What is the function of concrete anti-segregation agent?

Contents of this article

• The best formula for concrete anti-segregation agent?

• Idioms about the homophone (li)?

• Are diesel anticoagulants useful?

• What are the advantages and disadvantages of decantation separation?

• What is the principle of decanter?

• What does analysis do?

What is the best formula for concrete anti-segregation agent?

Concrete, as the largest building material, has developed rapidly. In recent years, high-strength and high-performance concrete has been widely used in engineering. The fluidity of concrete has developed from the previous 70~90mm to the current slump of 180~230mm. Some projects also use self-compacting concrete, and the pumping height is getting higher and higher. However, the fluidity and cohesion of concrete are often incompatible, that is, it is difficult for concrete to maintain high cohesion properties under large flow conditions. In this way, concrete that pursues high fluidity is prone to bleeding and segregation. Moreover, with the gradual depletion of river sand resources and mineral resources in my country, the gradation and fineness of river sand fluctuate greatly, ordinary manufactured sand with poor particle size is used on a large scale, the water retention of cement fluctuates, and high water reduction but The more sensitive polycarboxylic acid-type water-reducing admixtures are constantly being promoted, and the quality control of ready-mixed concrete is facing increasingly severe challenges. The existing concrete anti-segregation agents have a strong flocculation effect, which will cause the concrete to settle quickly and the concrete to lose its flow properties instantly, which is detrimental to the workability of concrete. For this reason, we propose an anti-segregation agent for concrete and its preparation method.

Technical implementation elements:

The purpose of the present invention is to provide an anti-segregation agent for concrete and a preparation method thereof to solve the existing concrete anti-segregation problems proposed in the above background technology. The strong flocculation effect of the agent will cause the concrete to settle quickly, causing the concrete to lose its flow properties instantly, which is detrimental to the workability of the concrete.

In order to achieve the above object, the present invention provides the following technical solution: an anti-segregation agent for concrete, the composition of the anti-segregation agent for concrete is as follows:

Fly ash 5- 15 parts, mineral powder 5-15 parts, steel fiber 1-2 parts, polyethylene glycol 1-2 parts, polyhydroxy acid water reducing agent 20-30 parts, tackifier 0.8-1.2 parts, coagulant 0.5- 0.9 parts, 200-300 parts of deionized water, several parts of liquid alkali, 5-10 parts of silicone monomer, 3-5 parts of oxidizing agent, and 1-3 parts of reducing agent.

Preferably, the organosilicon monomer is propyltrichlorosilane or vinyltrichlorosilane or fluorosilicone monomer or a mixture of the three.

Preferably, the coagulant is powdered sodium sulfate.

Preferably, the tackifier is PAM, and the PAM is moistened with methanol or ethanol, deionized water is added for stirring, and the mixture is heated to 55 degrees Celsius during stirring to prepare a solution with a concentration of 4%.

Preferably, the oxidizing agent is one or a mixture of hydrogen peroxide, ammonium persulfate, and potassium persulfate.

Preferably, the reducing agent is ammonium persulfate-anhydrous sodium bisulfite or ammonium persulfate-sodium hypophosphite.

Preferably, the alkali solution is sodium hydroxide.

Preferably, the preparation method of the concrete anti-segregation agent includes the following steps:

S1: Mixing: combine silicone monomer, deionized water, polyhydroxyacid water-reducing agent and polyethylene glycol are added into the reaction kettle for mixing;

S2: Oxidation: Stir until the mixture in step S1 is evenly mixed, and add oxidant for oxidation;

S3: Reduction: Add fly ash, mineral powder and steel fiber to the oxidized mixture in step S2, and then add the reducing agent;

S4: Neutralization: Add a tackifier to the reduced mixture in step S3 and coagulant, stir continuously until the mixture is uniform, and then add liquid caustic soda to adjust the pH so that the pH is between 7-9, and then the anti-segregation agent for concrete can be obtained.

Compared with the existing technology, the beneficial effects of the present invention are: the invention adds fly ash, mineral powder and steel fiber to the anti-segregation agent, which can not only improve the compressive strength of concrete, but also It can also effectively improve the working performance and stratification of concrete, improve the segregation resistance of concrete, and reduce the expansion and slump of concrete. PAM is used as a tackifier because PAM has more -NH2. The tackifier has good hydrophilicity, making the concrete hydrophilic, water-retaining, thickening, resistance-reducing and viscosity-increasing. Adding calcium sulfate as a setting accelerator can promote concrete water splashing, accelerate hardening, and promote condensation. The invention has wide sources of raw materials, low cost, green and environmental protection, and simple operation.

Idioms about the homophone (li)?

