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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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Article 8.
1.
4 of the “Code for Construction of Concrete Structures” (GB 50666-2011) states that adding water during transportation, conveying, and pouring of concrete can seriously affect its quality.
This article attempts to analyze the issues of water addition and control during the concrete pouring process, and discuss and learn from peers and experts.
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Ruida Heng Research Institute focuses on industry research reports in the engineering field, as well as research and interpretation of real-time industry trends and national industrial policies, providing professional third-party perspectives and accurate market analysis for engineering industry clients.
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(1) When the pile leaves the factory, the manufacturer should provide a product quality certificate, and its specifications, batch number, and production date should comply with the corresponding acceptance batch number content.
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