lignosulphonate influenced in concrete
The concrete is mainly made up of certain materials such as cement, sand, stone, water and additives.
And mixed. The proportion of water in it is especially important. In the process of mixing, water helps
Better blending of raw materials, but too much water will cause the concrete to be thinner. After condensing
The concrete is prone to cracks, the strength is low, and the internal clearance of the concrete is too large, and the water permeability is greatly reduced.
Low. In the 1930s, a new type of admixture began to emerge. Through this addition
The amount of cement used in the concrete and the specific gravity of the water can be effectively reduced. At the same time,
Significantly increase the strength and durability of concrete.
1 Analysis of water reducing agent characteristics
This admixture, known as a water reducer, can also be called a plasticizer. The beginning of the water reducing agent
It was used in the United States in 1935 and in the 1950s. However, the water reducing agent is in China.
Later in development, the research on water reducing agents in the 1950s just started, and by the end of the 20th century, water reduction
The technology of the agent has achieved rapid development. There are also many types of water reducing agents, and there are lignins.
Acid salt water reducing agent, milk sulfonate water reducing agent, melamine water reducing agent, melamine water reducing agent, fat
Acidic water reducing agent, etc. According to the different water reducing energy of the water reducing agent, it can be divided into ordinary water reducing agent,
Superplasticizer and high performance water reducer.
The principle of action of the water reducing agent is as follows: because the cement particles will pass through the concrete mixing process.
The intermolecular interactions condense into a flocculent shape, and the water molecules are wrapped on the outside.
Cement can not be mixed thoroughly and evenly. After using the water reducing agent, because of the water reducing agent
With special discrete properties, the surface of the cement particles carries a negative charge. Through the charge
The mutual repulsion makes the cement particles uniformly dispersed. Mixed with water, sand, etc.
When they are together, the cement particles are allowed to flow sufficiently. At the same time, the water reducing agent also has a lubricating effect, so that
The surface of the cement particles becomes smooth and the resistance becomes small, thereby accelerating the mutual flow of the cement particles.
In addition to increasing the fluidity of the cement particles, the water reducing agent can also increase the workability of the concrete.
The workability will decrease slightly within a certain proportion of the water reducer, but once the ratio of the water reducer
In the case of more than 0.5-0.7%, the workability will be greatly improved, and the slump of the concrete will also follow.
The improvement of workability is reduced, and the quality of concrete is improved.
When the concrete is condensed, the use of the water reducing agent also causes a different condensation process. by
A large amount of experimental and engineering experience has found that appropriate water reducing agents are also used for accelerating concrete.
Have a certain contribution. Because the water reducing agent can reduce the water content in the concrete, the condensation of the concrete
The junction time is greatly shortened