Introduction.

The cement industry is one of the causes of climate change, so research is currently focused on using waste materials that can reduce the amount of raw material that is extracted for manufacturing. As well as it is necessary to evaluate the environmental damage associated with these new products that guarantee in reducing negative effects.

Objective.

evaluate environmental impacts, using life cycle analysis (LCA) based on ISO 14040, caused by a Portland cement production chain with a replacement of 14 % eggshell and 5 % rice husk, maintaining current processes such as grinding and incineration with the same energy consumption.

Materials and methods.

For inventory analysis, account was taken of Agribalyse database v3.0.1, which is the French repository for the analysis of ACV in the agricultural and food sector, these are immersed in the software to be used, which is OpenLCA. For this the cement with percentage of replacement of eggshell (14 %) and rice husk (5 %) is required:

Eggshell and rice husk.

Energy inputs from external systems such as coal and electricity.

Limestone, Sand and Gypsum.

Transport of materials

And they both generate as outputs a Portland cement with replacement of 14 % ESP and 5 % RH (for 1 ton of cement).

Results.

It can be observed that the industry with the greatest contribution to climate change is related to energy production in the form of combustion, which provides a total of 398.10 kg of CO2 equivalent for each ton of cement with replacement of 14 % CH and 5 % AC, this process is related during the production stage in incineration processes. Similarly, the second industry with the most contribution to climate change is the mining industry, which is responsible for the release of 200.10 kg of CO2 equivalent for each ton of this type of cement.

Conclusions.

This study found that the use of replacement of 14 % ESP and 5 % RH in a Portland cement and its incorporation into the current process implies a decrease in all associated environmental impacts. Since, despite new effects associated with rice production, these will always be present because it is a food product of great need that generates a lot of waste by not adequately providing its shell, so adding it together with another waste such as eggshells implies an improvement aimed at the circular economy.