Brazil: Votorantim Cimentos said that the proportion of alternative raw materials used in Brazilian cement is one of the best in the world, according to data from the Brazilian construction industry association SNIC. In 2013, 91% of all the cement commercialised in Brazil had some additive in addition to the clinker derived from limestone used in cement production.
"Brazil has one of the highest clinker substitution rates in the world. This is due to industry research and the development of technologies to incorporate natural substitutes and even steel industry rejects into cement manufacture", said Edvaldo Rabelo, executive director of energy, sustainability and safety for Votorantim Cimentos. "The addition of alternative raw materials ensures a product as strong and durable as cement made with pure clinker and generates gains such as reductions in gas emissions, water consumption and the burning of fossil fuels in the production process."
Votorantim Cimentos Research and Development manager, Silvia Vieira, said that the company plant in Porto Velho, Rondônia is considered a model in climate change initiatives. In operation since 2009, the plant saw alternative raw materials as a means of reducing operational costs. Located in the north of Brazil, there is a lack of limestone for clinker production and the high cost of transporting it from other mines is prohibitive. "This led us to think about producing calcined clay pozzolan at the plant and increasing the proportion of substitutes. After research, the involvement of scientists to establish technical specifications and diverse tests, we developed our own furnace for producing the material," said Silvia.