Protective mats

Enough heat Is generated to produce molten Iron, which can be seen flowing out of the broken pot onto the protective mat at the bottom of the stand. 

Keywords PVC mats, rubber mates, recycled mats, protective mats. 

The goal of this work was an experimental investigation of behaviour of two new types of protective mats made of two different material groups. In this investigation, two types of external effects were simulated the first type was the punching effect of heavy tools the second was the effect of falling objects on the mats. 

The features of waterproofing layers and their protective mats are presented in table 1. Test specimens were taken from these protected multi-layer waterproofing systems. Diagram 1 depicts the principle of protected multi-layer waterproofing system. 

Samples to be tested were kept more than 61 hours in the temperature condition of 23°C and relative humidity of 50% this corresponded to the requirements of SN-ISO 291. Sample stripes were taken from the system composed of protective mat, waterproofing membrane, and the underlying polymeric geotextile polymer bedding the length of the strips amounted to 250 mm. The strips were bonded at discrete end points according to the actual conditions of waterproofing systems. 

Falling object Protective mat Thickness [mm] Thickness of Waterproofing membrane [mm] Fall height [mm]... 

Figure 1. The falling object with the spherical nuzzle mounted on the testing device and the specimen which is constituted of protective mat, the waterproofing membrane, and the geotextile polymeric sheet.

The perforated protection mats depicted a one-sided lapping as shown in the photograph (3). Because of this lapping, during placement of fresh concrete—and due to loading—the waterproofing membrane may be damaged. 

Figure 3. Composition of the protective mat and the mode of damage in one of the samples...

In other parts of the world, a synthetic grass mat has been used to collect current-borne sediments enabling a protective mat of sand to accumulate. In Boa Vista, Cape Verde Islands the natural seabed is composed of water-worn pebbles of volcanic rock. These are easy to handle underwater and a layer of 100 mm pebbles overlain with some well-chosen boulders protects the site from marine and human interference. The insertion of a short tail of orange cord serves as buried marker. It is discrete, moving gently in the current, and to the casual intruder is much like other marine growth and debris. 

This also applies, for example, to the soft PVC mats made for roller-mounted office chairs. These thick foil mats, about 1 m in size, emit plasticizers into the breathing air of the desk worker over a period of months. Since very few low-emission or emission-free products are available, the only piece of advice worth following is to tmpack the carpet protection mats and leave them exposed to the sun on the balcony for three months before using them. 

Uses Surf, modifier, surf, protectant, matting agent, mar resist, aid for solvent-borne wood coatings based on two-part PU, alkyds, acid-cured melamines, NC and blends... 

The application of special types of PP fibers is growing in medicine, particularly as surgical threads, bandages, pads, prostheses, membranes for ultrafiltration of blood, wraps for diapers, bedsore protection mats, mulls, surgical uniforms, etc. 

Fig. 8.1. The installation of the sand-filled protective mat or geocontainer (MDDS mat) on a geomembrane is shown in Fig. 9.9. This picture illustrates a technical weaving trick in the production of the double fabric with spacers, into which the sand is filled. The double fabric is woven in such a way that it thins out toward the edges in a wedge-shaped way and the rolls are installed in a manner that the two wedges lie on top of one another. Thus a sharp joint edge or a sharp-edged overlap can be avoided and the protective effect can be ensured within the joint range without any restriction...

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