precast-tech

When the “Work Plan for Stable Growth in the Building Materials Industry (2025-2026)” jointly issued by the Ministry of Industry and Information Technology and six other departments was officially implemented, the concrete industry, which was once mired in overcapacity, received strong policy stimulus.

Spherical Head Anchor

The triple focus of “expanding demand, optimizing supply, and strengthening innovation” in the plan is activating the market from multiple dimensions such as infrastructure, urban renewal, and industrial upgrading, ushering in the dawn of demand explosion for the concrete industry with a production capacity utilization rate of less than 25% for two consecutive years.

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Walking in newly built cultural venues, internet famous commercial districts, or high-end residential communities in recent years, you may be attracted by a “special kind of concrete” – it is not covered by heavy paint, with delicate texture patterns on the surface, presenting natural cement colors or a faint warm luster.

It has both the solid texture of concrete and the exquisite sense of design.

Cast in Loop

This is the highly sought after “plain concrete” in the current design circle, an innovative application that transforms traditional concrete and quietly rewrites the aesthetic expression of architecture and space.

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When a mixing plant in Chongqing quoted a “fracture price” of 220 yuan/cubic meter for C30 concrete, this figure was already far below the cost line of around 300 yuan, resulting in a loss of nearly 100 yuan per cubic meter sold.

This kind of “suicidal quotation” is not an isolated case.

In Yichang, the 19.

3% capacity utilization rate has led companies to engage in cost line shopping; In East China, the price of concrete has dropped by 10 yuan per cubic meter within six months, and 64 regions across the country have simultaneously fallen into the quagmire of price decline.

The Chinese concrete market is experiencing the most intense industry competition with a scale of trillions of yuan.

Steel Chamfer

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This article is selected from Professor Qin Weizu et al.

Pfeifer VS Box

‘s translation of “Visible and Invisible Cracks in Concrete”.

With the continuous development of highway and railway engineering construction in China, qualified natural sand that can be mined is becoming increasingly scarce, and the use of machine-made sand has become an inevitable trend in the development of engineering construction.

As the most basic raw material for engineering construction, machine-made sand is more in line with national low-carbon and environmental protection requirements and has low cost compared to river sand.

It has a wide application prospect.

However, the content of machine-made sand stone powder is significantly higher than that of river sand.

The stone powder content has a great impact on the performance of concrete mixtures and the quality of engineering entities.

Controlling the stone powder content within a certain range plays a filling role in concrete and is conducive to concrete quality control.

However, if the stone powder content exceeds the limit, it will have a counterproductive effect.

Plastic Nail Plate

Therefore, when using machine-made sand to mix concrete, it is very important to find the optimal stone powder content for on-site concrete quality and cost control methods.

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The size of the crushing value index (coarse aggregate, fine aggregate) directly reflects the mechanical properties (strength, crushing resistance) of the aggregate, which has a significant impact on the strength, workability, durability, and construction performance of concrete.

Moreover, the sensitivity of crushing value varies among different strength grades and types of concrete.

Shuttering Magnet

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Zone I (coarse sand) sand is suitable for high-strength concrete (≥ C50) or large volume concrete (reducing cement dosage and hydration heat).

Zone II (medium sand) has the widest applicability and can be used for C30~C60 concrete and pumped concrete (with easy control of fluidity).

Lifting Socket

Zone III (fine sand), suitable for low strength concrete (≤ C25) or scenarios requiring high water retention (such as thin-layer pouring), but the dosage needs to be controlled to avoid deterioration of workability due to excessive specific surface area.

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Workability refers to the ease of construction operations (mixing, transportation, pouring, compacting) of concrete mixtures and the ability to achieve compact, uniform quality, no segregation, and no bleeding.

Elephant Foot Ferrule

The workability generally includes three aspects: fluidity, cohesiveness, and water retention.

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China Metallurgical Group Corporation (MCC) (60161801618.

HK) signed a major engineering contract worth up to 3.

53 billion yuan in the first half of 2020.

The full name of the project is “Zhejiang University Hangzhou International Science and Technology Innovation Center Project Phase I EPC Project”, which was won by MCC Communications Construction Group Co.

, Ltd.

(referred to as “MCC Communications”), a subsidiary of MCC.

Recently, it was discovered during the acceptance stage that there were quality issues with the concrete strength of structural components that did not meet the standard.

They were required to rectify within a specified period of time.

Concrete Lifting Clutch

If the rectification fails, the project will not be accepted.

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This experiment focuses on the water demand ratio index of fly ash, and conducts concrete performance tests on six different water demand ratios of fly ash collected from the Fujian region.

The influence of fly ash water demand on various properties of concrete is studied, and the fineness, loss on ignition and other performance tests of fly ash are conducted to explore the factors affecting the water demand of fly ash.

Measures for controlling and improving the water demand of fly ash are proposed, providing reference for the quality control of concrete production.

Rebar Bolsters

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