Madeh Izat Hamakareem - Answers

Following are the common defects that occur in painting :

1. Blistering and Peeling
2. Fading
3. Grinning
4. Chalking
5. Running
6. Sagging
7. Flaking
8. Blooming
9. Wrinkling
10. Flashing
11. Saponification
12. Alligatoring
13. Checking
14. Mildew

For more details, please visit the following link:

https://theconstructor.org/building/paints-decoratives/common-defects-painting/35389/

Segregation of concrete is the separation of cement paste and aggregates of concrete from each other during handling and placement. Segregation also occurs due to over-vibration or compaction of concrete, in which cement paste comes to the top, and aggregates settle at the bottom.

However, honeycombs are hollow spaces and cavities left in concrete mass on the surface or inside the mass where concrete could not reach. These look like honey bees nest. Improper vibration and workability of concrete are the main causes of honeycombs in concrete. Honeycombs which are on sides are visible to naked eyes and can be detected easily as soon shuttering is removed.

To read more on segregation of concrete, please visit the link below:
https://theconstructor.org/practical-guide/segregation-of-concrete-causes-prevention/6892/

To read more on a honeycomb in concrete, please visit the link below:
https://theconstructor.org/practical-guide/honeycombs-in-concrete-and-remedies/6889/

Advantages of AAC Blocks

• Eco-Friendly and Sustainable
• The AAC Blocks are 3 to 4 times lighter than bricks, 30% lighter than that of concrete which helps in reducing the dead load of the building, thereby allowing construction of taller buildings.
• Tiny air pores and thermal mass of blocks provide excellent thermal insulation, thus reducing heating and air conditioning costs of a building.
• As the AAC block is porous in nature, the sound absorption quality is superior. It offers sound attenuation of about 42 dB, blocking out all major sounds and disturbances which makes it ideal for schools, hospitals, hotels, offices, multi-family housing, and other structures that require acoustic insulation.
• AAC blocks can be easily cut, drilled, nailed, milled, and grooved to fit individual requirements.
• Lightweight blocks reduce the mass of a structure, thus decreasing the impact of an earthquake on a building. Non-combustible nature provides an advantage against fires, which commonly accompany earthquakes.
• Construction of AAC Blocks reduces the construction time by 20%. As different sizes of blocks help reduce the number of joints in wall masonry. The lighter weight of the blocks makes it easier and faster to transport, place, and construct the masonry.

Compressive Strength

The strength of ACC block ranges 3 – 4.5 MPa whereas the strength of clay bricks is between 2.5 and 3.5 MPa as per IS 2185 part 3.

For more details, please visit the following link:

https://theconstructor.org/building/buildings/autoclaved-aerated-cement-blocks-aac-properties-advantages/37211/