Construction Precast Development

In the field of civil engineering such as highways and bridges, concrete is the core building material, and its strength and stability directly determine the load-bearing capacity and service life of the structure.

As a common environmental degradation phenomenon in the service life of concrete, carbonation has a complex bidirectional effect on strength – it may increase surface strength in the short term, but also weaken overall structural performance in the long term.

A deep understanding of the intrinsic relationship between carbonation depth and concrete strength is of crucial guiding significance for engineering quality inspection, structural durability assessment, and maintenance decision-making.

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As the core load-bearing component of highway bridges, 35m box girders require concrete with high strength, high durability, and good construction and workability.

C50 concrete has become the mainstream choice due to its adaptability.

This article combines the practice of a 35m precast box girder project on a certain expressway, and based on the “Technical Specification for Construction of Highway Bridges and Culverts” (JTG/T 3650-2020), presents the complete process of mix design from design basis, parameter determination, step-by-step calculation to experimental verification, providing practical examples for similar projects.

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In the construction of cast-in-place concrete, there is a link that is easily overlooked but directly determines the quality of the project – beam formwork calculation.

Imagine: during pouring, the formwork suddenly “expands”, causing concrete to overflow along the gaps.

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This not only requires rework and repair, but may also pose a safety hazard.

In fact, as long as one masters scientific calculation methods, they can avoid such problems from the source.

Today, we will break down the core logic of beam side formwork calculation step by step, based on the latest specifications, to help you ensure the quality of construction!.

With the development of intelligent construction technology, 3D concrete printing (3DCP) has gradually moved from landscape art to structural engineering due to its advantages of automation, template free, and flexible forming.

The common forms of 3D printing structures currently include reinforced masonry structures, permanent formwork structures, and prestressed concrete segmental assembly structures.

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However, traditional permanent formwork structures have a large self weight, while prestressed assembly structures suffer from insufficient bearing capacity.

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China Cement Network Cement Big Data Research Institute recently conducted research on some concrete companies.

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According to market feedback, downstream construction sites generally lack funds, and demand is unlikely to improve in the short term.

The focus of mixing plant work is gradually shifting towards payment collection.

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Cement shrinkage is one of the important internal causes of concrete cracks, mainly including dry shrinkage and thermal shrinkage.

Dry shrinkage cracks are caused by volume shrinkage due to water evaporation after concrete has hardened.

These cracks usually appear as surface microcracks, and although their depth is limited, long-term exposure to the external environment may lead to further structural degradation.

Thermal shrinkage cracks are closely related to the release of hydration heat inside concrete, especially in large volume concrete.

Uneven internal and external shrinkage caused by temperature differences can lead to the formation of cracks, which often occur in the early stages after construction.

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If not controlled in a timely manner, they may evolve into more serious structural problems.

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Self compacting concrete refers to concrete that can flow and compact under its own gravity, completely fill the formwork even with dense steel bars, and does not require additional vibration.

The concrete needs to have good ability to pass through the gaps between steel bars without segregation.

The water cement ratio of high-strength concrete is relatively low, and there are many cementitious materials.

The characteristics of high fluidity and non segregation require concrete to have high viscosity.

However, the high-rise pumping of concrete requires it to have low viscosity.

High viscosity can lead to difficulties in concrete pumping, and in severe cases, it can even cause pipe blockage and bursting.

Therefore, how to balance the high flow state and non segregation requirements of high-strength self compacting concrete pumped from high-rise buildings with low water cement ratio and low viscosity is an urgent problem that needs to be solved.

Rebar Wheel Spacers

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Most concrete enterprises are private enterprises that adopt family style management and lack professional production management personnel, resulting in many loopholes in production management.

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Here, the author shares five common cases that occur in concrete enterprises with colleagues and proposes corresponding preventive measures, hoping to draw attention and prevent similar incidents from happening again.

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This process standard is applicable to the construction of ordinary concrete cushion layers for industrial and civil building floors (including first floor floors and floor floors), covering non special environmental scenarios such as residential buildings, office buildings, and general factories.

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Not applicable to the following scenarios:.

In the field of construction engineering, cost control of concrete has always been a top priority in project management.

Especially in winter construction or cold regions, the use of high-performance materials such as D50 frost resistant C40 concrete is becoming increasingly common, but its cost often causes headaches for construction workers.

Imagine a bridge project where the cost of concrete is out of control, resulting in an overall budget overrun of millions of yuan.

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This is not just a digital game, but also a real loss of profits.

Today, I will take you on a deep analysis of the material cost of D50 frost resistant C40 concrete, from basic concepts to actual calculations, step by step teaching you how to save money and increase efficiency.

Whether you are a project manager, technician, or material procurement personnel, this article can help you master core skills and avoid common pitfalls.

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