Problems Existing in the Practical Application of Polycarboxylate Superplasticizer in Concrete Engineering

(Problems Existing in the Practical Application of Polycarboxylate Superplasticizer in Concrete Engineering)

Effect of Water Consumption on Properties of Polycarboxylate Concrete Mixtures

The influence of water consumption is very obvious. In the actual application of concrete engineering, sometimes if the water consumption is increased by 1 to 3 kg/m3, the concrete will have serious bleeding phenomenon, which will cause defects such as pitting, sanding, and holes on its surface. Uniformity and construction quality cannot be guaranteed, thus resulting in reduced strength and durability of concrete structures.

Polycarboxylate concrete is prone to delamination and segregation

In most cases, the addition of polycarboxylate water reducer to concrete will greatly reduce the viscosity of the slurry. At the same time, even if the dosage and water consumption of the polycarboxylate superplasticizer are optimal, and no bleeding will occur, the concrete is prone to delamination and segregation, which is mainly manifested in the fact that the coarse aggregate will mix with the mortar. , The pure pulp is separated and sinks in large quantities. This kind of concrete mixture does not have any vibration for concrete engineering pouring, and the phenomenon of delamination and segregation is also very obvious.

Compatibility is not ideal

Traditional water reducers such as naphthalene series, aliphatic series, lignosulfonates, sulfamic acid salts can be blended in any proportion, and then can meet various concrete preparation requirements. These traditional water reducers Not only can the agent dissolve well in water, but also can achieve excellent superposition effect when used in combination. Polycarboxylate superplasticizers have great limitations and can only be used in combination with traditional superplasticizers, lignosulfonates, and have poor compatibility with other traditional superplasticizers. If it is used in combination with other types of traditional water reducers, it is not only difficult to achieve the superimposed effect, but also the fluidity of the concrete will be very poor, the water consumption will be greatly increased, the slump loss will be serious, and the concrete will be dry and difficult to discharge. , the strength and durability of concrete will be seriously affected.

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(Problems Existing in the Practical Application of Polycarboxylate Superplasticizer in Concrete Engineering)