Sustainable concrete is concrete produced and used in ways that minimize CO₂ emissions, reduce cement content, and extend service life without compromising strength or durability. The three levers that matter most: supplementary cementitious materials (SCMs), AI-driven mix optimization, and non-destructive testing that eliminates concrete waste.
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How Does Concrete Impact the Environment?
You have probably noticed that we are big fans of concrete here at Giatec. It is an amazing, durable, and cost-effective material used around the world. In fact, concrete is the second most used material after water! Still, we are aware that no building material is perfect, and it is becoming increasingly important to understand how concrete contributes to important issues like climate change. In this blog, learn all about sustainable concrete and how it revolutionizes the concrete industry.
One of the most important elements in a concrete mix design is cement. When mixed with water, this ingredient binds the mix and allows concrete to set, harden, and gain strength. However, there is one problem with the production of this essential element: it emits CO₂. Cement is produced with limestone, which must be heated at a high temperature (around 2,700 °F or 1,500 °C). The heating process “causes the limestone to chemically decompose, leaving behind a compound called calcium oxide, which is used in the final cement product, releasing carbon dioxide gas into the atmosphere” according to this Scientific American article. As the global population and urbanization grow, so does cement production. Today, the process is responsible for around 8% of global CO₂ emissions (World Economic Forum). To visualize the impact in another way, for every kilogram of cement produced, .81 kilograms of CO₂ is emitted.
How Does Concrete Testing Affect Sustainability?
Testing concrete strength is mandatory for concrete construction. Without these tests, there are risks of concrete cracks and loss of structural integrity, which can reduce the service life of a building. Concrete cylinder break tests have been the traditional method in the construction industry for many years. This method tests field-cured or standard-cured cylinders by placing the samples in a hydraulic compression testing machine and allowing the machine to compress the sample until it splinters or breaks. The problem with this is clear: it produces a lot of concrete waste. It also usually requires trips to a lab, further adding to the project’s environmental impact. You can read more about third-party cylinder testing to learn more about this process.
You might be thinking this is a hopeless issue, but do not worry, it’s definitely not! There are a number of solutions that are beginning to materialize, making concrete much safer for the environment.
What is Sustainable Concrete?
There are a few different ideas about how we can create more sustainable concrete. Sustainable concrete construction should have a minimal total environmental impact, and be durable. In 1987, the Brundtland Commission Report defined sustainability as “development that meets the needs of the present without compromising the ability of future generations to meet their own needs.”
One solution is to increasingly replace the portion of cement with supplementary cementitious materials (SCMs). These materials are often already in your concrete mix and may include fly ash, slag cement, and silica fume. It is important to make use of these materials, as they are by-products from other industries that may otherwise go to waste. By replacing more of your cement with SCMs, you can reduce the overall amount of cement in a mix. Therefore, this reduces the level of CO₂ emissions. In addition to the sustainability benefits, these unique materials can improve workability, flexural and compressive strength, resistance to chlorides and sulfates, and decreased permeability (Lafarge). However, one drawback to using SCMs is that it can slow down your setting time and strength gain of the concrete element (ASCC Education, Research & Development Foundation).
The Importance of Research
In order to achieve sustainable concrete, we need research, awareness, and the companies that use or produce cement need to work towards the same goal. One organization that is helping the cause is the Global Cement and Concrete Association (GCCA). They have an impressive goal of delivering society carbon-neutral concrete by 2050. Over the past 20 years, they have already achieved a 19.2% reduction in CO₂ emissions per tonne of cementitious material. Here’s how they will continue to work towards carbon-neutral concrete:
Finally, it is important to remember that concrete already has sustainable properties, especially when compared to other building materials. Here are just a few benefits of concrete to keep in mind:
- Excellent thermal insulation properties, which reduce electricity and heat production.
- Long service life. This means that buildings can be restored and repurposed instead of being torn down and rebuilt.
- Concrete mixes use industrial waste like fly ash, which is a by-product of coal production. These materials may end up going to waste otherwise.
- It naturally absorbs carbon dioxide over the course of its (long) service life (Scientific American).
These benefits show that concrete is still a very valuable material, even in terms of sustainability. It is also important to note that there is no other option available to meet the requirements and demand for building material. Click here for more information about the benefits of concrete!
How Does Giatec Make Concrete More Sustainable?
Now that you have an idea of how concrete impacts the environment and what can be done to help, you may be wondering what our team is doing to make concrete environmentally friendly. Here at Giatec, we are passionate about fighting climate change, this issue drives the development of our products.
First, Roxi™, our AI-powered concrete assistant, evaluates every mix design against its target strength requirements. Because concrete mixes are typically over-designed and use more cement than necessary, Roxi analyzes your mix and suggests how much cement you can safely reduce without compromising strength. Less cement means less CO₂. That’s the largest sustainability lever available to a ready-mix producer today.
Second, SmartRock® sensors and the maturity method eliminate the need for many concrete cylinder break tests, significantly reducing concrete waste and cutting the trips-to-lab that add fuel emissions to every project. Real-time strength and temperature data on the jobsite also helps confirm your concrete is curing properly, extending service life.
Revolutionizing the Industry
These are just a few ways we are helping our partners, clients, and customers improve the sustainability of their concrete. Sustainable concrete is a major part of our vision to revolutionize the concrete industry, and our team will continue to work hard to reach this goal!
Frequently Asked Questions
What makes concrete sustainable?
Concrete is sustainable when it uses less cement per cubic yard, replaces cement with supplementary cementitious materials (SCMs) like fly ash and slag, and lasts long enough that its long service life offsets the emissions from producing it. AI-optimized mix designs and non-destructive testing methods (like the maturity method) both reduce cement content and cut waste.
How much CO₂ does cement production produce?
What are supplementary cementitious materials (SCMs)?
SCMs are industrial by-products used to partially replace cement in concrete mixes. The three most common are fly ash (from coal-fired power plants), slag cement (from steel production), and silica fume (from silicon metal production). Because they’re by-products of other industries, using them in concrete keeps them out of landfills and reduces the amount of cement needed to bind the mix, cutting CO₂ emissions.
Can you reduce cement without losing strength?
Yes. Most ready-mix concrete is over-designed to hit target strength with a safety margin, which means it contains more cement than the design actually requires. AI-based mix optimization tools like Roxi™ analyze historical mix performance and suggest safe cement reductions that hit the same target strength. Producers using this approach typically reduce cement content by 5–15% without compromising performance.
Is concrete more sustainable than steel or wood?
It depends on the application and the timeframe. Concrete has excellent thermal mass, a long service life, and naturally reabsorbs CO₂ over decades through carbonation. Steel has higher embodied carbon per ton but is highly recyclable. Mass timber has low embodied carbon but requires forest management to remain sustainable. For most structural applications with a long design life, optimized concrete mixes are competitive with or better than the alternatives on a whole-life basis.
Sources
Cement and concrete as an engineering material: An historic appraisal and case study analysis
ASCC Education, Research & Development Foundation
**Editor’s Note: This post was originally published in October 2020 and was updated for accuracy and comprehensiveness in July 2026.
