Gas accumulation in concrete, premature fading, lack of protection before setting, improper curing, etc.
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precast-tech
precast-tech
Understand Ultra High Performance Concrete (UHPC)
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The optimal time and control points for cutting joints in concrete pavement.
Why do concrete pavements need to be cut? When concrete solidifies, it will continue to shrink and generate stress.
Without actively reserving cutting joints to guide release, the road surface will randomly crack irregularly.
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The new national standard will be implemented in August, and the concrete admixture industry will face a “safety test”
The Safety Technical Specification for Concrete Admixtures (GB 46039-2025) will be officially implemented.
This is the first time that the country has issued special mandatory safety technical specifications for the field of additives – not recommended standards, but a bottom line that must be implemented.
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Concrete underwater 3D printing: hybrid design driving force mapping for enhanced performance
The gas permeability is measured using argon gas in rigid triaxial cells suitable for core diameters of 110 millimeters (L) and 65 millimeters (T).
Side sealing to enhance one-dimensional flow; The surface is overlaid and compressed onto the O-ring.
The test is conducted at 20 ° C.
The circuit is composed of a known upstream control volume as shown in Figure 3.
According to the permeability range of the sample, the volume can be selected from four types.
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Frontline Chief Engineer Talks about Concrete Production and Construction under High Temperature Weather
The rationality of mix design is based on a certain quality of raw materials, theoretical calculations, and multiple trial mixes to meet the process of strength, construction performance, workability, durability, and economic performance.
This also requires concrete designers to fully understand the factors that affect strength, the conditions that affect construction and work performance, the weight of durability and cost, and to choose raw materials reasonably and selectively.
But often the mixing plant needs to meet the performance requirements of the concrete based on the materials used, without any selectivity, which forces the design to meet the requirements but is difficult to achieve.
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The influence of physical properties of sand on the quality of concrete
The different forms of clay in sand have varying impacts on concrete.
If clay is wrapped around the surface of the aggregate, it will be detrimental to the bonding between the aggregate and cement, affecting the strength and durability of the concrete; If clay exists in loose particle form, due to its fine particles and large surface area, it will increase the water consumption of concrete.
Especially the unstable volume of clay, which shrinks when dry and expands when wet, can have a destructive effect on the dry and wet volume changes of concrete.
Overall, when the mud content of sand exceeds the standard, it will have adverse effects on the strength, shrinkage and creep, frost resistance, and abrasion resistance of concrete.
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Cement Network Data: Price Statistics of C30 Concrete in Various Regions of China in June 2026
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This article is reprinted from China Concrete and Cement Products Network, and the cover image is sourced from the internet.
Concrete painting, the Renaissance of architecture: giving concrete a new soul
In the history of human architecture, every true innovation is not simply adding a material, but redefining the relationship between architecture and people.
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How to define responsibility for quality problems in concrete
Once a concrete quality accident occurs, although often the disadvantaged concrete enterprises suffer losses.
The reason for this phenomenon is that most concrete companies have the phenomenon of advance payment.
If there are quality problems, regardless of whether the concrete company recognizes them or not, the construction unit will directly deduct money.
Secondly, the market competition is fierce, and concrete companies want to continue supplying concrete, fearing losing the market.
But when there is a concrete quality accident, it is also necessary to clarify the responsibility.
According to the provisions of “Ready mixed Concrete” (GB/T14902-2012), delivery inspection should be carried out, which is the boundary line for defining responsibility.
The specific principle of responsibility can refer to the following points and analyze specific issues on a case by case basis.
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