Recently, the “Concrete Mix Proportion and Loss Dataset” of CCCC First Harbor Engineering Co.
, Ltd.
Fifth Engineering Co.
, Ltd.
was registered and listed on the Northern Big Data Trading Center and Hebei Provincial Data Trading Service Center.
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precast-tech
precast technology developments
Watering and maintenance of concrete for rural house construction [Part 2]
Preface: Poor curing of concrete leads to cracking, sanding, and even watering is useless.
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How do point like explosions occur on the surface of concrete construction
Visual survey: Conduct a comprehensive scan of the surface of concrete components, record scattered bulges and collapse points, and confirm that the diameter of the explosion points is mostly between 1-8cm, and powdered aggregates are often visible in the center.
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Research on Preparation and Application of TiO2 Photocatalytic High Brightness Polyurethane Concrete Tunnel Pavement
Highway tunnels are typical semi enclosed traffic spaces, where the “black hole/white hole” effect at the entrance often coexists with exhaust gas retention, long-term affecting driving safety and environmental quality.
By the end of 2024, there will be 28700 operating highway tunnels in China, and the proportion of long and large tunnels will continue to rise.
The current tunnel pavement is still dominated by hot mix asphalt mixture, which is sensitive to temperature and service environment.
Under the combined effects of high humidity, high temperature, and exhaust corrosion, it is prone to diseases such as rutting, cracking, and aging, making it difficult to meet the higher requirements for durability, greening, and functionalization of tunnel pavement.
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Is there a total cracking in high-temperature concrete curing during summer? Teach you 3 ways to save money
The freshly poured concrete has a smooth and tidy surface, and when I saw it the next day, fine lines crawled from the corner of the wall to the middle of the board, like spider webs.
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Analysis of the selection of reasonable sand ratio for concrete
As is well known, sand and stone used in concrete require good gradation in order to obtain smaller porosity and a strong skeleton, thereby improving the technical performance of concrete and saving costs.
Many technicians emphasize the grading of sand and stone separately, while neglecting the overall grading of sand and stone mixtures.
In fact, considering the economy and volume stability of concrete, a small amount of cementitious material slurry is needed to fill as many gaps as possible between coarse and fine aggregate particles and bond them together.
This means that the aggregate should have a continuous distribution of particle groups from sand to gravel to reduce the gaps after mixing.
That is, in addition to considering the individual gradation of coarse and fine aggregates, concrete should also consider the overall gradation of coarse and fine aggregates.
The basic idea of calculating sand ratio using the overall grading method of sand and gravel is that the overall grading of the sand and gravel mixture is best when the bulk density of the sand and gravel mixture is at its maximum.
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Introduction to Basic Knowledge of Concrete (Part 1)
Ready mixed concrete refers to a concrete mixture consisting of cement, aggregates, water, and additives, mineral admixtures, and other components added as needed in a certain proportion, which is measured and mixed at a mixing plant, sold, and transported by transport vehicles to the place of use within a specified time.
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Anti clogging pipe technology for super high-rise concrete pumping
The Western International Financial Center project is located on Dongdajie in Jinjiang District, Chengdu, with a total construction area of 293000 square meters.
It consists of four super high-rise buildings and is a comprehensive super high-rise building that integrates office, commercial, hotel, and residential functions.
The 1 # main tower has 56 floors and a height of 240.
85m; the 2 # bank building has 39 floors and a height of 169.
95m; the 3 # residential building has 46 floors and a height of 148.
10m; and the 4 # residential building has 47 floors and a height of 149.
55m.
This project is a complete basement with 5 floors and uses raft foundation.
Buildings 1 # and 2 # have a frame core tube structure with a complex and inclined inward shape, and the exterior walls are made of glass curtain walls; Buildings 3 and 4 are shear wall structures, with aluminum curtain walls on the exterior walls.
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Literature review | Durability of geopolymer concrete under carbonation and chloride salt erosion
Ordinary Portland Cement (OPC) is the most widely used basic building material in civil engineering, but the energy consumption and environmental problems caused by cement production are becoming increasingly prominent.
It is estimated that the CO ₂ emissions from cement production account for about 5% -8% of global anthropogenic emissions, therefore developing low-carbon building materials to replace OPC is considered an effective way to reduce carbon emissions.
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Heavy achievements! Concrete strength prediction reaches the top of the first zone! The field of civil engineering has reached a new high!
In recent years, machine learning has quietly rewritten the underlying gameplay of concrete material development.
Random Forest and XGBoost automatically identify key factors that affect strength from dozens of matching data sets; SVR uses kernel functions to capture nonlinear interactions between components; MLP neural network provides end-to-end strength prediction directly from the mix proportion; Bayesian optimization no longer relies on manual trial and error, allowing the algorithm to search for the optimal hyperparameters on its own; SHAP interpretability analysis eliminates the “black box” of the model and clarifies “why this ratio is strong and that ratio is weak”.
At the forefront, physical information neural networks have begun to embed hydration reactions and strength development laws into the network, allowing for physical consistency even in small samples.
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