Construction Precast Development
Precast News From China
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The appearance quality of concrete is a direct reflection of its quality.
The uniformity and oiliness of the surface color of concrete are increasingly concerned by construction contractors and owners, and their requirements are also increasing.
It has gradually become an important economic factor.
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Concrete and reinforced concrete engineering is one of the sub items with the highest proportion of construction project cost (about 25% -35% of the total civil engineering cost), and the accuracy of its quantity calculation directly affects the accuracy of project cost.
The project content covers:.
In the laboratory of China Railway Ninth Bureau Group Engineering Testing Co.
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, groups of concrete test blocks make a dull sound under the press.
Weng Shuai’s gaze was focused, staring closely at the jumping data on the screen.
In the railway engineering testing and inspection industry, every data measurement and inspection report is related to the stability of steel rails, the safety of tunnels, and the durability of bridges.
“This 40 year old senior technician spoke calmly, with fingertips tracing through the dense inspection reports.
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Many people believe that stone powder in sand is harmful to concrete, so they try their best to remove it.
Little do they know, a moderate amount of stone powder can also have a positive effect.
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The concrete industry has undergone decades of development, and the mix design and production process have become relatively mature.
However, the current quality control of concrete still faces core difficulties – the quality of raw materials is uneven and fluctuates frequently.
If the mix ratio is not adjusted in a timely and accurate manner, it is easy to cause various quality problems.
For example, concrete mixtures are often blocked due to poor aggregate wrapping, segregation, bleeding, or excessive loss of slump over time; Fluctuations in raw materials may also result in substandard strength or large strength dispersion of concrete test blocks, leading to substandard engineering quality.
With the increasing efforts in environmental control, unstable raw material quality has become a norm in the industry.
Therefore, understanding the current status of raw materials, adapting production processes to fluctuations in raw materials, and improving concrete quality are of great practical significance.
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Sodium gluconate is mainly used as an efficient retarder in concrete, which can delay the setting time of concrete, improve workability, and have a small impact on strength development.
It is one of the commonly used chemical additives in concrete engineering.
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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”!.