Resistant Masonry Applications

Sheppard, W.L., Jr., Applications of Chemical Resistant Masonry in Liquid Waste... 

Corrosion resistant masonry is generally more commonly used in floors, trenches, and pits or catch basins. Other applications are chimneys, basically fire brick, and the lining of process vessels. Both are highly specialized and are covered in other chapters in detail. 

The use of silica brick in chemical-resistant masonry is limited, because of high cost, to applications requiring a high degree of chemical resistance where traditional acid brick cannot be used, such as concentrated phosphoric acid free of fluorine. Silica brick, however, cannot be used in strong alkaline exposures or any concentrations of hydrofluoric acid. As with acid brick, its main function is to provide a barrier to abrasion and to protect other membranes or structures from chemical attack. Because brick porosity may be as high as 16%, silica brick is backed by an impermeable material and a support structure. 

Early chemical-resistant masonry usage of silica bricks employed them as refractories for steel furnace or coke oven applications. Typically these bricks had up to 3.5% flux additions (usually CaO), promoting bond formation at lower firing temperatures. 

Granite is most commonly used in applications where physical stability, durability and strength in a mildly acid environment are required. Historical uses of granite as a chemically resistant masonry include its use as flooring in places where "oil of vitriol" (sulfuric acid) was made. In the nineteenth century, granite blocks hollowed out to form tubs were employed by steel wire companies to hold dilute HCI baths for pickling off mill scale from the wire. Some of these tubs are still in use today. 

Applications of Chemically Resistant Masonry in Liquid Waste Handling, Materials... 

Chemically Resistant Masonry, Walter Lee Sheppard, Jr. Compressors and Expanders Selection and Application for the Process Industry, Heinz P. Bloch, Joseph A. Cameron, Frank M. Danowski, Jr., Ralph James, Jr.,... 

AH masonry must be reinforced and details typically used for reinforced masonry construction arc applicable to blast resistant design. 

To quote the editor CRM may be defined as "a structure composed of non-metallic, chemically inert masonry units such as brick, stone, block or other aggregate bonded together with a mortar or mortars of adequate adhesion to the units and possessing suitable chemical and thermal resistance for the anticipated exposure. Such a structure may be assembled from units and mortars of a single type or from a combination of several different types of such units and mortars in order to achieve optimum and most economically satisfactory results." CRM structures as such comprise three components (1) Masonry units such as brick or tile (2) Mortars to bond them together, and (3) Membranes to attain a liquid-tight, fully resistant system. All of these components are available in various forms and are produced from many different materials. All three components must be chosen to meet both the environmental conditions and the design requirements of each application. 

Acid Brick Acid brick, also called acid resistant or acid proof brick (covered by ASTM C279), are of two major types (1) Red shale, the predominant brick in CRM construction and (2) Fireclay, another common brick in CRM applications. These two acid brick are the most widely used masonry units in CRM structures and linings, including floors, trenches, sumps, vessels and chimney... 

The integrity of any lining system depends not only on the quality of the material used but also on the quality of the actual installation. Therefore, an experienced specialty contractor is required to ensure a high-quality installation. Typically, a masonry contractor experienced in the special handling of acid-resistant brickwork construction will have the expertise to follow the block supplier s application instructions. 

Polystyrene foam (PS) holds much of the sheathing market. In masonry and brick walls, PS foams are mainly used because of their better moisture resistance. In cavity walls, loose fill PS is used, while exterior wall applications, which have no limitation on space, use low-cost expanded PS. 

Chem. Descrip. Acrylic prepolymer emulsion Uses Acrylic for interior flat latex paints, primer sealers, exterior masonry, exterior wood stains, caulks, sealants, and mastics Features Prevents paint blistering/peeling soon after applic./before the paint film is leached of its water exiraclables provides alkali resist., pig-... 

The application of composite materials allows to counterbalance such a mechanism, thus conveying bending resistance to the stretch of unit height on the top of the panel, turned into a beam of FRP-reinforced masonry. 

Among these resin fortified oil based paints are included the alkyds, epoxy esters, oil modified urethanes, etc. These paints may be formulated as airdrying or baking types, and with suitable pigments be formulated to be resistant to a variety of moisture and chemical fume environments, as well as application over wood, metal, and masonry substrates. These paints have the following advantages ... 

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