Construction Precast Development
Precast News From China
After demoulding, the surface of the concrete is covered with large and small air holes, resembling the appearance of insect infestation.
Although it generally does not affect structural safety, both the client and the supervisor will require rectification, which is time-consuming and labor-intensive.
Below are the reasons for the formation of pores, prevention and control measures, and post repair plans.
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In recent years, the scale of basic construction in China has been continuously expanding, the construction speed has been rapidly increasing, and the amount of concrete used has been increasing.
While high-rise buildings are erected one after another, some problems have arisen due to uneven development, differences in concepts, outdated standards, and unclear responsibilities, even causing engineering quality accidents.
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The contractor shall operate and carry out civilized construction in accordance with the approved construction measures plan.
At the same time, strengthen quality and technical management, record, collect and organize data during the operation process, and regularly report to the supervisor.
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Due to the additional protective effect of the plaster layer on ordinary concrete structural components, even if the steel reinforcement protective layer does not meet the requirements, the risk of steel reinforcement corrosion will not significantly increase under general environmental conditions; Even if the steel bars are corroded, maintenance is relatively easy.
Without a plaster layer on the surface of plain concrete, the risk of steel corrosion will significantly increase when the thickness of the protective layer is insufficient; Once the steel bars corrode, repairing them is also quite difficult.
It is difficult to ensure that the appearance indicators such as surface color, texture, and flatness are consistent with the original surface during subsequent maintenance, which is a major challenge in the repair of plain concrete structural components.
In the past 20 years, many plain concrete structures have been constructed across the country, and their unique architectural shapes and natural decorative effects have added luster to urban landscapes.
But many of the surfaces of plain concrete structures have suffered durability damage and are facing the challenge of repair and treatment.
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After the completion of concrete pouring, when various participating units have doubts about the quality of the concrete, or before the completion of the project sampling inspection, it is necessary to conduct physical testing of various indicators of the concrete to verify whether it meets the requirements of various design indicators.
The specific number of tests will be determined based on the testing purpose and the actual situation of the project.
The main quality inspection index for concrete entities is compressive strength, and two commonly used methods are core drilling method and rebound method.
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In traditional concrete construction, formwork engineering accounts for one-third to half of the total cost and construction period.
3D printed concrete (3DPC) technology is expected to completely break free from template constraints and achieve free-form, low material consumption construction.
However, topology optimization (TO) – a recognized material efficiency “miracle” – often generates structures that are too complex and seriously disconnected from the strict process limitations of 3DPC, such as fixed extrusion width, continuous path, and minimum turning radius.
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The 2026 Concrete Enjoyment Future Annual Conference and the 7th Commercial Concrete Outstanding Entrepreneurs Forum are scheduled to be held in Xiong’an New Area from August 16th to 18th.
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As the core building material, the quality of concrete directly affects the safety and durability of buildings.
Compressive strength, as a key indicator for measuring the performance of concrete, has always been a focus of attention for all parties involved in engineering.
However, in practical engineering, issues related to the compressive strength of concrete are not uncommon, and there have even been many “false and erroneous cases”.
These seemingly concrete quality issues often overlook the truth behind them.
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Article 2: These regulations provide corresponding technical provisions for the raw materials, production processes, quality control, and inspection of ready mixed concrete.
Strict implementation should be carried out during the production and inspection process.
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Macro synthetic fiber-reinforced concrete can partially or completely replace steel bars, reduce construction costs, and improve durability.
However, its synergistic performance with longitudinal bars, especially its structural response under long-term loads, still needs systematic experimental verification.
Existing research focuses more on short-term performance and lacks experimental data on creep, shrinkage, and long-term evolution of cracks.
This study aims to fill this gap and provide a basis for related engineering designs.
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