Precast News From China
For general components, the number of measurement areas should not be less than 10.
When the number of inspected components is greater than 30 and there is no need to provide estimated strength for a single component, or when the dimensions of the inspected components in one direction are less than 4.
5m and the dimensions in the other direction are less than 0.
3m, the number of measurement areas may be appropriately reduced, but not less than 5,.
Port and waterway engineering concrete is different from general engineering concrete due to its exposure to seawater or freshwater environments, as well as the effects of waves, sea currents, tides, etc.
It has multiple characteristics and requirements:.
The bridges and buildings you pass by every day may be quietly changing, and the small cracks hidden in the corners of the walls and gaps on the bridge deck may seem insignificant, but there are safety hazards everywhere.
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This product is a water-soluble polymer specially developed for polycarboxylate superplasticizer mother liquor.
By relying on its unique mode of action in concrete, the viscosity of the concrete mixture achieves a good balance between fluidity, permeability, and resistance to segregation.
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How to improve the crack resistance, impact resistance, and durability of concrete engineering has always been an important issue in the construction industry.
Steel fiber, as an innovative reinforcement material, has become one of the core additives in modern concrete due to its excellent performance, and is widely used in various construction projects.
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In the future, concrete enterprises need to attach great importance to the guarantee of raw materials, actively expand new paths such as solid waste resource utilization and low-carbon production.
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The research on cement fineness has been ongoing since the production of cement, and has been continuously deepened based on the understanding of the properties of cement concrete.
Recently, I heard a new term on a concrete forum called “Grinding Universal Theory”.
Its main viewpoint is that materials such as cement and admixtures need to be ground, and the fineness of cementitious materials is too fine, which causes cracking in concrete.
No matter what material is ground in concrete, it can be used.
Whether the viewpoint is correct or not, it has aroused a lot of curiosity, as if the fineness of cement can be freely controlled.
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The male dormitory building of a certain school has a building area of 6600m2 and a frame structure.
The design strength grade of beam and slab concrete is C25, using commercial concrete.
Construction was carried out from March 13, 2010 to August 28, 2010, and the concrete was cured by watering after pouring.
After demoulding, it was found that there were multiple point like bursts on the concrete surface of the beam and slab components, and the number of burst points increased with the age of the concrete.
To ensure the safe use of the building, the construction party commissioned an appraisal agency to conduct testing and appraisal on the concrete of the project, and analyze the cause of concrete cracking.
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Due to strong winds and dry weather, the surface moisture of concrete evaporates quickly.
As a result, the shrinkage of concrete increases, and the probability and penetration depth of concrete shrinkage cracks increase.
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With the widespread application of concrete admixtures in concrete, they have become an indispensable component in addition to cementitious materials, sand, stone, and water.
The characteristics of concrete admixtures are a wide variety and small dosage, which play an important role in improving the performance of newly mixed and hardened concrete.
The correct selection and use of admixtures is a key link in modern concrete production and quality control, as well as a prerequisite for ensuring the quality of concrete structural engineering.
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