Precast News From China
As the main support of the upper structure, the concrete construction quality of the bridge pier body may directly determine the overall safety and durability of the bridge.
This construction is aimed at the main pier body of a highway super large bridge, using C50 high-performance concrete with a designed pier height of 38 meters and a solid rectangular cross-section.
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There are errors in some clauses of the national standard GB/T 50082-2024 “Test Methods for Long term Performance and Durability of Concrete”.
After verification and confirmation by the chief editor, the relevant content has been modified.
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Whether the strength of concrete occurs and develops regularly, whether surface defects of concrete can be controlled, and whether the durability of concrete can meet the service life are closely related to the construction technology, construction details, and curing of concrete on the construction site.
This article briefly discusses the impact and harm of non-standard construction on concrete quality at the construction site.
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Laws and regulations issued by the state and relevant departments, current design, construction specifications, quality acceptance standards, and other relevant documents and technical standards and requirements stipulated in the bidding documents issued by the State Railway Administration, China Railway Group Co.
, Ltd.
, and Sichuan Provincial People’s Government.
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It is only for your reference in concrete mix proportion design, and the software author is not responsible for any consequences caused by this software.
Please remember! Please use with caution!.
Example 1: A certain project involves the construction of an existing building starting from the 8th floor.
The engineering part is a shear wall made of C40 concrete.
After demoulding, vertical cracks were found on the wall surface, which were very regular.
There were vertical cracks every 1.
5m to 1.
8m, with sharp ends and a wide middle.
The widest part was about 0.
2mm to 0.
3mm.
Some cracks are through cracks.
The concrete strength can reach around C45.
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When the New Year’s bell rings, we bid farewell to the past and welcome the hopeful year of 2026.
This is a brand new starting point and also the beginning of a new journey.
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The rebound method is the most commonly used and convenient non-destructive method for on-site testing of concrete compressive strength.
However, different personnel often have differences in the testing results of the same component, which is often not a problem with the instrument, but rather due to differences in understanding and operational details of the “Technical Specification for Testing Concrete Compressive Strength by Rebound Method” (JGJ/T 23-2011).
The key to mastering the essence of this regulation lies in understanding “why” rather than just “what to do”.
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The concrete gradually sets and hardens after pouring, mainly relying on the hydration of cement, which must be carried out under suitable temperature and humidity conditions.
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The ‘winter period’ in concrete winter construction is a technical concept of engineering construction, different from the ‘winter’ in daily life.
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