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precast-tech
precast technology developments
Quick report: Production and economic indicators of concrete and cement products industry from January to April 2026
According to data analysis from the National Bureau of Statistics, from January to April 2026, the cumulative production of key products in the concrete and cement products industry will experience a comprehensive decline.
Among them, the cumulative production decline of cement drainage pipes and cement pressure pipes has narrowed compared to January to March, while the cumulative decline of commercial concrete, concrete poles, and precast concrete piles has further expanded compared to January to March.
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How many days does concrete have severe delayed setting and become weak without strength? Root cause+emergency measures
Excessive use of polycarboxylate and sodium gluconate as retarding components and water reducing agents can inhibit cement hydration, resulting in a mild delay of 2-5 days and long-term non hardening paste like appearance.
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13CJ39 concrete sealed cured floor
This atlas is applicable to the design and construction of concrete floors in industrial and public buildings with requirements for wear resistance, dust prevention, and corrosion prevention.
It can also be used for the renovation of old concrete floors and the sealing and curing treatment and decoration of outdoor concrete floors.
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How long can GFRP reinforcement in concrete withstand high temperatures? This study provides the answer
The concrete protective layer can significantly delay the tensile performance degradation of GFRP reinforcement at high temperatures, but it will lose its protective effect above 400 ℃; This article proposes a residual strength prediction model based on heat absorption parameters, providing a theoretical basis for the fire protection design of GFRP reinforced concrete structures.
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The Influence and Research Progress of SAP on the Performance of High Performance Concrete
High performance concrete is widely used in key infrastructure projects due to its advantages such as low water cement ratio, high strength, and high density.
However, low water cement ratio systems are prone to significant self drying effects during the hydration process, leading to self shrinkage and early microcracks, reducing structural durability and limiting their engineering applications.
Super absorbent resin (SAP) is a three-dimensional network cross-linked polymer additive with strong water absorption, retention, and slow-release capabilities.
It can form a “micro reservoir” inside concrete and continuously replenish water and inhibit shrinkage through internal curing.
It is a new functional material that improves the crack resistance and durability of high-performance concrete.
This article summarizes the material properties, modification mechanism, impact on concrete performance, and future research directions of SAP based on domestic and foreign research results.
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The application of finely ground stone powder in the actual production of concrete!
The second phase of the National Commercial Concrete Enterprise Sales Special Practical Skills Training Course for June is currently recruiting students .
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Trial molds have standardized requirements, and there are also operational requirements for the formation of test blocks. Concrete standard
The laboratory is not only the main department for controlling the quality of concrete, but also the core of technological development and development.
At the same time, it is also the window for the external image of the enterprise and the top priority for concrete enterprises.
Therefore, high-quality inspection tools can enable experimenters to obtain real data, have a clear understanding, save energy and reduce consumption for enterprises, and safeguard quality.
The standard test block obtained through standard trial molding is the only prerequisite for obtaining real and standard data.
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Excessive concrete loss, adjusting with water reducing agent, case analysis
A certain project said, “The slump of freshly mixed concrete was lost in 10 minutes, causing dozens of cubic meters of concrete to be unable to be constructed.
Your admixture manufacturer should come and adjust it quickly, and you will be responsible for the economic losses caused!” After the accident, we immediately set off and arrived at the site to replace the raw materials of the concrete one by one using the elimination method, observe the working performance of the concrete, and ultimately lock the cause on the washed sand.
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What is Green Building Material Certification? Understand the article on concrete enterprises
If you also have these questions, this article will explain them to you in the simplest words.
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