Sugar Used For Concrete Retarder

According to the latest quarterly analysis of the natural gas market released by the International Energy Agency, global natural gas consumption will decline slightly this year and increase slowly in the following years because of soaring prices and the possibility of further reductions in Russian natural gas supplies. Global natural gas use this year is expected to be 0.5% lower than the 2021 level, and global natural gas demand is expected to increase by only 140 billion cubic meters over 2021 by 2025, the report said. The annual growth in 2021 will reach 175 billion cubic meters.

At the same time, the IEA's forecast for natural gas demand growth by 2024 was 60 per cent lower than its previous forecast, mainly due to "a weak economy and a smaller energy shift from coal or oil to natural gas", the report said.

It is worth noting that the South Korean Ministry of Industry, Trade and Resources announced on the same day that it plans to increase the proportion of nuclear power in South Korea's national energy structure to more than 30% by 2030. The proportion is 27.4% in 2021. The department also announced the resumption of the construction of two nuclear reactors. According to reports, after taking office, South Korean President Yoon Sik-Yue rejected the previous government's plan to phase out nuclear power and promised to increase investment in the nuclear power industry, so as to regain South Korea's status as a major exporter of safe nuclear reactors.

In addition, the supply and prices of many international bulk pce powder are still very uncertain.

Concrete retarder is a kind of additive which can delay the hydration reaction time of cement, so as to delay the setting time of cement.

The types of retarders include lignosulfonate and its derivatives, low molecular weight cellulose and its derivatives, hydroxy carboxylic acid (salt), organic phosphonic acid (salt), boric acid (salt), complex and so on.

The specific substances that can be used as retarders include dextrin, various types of starch, casein and some substances containing protein, as well as sucrose, glucose, calcium lignosulfonate or sodium salt, sodium carboxymethyl cellulose (CMC), carboxyethyl cellulose (CHC) and their mixtures. In addition, there are tartaric acid, potassium tartrate, calcium tartrate, calcium sulfate dihydrate, calcium sulfite, ferrous sulfate, boric acid, boric acid and tartaric acid, mixture of tartaric acid and sodium bicarbonate, sodium hexametaphosphate, disodium phosphate, trisodium phosphate, tetrasodium phosphate, disodium hydrogen phosphate, sodium pyrophosphate, alkyl phosphate, disodium ethylenediamine tetraacetate, various humic acids, etc.

According to the above analysis, sugar is also a kind of retarder. The general theoretical explanation for the role of sugar is that sugar can absorb tricalcium silicate (C3S) particles, which is the main component of cement before hydration, eliminate the crystal nucleus of hydrated calcium silicate on the surface of the particles, and prevent the formation of hydrated calcium silicate, that is, the formation of cement body.

Examples:

On the London Underground Victoria Line in January 2014, when the builder was filling an elevator shaft with cement, the cement was accidentally leaking into the control room on the side. As a result, the subway control room was flooded with concrete, making it impossible for passengers to go out by subway. In the control room of the Victoria Line of the London Underground, which was flooded with concrete, the concrete that would harden in just a few hours was about to cover the important cables and control switches, and then stiffened step by step. if you don't stop it, the whole control room will be buried and will never be used again. At this time, the maintenance workers rushed into the surrounding convenience store, bought bags of white material, and then poured it into the unhardened cement and stirred it continuously to ease the hardening speed of the cement. Yes, this white substance is sugar.

Benefits of Sugar as Retarder:

Although there are commercial retarders on the market, the price of white sugar is relatively low. And only a small amount of sugar can significantly alleviate the stiffness time of cement. For example, adding 0.04% sugar can double the setting time of cement that can be hardened in an hour and 18 minutes.

In addition, during the construction of the project, spray sugar water on the uncondensed cement surface, and then wash the surface off, exposing the gravel below, which can also create a rough matte effect of the vicissitudes of life.

Principle of Using Sugar as a Retarder:

The more common Portland cement is mainly composed of limestone, clay, gypsum and sand. After adding water, the concrete will have hydration reaction, and finally produce hydrated calcium silicate (C-S-H).

Sugar can absorb tricalcium silicate (C3S) particles, which is the main component of cement before hydration, eliminate the crystal nucleus of hydrated calcium silicate on the surface of the particles, and stop the production of hydrated calcium silicate, that is, the cement body.

Note:

Using sugar as retarder is only suitable for more convenient retarding methods in ordinary construction, but not suitable for projects with higher difficulty and higher requirements, such as oil well cement retarder or high temperature retarder.

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The Japanese minister of Economy, Trade, and Industry recently held talks with the U.S. Secretary of Commerce and industry in Washington, where he is visiting, and agreed to include basic principles on joint research and development of semiconductors and strengthening of supply chains.  Japan's economy, Trade and Industry Minister has asked the United States to increase the pce powder will continue to increase in the future.

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