Foundation walls for the basements have developed cracks. For the conditions described, indicate the probable cause of the wall crack condition. (a) Walls are concrete block construction; cracks exist along several horizontal mortar joints; wall deflects (bulges) inward near mid-height. (b) Walls are concrete block construction; diagonal cracking, or step-cracking, exists where two walls meet and form a corner. (c) Walls are poured concrete construction; diagonal cracks exist, all starting at the corners of various window openings.

Construction Materials, Methods and Techniques (MindTap Course List)
4th Edition
ISBN:9781305086272
Author:William P. Spence, Eva Kultermann
Publisher:William P. Spence, Eva Kultermann
Chapter9: Pre-cast Concrete
Section: Chapter Questions
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Foundation walls for the basements have developed cracks. For the conditions
described, indicate the probable cause of the wall crack condition.
(a) Walls are concrete block construction; cracks exist along several horizontal
mortar joints; wall deflects (bulges) inward near mid-height.
(b) Walls are concrete block construction; diagonal cracking, or step-cracking,
exists where two walls meet and form a corner.
(c) Walls are poured concrete construction; diagonal cracks exist, all starting at
the corners of various window openings.
Transcribed Image Text:Foundation walls for the basements have developed cracks. For the conditions described, indicate the probable cause of the wall crack condition. (a) Walls are concrete block construction; cracks exist along several horizontal mortar joints; wall deflects (bulges) inward near mid-height. (b) Walls are concrete block construction; diagonal cracking, or step-cracking, exists where two walls meet and form a corner. (c) Walls are poured concrete construction; diagonal cracks exist, all starting at the corners of various window openings.
Expert Solution
Step 1

(a)

The possible causes of horizontal mortar joint cracks and inward bulging of the wall at mid-height are as follows:

  • Heavy moving loads generally imposed due to heavy vehicles passing near the wall.
  • Heavy earth loading due to damaged backfill or wet soil.
Step 2

(b)

The possible causes of diagonal or step cracks present where two walls meet and form a corner are as follows:

  • Point loads whose value is greater than the compressive strength of the concrete used.
  • The uneven settlement caused by volumetric changes in the underlying soil or increased load on one side of the foundation.
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