precast-tech

Currently, the construction industry is accelerating its transition towards green and industrial development, with concrete PC components (precast concrete components) becoming a key driving force.

Crown Foot Anchor

The traditional on-site pouring mode is greatly constrained by natural factors, has a lot of construction waste, and is difficult to control quality.

On the other hand, PC components are precast in factories through standardized processes, covering types such as laminated floor slabs, precast exterior walls, stairs, beams and columns, just like standardized building parts, solving industry pain points.

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Ferrule Loop Insert

Quality of cement substrate: The type and proportion directly determine the compressive strength and chemical resistance of concrete.

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Plastic shrinkage often occurs in the semi fluid or plastic stage of concrete, which is caused by various factors such as settlement motion, capillary tension, early chemical shrinkage, and self shrinkage, resulting in changes in concrete volume.

Concrete Plate Anchors

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However, although polycarboxylate based admixtures have solved the requirements for high-rise pumping and durability of ready mixed concrete, they are highly sensitive to fluctuations in concrete raw materials and environmental conditions, leading to various problems during the construction of ready mixed concrete.

Concrete Plate Anchors

If there is a phenomenon of rebound in the slump of ready mixed concrete, especially in winter, this phenomenon is more common, and the ready mixed concrete mixing plant also solves it vaguely every time.

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According to Chapter 7 of the national standard “Code for Construction and Acceptance of Concrete Structures” (GB50204), based on local temperature data for many years, when the daily average outdoor temperature remains below 5 ℃ for 5 consecutive days, concrete construction should enter the winter season.

At this point, the first day when the temperature remains stable below 5 ℃ for 5 consecutive days is considered the initial day for winter construction.

Similarly, when the temperature rises, the end of winter construction is the day when the temperature remains stable above 5 ℃ for 5 consecutive days.

Swift Lift Foot Anchor

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This document specifies the test methods for the volumetric density, water absorption rate, compressive strength, axial compressive strength, static compressive modulus, flexural performance (flexural ratio ultimate strength, flexural ultimate strength, and flexural modulus), tensile strength, impact strength, anchor rod pull-out force, embedded bolt sleeve pull-out force, frost resistance, and shrinkage rate of non load bearing components of ultra-high performance concrete.

Plastic Nail Plate

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For a long time, many scholars have conducted in-depth research on other components of concrete, such as cementitious materials and additives.

Even for fine aggregates, due to the increasing scarcity of natural sand in recent years, research has been strengthened, leading to rapid development in the production and use of mechanism sand.

However, coarse aggregates, which are the largest volume component of concrete, have not received sufficient attention.

With the development of concrete technology, the requirements for concrete performance are also increasing, and the impact of coarse aggregates on concrete performance is becoming increasingly prominent.

A comprehensive and in-depth exploration of the characteristics of coarse aggregates on concrete performance has become an urgent issue for concrete workers.

Swift Lift Foot Anchor

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Transform thinking and shift the focus of work from post pouring testing and inspection to pre pouring mix design and raw material control, and integrate them throughout the entire construction process.

By optimizing technology and refining management, the pouring of high-quality concrete becomes “simpler and more controllable”, thereby naturally reducing the labor intensity of workers.

Concrete Plate Anchors

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In the concrete technology system, additives are the key materials for improving the performance of concrete, which has led to the misconception of the “omnipotence of additives” among some people.

Shuttering Magnet

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The earlier the curing period after pouring concrete, the greater the impact on the concrete.

In practice, it has been found that if a standard curing of 7 days can be guaranteed, the compressive strength of concrete at 28 days can basically reach about 90% of the standard curing.

If no curing measures are taken for concrete test blocks, the impact on the strength of low strength grade concrete is greater than that of high strength grade concrete.

The reason is that low strength grade concrete has low early strength, low compactness, and easier internal moisture loss, resulting in a decrease in later hydration degree.

The engineering entity structure is much larger than the test block, and the surface curing is insufficient.

The degree of decrease in internal concrete strength is smaller than that of the test block, but the loose and powdery phenomenon of the surface concrete directly leads to low rebound strength.

Steel Rebar Chairs

Taking C30 as an example, it is common for engineering entities to have a rebound strength lower than the standard curing specimen by more than 5MPa without curing.

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