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Cement: Expired (more than 3 months) or clumped cement cannot be used.
When purchasing cement, one should request a cement certificate from the seller.
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precast-tech
precast technology developments
In depth interpretation of the increase in concrete tax rate
This tax reform is not simply a 10% increase in costs.
General taxable items may actually experience a decrease in tax burden due to an increase in input deductions, while simple taxable items are the true cost pressure zone.
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How can the concrete and cement products industries “weave a web” and dance together as the “Six Networks” project with a total of over 7
Recently, “Six Networks” has become a high-frequency buzzword in the economic field that continues to gain popularity.
At the beginning of the 15th Five Year Plan period, the Politburo meeting of the Communist Party of China Central Committee clearly proposed to strengthen the planning and construction of water networks, new power grids, computing power grids, new generation communication networks, urban underground pipelines, logistics networks, and promote the commencement of major engineering projects with mature conditions.
This adjustment marks the comprehensive opening of a new round of systematic and networked new infrastructure in China.
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Experience exchange on synchronous lining concrete construction of TBM section in a certain tunnel
TBM excavation is a commonly used construction technique for water conservancy tunnels.
The excavation and lining processes are closely connected, and the working space is limited.
The efficiency, quality, and safety control requirements for synchronous lining construction are extremely high.
Synchronous lining can achieve parallel operation of tunnel excavation and concrete lining, effectively compressing the total construction period and improving construction continuity.
This article combines engineering practice to summarize the construction process, process points, quality control, and on-site management experience of synchronous lining concrete in TBM sections.
It also outlines the construction difficulties and countermeasures, which can provide reference and guidance for similar TBM synchronous lining projects in water conservancy tunnels.
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Analysis of the method for determining the optimal dosage of concrete water reducing agent
Among concrete admixtures, water reducing agents are an important type.
Water reducing agents have been widely used in concrete preparation, and the dosage has always been a difficult point in the use of water reducing agents.
This article combines the factors that affect the performance of water reducers and the mechanism of action of water reducers to study the determination method of the optimal dosage of concrete water reducers, in order to achieve the maximum performance of water reducers.
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What are the common locations of concrete seepage
The common water seepage areas in concrete structures mainly include roofs, exterior walls, basements, construction joints, deformation joints, post pouring strips, bolt holes through walls, and the surrounding areas of door and window openings.
These areas are prone to becoming water seepage breakthrough points due to their structural characteristics or complex construction processes.
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The relationship between cement quality and concrete
Concrete is the most commonly used construction material in current construction projects.
Reasonable concrete construction can ensure the functionality and safety of buildings, reduce the probability of safety and quality hazards.
Therefore, appropriate construction measures should be taken based on the actual situation to reduce the impact of external factors on construction and ensure that the performance of concrete meets the requirements.
In actual concrete production, the quality requirements of cement are very important.
Therefore, based on this, a simple study of concrete production is conducted, followed by an analysis of the corresponding cement quality requirements in concrete production, with the aim of ensuring the quality of concrete and ensuring that it meets actual needs.
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【 Builder’s sharing 】 Common quality problem of aluminum formwork construction concrete: surface bubble holes! How to control?
This article “The Past and Present of Bubble Holes on the Surface of Aluminum Formwork Concrete” is written by Hunan Sixth Construction Third Branch Company to address the common problem of surface bubble holes in aluminum formwork construction concrete.
Based on engineering examples and relevant information, it is worth referring to and learning from.
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Research on Error Source Identification and Control Strategy of Rebound Method in Concrete Structure Strength Testing
Based on practical work and theoretical research, this article intends to systematically sort out and identify various sources of errors in rebound testing at multiple levels, and explore an effective method from the aspects of technical management, job specifications, and data processing, laying a solid theoretical and technical support for further improving the accuracy and reliability of rebound testing.
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The good adaptability of concrete admixtures
Concrete admixtures are the “technical soul” of modern concrete, and their adaptability to cementitious materials, aggregates, and mixing water not only determines the construction performance of concrete, but also directly affects its strength and durability.
On the front line of production and construction, through intuitive observation and comprehensive judgment of hand feel, various phenomena are interrelated and mutually confirmed, accurately identifying the good adaptability of additives.
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