SELF CLEANING CONCRETE Making Materials of Concrete 99883295160 Ali akbar seat

Self-cleaning concrete  Strong sunlight or ultraviolet light decomposes many organic materials in a slow natural process. Photocatalysts accelerate this process, and as a catalyst they stimulate the chemical transformation without being consumed by the reaction.  When used in concrete, photocatalysts decompose organic materials (such as soot, grime and oil), biological materials (such as mould and bacteria) and pollutants (such as volatile organic compounds (VOCs) and tobacco smoke). The catalyzed compounds break down into molecules that are either beneficial to or have a benign impact on the environment. It should be noted, however, that most inorganic pollutants and stains, including rust, are not catalyzed. The primary catalytic ingredient is Titanium oxide (TiO2), which is manipulated to become a semi conductor. The energy in light causes the TiO2 to create a charge separation of electrons, which disperse on the surface of the TiO2 and react with external substances, decomposing organic compounds. 

Photocatalytic concrete is being made with photocatalytic Portland cement, available from the Italcementi Group. Two cements are available TX Active Arca and TX Active Aria both of which are self cleaning, but the latter is also air depolluting.  Uses have included the Jubilee Church in Rome, The Air France Headquarters at Roisyy-Charles de Gaulle International Airport, Paris and Hotel de Police in Bordeaux. Other uses include precast concrete pavers and roadways, putting depollution in close proximity to car exhausts. In Japan, photocatalysts have been popular to remove odours and improve indoor air quality, neutralising VOCs from photocopier toner dust and cleaning chemicals. The white color of photocatalytic concrete also reflects much of the heat from the sun, reducing heat gain, keeping urban areas cooler and reducing air conditioning use.

Cement Constituents  Lime :- 60-67%  Silicon Dioxide :- 17-25%  Aluminum Oxide :- 03-08%  Ferric Oxide :- 0.5 -06%  Magnesium Oxide :- 0.1-04%  Alkalis :- 0.4-1.3%  Sulfur trioxide :- 1.3-03%

Self Cleaning Concrete Properties •Workability • Rheology • Finishability • Compressive Strength • Flexural Strength • Durability • Air Void System • Permeabilit

How it works? • Firstly, a self cleaning effect due to oxidation promoted by sunlight. • Secondly, photo induced hydrophilicity makes it look clean. • Since the pollutant is organic it causing dirt over the surface • It is easily removed by rain fall or manual rinsing.

Procedure to be followed • Light and heat are the main source Procedure to be followed • Light and heat are the main source. • Make sure these hits the concrete. • Automatically the reaction takes place. • Then the gaseous particle break down into dust particle. • Rinse it with water to make it clean.

Process of self cleaning • This self cleaning process can be done by oxidizing the Nox gases into powdered or dust like particle by using the UV rays from the sun as resource by titanium dioxide (Tio2).

The operation of self cleaning concrete • Once the sunlight falls on the building the UV rays of certain range will allowed to fall on the building. • Photocatalytic process Tio2+Nox+sunlight. • the hazardous gas becomes powdery particle & stays over the building like a dust.

After the process • Water plays main role as a source of rain fall or manual cleaning • so clean the concrete with the water • Or otherwise it will be self cleaned by rainfall and makes the building non polluted. Water droplets rinsing the NOx dust.

Normal Concrete Self Cleaning Concrete

Merits of self cleaning concrete • Reduces NOx content in atmosphere • Keeps the concrete young • Depollute other pollutants • Eco friendly • Reduces depletion of ozone layer • Reduces corrosion and patch formation

Conclusion • photocatalytic concrete materials have been used in horizontal and vertical applications. • Inventors are the one who invents and engineers are the one who makes it comfortable to the environment. • Using the articles like self cleaning concrete it is possible. • It is preferable to use self cleaning concrete as an ecofriendly approach.

REFERENCE : www. cement. org>products>selfcleaningconcrete www REFERENCE : www.cement.org>products>selfcleaningconcrete www.citymetric.com>skylines>selfcleaningconcrete www.concrete.org.uk>fingertips www.nicma-journal.in