Application of Polycarboxylate Superplasticizer in Cement-based Self-leveling Mortar
In the production and formula optimization of cement-based self-leveling mortar, polycarboxylate superplasticizer is the core admixture that determines the product quality, directly affecting the construction fluidity, strength stability and ground forming effect of the mortar. Many manufacturers often encounter problems such as poor leveling, cracking and powdering, and strength not meeting the standards when adjusting the formula due to improper selection of the water reducer and inaccurate control of the dosage. Only by mastering the correct application logic can high-quality self-leveling products be stably produced.
The core value of polycarboxylic acid high-efficiency water reducer lies in achieving efficient water reduction and dispersion at a low water-binder ratio, enabling the mortar to maintain good fluidity and self-leveling ability with less water added, and avoiding problems such as shrinkage cracking and hollowing due to excessive water. Meanwhile, high-quality self-leveling specific water reducer has excellent slump retention performance, effectively controlling the loss of mortar fluidity, extending the open time for construction, and being suitable for large-scale continuous floor construction, ensuring a smooth construction process and uniform finished effect.
The rational use of water-reducing agents can significantly enhance the density of mortar, reduce internal porosity, and improve the compressive, flexural strength and wear resistance after hardening, making the ground more durable and less prone to powdering and damage. It is well compatible with common components of self-leveling such as redispersible latex powder, defoamer and retarder, and will not cause abnormal conditions such as segregation and bleeding. It is the stable core of the entire formula system.
In actual production, self-leveling specific low-air-entraining and high-retention poly-carboxylic acid water reducing agents should be selected, and ordinary concrete water reducing agents cannot be used directly. The conventional dosage is controlled at 0.15% to 0.4% of the total amount of cementitious materials. For most mature formulas, 0.2% to 0.35% is appropriate. Insufficient dosage will lead to poor flowability, while excessive dosage may cause bleeding and whitening, as well as cracking in the later stage. Small-scale tests should be conducted in combination with raw materials for fine-tuning.
By choosing the right compatible model and precisely controlling the dosage, it is possible to effectively avoid construction and finished product defects, enhance the comprehensive performance of cement-based self-leveling mortar, and create high-quality ground materials that are stable and reliable.