Under normal indoor conditions, self-leveling cement is typically walkable after approximately 24 hours and substantially dry after about 72 hours;
However, it generally requires around 7 days to achieve its stable structural strength.
In actual construction practice, however, a “dry surface” does not equate to “complete internal stability.” Determining the precise moment when subsequent flooring work can truly commence requires an assessment that takes into account both the environmental conditions and the state of the substrate.
Drying Time Overview Engineering Standards
The drying and curing process for self-leveling cement is typically divided into three stages:
- 24 Hours: Foot traffic permitted
- 72 Hours: Surface is substantially dry
- Approx. 7 Days: Attainment of basic standard strength
However, in actual construction practice, these timelines may fluctuate significantly depending on varying site conditions.
Key Factors Affecting Drying Time
1. درجة الحرارة والرطوبة البيئية
Under ideal application conditions:
- درجة الحرارة: 15-25 درجة مئوية
- الرطوبة: ≤60٪
- تهوية جيدة
Under these conditions, the drying rate is most stable.
However, drying time will be significantly prolonged in the following situations:
- Low-temperature environments (<5°C): May extend to over 48 hours
- High-humidity environments (e.g., during the rainy season): Drying slows down significantly
In low-temperature environments, it is typically necessary to employ thermal insulation or cover the surface with a protective film to minimize the risk of cracking.
2. Application Thickness
- Standard Residential Thickness (2–5 mm): Dries completely in approximately 24–72 hours.
- Thick Repair Layer (>10 mm): Dries in approximately 3–7 days.
The greater the thickness, the slower the internal moisture dissipates; this is a general rule observed in the field.
3. Material Proportions and Construction Control
Standard Mix Ratio (Based on Standard Construction Practice): 25 kg Powder + 6–6.5 L Water
Key Construction Control Points:
- Strictly control the water-to-powder ratio.
- Excessive water addition will reduce strength and prolong drying time.
4. Post-Construction Curing Conditions
Upon completion of construction, basic curing control is required:
- Avoid strong ventilation and direct sunlight for the first 3 days.
- Avoid walking on or disturbing the surface.
- Subsequent procedures (e.g., flooring installation) may be performed after 72 hours.
Common Construction Issues
1. Inadequate Substrate Preparation
فشل في perform sanding, dust removal, and the application of a bonding agent قد ينتج عنه hollowness, cracking, and uneven drying.
2. Impact of High-Temperature Construction: In high-temperature environments (>35°C), Since surface moisture evaporates too rapidly,the interior remains incompletely cured leads to surface cracking is prone to occur.
Therefore, misting is required to maintain moisture levels and control the hydration reaction (based on standard construction practice).
3. Winter Construction Challenges: Under low-temperature conditions, hydration reactions slow down. the proper hardening may not occur.
In engineering practice, low-temperature curing systems or adjustments to the construction plan are typically required.
سوء الفهم الشائع
Misconception 1: Surface Dry = Ready for Construction
الحقيقه: A dry surface does not mean that internal hydration is fully complete. This is one of the most common misjudgments encountered on-site.
Misconception 2: Drying time is a fixed value.
Actual drying time is influenced by the following variables:
- درجة الحرارة والرطوبة المحيطة
- Application thickness
- Material mixing ratio
- Substrate absorption rate
Therefore, only a time range can be provided, rather than a fixed duration.
Flooring Installation Recommendation
If you intend to install the following subsequently: Wood flooring, floor tiles or other surface finishing materials, It is recommended to wait at least ≥ 3 days (Basic Safety Period) to ensure that the strength and stability of the substrate meet construction requirements.
الخلاصة الفنية
In real construction applications, the key to controlling drying time lies not in “accelerating the drying process,” but rather in:
- Controlling environmental variables
- Controlling the water-to-material ratio
- Controlling the quality of substrate preparation
Only through the judicious control of these factors can the stability of the drying process be maximized.