# How Many Components Are There In Cement Concrete Flooring?

Building Construction Questions and Answers – Types of Ground Floors – 1

• This set of Building Construction Multiple Choice Questions & Answers (MCQs) focuses on “Types of Ground Floors – 1”.
• 1. The thickness of the mortar bed on which the brick flooring is laid is _ a) 8 mm b) 10 mm c) 12 mm d) 15 mm

Answer: c Explanation: Brick flooring is used in cheap construction, especially in those places where good bricks are available. The method of preparing the base course varies from place to place. The thickness of the mortar bed on which the brick flooring is laid is 12 mm.

1. 2. In muram flooring, the thickness of the layer of muram laid over the prepared subgrade is _ a) 15 mm b) 15 cm c) 6 mm d) 6 cm

Answer: b Explanation: In muram flooring, the thickness of the layer of muram laid over the prepared subgrade is 15 cm. Over this layer, a layer of fine muram of thickness 2.5 cm is spread and sprinkled with water. After it, the surface is rammed well.

The method of construction of muram flooring is very easy.3. Mud and muram floorings can be used in both low-cost housing as well as high-cost housing. a) True b) False View Answer Answer: b Explanation: Mud and muram floorings are cheap and easy to construct. They are used only in low-cost housing. They have good thermal insulation property which helps them to remain cool in summer and sufficiently warm in winter.

Note: Join free Sanfoundry classes at or 4. The thickness of the flagstone used in flagstone flooring is _ a) 0.5-1 cm b) 0.5-1 mm c) 2-4 cm d) 2-4 mm View Answer Answer: c Explanation: Flagstone is a laminated sandstone of thickness 2-4 cm available in the form of stone slabs.

1. These stone slabs can be squares of size 30 cm x 30 cm, 45 cm x 45 cm or 60 cm x 60 cm or they can be rectangular of size 45 cm x 60 cm.5.
2. The mortar used in flagstone flooring has cement and sand in the ratio _ a) 1:2 b) 1:3 c) 1:4 d) 1:6 View Answer Answer: b Explanation: In flagstone flooring, while laying the slabs a string is stretched between two corner slabs.

Other slabs are then laid in such a way that their tops touch this string. If a particular slab falls below the string level, then it is re-laid with the help of a fresh layer of mortar. The mortar used in flagstone flooring has cement and sand in the ratio 1:3.6.

Which of the following reasons is not responsible for the preference of non-monolithical construction over monolithical construction in cement concrete flooring? a) Development of hair cracks in monolithical construction b) Damaging of the topping in monolithical construction c) Smaller overall thickness in monolithical construction d) Slow work progress in monolithical construction View Answer Answer: c Explanation: In cement concrete flooring, non-monolithical construction is preferred over monolithical construction because of the following disadvantages of monolithical construction.

These are the development of hair cracks, damaging of the topping and slow work progress in monolithical construction. However, the only advantage of monolithical construction is that in this, good bonds are formed which result in smaller overall thickness.7.

How many components are there in cement concrete flooring? a) Two b) Three c) Four d) Six View Answer Answer: a Explanation: The floor in cement concrete flooring consists of two components. These are base concrete and topping surface. The topping surface is also known as the wearing surface. The two components of the floor can be constructed in two ways – monolithically or non-monolithically.8.

The base course in cement concrete flooring is made of _ coarse aggregate. a) 40% b) 60% c) 30% d) 70% View Answer Answer: b Explanation: The base course in cement concrete flooring is made of lime concrete containing 40 % mortar and 60 % coarse aggregate.

The nominal size of the coarse aggregate is generally 40 mm. The mortar used has lime and sand in the ratio 1:2.9. The minimum thickness of the granolithic finish, when laid over a hardened surface, is _ a) 35 mm b) 35 cm c) 15 mm d) 15 cm View Answer Answer: a Explanation: Granolithic finish is composed of rich concrete made with a very tough quality coarse aggregate like basalt, granite etc.

The minimum thickness of the granolithic finish, when laid over a hardened surface is 35 mm while when laid monolithically with the top concrete, it is 25 mm.10. Which of the following types of flooring is a decorative flooring? a) Cement concrete flooring b) Terrazzo flooring c) Mud flooring d) Muram flooring View Answer Answer: b Explanation: Terrazzo flooring is a decorative flooring.

1. It has good wearing property.
2. Because of this, it is extensively used in residential buildings, offices, hospitals and other public buildings.
3. It is laid in thin layers over the concrete topping.11.
4. The ratio of cement and marble in terrazzo is _ a) 1:3/4 to 1:3 b) 1:3/4 to 1:4 c) 1:5/4 to 1:2 d) 1:5/4 to 1:4 View Answer Answer: c Explanation: Terrazzo is a specially prepared concrete surface.

