Precast News From China
Before pouring the concrete of the component, the prestressed steel bars are first tensioned and anchored on the pedestal, and then the concrete is poured.
After the concrete reaches the specified strength value, the anchorage is released, the steel bars are relaxed, and the prestressing is applied to the concrete, which is called pre tensioning prestressing.
The pre tensioning method has a simple production process, few steps, high efficiency, and easy quality assurance.
.
Concrete is the most widely used structural material in the construction industry, and its quality directly affects the safety and durability of buildings.
Concrete testing, as a crucial step in ensuring its performance meets design requirements, has become an indispensable part of engineering construction.
.
The Code for Acceptance of Construction Quality of Concrete Structures GB 50204-2015 is a mandatory national standard for the construction quality of concrete structures in China’s construction engineering field.
It came into effect on September 1, 2015 and replaced the original standard GB 50204-2002 (2011 edition).
This specification specifies the construction quality acceptance requirements for concrete structure engineering from raw materials to finished products, ensuring that the structural safety, durability, and functional use of the project meet the design requirements.
.
The strength of concrete has a significant impact on the overall service and use in the future.
High strength results in longer service life and correspondingly higher wear and compression resistance; If the strength is too weak, it can easily lead to a series of disadvantages such as sanding, graying, cracking, poor wear resistance, and poor impermeability, requiring significant costs for repair or refurbishment.
.
Admixtures have become an indispensable component of concrete and are widely used in concrete production.
However, in production practice, engineering quality accidents often occur due to improper selection and use of admixtures.
The negative effects that commonly used additives may have on the performance of concrete mainly include the following aspects:.
In the construction industry, some construction workers often refer to winter construction concrete and concrete with frost resistance requirements in structural design as “frost resistant concrete”.
.
According to the Implementation Rules for Green Building Material Product Certification and the characteristics of concrete products (including pre mixed concrete, special concrete such as permeable concrete, high-performance concrete, etc.
), enterprises applying for concrete green building material certification need to prepare the following documents according to the following list to ensure the efficient progress of the certification process:.
1.
Localized lack of slurry and roughness on the surface, or numerous small pits, resulting in poor visual quality.
As an important structural form of high-grade highways and urban roads, the design quality of cement concrete pavement directly affects the performance, durability, and driving safety of the pavement.
According to current regulatory requirements, the design of cement concrete pavement is a systematic project that requires comprehensive consideration of various aspects such as surface layer type selection, structural layer combination, joint construction, reinforcement measures, and drainage schemes.
.
Are friends who work on high demand concrete projects often troubled by these problems: after demoulding, the surface of the concrete is pitted, the edges and corners are damaged, and the mirror effect cannot be achieved; Release agent contaminates steel formwork, affecting structural safety; RC1301 concrete demoulding agent can accurately solve the problems of failure when washed away by rain and water, and always causing problems in outdoor construction.
It is a water-based formula designed specifically for “concrete demolding with high surface requirements”, especially suitable for customers who pursue surface texture and structural safety.
From core requirements to construction adaptation, it is reassuring.
.