The XUNDA Petrolatum Tape is a non-hardening and non-cracking corrosion protection wrap . It is also called wax tape, grease tape. It is highly resistant to mineral acids, alkalis, salts and micro-organisms and highly impermeable to water vapor and gases. Used for the protection of buried or exposed pipes, rods, cable, valves and metal fittings from corrosion.
It is composed of a non woven fibre fabric coated with a neutral compound based on saturated petrolatum and inert siliceous fillers.
Non-woven synthetic fibre impregnated and coated with a neutral compound based on saturated petrolatum hydrocarbons ( Petrolatum ) and inert siliceous fillers. It is supplied in rolls in a range of widths.
Grouting must be strictly controlled from the following aspects to ensure the quality of the project.
1 metering
It is necessary to ensure the accuracy of the measurement accuracy level, the measurement error is ±1%, and a special person is allowed to measure and feed.
2 stirring
Stirring time should be more prolonged than general grouting and Qingdao grouting. It must be ensured that the mixing is uniform. If the expansion agent is not evenly mixed, it will not achieve the intended purpose, and may even have adverse effects. It is usually extended by 30s.
3 vibrating
Vibrating is an important part of controlling quality. It must be non-leakage, no vibration, and no over-vibration. Finally, the grouting and Qingdao grouting can achieve a dense effect. The compact standard is that the grouting is no longer sinking. The surface is not flooded and no bubbles are produced.
4 conservation
This process must be highly valued, because the performance of the grouting has a direct and important relationship with the humidity conditions. The general wet culture time is 14d. The project uses water storage and curing, and the curing time is 7d.
5 plastering
This process directly affects whether plastic cracks will occur. After initial setting, the surface is pressed with a wooden mold for at least 2 times, and the last pass is applied before final setting to avoid the occurrence of early cracks.
Effectiveness analysis
The strength of the prepared test specimens completely meets the design requirements. After the completion of the construction, the wet joints are observed to have no cracks, and the adjacent parts are tightly combined to achieve the intended purpose, which is affirmed by the construction unit and the design unit.
2 Strengthening the mixing to achieve homogenization and strengthening the maintenance to ensure the humidity conditions are two key points to play the role of expansion agent, and it is also different from other admixtures. As a supervision, this understanding is particularly profound. In this way, you don't have to worry about the local expansion caused by local unevenness; catching the moisturizing care also sends out a major factor that may cause cracking.
3 At present, in the highway application, the determination of the 14d limit expansion ratio of the expansion agent-filled grout and the Qingdao grouting water has not received sufficient attention, and the phenomenon of use by experience is more common, which does not meet the requirements of relevant regulations and guidelines. To ensure the correct and reasonable application of the expansion agent.
4 The first-line grassroots technology and test personnel used to be busy on-site work in the past. They lacked understanding of the mechanism of grouting. They did not have a deep understanding of the application precautions. It was often an accident, a lesson learned, a step to raise awareness, and verified through this engineering practice. The practical application effect of grouting material and Qingdao grouting material has accumulated the technology and experience of using grouting material. 
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