1) IS code:- this concrete cube test it is completed according to IS code 516Ī) Tamping rod:- tamping rod is used for levelling the surface of concrete cube mould, it is 16mm Dia and 60cm in length.ī) CTM machine : CTM machine is required for load applying on concrete cube mould, it should be apply minimum load of 14N/mm2/minute.Ĭ) THREE type of mould: there is two size of concrete cube mould is used for test, first is larger size of 150mm or 15cm have specific dimension (l×b×h) is 150mm×150mm×150mm with aggregate size is 38 mm and second smaller size concrete cube mould size is 100mm×100mm×100mm with aggregate size 19mm used in India.Compressive strength of M25 concrete cube testĬoncrete cube test Apparatus for procedure and result completed in following steps: If the concrete fails at 14 days, then we will reject that batching. So at sites, we do normally test concrete at this interval. Once it attains certain strength at 7 days, then we know (according to the table) only 9% of strength going to increase. So we can’t predict the strength until the concrete comes to that stable state. M25Concrete Strength OvertimeĪs you can see the m25 concrete gains its strength rapidly till 7th & 14th Days upto 90% after curing, then gradually increases from there. M25 concrete strength over time: Relationship between M25 concrete strength according to time is not linear, it means increasing strength is not increases according to applied load as time increases,it will increase in nonlinear.Ĭoncrete is a macro content with Sand, Cement, & Coarse aggregate as its micro-ingredient (Mix Ratio) and gains its 100% strength over time at the hardened state. The maximum load at which the specimen breaks is taken as a compressive load.Ĭompressive load = 563 kN, cross sectional surface area A = 150mm ×150mm = 22500mm2 or 225cm2, then compressive strength F = P/A = 563 kN/22500mm2 = 25N/mm2.Ĭompressive strength of m25 concrete after 28 days:– 25N/mm2 (MPa) or 3626 Psi is compressive strength of M25 concrete after 28 days Calculation: Now concrete cube test by CTM machine,assuming 563 kN load is applied on concrete cube till the cube collapse.And taken out just before test 28 days to find out compressive strength of M25 concrete after 28 days. Making of at least 3 concrete cube size each 150mm×150mm×150mm in mould by cement sand and aggregate ratio 1:1:2, use tamping rod for levelling the surface of mould, it is kept for 24 hours setting after water mix in concrete, after 24 hours it is kept in water for curing for 28 days. 22.5 N/mm2 (MPa) or 3263 Psi is compressive strength of M25 concrete after 14 days Compressive strength of M25 concrete after 28 days The maximum load at which the specimen breaks is taken as a compressive load.Ĭompressive load = 506 kN, cross sectional surface area A = 150mm ×150mm = 22500mm2 or 225cm2, then compressive strength F = P/A = 506 kN/22500mm2 = 22.5 N/mm2. Calculation: Now concrete cube test by CTM machine,assuming 506 kN load is applied on concrete cube till the cube collapse.And taken out just before test 14 days to find out compressive strength of M25 concrete after 14 days of curing Making of at least 3 concrete cube size each 150mm×150mm×150mm in mould by cement sand and aggregate ratio 1:1:2, use tamping rod for levelling the surface of mould, it is kept for 24 hours setting after water mix in concrete, after 24 hours it is kept in water for curing for 14 days. 16.25 N/mm2 (MPa) or 2357 Psi is compressive strength of M25 concrete after 7 days Compressive strength of M25 concrete after 14 days Compressive load = 366 kN, cross sectional surface area A = 150mm ×150mm = 22500mm2 or 225cm2, then compressive strength F = P/A = 366 kN/22500mm2 = 16.25 N/mm2.
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