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Concrete Mix Design M25 SCC [IS CODE]

In order to determine the mix design quantities of different ingredients for a particular grade of concrete, few steps are required which are as follows: 1.        Determine the target compressive strength The target compressive strength can be calculated by the following formula                                 T fck = T cs + 1.65 SD ……… [IS CODE: 10262-2009]                  Where, T fck is the target compressive strength of concrete.                              T cs is the compressive strength of concrete.                               SD is the Standard deviation.             T he grade of concrete to be designed is M25, then                                            T fck = 25 + 1.65 x 4 = 31.6 N/mm 2                                        2.        Determine the water-cement ratio of the mix & free water content. Determining the water cement ratio is critical for any mix design, no IS Code states any particular w/c ratio for any given mix. I
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Design of a singly reinforced concrete beam as per IS 456:2000

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Design of a singly reinforced concrete beam Example: Design of a singly reinforced concrete beam for the following data.           Clear Span of the beam – 3 m           Width of supports – 200 mm           Working live load – 6 KN/m           Grade of concrete – M20           Grade of steel – Fe-415 HYSD bars Solution: Given Data –   f ck  = 20 N/mm 2 .                         f y    = 415 N/mm 2 .                                                 Load factor = 1.5 for Dead load & Live load. Determination of the dimensions of the beam:               Let us adopt the span/depth ratio of 20 for the given span & loading               Effective depth = d                                            = (Span/20)                                            = 3000 / 20 = 150 mm.               Adopt d = 160 mm.                Overall depth (D) = 200 mm.                Width of beam (b) = 200 mm.               Therefore, E
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Classification of columns

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  Types of columns & their properties Structural Concrete member in compression are generally termed as columns & strut. The term column is used for structural member transferring loads to the ground. As per Indian Standard Code IS 456:2000 clause 25.1.1 defines the column as a compression member whose effective length exceeds three times the least lateral dimension. Whereas pedestal is termed as vertical compression members whose effective length is less than three times its least lateral dimension. Axially loaded columns may fail in any one of the following modes: Pure Compression failure- Where the column generally fails due to the axial load & Buldge at the center of the unsupported length. Combined Compression & bending failure- Where the column generally fails due to the combined effect of axial load & bending due to the presence of beams.   Failure by elastic instability. These modes generally depend on the slenderness ratio of the colum
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