As we know, 1kg of cement production produces about 0.8–0.9 kg of CO2 and other greenhouse gases. Many studies have been done on the partial replacement of cement with ash from different waste materials, i.e., rice husk ash, fly ash, coconut shell ash, water hyacinth, bamboo leaf ash, sugarcane bagasse ash, and many more. The burning of these materials will also produce CO2. Everyone is mentioning in their paper that it reduced CO2 emissions, but I did not find it in numbers.
You are correct that the production of Portland cement is responsible for significant CO2 emissions, with approximately 0.8–0.9 kg of CO2 emitted per kg of cement produced. The use of waste materials as partial replacements for cement, such as rice husk ash, fly ash, coconut shell ash, water hyacinth ash, bamboo leaf ash, and sugarcane bagasse ash, has been studied as a means to reduce these emissions. While the burning of these waste materials does produce CO2, the overall emissions tend to be lower than those associated with traditional cement production.
Quantifying the exact reduction in CO2 emissions from using these waste materials as cement replacements can be challenging due to several factors, including:
In many cases, the focus of research papers is on the mechanical properties and durability of concrete made with these alternative materials, rather than providing exact numbers for CO2 emissions reductions. However, it is generally accepted that utilizing waste materials as partial cement replacements can lead to a reduction in overall CO2 emissions, as these materials often have lower carbon footprints compared to traditional Portland cement production.
To obtain more specific numbers on CO2 emissions reductions, you may need to look for studies that have conducted life-cycle assessments (LCAs) for concrete made with these waste materials, as these assessments consider all aspects of production, including CO2 emissions.
I hope this helps!
Niroj Aryal
You are correct that the production of cement is associated with significant greenhouse gas emissions, primarily carbon dioxide (CO2). Therefore, research has focused on finding alternative materials that can partially replace cement in construction while reducing CO2 emissions.
One of the common alternatives to cement is the use of ash from waste materials, such as rice husk, fly ash, and sugarcane bagasse ash. While the use of these materials can reduce CO2 emissions compared to cement production, it is important to consider the emissions associated with the production of the ash itself.
The amount of CO2 emissions saved by using ash as a partial replacement for cement will depend on several factors, including the type of waste material used, the ash production process, and the percentage of cement replaced. Therefore, it is difficult to provide a specific number for the CO2 emissions saved without considering these factors.
However, many studies have attempted to quantify the reduction in CO2 emissions associated with the use of ash as a partial replacement for cement. For example, a study published in the Journal of Cleaner Production in 2020 found that the use of sugarcane bagasse ash as a partial replacement for cement reduced CO2 emissions by up to 12%. Another study published in the same journal in 2019 found that the use of rice husk ash as a partial replacement for cement reduced CO2 emissions by up to 11%.
While the reduction in CO2 emissions may vary depending on the specific circumstances, these studies suggest that the use of ash as a partial replacement for cement can be an effective way to reduce greenhouse gas emissions in construction.
Marwan Hany sir could you please send me the journal link as I did not find any paper and the value you have mentioned here? I think you have used chatGPT to answer this question. chatGPT is not always right sir.
Cement raw materials are rare to find in nature with production cost high than waste organic materials so replacement of organic waste with cement will result to decrease of atmospheric CO2 and decrease in Oxygen which is a product of photosynthesis.
yeah, Peter Oko Ogbaji but the thing is we should also know about how much environmental impact(CO2 emission) is created while using the waste materials.
- Badges
- Science topic
- Similar topics
- Physics
- Condensed Matter Physics
- Solid State Physics
- PEAKS