The crushing value index of aggregate refers to the ability of aggregate (artificial sand, crushed stone or pebble) to resist crushing under specified test conditions.
（JGJ 52－2006）。.
precast-tech
precast-tech
Concrete is the foundation of waterproofing! How to do the construction?
The heavyweight publication of ‘Waterproof Concrete Engineering’! Based on the principles of systematicness, practicality and progressiveness, this book comprehensively expounds the basic theory, design method, construction technology and quality acceptance standards of waterproof concrete engineering, so as to ensure the quality control of the whole process of waterproof engineering.
Readers can also scan the two-dimensional code in the book, view the supporting digital resources in the book, and further increase readability.
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What are the raw materials of foam concrete?
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Annual Events of the Concrete Industry in 2025
According to the industry trends for the whole year of 2025, the core theme of the concrete industry is to embrace “digitalization” and “green development”, while actively expanding the international market to cope with changes in market demand and the pressure of transformation and upgrading.
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What are the pain points in the concrete industry???
In recent years, China has increased its efforts in environmental governance and proposed a dual carbon strategy.
Strict control has been placed on mining and development, and river sand mining that affects river ecology and environment has been strictly restricted.
At the same time, the scale of infrastructure construction in China is constantly growing.
Due to the impact of the epidemic, the top priority for 2023 is to stabilize growth.
How to stabilize growth is to stabilize investment to stabilize growth, with a focus on infrastructure support.
High quality and effective investment in infrastructure has become the main focus of China’s stable economic growth in 2023.
In January 2023, the State Council executive meeting deployed to accelerate the implementation of major projects identified in the 14th Five Year Plan Outline and special plans.
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Literature Sharing 42: Bond slip behavior of steel bars in low strength concrete reinforced with CFRP: A machine learning based solution and
In earthquake prone areas, a large number of low strength concrete (LSC) structures have weak material mechanical properties, and the bonding performance between steel bars and concrete is easily damaged, seriously affecting the structural integrity and seismic resistance.
Carbon fiber reinforced polymer (CFRP) reinforcement technology, as an effective means to improve the performance of low strength concrete, has always been a research difficulty in predicting the bond slip behavior between steel bars and concrete after reinforcement in the engineering community.
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Current status and prospects of research on frost resistance of concrete
Concrete is susceptible to freeze-thaw cycles in cold regions, leading to structural degradation.
The frost resistance of concrete refers to the ability of concrete to withstand multiple freeze-thaw cycles in a saturated water state without damage.
Existing research is mostly based on macroscopic experimental indicators (such as strength loss, mass loss rate, dynamic elastic modulus, anti peeling ability, ultrasonic wave velocity loss, etc.
) to explore the frost resistance of concrete, but lacks microscopic and macroscopic correlation analysis.
This article systematically studies the mechanism of freeze-thaw failure, material and process optimization, and environmental coupling effects, in order to provide technical references for improving the frost resistance of concrete.
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The current situation and risks of the phenomenon of “single person laboratory” in concrete mixing plants
The personnel configuration of the mixing plant laboratory needs to be matched with the production capacity, testing items, and process complexity, to ensure compliance with the testing process, authenticity and reliability of data, and traceability of quality issues.
The personnel configuration of laboratories in mixing plants of different scales varies, and the functions of each position are irreplaceable.
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Mix proportion design of concrete mixture
People have adopted many different methods and developed several theories as the basis for concrete mix design.
I only need to mention a small part of it to awaken your memory.
Our current habit is (unfortunately, almost everyone does) to design concrete mix proportions based on experience, such as using a 1:2:4 mixture without considering the special types of raw materials and the amount of mixing water used, and with little or no consideration for the strength of the concrete being manufactured.
Undoubtedly, this method is very crude and primitive, and thoughtful engineers would not adopt it.
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Reasons and Management Strategies for Disputes over Quality Issues in Concrete Engineering
With the continuous advancement of urbanization and industrialization in China, the demand for concrete as the main material for infrastructure construction is increasing day by day.
However, factors such as uneven regional development, differences in ideas, lagging standards, and vague responsibility definitions have led to frequent incidents of engineering quality accidents and related disputes.
In order to improve the quality and safety level of engineering, ensure the safety of people’s lives and property, and promote the sustainable and healthy development of national engineering construction, the General Office of the Ministry of Housing and Urban Rural Development issued the “Notice on Key Rectification of Quality Problems in Urban Residential Engineering” in 2025.
Engineering quality not only affects industrial production efficiency and the safety of people’s lives and property, but also relates to social stability.
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