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Chapter 9: Problem 19

Identify which contributes for strengthening of lime mortar structures and contributes for weaken- ing of RCC structures. (a) usage of water containing dissolved salts (b) addition of lime (c) absorption of \(\mathrm{CO}_{2}\) from atmospheric air (d) both \((2)\) and \((3)\)

Short Answer

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a) Water containing dissolved salts b) Addition of lime c) Absorption of CO2 from atmospheric air d) Both (2) and (3) Answer: d) Both (2) and (3)

Step by step solution

01

Analyze the effects of water containing dissolved salts

Water containing dissolved salts can lead to an increase of harmful ions such as chloride and sulfate ions. These ions can cause the corrosion of steel reinforcement in RCC structures, thereby weakening them. On the other hand, these dissolved salts might not affect lime mortar structures.
02

Analyze the effects of addition of lime

Adding more lime to lime mortar structures can improve their strength and durability due to the formation of calcium carbonate. However, adding lime to RCC can reduce the strength of the concrete by providing weaker bonds in the cement.
03

Analyze the effects of absorption of CO2 from atmospheric air

The absorption of CO2 from the atmospheric air can contribute to the carbonation process in lime mortar structures, which results in the formation of calcium carbonate, thus increasing their strength. This absorption of CO2 doesn't have the same strengthening effect on RCC structures. In fact, carbonation in RCC structures can lead to the corrosion of steel reinforcement, causing weakening.
04

Evaluate options and determine the correct answer

Based on the above analysis, we can conclude that: - Option (a) is incorrect because dissolved salts in water weakens RCC structures and doesn't strengthen lime mortar structures. - Option (b) is correct because the addition of lime strengthens lime mortar structures and weakens RCC structures. - Option (c) is correct because the absorption of CO2 from atmospheric air strengthens lime mortar structures and weakens RCC structures. - Option (d) combines options (b) and (c) which are both correct, so this is the correct answer. In conclusion, the correct answer is (d) both (2) and (3).

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