Recently, the Jiangsu Provincial Department of Housing and Urban Rural Development issued a notice on strengthening the supervision of concrete quality in housing and municipal engineering, which will be implemented from the date of issuance.
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Research on the Influence of Cement Properties on Concrete Properties
Abstract: The performance of cement has a significant impact on the quality and properties of concrete.
This article studies the influence of cement on the performance of concrete and proposes some basic requirements for cement during concrete construction.
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How to pour concrete with a difference of one grade?
When the concrete strength of columns and walls is two or more grades higher than that of beams and slabs during the construction process, separation measures should be taken in the boundary area.
Both the construction and supervision units recognize this situation, and the construction unit generally takes the following measures to intercept it.
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What is the ‘single person laboratory’ of concrete mixing plant overdrawn?
According to the regulatory requirements, the mixing plant laboratory should be equipped with professional personnel that match the production capacity.
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The Influence of High Proportion Mineral Admixtures on the Carbonization Performance of Concrete
Mineral admixtures such as fly ash and slag powder can not only improve the workability and mechanical properties of concrete, but also significantly enhance its durability.
However, the extensive use of mineral admixtures has a complex impact on the carbonation performance of concrete.
On the one hand, the active substances in the admixtures combine with the hydrated calcium hydroxide of cement, reducing the content of alkaline substances in the concrete and accelerating the carbonation process; On the other hand, the addition of admixtures can effectively improve the compactness of concrete materials, enhance the microstructure of the interface transition zone, reduce the penetration of carbon dioxide, and thus slow down the carbonation rate.
Therefore, understanding the influence of mineral content on the carbonation performance of concrete materials and revealing the micro mechanism of mineral admixtures on concrete carbonation behavior is of great significance for optimizing concrete mix proportions, improving the service life of concrete structures, and reducing carbon emissions in the construction industry.
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Discussion on the influencing factors of rebound method for detecting compressive strength of concrete
Before testing, a calibration test of the rebound instrument must be conducted.
The quality and testing performance of the rebound instrument directly affect the accuracy of concrete strength estimation.
Only a rebound instrument with good performance can ensure the reliability of the test results.
The calibration of the rebound instrument should be carried out under dry conditions with a room temperature of 5 ℃ to 35 ℃.
It should be struck vertically three times on a standard steel anvil with a Rockwell hardness HRC of 60 ± 2, and the average calibration value should be 80 ± 2.
Otherwise, the rebound instrument must be adjusted or calibrated.
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Research on the design of cement concrete mix proportion and strength test detection
As the main material of highway pavement, cement concrete directly affects the service life and driving safety of the pavement.
The mix design is a key link in controlling the performance of cement concrete, involving multiple influencing factors, including sand ratio, water cement ratio, and strength control.
Different grades of highways have different performance requirements for cement concrete, and the mix design needs to consider specific usage conditions.
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Concrete cracks and prevention measures in construction engineering
As one of the most commonly used materials in construction engineering, the stability and reliability of concrete performance directly affect the quality and safety of the project.
However, in the actual construction process, the problem of concrete cracks has always plagued engineering personnel.
The appearance of cracks not only affects the aesthetics of buildings, but may also weaken the load-bearing capacity of structures and pose safety hazards.
Therefore, in-depth research on the causes and prevention measures of concrete cracks is of great significance for improving the quality and safety of construction projects.
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How to effectively control the quality of pre mixed concrete enterprises
Due to the fact that the final quality of ready mixed concrete cannot be fully inspected during the production process, its quality control has certain particularities and can only be achieved through strict process control to control the final quality of concrete.
The process control of concrete quality can be carried out according to the following ideas: selection and control of raw materials → quality control of raw material entry → quality control of production process → quality control of transportation, pumping and pouring → quality tracking and follow-up → statistical analysis → summarizing experience and continuously improving.
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Calculation Rules for Quantity of Concrete and Reinforced Concrete Engineering (1)
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