conpd0523

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.

Plastic Nail Plate

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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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.

Rebar Saddles

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 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.

Coil Loop Insert

The personnel configuration of laboratories in mixing plants of different scales varies, and the functions of each position are irreplaceable.

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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.

Crown Foot Anchor

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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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.

Rebar Wheel Spacers

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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Aggregate is a granular material that plays a filling and skeleton role in a mixture, including crushed stone, gravel, machine-made sand, stone chips, sand, etc.

PVC Chamfer

Coarse aggregate refers to crushed stones, broken stones, screened stones, and slag with a particle size greater than 2.

36mm in asphalt mixtures; In cement concrete, coarse aggregate refers to crushed stones, gravel, and broken gravel with a particle size greater than 4.

75mm.

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（1） The construction unit has not designated a pre mixed concrete production enterprise or directly purchased pre mixed concrete.

Edge Lift Anchor

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（2） The establishment of pre mixed concrete production enterprises and sub stations meets the requirements of qualification management regulations.

Precast Round Ferrule

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According to the requirements of GB 55030-2022 “General Code for Waterproofing of Building and Municipal Engineering”, the crack resistance measures for the roof fine aggregate concrete leveling layer/surface layer can be prevented and controlled from three aspects: material optimization, structural reinforcement, and construction measures.

Metal Rebar Caps

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The free water in the mixture affects the slump of concrete.

Cement hydration and water evaporation will consume free water, reduce water content, decrease the distance between particles inside the slurry, increase viscosity, and decrease the slump of concrete.

Lifting Anchor

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