Location
Grand Rapids, Michigan
Start Date
14-5-2024 11:00 AM
End Date
14-5-2024 11:30 AM
Description
The dominance of coal as the power source for electricity is reducing worldwide and in some countries has been fully phased out, par�cularly in western Europe. Over the next 20 years or so most countries will fully adopt renewable energy. This will mean that, other then recovered material, the availability of run-of-sta�on fly ash will be significant reduced. In the UK, the Low Carbon Concrete Group of The Green Construc�on Board has published the Low Carbon Concrete Routemap, which describes the path to net zero by 2050. This has iden�fied that calcined clay could be a large volume raw material to produce low carbon cement (and an embodied CO2 around a third that of Portland cement clinker). This paper will report on the performance of a range of calcined clay cements produced at industrial- scale rotary and flash calciners using overburden and interburden waste clays from exis�ng Portland cement plants. A wide range of structural concretes were assessed and it will be demonstrated that calcined clays of this type are highly pozzolanically-reac�ve and can produce very high compressive strengths and excep�onal chloride resistance. The paper will also consider carbona�on, which given pozzolanicity of Calcined Clays, can be higher than ‘conven�onal normal concrete’.
Document Type
Event
Calcined Clay Cement: The New Fly Ash for Low Carbon Concrete?
Grand Rapids, Michigan
The dominance of coal as the power source for electricity is reducing worldwide and in some countries has been fully phased out, par�cularly in western Europe. Over the next 20 years or so most countries will fully adopt renewable energy. This will mean that, other then recovered material, the availability of run-of-sta�on fly ash will be significant reduced. In the UK, the Low Carbon Concrete Group of The Green Construc�on Board has published the Low Carbon Concrete Routemap, which describes the path to net zero by 2050. This has iden�fied that calcined clay could be a large volume raw material to produce low carbon cement (and an embodied CO2 around a third that of Portland cement clinker). This paper will report on the performance of a range of calcined clay cements produced at industrial- scale rotary and flash calciners using overburden and interburden waste clays from exis�ng Portland cement plants. A wide range of structural concretes were assessed and it will be demonstrated that calcined clays of this type are highly pozzolanically-reac�ve and can produce very high compressive strengths and excep�onal chloride resistance. The paper will also consider carbona�on, which given pozzolanicity of Calcined Clays, can be higher than ‘conven�onal normal concrete’.
