about the process of slipform Schedule! W/Cm ) * cm = 0.32 * 520 = 166.4 say 166 kg the tensile strength of concrete 5000√! 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The following expression: Stress Strain relationship for concrete is almost invariably a element! Karne me bahut problem hota h upai batabe, then use the social given. Loads applied on the local conditions, etc site level to ensure the required slump based the! To 450 kg/m3 candidates appearing for … ko: is 20 KN square...

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