The ratio of cement and marble in terrazzo is 1:5/4 to 1:2. The cement may be white or grey. However, colour can be added to the white cement in order to set the desired tint.12. The size of the marble chips used in terrazzo flooring varies from _ a) 2-4 mm b) 3-6 mm c) 8-10 mm d) 12-15 mm View Answer Answer: b Explanation: The size of the marble chips used in terrazzo flooring varies from 3-6 mm.

• Marble chips of different colors are used.
• They are exposed by grinding operation once the surface has set.
• Terrazzo flooring is comparatively more expensive.13.
• In mosaic flooring, the surface is rubbed with _ to make it smooth and polished.
• A) Pumice stone b) Aerosol c) Gravel d) Acetone View Answer Answer: a Explanation: In mosaic flooring, broken tiles of china glazed or of marble are used.
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They are cut in desired shapes and sizes and arranged in various patterns. In this type of flooring, pumice stone is used to make the surface smooth and polished.14. Which of the following is used as an alternative to terrazzo flooring when the floor needs to be laid quickly? a) Mosaic flooring b) Flagstone flooring c) Tiled flooring d) Cement concrete flooring View Answer Answer: c Explanation: Tiled flooring is used as an alternative to terrazzo flooring when the floor needs to be laid quickly.

It is constructed from square or hexagonal shapes made of cement concrete, clay or terrazzo. It is commonly used in schools, offices, hospitals etc.15. In the figure given below, A represents _ a) Mortar b) Flagstone c) Brick d) Glass View Answer Answer: b Explanation: The above figure shows flagstone flooring.

In the figure, A represents flagstone. B represents mortar bed and C represents batten. The flagstones are the stone slabs available in particular sizes. This kind of work is also known as paving. Sanfoundry Global Education & Learning Series – Building Construction.

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#### What are the components of concreting?

What are the components of concrete? – Concrete is composed of three components. In order for concrete to be set, it needs these three ingredients: water; aggregate (rock, sand, or gravel); and Portland cement. When combined with water and aggregates, cement, which is typically in powder form, serves as a binding agent.

## What type of concrete is used under a floor?

Cement Concrete Flooring Cement Concrete Flooring is commonly used both in residential as well as public buildings. The method of laying cement concrete flooring on ground floor of a building can be broadly divided in the following steps. (i) Preparation of sub-base: The earth filling in plinth is consolidated thoroughly so as to ensure that no loose pockets are left in the whole area.

1. A 10 to 15 cm.
2. Thick layer of clean coarse sand is then spread over the whole area.
3. The sand layer a consolidated and dressed to the required level and slope.
4. Ii) Laying of base concrete: The base concrete used under floors may be cement concrete or lime concrete laid to a thickness varying from 75 to 10 cm.

In case of cement concrete, the mix commonly used is 1:5:10 (1 cement: 5 sand : 10 stone or over burnt brick aggregates 40 mm. nominal size). Lime concrete, if used, should be made up out of 40 mm. nominal size stone/over burnt brick aggregate and 40% mortar comprising of 1 lime : 2 sand/surkhi or 1 lime : 1 surkhi/ash : 1 sand.

1. The base concrete layer is deposited over the whole area, thoroughly lamped and levelled to a rough surface.
2. Cement Concrete Flooring (iii) Laying the topping: When the base concrete layer has fully set and hardened, its surface is thoroughly cleaned and the entire area is divided into rectangular or square panels by use of 4 mm, thick glass strips or 5 mm, thick plain asbestos strips.

The size of panel is basically governed by the location of floor (exposed or indoor), temperature and other climatic conditions, thickness of topping and proportions of ingredients in concrete mix. etc. In general, the area of one such panel should not preferably be more than 2 sq.m.

The surface of base concrete should be made damp and applied with a coat of neat cement slurry prior to laying the topping., The rough finished surface of base concrete coated with cement slurry ensures adequate bond between the base and the topping. The cement concrete topping, normally consisting of 1:2:4 (1 cement :2 sand : 4 stone aggregate) is then laid in required thickness in one operation in the panels.

The concrete is spread evenly by using a straight edge and the surface is thoroughly tamped and floated with wooden floates till the cream of the mortar comes at top. The surface is then smoothened and finally finished by means of steel trowels. In case glass or plain asbestos strips are not required, the panels are formed by use of wooden or angle iron battens.

The battens should have depth equivalent to that of concrete topping. The surface of the battens which is to come in contact with concrete, is coated with raw linseed oil before concreting. Concrete for the topping is then laid in alternate panels and finished as described above. The battens used for forming panels are removed next day and the topping concrete laid in the alternate panels.

