Construction Precast Development
Precast News From China
precast technology developments
Concrete will produce load cracks when subjected to conventional static loads, dynamic loads, and secondary stresses, which mainly include direct stress cracks and secondary stress cracks.
Direct stress cracks are caused by stress generated directly by external loads, while secondary stress cracks are caused by secondary stress indirectly caused by external loads.
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The acceleration of industrialization has promoted the vigorous development of large-scale construction projects.
As an important carrier of building functions, the construction quality of large-area fine aggregate concrete flooring directly affects the overall performance and service life of buildings.
High quality fine aggregate concrete flooring can not only meet the load-bearing needs of industrial plants, logistics warehouses, and other places, but also effectively reduce maintenance costs in the later stage.
However, there are still many technical difficulties in the construction of large-scale fine aggregate concrete flooring, and it is urgent to establish a sound quality control system to ensure that the project quality meets the standards.
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The reasons for early cracking of commercial concrete are multifaceted.
Compared with ordinary on-site mixed concrete, commercial concrete has more early cracking and develops rapidly.
This is contrary to the development of modern commodity concrete.
Therefore, based on the characteristics of commercial concrete, we explore the causes of early cracking in commercial concrete, in order to better and effectively control the early cracking of concrete and improve its durability, reduce the maintenance of reinforced concrete structures, and have a significant impact on the sustainable development of national infrastructure.
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Concrete is a general term for engineering composite materials that use cementitious materials to bond aggregates into a whole.
It is mainly composed of cementitious materials, water, sand, and stone mixed in appropriate proportions.
Different amounts of admixtures and additives are added according to the environment, usage conditions, and concrete performance requirements of the project.
After mixing, pouring, vibration molding, curing, and other processes, it solidifies and hardens for a certain period of time to form artificial stone with strength.
The durability of concrete is influenced by various factors.
This article discusses the sub project of concrete in the basement of a tower in a certain industrial park in Longhua District, Shenzhen.
The project covers an area of 200000 square meters and includes production plants, canteens, laboratory buildings, energy buildings, auxiliary buildings, underground parking garages, etc.
Based on the characteristics of the project, analyze the factors affecting the durability of concrete from four aspects: raw material selection, environmental factors, curing conditions, and construction technology, and propose corresponding measures.
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Foundation and cofferdam: sinking well, caisson, cofferdam bottom sealing, underwater continuous wall, large-diameter cast-in-place pile.
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The strength grade of concrete directly determines the building’s bearing capacity, safety, and applicable scenarios.
C800 grade concrete is currently known to have the strongest compressive performance in the world in the laboratory.
Its performance breaks through conventional knowledge and is the forefront benchmark of concrete material technology.
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2 Ordinary concrete unit engineering is divided into two processes: preparation and pouring.
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(After following the official account and sending “2025”, the download link will be sent automatically.
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The storage folder is number 72.
The concrete panel of a certain hydropower station suffered surface cracking due to excessive sliding mode lifting speed, and the rework cost was 120000 yuan; The failure to calibrate the prestressing equipment in a certain project resulted in the breakage of steel strands and the scrapping of the entire concrete warehouse – these accidents are all rooted in the failure to fully understand the 2025 version of the “Construction Quality Acceptance Standards for Water Resources and Hydropower Engineering Unit Projects Part 2: Concrete Engineering” (SL/T 631.
2-2025).
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Boss, finance, and business leaders who are still issuing concrete invoices at a rate of 3%, please stop immediately! The first industry blow at the beginning of 2026 has already hit the entire concrete track hard – the simple taxation policy that has been in use for nearly 20 years has been officially abolished, the 3% tax rate has been completely phased out, and the 13% value-added tax general taxation has been fully implemented.
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