Brick, sand-lime

Calcium Silicate Brick. Sand—lime brick is used ia masonry ia the same way as common clay brick. The bricks, molded from a wet mixture of sand and high calcium hydrated lime, are heated under pressure ia a steam atmosphere. Complex hydrosiUcates are formed that give the bricks high dimensional stabiUty (6). 

Building of walls with stones, bricks, sand-lime bricks, aerated concrete bricks... 

Sandarac [9000-57-1] Sandblasting Sand casting Sand cores Sander Cramer test Sandimmun(e) Sand-lime brick Sand mills Sandofan... 

Most carbide acetylene processes are wet processes from which hydrated lime, Ca(OH)2, is a by-product. The hydrated lime slurry is allowed to settle in a pond or tank after which the supernatant lime-water can be decanted and reused in the generator. Federal, state, and local legislation restrict the methods of storage and disposal of carbide lime hydrate and it has become increasingly important to find consumers for the by-product. The thickened hydrated lime is marketed for industrial wastewater treatment, neutrali2ation of spent pickling acids, as a soil conditioner in road constmction, and in the production of sand-lime bricks. 

Hydraulic limes (84) may be used for mortar, stucco, or the scratch coat for plaster. They harden slowly under water, whereas high calcium limes, after slaking with water, harden in air to form the carbonate but not under water at ordinary temperatures. However, at elevated temperatures achieved with steam curing, lime—silica sand mixtures do react to produce durable products such as sand—lime bricks. 

German silver S.,5S 536 Cypress 0.4,5-0.48 29 Sand-lime brick 1.4-2.2 112... 

Mellon Institute on the effect of adding sugar to sand-lime bricks. It was found that the addition of 6% sugar (this amounts to 13 lb. of sugar per 1000 bricks) increased the tensile strength by about 60%. To summarize, it seems that sucrose exerts a beneficial effect on mortar and on sand-lime brick but a detrimental effect on Portland cement. 

Natural stone or artificial stones such as bricks (see Section 5.3.5), sand-lime bricks, aerated concrete bricks (see Section 5.3.2.5) and expanded-clay blocks (see Section 5.3.6.2.3) are used for building walls. 

Sand-lime bricks and aerated concrete blocks ... 

Large-quantities of quicklime are used in the manufacture of sand-lime bricks and aerated concrete blocks. These are construction materials which are manufactured from lime-containing and silicate-containing raw materials and whose strength is due to the hydrothermal reaction of the raw materials to calcium silicates. 

Sand-lime bricks are manufactured by mixing lime, sand and water in a ratio of ca. 1 13 0.7, forming and then hardening in autoclaves at 180°C and 7 to 9 bar. 

Fig. 6.7-8 View into a facility with high-intensity mixers for the processing of sand-lime brick aggregates (courtesy Eirich, Hardheim, Germany)...

Afwillite. A hydrated calcium silicate, 3CaO. 2Si02.3H2O it is formed when Portland cement is hydrated under special conditions and when calcium silicate is autoclaved (as in sand-lime brick manufacture). 

See following types acid-resisting CLAY building concrete facing floor paving perforated sand lime sewer. See also cladding. For Brick Shapes, both for building and for furnace construction, see Fig. 1, and BS 3446 Pt.l. BS 3056 specifies dimensions of refractory bricks for various applications. BS 1902 Pt 3.11 specifies the measurement of dimensions and shapes of refractory bricks and... 

Calcium Silicate Bricks. The approved term (replacing sand-lime brick and flint-lime brick) for bricks made by autoclaving a mixture of sand (or crushed siliceous rock) and lime. Requirements and qualities are specified in B.S. 187, and in the USA, in ASTM C73 for calcium silicate facing bricks. Dimensions are specified in BS 4729. Calcium Stannate. CaSn03 sometimes used as an additive to barium titanate bodies, one effect being to lower the Curie temperature. 

Morta.r, Mortar, principally slaked lime and sand, sets because of the evaporation of water, the deposition of calcium hydroxide, and the absorption of water by the bricks or cement blocks, foUowed by hardening as a result of the absorption and reaction of carbon dioxide. 

Cement and concrete are used in construction on an enormous scale, equalled only by structural steel, brick and wood. Cement is a mixture of a combination of lime (CaO), silica (SiOj) and alumina (AI2O3), which sets when mixed with water. Concrete is sand and stones (aggregate) held together by a cement. Table 15.4 summarises the most important facts. 

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