阅读说明：本技术 一种抗腐蚀型混凝土界面处理剂及其应用 (Corrosion-resistant concrete interface treating agent and application thereof ) 是由 王荣生 乐正祥 于 2020-05-12 设计创作，主要内容包括：本发明公开了一种抗腐蚀型混凝土界面处理剂及其应用,抗腐蚀型混凝土界面处理剂包含如下质量份数的各组分：矿物复合物60-90份；PP-g-GMA增容PP/椰壳粉复合纤维0.1-2份；阴离子型苯丙乳液5-20份；化学外加剂1-7份；PP-g-GMA增容PP/椰壳粉复合纤维制备过程如下：将PP 90-100份、GMA 3-10份以及DCP 0.1-1份充分混合均匀,然后在150～250℃下密炼混合得到PP-g-GMA；将PP 65-90份、椰壳粉5-15份以及PP-g-GMA 10-20份在150～250℃下共混挤出纺成所述PP-g-GMA增容PP/椰壳粉复合纤维；本发明还提供了界面处理剂在制备新老混凝土粘结过渡层中的应用。将本发明提供的界面处理剂应用在制备新老混凝土粘结过渡层时,能够起到很好的粘结作用,而且,能够保证过渡层的抗腐蚀性。(The invention discloses an anti-corrosion concrete interface treating agent and application thereof, wherein the anti-corrosion concrete interface treating agent comprises the following components in parts by weight: 60-90 parts of mineral compound; 0.1-2 parts of PP/coconut shell powder composite fiber compatibilized by PP-g-GMA; 5-20 parts of anionic styrene-acrylic emulsion; 1-7 parts of a chemical additive; the preparation process of the PP-g-GMA compatibilized PP/coconut shell powder composite fiber comprises the following steps: fully and uniformly mixing 90-100 parts of PP, 3-10 parts of GMA and 0.1-1 part of DCP, and then banburying and mixing at 150-250 ℃ to obtain PP-g-GMA; blending, extruding and spinning 65-90 parts of PP (polypropylene), 5-15 parts of coconut shell powder and 10-20 parts of PP-g-GMA (polypropylene-g-GMA) at 150-250 ℃ to obtain PP-g-GMA compatibilized PP/coconut shell powder composite fiber; the invention also provides the application of the interface treating agent in preparing the new and old concrete bonding transition layer. When the interface treating agent provided by the invention is applied to preparing a new and old concrete bonding transition layer, a good bonding effect can be achieved, and the corrosion resistance of the transition layer can be ensured.)

1. The corrosion-resistant concrete interface treating agent is characterized by comprising the following components in parts by mass:

60-90 parts of mineral compound; 0.1-2 parts of polypropylene composite modified fiber; 5-20 parts of anionic styrene-acrylic emulsion; 1-7 parts of chemical admixture.

2. The corrosion-resistant concrete interface treating agent according to claim 1, wherein the polypropylene composite modified fiber is a PP-g-GMA compatibilized PP/coconut shell powder composite fiber material.

3. The corrosion-resistant concrete interface treating agent according to claim 2, wherein the polypropylene composite modified fiber is prepared by the following steps:

fully and uniformly mixing 90-100 parts of PP, 3-10 parts of GMA and 0.1-1 part of DCP, and then banburying and mixing at 150-250 ℃ to obtain PP-g-GMA;

and (2) blending, extruding and spinning 65-90 parts of PP, 5-15 parts of coconut shell powder and 10-20 parts of PP-g-GMA at 150-250 ℃ to obtain the PP-g-GMA compatibilized PP/coconut shell powder composite fiber.

4. The corrosion-resistant concrete interface treating agent according to claim 1, wherein the chemical admixture comprises a water reducing agent, an expanding agent and an antifoaming agent.

5. The corrosion-resistant concrete interfacial treatment agent according to claim 4, wherein m (expanding agent): m (water reducing agent): m (antifoam) is 8:1: 1.

