Humid environments (like basements or bathrooms) pose a severe test to the durability of floor materials. Traditional materials often suffer from cracking and mold. Self-Leveling Microcement, a high-strength, aesthetic material, requires optimized anti-moisture construction technology for successful application in humid settings
Substrate Preparation: The Foundation of Anti-Moisture Construction
Substrate preparation in humid environments is fundamental to ensuring the anti-moisture effect of self-leveling microcement. Improper preparation is a common cause of subsequent water seepage and debonding.
- Cleaning and Leveling: Thoroughly remove oil, dust, and loose matter. Cracks less than 0.5mm wide should be sealed with low-viscosity epoxy resin grout; cracks greater than 0.5mm require V-grooving (depth-to-width ratio ≈1.5:1) and filling with high-strength repair mortar.
- Leak Stoppage and Waterproofing: If the substrate shows water seepage, waterproofing treatment must be done first. Cementitious capillary crystalline waterproofing coating is recommended, applied in two coats at a rate of 1.2-1.5KG/㎡, with a minimum layer thickness of 1.0mm.
Interface Agent and Multi-Layer Moisture Barrier Structure
The Interface Agent plays a critical bonding role in moisture-proofing. The moisture barrier layer uses a composite structure to effectively block moisture migration.
- Interface Agent Selection: In humid environments, prioritize epoxy resin or polyurethane-based interface agents. Epoxy agents must have tensile bond strength (＞2.5MPa) and strength retention after water immersion (≥80%). Application rate is controlled at 0.2-0.3kg/㎡ ; a second coat can be applied to highly absorbent substrates.
- Moisture Barrier Structure: 1.Base Layer: A 160 g/m² carbon fiber mesh reinforcement layer is laid to enhance crack resistance. 2.Middle Layer: Polymer cement-based waterproof coating is used, applied in 2-3 coats, with a total thickness controlled at 1.5-2 mm. 3.Reinforcement: In areas prone to leakage, such as corners and pipe roots, an additional layer of polyester nonwoven fabric with a width of not less than 300mm should be used.
Microcement Modification and Application Optimization
To further enhance the microcement’s anti-moisture performance and compactness, both material composition and application processes can be optimized.
- Chemical: Adding 0.5%-1.5% of silicone-based waterproofing agent forms a hydrophobic film inside the material, which can reduce water absorption by 40%-60%.
- Physical: Increasing the redispersible latex powder content (from 3%-5% to 5%-7%) enhances flexibility and adhesion; incorporating nano-silica or nano-calcium carbonate fills pores, reducing porosity by 15%-25%.
- Thickness and Interval: The thickness of self-leveling microcement is generally controlled at 3-5 mm. The interval between each layer should be no less than 24 hours, and the next layer can only be applied after the compressive strength of the previous layer has reached at least 15 MPa.
Effectiveness Verification: Durability and Bond Strength Improvement
Microcement treated with optimized anti-moisture construction technology shows significant performance improvements:
- Bond Strength: Bond strength can be increased from 1.2 MPa to 1.56 MPa, an increase of 30%.
- Anti-permeability: Unmodified specimens showed water seepage after 1 hour at a water pressure of 0.1 MPa; moisture-proofed specimens showed no water seepage after 24 hours at a water pressure of 0.3 MPa, and the increase in humidity on the back side of the specimen was less than 5%.
- Field Application: In a renovation project of an underground parking garage that had been affected by long-term groundwater seepage, after using this technology, the ground moisture content steadily decreased from 85%-95% to 60%-65%, and no seepage, hollowing, or cracking occurred within 18 months.
One-Stop Formula Development Service
If you are a coating or ink factory and want to produce coating,
we can provide:
- customized formula based on your requirements
- raw material supply
- production process guidance
- 100% implementation support until your product is stable
Helping your project run smoothly and reduce production risk.
Contact us for the complete recipe proportions.
[1]戈君飞.自流平微水泥在潮湿环境中的防潮施工关键技术[C]//重庆市大数据和人工智能产业协会,重庆建筑编辑部,重庆市建筑协会.智慧建筑与智能经济建设学术研讨会论文集（一）