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|  In PractIce  |  IndustrIal CleanIng Cleaning industrial floors Professionalism with a capital P Industrial floors are not meant to dazzle with their beauty, but they require particularattention nonetheless. This applies as much to the way they are manufactured as to their coating, cleaning, and maintenance. They have to endure extraordinary stress and strain. And they have to be safe. Besides, many companies attach great importance to a neat appearance in the production areas, too. By definition, industrial floors in many companies must be 33Permeable impregnation agents that penetrate the screed at a able to withstand a lot of stress, mechanical or other. At the same depth between 0.5 and 3 millimeters, depending on substrate time, they need to be slip-resistant to ensure safety under any quality, to ensure a certain stiffness. conditions. Most floors consist of a smooth, seamless, heavily 33Chemical sealants, by which the sealant is applied like an compacted, highly stress-resistant screed made from a paste that impregnation agent. The surface is hardened, making it more is very viscous when applied. This mass is poured and spread resistant to chemical and mechanical stresses. directly on-site, where it is subsequently left to cure. The following 33Permeable sealants, which are relatively thin at a thickness of screed types are fairly common: 0.1 to 0.3 millimeters and resemble a coat of paint. 1. Magnesite (MA): A particularly stiff type of screed that is very 33Coatings, usually 0.5 to 2 millimeters thick. Any finish with a effective at binding mineral aggregates. Magnesite screeds are thickness between 2 and 6 millimeters is considered flooring. usually impregnated during the production stage with an agent Depending on the material used, a fairly structured or almost that reduces the formation of stains and dust to facilitate main- completely smooth surface can be achieved. tenance. 2. Cement (CT): When it comes to industrial applications, only Floor stripping in one or two steps the so-called hard aggregate screeds made from limestone and Let us now turn to the cleaning method consisting of a stripping pass clay are used. Thanks to their thickness and strength class, they and a maintenance cleaning pass. Heavy contamination, such as oil, can endure huge loads. Cement screeds are sensitive to acids and grease or encrusted grime, can only be removed by wet scrubbing strong alkalis, however. Acid exposure causes a structure similar with heavy-duty scrubbers. If the coating allows for this, full contact to washed concrete: The floor roughens, absorbs more dirt, and pressure is applied in combination with green scrubbing brushes or becomes harder to clean. pads to deal with heavy contaminations using the two-step method. A 3. Calcium sulfate (CA): This umbrella term refers to all types of gradual approach is recommended to keep moisture penetration into screed whose binding agents consist of water-free calcium sulfate the floor at a minimum. During the first step, the cleaning water and (anhydrite). Due to their binding agents, they have hygroscopic the scrubber-drier are set up on the surface to be cleaned. The surface properties and are sensitive to moisture. They should therefore is then scrubbed two or three times, until the dirt has been complete- not be exposed to water for long periods of time, especially during ly dislodged. The loosened dirt is then absorbed in a second step. stripping processes. The latter must only be carried out using a Afterwards, the entire surface is treated once more with clear single-step method. water using the single-step method. This means: Apply water, 4. Mastic asphalt (AS): A dense, cavity-free mixture of filler mate- scrub, absorb. For this process, an alkaline stripping agent with rials such as stone wedge, sand, grit or gravel, and bitumen. Mastic a pH value of up to twelve is recommended at a dosage of three to asphalt does not generate dust, is insensitive to water, mostly five percent (depending on the severity of the contamination). This resistant to acids and alkalis, but sensitive to solvents. It usual- stripping agent must not dissolve coatings, however. If coatings ly contains a large proportion of organic filler materials, which must be dissolved, a solution with a concentration of ten percent makes it necessary to use the single-step method on these floors or more is required. For industrial floors that are sensitive to water as well. or lack a surface finish, one-step stripping is preferable because the floor might otherwise absorb excessive amounts of moisture Surface finishing choices… and sustain permanent damage. Scrubbers with roller scrub heads … also need to be taken into consideration before the cleaning have proved particularly effective, here. Also, neutralization with starts. This includes: clear water is necessary. 54 GLOBAL CLEANING | ISSUE 2016


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