Construction Precast Development
Precast News From China
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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:.
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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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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Chemical grouting for leak sealing is generally used for areas with severe water leakage.
The cracks in these areas are usually continuous and difficult to seal.
Therefore, chemical grouting is required for leak sealing.
When sealing, the location of the leaking cracks should be determined, and the treatment methods should be studied before determining the leak sealing plan.
The treatment methods for this type of crack leakage are as follows:.
In the pursuit of high-strength and long-life concrete, scientists have found that cement alone is not enough.
So, fly ash and mineral powder, two types of “industrial waste”, transformed into “concrete reinforcement agents”.
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Contact information: North Building, China Academy of Building Materials Science, No.
1 Guanzhuang Dongli Jia, Chaoyang District, Beijing.
Abstract: Based on the finite difference method, the temperature field of large volume concrete in a raft foundation project of a nuclear power plant was calculated; And based on this, crack resistance calculation was carried out for the large volume concrete of this project through temperature stress calculation; Finally, preliminary discussions were conducted on temperature control measures for large volume concrete in conjunction with this project.
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(2) A certain project used shaft kiln cement from a certain cement plant and high-efficiency composite water reducer from a certain admixture plant, which initially had good effects.
Later, a batch of concrete mixed with the same admixture experienced rapid setting, resulting in a loose concrete structure.
Finally, all 800m3 of concrete that had already been poured had to be smashed off.
Upon investigation, it was found that the cement passed the cement standard inspection and the water reducing agent also passed the inspection.
However, the concrete produced by combining the two had serious quality issues.
In order to investigate the cause, researchers conducted experiments using the cement and water reducing agent involved in the accident, and found that there was indeed a rapid setting phenomenon.
However, by adding 0.
5% to 1.
0% (dihydrate gypsum) to the cement, concrete with good workability and strength was obtained.
This proves that the cement is incompatible with the water reducing agent due to insufficient gypsum content (but meets the cement standard performance).
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As the core material of modern construction engineering, the quality of concrete directly affects the safety and durability of the engineering structure.
With the continuous development of the construction industry, concrete quality control is facing new challenges and opportunities.
This article combines the latest industry data in 2025 with regulatory practices in various regions to analyze the current problems in concrete quality control and propose systematic solutions.
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When racking one’s brain but still unable to establish more independent equations, can one change their mindset and adopt a step-by-step approach to solve or improve by reducing the number of unknowns? Based on our over ten years of usage experience, it is completely feasible.
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