Pot holes normally occurs in PCC a) True b) False AC cracks by aging and traffic

Question

Pot holes normally occurs in PCC a) True b) False AC cracks by aging and traffic traction: a) True b) False Beach sand is good as fine aggregate in PCC a) True b) False Sea water is good for mixing PCC a) True b) False Fly Ash will the concrete less permeable a) True b) False Crushed concrete is commonly used for making high concrete a)True b)False More than 90 percent of roads in this country are AC roads a) True b) False Most of city and town street roads are PCC roads a) True b) False Crumb rubber is commonly added to AC mix to make it flexible a) True b) False All aggregates for AC mix must be dry a) True b) False Dried craw fish tails are used in AC mix to make it sulfate resistant a) True b)False Wood is homogenous and isotropic a) True b) False Wood is stronger in compression if stress is applied parallel to grain a) True b) False Bending test on wood beam can be used for calculating Modulus of Rupture of wood a) True b) False P

Explanation / Answer

11. Pot holes occur primarily due to failure in asphalt pavement.

   Answer - false

12. AC or Asphalt concrete are mainly used to surface roads which cracks by construction quality, environmental impact, aging and traffic traction.

Answer - true

13.Specification of fine aggregate for PCC - Fine aggregate shall be of coarse sand consisting of hard, sharp and angular grains and shall pass through a screen of 5mm square mesh. Sand shall be of standard specifications, clean and free from dust, dirt and organic matter. Sea sand shall not be used.

Answer - False

14. water specification for PCC - Water shall be clean and free from alkaline and acid matters and suitable for drinking purposes.

Answer - False

15. Fly Ash generally reduces the permeability and adsorption of concrete. By reducing the permeability of chloride ion egress, corrosion of embedded steel is greatly decreased. Also, chemical resistance is improved by the reduction of permeability and adsorption.

Answer - True

16.Crushed concrete is used as gravel for new concrete in most of the projects .

Answer - True

17. Asphalt concrete (commonly called asphalt, blacktop, or pavement in North America, and tarmac or bitumen macadam in the United Kingdom and the Republic of Ireland) is a composite material commonly used to surface roads, parking lots, airports, as well as the core of embankment dams.

Answer - True

18. at locations mainly in streets the roads are of PCC since they are not subjected to heavy loads.

Answer - true

19.Due to the elastic nature of crumb rubber it when used in AC mix it makes it flexible

Answer - true

20.Water is a major cause of premature failure in asphalt. The resulting water damage causes a loss of stiffness and structural strength, due to the loss of adhesion between the aggregate and the bitumen, and/or loss of the cohesion within the bitumen binder.

Answer - True

21- Answer - False

22.Wood is a heterogeneous mixture. It is because all the elements and compounds in a piece of wood are not mixed evenly throughout the wood. One sample of wood may have more water/oxygen than another area, or one sample may have some tree sap, while another may not.Wood is a naturally anisotropic.

Answer - False

23. When stress is applied parallel to the grain the wood is stronger.It is considerably weaker in compression perpendicular to the grain.

Answer -True

24. The Young’s Modulus E of wood and the Modulus of Rupture are found by conducting bending test.

Answer- True

25. Porosity of aggregate affect the abosrption of asphalt.

Answer - True

26. b

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