Low-C bricks: Researchers have developed a technology to produce energy-efficient walling materials using construction and demolition waste (CDW) and alkali-activated binders.
- Scientists of the Indian Institute of Science developed a technology for producing alkali-activated bricks/blocks by utilizing fly ash and furnace slag.
- These are called low carbon bricks.
- These bricks do not require high-temperature firing and avoid the use of high-energy material such as Portland cement.
- The technology will also solve the disposal problems associated with construction and demolition waste mitigation.
- The researchers developed low embodied carbon bricks from construction and demolition waste through an alkali activation process using fly ash and ground slag and characterizing the thermal, structural, and durability characteristics of Low-C bricks and their masonry.
Conventionally, building envelopes consist of masonry walls built with burnt clay bricks, concrete blocks, hollow clay blocks, fly ash bricks and lightweight blocks.
What is fly ash?
- Fly ash is a fine powder that is a byproduct of burning pulverized coal in electric generation power plants.
- Fly ash or flue ash, coal ash is also known as pulverized fuel ash in the United Kingdom, or coal combustion residuals (CCRs).
- When mixed with lime and water, fly ash forms a compound similar to Portland cement.
- It is used in concrete and cement products, road base, metal recovery, and mineral filler among others.
- However, these particles are toxic air pollutants as they can trigger heart disease, cancer, respiratory diseases and stroke.