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Cementing Admixture Considerations
Sep 07, 2017

Cement admixtures are used in cement applications to improve or achieve various properties, such as quick drying or enhancement, such as water reducing agents, to reduce water content, such as retarded coagulants.

Cement additive is a foreign term, cement additives and cement additives are used in cement. Cement additive is a chemical additive to improve the effect and performance of cement grinding. Cement additive can significantly reduce the grinding ball phenomenon formed in the process of electrostatic adsorption package, and can reduce the grinding of ultrafine particles in the process of coalescence trend again, reduce grinding phenomenon. The cement additive can also improve the cement fluidity, improve the grinding efficiency of the mill and the selection efficiency of the mill, so as to reduce the energy consumption. As a chemical activator, cement additives can improve the distribution of cement particles and stimulate the hydration activity of various materials, thus improving the early strength and the later strength of the cement.

The dosage

Generally, the amount of added quantity is one thousand to three thousand, tons of cement costs three to five yuan, and the cost of cement can be reduced by five yuan to the right.

composition

The main components of cement admixture include polyols, polyether alcohol amine, triethanolamine, calcium chloride, sodium chloride, diethylene glycol, triisopropanolamine, ethylene glycol, glycol, urea glycerin, etc.

Common state

Common cement additives have both liquid and powder (solid), which can significantly improve mill output, improve product quality, or reduce grinding power consumption. The cement additive in the process of wet milling is also called dispersant.

The accelerator is an admixture that causes rapid solidification of cement concrete. The accelerator is mainly used in shotcrete and shotcrete. Along with economic development and technological progress, accelerating the use of broader, in underground engineering, tunnel engineering, the dam slope reinforcement, plugging water project, the sliding mode technology construction, road repair, spray anchor bracing, a large number of quick-setting rapid hardening technology is adopted. With its unique effect and flexible adaptability, the accelerator has attracted the attention of engineering technicians from all over the world.

Strictly speaking, it can only be a concrete accelerator, not a cement accelerator. Accelerating agent into concrete, the main components of the sodium aluminate and sodium carbonate in the alkaline solution rapidly and gypsum in cement reaction to form sodium sulfate, make plaster to lose its original retarding action, leading to rapid hydrated calcium aluminate minerals, and separation the hydration products of crystal in solution. The cement concrete is quickly congealed.

Notes:

1, please do not add the goods when material mixing, gravel, sand contains a large number of moisture, suction accelerator short-term time without injection decomposition of its speed, condensed affect the setting time, reduce the strength of concrete, will lead to the adverse effect of sprayed concrete.

2. Before use, the test should be carried out for the test of the cement varieties used for the project, and the quantity of mixing can be used in large quantities. Storage of expired cement cannot be used. Cement that does not meet national standards cannot be used. Proper storage of the accelerator is required to prevent the failure of the damp. To strengthen early water spraying and ensure the later strength. Strict control of the water-cement ratio. Water seepage works must be increased in quantity