6. The corrosion-resistant concrete interface treating agent according to claim 4, wherein the antifoaming agent is an antifoaming agent of BASF2410 type; the water reducing agent is a polycarboxylic acid water reducing agent; the expanding agent is calcium sulphoaluminate expanding agent.

7. A cement paste comprising the interface treatment agent according to any one of claims 1 to 6, characterized by comprising the following components in the following weight ratio:

m (corrosion-resistant concrete interface treating agent): m (cement): m (water) ═ 1:2: 1.

8. A method of preparing the cementitious slurry of claim 7, comprising:

the corrosion-resistant concrete interface treating agent, cement and water are mixed uniformly according to a certain proportion to prepare cement slurry.

9. Use of an interface treatment agent according to any one of claims 1 to 6 in the preparation of a transition layer for the bonding of new and old concrete.

Technical Field

The invention belongs to the technical field of concrete interface treatment, and particularly relates to an anti-corrosion concrete interface treating agent and application thereof.

Background

The durability of the concrete is the function of resisting various adverse factors in the practical use environment, the strength and the appearance integrity of the concrete can be maintained for a long time, the chlorine salt corrosion in coastal areas is a main factor influencing the durability of the concrete, structures soaked in seawater generally suffer from more serious corrosion at the junction of seawater and air, and compared with structures completely submerged in seawater, water, oxygen and chloride ions at the interface are greatly abundant, and the corrosion cycle is positively promoted. Concrete structures which are not soaked in seawater can also cause durable diseases under the action of sea wind, salt mist, rainwater and the like which are full of chloride salt, moisture and oxygen, and in industrially developed areas, the concrete structures can be additionally corroded by sulfate due to the existence of sulfur dioxide in the air; in addition, factors such as wave impact, freeze-thaw damage and the like can influence the durability of the concrete in coastal areas.

In conclusion, the coastal concrete structure is more prone to damage caused by corrosion, water wave impact, freeze thawing damage and other factors, so that the coastal concrete structure needs to be reinforced, and the concrete interface treating agent is used as a transition layer for bonding new and old concrete, so that the bonding microstructure of the new and old concrete can be effectively improved, the bonding strength is improved, and the integrity of the new and old concrete is ensured.

Disclosure of Invention

In order to overcome the problems in the related art, the invention provides an anti-corrosion concrete interface treating agent, which comprises the following components in parts by mass:

60-90 parts of mineral compound; 0.1-2 parts of polypropylene composite modified fiber; 5-20 parts of anionic styrene-acrylic emulsion; 1-7 parts of chemical admixture.

The interface treating agent of the invention can greatly improve the bonding property of the interface treating agent because the interface treating agent is mixed with cement to prepare cement slurry, polymer particles in the emulsion are adsorbed on the surfaces of hydration products and unhydrated cement, and the water amount in the cement slurry is continuously reduced along with the progress of cement hydration, the polymer particles are close to each other, pores are filled, and demulsification is carried out to form a film; the cement hydration and the polymer film forming are carried out simultaneously, an interpenetrating network structure formed by interweaving cement paste and the polymer film is formed at a bonding interface, the pore structure of the cement paste is effectively refined, and the cement paste is more compact.

When the mixing amount of the anionic styrene-acrylic polymer emulsion is small, the porosity of the cement slurry is reduced, and meanwhile, calcified crystals generated by neutralization reaction are filled in pores, so that the slurry structure is compact, and the corrosion resistance is enhanced; however, when the mixing amount of the anionic styrene-acrylic polymer emulsion is larger, the porosity of the slurry is further reduced, and the calcified crystals generate slight expansion stress in pores, so that the structure of the slurry is damaged, and the corrosion resistance is weakened.

Preferably, the polypropylene composite modified fiber is a PP-g-GMA compatibilized PP/coconut shell powder composite fiber material.

