Properties of polycarboxylate superplasticizer synthesis
1. Can reduce slump loss. Increase the pumpability of pumped concrete.
2. Can be shortened. Doping expanders can also counteract the shortening
3. Delay the early hydration heat of concrete. Reduce the temperature rise rate of mass concrete and reduce the outbreak of cracks.
4. Improve the early strength of concrete. Avoid freezing in sub-zero temperatures.
5. Improve the strength and increase the anti-freezing, anti-seepage, wear-resistant and corrosion-resistant properties.
6. Control the alkali aggregate reaction. Prevent steel corrosion and reduce chloride ion porosity.
Because the type of concrete additive is different, the effect is also different. The general effect is in the unit cubic concrete water consumption or in the cement amount does not change, can improve the fluidity of the corresponding concrete; In the case of the same cement or concrete slump, water consumption can be reduced, and then the strength of concrete is improved, the durability of concrete is improved; Under the condition of constant design strength and slump of concrete, the amount of cement and cost can be saved. Early strength agent is to improve the early strength of concrete, used for emergency repair engineering and winter construction of concrete; Water reducing agent has the effect of reducing water and enhancing the consistency of concrete. Air entrainment agent is mainly to reduce the concrete mixing process bubble caused by bleeding segregation, improve the workability of concrete; Retarder can delay the concrete setting time, both retarder and water reduction, mainly used for mass concrete, hot weather construction of concrete or long distance transportation of concrete.
Effect of polycarboxylate superplasticizer synthesis on concrete application performance
Through the previous concrete construction work, we can understand the influence of concrete admixtures on the main properties of concrete such as strength and density in application. Generally speaking, the proper amount of admixtures can fully increase the density of concrete. For example, an appropriate amount of water-reducing agent can be added to the concrete to stop optimizing the water-cement ratio in the concrete and improve the compactness of the entire concrete structure. In the construction process of the local concrete project, it is necessary to ensure that the air content of the concrete is sufficient, and an appropriate amount of air-entraining agent can be added to increase the air content of the concrete to complete the project requirements. In addition, in terms of setting time control, relevant personnel can stop using the retarder to ensure the control of concrete setting time. From previous work, it can be seen that the setting time of concrete can reach 3 hours due to the use of retarder. Adding admixtures is one of the important means to improve the strength of concrete. In engineering construction, the bearing capacity of concrete is very high, which is another property that ensures the strength of concrete. Therefore, in the actual concrete operation process, the relevant staff can add an appropriate amount of shrinkage agent to prevent the serious impact on the concrete strength.
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