WHAT IS A PROTECTIVE CONCRETE LAYER?

1. What is a protective concrete layer?

The protective concrete layer is the concrete layer covered on the outside of the building. To prevent the steel layers in concrete from being exposed to external environmental conditions. Helps protect steel layers from oxidation leading to steel corrosion, seriously affecting the structure of the building.

The thicker the protective layer, the more durable and sturdy it is to protect the structure. On the contrary, if this coating is too thin, it will cause structural corrosion to occur quickly, thereby reducing the quality of the project. And of course, the protective layer thickness must be measured and designed according to clear design standards. The concrete layer cannot be arbitrarily poured without prior calculation.

2. Standards for reinforced concrete layers in Vietnam

Currently, our country has a number of documents regulating standards for reinforced concrete layers. Each document has its own regulations, but they all aim at the standard that the concrete layer must not be smaller than the diameter of the reinforcement. Below are some specific standards and how to choose the thickness of the concrete layer as well as specific data will be stated in part 3.

- Reinforced concrete layer standards according to TCVN 5574:2018 in section 10.3.1.2

If based on the provisions of this Standard, the reinforced concrete layer must meet the following criteria:

• Reinforcing steel and concrete need to work together simultaneously.
• Pay attention to the issue of anchoring reinforcement in concrete as well as the arrangement of joints of reinforcement details.
• Ensuring the integrity of steel reinforcement under the impact of harsh environments.
• The concrete surface must not be cracked or rough.
• Has the ability to withstand heat of the building structure.
• The protective concrete layer is not allowed to be smaller than the diameter of the reinforcement.

- Reinforced concrete layer standards according to TCXDVN 356:2005

Based on this standard, reinforcement will be divided into 3 types:

• Longitudinal steel reinforcement
• Durable reinforcement, structural reinforcement and distributed reinforcement
• According to the large thickness of concrete at the ends of prestressed structures.

- Some other standards

In addition to the above standards, people also rely on a number of reinforced concrete layer standards according to TCVN 9346:2012 in table 1, section 4 and reinforced concrete layer standards according to QCVN 06:2020/BXD, Appendix F.

3. Hướng dẫn chọn độ dày lớp bê tông bảo vệ

To determine the appropriate thickness of the protective concrete layer, you should use calculation methods on the likelihood of appearance and width of concrete cracks when affected by the surrounding environment.

In case you cannot calculate, you can refer to the above standards and make an appropriate choice, detailed as follows:

- Based on TCVN 5574:2018 in section 10.3.1.2

If you choose the thickness of the protective concrete layer for a construction project according to this standard, you need to choose according to the following table:

- Based on TCXDVN 356:2005

For load-bearing longitudinal reinforcement, the thickness of the protective concrete layer must not be less than the following factors:

• Reinforcement diameter
• Cables
• Slabs and walls with thickness: From 100 meters or less: 100mm (15mm), over 100 meters or more: 15mm (20mm).
• Rib beams and beams with height: less than 250mm: 15mm (20mm), greater than or equal to 250mm: 20mm (25mm).
• Column: 20mm (25mm)
• Foundation beam: 30 mm
• Mounting: 30 mm
• The entire block with concrete lining is 35 mm, but without concrete lining it is 70 mm.

Note:

- Values ​​in brackets will be applied to outdoor structures or wet locations.

- For 1-layer structures made from lightweight or hollow concrete from B7.5, the thickness must be greater than 20mm. As for panels without plaster, the requirement must be greater than or equal to 25mm.

- For a single-layer structure made from honeycomb concrete, the thickness must not be less than 25mm.

- For distributed reinforcement, structural reinforcement and tough reinforcement, it is divided into 2 cases:

• When the member section height is less than 250mm, choose a thickness of 10mm (15 mm).
• When the member section height is greater than 250mm, choose a thickness of 15mm (20 mm).

4. Introducing a reputable design & construction consulting service provider

The importance of construction units is undeniable because their reputation will ensure the quality and aesthetics of your project. Today, there are many units providing construction design services to meet the increasing construction demand in our country. Therefore, finding a reputable unit is not easy and requires you to spend time researching. During the selection process, you need to research carefully and ensure that the accompanying unit must have high professional qualifications, many years of experience, have a clearly signed contract, transparent costs,... Nowadays, according to feedback from some customers who have contacted Hung Nghiep Phu shows that there are currently many fraudulent units that are construction design consulting companies to scam people for many different purposes. To help customers save time searching, Công ty TNHH Đầu Tư Xây Dựng Hưng Nghiệp Phú is confident that it will be the best choice for you.

Hung Nghiep Phu Construction Investment Co., Ltd. with the mission of bringing the best solutions and services, together with customers to build a prosperous community, Hung Nghiep Phu is gradually asserting its brand through Sincere cooperation, with a team of leaders with ethical capacity, creativity, dedication to the profession, and strategic vision. Hung Nghiep Phu owns a team of skilled and highly qualified staff who will bring customers the best quality projects. 

Hung Nghiep Phu Construction Investment Company Limited - specializes in constructing civil and industrial projects. We look forward to accompanying customers in construction projects as well as legal procedures such as planning diagrams, applying for construction permits, completing processes, applying for fire prevention and fighting certificates, ... If you have any questions or are in need of designing and perfecting the process, please contact us immediately for a free consultation!

>>> See more:

• Cách chia bậc thang theo phong thủy và hướng dẫn xây dựng bậc cầu thang

• So sánh móng một phương và móng hai phương

• Top những mẫu nhà đẹp nhất hiện nay

• Có nên khởi công xây dựng nhà vào lịch tháng 7 không?

• Có nên xây nhà trọn gói không?

• Tại sao cần có đội ngũ tư vấn thiết kế và thi công xây dựng 

_____________________

CONTACT INFO:

 Facebook:  Công ty TNHH Đầu Tư Xây Dựng Hưng Nghiệp Phú (興業富) 

 Đường dây nóng: 1800.3368 (Miễn phí)

 Trang web:  xaydunghunnghiepphu.com

 Gmail: kinhdoanh01@xaydunghungnghiepphu.com

 Địa chỉ: Số 2034D, tổ 22, KP Phước Thái, P. Thái Hòa, TP. Tân Uyên, Tỉnh Bình Dương

------

Source: Collected Internet