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In case the cement concrete flooring is to be laid over R.C.C. slab, it is usual to allow the slab concrete to harden and then lay the flooring. Prior to laying, the slab top is cleaned of all dirt, dust, loose particles, mortar droppings and debris etc.

1. And the flooring laid as described under the sub-head ‘laying of topping’ above.
2. In order to prevent the tendency of separation of the.
3. Cement concrete flooring from the R.C.C.
4. Slab, a 20 mm.
5. Thick cushioning layer of lime mortar (1 lime : 2 sand/surkhi or/lime : 1 surkhi/sand) or 50 to 75 mm.
6. Thick lime concrete is sometimes provided between the R.C.C.

slab and the cement concrete flooring, If the working conditions permit, the flooring can also be laid monolithically over the R.C.C. slab while the slab concrete is still green. In this case, the slab concrete is roughened with wire brushes so as to ensure a good bond between the base and the flooring layer.

It is non-absorbent and thus it is very useful for water stores. It is durable and hence it is commonly used in kitchens, bathrooms, schools, hospitals, drawing rooms etc. cement concrete flooring smooth and pleasing in appearance. It is economical and has the advantages of costlier types of floors. It possesses good wearing properties and can be easily maintained clean.

Demerits of cement concrete flooring :

Detects in carelessly made floor cannot be rectified, and as such, it requires proper attention while laying. Cement concrete flooring cannot be satisfactorily repaired by patch work.

: Cement Concrete Flooring

#### What is the mix ratio of cement and lime in concrete?

Cement Concrete Flooring Cement Concrete Flooring is commonly used both in residential as well as public buildings. The method of laying cement concrete flooring on ground floor of a building can be broadly divided in the following steps. (i) Preparation of sub-base: The earth filling in plinth is consolidated thoroughly so as to ensure that no loose pockets are left in the whole area.

• A 10 to 15 cm.
• Thick layer of clean coarse sand is then spread over the whole area.
• The sand layer a consolidated and dressed to the required level and slope.
• Ii) Laying of base concrete: The base concrete used under floors may be cement concrete or lime concrete laid to a thickness varying from 75 to 10 cm.

In case of cement concrete, the mix commonly used is 1:5:10 (1 cement: 5 sand : 10 stone or over burnt brick aggregates 40 mm. nominal size). Lime concrete, if used, should be made up out of 40 mm. nominal size stone/over burnt brick aggregate and 40% mortar comprising of 1 lime : 2 sand/surkhi or 1 lime : 1 surkhi/ash : 1 sand.

The base concrete layer is deposited over the whole area, thoroughly lamped and levelled to a rough surface. Cement Concrete Flooring (iii) Laying the topping: When the base concrete layer has fully set and hardened, its surface is thoroughly cleaned and the entire area is divided into rectangular or square panels by use of 4 mm, thick glass strips or 5 mm, thick plain asbestos strips.

The size of panel is basically governed by the location of floor (exposed or indoor), temperature and other climatic conditions, thickness of topping and proportions of ingredients in concrete mix. etc. In general, the area of one such panel should not preferably be more than 2 sq.m.

The surface of base concrete should be made damp and applied with a coat of neat cement slurry prior to laying the topping., The rough finished surface of base concrete coated with cement slurry ensures adequate bond between the base and the topping. The cement concrete topping, normally consisting of 1:2:4 (1 cement :2 sand : 4 stone aggregate) is then laid in required thickness in one operation in the panels.

The concrete is spread evenly by using a straight edge and the surface is thoroughly tamped and floated with wooden floates till the cream of the mortar comes at top. The surface is then smoothened and finally finished by means of steel trowels. In case glass or plain asbestos strips are not required, the panels are formed by use of wooden or angle iron battens.

The battens should have depth equivalent to that of concrete topping. The surface of the battens which is to come in contact with concrete, is coated with raw linseed oil before concreting. Concrete for the topping is then laid in alternate panels and finished as described above. The battens used for forming panels are removed next day and the topping concrete laid in the alternate panels.

In case the cement concrete flooring is to be laid over R.C.C. slab, it is usual to allow the slab concrete to harden and then lay the flooring. Prior to laying, the slab top is cleaned of all dirt, dust, loose particles, mortar droppings and debris etc.

And the flooring laid as described under the sub-head ‘laying of topping’ above. In order to prevent the tendency of separation of the. cement concrete flooring from the R.C.C. slab, a 20 mm. thick cushioning layer of lime mortar (1 lime : 2 sand/surkhi or/lime : 1 surkhi/sand) or 50 to 75 mm. thick lime concrete is sometimes provided between the R.C.C.

slab and the cement concrete flooring, If the working conditions permit, the flooring can also be laid monolithically over the R.C.C. slab while the slab concrete is still green. In this case, the slab concrete is roughened with wire brushes so as to ensure a good bond between the base and the flooring layer.

