During the production process of aerated concrete, steam curing cracks have always been a difficult problem for many manufacturers.
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precast-tech
precast-tech
Silane impregnating agent: How does the “invisible raincoat” of concrete protect steel bars?
Seawater, deicing salt, and high humidity water vapor will continuously penetrate inward through the pores of concrete.
Once they come into contact with the internal steel bars, they will cause corrosion, volume expansion, and ultimately lead to concrete peeling, cracking, and flaking, greatly shortening the service life of the building.
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July 8th National Cement, Sandstone, and Concrete Market
On July 8th, the national cement market was mainly down, with Qingdao, Weihai, Yantai, Zhengzhou, Tangshan, Qinhuangdao, and Xi’an falling by 5-20 yuan/ton.
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Pre mixed concrete information price in June 2026
According to the Notice on the Revision of the Shaanxi Province Engineering Cost Information Material Information Price Catalog issued by the Shaanxi Provincial Construction Engineering Cost Service Center, starting from February 2025, the information price of ready mixed concrete will be re included in the Shaanxi Engineering Cost Information and published in the form of a special report.
According to the “Value Added Tax Law of the People’s Republic of China” and the “Announcement on the Connection of Value Added Tax Preferential Policies after the Implementation of the Value Added Tax Law” (Announcement No.
10 of 2026 by the Ministry of Finance and the State Administration of Taxation), the tax inclusive price of ready mixed concrete will be published at a general taxpayer tax rate of 13% starting from February 2026.
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What issues should be noted when pouring pile foundation concrete underwater?
This includes the inspection of various mechanical equipment (such as mixing equipment, tank trucks, cranes, conveying pumps, etc.
), as well as the inspection of supports, hoppers, conduits, hole cleaning equipment (including air compressors, air ducts, etc.
), concrete transport vehicles, etc.
used for pouring concrete, to ensure their normal use during construction.
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Concrete creep testing: using science to predict the future
As the most common building material, concrete’s mechanical properties include not only static parameters such as strength and elastic modulus, but also deformation characteristics under long-term bearing conditions.
Creep refers to the irreversible deformation of concrete that gradually occurs over time under constant stress.
This phenomenon is particularly important in long-term load-bearing structures such as bridges, large buildings, and dams, as it can lead to structural deformation, cracks, and even safety hazards!.
High performance concrete series – ultra-high toughness cement-based composite materials
ECC = Engineered Cementitious Composite, In 1992, Professor Victor C.
Li from the University of Michigan proposed that the matrix is cement slurry or mortar (note: does not contain coarse aggregates, similar to UHPC), with fibers (usually PVA polyvinyl alcohol fibers, but also PE polyethylene fibers) as reinforcement materials, designed through micro mechanics and fracture mechanics principles – this sentence is key.
ECC is not simply “adding more fibers to concrete”, but a material system designed in reverse from the mechanical parameters of fibers, matrix, and interface, which is also the origin of the term “Engineering Design”.
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Literature Express | Carbon Footprint Study of Ordinary and High Strength Concrete Used in Low rise and High rise Buildings
The construction industry is an important source of greenhouse gas emissions, with cement production accounting for approximately 7% of global carbon emissions, of which 95% come from limestone calcination.
Traditional strategies focus on using auxiliary cementitious materials to replace some of the clinker in order to reduce carbon emissions per unit volume of concrete; The performance strategy reduces the amount of structural materials used by using high-strength concrete.
However, the carbon emissions during the production stage of high-strength concrete are higher, and its comprehensive carbon footprint needs to be evaluated specifically based on the type of building.
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Literature Express | Low carbon Enhancement of Fly Ash Geopolymer Concrete: Lateral Deformation, Microstructure Evolution, and Environmental
Cement production is one of the main industrial sources of carbon emissions, while fly ash is a byproduct of coal-fired power plants, occupying land and polluting the environment.
FGC utilizes fly ash to form geopolymer cementitious materials through alkali activation, which can significantly reduce the amount of ordinary Portland cement used and thus lower carbon emissions.
This is of great significance for the resource utilization of industrial solid waste.
However, traditional FGC requires high-temperature steam curing to achieve optimal mechanical properties, and energy consumption and carbon emissions offset some environmental benefits, which limits its engineering promotion and application.
The addition of a small amount of OPC can achieve the solidification and hardening of FGC at room temperature, which is a key technical route to solve this contradiction.
However, its impact on the mechanical properties and microstructure evolution of FGC still needs to be systematically studied.
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The relationship between methylene blue of sand and mud content and its influence on the dosage of concrete water reducing agent
The main sand and gravel system parent rock is limestone in four material yards: Xinyan, Huajie, Machangping, and Xinjie; There are five material yards with dolomite as the parent rock: 771, Xiangyuan, Madaobian, Lubi, and Wujiayuan.
The experiment mainly conducted a relationship test between methylene blue and mud content in six sand and gravel production sites, established a formula for the relationship between methylene blue and mud content, calculated the mud content of the sand from it, and calculated the cost of water reducer per cubic meter of concrete based on the different dosage of water reducer used for different mud contents.
In addition, a comparative experiment was conducted on the water reducing agent dosage between the medium stone backfilled sand (medium stone backfilled sand with relatively low mud content) and ordinary machine-made sand (produced from ordinary raw materials) in the Ma Dao Border Material Yard; Conduct comparative tests on the addition of water reducing agents and compressive strength results of different methylene blue sands in the new rock material yard using the same concrete mix ratio.
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