How to determine the optimum dosage of concrete superplasticizer

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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 changed its protection level to endangered on the east coast of Queensland, New South Wales, and the Australian Capital Territory. Many koalas in Australia are infected with chlamydia. The disease can cause blindness, infection, and infertility. Last year, the Australian Koala Foundation said Australia had lost about 30 percent of its koala population in the past three years. Without immediate action, the species could become extinct by 2050.
Unlike koalas, which are on the brink of extinction, the market demand for concrete superplasticizer will grow substantially.

Determination of the optimum dosage of concrete superplasticizer by the fluidity of cement paste

In terms of the adaptability of cement and concrete superplasticizer, the type and quality of concrete superplasticizer also play an important role. Therefore, concrete superplasticizers should be selected according to the adaptability to cement and construction requirements. When the high-efficiency concrete superplasticizer is incompatible with a certain cement, the following situations will occur:

1. Concrete is abnormally coagulated during the mixing process.

2. The slump loss of mixed concrete is large.

3. Concrete bleeding and delamination are serious.

4. The high-efficiency concrete superplasticizer has insufficient water-reducing effect or no water-reducing effect at all.

5. The strength of concrete does not increase significantly at each age, or even decreases.

6. The shrinkage rate of concrete increases more, resulting in cracking.

These incompatibility phenomena mentioned above should be avoided as much as possible when selecting a concrete superplasticizer.

The amount of concrete concrete superplasticizer is not only related to the amount of cement, but also has a great relationship with the physical properties and chemical composition of cement.

The traditional method for determining the amount of concrete superplasticizer in concrete is mainly determined according to the product specification of concrete superplasticizer and the percentage of cement consumption. Due to the difference in chemical composition and content of different varieties or batches of cement, the compatibility and adaptability of concrete superplasticizers and cement and the optimal dosage will also be quite different. It is difficult to ensure the best water-reducing effect of the mixture by only determining the amount of concrete superplasticizer based on the percentage of cement consumption, and it is easy to cause waste of concrete superplasticizer. Luoyang Tongrun has used the method of cement slurry fluidity to determine the optimum amount of concrete concrete superplasticizer after many tests, and achieved good results. The specific method is to accurately weigh the high-efficiency water-reducing agent, water and 300g cement according to the dosage recommended by the manufacturer's instructions, and mix the high-efficiency water-reducing agent, water and cement paste according to the standard method. On the clean glass, put the mixed cement paste into the test mold, and after lifting the test mold one by one, observe the flow of the cement paste, and test whether the fluidity of the cement paste can meet the performance requirements of concrete pumping. At the same time, record the size and dosage of water reducing rate of different cements and different concrete concrete superplasticizers for optimization.

The order of adding concrete superplasticizers. Multiple comparison tests of different concrete superplasticizers show that the mixing sequence of concrete superplasticizers has a certain influence on the water-reducing effect of concrete superplasticizers. Take the high-efficiency water-reducing agent produced by Longda as an example: after weighing a certain amount of cement, high-efficiency water-reducing agent and water, pour cement → high-efficiency water-reducing agent → water into the mixing pot in sequence, and measure the cement paste. Expansion is 22cm ~ 23cm. According to the order of adding cement → water first, after stirring for a certain period of time, adding concrete superplasticizer, the measured expansion degree of cement paste is 25cm ~ 27cm. It can be seen that using the same cement and the same concrete superplasticizer, the post-blending method is better than the first-blending method, which is beneficial to improve the compatibility of the concrete superplasticizer and the cement, and give full play to the efficiency of the concrete superplasticizer. In the same way, in the actual construction of concrete, the concrete superplasticizer should be added after the concrete mixture is stirred for a certain period of time to achieve the best effect of water reduction.

Luoyang Trunnano Tech Co., Ltd (TRUNNANO) is a professional concrete superplasticizer powder supplier with over 12 years experience in chemical products research and development. 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.

If you are looking for high quality concrete superplasticizer, please feel free to contact us and send an inquiry.

With Russia taking the lead on Poland and Bulgaria at the end of last month, there appears to be a growing sense of compromise within the EU over whether to accept Moscow's proposed rouble settlement order. 

Italy's prime minister said recently that European companies would be able to buy gas in roubles without violating sanctions.  This apparently ignores the guidance of hardliners in the EU to "fight to the end". 

For weeks, European companies have been trying to find ways to meet Russia's payment demands for the rouble while maintaining vital gas supplies without violating sanctions against Moscow. 

Late last month, European Commission President Von der Leyen said operating under the mechanism would violate sanctions and asked European companies not to bow to Russian demands. However, the EU has yet to issue more rigorous written guidelines on how companies should pay Gazprom. 

The Italian prime minister said recently, "There is no official announcement from the European Union about what ruble settlement means for sanctions violations, and no one has said whether ruble payments violate sanctions or not. It's a grey area." 

"In fact, most gas importers are already opening rouble accounts for deals with Gazprom,"

He also used German companies as a shield. He said Germany's largest gas importer had already paid in rubles. "In fact, we saw evidence yesterday that the largest gas importer in Germany has already paid in rubles."

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