It doesn’t start with ‘what is shrinkage’, but rather with the analysis that cracks during a hydration heat stage are never round.
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The trial calculation method for concrete mix design, explain it clearly in one go!
When racking one’s brain but still unable to establish more independent equations, can one change their mindset and adopt a step-by-step approach to solve or improve by reducing the number of unknowns? Based on our over ten years of usage experience, it is completely feasible.
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Discussion on Antifreeze Concrete and Antifreeze Concrete
In the construction industry, some construction workers often refer to winter construction concrete and concrete with frost resistance requirements in structural design as “frost resistant concrete”.
The author believes that the concrete used in winter construction mainly adopts technical measures to prevent frost heave damage before reaching the critical strength after pouring, which meets the technical requirements and should be called antifreeze concrete.
The structural design has requirements for frost resistance grade, and only concrete with long-term resistance to freeze-thaw cycles should be called frost resistant concrete.
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The appearance of the T-beam is not attractive, is it really due to inadequate concrete vibration?
In bridge construction, T-beams are key load-bearing components.
Once the appearance of the concrete is problematic, it is not only unsightly, but may also pose structural hazards.
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It’s getting cold, a winter construction reminder for the workers of the concrete construction unit
In the spirit of being responsible for engineering quality, our company has put forward higher requirements for concrete production in this stage and developed a comprehensive winter construction technology plan: during the winter concrete construction process, our company uses antifreeze and water reducing agents, reduces water cement ratio and other methods to prepare concrete, and increases efforts in raw materials, production process, quality control and other processes to ensure that the quality risks of concrete production, transportation, pouring and other links are minimized.
While our company takes technical measures for winter construction of concrete, the pouring, curing, and maintenance of concrete will also have a direct impact on the quality of concrete structures.
In order to prevent quality accidents to the greatest extent possible, the relevant matters are introduced below in order to achieve good results and help you create excellent projects.
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How critical is the 7-day strength of concrete?
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?.
Study on the influence of polycarboxylate superplasticizer compounding process on the workability of hydraulic concrete in underpass channel
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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Detection of residual flocculants in washed fine aggregates and exploration of their impact on concrete
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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How to scientifically verify the strength of concrete?
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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