Friday, December 14, 2012

Masonry Strips.

Masonry strips are rarely used these days, however they can be adopted where good quality sub-strata exists and the raw materials for masonry construction are cheap and abundant. The wall is increased in width by corbelling out the masonry to achieve the required overall foundation width as shown in Fig. 9.3.

It should be noted that it can be important, particularly when using masonry strips in clay or silt sub-strata, to bed the masonry units in mortar and to completely fill all joints.

The reason for filling the joints is mainly to prevent the strip footing acting as a field drain with the water flowing along the surface of the formation level and through the open joints of masonry. The authors have found clear evidence  of induced settlement due to softening of the clay surface below dry random rubble strips (dry random rubble being a term for dry stacking without mortar and not dry meaning no moisture).

Fig. 9.3 Masonry strip footing.

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