How to judge the quality of cement blanket?

Quality acceptance method and standard of cement blanket

general provisions 

1.1 when the average day and night temperature of the construction site is lower than 5 ℃ or the minimum temperature is lower than 0 ℃ for 5 consecutive days, it is necessary to enter the winter construction.

1.2 when the material strength does not reach 60% of the design strength, it shall not be frozen. When the material begins to freeze under the condition of water immersion and freeze-thaw, it shall not be less than 80% of the design strength

Inspection items

2.1. Before laying the composite blanket, the base shall be fully compacted. The simple measurement method is: use a Φ 12mm steel drill rod, use 30kg pressure, and insert into the soil less than 5cm.

Inspection quantity: spot check

Test method: observation and measurement with tools.

2.2. The ditch bottom and side shall be flat; the deviation of ditch section size shall not exceed 5cm. Base leveling treatment, after laying the composite blanket, the flatness is required to be measured with 3M chord rope, and the average loss is not more than 20mm.

Inspection quantity: spot check

Inspection method: observation and measurement with steel ruler.

2.3. The anchor spacing error is required to be ± 5cm; the construction error of screw spacing is ± 2cm. No less nails or missing nails are allowed, and the nails are firmly fixed.

Inspection quantity: total inspection

Inspection method: observation and measurement with steel ruler.

2.4 water the blanket evenly and thoroughly until the color of blanket becomes darker. No less than 9kg per square meter (calculated by 10 mm thick blanket), no less watering. More watering will not affect the quality of the project.

2.5. The slurry should be uniform and the thickness should be uniform. The mass ratio of cement to water should be 1:3 ~ 1:4. There should be no missing or less brushing. Eight

Inspection quantity: spot check

Test method: observation.

2.6. The PVC drain pipe of drainage hole shall be arranged in the form of 2m × 2m plum blossom, which shall not be omitted and installed firmly.

Inspection quantity: total inspection

Inspection method: observation and measurement with steel ruler.

2.7. The reserved size of the end face of the new cement blanket shall meet the requirements: 1-2m width of the slope length reserved at the top of the slope, and 50cm of the reserved length of the bottom surface.

Inspection quantity: total inspection

Inspection method: observation and measurement with steel ruler.

2.8. The laying and installation of materials shall comply with the requirements of construction design, and shall be stable and reliable, with tight joints, smooth and beautiful appearance.

Inspection quantity: total inspection

Inspection method: observation and measurement with steel ruler.

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