How to use the new cement blanket?

Hydration reaction

The new cement blanket can be hydrated with salt water or non salt water. The minimum weight ratio of water to cement blanket is 1 ∶ 2. Hanji cement blanket will not cause excessive hydration reaction, so it is always recommended to use excessive water. Water can be sprayed several times on the fiber surface until the cement blanket is saturated. Because the cement blanket absorbs moisture, it darkens first and then becomes lighter. When water accumulates or flows down the surface, the cement blanket is saturated with water. After the initial hydration reaction, the cement blanket shall be re wetted at least once between one and two hours. This is especially necessary in high temperature and dry weather, as evaporation of water can cause excessive drying of concrete.

The product hj008 cement blanket is the most prone to excessive drying. No matter what the weather is, one to two hours after hydration reaction, it should be rewatered once or several times. Do not use high-pressure water spray gun to spray water directly on the cement blanket, otherwise the surface of cement blanket will be washed into groove shape. If the cement blanket is not fully protected by water, the setting will be delayed and the material strength will be improved

It will go down. If the setting time is delayed, it should be rewatered with a large amount of water. Cement blanket can be used under water. At this time, because it is immersed in water, hydration reaction can take place fully.

4) Strength

Cement blanket manufacturers tell you that the initial strength is very high, which is the basic characteristics of this material. Typical strength and physical characteristics are as follows:

① Compressive strength test according to ASTM c473-07

- 10 days compressive failure stress 40 MPa

- Young's modulus at 10 days compression 1500 MPa

② Bending test in accordance with BS EN 12467:2004

- 10 days bending failure stress 3.4 MPa

- 10 day bending Young's modulus 180 MPa

③ Wear resistance test according to DIN 52108

- similar to the wear resistance of ceramics up to 0.10 g / cm2

④ Mohs hardness 4 – 5

⑤ Puncture resistance of CRB according to EN ISO 12236:2007 (hj008 only)

- Minimum propulsion penetration 2.69 kn

- maximum deflection peak 38 mm

⑥ Resistance to vehicle imposed load according to en 1991-1-1:2002 (hj008 only)

- meet class G requirements

- gross weight of 2-axle vehicle 30 – 160 kn

- uniformly distributed load not exceeding 5 kn / m2

⑦ According to ASTM G13 Standard Test Method for impact resistance of pipeline anti-corrosion coating

⑧ According to BS EN 12467:2004 section 5.5.2 freeze thaw test passed

⑨ According to BS EN 12467:2004, section 5.5.5, the immersion drying test was passed

⑩ According to BS EN 12467:2004, the water-saving permeability test is passed

The thickness of PVC backing is 0.42 mm, and the moisture transmission rate is 0.836 – 0.924 g.mm/m2d

Static head of cement blanket < 3000 mm