Construction Precast Development
Precast News From China
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Those who study engineering, especially civil engineering related majors, as well as those engaged in civil engineering project design, construction, supervision, and budgeting, inevitably have to deal with the word “tong” frequently.
Speaking of the word ‘concrete’, it’s a bit awkward.
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According to the Announcement of the Ministry of Finance and the State Administration of Taxation on the Connection of Value added Tax Preferential Policies after the Implementation of the Value added Tax Law, starting from January 1, 2026, general taxpayers who sell self-produced commodity concrete made of cement as raw material cannot choose to use the simplified tax calculation method for taxation, and can only apply a tax rate of 13%.
The introduction of the new policy has attracted widespread attention in the industry.
The following is a summary of research feedback on some concrete enterprises in Central China.
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The particle size of stones directly affects the strength, workability, and compactness of concrete.
It is not necessarily better to have larger or smaller stones.
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The promotion of recycled aggregate concrete (RAC) is an important way for the construction industry to achieve carbon neutrality and sustainable development, but it has problems such as reduced mechanical properties and insufficient bonding performance with reinforcement, which limits its structural applications.
Basalt fiber-reinforced polymer (BFRP) reinforcement has become a high-quality alternative material to traditional steel bars due to its corrosion resistance, lightweight, and high strength.
Fiber addition is a common method to improve the performance of recycled aggregate concrete.
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Concrete mix design is a core skill essential for technical personnel in concrete enterprises, and it is also a topic that every concrete practitioner needs to delve into.
Whether it is the repeated debugging of front-line technicians or the theoretical research of experts and scholars, ultimately a set of design methods that are suitable for their own production conditions and engineering needs needs needs needs needs to be found.
Various mix design schemes have been proposed both domestically and internationally, each with its own advantages and disadvantages.
However, it is still difficult to find a universally applicable and scientifically unified optimal solution.
Therefore, the core essence of concrete mix design lies in the principle of “there is no fixed method, the key lies in finding the right method”.
The best design is suitable for the production of one’s own enterprise and meets the actual needs of the project.
This also corresponds to the saying “there are a thousand Hamlets in a thousand people’s hearts” – different practitioners can always find different ways of mix design by combining their own experience.
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At present, there is no relevant standard or specialized research in China on the calculation method of the effect of adding different amounts of water before the initial setting of ready mixed concrete on the compressive strength of concrete.
Reference materials include the relevant standard JGJ55-2011 “Code for Design of Ordinary Concrete Mix Proportion” and a few literature, but there are certain limitations and irrationality in their use.
To clarify the impact of post addition water on concrete performance, this article conducts a comprehensive analysis based on the calculation of a certain engineering case, in order to provide reference for the reasonable solution of related technical problems.
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Improving environmental quality, promoting green development, building a conservation oriented society, and promoting clean and civilized production are the themes of today’s social development.
The comprehensive utilization of resources and the construction of a circular economy are fundamental to the sustainable development of enterprises.
China’s construction projects cannot do without cement concrete, which is mainly made of cement, stones, and natural river sand.
Natural sand is a non renewable resource, and many places have taken measures to restrict or ban its use due to environmental protection.
With the increasing protection of the environment, the contradiction between using sand as a commodity concrete mixing plant for concrete production has become increasingly prominent.
The quality of natural sand has been declining year by year and is seriously in short supply.
The price of sand continues to rise, and during the peak period of concrete consumption, there is even no sand available, which affects the development of engineering construction.
Therefore, in response to environmental protection requirements and industry demands, it is necessary to explore a material that can replace or partially replace natural sand, which can not only save production costs but also use local materials to protect local environmental resources.
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Concrete, as the largest and most widely used building material in construction engineering, its quality directly affects the safety and durability of the structure.
The design of concrete mix proportion is the “soul” that determines its performance.
Although laboratories can design theoretically optimal mix proportions, in practical construction applications, theoretical mix proportions often require a series of verifications and adjustments due to factors such as fluctuations in raw materials, environmental changes, transportation conditions, and construction processes.
This article aims to explore the specific application of concrete mix proportions in the entire construction process, and analyze how to transform design blueprints into stable and high-quality engineering entities.
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In construction engineering, concrete cracking is the most common quality problem, and both ordinary concrete components and large volume concrete structures may experience varying degrees of cracking.
These types of cracks not only affect the appearance, but can also weaken the structural load-bearing capacity, durability, and waterproofing in severe cases, and even pose safety hazards.
In fact, the occurrence of concrete cracks is not accidental, but the result of multiple factors such as load, shrinkage, materials, and construction working together.
This article provides a concise analysis of the causes and operable treatment methods of cracks in ordinary concrete and large volume concrete, providing practical reference for engineering construction and later maintenance.
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