The preparation process of the polypropylene composite modified fiber comprises the following steps:

fully and uniformly mixing 90-100 parts of PP, 3-10 parts of GMA and 0.1-1 part of DCP, and then banburying and mixing at 150-250 ℃ to obtain PP-g-GMA;

and (2) blending, extruding and spinning the PP65-90 parts, the coconut shell powder 5-15 parts and the PP-g-GMA10-20 parts at 150-250 ℃ to obtain the PP-g-GMA compatibilized PP/coconut shell powder composite fiber.

Preferably, the chemical admixture comprises a water reducing agent, an expanding agent and a defoaming agent.

Preferably, in the chemical admixture, m (swelling agent): m (water reducing agent): m (antifoam) is 8:1: 1.

Further preferably, the defoamer is a defoamer of BASF2410 type; the water reducing agent is a polycarboxylic acid water reducing agent; the expanding agent is calcium sulphoaluminate expanding agent.

The invention also provides a cement slurry containing the interface treating agent, which comprises the following components in parts by weight:

m (corrosion-resistant concrete interface treating agent): m (cement): m (water) ═ 1:2: 1.

The invention also provides a preparation method of the cement slurry, which comprises the following steps:

the corrosion-resistant concrete interface treating agent, cement and water are mixed uniformly according to a certain proportion to prepare cement slurry.

In addition, coconut shell powder and a proper amount of PP-g-GMA are added into the adopted polypropylene composite modified fiber, the integral tensile strength and impact strength of the polypropylene composite modified fiber can be greatly improved by utilizing the organic fiber effect of the coconut shell powder, and after the PP-g-GMA is selected as a good solubilizer between the PP and the coconut shell powder and is doped, the coconut shell powder and the PP can be tightly crosslinked, and the tensile strength and impact strength of the polypropylene composite modified fiber can be further improved, so that the strength of the treating agent can be effectively enhanced by adding the modified polypropylene composite modified fiber into the interface treating agent, the generation of concrete cracks can be slowed down, a certain bonding effect can be improved, and the tensile strength and the deformation resistance of a matrix can be effectively improved.

The invention also provides application of the interface treating agent in preparing a new and old concrete bonding transition layer.

Compared with the prior art, the invention has the following beneficial technical effects:

the anionic styrene-acrylic polymer emulsion is added into the interface treating agent, so that the bonding performance of the interface treating agent can be greatly improved, an interpenetrating network structure formed by interweaving cement slurry and a polymer film is formed at a bonding interface, the pore structure of the cement slurry is effectively refined, and the cement slurry is more compact; and the slurry structure is compact, and the corrosion resistance is effectively enhanced.

The coconut shell powder and a proper amount of PP-g-GMA are added into the adopted polypropylene composite modified fiber, the integral tensile strength and impact strength of the polypropylene composite modified fiber can be greatly improved by utilizing the organic fiber effect of the coconut shell powder, and the PP-g-GMA is used as a good solubilizer between the PP and the coconut shell powder, and after the PP-g-GMA is selected to be doped, the coconut shell powder and the PP can be tightly crosslinked, and the tensile strength and impact strength of the polypropylene composite modified fiber can be further improved, so that the strength of the treating agent can be effectively enhanced by adding the modified polypropylene composite modified fiber into an interface treating agent, the generation of concrete cracks can be slowed, a certain bonding effect can be improved, and the tensile strength and the deformation resistance of a matrix can be effectively improved.

In conclusion, when the interface treating agent provided by the invention is applied to preparing a new and old concrete bonding transition layer, a good bonding effect can be achieved, and the corrosion resistance of the transition layer can be ensured.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention are clearly and completely described below, and it is obvious that the described embodiments are a part of the embodiments of the present invention, but not all of the embodiments.

Thus, the detailed description of the embodiments of the present invention provided below is not intended to limit the scope of the invention as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The technical solution of the present invention will be explained with reference to specific embodiments.

The defoamers used in the following examples and comparative examples were defoamers of the type BASF2410, supplied by BASF, germany; the anionic styrene-acrylic emulsion is likewise an anionic styrene-acrylic emulsion of type PII, supplied by Pasteur, Germany.