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#Stella architect tutorial advantages disadvantages full#

Reading about the passion of the pioneers in the computing field-some of whom became so entranced by technology that it became an obsession-never fails to inspire me. SEE: Hardware inventory policy (TechRepublic Premium) Focusing on the first true computer geeks at MIT in the late 1950s, the book explores in detail the primitive-quaint, really-hardware specs of the first computers which at the time could do relatively little but which paved the way to much greater feats. Steven Levy's amazing novel Hackers: Heroes of the Computer Revolution is a must-read for any technologist (or layperson) enamored with the computing field. Learn about its background and the advantages it brings. RISC-V is an instruction set architecture which offers innovative operational mechanisms.

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( v) As a refractory material for lining open hearth furnaces. ( ii) For making mortar for masonry works and plastering. The following are the uses of lime in civil works: If there is little or no expansion, but only cracks appear it belongs to class B lime. If within minutes slow expansion and slow disintegration starts it indicates class C lime. Then the balls are placed in a basin of water. By adding sufficient water about 40 mm size lime balls are made and they are left undisturbed for six hours. ( iv) Ball Test: This test is conduct to identify whether the lime belongs to class C or to class B.

Class C lime, if there is no gel formation.

Class B lime, if gel tends to flow down.

If thick gel is formed and after test tube is held upside down it is possible to identify class of lime as indicated below: If effervescence is less and residue is more it indicates impure limestone. Vigorous effervescence and less residue indicates pure limestone. The content is stirred and the test tube is kept in the stand for 24 hours.

#Stella architect tutorial advantages disadvantages full#

( iii) Chemical Test: A teaspoon full of lime is placed in a test tube and dilute hydrochloric acid is poured in it.

From this the amount of calcium carbonate in limestone can be worked out. The loss of weight indicates the amount of carbon dioxide. If weight of sample after cooling is W2, the loss of weight is W2 – W1. ( ii) Heat Test: A piece of dry stone weighing W1 is heated in an open fire for few hours. The presence of lumps gives indication of quick lime and unburnt lime stones. The hydraulic lime gives out earthy smell. Hydraulic lime stones are bluish grey, brown or are having dark colours. ( i) Physical Test: Pure limestone is white in colour. The following practical tests are made on lime stones to determine their suitability: It is available in modular and block form. This is also commonly used for white washing and for finishing coat in plastering.Ĭlass E Lime: It is an impure lime stone, known as kankar. It is used for finishing coat in plastering and for white washing.Ĭlass D Lime: This lime contains large quantity of magnesium oxide and is similar to fat lime. It is used for making mortar for masonry works.Ĭlass C Lime:It is predominantly fat lime, supplied both as quick lime and fat lime. It is supplied as hydrated lime or as quick lime. It is normally supplied as hydrated lime and is commonly used for structural works.Ĭlass B Lime: It contains both hydraulic lime and fat lime. IS 712-1973 classifies lime as class A, B, C, D and E.Ĭlass A Lime: It is predominantly hydraulic lime. The mortar made with such lime is used for inferior works.

Its binding property improves if its fine powder is mixed with sand and kept in the form of heap for a week, before using.

Forms a thin paste with water and do not dissolve in water.

( c) Eminently hydraulic lime (21 to 30% clay content) ( b) Moderately hydraulic lime (11 to 20% clay content) ( a) Feebly hydraulic lime (5 to 10% clay content) Depending upon the percentage of clay present, the hydraulic lime is divided into the following three types: When water is added, it slakes vigorously and its volume increases to 2 to 2.5 times. It is composed of 95 percentage of calcium oxide. The limes are classified as fat lime, hydraulic lime and poor lime: ( i) Fat lime:

When it is mixed with sand it provides lime mortar and when mixed with sand and coarse aggregate, it forms lime concrete. Lime has been used as the material of construction from ancient time. It is an important binding material used in building construction.