What is hollow?

What Does hollow Mean

The notion of hollowness is linked to the existence of a hole or hole . It is, therefore, that place that remains empty within a solid , a peculiarity that can be produced by natural conditions or that can be generated artificially.

The bones of the human body, for example, have different levels of hollowness. When the cavities are numerous, we speak of a cancellous bone . On the other hand, if the bone has few cavities, it is classified as compact .
Other types of organs and tissues also have cavities. This is the case with tree trunks or seashells. These cavities may have different functions according to the body in question.

In the construction field , the analysis of the hollowness of the materials is very important to determine their usefulness in each case. It is common for concrete , also known as concrete , to undergo a compaction process to prevent it from having cavities (since they make it more brittle). There are, however, exceptions: concrete that is exposed to very low temperatures has cavities to improve its resistance to eventual freezing.
At a symbolic level, the hole can be a crack or an inconsistency in the thought, speech or action of a person : "The club decided to fire the player after noticing a hole in his commitment to the institution" , "The thesis was not approved since it presented numerous holes in its argument " , " Forgetfulness is a hole that most mortals fall into . "
The coqueras
Coquera is a term closely related to hollowness; in fact, it is a type of small cavity in the mass of a rock, according to the definition of the RAE. In the field of construction, cracks are seen as small holes that appear in reinforced concrete (that is, in artificial stone).
According to certain authors, coqueras can be classified as superficial, medium and important . However, the analysis and assessment of each cavity must be done by qualified personnel, taking into account a series of factors that go beyond the physical appearance of the cracks; For example, it is a fundamental part of the verdict to study the potential collateral damage that they can cause, if they can affect neighboring structures and the speed at which it can worsen.

To understand why chinks are formed, it is necessary to know how concrete is made. It is a heterogeneous material that is achieved by mixing cement, water, gravel and sand. During the formation process, air pockets remain that it is necessary to eliminate, to prevent them from remaining within the mass after application. This process of eliminating air is achieved through the compaction of the concrete, and there are several ways to achieve it successfully:
* using a vibrating needle , also known as a vibrator . It is the most popular resource in construction sites, but it also requires a certain dexterity to be fully effective;
* with a vibrating tray , which is recommended for elements of a moderate thickness, such as slabs and floors. It is worth mentioning that it is easier to use than the vibrating needle, although in certain cases it is advisable to combine both to obtain better results;
* Chopping the dough by hand with the help of a bar . This particular method is the least recommended for treating structural elements.
Crates are a type of cavity that can occur in various dimensions, and this has a direct impact on the risks they carry. It is a directly proportional relationship: the smaller and more superficial, the lower the risks and vice versa. In the most serious cases, it is recommended to carry out work to reinforce the structure, or to tear it down.

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