Concrete on roll 3d canvas cement cloth powder blanket harden after hydrate

Product Details

1. The structure and performance characteristics of cement blanket

What is cement blanket?

Cement blanket is a soft cloth impregnated with cement, which will hydrate when exposed to water and harden into a thin layer of durable concrete that is waterproof and fireproof. The cement blanket is a three-dimensional fiber composite structure woven from polyethylene and polypropylene filaments (3D fib

matrIX), containing a specially formulated dry concrete mix (Dry concrete mix). The main chemical components of calcium aluminate cement are A2O3, CaO, SiO2, Fe2O3. The underside of the canvas is covered with a polyvinyl chloride (PVC) backing, ensuring that the cement blanket is completely waterproof. During on-site construction, there is no need for any concrete mixing equipment on site, just simply pour water on the cement blanket or soak the cement blanket in water to make it hydrated. After setting, the fibers act to reinforce the concrete and prevent it from cracking.

At present, there are three thicknesses of cement blanket: 5mm, 10mm, 30mm

2. Main features of cement blanket

1) Easy to use

Cement blankets are available in bulk in large rolls. It can also be provided in rolls, which is convenient for manual loading and unloading and transportation, without the need for large lifting machinery. Concrete is prepared according to the scientific ratio, without on-site preparation. Overhydration issues do not occur. Whether underwater or in seawater, the cement blanket can be solidified and formed

2) Rapid solidification molding

Once the hydration reaction occurs after watering, the necessary processing of the size and shape of the cement blanket can still be carried out within 2 hours, and it can harden to reach 80% of its strength within 24 hours. According to the special requirements of users, special formulas can also be used to achieve the purpose of rapid solidification or delayed solidification.

3) Environmentally friendly

Cement blankets are a low-quality, low-carbon technology that, in many applications, uses up to 95% less material than commonly used concrete. It has a limited alkali content and a very low scour rate, so it has little impact on the local ecology.

4) Application flexibility

The cement blanket has good drapability and can follow the complex shape of the surface of the covered object, even forming a hyperboloid shape. The cement blanket before solidification can be cut or trimmed freely with common hand tools.

5) High material strength

The fibers in the cement blanket can enhance the strength of the material, prevent cracking, and can absorb impact energy to form a stable failure mode

6) Long-term durability

The cement blanket has good chemical resistance, anti-wind and rain erosion, and will not be degraded by ultraviolet rays in the sun

7) Waterproof properties

The underside of the cement blanket has a waterproof layer, making it completely waterproof and enhancing the chemical resistance of the material.

8) Fire characteristics

The cement blanket will not support combustion and has good flame retardant properties. When it is on fire, the smoke is very small and the emission of dangerous gases is very small. The cement blanket has reached the B-s1, d0 level of the European building material flame retardant standard.

3. Technical parameters of cement blanket

1) Physical properties

2) Solidification time

Initial coagulation ≥ 120 minutes; final coagulation ≤ 240 minutes.

After 24 hours of hydration reaction, the cement blanket can reach 80% strength.

3) Hydration reaction

Cement blankets can be hydrated with brine or non-brine. The minimum weight ratio of water and cement blanket is 1:2. Cement blankets do not overhydrate, so excess water is always recommended. Water can be sprayed on the fiber surface several times until the cement blanket is saturated. As the cement blanket absorbs water, the color darkens at first and becomes lighter later. When water accumulates on the surface or runs down

Indicates that the cement blanket is saturated with water.

After the initial hydration reaction, the cement blanket should be re-wetted at least once between one and two hours

This is especially necessary in hot, dry weather where evaporation of moisture can cause the concrete to dry out too much.

The product HJ008 cement blanket is the most prone to over-drying. No matter what the weather is, one to two hours after the hydration reaction, it should be re-wet once or more times. Do not spray water directly on the cement blanket with a high-pressure water spray gun, otherwise it will cause damage to the cement blanket. Punch the surface of the cement blanket into a groove shape. If the cement blanket is not adequately protected by water, setting will be delayed and the material strength will decrease. If the setting time is delayed, it should be re-wet with plenty of water. The cement blanket can be used underwater, and at this time, because it is soaked in water, the hydration reaction can fully occur.

4) Strength

The initial strength of cement blanket is very high, which is the basic characteristic of this material. Typical strength and physical characteristics are as follows

①Compressive strength test according to ASTM C47307 standard

--10 days compression failure stress 40MPa

--10 days compressive Young's modulus 1500MPa

②Bending test according to BSEN12467:2004 standard

--10 days bending failure stress 34MPa

--10 days flexural Young's modulus 180MPa

③Abrasion resistance test according to DN52108 standard

--Similar to the wear resistance of ceramics, the maximum is 0.10 g/cm2

④ Mohs hardness 4-5

⑤ CRB puncture resistance according to EN ISO12236:2007 (only HJ008)

--The minimum propulsion penetration force is 2.69Kn

--The maximum deflection peak value is 38mm

⑥According to EN1991-1-1:2002 standard, anti-vehicle load (only H008)

--Meet the requirements of class G

--Gross weight of 2-axle vehicle 30-160Kn

--The uniformly distributed load does not exceed 5kN/square meter

⑦Passed in accordance with ASTM G13 pipeline anti-corrosion layer impact standard test method

⑧Pass the freeze-thaw test according to section 5.52 of BSEN12467:2004 standard

⑨Pass the immersion-drying test according to section 5.5.5 of BSEN12467:2004 standard

⑩According to BSEN12467:2004 standard section 544 water permeability test passed

⑪PVC backing thickness 042mm, moisture vapor transmission rate 0836-0924gmmm2 days

⑫2 Static pressure head of cement blanket <3000mm

Four, laying construction

1. Preparation

First of all, it is necessary to plan and measure to ensure a certain slope, so that the water can flow smoothly from the upper end to the lower end; second, after the construction site is cleaned and leveled, the construction line is set according to the design drawing, and the drainage slope is re-measured.

