2 pumping agent composition
Pumping agent is usually compounded by the different roles of the additives. The combined ratio should be used under different temperature, different purpose, different concrete strength grades, different pumping conditions to determine. Mainly by the following components:
2.1 Water Reducer
Commonly used are calcium lignosulfonate and lignin sulfonate, naphthalene superplasticizer, such as superplasticizer. Naphthalene series water reducing agent in these and other big slump loss; polycarboxylate superplasticizer a low slump loss, and less water is better, more applicable for high-performance concrete with low water-cement ratio, the current are widely used.
2.2 retarder
How hydroxy retarder major carbohydrates, lignin, and sugars. Is currently using more sugar retarder, mainly sodium gluconate, retarding effect, the content also increased under the appropriate role of concrete strength.
2.3 aquasorb
Paul also called thickening agent, whose role is to increase the viscosity of polymer concrete, mainly polyacrylic acid, polyvinyl alcohol and other water-soluble polymer. Mud mixed with water to form a protective colloid, the dispersed slurry a stabilizing effect, while increasing the cohesiveness.
2.4 Early Strength Agent
Can improve the early strength of concrete on the strength of no significant impact later admixtures. Its main role is to accelerate the rate of cement hydration, and promote the development of early strength concrete, both early strength function, but also some water reduction enhancements. Commonly used are: sulfate, triethanolamine, formic acid and calcium sulfate in which the most widely used, the weight of the cement content of 5% to 6%, also according to the construction of concrete performance requirements and conditions change, appropriate adjustments to content, or through Test OK. Both in the winter construction applications, can also form removal at room temperature to shorten the time, save construction costs.
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