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1 Concrete can be transported on-site using tools such as handcarts, buckets, chutes (foundations), pumps, etc.
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Concrete construction plan for a certain channel treatment project (2)
(The following diagram shows the construction sequence of the first level retaining wall.
When the construction of the first level shore top earthwork meets the requirements of the second level retaining wall construction, the construction of the second level retaining wall can be carried out in the same order as shown in the figure below.
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Detailed explanation of concrete structure entity strength identification and acceptance in one article
In practical engineering operations, many practitioners are always confused about the concept of concrete strength.
Take C30 concrete, which has the highest frequency of use, for example, you will find many completely different numbers.
The design drawings indicate 30MPa, while the test block obtained 35MPa through pressure testing.
However, the value used for structural calculations was 14MPa, and the strength value obtained from core sampling became 26MPa.
What kind of relationship are all these numbers? It’s really confusing.
I don’t need to use my brain in that line, I just have a handle on it.
This is the boldness and boldness of a true engineer.
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Classification and Characteristics of Soil Foundation for 158th Cement Concrete Pavement
Soil foundation is the fundamental load-bearing matrix of pavement structure, and it is also the core foundation that determines the uniform support effect of pavement.
Even if the surface layer and subgrade layer are perfect, once there are quality defects in the soil foundation (roadbed) itself, the long-term service life and performance of the pavement will lose its core guarantee.
As the second installment of a series of special topics, this issue introduces the engineering classification and core characteristics of roadbed soil, compaction quality control, treatment of special soils such as expansive soil and frost heave soil, and special measures for construction in humid soil conditions.
It provides technical references for interested road users.
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Century Architecture Daily: Summary of Price Fluctuations in Cement, Sand, and Concrete Nationwide on April 9th
On April 9th, the national cement market experienced a small-scale decline, with Longyan, Nanping, Shenzhen, Chongqing, and Changdu falling by 10-20 yuan/ton.
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How will the concrete business continue in 2026? Six departments have given three ways out
In 2026, it is not a low point for the concrete industry, but a life and death elimination race.
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Lessons learned from the bloody process of concrete production
A certain project involves the construction of an existing building starting from the 8th floor.
The concrete construction project involves shear walls with a strength grade of C40.
After demoulding, vertical cracks were found on the wall surface, which were very regular.
There were vertical cracks every 1.
5m to 1.
8m, with sharp ends and a wide middle.
The widest part was about 0.
2mm to 0.
3mm, and some cracks were through cracks.
The concrete strength meets the design requirements and even meets the requirements of C45.
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The influence of dust content in coarse and fine aggregates on the dosage of concrete admixtures
The traditional method for determining the specific dosage of admixtures is usually based on the recommended lower limit of the commonly used dosage by the water reducing agent production plant, taking a certain dosage as the benchmark dosage, and then fluctuating up and down on the basis of the benchmark dosage.
Several concrete specimens with different dosages of admixtures are compared, and the optimal dosage is determined based on the test results.
Generally, for low strength series concrete, the dosage of water reducing agent increases by about 0.
1% for each grade increase, while for high-strength series concrete, the dosage of water reducing agent increases by about 0.
2% for each grade increase.
The method of adding this type of water reducing agent is relatively crude, simply relying on empirical operation without systematic calculation.
Therefore, it is easy to cause improper use of concrete water reducing agents, which can lead to difficult control of concrete slump, poor cohesion, easy bleeding, and pipe blockage during transportation.
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Exploration on the accuracy improvement of strength testing using self compacting concrete core drilling method
In view of this, this article aims to sort out the influencing factors of the strength testing accuracy of self compacting concrete core drilling method, and verify the effectiveness of the proposed measures through experiments, in order to provide feasible technical paths and data support for systematically improving the compressive strength testing accuracy of self compacting concrete core drilling method.
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Analysis of the key points of appearance quality of precast concrete T-beams and research on improvement measures
With the acceleration of urbanization, precast concrete structures have been widely used in construction engineering.
Precast concrete T-beams, as a structural component, have the advantages of high strength, ease of construction, and economy, and are increasingly favored in the field of architecture.
However, the appearance quality of precast concrete T-beams has become an important factor affecting their engineering quality and service life.
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