A kind of concrete anti-segregation agent and a kind of concrete making method

This technology relates to the technical field of building material admixtures, and in particular to a concrete anti-segregation agent and a concrete.

Background technology:

Concrete water-reducing agent has been widely used in the materials and engineering circles Recognized; with the continuous promotion of commercial concrete, the amount of work required each year has gradually increased, and the demand for floor materials has also increased. In some areas, there is a problem of deterioration in the quality of floor materials. Therefore, commercial mixing stations have a higher requirement for concrete admixtures. The requirements for adaptability have also gradually increased; currently, the concrete admixtures on the market are mainly polycarboxylic acid series, naphthalene series, and aliphatic series water reducing agents; however, in the actual application process of the project, due to temperature, mud content of the floor material, etc. Factors that lead to sensitivity to the dosage of admixtures can easily cause problems such as segregation and bleeding of commercial concrete when it arrives at the construction site, making it difficult to ensure the quality of concrete construction.

It is copolymerized by 30 to 100 parts by weight of Class A monomers and 20 to 160 parts by weight of Class B monomers. The Class A monomers The monomer is any one or a mixture of two or more of acrylamide, n-hydroxymethylacrylamide, acrylic acid, and methacrylic acid in any proportion; the b-type monomer is hydroxyethyl acrylate, hydroxyethyl methacrylate Any one or a mixture of two or more esters, hydroxypropyl acrylate, hydroxypropyl methacrylate, isopentenyl alcohol polyoxyethylene ether, etc. in any proportion. The concrete anti-segregation agent synthesized by this technology is compatible with concrete. It has good properties and does not affect the strength development of concrete. It effectively solves the problem of concrete segregation and bleeding at the construction site, improves the anti-segregation performance of concrete, and makes it easy to pump.

The composition of the anti-segregation agent for concrete is as follows: 5-15 parts of fly ash, 5-15 parts of mineral powder, 1-2 parts of steel fiber, 1-2 parts of polyethylene glycol, 20-30 parts of polycarboxylate water-reducing agent, 0.8-1.2 parts of tackifier, 0.5-0.9 parts of coagulant, 200-300 parts of deionized water, several parts of liquid caustic soda, organic 5-10 parts of silicon monomer, 3-5 parts of oxidant, 1-3 parts of reducing agent. This technology adds fly ash, mineral powder and steel fiber to the anti-segregation agent, which can not only improve the compressive strength of concrete , and can also effectively improve the working performance and stratification of concrete, and improve the segregation resistance of concrete. Pam is used as the tackifier, because pam has more -nh2, making the tackifier very hydrophilic. , making the concrete hydrophilic, water-retaining, thickening, resistance-reducing and viscosity-increasing. This technology has wide sources of raw materials, low cost, green environmental protection and simple operation.

However, on the one hand, the above-mentioned patent only applies to concrete using polycarboxylate water-reducing agents, and cannot involve the use of naphthalene-based and aliphatic-based water-reducing agents. Concrete system; on the other hand, the anti-segregation agent involved in the above patent is added as a component of concrete during premixing at the commercial mixing station. In the actual application process of the project, it is affected by factors such as temperature, transportation distance, and floor material quality. The problems of segregation and bleeding will still exist when the concrete reaches the construction site; therefore, the development of an externally mixed powdery anti-segregation agent that has good compatibility and can quickly solve problems such as concrete segregation and bleeding at the construction site is a commercial concrete project. The world urgently needs it.

Technical implementation elements:

The purpose of this technology is to solve the problems in the existing technology The problem was raised by a concrete anti-segregation agent and a concrete.

In order to achieve the above purpose, this technology adopts the following technical solution:

A kind of concrete Anti-segregation agent includes the following raw material components: polyacrylamide, 2-acrylamide-2-methylpropanesulfonic acid, sodium carboxymethylcellulose, β-cyclodextrin, water glass and air-entraining agent.

Preferably, the raw materials are proportioned according to the following weight parts: 30 to 40 parts of polyacrylamide, 2-acrylamide-2-methylpropanesulfonic acid 30 to 40 parts, sodium carboxymethylcellulose 1 to 3 parts, β-cyclodextrin 2 to 10 parts, water glass 2 to 10 parts, and air entraining agent 1 to 3 parts.

Preferably, the water glass is fine powder of water glass with a modulus of 1.0.

Preferably, the air-entraining agent is one of rosin, sodium dodecyl benzene sulfonate, coconut oil diethanolamide, and sodium fatty alcohol sulfate. species or mixtures.

A kind of concrete, the anti-segregation agent and water-reducing agent are added to the concrete raw materials.

Preferably, the water-reducing agent is a naphthalene-based water-reducing agent.

Preferably, the water-reducing agent is a polycarboxylic acid-based water-reducing agent.

Preferably, the water-reducing agent is an aliphatic water-reducing agent.

Compared with the existing technology, this technology provides a concrete anti-segregation agent and a concrete, which have the following beneficial effects:

This concrete anti-segregation agent uses 2-acrylamide-2-methylpropanesulfonic acid, polyacrylamide, and carboxymethyl cellulose sodium as anti-dispersion agents, which provides good protection for concrete. cohesion and water retention; β-cyclodextrin can inhibit and adjust slump loss and maintain the fluidity of concrete; water glass can promote the hydration of concrete and accelerate concrete hardening; air-entraining agent can adjust the air content of concrete. , improve the workability of concrete; this technology is brownColor powder substances, the general dosage is 0.1-2% of concrete admixtures, which can significantly improve problems such as segregation, bleeding, and delamination of concrete. In addition, naphthalene series, polycarboxylic acid, and aliphatic concrete water-reducing agents are used, mixed with This product has good compatibility and does not affect the strength of concrete at all ages. It can be added during premixing at the commercial mixing station to improve the anti-segregation and anti-bleeding properties. It can also be added at the construction site when segregation and bleeding occur in the concrete. When there is a water problem, adding this anti-segregation agent directly into the concrete can quickly solve problems such as concrete segregation and bleeding.

<img src="/upfile/202304/2023041334528065.jpg"/