The methods for reducing concrete shrinkage mainly include shrinkage reducing agent method, expansion agent method, and internal curing method, each of which has its own advantages and disadvantages.
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precast-tech
precast-tech
2.1.2 Composition and Technical Requirements of Concrete -2.3.2 Performance and Application of Other Materials
Concrete is an artificial stone material with certain strength, which is made by mixing and blending cementitious materials, water, coarse aggregates, fine aggregates, and additives with specific properties in appropriate proportions, and then hardening for a certain period of time.
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Exploration into the Influence of Coarse Aggregate Quality on Concrete Performance
The construction project of Songshan Lake Hospital affiliated to Guangdong Medical College started on September 3, 2018 and completed its main structure topping out on September 30, 2020.
It was fully completed and accepted on January 12, 2021.
The main project of the hospital includes a basement and 15 floors, with a total construction area of 420000 square meters.
In the construction of the basement and standard floor beams and slabs, a large amount of concrete materials are used.
In order to ensure the final construction quality and pouring effect, appropriate testing methods must be adopted in accordance with the corresponding testing specifications to comprehensively test the various indicators and properties of coarse aggregates in the concrete, ensuring that they will not have adverse effects on the performance of the concrete.
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Research on Common Problems and Solutions in Concrete Mortar Engineering
Concrete mortar is an important material in construction engineering, and its quality directly affects the stability, durability, and service life of building structures.
At present, common mortar quality problems in engineering, such as cracking, peeling, and insufficient strength, have a negative impact on construction efficiency and structural reliability.
Although scholars at home and abroad have conducted relevant research on materials, construction, and management, there is a lack of systematic analysis of actual on-site problems, which urgently needs improvement.
Therefore, this article combines research and experiments to deeply explore the causes of mortar quality problems from the aspects of material selection, mix design, construction technology, and maintenance measures.
Scientific and efficient solutions are proposed to provide reference for improving mortar performance and optimizing industry technology, and to promote the sustainable development of the construction industry.
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Management System for Disposal of Unqualified Concrete and Residual Concrete
Article 1: In order to reduce the company’s product scrap rate, minimize losses, and save costs, this system is specially formulated.
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Why are air holes prone to occur on the surface of concrete during aluminum formwork construction
During the molding process of concrete, various factors such as materials, processes, and environmental conditions often lead to the formation of bubbles on the surface of the concrete.
A small amount of bubbles will not have a significant impact on components or buildings, but too many bubbles will bring a series of problems.
(When the air content of concrete increases by 1%, the compressive strength at 28 days decreases by 5%.
– Taken from Baidu Scholar).
The latest national standard for concrete! Strength reaches C200!
According to the clear provisions of the national standard “Ultra High Performance Concrete”, the mechanical performance classification criteria for Ultra High Performance Concrete (UHPC) are as follows: its compressive strength is divided into six grades, UC100 to UC200, based on its performance; Meanwhile, the tensile strength is divided into six grades, UT5 to UT13.
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Why does concrete produce hard shell phenomenon
The phenomenon of hard shell in concrete is mainly due to the rapid evaporation of surface moisture, combined with the influence of admixture components and construction operations, resulting in surface hardening while the interior has not yet set.
I have sorted out the specific reasons and solutions for you:.