Plastic shrinkage often occurs in the semi fluid or plastic stage of concrete, which is caused by various factors such as settlement motion, capillary tension, early chemical shrinkage, and self shrinkage, resulting in changes in concrete volume.
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Is it true that there will be 7000 concrete companies going bankrupt this year?
In 2025, China’s concrete industry is undergoing an unprecedented “survival test”.
According to industry trends and feedback from multiple markets, nearly 7000 concrete companies will exit the market throughout the year, which is equivalent to about 30% of the total number of registered companies in China by the end of September 2024.
Since 2025, the claim that “7000 concrete companies will go bankrupt this year” has continued to ferment in the industry, causing widespread anxiety among practitioners.
This prediction is not groundless, but stems from the reality of intensive bankruptcies in the industry.
At present, many mixing plants have been shut down and bankrupted in batches, and the price war and funding war among small and medium-sized enterprises have caused a collective break in the funding chain.
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Testing of nominal diameter of steel bars in concrete
The detection of the nominal diameter of steel bars can be carried out by direct method or sampling and weighing method.
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Materials Today | Concrete: From Infrastructure to Structural Energy Storage
As we enter the third decade of the 21st century, the energy landscape is undergoing a profound transformation.
Faced with the imminent energy crisis, renewable energy is increasingly seen as humanity’s “Noah’s Ark”.
And the intermittency of these energy sources has led to a significant amount of energy waste.
For example, in China alone, up to 50 billion kilowatt hours of electricity are cut each year, equivalent to half of the annual power generation of the Three Gorges Dam.
The demand for scalable and reliable energy storage technologies has never been more urgent than now.
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The principle of alkali aggregate reaction in concrete and its impact on durability
Concrete, as one of the most widely used materials in construction engineering, its durability directly determines the service life and safety performance of buildings.
Among the many factors that affect the durability of concrete, Alkali Aggregate Reaction (AAR) is a highly concealed and harmful internal destructive effect, known as the “cancer” of concrete in the industry.
A deep understanding of its reaction principle and its impact on durability is the key to preventing and controlling such diseases.
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Discussion on Thickness Control of Concrete Cover for Tunnel Lining
As a hydraulic construction technician, do you also feel a headache about controlling the concrete protective layer? If the protective layer is left too large, it may cause the concrete to have no reinforcement and be prone to cracks.
If the protective layer is too small, it may cause the steel bars to develop and even expose, seriously affecting the appearance quality of the concrete.
In severe cases, it may even need to be dismantled and rebuilt, resulting in heavy losses.
The author summarizes some control measures for tunnel lining protection layer for your reference.
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[Quick solution to segregation] Upgrading concrete anti segregation agent products, with quick results! Better dissolution and dispersion
SR-3 pre mixed concrete segregation regulator is an upgraded product of pre mixed concrete segregation regulator and concrete anti segregation agent.
Compared with the previous generation product, it has the following characteristics:.
Luda New Materials | A Brief Discussion on Early Damage and Related Prevention Measures of Concrete Structures
Concrete structures often suffer from various diseases in the early stages of use due to factors such as materials, construction, and environment.
If not treated in a timely manner, it will accelerate structural aging and shorten the service life.
The specific manifestations and core features are as follows:.
Technical description of foam concrete raw materials
Foaming agent is the core raw material for the preparation of foam concrete, and its performance directly determines the quantity, structure and final quality of foam concrete.
According to the source of raw materials and preparation process, the commonly used foaming agents for foam concrete can be divided into three categories: rosin gum foam agent, waste animal hair foam agent and other types of foam agent.
There are significant differences in the chemical composition, performance characteristics and application scenarios of various foaming agents.
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Has your concrete quality control been fully implemented? Complete checklist attached
In construction engineering, the quality of pre mixed concrete is directly related to structural safety and engineering durability.
As an engineering manager, have you established a complete quality control system? This article will provide you with a complete checklist for quality control of ready mixed concrete, helping you identify and fill in any gaps.
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