Application of Polycarboxylate Superplasticizer in Gypsum‑Based Self‑Leveling Mortar
In the current process of interior floor construction and refined home decoration, gypsum‑based self‑leveling mortar has become a commonly used high‑quality material for fine leveling of base courses and backfilling of underfloor heating systems, owing to its advantages such as fast construction speed, smooth finished surface, low shrinkage and environmental friendliness. To maintain stable performance on site, a scientific and reasonable admixture compounding scheme is essential. Among them, polycarboxylate superplasticizer is a key additive that determines the workability, strength and long‑term stability of the mortar.
Gypsum‑based self‑leveling materials have strict requirements on mixed slurry performance. Sufficient flowability is required to achieve self‑leveling without vibration, while water dosage must be strictly controlled to avoid hollowing, cracking and insufficient strength caused by unbalanced water‑material ratio. Conventional water‑reducing admixtures often show poor dispersion, rapid flow loss and poor compatibility with base materials in gypsum cementitious systems, failing to meet both construction convenience and finished floor quality standards.
Specially formulated polycarboxylate superplasticizer disperses gypsum particles through an optimized molecular structure and dual‑action mechanism. It can effectively reduce mixing water at low dosage and maintain slurry workability for a long time without rapid thickening during construction. In practical engineering, this superplasticizer can effectively extend the operable time of mortar to suit large‑area continuous construction. It also densifies the hardened floor structure, improves compressive and flexural strength, reduces shrinkage deformation and cracking risks, and prolongs service life.
In addition, the superplasticizer is highly compatible with common retarders, water‑retention agents and defoamers used in gypsum systems, avoiding slurry bleeding, segregation and settlement, and ensuring stable performance of different batches. With the continuous improvement of construction quality requirements, this high‑performance superplasticizer serves as an important support for optimizing gypsum self‑leveling mortar performance and improving floor engineering quality, promoting the steady development of the industry toward high efficiency and high quality.