precast-tech

The setting time is divided into initial setting time and final setting time.

The initial setting time is the time required from the mixing of cement and water until the cement slurry begins to lose its plasticity.

The final setting time is the time required from the mixing of cement and water until the cement slurry completely loses its plasticity and begins to develop strength.

The setting time of cement is of great significance in construction.

The initial setting time should not be too short, and the final setting time should not be too long.

Crown Foot Anchor

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With the development of society, high-strength and large volume concrete is widely used in the foundation slabs and bridge structures of super high-rise buildings.

High strength and large volume concrete not only needs to meet strength standards, but also needs to consider controlling the temperature difference between the inside and outside of the concrete, reducing hydration heat, and preventing concrete cracking caused by excessive temperature differences.

Magnetic Thread Disc

High strength and large volume concrete, especially concrete with a strength exceeding C50, has a high frequency of cracking problems.

Therefore, solving the problem of concrete cracking is currently the focus of crack resistance research.

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With the development of urban construction, commercial concrete has gradually replaced on-site self mixed concrete in construction projects.

The application of commercial concrete in engineering greatly improves the quality assurance rate of engineering entities, but at the same time, it also gives rise to some problems.

Due to the requirements of urban planning and the limitations of raw material transportation conditions, concrete mixing plants are basically distributed in suburban areas far away from urban areas.

Commercial concrete is transported from the mixing plant to the construction site, and the transportation distance is generally long.

In addition, some accidental factors such as urban traffic conditions, concrete site waiting, and mechanical failures often require several hours for concrete to be mixed with water and poured.

Metal Rebar Caps

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In addition to the specific provisions of the regulations, the winter construction period is divided into three stages to facilitate the management of concrete engineering construction from November 15th to March 15th each year.

Dog Bone Anchor

Different technical adjustment plans are formulated according to different temperatures.

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In urban beautification and landscape construction, building components that combine functionality and aesthetic value are crucial.

Lifting Socket

The precast concrete car stop launched by Yatai Building Materials has become an ideal choice for urban, road and bridge, garden and other scenes with its unique design and excellent quality.

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The evolution of engineering structural design in China from traditional empirical design to modern scientific design can be divided into three core stages: traditional empirical design, semi empirical and semi probabilistic design, and probabilistic limit state design.

Before the mid-20th century, China commonly used empirical design methods (such as engineering analogy method); From the mid-20th century to the 1980s, semi empirical and semi probabilistic design methods (such as safety factor method, allowable stress method, and damage stage design method) were gradually adopted; After the 1980s, the limit state design method based on probability theory was mainly adopted.

Erection Anchor

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(1) Most of them are cracks parallel to the steel bars, which can seriously cause concrete to break.

Spherical Head Anchor

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In water conservancy construction projects, the frequency of using large volume concrete is increasing, especially in projects such as large reservoirs, dams, bridges, and underground engineering.

Due to the characteristics of large volume concrete, such as thermal expansion, temperature difference stress, etc.

, it is easy to cause cracks, which affects the safety and durability of the project.

Therefore, temperature control and crack prevention measures are particularly important in the construction of large volume concrete.

Rebar Wheel Spacers

This article provides a detailed analysis and research on the temperature control and crack prevention issues in the construction of large volume concrete, explores the factors that affect concrete temperature control, and proposes a series of optimization measures based on modern technological means, including improvements in material selection, temperature control technology, construction processes, and other aspects.

The research results indicate that through reasonable temperature control measures, not only can cracks be effectively prevented, but the overall strength and service life of concrete can also be improved.

This study provides theoretical basis and practical guidance for temperature control and crack prevention of large volume concrete in water conservancy construction.

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(1) Cement: P · O 42.

Rebar Saddles

5 cement produced in Nanyang, Henan.

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[Abstract] This article explores the characteristics of commodity concrete production and quality control from the perspective of cement production.

Through the analysis of short process, multi-component, zero inventory, susceptibility, and timeliness of concrete, it is concluded that concrete, as a wet chemical reaction, has various properties in a dynamic process after mixing.

Therefore, quality control should focus on front-end process transformation and strengthen back-end performance prediction analysis, which is significantly different from cement production.

However, the two should learn from each other and provide innovative ideas for concrete quality control personnel, especially laying a foundation for cement enterprises to transform the thinking mode of practitioners in the concrete industry and achieve stable concrete quality.

Elephant Foot Ferrule

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