Reason analysis: This is due to repeated sand pumping in the river channel, with less fine sand and more pebbles.
The sand pumping personnel enlarged the sieve holes, resulting in an increase in pebbles.
.
Month: March 2026
Literature Sharing 68: Evaluating the compressive strength of concrete made from recycled concrete aggregates using machine learning methods
In today’s rapidly developing construction industry, the demand for concrete as a core building material continues to rise.
Subsequently, the massive accumulation of construction demolition waste and the increasing depletion of natural aggregate resources are driving the development of recycled concrete technology under the dual pressure of environmental protection and resource scarcity.
Although the application of recycled concrete aggregates (RCA) can effectively alleviate this dilemma, the compressive strength, as a key indicator of concrete quality, has the disadvantages of high consumables, high cost, and long cycle in traditional compression testing.
This article will share a study on using machine learning technology to predict the compressive strength of recycled concrete, providing a more efficient solution for engineering practice.
.
The year-on-year expansion of losses! Concrete faucet is expected to incur a loss of 550-880 million yuan in 2025
On January 20th, China Construction Western Construction Co.
, Ltd.
released its 2025 annual performance forecast, expecting a net profit loss attributable to the parent company of 550 million yuan to 880 million yuan, compared to a loss of 263 million yuan in the same period last year.
.
How to solve the difficulty of concrete quality control?
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:.
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.
.
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.
.
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.
.
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.
.
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.
.
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.
.