The pain of separation is a Buddhist saying that refers to the pain of separation from a loved one. The saddle never leaves the horse, and the armor never leaves the body. Armor: Armor is the protective clothing worn by the ancients when fighting. The horse does not take off its saddle, and the man does not take off his armor. On high alert. Keeping your fingers together is very close to the actual situation. Mottled and Luli mottled: the colors are messy; Luli: uneven. The description is colorful. Sadness, joy, separation, gathering. Generally refers to various situations experienced in life and various moods resulting from them. To leave one's hometown and go to another place. Bili Chili falls on the ninth day of the ninth lunar month. Diseased bones are fragmented: incomplete, leading to a haggard, weak and emaciated appearance. Describes the disease in which the body is thin and bones are exposed, and the body is weak and weak. Bujibuli means: approach, approach; Li: distance, leave. Refers to being neither close nor distant from a person. It mostly refers to the relationship between people who are close but not close, or distant but not distant. Haunted, confused and confused: also known as: "happy situation", a frustrated look. Blurred: vague. Refers to being at a loss as if lost.The look is unclear. The scale is not separated from the weight, which means that things are connected. It is also described that the two have a close relationship and often never leave. Lips and cheeks are close to each other, which means they are close and often stay together. Not far away from each other: to describe a very close distance. It originally means that the husband and wife are in harmony and never leave each other. Now it generally means that two people have a good relationship and are always together. Dang analysis and separation. Dang analysis: discrete. The family is separated and has no settlement. Dianpei wandering: falling down, metaphorical poverty, frustration; wandering: wandering. Dispersed due to famine or war. Describes a hard life and wandering around. Try to get the tiger to leave the mountain. It is a metaphor for using a trick to make the other party leave their original place in order to take advantage of the opportunity. To fall apart: to collapse; to fall apart: to separate. Collapse and disintegrate, fall apart. Describes the disintegration of a country or group. Separated flesh and blood: refers to relatives such as parents, brothers, children, etc. It is a metaphor for relatives being separated and unable to reunite. It’s hard to leave homeland: the place of birth, or the place where you lived in the past, here refers to hometown and motherland. It is difficult to leave the land of my hometown. Describes the infinite attachment to one's hometown or motherland... Bizarre and strange: the brightness is strange; Luli: the opening is uneven. Describes strange and colorful shapes.

Is diesel anticoagulant useful?

Useful.

Diesel pour point depressant, also known as diesel low-temperature flow improver, is a fuel additive commonly used in diesel production at home and abroad.

It has obvious effects on improving the diesel-gasoline ratio, increasing diesel production, saving kerosene, improving refinery production flexibility and economic benefits, and improving the low-temperature flow performance of diesel. Therefore, both domestic and foreign countries attach great importance to efficient and cheap diesel fuel. Research and product development of diesel pour point depressants. It has an obvious effect on increasing diesel production in refineries, improving production flexibility and diesel-gasoline ratio, and improving economic benefits. For the storage, transportation and users of diesel fuel, the application of pour point depressants can significantly improve its low-temperature performance. The addition of pour point depressant can change the crystal form of wax or the size of wax crystals, but it cannot prevent the precipitation of wax crystals and reduce the amount of wax precipitation. Therefore, under the action of the pour point depressant, when the diesel temperature drops to close to the cold filtering point, a large number of fine wax crystal particles will appear in the diesel, making the oil appearance turbid, but this does not affect the smooth flow of the diesel. Filter

What are the advantages and disadvantages of decantation separation?

Decanting separation: Separating denser and insoluble solids from liquids Separating sand and water Filtration: Separating insoluble solids from liquids Purifying drinking water Dissolution and filtration: Separating two solids, one It is soluble in one solvent and insoluble in the other to separate salt and sand.

Decanting generally separates solids and liquids by slowly depositing dense solids to the bottom of the mixture through gravity. However, when the density difference between the two phases is not large or the solid deposition rate is slow, a centrifuge can be used to accelerate the deposition. Decantation can also be used to separate two immiscible liquids, however it is not as effective as using a separatory funnel.

What is the principle of decanter?

The decanter is also called a decanter. Its principle is:

The decanter stops at the high water level in the pool before a cycle as the starting point.

When drainage is required, the control component gives a signal to instruct the power device to work. The push rod extends forward evenly and moves according to the required trajectory, so that the water collecting tank of the decanter moves down at the designed speed, completing the Decant the water evenly.

When the decanted water reaches the low point of the water level, the downward limit switch of the push rod gives a signal, the motor reverses, and the traction water tank moves upward, returning to the preset position, waiting for the completion of the next cycle.

What does analysis do?

First "from the outside to the inside", we will understand the basic laws and changes of colors. Then, we will walk into the deep structure of color - the orderly "color system", and explore the meaning of color language. After the "bottom layer", we can then appreciate the surface structure of color "from the inside out" and enjoy the infinite scenery of "color shaping form". In this way, the difficult issues of style and form (writing and composition) will suddenly become clear.

Analysis is a cognitive activity that divides the whole research object into various parts, aspects, factors and levels, and examines them separately. The significance of analysis is to carefully find the main thread that can solve the problem and solve the problem accordingly.

Categorize things, phenomena, and concepts into categories to isolate their essence and their inner connections