Construction Precast Development
Precast News From China
precast technology developments
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Phenomenon: Cracks that settle due to bleeding or shrinkage of concrete within 1-3 hours after pouring.
The settlement crack cracks along the direction of the main reinforcement on the surface of the beam and slab, and the crack extends as deep as the surface of the reinforcement.
Plastic shrinkage cracks produce irregular diagonal cracks above the steel bars.
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In the field of engineering construction, concrete is the main load-bearing material, and its strength grade is directly related to structural safety and service life.
According to the “Code for Design of Concrete Structures” (GB/T50010-2010), different engineering parts have strict requirements for concrete strength.
For ordinary homebuyers, when they discover quality problems such as cracks and component deformation in their houses, they can learn about the strength of the concrete through the following methods.
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The climate characteristics of autumn are distinct, with large temperature differences between day and night, frequent fluctuations in air humidity (some areas are rainy in the early stage and dry in the later stage), and gradually decreasing temperatures.
These factors will have a significant impact on the mixing, transportation, pouring, and curing of concrete, which can easily cause problems such as cracks, slow strength growth, and decreased structural durability.
Therefore, in autumn concrete construction, it is necessary to focus on the four core points of “temperature control, moisture retention, crack prevention, and strength promotion”, and pay special attention to the following precautions:.
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Are newly hired construction workers and document clerks confused about concrete test blocks? This article uses the most straightforward language to quickly grasp the core purpose, basic process, and key quantities of concrete sampling, allowing you to quickly get rid of the label of “novice”.
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In today’s rapidly developing urbanization, skyscrapers are rising from the ground, cross sea bridges are winding and magnificent, and highways are crisscrossing.
We are amazed by the grandeur of these magnificent projects, but rarely pay attention to their most fundamental component – concrete.
It may seem plain and unadorned, but in reality, it hides the universe.
Modern concrete is no longer simply a mixture of cement, sand, and stone.
Every leap in its performance is inseparable from the empowerment of a key material: concrete admixtures.
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It is crucial to develop specialized mix proportion adjustment plans and production precautions for concrete construction in autumn and winter, especially under low temperature, strong wind, and dry conditions.
This can effectively prevent a series of problems such as concrete freezing damage, slow strength growth, cracking, etc.
, ensuring the quality and progress of the project.
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The annual investment plan of 406.
9 billion yuan in Xinjiang is bringing unprecedented opportunities and changes to the fields of concrete and engineering machinery.
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Concrete 3D printing technology is receiving widespread attention worldwide due to its advantages of design freedom, no need for templates, and high construction efficiency.
However, the enormous potential of this technology – to easily construct complex shaped buildings – has encountered bottlenecks in practical applications.
Most of the current technologies for 3D printing architecture can only print vertically, and when encountering complex tilted or curved structures, it is easy to “overturn” – deform or even collapse.
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The bridge is a 72m through type steel-concrete arch bridge, with a total length of 94m and a deck width of 28-30m.
The lower structure of the bridge adopts drilled pile foundation and gravity bridge abutment; The upper structure is composed of steel box girder structure and arch ribs.
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