The History of FLY-ASH BRICKS :-
The conversion of waste into a resource material is an age old practice of civilization The fly ash become available in coal based power station on the year U.S.A. R.E. Davis and his associates at UNIVERSITY of California published research details on use of fly ash in cement concrete. The research had established that fly ash possesses pozzolanic properties similar to volcanic ash and deserves to be utilized in lime/cement work and in the presence of moisture chemically react with calcium hydroxide at different temperatures to form compounds possessing “Cementitious Properties”. Over a period of time, advancement in technology for combustion process of coal collection process of FLY ASH have taken place resulting significant improvement in quality of FLY ASH. The Research and Development had also established that it has geotechnical properties similar to better than many of the soils being used in conventional burnt clay bricks. The use of FLY ASH has been made mandatory in various forms including making of FLY ASH BRICKS by Minister of Environment & Forest (MOEF) Govt. of India vide gazette notification dated 14th September 1999 where in within 50Km of radius of coal based thermal plants the making and the use of FLY ASH BRICKS has become compulsory and finally again amended in August 2003 by increasing the radius to 100 Km. In view of above notification all construction agencies engaged in building construction within 100KM of any coal based power station to use 100% FLY ASH BRICKS has become mandatory. The reduction in the use of soil in the conventional bricks manufacturing shall have in soil erosion in earth and use of FLY ASH in this as conversion material will help in saving the environment in pollution free atmosphere. It will also save the coal reserves for further.
THE SAILENT FEATURES OF USE OF FLY ASH BRICKS IS DISTINCTIVE IN ENGINEERING ADVANTAGE OVER THE CLAY FIRED RED BRICKS :-
High in Strength/ Less breakage during transit/ construction cost is very low. Uniform in Size Mortars required for joints and plasters is less by almost 30% to 40% Low water absorption Water penetration seepage through Fly Ash Bricks considerably reduced. Plaster Plaster of Paris/Gypsum plaster can direct by be applied on the bricks without backing coat of plaster. Soaking in water Just sprinkling is enough will reduces time and labour. Dead weight The ‘Dead weight’ of Fly Ash brick or less than conventional clay fired bricks, which will result in reduction in structural cost. Cost effective price Fly Ash Bricks are available in competitive price and highly cost effective in totality. Quality Assurance Wet compressive strength Shall not be less than 7.5N/MM2 when tested as per IS:3495 (Part !) 1976. The compressive strength of any individual brick shall not fall below the minimum average compressive strength by more than 20%). Water Absorption The bricks when tested in accordance with procedure laid down in IS:3495 (Part 2) 1976 after immersion in cold water for 24 hrs. Shall have water absorption not more than 20%. Drying Shrinkage The average drying shrinkage of bricks, when tested by the method as per IS:4139-1989 being the average of three units, shall not exceed 0.15 percent. Strength Higher than Conventional clay fired bricks 80-100 Kg/cm2 as against clay fired bricks 20-70 Kg/cm2 Size All Fly Ash Bricks are Uniform in size. Mortar Consumption Use of Mortar is substantially less than on the conventional clay fired bricks. Reference Standard IS 12894:2000
PAVER-BLOCKS :- Also known as brick paving is a commonly used decorative method of creating a pavement or hard standing. The main benefit of bricks over other materials is that individual bricks can later be lifted up and replaced.
Block paving also known as brick paving is a commonly used decorative method of creating a pavement or hard standing. The main benefit of bricks over other materials is that individual bricks can later be lifted up and replaced. This allows for remedial work to be carried out under the surface of the paving without leaving a lasting mark once the paving bricks have been replaced. Typical areas of use would be for driveways, pavement, patios, town centres, precincts and more commonly in road surfacing. Bricks are typically made of concrete or clay, though other composite materials are also used. Each has its own means of construction. The biggest difference is the way they set hard ready for use. A clay brick has to be fired in a kiln to bake the brick hard. A concrete brick has to be allowed to set. The concrete paving bricks are a porous form of brick formed by mixing small stone hardcore, dyes, cement and sand and other materials in various amounts. Many block paving manufacturing methods are now allowing the use of recycled materials in the construction of the paving bricks such as crushed glass and crushed old building rubble.
Common Block Paving Patterns
There are many different laying patterns that can be achieved using block paving. The most common of these is the herringbone pattern. This pattern is the strongest of the block paving bonds as it offers the most interlock, therefore making it a good choice for driveways and road surfacing. A herringbone pattern can be created by setting the blocks at either 45 degrees or 90 degrees to the perpendicular. Other popular types of pattern include stretcher bond and basketweave; with the latter being better suited to paved areas that will only receive light foot traffic, due to its weaker bond.
Pavers manufactured from concrete go well with flag, brick and concrete walkways or patios. If you reside in climates wherever winter temperatures dip below zero, concrete pavers are an honest selection. They are ready to stoppage well in extreme temperatures. Opt for pavers in shades like ochre, pink, bisque, white or sand. Pavers are available in hole, x-shape, y-shape, pentagon, polygon and fan styles.