Developments in cement products
This article needs more work. To help develop this article click 'Edit this article' above.
Contents |
[edit] Introduction
Cement production has experienced significant development since it emerged some 2000 years ago. While the use of cement in concrete has a very long history, the industrial manufacturing of cements did not begin until the middle of 19th century with the development of chute kilns. These were later replaced by rotary kilns as the standard manufacturing equipment.
[edit] Development
While cement production has conventionally focused on Ordinary Portland Cement (OPC) composite and gustboiler slag cements, Portland pozzolanic cements and Portland limestone have also gained prominence, especially in areas where fly-ash or slag are not available.
Because of the global need to reduce CO2 emissions, and the drive for cost reduction, cement companies have attempted to lower the clinker content in their cements, although, there are limits which are given by cement performance. The decreasing of this clinker level in cement products is mainly taken into consideration in relation to the international accessibility of pozzolanic materials of industrial origin and latent hydraulic, a in particular there is a focus on cements products that have a high level of limestone content.This is essentially an extension of the present cement norms.
[edit] The requirement for new technologies
All cement products have to satisfy the basic requirements for strength development, durability, early strength development, cost, workability and environmental performance. Depending on the composition of the cement product, these requirements can be satisfied to different degrees. It lies with producers of these cements to optimise the differences in the types of products, and for the buyer to choose the suitable type for construction.
New cements products are likely to focus on durability capacity such as the penetration of chloride and carbonation resistance.
[edit] Future cements
There are a wide range of cement products available. Celitement for example, is founded on calcium silicate hybrid phases. Production is achieved by hydro-thermal mixture and by the reactive milling of lime in a silicon constituent. The Ca/Si ratio is lower when compared to OPC clinker, subsequently CO2 emissions and energy consumption might also be lower. However, it is presently too early to predict the future potential of these cements with respect to the production cost, strength or the practical potential for substitution of traditional cements.
Mark Long
[edit] Find out more
[edit] Related articles on Designing Buildings Wiki
- Aggregate.
- Alkali-aggregate reaction (AAR).
- Applications, performance characteristics and environmental benefits of alkali-activated binder concretes.
- Cement.
- Cement in Saudi Arabia.
- Coal ash.
- Concrete.
- Concreting plant.
- Efflorescence.
- High alumina cement.
- Material Flow Analysis: A tool for sustainable aggregate sourcing.
- Mortar.
- Rendering.
- Research on novel cements to reduce CO2 emissions.
- Screed.
- Stucco.
Featured articles and news
The benefits of writing articles for your organisation
How to create a profile for your organisation and publish for free.
No Falls Week. The importance of safe working at height
What to expect and what is on offer to avoid accidents.
Scottish Government action to reach net-zero targets
Retrofit expert group highlight critical actions needed.
A forward thinking, inclusive global community of members.
From engineered product life-spans, to their extension.
Circular economy in the built environment
A brief description from 2021. Where are we now?
Mental Health Awareness Week with ABS
Architects Benevolent Society programme of activity.
CLC publishes domestic retrofit competency framework
Roadmap of Skills for net zero.
May 13-19: Moving more for our mental health.
Understanding is key to conservation.
Open industry engagement survey seeks responses
Institutions and the importance of engagement.
National Retrofit Hub unveils new guide
Digital Building Logbooks and Retrofit: An Introduction.
Enhancing construction site reporting efficiency
Through digitisation and the digital revolution.
Noise in the built environment
BSRIA guide TG 20/2021.
17,000 people suffer conditions as a result of exposure to excessive noise at work.
Turning down the noise: Auditory health
A pervasive risk with far-reaching consequences.
Getting the most out of heat pumps and heating
How heat pumps work and how they work best.
Electrotechnical excellence, now open for entries.