In recent years, concrete blankets have gained widespread application in engineering fields—such as hydraulic slope protection, river channel management, road reinforcement, and environmental seepage control—thanks to their advantages of convenient installation, excellent impermeability and durability, and high cost-effectiveness. As a leading enterprise in China’s geosynthetics industry, Shandong Hongyue Environmental Engineering Co., Ltd. has drawn upon extensive engineering practice and technical R&D experience to officially release a comprehensive guide on the precautions for using concrete blankets throughout the entire process. This guide aims to assist construction units in executing scientific construction and standardized operations, thereby ensuring both project quality and service longevity.
I. Storage and Transport: Protect Against Moisture and Damage—Safeguarding the Material’s “Lifeline”
The technical team at Hongyue Environmental emphasizes that concrete blankets undergo a hydration reaction immediately upon contact with water; therefore, the critical priorities during the storage and transport phases are preventing moisture exposure and physical damage. The material must be stored in a dry, well-ventilated, and rain-proof indoor environment, or in an outdoor area that is tightly covered with tarpaulins. Exposure to open-air rain or dampness is strictly prohibited to prevent premature curing and subsequent material failure. During handling, the material must be lifted and placed gently; dragging, bending, or puncturing is strictly forbidden, and the material should be kept away from sharp, hard objects as well as acidic or alkaline corrosive substances. When stacking, ensure the piles are level and do not stack them too high, to prevent the weight from deforming the blanket or damaging its internal structure.
II. Subgrade Preparation: Ensure Flatness and Compaction—Solidifying the “Foundation” of Construction
Subgrade preparation is the key to the long-term stability and durability of concrete blankets. Before construction begins, the site must be thoroughly cleared of gravel, tree roots, weeds, and any sharp debris to prevent punctures to the blanket material. The subgrade must be flat, firm, and free of loose soil layers; for slopes, it is recommended that the gradient be controlled within a range of 1:1.5 to 1:3, with a flatness tolerance of no more than ±15 mm over a 2-meter span. Soft soils or silty soils require thorough compaction or the installation of a graded crushed stone cushion layer; in areas with high groundwater levels, blind drains or drainage layers should be installed to prevent water accumulation in the subgrade from compromising the quality of the concrete blanket’s curing process.
III. Installation: Standardized Overlapping—Strictly Controlling Potential “Weak Points” in Seepage Control
During installation, the concrete blanket must be allowed to unroll naturally and lie in close, tight contact with the subgrade. Pulling, twisting, or leaving sections suspended above the ground is strictly prohibited; the goal is to ensure a smooth, uniform surface free of wrinkles or hollow voids. Overlap Treatment as the Core of Impermeability: In scenarios involving water flow—such as riverbeds and drainage ditches—the upstream section *must* overlap the downstream section. The lateral overlap width must be ≥ 15 cm, and the longitudinal overlap width ≥ 20 cm. All overlap joints must be compacted with a roller to ensure there are no voids or air bubbles. Anchoring is achieved using U-shaped anchor pins; the standard spacing is 1.0–1.5 m, but this density must be increased to ≤ 0.5 m at the slope crest, slope toe, corners, and overlap joints. For steep slopes (> 25°), additional anchor trenches must be excavated; these trenches require a burial depth of ≥ 30 cm and must be backfilled and compacted to prevent slippage or edge lifting.
IV. Curing: Uniform Watering to Address the “Critical Point” of Strength Development
Water curing is the pivotal stage in the cement blanket’s transformation from a flexible state to a rigid one. The use of high-pressure water jets for direct spraying is strictly prohibited; instead, low-pressure misting or a shower-head attachment must be used to ensure uniform watering, ensuring the material is thoroughly saturated without leaving dry spots or causing water accumulation. The water used must be clean; wastewater containing oil, grease, acids, or alkalis is strictly forbidden. Watering must be performed on the same day the material is laid to prevent premature drying and hardening overnight. At ambient temperatures (approx. 20°C), initial setting typically occurs within 1–2 hours, and the material reaches its initial strength within 24 hours.
V. Maintenance: Meticulous Protection to Extend the Project’s “Lifespan”
Disturbance is strictly prohibited during the curing period: Foot traffic is forbidden within the first 24 hours, and heavy pressure, impact, or dragging are forbidden within the first 7 days to prevent structural damage. For the first 3 days, water should be sprinkled 1–2 times daily to maintain moisture levels; in high-temperature conditions (> 30°C), watering frequency should be increased, and the surface should be covered for shade during periods of intense sun exposure. In low-temperature conditions (< 5°C), thermal insulation and frost protection measures are required. The designed service life of the material exceeds 10 years; to further extend its service cycle, it is recommended to apply a fresh coating of cement slurry to the surface every 2–3 years.
Post time: Apr-13-2026
