Fly ash bricks building materials and construction civil. Cseb bricks in general, brick classification, the advantage of. Fly ash bricks are less costly and lighter in weight. Strength and durability of fly ash, cement and gypsum bricks. Compressed at 28 mpa 272 atm and cured for 24 hours in a 66 c steam bath, then toughened with an air entrainment agent, the bricks last for more than 100 freezethaw cycles. Rai 1992 indicated that calcium silicate type bricks using fly ash, sand and lime mixtures can be moulded at high pressures 19mpa. Moreover, fly ash bricks have been produced with a naturally occurring reddish colour similar to that of normal clay bricks. Fly ash bricks manufacturing has become a big money making business in india. They are used as replacement for normal clay bricks and has better properties than it. Fire clay brick has advantages of fireproof and heat insulation. Pdf an architectural study of fly ash researchgate.
In this study, an attempt is made to develop lowcost, light weight nonaerated geopolymer nag block by varying fly ash to ggbs fg with lower concentration of the alkaline solution 1. In average, cement stabilised earth bricks consumed less than 10% of. Fly ash bricks competitive in comparison to the conventional clay bricks and provide enormous indirect benefits. Since this bricks have not been used on large scale for the construction work. Strength of these bricks can be engineered by varying the compositions. For years, fly ash was simply dumped into land fill sites or into massive ponds as a method of disposal. Concrete cores taken from a large experimental blocks made from readymixed high volume fly ash. In this paper author explain about advantages and disadvantages and. Fly ash bricks are used in domestic building in the category of low or middleincome groups mostly have single or two storied dwelling units. Paper on use of fly ash for brick making clayfly ash bricks. Pdf fly ash is a waste product which is generated by factories and thermal. With these benefits it is inevitable that fly ash bricks would soon replace clay. Even, band saws can be used in cutting and alignment of the aac bricks.
The rice paddy milling industries give the byproduct rice husk. Fly ash brick fab is a building material, specifically masonry units, containing class c or class. A new approach to the production of bricks made of 100% fly ash. First class bricks must be homogeneous in texture without showing appreciable sign of efflorescence. What are the advantage and disadvantages of flyash bricks. Due to perfect size savings in cement mortar for making. When mixed with lime and water, fly ash forms a compound similar to portland cement. The advantages of fly ash over brick clays are hughes, 1996. In case of nonmodular size of bricks, frog dimensions shall be the same as for modular size bricks. The price of fire clay brick is not as expensive as that of other fire bricks. Light weight brick is more expensive than fire clay brick. It is somewhat like a glass powder that is fine in nature.
As they are large in size, the advantage is that few joints are there in the constructions. More durable as strength increases with passage of time. Fly ash bricks manufacturing 10 points to consider. Waste and scrap refractory bricks can be made of concrete aggregate. The location helps is acquiring of raw material which is basically fly ash, at a cheaper cost. Pure fly ash and certain amount of mixing water 17. They undergo curing for a minimum of 14 days and are then air dried for 7 days. The bricks shall be uniformly burnt, free from cracks and flaws as black coring, nodules of stone and.
The appearance of fly ash bricks is very attractive due to its pleasing color like cement, uniform size, and smooth finish. Fly ash is used in many countries because of its advantages. Pdf comparative study on fly ash bricks and normal clay bricks. The possibility of fly ash for use as building material was investigated. By using fly ash brick we can reduce cement consumption up to 50 % as these brick walls not required plastering on. Buying tips for bricks before you buy bricks for home, office or any sort of construction follow these tips to ensure quality construction. Fly ash brick with fly ash as the main raw material, mixed with coal gangue cement or clay refractory materials, ingredients, forming, drying and roasting can make full use of industrial waste, saving fuel. As the manufacture of clay fly ash bricks and lime fly ash bricks need higher investment, the manufacture of falg bricks can be well accepted by small scale entrepreneurs. The objective of this paper is to explain about manufacturing of fly ash bricks in present era and advantages of using it as a construction material. Uses, benefits, and drawbacks of fly ash in construction. The bricks are uniform in shape and size, therefore, require less mortar in. In aac bricks it is easy to use ordinary tools for cutting the walls for electrical work, including drilling of holes. Fly ash by mixing efficiently with the concrete mix can replace portland cement that in turn can aid in making big sav.
In the thermal power stations, coal is pulverized into fine powder and pumped into the boiler along with compressed air. Dec 19, 2006 in the past, fly ash produced from coal combustion was simply taken up by flue gases and dispersed into the atmosphere. But it has good scope in future, because this brick is being manufactured from the waste material known as fly ash which generally comes from the industrials waste in mass, manufacturing of this bricks avoid the difficulty of dumping fly ash too. Rice husk ash is used in concrete construction as an alternative of cement.
