Stairs, balconies, and load-bearing walls all rely on concrete.
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precast-tech
precast-tech
The key differences and roles between concrete standard curing and the same conditions
Concrete standard curing test blocks and curing test blocks under the same conditions are the core of strength testing and necessary inspection items for acceptance.
Many people may be confused: what is the difference between the two? What are their respective roles? Below is a clear comparison table for easy reference and mastery!.
Preparation and Performance Study of C120 Micro Expansion Ultra High Performance Concrete UHPC
The research and development of micro expansion UHPC is expected to solve the above-mentioned problems of UHPC under normal temperature curing conditions.
There is limited research on micro expansion UHPC in existing literature.
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To control the quality of concrete well, attention must be paid to the control of each link
Concrete is a relatively special commodity with strong timeliness, which also limits its service radius.
Concrete sales are the source of quality control for concrete companies.
When signing a sales contract, in addition to specifying quality acceptance clauses such as unit price, quantity, payment method, engineering characteristics, and whether there are special quality requirements, it is also necessary to specify in detail the sampling method and curing system of the specimens, the operating procedures for concrete pouring, the curing method and curing period of the entity, etc.
Due to the limitation of the length of the concrete sales contract, the provisions of many quality terms are not very detailed, but it should be noted that the construction technology disclosure and maintenance plan requirements provided by the technical department of the concrete company (after being signed and confirmed by the construction technicians) have the same legal effect as this contract.
In addition, when encountering special requirements or special engineering parts, timely communication should be made with the technical department to fully assess quality risks.
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Implementation Manual for Excellent Projects of Chuanglu Ban Award – Concrete Engineering Training PPT Lectures, Page 68
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Under the wave of multifunctionality, the chaos and standardization of concrete admixtures
Undoubtedly, admixtures have become a core component of concrete, and the iterative upgrading of their technology is a key driving force for the overall development of concrete technology.
In recent years, the additive industry has developed rapidly, and the product system has already broken through the traditional category boundaries, presenting a pattern of rich varieties and significant performance differentiation.
Although the “Terminology for Admixtures” GB/T 8015-2017 has expanded the categories and definitions of admixtures, it is still difficult to keep up with the pace of market development and technological innovation.
Special admixtures such as reducing agents, enhancing agents, mortar, precast concrete, permeable concrete, and plant-based concrete are emerging one after another, accompanied by confusion in category naming and market chaos.
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What size of concrete crack is a crack? How do concrete cracks appear?
In general, the size of cracks is measured based on their width.
According to relevant standards and engineering practices such as the “Code for Design of Concrete Structures” (GB 50010), cracks can usually be classified into the following categories:.
[Personal Opinion] Regarding the issue of compensating for the shrinkage range of concrete using the expansion strengthening strip method
In order to eliminate problems such as shrinkage and cracking of concrete during the solidification process, ultra long structures are generally equipped with expansion and contraction pouring strips.
However, seamless construction is adopted during the construction process for the convenience of construction or to meet the requirements of the project schedule.
The method of using expansion reinforcement tape is the most commonly adopted method for seamless construction.
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Technical leader must know the plan, formwork for the construction plan of plain concrete
The difficulty in the construction of this project is the wind tunnel body engineering.
In order to achieve the finishing effect of plain concrete on the surface of the tunnel body, the bottom plate, side walls, and top plate of the wind tunnel need to be constructed by cast-in-place plain concrete.
The quality control level of fair faced concrete should not be lower than the requirements of “decorative fair faced concrete” in the “Technical Specification for Application of Fair faced Concrete” (JGJ169-2009).
Appearance quality requirements for plain concrete: no exposed reinforcement, honeycomb, voids, slag inclusion, or looseness are allowed; Uniform and smooth color; No rough surface, peeling or sanding, contamination, bubble diameter not exceeding 1mm; no repair marks, no flow or erosion marks.
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