Concrete anti-segregation agent manufacturer-Causes and treatment methods of segregation occurring during concrete pouring

Contents of this article

• Concrete segregation problems and treatment methods?

• What should I do if the concrete segregates? What causes it and how to solve it?

• What are the causes and prevention measures of concrete segregation?

• What are the causes and solutions for segregation during concrete pouring?

• What causes concrete segregation?

• Is there segregation at the bottom of the cast-in-place pile?

• How to judge the segregation of concrete mixture? What are the causes and prevention measures of segregation?

Concrete segregation problems and treatment methods?

The main cause of concrete segregation problem is that it is stopped for too long without stirring, or the water-cement ratio is too high. Treatment method Generally speaking, the first phenomenon requires timely stirring and slump test. Normal construction can only begin after the slump test is suitable. If the water-cement ratio is too large, it is necessary to adjust the water consumption in time. It is best to have a tool or meter to measure the water volume.

What should I do if the concrete segregates? What causes it and how to solve it?

Causes for segregation during concrete pouring: Improper pouring and vibration, the maximum particle size of the aggregate is too large, the proportion of coarse aggregate is too high, the content of cementitious materials and fine aggregate is low, The density of coarse aggregate is too high compared with fine aggregate, or the mixture is too dry or too thin, etc. The tendency to segregation can be reduced by using mineral admixtures or air-entraining agents. Methods to deal with segregation during concrete pouring:

1. The problem of concrete segregation caused by the problem of aggregate moisture content should be solved by extending the mixing time. Increasing the dosage of admixtures such as fly ash is also very effective in controlling this type of segregation phenomenon.

2. During the construction process, we must strictly control the quality and resolutely prevent unqualified materials from entering the construction site to ensure the stability of the quality of the aggregate;

3. If the water content in the sand is In the saturated state (≥10%), the method of extending the mixing time is used to solve or increase the amount of admixtures such as fly ash to control the segregation problem of commercial concrete.

4. Increase the sand rate to adjust the concrete mix ratio and solve the segregation problem. Extended information: The hazards of concrete segregation: 1. It affects the pumping construction performance of concrete, causing sticky tanks, blocked pipes, affecting the construction period, etc., and reducing economic benefits. 2. It affects the appearance of the concrete structure, with sand patterns, exposed aggregates, and exposed steel bars appearing on the surface of the concrete. 3. The strength of concrete will be greatly reduced, which will seriously affect the bearing capacity of the concrete structure and destroy the safety performance of the structure. In severe cases, it will cause rework and huge economic losses. The poor homogeneity of concrete results in inconsistent shrinkage of various parts of the concrete and is prone to shrinkage cracks in the concrete. Especially when constructing concrete floor slabs, due to concrete segregation, the surface cement slurry layer thickens, shrinkage increases sharply, and serious cracks occur. It greatly reduces the durability properties of concrete such as concrete impermeability and frost resistance.

What are the causes and prevention measures of concrete segregation?

The reasons are:

(1) Unqualified aggregate gradation causes concrete to separate from the slab.

(2) The free falling height of concrete is large and no deceleration device is provided.

(3) Over-vibration during pouring.

Prevention and control measures:

(1) Use graded and qualified aggregates.

(2) When the free falling height of concrete exceeds 2m, facilities such as cascades, chutes or vibrating chutes should be installed, and the stacking height of concrete under the discharge port of the cascades shall not exceed 1m, and the falling height shall exceed 1m. 2m, a deceleration device should be installed.

What are the causes and solutions for segregation during concrete pouring?

Where should the segregation of concrete be divided? The segregation caused during transportation may be due to the failure of your transportation machinery. Generally, this phenomenon will not occur if you use a concrete transport truck (called a snail truck in Guangdong). Segregation on the warehouse surface is not easy to deal with. Especially on the side of the formwork, the accumulation of coarse aggregate can easily produce honeycomb pits. If there is too much slurry, it is easy to produce concrete that is caused by segregation of the slurry after pouring. For honeycombs and pockmarks, cut out the honeycombs and pockmarks and plaster the surface with glue mixed with cement mortar and it will be OK

What is the reason for concrete segregation?

1. Segregation caused by poor concrete quality

Concrete is the most important component of concrete. The quality of concrete directly determines the characteristics of concrete. In addition, segregation is also closely related to concrete.

2. Stones cause segregation

If the mud content in sand and gravel is too high, it will also make the performance of concrete worse, and eventually cause concrete segregation.

3. Using the wrong type of water-reducing agent or using the wrong amount can also cause segregation problems in concrete. The use of water-reducing agent must be based on the specific situation, and the demand for water-reducing agent cannot be increased or reduced casually.

Is there segregation at the bottom of the cast-in-place pile?

Causes for segregation during concrete pouring:

Improper pouring and vibration, the maximum particle size of the aggregate is too large, the proportion of coarse aggregate is too high, the cementitious material and fine The content of aggregates is low, the density of fine aggregates is too high compared to coarse aggregates, or the mixture is too dry or too thin, etc. The tendency to segregation can be reduced by using mineral admixtures or air-entraining agents.

Measures to deal with segregation during concrete pouring:

1. The problem of concrete segregation caused by the problem of aggregate moisture content should be solved by extending the mixing time. Improve the control over the dosage of fly ash and other admixturesIt is also very effective to control this kind of segregation phenomenon.

2. During the construction process, we must strictly control the quality and resolutely prevent unqualified materials from entering the construction site to ensure the stability of the quality of the aggregate;

3. If the water content in the sand is In the saturated state (≥10%), the method of extending the mixing time is used to solve or increase the amount of admixtures such as fly ash to control the segregation problem of commercial concrete.

4. Increase the sand rate to adjust the concrete mix ratio and solve the segregation problem.

How to judge the segregation of concrete mixture? What are the causes and prevention measures of segregation?

The causes and prevention measures of concrete segregation are

1. Causes:

(1) Unqualified aggregate gradation causes concrete to separate from the slab.

(2) The free falling height of concrete is large and no deceleration device is provided.

(3) Over-vibration during pouring.

2. Prevention and control measures:

(1) Use graded and qualified aggregates.

(2) When the free falling height of concrete exceeds 2m, facilities such as cascades, chutes or vibrating chutes should be installed, and the stacking height of concrete under the discharge port of the cascades shall not exceed 1m, and the falling height shall exceed 1m. 2m, a deceleration device should be installed.

(3) When vibrating, the concrete should stop sinking, bubbles will no longer appear, and the surface will appear flat and slurry. No over-vibration is allowed.