Literature Sharing 68: Evaluating the compressive strength of concrete made from recycled concrete aggregates using machine learning methods

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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.

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The year-on-year expansion of losses! Concrete faucet is expected to incur a loss of 550-880 million yuan in 2025

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On January 20th, China Construction Western Construction Co.

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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.

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Multi school joint publication of research paper in the top concrete journal Cement Concrete Comp.: proposing a new strategy for preparing

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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.

Elephant Foot Ferrule

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Key points of winter concrete construction technology and quality control

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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.

Steel Chamfer

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Research on the Design Method of Prestressed Concrete Pavement

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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.

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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

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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.

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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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Concrete Video: The ‘Top Stream’ in the Concrete Industry: Ultra High Performance Concrete (UHPC)

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Ultra high performance concrete (UHPC) is a new type of cement-based composite material with ultra-high strength, ultra-high toughness, and ultra-high durability.

In the national standard “Ultra high Performance Concrete” (GB/T 31387-2025), it is officially defined as fiber-reinforced ultra-high strength concrete produced by using cement and mineral admixtures as cementitious materials, combined with aggregates, additives, high-strength micro steel fibers and/or non-metallic fibers, water, etc.

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