Fly ash bricks 195

fly ash brick prasentation

1. SUBMITTED BY : AVINASH JAISWAL [CSJMA14001390195] B.TECH, IV th year [ CHEMICAL ENGINEERING] FLY ASH BRICKS

2. CONTENTS INTRODUCTION CLASSIFICATION OF FLY ASH WHY FLY ASH BRICKS? VARIOUS TYPES OF FLY ASH BRICKS ADVANTAGES OF FLY ASH BRICKS APPLICATIONS REFERENCES 1

3. INTRODUCTION WHAT IS FLY ASH? ash collected from exhaust of power plants before they can fly away. 72% of India’s power plants are coal based. These power stations generate nearly 40 million tones of fly ash annually. Chemically, fly ash is a pozzolan,when mixed with lime (calcium hydroxide), pozzolans combine to form cementitious compounds. 2

4. CLASSIFICATION OF FLY ASH FLY ASH CAN BE CLASSIFIED INTO TWO CLASSES : Class C Class F 3

5. CLASS C P roduced by the burning of lignite or sub bituminous coal Contains more than 20% lime ( CaO ) Self-cementing properties 4

6. CLASS F Produced by burning harder , older anthracite and bituminous coal Contains less than 10% lime ( CaO ) Requires a cementing agent 5

7. WHY FLY ASH BRICKS? Coal ash typically contains heavy metals including arsenic, lead, mercury, chromium as well as alumin i um, chlorine, cobalt and zinc. These toxicants can cause heart damage,lung disease, respiratory distress, kidney disease. 6

8. VARIOUS TYPES OF FLY ASH BRICKS Burnt clay fly ash bricks (BCFB) High ash content BCFB Flux bonded BCFB Fly ash lime gypsum bricks Fly ash cement bricks 7

9. Burnt clay fly ash bricks (BCFB) : Fly ash and local soil are mixed to manufacture BCFB. Upto 40% additional bricks can be made using same amount of soil. MANUFACTURING PROCESS 8 AIR DRYING TIME - 4 to 6 DAYS ASH COMPOSITION - UPTO 60%

10. Flux bonded BCFB : COMPOSITION: Fly ash (about 80%) Soil (about 10%) Flux making additives/Binders Water DRYING TEMPERATURE: 800-1000 C MANUFACTURING PROCESS: 9

11. Fly ash lime gypsum bricks (FAL-G): COMPOSITION: Fly ash (50-65%) Hydrated lime (8-12%) Stone dust (20-30%) Gypsum (5%) MANUFACTURING PROCESS: 10 [1 - 2 DAYS] [15 - 21 DAYS]

12. Fly ash cement bricks : COMPOSITION: Fly ash (50-60%) Stone dust (about 40%) Portland cement (8-10%) MANUFACTURING PROCESS: Same as FAL-G making process. 11

13. ADVANTAGES OF FLY ASH BRICKS NORMAL BRICK S FLY ASH BRICKS Heavier in weight Lighter in weight Plastering required No plastering required Compressive strength is around 35 Kg/cm2 Compressive strength is around 100 Kg/cm2 Thermal conductivity 1.25 – 1.35 W/m2 ºC Thermal conductivity 0.90-1.05 W/m2 ºC Water absorption 20-25% Water absorption 6-12% 12

14. APPLICATIONS CONSTRUCTION OF BUILDING ROAD CONSTRUCTION FLOOR TILES MAKING 13

15. CONCLUSION Electricity is an essential requirement of each society and in INDIA major part of power is produced using coal which produces fly ash. Each one who consumes power has a moral responsibility to contribute for its utilization. Fly ash bricks are environment friendly and can be easily manufactured in factory. There is a need to shift users habit and use fly ash bricks in place of clay bricks. 14

16. REFERENCES http://www.ntpc.co.in http://flyashbricksinfo.com http://buildwithash.com http://www.ecobrick.in 15