Reinforced Concrete Protective Layer Block

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Concrete block and reinforced protective layer block, is in the masonry structure and frame structure, under the beam, to expand the confined area, reinforced position, to prevent corrosion of steel exposed and the function.

Is a solution to the often used local pressure. 

Reinforced concrete cover thickness is related to the bearing capacity and durability of the structure, the function such as fire prevention. Has the following role and influence of reinforced concrete guard-layer:

1, maintenance structure durability of concrete protective layer is too thin to penetrate in the wet gas and water, too thick, easy to produce cracks, these could make the steel corrosion and inflation, so that the destruction of a concrete influence use and security of structure.

2, under external force Protection layer for steel bar anchoring force, takes advantage of the anchoring force between concrete and reinforcing steel bar, the two together, jointly participate in the work. Protective layer too thin or missing, reduce its anchorage force which reduces the structure to withstand the axial force and bending moment.

3, from the calculation formula of flexural bearing capacity of normal section

M a l or less FCBX (h0 x / 2) + fy 'AS' (ho - a s') a (sigma pO 'a fpy) a p' (ho - a p '), you can see that when the gluten protective layer through the thick section effectively reduced height h0, will reduce the cross section flexural bearing capacity. Visible protective layer thickness is how important factor affecting bearing capacity of structure.

4, fire protection layer of concrete has a certain thermal insulation effect, can more easily to soften when you encounter fire reinforced protection, if too thin, protective layer thickness under the environment of high temperature easy craze, cause reinforced in overheating and reduce the strength to destroy the whole structure. Hunan hengyang in 2003 a project is due to the high temperature heat from the burning of fire to soften steel lead to collapse and cause heavy casualties accident.

In the quality inspection of the current work, therefore, more attention paid to the protection layer thickness control, new rules to entities in the process of acceptance testing.


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Q:What is the difference between building materials and civil engineering materials?
Building materials can be divided into structural materials, decorative materials and some special materials. Structural materials include wood, bamboo, stone, cement, concrete, metal, brick, ceramic, glass engineering plastics, composite materials, etc .; decorative materials, including a variety of coatings, paint, coating, veneer, colored tiles, with special effects of glass Etc .; special materials that used for waterproof, moisture, corrosion, fire, fire, noise, insulation, insulation, sealing and so on.
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This thing needs to be understood, not known.
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Advanced Mathematics, English, Descriptive Geometry and Engineering Drawing, Theoretical Mechanics, Material Mechanics, Structural Mechanics, Civil Engineering Materials, Engineering Survey, Building Architecture, Construction Equipment, Electrical Engineering, Soil Mechanics and Foundation, Civil Engineering, Concrete Structures Design principle, steel structure design principle, engineering structure earthquake, construction regulations and contract management, construction cost, construction supervision
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Main courses: engineering mechanics, fluid mechanics, rock mechanics, foundation and foundation, engineering geology, engineering hydrology, engineering drawing, computer application, building materials, concrete structure, steel structure, engineering structure, water supply and drainage engineering, construction technology and management
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And other materials, autoclaved aerated concrete block drying shrinkage, moisture expansion. In construction applications, if the drying shrinkage is too large, in the presence of constraints to prevent deformation, the shrinkage of the formation of the stress exceeds the tensile strength or bond strength of the product, products or seams will appear cracks. In order to avoid cracks in the wall, must be in the structure and construction to take certain measures. And strictly control the moisture content of the product when the wall is also extremely important, it is best to control the wall moisture content of 20% or less
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Material to determine the process, according to the material to determine the construction methods, materials on the project cost, perception, quality requirements, engage in earthquake design, fire design, energy saving design and so have a very important impact
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Do not understand the material chemistry, feel civil engineering jobs better wow, everywhere people
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1) brick and concrete structure: brick or load-bearing block masonry load-bearing walls, cast-in-place or prefabricated reinforced concrete floor composition of the building structure. Used to build low-rise or multi-storey residential buildings. (2) frame structure: composed of beams and columns of the main skeleton bearing structure, the floor is generally cast-in-place concrete, wall for the filling wall. Used to build high-rise and high-rise buildings. search for

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