Construction Precast Development
Precast News From China
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The flower hammer chiseling tool consists of a high-strength alloy hammer head and an electric impact device (such as an electric hammer or pickaxe).
It forms a uniform “lychee surface” texture on the concrete surface through high-frequency impact, breaking the smooth surface structure and achieving a chiseling effect with a depth of about 1-5 millimeters.
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In the 2026 “Friends of Time” New Year’s Eve speech, Luo Zhenyu quoted the viewpoint of AI expert Dai Qing: the concrete industry is essentially a “fresh food industry”.
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Shimizu Construction Co.
, Ltd.
, a Japanese construction engineering and design company founded in 1804, has developed a spray type 3D concrete printing system specifically designed for the construction of large-sized curved reinforced components.
This system integrates a nine degree of freedom gantry robot and a material spraying simulation system, which can pre verify the forming characteristics of sprayed materials.
This technical solution can achieve high-precision automated production of reinforced structural components and large components with complex geometric shapes, which is difficult to achieve with traditional material extrusion 3D printing technology.
The material injection simulation system carried by the system is jointly developed by Shimizu Construction and the Computational Engineering and Robotics Laboratory (CERLAB) led by Professor Kenji Shimada from the Department of Mechanical Engineering at Carnegie Mellon University.
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In the current transition of urban construction towards high-altitude and green construction, high-strength concrete (HSC) has become the core material of super high-rise buildings due to its excellent mechanical properties.
However, the resource consumption and carbon emissions problems brought by traditional production modes are becoming increasingly prominent.
How to achieve sustainable development of high-strength concrete through the substitution and performance optimization of recycled materials? The latest research provides an innovative answer that balances performance and environmental protection through the composite application of modified recycled concrete aggregates (MRCA) and metakaolin (MK), combined with machine learning quantitative analysis.
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The winter temperature in the northwest region of China is relatively low, and winter construction in cold areas can have adverse effects on the various properties of concrete.
Long term exposure to cold environments can increase the porosity and decrease the compactness of concrete, making it loose and brittle, seriously affecting its mechanical and durability properties.
Adding antifreeze can effectively lower the freezing point of liquid phase water in the internal pores of concrete, allowing concrete to undergo hydration reactions well under low temperature conditions, thereby significantly improving the frost resistance of concrete.
Therefore, researching high-performance antifreeze agents to improve the mechanical and durability properties of concrete in cold regions is of great practical significance.
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The residual amount of the original coarse ash sieve is relatively large, containing a lot of impurities and a large loss on ignition, so the actual effect cannot be well reflected.
In view of this, the concrete made from it does not have ideal fluidity, and its water retention and cohesion do not meet the requirements, which will have a great impact on the quality of fresh concrete; Due to excessive water demand, the actual water consumption per unit volume of concrete may exceed the expected water consumption, resulting in an increase in water cement ratio, a decrease in compressive strength grade, and a serious weakening of the durability of hardened concrete.
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Concrete strength is the core safety indicator of building structures, and the precision of testing is of great significance for controlling engineering quality.
Rebound testing technology is easy to operate and non-destructive.
It is widely used in building engineering principles, mechanisms, practical operations, adaptation of different components, and error control.
Each link affects the reliability of testing results.
Exploring technical details, optimizing application strategies, analyzing and controlling errors can provide technical support for quality assessment of construction projects, and connect key theoretical and practical aspects.
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At present, in the construction process of major construction projects in China, there are different factors that affect the production of concrete test blocks.
The key issues include the size and external shape of the test blocks not meeting the requirements, excessive use of waste engine oil in the isolation agent, and excess concrete materials, which need to be highly valued by relevant work units.
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