Products

  • 0
  • 0

Global concrete water reducer market trend 2023-2027 Influences of Concrete Water Reducer on Different Kinds of Cement (2) by Newssunrainey

Russia and Ukraine is an important exporters of oil, natural gas, metals, fertilizers, rare gases and other industrial raw materials. Affected by the further intensification of the tension of the war, the global market has become more worried about the supply of the concrete water reducer, and panic spreads in the futures market. Prices of commodities such as aluminum and nickel are at recent highs on concerns that supplies will fall. Russia accounts for 49 percent of global exports of nickel, 42 percent of palladium, 26 percent of aluminum and 13 percent of platinum, and is a significant exporter of steel and copper. Palladium is an important metal for sensors and memory. In addition, Russia is the world's largest exporter of nitrogen fertilizer, the second largest exporter of potash fertilizer, and the third-largest exporter of phosphate fertilizer. Ukraine is also an important producer of nitrogen fertilizer. Russia's natural gas supply also has a significant impact on the global fertilizer industry and concrete water reducer industry, especially in Europe. The price of the concrete water reducer will also fluctuate to some extent. Russia carries out crude gas separation, and Ukraine is responsible for refined exports. Ukraine supplies 70% of the world's neon, 40% of krypton and 30% of xenon. These three gases are the materials used to make chips.

The water-reducing agent or concrete water reducer is a kind of concrete admixture that can reduce the water consumption under the condition of keeping the slump of concrete basically unchanged. It has a dispersive effect on cement particles, can improve its workability, reduce water consumption per unit, improve the fluidity of concrete mixture, or reduce the amount of cement per unit, saving cement.

 

Because different cement has different mineralized compositions, in addition to the variety of mixed materials, the effect of admixtures for different types of cement is very different.

In this article, we will talk about the problems when water reducer meets different kinds of cement and solutions.

 

2. Low Alkali Sulfur Deficient Cement 

The optimal content of soluble alkali in cement is generally considered to be 0.4-0.6%.  Cement with alkali content less than 0.4% is usually called low alkali cement. And water-soluble alkali exists in sulfate of alkali, so low alkali cement is called lack of sulfur or less sulfur cement. 

When sulfur deficient cement mixes with water-reducing agents, the fluidity is usually poor. Increasing the amount of water-reducing agent may kind of help, but the concrete bleeding will also increase. The uniformity of the concrete is poor, and it has fast slump loss. Therefore, the commonly used water reducing agent is difficult to adapt to the problem, even if the amount of retarding agent doubled also has no effect.

The root cause of the above maladaptive phenomenon of sulfur deficient cement is that SO3 is not enough in cement, which reduces the hydration effect of C3A in cement, and the rapid and large adsorption of C3A on admixtures also reduces the plasticizing function of water-reducing agents. Therefore, only soluble alkali (sulfate) supplement is effective in solving the adaptability problem of cement with low alkali and sulfur deficiency.  But the effect of increasing the amount of retarders is not obvious. 

 

3. Cement with A high C3A Content

The main components of cement are C3S, C2S, C3A, and C4AF. The order of adsorption activity of these mineralized components is generally considered to be C3A>C4AF>C3S>C2S, among which C3A has the largest adsorption amount of water reducer. Therefore, when the content of the water reducer is constant, the fluidity of concrete decreases with the increase of C3A content. The slump time loss rate also increases. This is mainly because the water-reducing agent is mostly adsorbed by C3A, and the main mineralized component C3S is not enough water-reducing agent to adsorb and disperse so the fluidity of cement slurry is reduced. Many tests show that the content of C3A in cement exceeds 8%, which will have an adverse effect on the fluidity of concrete. 

The experiment proves that the water reducing agent with high content of sulfate is effective in supplementing SO3 in the cement slurry. The adsorption hydration of C3A can also be inhibited by the addition of hydroxyl carboxylate retarders, while the effect of retarders such as polyols is not obvious. Low price water reducing agent can also be used and the dosage can be appropriately increased to meet the adsorption of C3A and there are more remaining water-reducing agents to improve the fluidity of mineralized components such as C3S. Because this kind reduces water agent price is cheap, won't increase use cost.

