conpd0523

With the increasing scarcity of natural sand resources and the continuous improvement of environmental protection requirements in construction, machine-made sand has gradually become an important raw material for concrete production.

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However, in the production process of mechanism sand, there are common problems such as excessive particle edges, rough surface, and discontinuous gradation, which lead to high water demand and poor workability of concrete, as well as significant strength fluctuations.

At the same time, cement, as the main cementitious material in concrete, generates a large amount of carbon dioxide emissions during its production process, causing serious environmental burden.

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In coastal mudflat, saline land areas or around northern salt lakes, concrete structures not only bear loads, but also face multiple attacks of chemical corrosion and freeze-thaw cycles.

The combination of these three factors, known as’ multiple failure factors (MDF) ‘, poses a serious challenge to the durability of concrete.

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Recently, the Ministry of Housing and Urban Rural Development publicly solicited opinions on the national standard “Test Method for Ultra High Performance Concrete (Draft for Comments)”.

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The Municipal Engineering Center of Zhangzhou Housing and Urban Rural Development Bureau uses C40 black concrete with steel fibers, which has the advantages of high temperature anti rutting and low temperature anti cracking.

It is planned to slightly improve the asphalt road junctions and turns.

Compared with ordinary concrete, steel fiber C40 black concrete not only increases the tensile strength, but also shows good toughness, is easy to operate and control, improves maintenance efficiency, saves maintenance costs, and is a good measure for the sustainable development of road maintenance.

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Shandong Expressway Changtong Road Bridge Engineering Co.

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Weifang 261500, Shandong.

As the most widely used building material today, concrete has the advantages of high compressive strength, good durability, and low cost.

However, its inherent brittleness leads to the formation of microcracks during use, which not only reduce the mechanical properties of the material but also provide channels for harmful substances to invade, accelerating structural aging and steel corrosion.

The traditional repair method relies on manual detection and external intervention, which is inefficient and difficult to deal with internal micro damage.

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The emergence of self-healing concrete provides a new approach to solving this problem.

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Winter construction is an inevitable engineering reality in cold regions, and as the most important building material, the performance control of concrete in low-temperature environments becomes the key to engineering quality.

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Elaborate on the basic principles, freezing mechanisms, and curing processes of winter concrete construction, providing theoretical support for scientific research and engineering practice.

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The problem of floor cracks in large concrete buildings has always been a common challenge in construction.

The reason why most concrete large-scale buildings have the above-mentioned cracks on their floors may be because during the construction and pouring of concrete, the construction was not completed according to the corresponding standards or the concrete materials used did not meet the relevant requirements in terms of strength, tensile strength, flatness, etc.

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In response to this issue, this article takes the No.

1 factory building of Weichai Fudi Battery Phase I Construction Project as the research object, and focuses on analyzing the key technologies for controlling cracks in super large floor concrete.

By optimizing design and materials, standardizing construction processes, and implementing refined maintenance measures, the aim is to solve crack problems, improve engineering quality, and provide technical references for similar projects.

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With the development of modern construction technology and the continuous expansion of engineering scale, the engineering field has put forward higher requirements for the performance of concrete.

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As an important component of concrete, the physical properties, chemical composition, and harmful substance content of sand and gravel aggregates will have a significant impact on the strength, workability, durability, and other aspects of concrete.

Therefore, in the field of engineering construction, it is not only necessary to have a deep understanding of the impact mechanism of sand and gravel aggregates on concrete performance, but also to find scientific and rigorous quality control measures to ensure that the quality of sand and gravel aggregates meets engineering requirements.

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