Concrete Cube Compressive Strength (7 days) Introduction : To determine the strength‚ maximum load can be applied and workability of concrete mixture. Theory : Hard concrete test were conducted at the age of 3‚ 7‚ 14‚ 21 and 28 days after curing(but we tested it for 7 days only). The concrete strength increases according to the age‚the mixture of its concrete design and the strength increment will continue for sometimes. Nevertheless‚ for most of the work‚ the concrete strength on the 28 days
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Results: Compressive Strength of Concrete Structures Using Schmidt Hammer DATA AND CALCULATION SHEET Sample Identification: R14 floor Description: Sample age at test: Element type: Application Direction | | | | Rebound number readings | 26 | 29 | 24 | 32 | 26 | | 31 | 32 | 34 | 22 | 30 | Average Rebound Number | (1) 29 | Estimated compressive strength (MPa) | (2) 28 MPa | Compressive Strength of Cube Concrete
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meet the design requirements of a structure. The compressive strength of concrete is the most common performances measure used by engineer in designing buildings and other structures. The compressive strength is measured by breaking concrete specimen in a compression-testing machine. The compressive strength is calculated from the failure load divided by the cross-sectional area resisting the load and reported in units of N/mm2. Compressive strength test results are primarily used to determine that
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Test A. Introduction As shown by the Griffith criterion‚ tensile strength of brittle materials is theoretical 1/8 of the compressive strength. Typically‚ tensile strength of rock materials is about 1/10 to 1/8 of the compressive strength. Hence‚ rock fails easily under tension. In design‚ rock should be subjected to minimum tensile stress. Several methods are commonly used to test the tensile strength of rocks: 1. Direct tensile test: Metal caps are cemented to the
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Pillars Factor of Safety (FOS) calculation method: CMRI formula CMRI developed a formula for pillar strength taking into account the pillar w/h ratio‚ the uniaxial compressive strength of the pillar‚ the height of seam and depth of cover S = Pillar strength (MPa) σc = Uniaxial compressive strength (UCS) (MPa) h = Working height or seam height (in m) H = Depth of cover (in m) w = Pillar width (in m) Obert-Duvall/Wang Formula (Obert and Duvall‚ 1967) It was derived from
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Engineering Materials Laboratory 4: Compressive‚ Flexural‚ and Tensile Strength of Concrete Lab Section: TH 2–5 PM Unique #: 15785 Lab TA: Janaki Vamaraju Solutions: 1.) In this lab‚ concrete cylinders and beams created from Lab 3 were tested for compressive‚ flexural‚ and tensile strength. The compressive strength of the concrete was found by applying an axial load on the cylinder until the cylinder failed. The flexural strength was calculated by subjecting transverse
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Split-tensile Strength The splitting tests are well known indirect tests‚ were conducted as per IS 5816:1999 and used in the concrete tensile strength determination sometimes called split tensile strength of concrete. The size of cylinder is 300mm length with 150mm diameter or 200mm with 100mm diameter. The specimen were kept in water for curing for 3 days‚ 7 days and 21 days and on test day remove and allow the surface to dry. The test is performed out by placing a cylindrical specimen horizontally
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Strength of concrete Chapter 6 Properties of concrete :- Strength Durability Impermeability Volume stability Strength of concrete is the most valuable property. What is strength? Strength depends on the physical structure and volume of hydration products. Therefore it gives an idea of the quality of concrete. Note :- strength depends less on the chemical composition of the paste and more on the physical structure
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Geopolymer paste is created by combining fly ash‚ which contains alumino-silicate source‚ with a strong alkaline solution. Geopolymer concrete has significant advantages over standard concretes such as resistance to corrosion and fire‚ high compressive and tensile strengths and also less shrinkage. The development of geopolymer concrete is an important step towards the production of environmental friendly concretes. The purpose is apparently to reduce the carbon dioxide emission resulting from the production
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soil. Cylindrical compacted soil and cubic lime specimens with different proportions of the shells and fly ash are made to study the strength variance. Soil‚ which is classified as CL in the USCS system‚ commercialized pulverized oyster shell‚ F-type fly ash‚ and lime are mixed in different weight percentages. Five sample groups are made to study the compressive strength of soil and lime specimens‚ respectively. The lime cubes are made with 0.45 W/B ratio and the cylindrical soils are compacted under
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