Construction Precast Development
Precast News From China
conpd0523 
The original design requirement was to use mud wall protection to form holes, but due to site conditions, it was changed to a full steel casing for further drilling.
The designed pile diameter is 600mm and the steel casing diameter is 800mm.
When settling, is the concrete quantity calculated based on the designed pile diameter or the steel casing diameter?.
The adjustment of post bleeding (delayed bleeding) in concrete requires comprehensive consideration from multiple aspects such as raw materials, mix proportions, and construction processes.
The following are some common adjustment methods:.
SR-3 pre mixed concrete segregation regulator is an upgraded product of pre mixed concrete segregation regulator and concrete anti segregation agent.
Compared with the previous generation product, it has the following characteristics:.
This report focuses on the engineering application requirements of C30 high-performance concrete, with the core innovation goal of “low-carbon environmental protection, high strength durability, excellent workability, and controllable cost”.
Combining the characteristics of mainstream raw materials and cutting-edge concrete technology, the mix proportion optimization design is completed.
The design strictly follows standards such as the “Design Specification for Ordinary Concrete Mix Proportion” (JGJ55-2011) and the “Technical Specification for Application of High Performance Concrete” (CECS 207-2006).
Through the collaborative optimization of multi-component materials, efficient utilization of admixtures, and admixture compounding technology, the synergistic improvement of concrete performance, environmental benefits, and economic benefits is achieved.
This mix proportion is suitable for ordinary building structures, large volume concrete projects, and civil and industrial buildings with high durability requirements, providing technical support for the application of concrete in related projects.
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Project overview: The total length of the project route is 2.
516km, which is constructed according to the standard of two-way four lane municipal first-class highway.
72% of the subgrade along the route is in Class IV self weight collapsible loess stratum, with a collapsibility coefficient of 0.
025~0.
057, a thickness of 5~14m, and a weak foundation bearing capacity (90~120kPa).
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A new type of concrete sales model has emerged in regions such as Anhui and Xi’an.
Previously, it involved directly acquiring mixing plants, often costing tens of millions or even hundreds of millions.
Such a large investment is undoubtedly a suicidal act in the current industry situation.
Therefore, the following new type of concrete sales method has emerged.
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The method involves excavating with an excavator and leveling with manual assistance.
When digging road trenches, temporary drainage facilities must be taken to prevent water accumulation in the trenches and softening of the roadbed.
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In concrete construction, material differences, environmental fluctuations, and insufficient material adaptation can easily lead to rapid slump loss, poor aggregate gradation, high powder content (MB value) of machine-made sand, and incompatibility between polycarboxylate admixtures and cementitious materials, which directly affect the performance of concrete and lay quality hazards.
This article briefly explains the diseases, causes, and practical treatment methods of each problem, providing accurate guidance for on-site construction.
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By using advanced equipment and processes to control various indicators of machine-made sand within a good range, the quality of machine-made sand can be further improved.
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