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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Month: April 2026
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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A concrete retarding accident caused by improper dosage of admixtures
Concrete pouring for the five story structural beams, slabs, and columns of a construction site began at 4:00 pm on August 21, 2017, and was completed around 1:00 am on August 22.
At around 9:00 on August 22nd, construction workers reported that the last two trucks of concrete poured this time did not set, resulting in delayed setting.
Our company sent testing personnel to the site to inspect the situation.
Other parts have already passed final setting, while the setting part is the last pouring part of the five layer structural slab, which has a soft surface and can be clearly marked with footprints, indicating that the concrete has not yet set initially.
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Analysis of Key Points for Quality Supervision Station Inspection of Pre mixed Concrete Enterprises
The inspection of pre mixed concrete production enterprises by the quality supervision station is a systematic and comprehensive work, covering all aspects of the enterprise’s production and operation.
Its purpose is to urge enterprises to fulfill their main responsibility for quality, establish a sound quality management system, standardize production and operation behavior, and ensure the quality of ready mixed concrete from the source.
Pre mixed concrete production enterprises should attach great importance to the supervision and inspection of the quality supervision station, carefully carry out self-examination and self correction according to the inspection points, timely discover and rectify existing problems, and continuously improve the quality management level of the enterprise.
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The fundamental cause of cracks in cement concrete pavement
The pavement structure of field roads usually consists of a surface layer and a base layer.
For field roads in areas with good roadbed soil, stable hydrological conditions, and non freezing conditions, as long as the roadbed strength and stability meet the requirements, a cushion layer is generally not specifically set up.
The basic intention and requirements for the design of cement concrete pavement cushion layer:.
Case warning: Purchasing unqualified concrete, both buyers and sellers cannot escape their responsibilities
Currently, unqualified mixing plants are rampant.
Many construction companies are greedy for low prices and lack awareness of their harm, while legitimate concrete enterprises are squeezed out of the market and unable to tolerate their disturbance.
However, many construction companies are not aware that this behavior has crossed the legal red line – according to Article 62 of the “Regulations on Quality Management of Construction Projects” and related regulations, if the general contractor subcontracts the project to an unqualified unit, it constitutes illegal subcontracting and should be punished according to law.
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