Hu Yongjie (Engineer at Tianjin Daxin Concrete Co.
, Ltd.
).
precast-tech
precast-tech
20 yuan processing fee! Start a new model of integration in the concrete industry!
A new type of concrete sales model has emerged in regions such as Anhui and Xi’an.
Previously, it involved directly acquiring mixing plants, often costing tens of millions or even hundreds of millions.
Such a large investment is undoubtedly a suicidal act in the current industry situation.
Therefore, the following new type of concrete sales method has emerged.
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Construction technology scheme for pavement concrete hardening engineering
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The method involves excavating with an excavator and leveling with manual assistance.
When digging road trenches, temporary drainage facilities must be taken to prevent water accumulation in the trenches and softening of the roadbed.
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Analysis of Key Quality Issues in Concrete Construction
In concrete construction, material differences, environmental fluctuations, and insufficient material adaptation can easily lead to rapid slump loss, poor aggregate gradation, high powder content (MB value) of machine-made sand, and incompatibility between polycarboxylate admixtures and cementitious materials, which directly affect the performance of concrete and lay quality hazards.
This article briefly explains the diseases, causes, and practical treatment methods of each problem, providing accurate guidance for on-site construction.
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Experimental comparison of workability, strength, and durability of high-quality machine-made sand concrete
By using advanced equipment and processes to control various indicators of machine-made sand within a good range, the quality of machine-made sand can be further improved.
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The close cooperation of the construction unit is the key to ensuring the quality of winter concrete
When pouring concrete for side walls and columns, the concrete should be layered, and the thickness of each layer should not exceed 400mm.
The concrete for beams and slabs should be poured simultaneously, starting from one end and advancing forward.
The area should be minimized as much as possible during concrete pouring.
Attention should be paid to compacting the bottom and sides of the beam, and the vibrator should not directly touch the steel bars or embedded parts.
The virtual laying thickness of the concrete slab should be slightly greater than the thickness of the slab.
After vibration, it should be smoothed with a wooden trowel and then covered with plastic film.
The insulation layer should be promptly laid on top of it.
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Winter construction challenge: How to make concrete “warm and grow” in severe cold?
Entering the harsh winter, many projects are facing the challenge of low temperatures.
Concrete, as the “flesh and blood” of architecture, particularly requires scientific care during winter construction.
Today, we will unveil the key points of winter concrete construction.
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Understand the value of load dynamic coefficient for reinforced concrete structures in one article
When a structure is subjected to dynamic loads (such as vibration, impact, earthquake), due to the fast speed of the load, the structure will generate inertial forces, resulting in internal forces, deformations, and other responses greater than the effect of static loads of the same magnitude.
The dynamic coefficient is a factor that amplifies the static load when converting the dynamic load value into an equivalent static load value for calculation.
It reflects the ratio of the response of the structure under dynamic action to the response under static action.
Article 5.
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1 of the Load Code for the Design of Building Structures GB50009-2012: For the dynamic calculation of building structure design, when there is sufficient basis, the self weight of heavy objects or equipment can be multiplied by the dynamic coefficient and designed according to the static calculation method.
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List of required concrete test blocks: Understand in one article which type to make, how many sets to make, and why to make (attached with a
Concrete test blocks are a key physical carrier and quantitative basis for controlling quality, verifying performance, and evaluating safety during the construction process.
Their standardized retention, curing, and inspection constitute a technical closed loop for quality control throughout the entire chain from raw materials, mixtures, to physical structures.
In order to eliminate misjudgments and risks caused by improper management of test blocks and ensure that various testing data can truly and reliably reflect the quality of engineering entities, the mandatory requirements and core principles in national standards are extracted and integrated, and this standardized implementation guide is formulated.
Through systematic diagrams and key points, this guide aims to provide a clear, accurate, and quickly accessible on-site operation basis for project technical, quality, and construction management personnel, so as to effectively transform the normative provisions into ensuring the safety and reliability of engineering structures.
Effective practice of durability.
The influence of various mineral admixtures on early shrinkage and drying shrinkage of C100 concrete
Core tip: The early shrinkage and drying shrinkage of concrete gradually decrease with the increase of fly ash content, and the inhibitory effect of fly ash on early shrinkage is better than that of drying shrinkage; With the increase of mineral powder content, the early shrinkage of concrete increases while the drying shrinkage decreases; The addition of silica fume increases the early shrinkage and drying shrinkage of concrete, and this effect becomes more pronounced with the increase of silica fume content.
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