Dust-free floors

There is large demand for so-called dust-free floors. These floors may be manufactured by pouring polymer compositions onto a concrete floor. They are easily cleaned of dirt, feature attractive appearance and strength, and form no dust particles in operation. For these reasons they are widely used at enterprises producing nuclear power, pharmaceuticals, and food products, as well as in offices, etc., although their cost is estimated at 50—100 per square meter. 

C. Partitions and floors should be washed to maintain a dust-free condition. 

The first step will be dust removal. The influx of dust and other desert debris is a natural consequence of increased access to the tomb. Furthermore, the tomb floor is a reservoir of dust. We have examined the role of dust in the deterioration of mural surfaces (17-21), After the removal of dust, a dust-free, preformed cement, or better still, granite floor should be installed. Parts of the tombs in which paintings are already irretrievably lost must be covered with polished granite slabs to prevent dust generation from these obvious dust sources. Structural consolidation, cleaning of paint layers, and protection can then follow. 

It is important to stress that neither sodium silicate nor silico fluoride will improve the performance of a poor, low-strength, dusty concrete floor and if the surface is too porous, there is no way that all the material applied can react with the relatively small quantity of free lime in the concrete surface. All that will happen is that the pores will be filled with non-reacted powder, producing a most unpleasant alkaline dust, which can be very irritating to the skin and eyes when the floor is put into service. 

Solvent-free high-build floor paints are available which can be readily applied with brush, roller or spray to a prepared concrete substrate to give a thickness of 0.10-0.20 mm per coat. Normally, two coats are applied and the first is often lightly dressed with fine sand or carborundum dust to give a non-slip, chemically resistant and durable colored floor, ideal for light industrial traffic conditions (for example, rubber-shod wheels). ... 

Clausen, P.A., Wilkins, C.K. and Wolkoff, P. (1998) Gas chromatographic analysis of free fatty adds and fatty add salts extracted with neutral and addified dichloromethane from office floor dust. Journal of Chromatography A, 814, 161-70. 

Carrier for agricultural chemicals The absorbent properties which make attapulgite useful as a floor absorbent also find extensive use in converting pesticides and herbicides to free-flowing granules or dusts. Many of these chemicals are liquids or sticky pastes which would be difficult or impossible... 

Attention to the basic science of health and safety issues not only provides an insight into the current understanding of a complex and broad-ranging subject, but also helps to eradicate misconceptions. For example, seeing is not believing where air pollution is concerned, nor is exhaust extraction a comprehensive solution to pollution control. Dust does not cease to be a problem when it settles on the floor and fully vulcanized rubber is not necessarily free of toxic hazard. The case where settled dust reduces pedestrian friction can be contrasted with that where mechanical handling creates air pollution. Without doubt the interactions of this science are complex and some procedures designed to solve one problem may merely serve to introduce another. 

Floors have been swept clean and are free from combustible material and dust... 

Typically, when an abatement is performed, the housing is either unoccupied or the occupants are temporarily relocated to lead-safe housing until the abatement has been demonstrated to have been properly completed through dust clearance testing. Carpet in the housing is usually removed as part of the abatement because it is difficult to demonstrate that it is free of lead-based paint hazards. Uncarpeted floors that have not been replaced during the abatement may need to be refinished or sealed in order to... 

The final rule requires renovation firms to use precautions to ensure that all personnel, tools, and other items, including the exteriors of containers of waste, be free of dust and debris before leaving the work area. There are several ways of accomplishing this. For example, tacky mats may be put down immediately adjacent to the plastic sheeting covering the work area floor to remove dust and debris from the bottom of the workers shoes as they leave the work area, workers may remove their shoe covers (booties) as they leave the work area, and clothing and materials may be wet-wiped and/or HEPA-vacuumed before they are removed from the work area. 

It also stands to reason that it will be most difficult to achieve a satisfactory bond on concrete that is loose, flaky, or spalled in any way. Occasionally, curing agents have been used in the concrete that may have a tendency to rise to the surface and create salts that are most difficult to bond to. In this event these salts should be removed before attempting to adhere any type flooring material. All cracks or rough areas on the concrete should be patched prior to proceeding with flooring installations. Naturally the surface should also be free of any dust, dirt. 

Rigid or Hard Materiai Fiooring. Ceramic tile, ceramic mosaic tile, quarry tile, slate, and marble are all examples of the more rigid flooring materials. All can be installed with adhesives. The subfloor or substrate is likely to be either a concrete slab or plywood or similar composition wood material. Once again it is important that these subfloors be clean, diy, and free from dust, dirt, oil, grease, etc. Most installations of these rigid substrates utilize similar adhesives. 

Effective housekeeping measures must be strictly enforced. The laboratory must be kept free of dust-collecting objects, should not be used for storage, and the floors and counters should be cleaned frequently. 

Carefully mix the grab sample and reduce it in size to a convenient laboratory sample by the quartering procedure described in Practice D 346. Perform the quartering operation on a hard, clean surface, free from cracks, and protected from rain, snow, wind, and sun. Avoid contamination with cinders, sand, chips from the floor, or any other material. Protect the sample from loss or gain of moisture or dust. Mix and spread ffie sample in a circular layer, and divide it into quadrants. Combine two opposite quadrants to form a representative reduced sample. If this sample is still too large for laboratory purposes, repeat the quartering operation. In this manner, the sample will finally... 

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