By S S Bhavikatti
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Additional info for Basic Civil Engineering (As per the syllabus of RGPV, Bhopal)
3. Why sand is used in mortars? 4. List the properties of good sand. 5. What proportion of cement to sand do you recommend for the following works? (a) Masonry works (b) Plastering masonry (c) Plastering concrete surface (d) Pointing. 6. State the important properties of cement mortar. 7. Where do you use cement mortar? 8. Explain with sketches the methods of grinding lime mortar. 9. Write short notes on mud mortar. 10. Briefly explain tests conducted on mortar. CHAPTER 3 Concrete Plain concrete, commonly known as concrete, is an intimate mixture of binding material, fine aggregate, coarse aggregate and water.
12. Upset (ii) Defects due to Defective Seasoning and Conversion: If seasoning is not uniform, the converted timber may warp and twist in various directions. Sometimes honey combining and even cracks appear. This type of defects are more susceptible in case of kiln seasoning. In the process of converting timber to commercial sizes and shapes the following types of defects are likely to airse: chip marks, torn grain etc. (iii) Defects due to Fungi and Insects Attack: Fungi are minute microscopic plant organism.
B) Compaction by Vibrators: Concrete can be compacted by using high frequency vibrators. Vibration reduces the friction between the particles and set the motion of particles. As a result entrapped air is removed and the concrete is compacted. The use of vibrators reduces the compaction time. When CONCRETE 43 vibrators are used for compaction, water cement ratio can be less, which also help in improving the strength of concrete. Vibration should be stopped as soon as cement paste is seen on the surface of concrete.