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  2. Poly(methyl methacrylate) - Wikipedia

    en.wikipedia.org/wiki/Poly(methyl_methacrylate)

    PMMA ignites at 460 °C (860 °F) and burns, forming carbon dioxide, water, carbon monoxide, and low-molecular-weight compounds, including formaldehyde. [17] PMMA transmits up to 92% of visible light (3 mm (0.12 in) thickness), [18] and gives a reflection of about 4% from each of its surfaces due to its refractive index (1.4905 at 589.3 nm). [3]

  3. Fracture toughness - Wikipedia

    en.wikipedia.org/wiki/Fracture_toughness

    A component's thickness affects the constraint conditions at the tip of a crack with thin ... Concrete: 0.2–1.4 Polymer: Polymethyl methacrylate: 0.7–1.60 ...

  4. Permeable paving - Wikipedia

    en.wikipedia.org/wiki/Permeable_paving

    Permeable pavement surfaces may be composed of; pervious concrete, porous asphalt, paving stones, or interlocking pavers. [1] Unlike traditional impervious paving materials such as concrete and asphalt, permeable paving systems allow stormwater to percolate and infiltrate through the pavement and into the aggregate layers and/or soil below. In ...

  5. Pervious concrete - Wikipedia

    en.wikipedia.org/wiki/Pervious_concrete

    A pervious concrete street in 2005. Pervious concrete (also called porous concrete, permeable concrete, no fines concrete and porous pavement) is a special type of concrete with a high porosity used for concrete flatwork applications that allows water from precipitation and other sources to pass directly through, thereby reducing the runoff from a site and allowing groundwater recharge.

  6. Pavers (flooring) - Wikipedia

    en.wikipedia.org/wiki/Pavers_(flooring)

    Pavers manufactured from concrete go well with flag, brick and concrete walkways or patios. Concrete pavers may be used where winter temperatures dip below freezing. They are available in hole, x-shape, y-shape, pentagon, polygon and fan styles. An interlocking concrete paver, also known as a segmental paver, is a type of paver.

  7. Paver base - Wikipedia

    en.wikipedia.org/wiki/Paver_base

    Paver base is a form of aggregate used in the construction of patios and walkways whose topmost layer consists of mortarless (or "dry-laid") pavers. The first layer in the construction of such a surface is called the subgrade —this is the layer of native material underneath the intended surface.