search
arrow-left Previous
Next arrow-right
Q: In which stone masonry, the face joint should not exceed 20 mm in thickness and the percentage of chips used is not to exceed 15% quantity of stones in the masonry?
  • A. Coursed rubble masonry of the first sort
  • B. Ashlar stone masonry
  • C. Random rubble masonry
  • D. Coursed rubble masonry of the second sort
Correct Answer: Option D - Coursed rubble masonry of the second sort– This is the third type of rubble masonry and is also built in courses. It is inferior to the coursed rubble masonry of the first sort but will look similar. • No portion of the dressed surface should be more than 10 mm from a straight edge placed on it. • In this type of work, the face joints should not exceed 20 mm in thickness (10 mm in the first sort). Thus the joints are allowed to be thicker than those in the first sort. The percentage of chips used is not to exceed 15% of the quantity of stones in the masonry. Note– This type of work is more expensive than random rabble work out cheaper than course rubble of the first sort.
D. Coursed rubble masonry of the second sort– This is the third type of rubble masonry and is also built in courses. It is inferior to the coursed rubble masonry of the first sort but will look similar. • No portion of the dressed surface should be more than 10 mm from a straight edge placed on it. • In this type of work, the face joints should not exceed 20 mm in thickness (10 mm in the first sort). Thus the joints are allowed to be thicker than those in the first sort. The percentage of chips used is not to exceed 15% of the quantity of stones in the masonry. Note– This type of work is more expensive than random rabble work out cheaper than course rubble of the first sort.

Explanations:

Coursed rubble masonry of the second sort– This is the third type of rubble masonry and is also built in courses. It is inferior to the coursed rubble masonry of the first sort but will look similar. • No portion of the dressed surface should be more than 10 mm from a straight edge placed on it. • In this type of work, the face joints should not exceed 20 mm in thickness (10 mm in the first sort). Thus the joints are allowed to be thicker than those in the first sort. The percentage of chips used is not to exceed 15% of the quantity of stones in the masonry. Note– This type of work is more expensive than random rabble work out cheaper than course rubble of the first sort.