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  2. Properties of concrete - Wikipedia

    en.wikipedia.org/wiki/Properties_of_concrete

    Twenty eight days is a long wait to determine if desired strengths are going to be obtained, so three-day and seven-day strengths can be useful to predict the ultimate 28-day compressive strength of the concrete. A 25% strength gain between 7 and 28 days is often observed with 100% OPC (ordinary Portland cement) mixtures, and between 25% and 40 ...

  3. Structural material - Wikipedia

    en.wikipedia.org/wiki/Structural_material

    Steel is used extremely widely in all types of structures, due to its relatively low cost, high strength-to-weight ratio and speed of construction. Steel is a ductile material, which will behave elastically until it reaches yield (point 2 on the stress–strain curve), when it becomes plastic and will fail in a ductile manner (large strains, or ...

  4. Precast concrete lifting anchor system - Wikipedia

    en.wikipedia.org/wiki/Precast_concrete_lifting...

    And further in AS3850, "The strength limit state capacity shall be determined by a statistical analysis from the test results in accordance with Paragraph A4.5." and assuming the test data is taken from a statistically valid test method , the data is to be determined via statistical means to derive the Load resistance model , for the anchor.

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  6. Electrical resistivity measurement of concrete - Wikipedia

    en.wikipedia.org/wiki/Electrical_resistivity...

    Increasing concrete water content; Increasing concrete porosity; Increasing temperature; Increasing chloride content; Decreasing carbonatation depth; When the electrical resistivity of the concrete is low, the rate of corrosion increases. When the electrical resistivity is high, e.g. in case of dry and carbonated concrete, the rate of corrosion ...

  7. Metal carbonyl - Wikipedia

    en.wikipedia.org/wiki/Metal_carbonyl

    This describes metal carbonyl fragments of M(CO) n as parts of octahedral building blocks in analogy to the tetrahedral CH 3 –, CH 2 – or CH– fragments in organic chemistry. In example dimanganese decacarbonyl is formed in terms of the isolobal analogy of two d 7 Mn(CO) 5 fragments, that are isolobal to the methyl radical CH • 3.

  8. Dimanganese decacarbonyl - Wikipedia

    en.wikipedia.org/wiki/Dimanganese_decacarbonyl

    Dimanganese decacarbonyl, [3] which has the chemical formula Mn 2 (CO) 10, is a binary bimetallic carbonyl complex centered around the first row transition metal manganese.The first reported synthesis of Mn 2 (CO) 10 was in 1954 at Linde Air Products Company and was performed by Brimm, Lynch, and Sesny. [4]

  9. Rebar - Wikipedia

    en.wikipedia.org/wiki/Rebar

    Rebar (short for reinforcement bar or reinforcing bar), known when massed as reinforcing steel or steel reinforcement, [1] is a tension device added to concrete to form reinforced concrete and reinforced masonry structures to strengthen and aid the concrete under tension. Concrete is strong under compression, but has low tensile strength.

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