Hand Mixing Of Concrete

Hand Mixing Of Concrete The process of mixing the various ingredients of concrete by manual labour, is called hand mixing of concrete. Hand mixing of concrete may be resorted to at small projects which require limited quantity of concrete. Now-a-days machine mixing of concrete i...

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Chemical Classification of Rocks

Chemical Classification of Rocks The Chemical Classification of Rocks are, (a) Siliceous rocks : These rocks have silica (and, quartz and flint) as their principal constituent and are very hard and durable, unaffected by weathering. Chief types of siliceous rocks are Granites, Tr...

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WaterProofing Concrete, Walls and Floors

WaterProofing Concrete, Walls and Floors A badly made concrete cannot be made waterproofing, to the penetration of water by any admixtures. The first requisite for waterproofing concrete, is to obtain a dense concrete with well-proportioned non-porous aggregates, and with low wat...

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Civil Engineering Terms and Definitions

Civil Engineering Terms and Definitions Some of the basic Civil Engineering Terms and Definitions are listed below, Arcade : A series of arches with their supporting columns or piers. Arris : The meeting of two surfaces producing an external angle. Base: Base is immediately above...

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Damp Proof Course – Damp Proofing

Damp Proof Course One of the following specifications may be adopted for a damp proof course, according to the type of the construction and the nature of the ground: (j) Two courses of dense bricks in 1. : 3 cement mortar. Bricks should have a water absorption of not more than 4....

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Test for Stones

Test for Stones Some of the simple test for stones are listed below, (a) Crushing test for stones: The crushing strength of a stone greatly depends upon its texture and specific gravity. A stone of even texture arid of specific gravity greater than 2.7 can take heavy loads. Safe ...

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Grading of Aggregates – Aggregate Grading

Grading of Aggregates Grading of Aggregates is one which is made up of stones of different sizes, ranging from large to small (inclusive of sand) so as to have minimum of air voids (and that will have maximum density) when mixed together. In grading of aggregates, the voids in t...

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Guniting or Shotcrete or Shot Concrete

Guniting or Shotcrete Guniting or Shotcrete: An intimate mixture of cement, sand (or fine aggregate) and water is forced or ejected through a cement-gun and shot into place by means of compressed air. The usual equipment consists of a compressor, spray nozzle and flexible hose pi...

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Geological Classification of Rocks

Geological Classification of Rocks It is estimated that three-fourth of the land area of the globe is underlain by sedimentary rocks and the other fourth by igneous and metamorphic rocks. Main three geological classification of rocks are, : Igneous rocks: Are of volcanic origin, ...

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Cement Mortar – Preparation of Cement Mortar

Cement Mortar The unit of measurement for cement is a bag of cement weighing 50 kg and this is taken as 0.035 cu. m. Sand is measured in boxes of size 25x35x40 cm on the basis of its dry volume. Cement mortar shall be used as soon as possible after mixing and before it has [&hell...

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