Construction Precast Development
Precast News From China
precast technology developments
Do you often have headaches about calculating the cost of concrete on construction sites? Especially for the most commonly used C30 concrete, how is the material cost calculated? Today, I will use the most straightforward way to thoroughly dismantle the material cost of ordinary C30 concrete, allowing you to go from “fuzzy estimation” to “precise control”! This article will show you step-by-step calculations, combined with real data and practical skills, to help you save money and worry.
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This series is based on a super large super high-rise and complex project, and has selected 28 high-quality construction plans for the project to share with everyone.
All the plans are illustrated with detailed and exciting content.
We hope everyone likes them.
This article is the third one.
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In the laboratory of Sichuan Provincial Highway Planning, Survey and Design Institute, researchers have successfully combined graphene oxide with nano chitosan to develop a rebound reducing sprayed concrete admixture suitable for high and low temperatures.
This material can form a barrier layer at the interface of concrete, reducing the internal porosity of concrete by 15-20%, effectively preventing the invasion of harmful substances such as moisture and chloride ions.
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At the construction site of the Yangtze River Diversion Project, a stunning achievement has been born! The concrete pouring of the main structure of the drainage channel for the civil construction and metal structure mechanical and electrical installation of the first bid of the Yangtze River Diversion Project has been successfully completed.
Its surface is bright and visible, like a huge “mirror”!.
In the first half of 2025, the concrete industry in Zhejiang Province has delivered a mixed answer under the dual pressure of policy dividends and market winter.
Despite steady progress in the province’s economy, with a year-on-year increase of 5.
8% in regional gross domestic product and a total output value of over 553 billion yuan in the construction industry, the concrete industry is deeply mired in a quagmire of low operating rates, frequent price wars, and a wave of corporate bankruptcies.
According to industry statistics, the number of concrete enterprises in the province decreased by 11.
16% in the first half of the year compared to the same period last year.
Among them, 72 enterprises were forced to withdraw from the market due to business difficulties, and the industry reshuffle accelerated.
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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.
However, traditional permanent formwork structures have a large self weight, while prestressed assembly structures suffer from insufficient bearing capacity.
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Concrete segregation not only affects construction, but also affects the uniformity of concrete.
If segregation occurs during the use of a concrete mixer, it can become very troublesome.
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Highways are the arteries of regional economy, and their service life directly determines maintenance costs and traffic safety.
Concrete, as the bonding material between road surfaces and bridge structures, has become the “shortest wooden board” for extending the lifespan of highways due to its durability.
Based on the review of the “normal service limit state durability” clause in current standards, this article summarizes the three major failure mechanisms of steel corrosion, alkali aggregate reaction, and carbonization, and proposes a fourth-order closed-loop strategy of “material selection – structural corrosion resistance – construction control – operation and maintenance”, providing a systematic solution for long-life cement concrete pavement.
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Ultra High Performance Concrete (UHPC) is a new type of fiber-reinforced cement-based composite material designed based on the theory of dense packing.
Its mechanical properties are superior to traditional concrete, with compressive strength generally above 120MPa and ultimate tensile strength greater than 7MPa.
At the same time, it has good bending toughness, resistance to chloride ion penetration, corrosion resistance, and fatigue resistance.
The raw materials for preparing UHPC mainly include cement, silica fume, quartz sand, quartz powder, water, steel fibers, and high-efficiency water reducing agents, with a water cement ratio typically ranging from 0.
18 to 0.
22.
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The temperature at different depths inside the cement concrete pavement varies with the temperature.
This change causes the cement concrete slab to exhibit a trend of expansion and contraction deformation.
When deformation is obstructed, expansion and contraction stresses or warping stresses are generated inside the plate.
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