Is concrete beam mold resistant？

Concrete beam molds are widely used in bridges, pavements, etc. Consumers always inevitably have questions: Is concrete beam mold resistant？ Will being in a humid environment such as near water affect the quality of use and life cycle? Will it be affected if it encounters rainy or severe weather? Let’s investigate the above issues together.

Nowadays, many bridges or roads are deployed in coastal and river areas or bridges across rivers and seas. Once reinforced concrete bridges are put into use, they are surrounded by various complex environments. Bridges in these areas must consider the moisture-proof and mildew-proof functions of bridge or road construction.

First, How to Prevent Moisture and Mildew in concrete beam molds

Construction projects will use high-performance concrete. By adding additives that are finer than cement particles, such as microsilica fume, high-quality fly ash, and slag, and using high-efficiency water-reducing agents, the concrete can use a lower water-cement ratio and smaller By reducing water consumption, the overall performance of concrete has been greatly improved. In environments with anti-freeze requirements, air-entraining agents should be added to increase the density, improve the impermeability of the concrete itself, and greatly improve the durability of the concrete.

If you want concrete beams to be effectively mold-proof and moisture-proof, you can also increase the thickness of the concrete protective layer. Because its main function is to protect the steel bars in the beam plates from corrosion. Thickening the concrete protective layer can delay the corrosion of steel bars caused by carbonization, thereby delaying the occurrence time of steel bar corrosion. The minimum thickness of the concrete layer of longitudinally stressed steel bars should be determined according to the environmental category and the strength of the concrete.

Second, seal the steel and concrete surfaces
The sealing process is an effective means to ensure the overall performance of the bridge. After the overall sealing, the structure is in the same electrochemical environment, which avoids the imbalance of the energy state between the repair area and the original area to the greatest extent, and isolates harmful media, thereby protecting Steel bars reduce the speed of modification and improve the durability, mildew and moisture resistance of the structure.

At the same time, regular maintenance and repairs will be carried out on the bridge structure.It is very important to conduct on-site evaluation of the effect of repairs on engineering structures. The Autoclam concrete permeability testing system can be used to test the water and gas permeability of the concrete surface on-site; the Limpet pull-out tester can evaluate the quality of concrete construction on-site and is used for strength testing and interface bonding strength testing of new construction and maintenance projects.

It can be seen from the above three points that the design and response measures for concrete beams to be mildew-proof and moisture-proof are relatively systematic and comprehensive. Even bridges and pavements in coastal areas with water-front and humid climates can also be put into normal use in terms of mildew-proof and moisture-proof.

In fact, the waterproofing and moisture-proofing of bridges is not just about the design and maintenance of concrete beam molds. The overall bridge design must take into account mildew, moisture and rust prevention. How to carry out overall moisture-proof and mildew-proof treatment on bridges?

1. Detailed waterproof design of bridge structure

The bridge deck is designed with a good and smooth drainage system, which can effectively prevent the concrete beams from getting moldy and damp while keeping the bridge structure from or less susceptible to water erosion. The longitudinal and transverse slopes of the bridge deck must meet the design requirements, and the layout of the drainage pipes must be reasonable to ensure smooth drainage on the bridge deck. In addition, the discharge of water between asphalt concrete layers should be considered in the design of the bridge deck pavement and the construction of the drainage pipes.

The design of the waterproof layer should be considered as a whole within the entire bridge. Especially in special parts such as expansion joints, drain pipes, anti-collision walls and edges of separation strips, the continuity of the waterproof layer can be achieved, making the setting of the waterproof layer more reasonable.

2. Reserve cathodic protection measures for important parts

Cathodic protection is a widely used effective measure and is widely used in offshore structures. In bridge design, protection nodes should be reserved in some important parts. Once corrosion is found, the protection system can be quickly activated.

preserved-cathode-protection-measures-for-bridges-huada

3. Apply steel rust inhibitor

Concrete quality is of paramount importance in any case for reinforcement protection. If the quality of concrete materials or construction is poor, or the design is defective, the occurrence and development of the disease will be accelerated. Adding steel bar rust inhibitors on the basis of high-quality concrete is considered to be the simplest, most economical and effective technical measure to protect steel bars for a long time, delay corrosion damage and achieve design life. Adding a steel bar rust inhibitor can play two roles: on the one hand, it delays the time when the steel bars start to rust; on the other hand, it slows down the development of steel bar corrosion.

It is very important to choose a professional construction production supplier. Huada has been deeply involved in the field of concrete beam formwork for nearly 20 years. Its rich design and production experience can bring you more professional services, and its diversified customized products provide you with diverse and most suitable solutions.
In addition, Huada not only provides all types of concrete precast beam mould, but also is an integrated production supplier of manufacturing, transportation, erecting and lifting, customized beam launcher, Straddle Carrier, rubber tyred gantry crane, container straddle carrier,portal craneand other complete series of products to provide you with complete supporting supply services.

Recommended products you may be interested in:（Click to read more）

precast-concrete-segment-mould-from-huada