On the outer surface of concrete, a white, soft substance resembling fluff is often produced, which is called alkali leaching.
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precast-tech
precast technology developments
Three concrete companies have been filed for bankruptcy
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Cement and concrete usher in a new wave of price hikes!
The latest data shows that cement prices continued to rise in the first week of April, with a price increase range of 5-20 yuan/ton.
Salespeople have provided feedback that as we enter the second quarter, the domestic building materials industry chain is driven by cost and demand resonance, ushering in a comprehensive price increase cycle.
The high prices of coal and oil, as well as the rise in shipping costs, form rigid cost support.
Coupled with the concentrated resumption of construction projects in various regions, demand is recovering, and cement is the first to initiate a nationwide price increase.
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Did a concrete giant quietly make a lot of money last year?
In 2025, China’s cement production reached 1.
693 billion tons, a year-on-year decrease of 6.
9%.
Huaxin Building Materials achieved a sales volume of 61.
96 million tons of cement and clinker, a year-on-year increase of 2.
8%.
The gross profit margin of the cement business has significantly increased from 23.
75% in 2024 to 33.
57%, an increase of about 9.
82 percentage points, and has rebounded to the highest level since 2022.
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Global underwater concrete 3D printing technology breaks through multiple points, infrastructure enters a new stage of deep blue intelligent
Recently, research institutions and enterprises in countries such as the United States and Australia have successively released major achievements in underwater concrete 3D printing technology, covering deep-sea operation robots, non accelerating agent printing systems, and civilian scene landing projects.
The industry dynamics are exciting.
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Analysis of influencing factors and optimization strategies for concrete mix design
The principle of workability refers to the basic principle of uniform quality and compact formation of fresh concrete at each stage.
Its specific connotations include fluidity, cohesion, water retention, etc.
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Study on the influencing factors of compressive strength and average rebound value of concrete
Using 52.
5 grade ordinary Portland cement with a specific surface area of 3148m2/kg; 5mm to 25mm continuous graded crushed stone, with an apparent density of 2660kg/m3 and a fineness modulus of 2.
8 for ordinary river sand, with an apparent density of 2640kg/m3; Ordinary tap water; High performance polycarboxylate superplasticizer ME-1, with a water reduction rate of 25% and a solid content of 27%.
The dosage is adjusted according to the state of the concrete, so that the slump of the concrete is between 140mm and 160mm.
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When the age of forty encounters a downturn in the concrete industry
At the age of forty, encountering a downturn in the concrete industry is like holding a broken umbrella in a storm – both resisting the impact of the industry downturn and stabilizing the burden on the family.
This dilemma is essentially a triple combination of the downward trend of the concrete industry, age pressure, and family responsibilities, like a “checkpoint” sandwiched between family responsibilities and career difficulties.
When the industry downturn overlaps with the pressure of life stages, the helplessness of not daring to stop or retreat hides too much weight of reality behind it.
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Case analysis of point like cracking problem on concrete surface
In recent years, with the gradual shrinkage of mineral resources and the increasing efforts of national environmental inspections, concrete raw materials such as cement and sand have been in short supply, leading to a continuous rise in raw material prices.
This has also promoted the research and industrialization of industrial waste such as steel slag and tailings as raw materials in concrete.
The sources of industrial waste are complex, and using it in engineering projects without effective pest control and quality verification often poses significant quality risks and can easily cause significant economic losses.
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Standard practice for concrete drainage pipes
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The excavation section of the trench should comply with the requirements of the construction organization design (plan).
The undisturbed foundation soil at the bottom of the trench shall not be disturbed.
During mechanical excavation, a 200-300mm soil layer shall be reserved at the bottom of the trench for manual excavation to the design elevation and leveling;.