Construction Precast Development
Precast News From China
Many friends know that the final acceptance of concrete depends on its 28 day strength, but what really affects the pace of on-site construction is actually the 7-day strength.
Today, let’s talk about: What does seven day intensity mean? What factors affect it? How can we improve?.
Hydraulic concrete is a special type of concrete used in water environments, which is used to construct hydraulic structures that can frequently or periodically withstand the erosion, penetration, and other effects of fresh water, seawater, etc.
This type of concrete generally has a large volume and is commonly used for water, underwater, or water level changes.
Due to the harsh natural conditions, special requirements and regulations should be followed in the design and construction of concrete.
Attention should be paid to the selection of raw materials and the design of mix proportions, so that the hydration heat of concrete is low, the shrinkage is small, and the impact resistance and durability are good.
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During construction, it was found that sometimes the following situations occurred: the slump of the concrete discharged from the machine met the requirements, but within less than 20 minutes, the concrete no longer had fluidity.
Upon verification, it was found that no parameter changes had occurred, resulting in the scrapping of the concrete in this vehicle or several consecutive vehicles.
This not only increases the loss of construction raw materials, but also leads to an increase in construction costs and poses significant potential risks to project quality.
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This article introduces the scheme for concrete strength acceptance in the “Code for Acceptance of Construction Quality of Concrete Structures” GB 50204-2015 (hereinafter referred to as the “Code”), including the inspection and evaluation of concrete strength for inspection batches, as well as the inspection of concrete strength for structural entities.
Overall, the regulations in the “Code” for concrete strength acceptance are clearer and more reasonable than the 2002 version.
The rebound core method proposed for testing the strength of structural concrete entities is not only simple, but also can more scientifically and objectively test the strength of structural concrete.
It is of great significance for promoting the improvement of the construction quality of concrete structures in China and improving the concrete strength acceptance method.
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2025 is a crucial year for the conclusion of the 14th Five Year Plan and the planning and layout of the 15th Five Year Plan.
China’s urban development has comprehensively entered a new stage centered on improving the quality and efficiency of existing resources.
The Central Urban Work Conference held in July 2025 established the overall goal of building an innovative, livable, beautiful, resilient, civilized, and intelligent modern people’s city, and made “focusing on building safe and reliable resilient cities” and “promoting convenient and efficient smart cities” the core tasks, providing fundamental guidance for urban construction in the new era.
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Early freezing of cast-in-place concrete has significant adverse effects on concrete strength, steel bond strength, impermeability, and frost resistance.
Therefore, for cast-in-place concrete constructed in low-temperature environments, it is important to take measures to ensure the quality of concrete engineering by identifying and treating it according to changes in climate and temperature at all times, including anti freezing and post freezing measures.
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Imagine you are a top chef (concrete producer) and you are going to make a perfect stew of meat (concrete).
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[Example of problem] In late January, the project supervision agency inspected a concrete structure project in Huairou District, Beijing.
At 9:30 am, it was found that the top concrete poured around 5 am only covered with plastic film, and the surface of the concrete had been frozen!.
In urban infrastructure construction, an efficient drainage system is the key to dealing with waterlogging during the rainy season and ensuring a clean environment.
Yatai Building Materials, with the core concept of “Thai Chain Intelligent Manufacturing”, has launched precast concrete drainage ditches to provide durable and convenient drainage solutions for urban, road and bridge, garden and other scenes.
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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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