[Abstract] This article analyzes the reasons for disputes between commodity concrete enterprises and construction units, such as volume, strength, cracks, color difference, etc.
, and proposes preventive and control measures.
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Analysis of the Influence of Rock Characteristics in Quarry on Aggregate Quality and Concrete Performance
The artificial sand and gravel processing system has developed rapidly in recent years, with significant advances in sand and gravel processing equipment and technology.
Due to the depletion of natural sand and gravel resources, various regions have increased their efforts to protect the environment.
Artificial sand and gravel have replaced natural sand and gravel, leading to a significant increase in their usage and a trend of gradually replacing natural sand and gravel aggregates.
Through engineering examples, the influence of aggregate characteristics on engineering in artificial sand and gravel systems was analyzed.
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Application of mix design of ultra-fine sand concrete in Libyan engineering
The 5000 housing project in Libya is located in Misrata, Libya, 200km away from the capital city of Tripoli.
Libya is a country that lacks fresh water and has a lot of fine sand.
It is adjacent to the Mediterranean Sea in the north and the vast Sahara Desert in the south, with a subtropical Mediterranean climate.
Climate characteristics: Warm and rainy in winter, hot and dry in summer; The average temperature in January is 12 ℃, and the average temperature in August is 26oC.
In summer, it is often affected by dry and hot winds from the southern Sahara Desert, and the temperature can reach over 50 ℃; The annual average precipitation is 100-600mm, mostly concentrated in winter.
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Precautions for winter construction of permeable concrete
According to the industry standard “Construction Code for Building Engineering” JGJ104-97 in China, the construction process where the daily average outdoor temperature remains below 5 ° C for 5 consecutive days is called winter construction.
When the project enters the winter construction stage, corresponding winter construction measures should be taken for concrete pavement engineering.
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Study on the influence of curing temperature on the strength development of concrete specimens
Concrete, as the core material of construction engineering, has a direct impact on structural safety and durability in terms of its strength.
The maintenance temperature becomes a key factor in regulating the strength development by affecting the cement hydration process.
In practical engineering, unexpected fluctuations in concrete strength often occur at different environmental temperatures, leading to potential quality hazards in the project.
Clarifying the correlation between maintenance temperature and strength development, revealing the influencing mechanism, and formulating optimization strategies are of great significance for improving engineering quality, which is also the core purpose of conducting relevant research.
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Common cracks in concrete beams and slabs
During the construction phase, the early concrete strength was low, and the formwork and steel bars were stacked on the beams and slabs too early, causing deformation and cracking due to the load.
When the concrete strength is low, removing the formwork too early can cause cracks due to the self gravity of the structure.
Therefore, during the construction process, it is not advisable to stack steel bars and formwork for loading too early.
The dismantling of concrete structures shall be strictly carried out in accordance with relevant standards to avoid severe cracks in concrete beams and slabs caused by premature dismantling, impact on young concrete, and insufficient steel reinforcement protection layer.
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Construction Specification for Installation of Concrete Drainage Pipes
Concrete drainage pipes are widely used in our daily lives, mainly for drainage and sewage treatment in urban areas.
Therefore, the installation and construction of concrete drainage pipes are particularly important.
So what is the installation and construction of concrete drainage pipes like? The installation process of concrete drainage pipes is relatively strict, and sufficient preparation must be made before construction.
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Discussion on the Internal Quality Control Technology of Autoclaved Aerated Concrete
Recently, a friend shared that the article they wrote is relatively simple, mainly because the target audience is mainly frontline production management personnel.
I will try my best to go a little deeper and hope that colleagues can correct me.
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Exploration of Key Technologies for Precast Concrete Buildings
This article provides a comprehensive analysis of precast concrete buildings, first introducing their narrow and broad definitions, mentioning core features such as standardization and scaling, as well as the development process from traditional to new technology systems in China.
It elaborates on mainstream structural systems such as precast frames and shear walls, as well as various types of precast components.
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What “ingredients” should be added to good concrete?
Four hours after the concrete pouring of the main side wall of Wenyang Road Station, Cao Wenwu had already stood next to the initially set side wall with a thermometer.
The numbers on the screen made him furrow his brow: the temperature of the C45P8 concrete core was 52.
9 ℃, while the surface was only 31.
8 ℃.
The temperature difference of 25 ℃ was like an invisible crack, growing bigger and bigger in his heart.
As the team leader of the concrete team in Section 06 of Qingdao Metro Line 15, this is not the first time we have encountered a similar situation this month.
Looking at the temperature measurement data that exceeded the standard, it was as if he could see the slow development of cracks inside the concrete, which was another challenge he and his team encountered in the trial of decorative concrete.
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