Cement production is one of the most energy-intensive and environmentally pollutive processes in the construction industry. Producing one ton of ordinary Portland cement requires vast amounts of limestone, clay, quartz sand, and iron ore. More importantly, it demands a massive amount of fuel (natural gas in Turkmenistan) and energy. During the kiln firing of the raw mix, significant amounts of CO₂, dust, and other harmful substances are released.
Scientists at the Institute of Chemistry of the Academy of Sciences of Turkmenistan, led by Doctor of Technical Sciences Rejepnur Nurberdyev, have spent years researching ways to make cement production cleaner and more affordable without compromising quality. They propose two interconnected strategies.
More Mineral Additives, Less Clinker: Lower Costs and Emissions
The primary and most “expensive” component of cement is clinker. It is produced by firing a raw mix at extremely high temperatures. Clinker production accounts for the lion’s share of raw materials, energy, and fuel consumption, as well as the majority of greenhouse gas emissions.
Turkmen scientists have proposed an innovative solution: replacing a portion of the clinker with active mineral additives (primarily pozzolanic materials). Currently, Turkmenistan produces Portland cement with 20% additives, maintaining high concrete quality. However, researchers have developed a technology that safely increases the proportion of mineral additives to 35%.
What are the benefits of this approach?
- More than 300 kg of clinker saved per ton of finished cement.
- Accordingly, a sharp reduction in raw material consumption and natural gas usage — on average, about 96 m³ of gas was previously spent per ton of cement just for clinker production. Natural gas is the main fuel used at Turkmen cement plants.
- Significant decrease in CO₂ and other greenhouse gas emissions — a crucial factor in the global fight against climate change.
- The quality of the final product does not decline: concrete retains the required strength and actually becomes more resistant to aggressive environments.
The Secret of Strength: Ultra-Fine Grinding
The key secret to preserving cement strength lies in the method of dispersity (fine grinding).
Ordinary coarse-grained cement has limited strength potential. But when both the clinker and mineral additives are carefully ground to very fine particles (down to nano-scale sizes), the following occurs:
- The contact surface area of the particles increases dramatically;
- Their bonding within the cement stone structure improves;
- A denser and stronger framework forms;
- Active silica (SiO₂) from pozzolans (in Turkmenistan, particularly local opoka and basaltic rocks) reacts with calcium hydroxide released during concrete hardening;
- This reaction “binds” the lime, preventing its harmful interaction with aggressive environmental substances.
Result: concrete not only maintains its strength but gains increased durability and resistance to external impacts.
Modernizing Kilns: The Second Path to Efficiency
Since clinker is still required even with additives, the second strategy focuses on making its production more efficient. Turkmen scientists are concentrating on improving the operational and performance metrics of firing kilns to:
- Reduce specific fuel (natural gas) consumption per ton of clinker.
- Increase the stability and quality of the resulting clinker.
- Minimize dust/gas emissions and heat loss.
Enhanced kiln performance improves clinker quality, which in turn amplifies the positive effects of mineral additives and provides additional resource savings.
Cement Production in Turkmenistan
Turkmenistan currently operates five cement plants (two in Baherden, two in Koytendag, and one in Jebel), producing over 3.5 million tons of Grade 500, Grade 400, and other varieties annually. All plants are located away from residential areas and farmland to minimize their impact on people and nature.
With vast raw material reserves and these newly developed technologies, the country is positioned to increase production more sustainably and cost-effectively.
The results of this research have been published in the international scientific journal Bulletin of Syktyvkar University (Natural Sciences series, “Green” Technologies section), confirming their scientific value. Looking ahead, Turkmen chemists intend to further explore the integration of mineral additives and conduct comprehensive quality studies on the resulting products. /// nCa, 4 February 2026 (Based on materials from the “Neutral Turkmenistan” newspaper)