Construction Precast Development
Precast News From China
precast technology developments
After the hoisting of the steel cage is completed, the conduit or air pump pipe should be installed for secondary hole cleaning, and the hole position, diameter, verticality, depth, sediment thickness, etc.
should be inspected.
After passing the inspection, concrete should be poured immediately.
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When applying pre mixed concrete in engineering, it is troublesome for the supplier to explain or prove that the supplied concrete is qualified when the demand side reports that the compressive strength or non-destructive or semi destructive testing strength of the test specimens formed on site is not qualified.
In fact, this is a problem of “truth” and “falsehood”.
Whether it is truly unqualified or fake unqualified, it is an urgent and thorny issue for suppliers, mainly due to their disadvantaged position.
If it is truly unqualified, it will be verified by authoritative experts and dealt with accordingly; But there are also many reasons why “fake” products are not qualified.
If the handling method is not appropriate, the supplier will suffer unjustly.
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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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The above steps need to be adjusted based on the actual situation of the project and the characteristics of the raw materials.
The final mix proportion needs to be verified through trial mixing and testing to ensure that the concrete performance meets the design and construction requirements.
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The complete solidification time of concrete usually depends on various factors, such as the mix proportion, temperature, humidity, etc.
Generally speaking, concrete will initially harden within 24 hours and reach strong strength after 72 hours, but it usually takes 28 days to fully solidify and reach the design strength.
This is because the hydration reaction of cement requires a certain amount of time to fully proceed, and as time goes on, the strength of concrete will gradually increase.
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On September 24, 2025, the Ministry of Industry and Information Technology and six other departments jointly released the “Work Plan for Stabilizing Growth in the Building Materials Industry”, which sets the industry tone: by 2026, the operating revenue of green building materials will exceed 300 billion yuan.
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According to data analysis from the National Bureau of Statistics, the main economic indicators of the concrete and cement products industry will continue to decline from January to November 2025.
The main business income of the concrete and cement products industry above a certain scale decreased by 14.
3% compared to the same period last year, a decrease of 0.
3 percentage points from January to October; The total profit decreased by 26.
57% compared to the same period last year, a decrease of 0.
34 percentage points from January to October.
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Recently, the data of Chengdu’s ready mixed concrete industry in 2025 reflects the industry difficulties in first tier cities across the country.
There are 147 compliant enterprises in the city (24 state-owned enterprises and 123 private enterprises), with a total output of 41.
22 million cubic meters, a year-on-year decrease of 15%.
The capacity utilization rate is only 24%, and most enterprises are operating at half capacity or even temporarily shut down.
The industry concentration is extremely high, with 8 leading enterprises accounting for 49% of the total output, and small and medium-sized enterprises struggling to survive.
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Concrete mix ratio is almost a core skill that every concrete practitioner must master.
Both enterprise managers and frontline technicians are well aware that the rationality of mix proportions directly affects the quality and construction effectiveness of concrete.
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In bridge construction, bridge piers serve as key load-bearing structures, and their concrete quality directly affects the safety and durability of the bridge.
In the actual construction process, the phenomenon of honeycomb and cracking on the concrete outside the bridge pier occurs from time to time.
These issues not only affect the appearance of the bridge, but may also weaken the load-bearing capacity of the structure and reduce the service life of the bridge.
It is of great practical significance to conduct a thorough analysis of the causes of honeycomb and cracking in the concrete outside the bridge pier, and to take effective remedial measures.
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