{"id":974,"date":"2017-05-31T09:11:35","date_gmt":"2017-05-31T12:11:35","guid":{"rendered":"https:\/\/www.grupoacocearense.com.br\/?p=974"},"modified":"2025-05-07T09:12:00","modified_gmt":"2025-05-07T12:12:00","slug":"aco-em-concreto-protendido-conheca-as-aplicacoes-e-vantagens","status":"publish","type":"post","link":"https:\/\/www.grupoacocearense.com.br\/en\/aco-em-concreto-protendido-conheca-as-aplicacoes-e-vantagens\/","title":{"rendered":"Steel in prestressed concrete: discover the applications and advantages"},"content":{"rendered":"

Since humans began living in society, engineering has been transforming their daily lives. Over time, techniques have improved, and the size and complexity of structures have increased.<\/p>\n

The Egyptian Pyramids, a hospital, a simple residence, and all other types of constructions utilize technologies developed by civil engineering. To achieve positive results in the consumer market, a business owner must stay abreast of the latest developments in this field.<\/p>\n

THE\u00a0prestressed concrete<\/a>\u00a0It's one of the most modern methodologies and is widely used today. But do you know what it is or how it works?<\/p>\n

Today's post answers these and other questions. Continue reading and learn more about steel in prestressed concrete!<\/p>\n

Understand what prestressed concrete is<\/h2>\n

Concrete is a material that performs very well when subjected to compressive stresses. However, its tensile strength is quite low, reaching 10% of the previous parameter value.<\/p>\n

To solve this problem, the following are used:\u00a0steel bars<\/a>, in order to support such loading. However, in some cases, the stresses exceed the resistance limits of reinforced concrete, and another construction option is necessary.<\/p>\n

Prestressing is a technology that induces, in a structure, a previous state of tension by using active reinforcement with the aim of increasing the resistance of the concrete part.<\/p>\n

Prestressed concrete is divided into three types:<\/p>\n

Prestressing with initial adhesion<\/h3>\n

A situation in which the reinforcement is pre-stretched before the concrete is poured. It is also widely used in the concreting process for prefabricated parts.<\/p>\n

Post-bond prestressing<\/h3>\n

Cases in which the prestressing force is applied after the concrete has cured. At this point, hydraulic jacks are used to subject the active reinforcement to previously calculated stress values.<\/p>\n

Prestressing without adhesion<\/h3>\n

In this case, prestressing is applied to the part after it has cured, without any adhesion between the active reinforcement and the concrete. Thus, the active reinforcement is placed in ducts, consisting of metal and plastic sheaths, and injected with grease to prevent corrosion.<\/p>\n

In short, when it comes to prestressed concrete, a load is applied to the piece, either before or after its production, to combat the demands that are to come on its structure.<\/p>\n

Learn about the history of steel in prestressed concrete<\/h2>\n

In 1824, Portland cement was developed in England, and concrete elements began to appear in our society. As time passed, architectural designs became more ambitious, and reinforced concrete could no longer keep up with their solutions.<\/p>\n

Loads and spans increased, requiring the creation of a new methodology to solve this problem. After several attempts and experiments around the world, in 1928, in France, satisfactory and reliable results were obtained in their work on prestressed concrete.<\/p>\n

In Brazil, in 1948, the Gale\u00e3o Bridge in Rio de Janeiro was the first project to use prestressed concrete. In this case, all materials were imported from abroad, as this methodology was still new in our country.<\/p>\n

Discover the applications of reinforced concrete and prestressed concrete<\/h2>\n

Some professionals confuse the use of these two construction methodologies, so to avoid making the same mistake, see below what their differences are:<\/p>\n

Applications of reinforced concrete<\/h3>\n

Reinforced concrete structures are widely used in our society. Homes, hospitals, schools, and all small and medium-sized structures use this construction method. However, as loads, spans, and structural design increase, it becomes necessary to adopt something more modern and resistant.<\/p>\n

Applications of prestressed concrete<\/h3>\n

As mentioned earlier, prestressed concrete was created to increase the strength of concrete elements in a structure. As a result, architects and engineers can create bolder and more challenging projects. Today, prestressed steel concrete is used to build:<\/p>\n