maximum compressive strength of concrete

The characteristic strength of concrete is the result of the compressive strength of the concrete cube test. Concrete's compressive strength requirements can vary from 2500 psi (17 MPa) for residential concrete to 4000psi (28 MPa) and higher in commercial structures. High-strength concrete is typically recognized as concrete with a 28-day cylinder compressive strength greater than 6000 psi or 42 Mpa. the stress-strain curves of high strength concrete in compression. Important Note: As per IS: 516-1959  Minimum three specimens should be tested at each selected age (that means three specimens at 7 days, three specimens @ 14 days & 28 days) If strength of any specimen varies by more than 15%  of average strength, such specimen should be rejected. I also agree that if the concrete is going to be classified as structural, … Lastly, we placed the concrete cube in the compression machine to measure the compression failure load which was 496 kN which enabled us to calculate the compressive strength by using the formula: Compressive strength = F / A; the value of the compressive strength was 48.7 MPa. Moreover, two kinds of concrete strength grades (C30, characteristic compression strength of concrete standard specimen around 30 MPa; and C50, characteristic compression strength of concrete standard specimen around 50 MPa according to GB/T 50010-2010) were selected. Compressive strength of concrete depends on many factors such as water-cement ratio, cement strength, quality of concrete material, quality control during the production of concrete, etc. Buckling of Concrete Columns Higher strengths up to and exceeding 10,000 psi (70 MPa) are specified for certain applications. In normal concrete work, the maximum compressive strength that can possibly be obtained is generally reckoned to be about 7,500 psi for a 28-day cylinder. Hence concrete is safe to use. High-strength concrete (HSC) is a type of concrete with high compressive strength compared to normal-strength concrete (NSC). Cement being the major binding material in concrete needs water for hydration process, but that is only limited to about (0.20 to 0.25) % of cement content. Compressive strength of concrete: Out of many test applied to the concrete, this is the utmost important which gives an idea about all the characteristics of concrete. Keep the test specimens submerged underwater for stipulated time. Concrete has relatively high compressive strength, but significantly lower tensile strength. No strength test falls below the specified compressive strength by more than 500 psi (3.5 MPa) if the specified compressive strength is 5000 psi (35 MPa) or less; or by more than 10 percent of the specified compressive strength if the specified compressive strength exceeds 5000 psi (35 MPa). You can also follow me on fb and twitter by clicking below. Concrete compressive strength for general construction varies from 15 MPa (2200 psi) to 30 MPa (4400 psi) and higher in commercial and industrial structures. Concrete compressive strength is 25 MPa and yield strength of reinforcement bars is 250MPa. Example – If the concrete grade is M20, then the individual crushing value should not be less than 15 N/Sqmm. This interstitial space becomes primary cracks during compressive strength testing of concrete. The compressive strength is typically controlled with the ratio of water to cement when forming the concrete, and tensile strength is increased by additives, typically steel, to create reinforced concrete. Testing specimens are placed in the space between bearing surfaces. Compressive Strength (MPa) 1 3 days 2 3 4 7 days 5 6 7 28 days 8 9 Table 1 : Recordings during Compressive Test on Concrete 6. There are different Grades of concrete such as M10 M15 M20 M25 M30 etc the usage of right concrete grades depends on advice given by the Structural engineer. From the below table it is clear that, Concrete gains 16 % of its strength within 24 hrs, whereas concrete gains 65% of the target strength by the time of 7 days of its casting. PSI is a measure of compressive strength, or the ability of the material to carry loads and handle compression. Sir my name is mahesh and I need particle mix design note sir . : As per IS: 516-1959  Minimum three specimens should be tested at each selected age (that means three specimens at 7 days, three specimens @ 14 days & 28 days) If strength of any specimen varies by more than 15%  of average strength, such specimen should be rejected. The same calculation is done for the specimen at different ages as stated below: As we assumed M20 grade concrete mix which bear a max load upto 20N/mm². Some researchers have observed that the type of coarse aggregate has a greater relative effect on tensile strength than on compressive strength. In fact, the range of compressive strength is 20 to 80 N/mm 2, and the coefficient of variation is 40.2%. Once it sets, After 24 hours remove the concrete cube from the mould. More generally, concrete with a uniaxial compressive strength greater than that typically obtained in a given geographical region is considered high-strength, although the preceding values are widely recognized. Richard P,and cheyrey (1995) achieved the maximum compressive strength 810 mpa in reactive powder concrete,they will made evolution on concrete. Cross sectional area of cylinder can be calculated by measuring the diameter of cylinder on both sides. Therefore, in concrete the characteristic strength of concrete literally means Characteristic compressive strength unlike in other materials like steel or wood, etc. It is assumed that whole of the compression will be taken up by the concrete at the time designing any RCC structure. Thus, once the trigger is pulled there is enough force to test the compressive strength of concrete to a maximum of 5300 PSI (36.9 MPa). so most of the design of the concrete structure is done … Importance of Determining the Compressive Strength: As per IS: 516-1959 Compressive testing machine (2000Kn),15cm×15cm×15cm steel cube molds or Cylinder having Dia 15cm and length 30cm are used. As experiments proved that greater size of aggregate is increased, then the individual crushing should... Normal-Strength … for normal field applications, the development of high-strength concrete is classified according to compressive is! 2500-3000 psi most concrete has been found of the material must be followed to... Steel or wood, etc 7 blocks and the average of 8 blocks strength is initially checked by mix! A material is determined by the concrete strength is 20 to 80 N/mm 2 and! 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