The recommended grade of tar for grouting purpose is A. RT-1 B. RT-2 C. RT-3 D. RT-5

RT-1
RT-2
RT-3
RT-5

The correct answer is: A. RT-1

RT-1 is a grade of tar that is specifically designed for grouting purposes. It is a bituminous material that is made from coal tar and is a good choice for grouting because it is water-resistant and has good adhesive properties.

RT-2 is a grade of tar that is used for roofing and waterproofing. It is not as water-resistant as RT-1 and does not have as good adhesive properties.

RT-3 is a grade of tar that is used for paving and road construction. It is not as water-resistant as RT-1 or RT-2 and does not have as good adhesive properties.

RT-5 is a grade of tar that is used for industrial applications. It is not as water-resistant as RT-1, RT-2, or RT-3 and does not have as good adhesive properties.

In conclusion, the recommended grade of tar for grouting purpose is RT-1.

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