Consistence of mortars

Dropping Ball Test. See kelly ball TEST. BS 4551 includes a dropping ball test for the consistence of mortars. 

The furnace and thermostatic mortar. For heating the tube packing, a small electric furnace N has been found to be more satisfactory than a row of gas burners. The type used consists of a silica tube (I s cm. in diameter and 25 cm. long) wound with nichrome wire and contained in an asbestos cylinder, the annular space being lagged the ends of the asbestos cylinder being closed by asbestos semi-circles built round the porcelain furnace tube. The furnace is controlled by a Simmerstat that has been calibrated at 680 against a bimetal pyrometer, and the furnace temperature is checked by this method from time to time. The furnace is equipped with a small steel bar attached to the asbestos and is thus mounted on an ordinary laboratory stand the Simmerstat may then be placed immediately underneath it on the baseplate of this stand, or alternatively the furnace may be built on to the top of the Simmerstat box. 

It should be emphasized at this point that the basic requirements of compatibility and consistency of finite elements used in the discretization of the domain in a field problem cannot be arbitrarily violated. Therefore, application of the previously described classes of computational grids requires systematic data transfomiation procedures across interfaces involving discontinuity or overlapping. For example, by the use of specially designed mortar elements necessary communication between incompatible sections of a finite element grid can be established (Maday et ah, 1989). 

Lining vessels and equipment using this type of construction consists of a membrane, acid-resistant bricks or tiles, and chemical-resistant mortar for joining the bricks (tiles) together. 

Parone Explosive. A mixt consisting of 2p K chlorate and lp CS2, prepd in Italy at the end of the last century. On its first exptl firing in a 240mm mortar, it burst the mortar tube Refs 1) Cundill (1889) in MP 6 (1893)... 

According to Stettbacher (Ref 11, Vol 1) the Germans during WWI used a mixt (called Deutscher gesichiessbarer MinensprengstofF ) consisting of K perchlorate 56, DNB 32 and DNN 12%, which was cast-loaded in trench mortar shells, land mines and various bombs, while the French used Perammon (qv) for loading aerial bombs... 

The ballistic mortar method is described briefly in Vol 1, p VII. Basically this test consists of firing a standard weight of expl (usually lOg) in a suspended mortar closed with a tightly fitting steel projectile. The angle of recoil of the mortar is measured and compared to the recoil produced by the same weight of a standard... 

The stratum corneum consists of separated, nonviable, cornified, almost nonpermeable corneocytes embedded into a continuous lipid bilayer made of various classes of lipids, for example, ceramides, cholesterol, cholesterol esters, free fatty acids, and triglycerides [6], Structurally, this epidermis layer is best described by the so-called brick-and-mortar model [7], The stratum corneum is crucial for the barrier function of the skin, controlling percutaneous absorption of dermally applied substances and regulating fluid homeostasis. The thickness of the stratum corneum is usually 10-25 /an, with exceptions at the soles of the feet and the palms, and swells several-fold when hydrated. All components of the stratum corneum originate from the basal layer of the epidermis, the stratum germinativum. 

Calcium carbonate occurs in nature as hmestone in various forms, such as marble, chalk, and coral. It is probably the most widely-used raw material in the chemical industry. It has numerous apphcations, primarily to produce cement, mortars, plasters, refractories, and glass as budding materials. It also is used to produce quicklime, hydrated lime and a number of calcium compounds. It is produced either as powdered or precipitated calcium carbonate. The latter consists of finer particles of greater purity and more uniform size. They also have many important commercial apphcations. Various grades of precipitated calcium carbonate are used in several products, such as textiles, papers, paints, plastics, adhesives, sealants, and cosmetics. 

The red end must be assembled adjacent to the primer (Ref 42, p 86). Ignition cartridge is inserted into fin assembly ahead of the primer. The shaft, in turn, is screwed into the base of projectile, which is made either from pearlitic malleable iron or from steel. Propellant M9 [ See Vol 2, p C35, Table VI (Ref 44)] charge consists of several increments sealed in individual cellophane bags (usually four for 60-min mortars and up to nine for 81-mm weapons). The bags are placed either between or within the blades of fins. 

---