Concrete quality control is a systematic project that requires strict supervision at every stage from raw materials to curing.
The core operation can follow the following steps and key points:.
precast-tech
precast technology developments
Multi school joint publication of research paper in the top concrete journal Cement Concrete Comp.: proposing a new strategy for preparing
Recently, Professor Yang Jun, the State Key Laboratory of Mountain Bridge and Tunnel Engineering of Chongqing Jiaotong University, and associate professors Zhang Zhen and Du Jiang, master students, cooperated with Southeast University, Massachusetts Institute of Technology and Stevens Institute of Technology to publish a research paper entitled “Polypropylene associated carbon black grading on natural fine aggregates for highly conductive and petrochemical cement mortar” in the international well-known journal in the field of concrete.
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Key points of winter concrete construction technology and quality control
When the daily average outdoor temperature is below 5 ℃ for 5 consecutive days, or the daily minimum temperature is below 0 ℃, it enters the category of “winter construction”.
At this time, concrete is most prone to “early freezing damage”: the volume of water freezing expands by about 9%, forming microcracks inside.
Even if it is later subjected to normal temperature curing, its strength can never be restored to its unfrozen level.
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Research on the Design Method of Prestressed Concrete Pavement
The test section is located on the B ramp of the Lukou Interchange in Section B of the Nanjing New Airport Expressway (BK0+080-BK0+180), which is a connecting road between Lukou Development Zone and Ningli Highway.
The roadbed width is 19 meters, the pavement width is 14.
4 meters (2 × 7.
2 meters), the central divider width is 1.
6 meters, and the soil shoulder width is 1.
5 meters.
The total length of the test road is 100 meters, and the pavement width is 7.
2 meters (single width).
Use post tensioning method for construction.
The test road was completed on June 30, 1997, and the testing work will be carried out regularly for a long time.
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Construction plan for appearance quality control of precast T-beam concrete
As an experienced engineer who has been working on bridge construction sites for decades, I am well aware that the appearance quality of precast T-beams is not only a facade project, but also a direct reflection of their internal quality.
A T-shaped beam with a smooth appearance and uniform color often means that its internal quality can withstand the test.
The beams with honeycomb and pockmarks on the surface and staggered cracks may also have hidden quality hazards.
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Causes and Control Management Measures of Concrete Structure Cracks in Renowned Enterprises
Concrete cracks are a common problem in the engineering field, which can be divided into two types based on their properties: non stress cracks (temperature, shrinkage type) and stress cracks.
They not only affect the structural appearance and waterproof performance, but can also reduce the bearing capacity and shorten the service life in severe cases.
Therefore, it is necessary to control risks throughout the entire process.
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Technical requirements for adding asphalt surface layer on old cement concrete pavement
1、 Various diseases on the original concrete slab surface need to be treated, and the treatment plan will be determined according to the actual situation.
But the joints on the original concrete slab must be treated, the debris inside must be removed, and filled with pure asphalt.
In addition, a modified emulsified asphalt adhesive layer must be sprayed before laying asphalt concrete on the concrete surface.
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Concrete vibration has an “intelligent center”
If architecture is the backbone of a city, then concrete pouring is the blood that gives it life.
For a long time, the vibration and curing process in concrete pouring has been a pain point in construction management – the quality of vibration and curing is limited by worker experience, weather conditions, etc.
, which not only affects structural safety but also causes huge waste of manpower and material resources.
How to cure this stubborn disease? Recently, the reporter followed the builders of Zhongyuan Company of China Construction Third Engineering Bureau to visit the Henan Zhongyan Xuchang Tobacco Flavoring Warehouse project located in Xuchang to learn about the situation.
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China Construction Third Engineering Bureau Zhongyuan Company develops and promotes intelligent concrete vibration technology
China Construction Third Engineering Bureau Zhongyuan Company has successfully developed a key technology for intelligent control of concrete vibration and maintenance based on IoT gateway, and applied it to ongoing projects.
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Atlas of Identification of Safety Production Hazards in Construction (Cast in place Concrete Formwork Engineering)
The atlas is divided into two parts: data security risks and engineering entity security risks.
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