Describe any four forms of ‘Rubble Masonry’ with sketches.

Describe any four forms of ‘Rubble Masonry’ with sketches.
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Answer :

1) Dry rubble masonry: - In dry rubble masonry, dressed or undressed stones are used without mortar. Bigger pieces of stones are arranged at the bottom and smaller pieces of stones are used at the top. These walls are generally broader at the bottom and thinner at the top.

These types of masonry is used for the construction of retaining wall, boundary walls of a building.

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2) Uncoursed rubble masonry: - In uncoursed rubble masonry, stones or rubbles are used without any dressing. The mason select the stones at random from heap and lays them in line and plumb so as to form a strong bond.

These types of stone masonry is useful for compound wall of jail, plinth wall, retaining wall etc.

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3) Coursed rubble masonry: - In this type of masonry, stones are placed to level course. Size of stones used are in between 50mm to 200mm. Joints are about 15mm in thickness. C.R. masonry is commonly used in the building construction work where the wall height is low. Care must be taken that the joints must break in different courses.

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4) Squared rubble masonry (uncoursed): - Squared stone means whose edges have been made roughly straight. The stones are roughly dressed and are laid at random on their natural beds so that they are interlocked. The joints should not exceed 13 mm thickness. The gaps are filled by mortar and stone chips. These type of masonry is used for making residential buildings, public buildings, boundary walls etc.

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5) Squared rubble masonry (coursed): - In this type of masonry, semi-dressed stones are used. The stones are arranged in regular courses. Stones of equal height should be used in a course or two to three stones are kept above each other to make up the height of course. Mortar joint should not exceed 13 mm. the stone used in this masonry should be of uniform color.

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