The new bricks and process have been given the name fly ash bricks. Fly ash bricks and comparison with clay bricks composition. By contrast, portland cement has a very high embodied energy because its production requires a great deal. Jul 17, 2017 fly ash is a byproduct from coalfired power plants that is frequently used as an admixture in concrete to replace a portion of the portland cement. Fly ash bricks in kolkata, west bengal fly ash bricks, fly. This has now been proven and a patent is taken for the manufacture of bricks from fly ash. Due to high strength of fly ash bricks, practically no breakage during transport of fly ash bricks and use. Advantages and disadvantages of fly ash bricks daily civil. Sep 10, 20 fly ash is the powdery residue left over from burning coal to produce electricity. The values of these characteristics for fly ash bricks are excellent and have exceeded those pertaining to clay bricks. Brick pillar to construct the veranda brick pillars are constructed to take the load of the roof of veranda. Fly ash lime bricks are chemically bonded bricks manufactured by utilizing 80 82% of fly ash, which is a major waste byeproduct of pulverised coal fired in thermal power stations, 910% of lime, 910% of sand and 0.
Same number of fly ash bricks will cover more area than clay bricks. Advantages and disadvantage of fly ash bricks online. Fly ash bricks are hitech wellimproved quality bricks used for construction of brick masonry structures. These days, most power plants are required by law to reduce their fly ash emissions to less than 1% of ash produced. Based on this study, it appears that brick specimens incorporating wgs can offer an advantage in sulfate laden environments. Advantages and disadvantages of using fly ash bricks over. Advantages outweigh the disadvantages of using fly ash bricks over clay bricks. Pdf an overview of advantages and disadvantages of.
The lower permeability of fly ash concrete can efficiently reduce the effects of efflorescence. The raw materials are blended in desired proportions in a pan mixer for 45 minutes and compressed. So far, few attempts at manufacturing bricks from more than 80% ash have been made. Fly ash can be a costeffective substitute for portland cement in many markets. The disadvantages of using flyash in bricks include. Rice husk ash in concrete properties, advantages and uses. The types, properties, advantages and uses of rice husk in construction is discussed.
Due to uniform size of fly ash bricks mortar required for joints and plaster requirement reduces almost by 50%. Used clay brick can be used as concrete so that to save a lot of resources. Fly ash brick fab is a building material, specifically masonry units, containing class c or class f fly ash and water. Main advantage is the absence of the competitors in the area, the are has no manufacturers of fly ash bricks. Using fly ash in concrete is environmentally beneficial because it reduces the portland cement a major contributor of co2 required in concrete. Fly ash bricks consume only 65 kg cement for the construction of 1 m. It is considered to be a good alternative to traditional mud bricks since the method of manufacture of fly ash is energy efficient that is it helps save energy, brings about reduction of mercury pollution and plus it is cost effective. This created significant environmental concerns and health risks. One of the drawbacks using earth alone as a material for construction is its. There are also some disadvantages of using fly ash in concrete. Fly ash is the residue that is left from burning coal. The ancient greeks, then romans, discovered that ash from volcanos could be mixed with lime and water to produce mortar and concrete. Since the concentration of calcium oxide is very high in class c fly ash, the brick is described as self cementing.
Apr 17, 2015 hence, large amount of fly ash is produced. Pdf fly ash is waste generated from combustion of coal in power generation plants. Since 60% of countrys electricity comes from coal based power station, the country has a huge stock of fly ash amounting to 60 million tones annually. Pdf strength and durability of fly ash, cement and gypsum bricks. Land is available in cast and abundance and with government help, the task gets easier. Due to the increasing rate of environmental pollution and the consideration of sustainability factor have made the idea. Mar 02, 2009 price profit ratio fal g bricks with cement 2. Use of fly ash bricks in this type of construction is meant mainly to achieve economy and make profits. Now people of india have slowly adapting the green brick technology fly ash bricks which is going to be a savior of our mother nature for years to come. With reference to fly ash bricks, the cellular light weight biobriquette ash bricks were found 43 % light in weight, having % higher compressive strength and resulted in 66 % lesser thermal.
The advantages of using fly ash in concrete include the followings. Fly ash is also recognized as an environmentally friendly material because it is a byproduct and has low embodied energy, the measure of how much energy is consumed in producing and shipping a building material. Fly ash is a pozzolan, a substance containing aluminous and siliceous material that forms cement in the presence of water. Fly ash in concrete a literature study of the advantages and. One of the important advantages with fly ash concrete is the resistance to alkali aggregate reaction aar. A new approach to the production of bricks was carried out by using 100% lignite fly ash.