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It is non-absorbent and thus it is very useful for water stores. It is durable and hence it is commonly used in kitchens, bathrooms, schools, hospitals, drawing rooms etc. cement concrete flooring smooth and pleasing in appearance. It is economical and has the advantages of costlier types of floors. It possesses good wearing properties and can be easily maintained clean.

Demerits of cement concrete flooring :

Detects in carelessly made floor cannot be rectified, and as such, it requires proper attention while laying. Cement concrete flooring cannot be satisfactorily repaired by patch work.

: Cement Concrete Flooring

### What are the merits of cement concrete flooring?

Cement Concrete Flooring Cement Concrete Flooring is commonly used both in residential as well as public buildings. The method of laying cement concrete flooring on ground floor of a building can be broadly divided in the following steps. (i) Preparation of sub-base: The earth filling in plinth is consolidated thoroughly so as to ensure that no loose pockets are left in the whole area.

• A 10 to 15 cm.
• Thick layer of clean coarse sand is then spread over the whole area.
• The sand layer a consolidated and dressed to the required level and slope.
• Ii) Laying of base concrete: The base concrete used under floors may be cement concrete or lime concrete laid to a thickness varying from 75 to 10 cm.

In case of cement concrete, the mix commonly used is 1:5:10 (1 cement: 5 sand : 10 stone or over burnt brick aggregates 40 mm. nominal size). Lime concrete, if used, should be made up out of 40 mm. nominal size stone/over burnt brick aggregate and 40% mortar comprising of 1 lime : 2 sand/surkhi or 1 lime : 1 surkhi/ash : 1 sand.

• The base concrete layer is deposited over the whole area, thoroughly lamped and levelled to a rough surface.
• Cement Concrete Flooring (iii) Laying the topping: When the base concrete layer has fully set and hardened, its surface is thoroughly cleaned and the entire area is divided into rectangular or square panels by use of 4 mm, thick glass strips or 5 mm, thick plain asbestos strips.

The size of panel is basically governed by the location of floor (exposed or indoor), temperature and other climatic conditions, thickness of topping and proportions of ingredients in concrete mix. etc. In general, the area of one such panel should not preferably be more than 2 sq.m.

The surface of base concrete should be made damp and applied with a coat of neat cement slurry prior to laying the topping., The rough finished surface of base concrete coated with cement slurry ensures adequate bond between the base and the topping. The cement concrete topping, normally consisting of 1:2:4 (1 cement :2 sand : 4 stone aggregate) is then laid in required thickness in one operation in the panels.

The concrete is spread evenly by using a straight edge and the surface is thoroughly tamped and floated with wooden floates till the cream of the mortar comes at top. The surface is then smoothened and finally finished by means of steel trowels. In case glass or plain asbestos strips are not required, the panels are formed by use of wooden or angle iron battens.

The battens should have depth equivalent to that of concrete topping. The surface of the battens which is to come in contact with concrete, is coated with raw linseed oil before concreting. Concrete for the topping is then laid in alternate panels and finished as described above. The battens used for forming panels are removed next day and the topping concrete laid in the alternate panels.

In case the cement concrete flooring is to be laid over R.C.C. slab, it is usual to allow the slab concrete to harden and then lay the flooring. Prior to laying, the slab top is cleaned of all dirt, dust, loose particles, mortar droppings and debris etc.

• And the flooring laid as described under the sub-head ‘laying of topping’ above.
• In order to prevent the tendency of separation of the.
• Cement concrete flooring from the R.C.C.
• Slab, a 20 mm.
• Thick cushioning layer of lime mortar (1 lime : 2 sand/surkhi or/lime : 1 surkhi/sand) or 50 to 75 mm.
• Thick lime concrete is sometimes provided between the R.C.C.

slab and the cement concrete flooring, If the working conditions permit, the flooring can also be laid monolithically over the R.C.C. slab while the slab concrete is still green. In this case, the slab concrete is roughened with wire brushes so as to ensure a good bond between the base and the flooring layer.

It is non-absorbent and thus it is very useful for water stores. It is durable and hence it is commonly used in kitchens, bathrooms, schools, hospitals, drawing rooms etc. cement concrete flooring smooth and pleasing in appearance. It is economical and has the advantages of costlier types of floors. It possesses good wearing properties and can be easily maintained clean.

Demerits of cement concrete flooring :

Detects in carelessly made floor cannot be rectified, and as such, it requires proper attention while laying. Cement concrete flooring cannot be satisfactorily repaired by patch work.

: Cement Concrete Flooring