How to determine the optimum dosage of concrete superplasticizer

John Albanese, leader of the Australian Labor Party, was sworn in as Australia's new prime minister. After his victory, Albanese said he would "make a big change" in the country's climate policy.  

"We now have an opportunity to end the 'climate wars' in Australia," he said.  "Australian businesses understand that doing the right thing on climate is good for our economy and good for jobs, and I hope Australia will join the global effort on climate change," Albanese said Australia would engage with other countries to change policies when it came to tackling climate change.  

In addition, Albanese’s Labor Party has proposed a more ambitious plan to cut emissions by 43 percent from 2005 levels by 2030, the report said. However, Labor is not currently planning to phase out coal use or halt new coal mining projects.  

The climate issue was a major concern of voters in Australia's general election. Mr. Morrison, the former prime minister, was criticized for failing to direct the response to repeated bushfires in 2019 and 2020.

SBS has reported that According to the latest Climate Change Performance Index of 64 countries released at the 2021 United Nations Climate Change Conference (COP26), Australia's climate policy ranks at the bottom of all countries, and is one of the world's worst performers in three aspects of emissions, renewable energy, and energy use.  Australia ranks 52nd in renewable energy, 54th in energy use, and 56th in emissions.  

It is predicted that the prices of many other commodities like the concrete superplasticizer would increase in the next few days.

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.

Due to the limited total amount of traditional energy, people have a huge demand for cleaner and greener new energy alternatives. Now, the emergence of graphene is unlocking the possibility of its application in the energy field, which can create a greener, more efficient, and sustainable future. Here Francesco Bonaccorso, Deputy Director of Innovation at the Graphene Flagship Program, explains how his researchers have developed a series of initiatives to bring graphene from the lab to the commercial market. Graphene has become a research hotspot for new materials in the 21st century. Graphene has been adopted by many industries, the most notable of which are healthcare and key material applications.

The development of graphene has brought huge fluctuations in the demand for concrete superplasticizer, and the demand for concrete superplasticizer will continue to grow in the future. You can contact us for the latest news on concrete superplasticizer.

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