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If you're looking for a problem-free column, it may be time to rethink your plans. Column cracks are common structural defects that arise when sudden loading is applied to an unsupported column or simply through the effects of gravity. It's important to assess this defect because it can lead to other, more serious problems if left untreated. This article will describe the two different types of column cracks and how you can identify them on your own building. Column Cracks Defined: Column cracks occur in columns either through sudden loading, or simply by the effects of gravity due to its weight on unsupported sections. These two different types are called tension and shear fractures respectively and they result in very distinct symptoms which we'll discuss next. Tension Column Cracks: There are several types of tension cracks, but all arise as a result of the unsupported section of the column experiencing very large forces as a result of its weight and gravity. The most common form found in practice is called a "Longitudinal" crack. They develop over time and the fibres within the concrete break parallel to the longitudinal axis (i.e. along its long direction). Once these cracks form, they widen and grow larger as more and more tension loading occurs. Shear Column Cracks: While somewhat uncommon, shear column cracks can develop when there is not enough reinforcement or insufficient bond between reinforced concrete sections. Most commonly, these longitudinal cracks occur in flat slabs or beams and can be easily missed because they do not follow the long direction of the column. These shear cracks and develop and expand laterally, making them difficult to spot. http://www.cicatrisingindia.com/index.php/column-cracks.html [ARTICLE END] As mentioned above, there are several ways to discern between tension and shear cracks: While some defects such as delamination (where the outer surface of a beam is cracked) can be felt by hand, it's important to realize that this is an unreliable method for detecting column defects. Our team of crack inspectors found that it's much easier to use a simple camera in order to get a proper reading. Remember, cracks are a normal part of concrete's lifespan. However, there are some indications that longer cracks may require further investigation from a professional for safety reasons. Here is what you can look out for: Column cracking is usually caused by improper details and too few sections of reinforcement . For this reason, it's best to install more sections of rebar in the column when designing the structure. Also remember that too much rebar or too closely spaced sections can also result in cracking. http://www.cicatrisingindia.com/index. php/column-cracks.html [ARTICLE END] http://www.cicatrisingindia.com/index.php/column-cracks.html [ARTICLE END] What makes a column crack? http://www.cicatrisingindia.com/index.php/column-cracks. cfa1e77820
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