2. Excavation

Set the construction line according to the design requirements, the sides of the ditch need to be leveled, and there must be no virtual soil on the slope inside the ditch

and hollow. It is necessary to tamp the water-damaged parts, remove all sundries and gravels in the slope, if necessary, use notoginseng ash soil for tamping treatment, or seal it after grouting reinforcement, and the treated parts are required to have good stability

3. Laying

Materials can be laid vertically and horizontally. Please be sure to arrange the base evenly, otherwise it will affect the appearance quality!

4. Seam treatment

1. Dig horizontally at the place where two adjacent cement blankets are superimposed, with a width of 10cm and a depth twice the cement blanket

Put the cement blanket joint in the overlapping place and press it flat.

2. Press the upper cement blanket on the lower cement blanket along the direction of water flow, and the superimposed part should not be less than 10cm

3. Spread the sealant evenly on the seams.

4. Fix the two cement blankets with Φ5*38mm stainless steel screws

5. Ditch edge treatment

Fix the edge of the material on the edge of the ditch with rivets, and fix the superimposed part with rivets. After fixing, use

Soil covers the edges

6. Watering and solidification

Before watering, it is necessary to check and accept the overall laying, and watering can only be done after passing the test! Every square meter

It needs to be watered 9kg (thickness is calculated as 10m), and it must be watered thoroughly. It must be poured evenly from the edge to the middle.

Sprinkle water, preferably by spraying, with a flow rate of 4000l/min, until the color of the cement blanket becomes darker.

Do not use a water column with high pressure! It is forbidden to step on it after pouring water, and insulation measures should be taken when the temperature is ≤5°C

When the average day and night temperature is higher than 30℃, the surface should be covered with materials such as plastic film or geotextile to protect

Keep it moist, and the watering maintenance time should not be less than 3 days

5. Quality acceptance methods and standards

General provisions

1.1. When the average day and night temperature of the construction site is lower than 5°C or the minimum temperature is lower than 0°C for 5 consecutive days, it should be confirmed

Set to enter the winter construction.

1.2. When the material strength does not reach 60% of the design strength, it shall not be subjected to freezing. Under freezing and thawing conditions

When the material begins to be frozen, it shall not be less than 80% of the design strength

Test items

2.1. Before laying the composite material blanket, the base is required to be fully compacted. The simple measurement method is: use Φ12m

Steel needle, with 30kg pressure, inserted into the soil less than 5cm

Inspection Quantity: Sampling

Inspection method: observation and measurement with tools

2.2. The bottom of the ditch and the side of the ditch are required to be flat; the deviation of the cross-sectional size of the ditch is not easy to exceed 5cm. base leveling

After laying the composite material blanket, the flatness is required to be measured with a 3m string rope, and the average loss is not more than 20m

Inspection Quantity: Sampling

Inspection method: observation and measurement with a steel ruler

2.3. It is required that the anchor spacing error is ±5cm; the screw spacing construction error is ±2cm. No less nails,

Missing nails, and the nails are firmly fixed.

Inspection Quantity: Full inspection

Inspection method: observe and measure with a steel ruler.

2.4. Watering should be even and thorough until the color of the blanket becomes darker. Not less than 9kg per square meter (based on

10mn thick blanket), no less watering. More watering does not affect the quality of the project.

Inspection Quantity: Full inspection

Inspection method: observe and measure with a steel ruler.

2.5. The slurry should be evenly brushed and the thickness should be uniform. The cement:water mass ratio should be 1:3~1:4, and there should be no leakage

Inspection Quantity: Sampling

Inspection method: observation

2.6. The PVC drain pipes of the drainage holes are laid out in a plum blossom shape of 2m×2m, and must not be missed, and the installation is firm

Inspection Quantity: Full inspection

Inspection method: observation and measurement with a steel ruler

2.7. The reserved size of the end face shall comply with the regulations: 1-2m width of the reserved slope length at the top of the slope, and 50c reserved length at the bottom

Inspection Quantity: Full inspection

Inspection method: observation and measurement with a steel ruler

2.8. The laying and installation of materials should comply with the construction design regulations, and be stable and reliable, and the joints should be tight, flat and beautiful

Inspection Quantity: Full inspection

Inspection method: observation and measurement with a steel ruler

6. Later maintenance and precautions

1. This material is used in the central region of my country, and the design life is more than 50 years. In order to prolong the service life, it is recommended to maintain the material every 5-10 years. Brush a layer of cement slurry on the surface of the material blanket, which can effectively prolong the service life of the material.

2. After the strength of the material reaches 10.0Ma, it can bear the load of personnel and light construction machinery

3. After the material is poured with water and before the final strength is formed, it is not allowed to beat or pull strongly: it is not allowed to use sharp objects to knock the material.