search
arrow-left Previous
Next arrow-right
Q: According to the classification of building limes in IS : 712-1984, Magnesium/dolomitic lime used for finishing coat in plastering, white washing, etc. comes under ______ category.
  • A. Class D
  • B. Class A
  • C. Class C
  • D. Class B
Correct Answer: Option A - Lime are classified into six categories as per (IS : 712-1984). Class A- Eminently hydraulic lime – It is available in hydrated form. This compressive strength of lime and mortar (1 : 3 by weight) should have 1.75 N/mm2 and 7.8 N/mm2 at and 28 days respectively, with such a strength they can be used for structural works such as arches, dome etc. Class B- Semi hydraulic lime– It is available as quick lime or as hydrated lime. The compressive strength of lime and mortar (1 : 3 by weight) should have 1.25 N/mm2 and 1.75 N/mm2 at 14 days and 26 days respectively it is used for masonry work. Class C– Fat lime– It can be used as the finishing coat in plastering, white washing etc. Class D- Magnesium/dolomite lime– It is used as the finishing coat in plastering and white washing. Class E- Kanker lime– It lime produced by burning lime nodules. It can be used for masonry mortar. Class F- Siliceous dolomite lime– It is available in quick and hydrated form. It is generally used as an undercoat and finishing coat of plaster.
A. Lime are classified into six categories as per (IS : 712-1984). Class A- Eminently hydraulic lime – It is available in hydrated form. This compressive strength of lime and mortar (1 : 3 by weight) should have 1.75 N/mm2 and 7.8 N/mm2 at and 28 days respectively, with such a strength they can be used for structural works such as arches, dome etc. Class B- Semi hydraulic lime– It is available as quick lime or as hydrated lime. The compressive strength of lime and mortar (1 : 3 by weight) should have 1.25 N/mm2 and 1.75 N/mm2 at 14 days and 26 days respectively it is used for masonry work. Class C– Fat lime– It can be used as the finishing coat in plastering, white washing etc. Class D- Magnesium/dolomite lime– It is used as the finishing coat in plastering and white washing. Class E- Kanker lime– It lime produced by burning lime nodules. It can be used for masonry mortar. Class F- Siliceous dolomite lime– It is available in quick and hydrated form. It is generally used as an undercoat and finishing coat of plaster.

Explanations:

Lime are classified into six categories as per (IS : 712-1984). Class A- Eminently hydraulic lime – It is available in hydrated form. This compressive strength of lime and mortar (1 : 3 by weight) should have 1.75 N/mm2 and 7.8 N/mm2 at and 28 days respectively, with such a strength they can be used for structural works such as arches, dome etc. Class B- Semi hydraulic lime– It is available as quick lime or as hydrated lime. The compressive strength of lime and mortar (1 : 3 by weight) should have 1.25 N/mm2 and 1.75 N/mm2 at 14 days and 26 days respectively it is used for masonry work. Class C– Fat lime– It can be used as the finishing coat in plastering, white washing etc. Class D- Magnesium/dolomite lime– It is used as the finishing coat in plastering and white washing. Class E- Kanker lime– It lime produced by burning lime nodules. It can be used for masonry mortar. Class F- Siliceous dolomite lime– It is available in quick and hydrated form. It is generally used as an undercoat and finishing coat of plaster.