Engineer Bilal

May 20th, 2015
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REQUIREMENT S a) Specif ied minimum strength = 20 N/Sq mm b) Durability requirements i) Exposure Moderate ii) Minimum Cement Content = 300 Kgs/cum

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Engineer Bilalby mughal123456 | studymode.come ngine e m m/co ncrete-mix-design-m-20-grade-o f-co ncrete.html/co mment-page-2Concrete Mix Design M 20 Grade Of Concrete1. REQUIREMENT Sa) Specif ied minimum strength = 20 N/Sq mmb) Durability requirementsi) Exposure Moderateii) Minimum Cement Content = 300 Kgs/cumc) Cement(Ref er Table No. 5 of IS:456-2000)i) Make Chetak (Birla)ii) Type OPCiii) Grade 43d) Workabilityi) compacting f actor = 0.7e) Degree of quality control Good2. T EST DATA FOR MAT ERIALS SUPPLIEDa) CEMENTi) Specif ic gravity = 3.05ii) Avg. comp. strength 7 days = 46.5 more than 33.0 OK28 days = 55.0 more than 43.0 OKb) COARSE AGGREGAT Ei) 20mm GradedType Crushed stone aggregateSpecif ic gravity = 2.68Water absorption = 1.46Free (surf ace) moisture = 0c) FINE AGGREGAT E (Coarse sand)i) Type Natural (Ghaggar)Specif ic gravity = 2.6Water absorption = 0.5Free (surf ace) moisture = 1.43. TARGET MEAN ST RENGT H (T MS)a) Statistical constant K = 1.65b) Standard deviation S = 4.6T hus, T MS = 27.59 N/Sqmm4. SELECT ION OF W/C RAT IOa) As required f or T MS = 0.5b) As required f or Mod

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