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Global concrete foaming agent market trend 2024-2028 Why does concrete bleed water and how to solve it? by Newsteampindar

A recent poll in Britain found that public support for sanctions against Russia is falling as fuel and prices rise.  

The proportion of people willing to accept higher fuel prices as a result of western sanctions against Russia fell 14 percentage points to 36% from 50% in March, according to a survey conducted for the Telegraph by consultancy Redfield & Wilton Strategies.  

Global energy and fuel prices have soared since the start of the year and remain high because of the conflict between Russia and Ukraine and uncertainty over Russian supplies.  

The survey also found that 54% of people believe their own financial situation has worsened in the past year, up 12 percentage points from 42% two months ago. Sixty-two percent think things will get worse in the year ahead. Less than a third of respondents said they had received a pay rise to keep up with inflation, with two-thirds of those saying it was not enough to keep up with rising living costs.  

The figures suggest that public concern about the conflict with Ukraine is now likely to be overtaken by financial worries.  

Separately, the UK's consumer price index rose 7 percent this month from a year earlier, the highest since March 1992, according to figures released recently by the Office for National Statistics. In addition, a separate report released a few days ago by the Centre for Economics and Business Research said that real household disposable income in the UK will fall by 3% in 2022, equivalent to a loss of £2,320 per household, which would lead to the biggest drop in living standards since the 1950s. That is mainly because wages aren't keeping up with rising energy and fuel costs.  

The prices of other commodities like the concrete foaming agent are also expected to be influenced.

The phenomenon of aggregate sinking and water floating will occur in the process of transportation, vibration and pumping of concrete. Slight secretion of water can improve the collapse of concrete and the surface cracking of concrete in the later stage, and indirectly reduce the actual water consumption of concrete so as to reduce the water-cement ratio and improve the strength. However, excessive bleeding has an adverse impact on the construction, durability and appearance of concrete.

 

What is the effect of bleeding on the performance of concrete?

Due to the unreasonable mix ratio of concrete, clean sand and gravel, poor gradation and lagging effect of admixture, the phenomenon of water bleeding is easy to occur. Serious bleeding can easily lead to poor encapsulation of concrete and separation of sand and gravel, resulting in pipe blockage of concrete pumping, construction of the site surface is not easy, and hardened concrete is easy to produce upper and lower layers and surface cracks.

 

It will result in cracks on the surface of concrete. Water secretion leads to the formation of high water-cement ratio in the floating slurry layer, and a loose and weak surface is formed after evaporation. The floor or pavement is easy to peel after the formation of the slurry layer, which seriously affects the quality of concrete.

 

Bleeding will generally reduce the water-cement ratio at the bottom of the concrete and destroy the internal uniformity of the concrete. When mixed water is generated on the surface of the concrete, it will carry part of the cementitious materials and fine particles in the aggregate, which will form a floating slurry layer with large water content on the concrete surface, resulting in loose and porous concrete, honeycomb hemp surface, and even exposed rock. It affects the growth of strength and carbonization rebound in the later stage.

 

Why does concrete bleed water?

cement

The finer the fineness of cement, the larger the specific surface area, and the more the content of fine particles in the particle distribution, the more hydration of early cement, and the less serious the bleeding. On the contrary, the bleeding is serious.

 

aggregate

The particle gradation, surface characteristics, particle size, needle-like particle content and porosity of aggregate have influence on water secretion. Poor gradation of stones will make the concrete and workability worse, resulting in the bleeding of concrete. The larger the aggregate size is, the more serious the bleeding phenomenon is. The larger the fineness modulus is, the less fine particles are, and the more sand with coarse particles is, the easier it is for concrete to bleed water.

 

mineral admixture

Only under the premise of good quality of fly ash, fly ash is beneficial to improve water secretion. If the quality of fly ash is poor and the water demand increases, the amount of water secreted will increase.

