Cement, a dry powder, is the binding component of concrete. Concrete is the second-most used material on earth after water, and cement/concrete production is directly responsible for 5-10% of the world’s man-made carbon dioxide (CO2) emissions.
Portland cement, also known as OPC, is the most common type of cement. It contains three main ingredients: Calcium Oxide (CaO), Silicon Dioxide (SiO2) and Aluminium Oxide (Al2O3).
OPC production is extremely polluting for three main reasons:
- CaO is typically mined from Limestone (CaCO3). An enormous amount of energy is spent
on extracting the limestone from the ground, transporting it, and heating it up to 1350°C,
in order to convert it to CaO.
- When CaCO3 is converted to CaO, 60% of its mass is released into the atmosphere as
carbon dioxide – a potent greenhouse gas.
- The entire process creates airborne pollution in the form of dust emissions, noise and
Thankfully, certain waste materials or by-products from other industrial processes can sometimes possess the three primary components of OPC – CaO, SiO2 and Al2O3. However, these materials are usually inert, meaning they do not react easily, thus presenting limited initial usability. Activating these materials so that they may become more reactive and behave like cement is our focus at Naturacem.
The activation of such materials to substitute OPC is not a new phenomenon. Several other companies already utilize Fly Ash (PFA) from coal-fired power plants, or Slag (GGBFS) from blast furnaces as cement replacements. Despite that, these products often require a specific grade & quantity of PFA or GGBFS to make, and need to adhere to a rigid recipe. This disqualifies the use of lower quality substitute materials which are more widely available. To exacerbate the problem, some of these products even appear to have been created simply to satisfy CEM standards, or achieve arbitrary cement replacement percentage targets.
Naturacem employs a tailor-made approach to creating green cement. Unlike competing products, we can customize our formulations to cater to the available waste materials from a particular location, maximizing their usage while minimizing CO2 emissions and cost. This is done using proprietary technology that includes a variety of processes for the assessment of particle aggregates, different techniques for pairing such aggregates with the correct binder
system, and methods to optimize efficiency.
Naturacem cement contains the following benefits:
- Can be tailored to the available waste (including materials of a lower quality)
- Customizable product characteristics, e.g. improved acid resistance & strength
- Low carbon footprint
- Low cost
At Naturacem, we believe that green cement is special, and each individual formulation should be handled uniquely!