Basic Civil Engineering (As per the syllabus of RGPV, by S S Bhavikatti

By S S Bhavikatti

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The difference between the two readings indicate the expansion of the cement due to the presence of unburnt lime. This value should not exceed 10 mm. (d) Crushing Strength Test: For this 200 gm of cement is mixed with 600 gm of standard sand confirming to IS 650–1966. After mixing thoroughly in dry condition for a minute distilled potable P + 3 percentage is added where P is the water required for the standard consistency. They are 4 mixed with trowel for 3 to 4 minutes to get uniform mixture. 6 mm size (Area 5000 mm2) kept on a steel plate and prodded with 25 mm standard steel rod 20 times within 8 seconds.

Compressive strength Water used for making concrete should be clean. It activates the hydration of cement and forms plastic mass. As it sets completely concrete becomes hard mass. Water gives workability to concrete which means water makes it possible to mix the concrete with ease and place it in final position. More the water better is the workability. However excess water reduces the strength of concrete. 1 shows the variation of strength of concrete with water cement ratio. 6 is used for hand mixing.

Medullary Rags: These are thin radial fibres extending from pith to cambium layer. They hold annular rings together. In some of trees they are broken and some other they may not be prominent. (b) Endogeneous Trees: These trees grow inwards. Fresh fibrous mass is in the inner most portion. Examples of endogenous trees are bamboo and cane. They are not useful for structural works. (ii) Classification Based on Modulus of Elasticity: Young’s modulus is determined by conducting bending test. 8 kN/mm2.

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