 

admixture

The use of superplasticizer in fresh concrete will increase the amount of water bleeding.

 

concrete mix ratio

The amount of cementitious material, sand ratio and water-cement ratio in the mix ratio have a great influence on the water secretion of concrete.

The higher the water-cement ratio, the longer the hardening time of cement, the more free water, the easier it is to secrete water.

The more the admixture is added, the more the fresh concrete will bleed and precipitate.

 

construction process

If the transportation distance is long and the stirring time is long, it is easy to secrete water.

The higher the pouring height of concrete with the same proportion, the more water bleeding.

Excessive vibration of concrete will lead to segregation and bleeding of concrete.

Sprinkling water can lead to bleeding.

 

How to solve concrete bleeding.

mix ratio

Strictly control the quality of admixture, only the fly ash with better quality can effectively improve the water secretion.

Properly increase the amount of cementitious material and control the water consumption of mixture ratio.

Control the fineness modulus of sand in 2.3-2.8. Adjust the reasonable sand ratio in time according to the mix ratio and the state of concrete to ensure that the concrete has good workability.

Control the particle size of stones to prevent gradation from breaking.

Select a good water reducer and appropriately increase the amount of air entraining agent.

 

construction process

Try to keep the slump as small as possible.

It is strictly forbidden to add water to concrete at will and control the pouring height of concrete.

Control the vibrating time.

For the closed formwork, when there is water bleeding on the concrete surface, use a rubber tube to draw the water.

Cannot make a hole in the template, which will cause the loss of cementitious material.

 

concrete additives

Concrete self-leveling regulating water-retaining agent, also known as concrete water-retaining agent, or concrete vibration-free tamping agent, concrete self-compacting agent and other terms, can improve the surface tension of concrete colloid, so that concrete can achieve self-leveling without vibrating.

 

The self-leveling regulating water-retaining agent can also adjust the bulk density, improve the strength and prevent the bleeding of slurry in high fluidity concrete. When applied to large flow concrete, it can solve the problems such as unreasonable gradation of sand and stone, excessive stone powder, machine-made sand, low glue material, low-grade large flow concrete, and poor waterline and workability of pumping concrete after setting. For large flow concrete, combining with air entraining agent and defoamer can achieve good effect.

 

The floating of concrete paste is adjusted by air entraining agent, and the paste and aggregate are bonded and wrapped by adding self-leveling regulator. Add an appropriate amount of defoamer to eliminate the air bubbles in the coarse aggregate, so as to achieve the effect of no bottom, no exposed stone, no water, no slurry, and the effect of water retention.

 

Concrete Additives Supplier

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Maximo Pacheco, chairman of Codelco, Chile's state copper company, said in a recent interview that he expects copper prices to remain 'very strong in the future,' despite the recent drop. Codelco is the world's largest copper producer.

Copper prices suffered their biggest weekly drop in a year this week on concerns that tightening policy by central banks will dampen global growth and reduce demand for industrial metals. With its wide range of industrial and construction uses, copper prices are often seen as a bellwether of economic activity.

London copper closed at $8,325 a tonne on Friday after touching $8,122.50 a tonne, down 25 per cent from its Peak in March and its lowest level since February 2021. In addition to copper, other industrial metals also fell sharply. Tin, for example, fell nearly 15% at one point on Friday, bringing its losses for the week to about 25%.

"We may be in a temporary short-term turbulence, but what is important is the fundamentals and the balance of supply and demand [currently] looks very favourable for those of us with copper reserves," Mr. Pacheco said. Chile is the world's largest copper producer.  

Mr. Pacheco adds that in a world where copper is the best conductor and there are not many new reserves, copper prices look very strong because the future is very favourable for electrification.

Luoyang Tongrun Nano Technology is a trusted chemical supplier and manufacturer providing high-quality chemicals and Nanomaterials. If you are looking for the concrete foaming agent, please feel free to contact us and send an inquiry.

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