EN

Glossary

  • A

    Additive for concrete
    Concrete additives are powdery, granular or liquid substances added to concrete in order to influence certain properties of the concrete, e.g. its strength. By adding Photoment®, the surface strength can be increased by as much as 30 percent.

  • B

    No entries available

  • C

    Color retention
    Color retention means the durability of a color, e.g. of concrete paving stones. If color retention is insufficient, colored paving blocks may after some time attain a grayish appearance resulting from the gray color of the cement. Photoment® has been shown to be effective also in colored concrete paving stones. Studies have confirmed that Photoment® has no adverse effect on color retention.

    Concrete
    Concrete is a mixture of a binder (normally cement produced from limestone and clay as raw materials), aggregate (sand, gravel), water and, as the case may be, additives (e.g. fly ash). Photoment® is a photocatalytically active additive for concrete.

    Concrete paving blocks
    Concrete paving blocks are used for surfacing roads, streets and footpaths. They are industrially manufactured of a mixture of cement, aggregate and water. Photoment® is a photocatalytically active additive for concrete which can be used in the manufacture of concrete paving blocks. 

  • D

    No entries available

  • E

    ENVI-met
    ENVImet is a three-dimensional, non-steady fluid dynamic and thermodynamic model used for calculating the microclimate and the dispersion of airborne pollutants in urban environments. ENVI-met andalyses and tests on 1,500 block specimen have confirmed the effectiveness of Photoment®

  • F

    Fine dust (respiratory dust, breathable dust)
    Fine dust, also referred to as respiratory or breathable dust, consists of very small particles that pose a hazard to health; the particles are emitted from combustion processes (primary formation) or formed in subsequent processes occurring in the atmosphere (secondary formation). Primary fine dust results from the emission of motor vehicles and is thus released at the source. Secondary fine dust, in contrast, results from chemical reactions in the atmosphere in which gaseous precursor substances (e.g. nitrogen oxides) are involved. Photoment® influences this process at an early stage and thereby contributes to improving the quality of air and life. The photocatalytic reaction triggered by Photoment® decomposes nitrogen oxides.

    Freeze-thaw and de-icing salt resistance
    Freeze-thaw and de-icing salt resistance means the resistance of concrete against freeze-thaw cycles and de-icing salt. If water penetrates into the concrete and then freezes, the expansion of water due to freezing can damage the concrete. Use of de-icing salt on roads aggravates this detrimental effect. Insufficient freeze-thaw and de-icing salt resistance can thus result in spalling of material from the concrete surface. Concrete blocks with Photoment® fully satisfy the freeze-thaw and de-icing salt resistance requirements.

  • G

    No entries available

  • H

    Hydrophobic surfaces
    A surface is described as "hydrophobic" or "water repellent" if the contact angle between a drop of water and the surface is greater than 90°. On a hydrophobic surface, drops of water retain their spherical shape which makes it difficult for them to undermine dirt particles adhereing to the surface. If Photoment® is used in concrete blocks, the block surface is rendered "superhydrophilic" which causes the water to lose its drop shape and spread out over the surface, so dirt particles can be undermined and flushed off more easily.

  • I

    No entries available

  • K

    No entries available

  • L

    Light
    Light does not only refer to that part of electromagnetic radiation that can be seen with human eye, sondern but also to the adjacent (non-visible) wavelength ranges of infrared and ultraviolet radiation. On a Photoment® surface, light triggers a photocatalytic reaction. It is one of the strong points of Photoment® that is also effective when exposed to artificial light and/or visible light.

  • N

    No entries available

  • O

    Ozone
    Ozone is a harmful, almost colorless gas which is formed in the higher strata of atmosphere (ozone layer), where it protects the earth from the sun's ultraviolet radiation. As a result of photochemical processes occurring in the presence of sunlight, precursor pollutants, e.g. nitrogen oxides can be converted to ozone also in the ground level layers of the atmosphere. The photocatalytic reaction on Photoment® surfaces reduces the nitrogen oxide concentration which helps to improve the quality of air and life.

  • P

    Photocatalysis
    When exposed to sunlight, photocatalysts (usually in the form of titanium dioxide (TiO2)) trigger a chemical reaction. This reaction decomposes pollutants and helps to keep surfaces cleaner. Photoment® is a photocatalytically active construction material. When exposed to light, a photocatalytic reaction is triggered on a surface containing Photoment®. In this reaction, harmful nitrogen oxides(NOx) are converted to nitrate (NO3-).

  • Q

    No entries available

  • R

    No entries available

  • S

    Self-cleaning
    Surfaces upgraded with Photoment® clean themselves and stay clean for longer. The photocatalytic reaction on a Photoment® surface impedes the growth of organic substances such as algae, mosses, lichens or fungi. In addition, the surface is rendered superhydrophilic, which permits dew or rainwater to spread out over the surface. Dirt particles and organic substance are undermined and washed off by the next rainfall.

    Superhydrophilic surface
    A surface is described as "superhydrophilic" if the contact angle between a drop of water and the surface is smaller than 10°. Dew and rainwater spread out over the surface and undermine dirt particles and organic substances which are then easily washed away by the next rainfall. If exposed to light, a Photoment® containing surface becomes hydrophilic.

  • T

    Titanium dioxide
    Titanium dioxide (TiO2) is widely used as a white pigment in paints, plastics and other materials. In Photoment® titanium dioxide is used as a photocatalyst.

  • U

    No entries available

  • V

    No entries available

  • W

    White Topping
    White Topping is a road pavement of asphalt and concrete which is used to refurbish damages asphalt pavements. Pavement toppings are prospective fields of application of Photoment®.

  • Z

    No entries available