 

4. High Mixing Material Consumption Cement 

At present, fly ash, volcanic ash, slag, and finely ground limestone are more commonly used. These mixtures differ greatly in their activity, water demand, mineralized components, and adsorption properties of admixtures, which affect the adaptability of admixtures to cement.

High-quality fly ash should be highly active (that is, high content of active SiO2 and AL2O3), small loss of combustion, low fineness, and small water demand. The loss of fire has the greatest influence on the solubility of admixture.  

Loss of combustion is the content of unburned carbon in fly ash. The higher the burning loss, the higher the unburned carbon content and the worse the solubility with the admixture. Higher carbon content will deteriorate the performance of concrete. Unburned carbon is porous particles, easy to absorb water, high water demand in concrete, overflow will increase concrete bleeding, and will increase concrete shrinkage deformation, but also affect the bonding performance of cement slurry and aggregate interface. When carbon meets water, a water-repellent film may be formed on the particle surface, which hinders the further infiltration of water and affects the activity of fly ash. The study also found that the carbon in fly ash has a strong adsorption capacity, it will compete with cement adsorption after the addition of a water reducer, affecting the fluidity of cement slurry. 

At present, the common way to solve the solubility of high-temperature loss fly ash, pozzolash cement, and the admixture is to increase the dosage of admixture and mix a certain amount of high-quality air-entraining agent. 

Because slag contains more aluminate, more gypsum setting agent is needed, and slag cement produced by the ordinary Portland cement process is more prone to sulfur deficiency. Therefore, the use of high sulfate content of water reducing agent is more suitable, with high-quality air-entraining agent, small and dense bubbles also have a certain reduction of aluminate adsorption of water reducing agent, but need to increase the dosage. 

 

Suppliers of Concrete Additives

TRUNNANO is a reliable concrete additives supplier with over 12-year experience in nano-building energy conservation and nanotechnology development.

If you are looking for high-quality concrete additives, please feel free to contact us and send an inquiry. (sales@cabr-concrete.com)

We accept payment via Credit Card, T/T, West Union, and Paypal. Trunnano will ship the goods to customers overseas through FedEx, DHL, by air, or by sea.


Researchers at the Centre for Translational Atomic Materials at Swinburne University of Technology, Melbourne, Australia have developed a new graphene film that absorbs more than 90% of sunlight while eliminating most of the infrared thermal emission losses, a highly efficient A solar-heated metamaterial capable of rapidly heating to 83 degrees Celsius (181 degrees Fahrenheit) in an open environment with minimal heat loss. Proposed applications for the film include thermal energy harvesting and storage, solar thermal power generation, and seawater desalination.
Our company provides graphene concrete water reducer, if you need to buy graphene and concrete water reducer, please feel free to contact us.

Inquery us

Our Latest Products

Global early strength agent,superplasticizer for concrete market trend 2024-2026 Difference analysis between early strength agent and superplasticizer for concrete by Newssunrainey

Early strength admixture refers to the admixture that can improve the early strength of concrete and has no significant effect on the later strength.Superplasticizer for concreter is a concrete admixture that can reduce the amount of mixing water whi…

Global Powdered Instant Potassium Silicate market trend 2022-2026 Powdered Instant Potassium Silicate CAS 1312-76-1 Potassium Silicate Powder,99% by Newssunrainey

Koalas were declared endangered in eastern Australia on Friday, with more and more koalas dying from disease, habitat loss, and other threats. Earlier, the koala was considered a vulnerable species, and the Commonwealth Department of the Environment…

Global pce powder market trend 2023-2030 Combine Polycarboxylate Superplasticizer with Early-strength Component by Newssunrainey

With the wide application of polycarboxylate superplasticizer, the requirement of concrete early strength in practical engineering is more and more prominent, so the polycarboxylate superplasticizer has been the focus of research to meet the early st…