4
Which among the following are man-made building materials?
(i) . Fly Ash bricks
(ii) . Non-erodible mud plaster
(iii) . Reinforced concrete
(iv) . Calcium silicate plaster
Choose the correct answer from the options given below:
EXPLANATION
Green Building & Sustainable Architecture
- Classification of Man-Made Engineered Building Materials:
- (i) Fly Ash bricks: Man-made manufactured bricks produced through mechanical compaction and autoclaving of industrial fly ash, sand/stone dust, lime, and gypsum.
- (iii) Reinforced concrete (RCC): Man-made composite engineering material embedding high-tensile steel rebars inside a formulated portland cement-aggregate paste.
- (iv) Calcium silicate plaster: Synthetic chemical plaster engineered from slaked lime, silica, and water under hydrothermal pressure.
- (ii) Non-erodible mud plaster is a traditional stabilized natural earthen mix using raw clay, cow dung, and bitumen, classified under vernacular/natural earthen building techniques rather than industrial man-made synthetics.
- Conclusion: i, iii, and iv only (Option 4).
Correct option: (4) i, ili, and iv only
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