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  2. Crack spacing of reinforced concrete - Wikipedia

    en.wikipedia.org/wiki/Crack_spacing_of...

    Primary cracks (Figure 1) form when the tensile stress at the outer surface of the concrete reaches the tensile strength of concrete. When a primary crack forms, the concrete in the vicinity of the crack is relieved of any tension, resulting in a stress free zone near the crack.

  3. Properties of concrete - Wikipedia

    en.wikipedia.org/wiki/Properties_of_concrete

    All concrete structures will crack to some extent, due to shrinkage and tension. Concrete which is subjected to long-duration forces is prone to creep. The density of concrete varies, but is around 2,400 kilograms per cubic metre (150 lb/cu ft). [1] Reinforced concrete is the most common form of concrete.

  4. Prestressed concrete - Wikipedia

    en.wikipedia.org/wiki/Prestressed_concrete

    With the tendons fixed to the concrete at each side of the crack, greater resistance to crack expansion is offered than with unbonded tendons, allowing many design codes to specify reduced reinforcement requirements for bonded post-tensioning. [10]: 4 [11]: 1 Improved fire performance.

  5. Road - Wikipedia

    en.wikipedia.org/wiki/Road

    The technique restores support to concrete slabs by filing small voids that develop underneath the concrete slab at joints, cracks or the pavement edge. The process consists of pumping a cementitious grout or polyurethane mixture through holes drilled through the slab. The grout can fill small voids beneath the slab and/or sub-base.

  6. Gay couple who showed off picture-perfect family get 100 ...

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    A gay Georgia couple convicted of sickening sexually abuse of their two adopted sons will spend the rest of the lives behind bars.. William and Zachary Zulock, 34 and 36, were each sentenced last ...

  7. Ballastless track - Wikipedia

    en.wikipedia.org/wiki/Ballastless_track

    Slab track with flexible noise-reducing rail fixings, built by German company Max Bögl, on the Nürnberg–Ingolstadt high-speed line. A ballastless track or slab track is a type of railway track infrastructure in which the traditional elastic combination of sleepers and ballast is replaced by a rigid construction of concrete or asphalt.

  8. Pistons G Jaden Ivey undergoes surgery to repair broken ...

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    Pistons G Jaden Ivey undergoes surgery to repair broken fibula after collision with Cole Anthony

  9. Prepare for the coldest Arctic blast: How to keep your pipes ...

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    Starting this weekend, millions of Americans across more than a dozens states are expected to feel the coldest and most persistent blast of Arctic air reaching the Central, Southern and Eastern ...