KR-20260062171-A - composition of polymer mortar and concrete repair and supplement method thereof

Abstract

The present invention relates to a polymer mortar composition for crack repair, and more specifically, is characterized by comprising: a polymer mortar comprising 100 parts by weight of a binder, 10 to 100 parts by weight of natural mineral powder, 10 to 30 parts by weight of polymer powder, 10 to 20 parts by weight of silica sand, 10 to 20 parts by weight of fiber reinforcement, and 1 to 10 parts by weight of an antifoaming agent; and a reinforcing composition comprising 100 parts by weight of an acrylic emulsion, 10 to 50 parts by weight of an adhesion promoter, and 100 to 150 parts by weight of a filler. According to the present invention, there are advantages such as excellent adhesion and durability with concrete structures, excellent water resistance, no problems of efflorescence or strength reduction even after curing, and long-term elasticity, thereby maintaining the crack repair effect for a long period.

Inventors

• 박현서

Assignees

• 박현서

Dates

Publication Date

20260507

Application Date

20241025

Claims (6)

1. A polymer mortar comprising 100 parts by weight of a binder, 10 to 100 parts by weight of natural mineral powder, 10 to 30 parts by weight of polymer powder, 10 to 20 parts by weight of silica sand, 10 to 20 parts by weight of fiber reinforcement, and 1 to 10 parts by weight of an antifoaming agent; A polymer mortar composition for crack repair characterized by comprising: a reinforcing composition comprising 100 parts by weight of an acrylic emulsion, 10 to 50 parts by weight of an adhesion promoter, and 100 to 150 parts by weight of a filler.
2. In paragraph 1, The above natural mineral powder is, It is one or more of diatomite, vermiculite, zeolite, loess, and illite, and its average particle size is 1 to 50 µm, and A polymer mortar composition for crack repair characterized in that the above-mentioned filler is one or more of aluminum silicate, calcium carbonate, talc, and bentonite.
3. In paragraph 2, A polymer mortar composition for crack repair characterized by the above-mentioned filler further comprising nanocellulose fibers and cellulose partial carbons.
4. In paragraph 3, A polymer mortar composition for crack repair characterized in that the above nanocellulose fibers and cellulose partial carbonized bodies are surface-treated with 2-ethylhexyl acrylate.
5. In any one of paragraphs 2 through 4, A polymer mortar composition for crack repair characterized by the above-mentioned filler further comprising carbon nanotubes composited with polyethylene.
6. In paragraph 1, A polymer mortar composition for crack repair characterized by containing the polymer mortar and the reinforcing composition in a weight ratio of 1:0.1 to 0.5.

Description

Polymer mortar composition for crack repair {composition of polymer mortar and concrete repair and supplement method thereof} The present invention relates to a polymer mortar composition for crack repair, and more specifically, to a polymer mortar composition for crack repair that improves efflorescence and strength by mixing a reinforcing composition into the polymer mortar. In general, the current trend in concrete favors high strength and high fluidity. However, crack control is critical for such high-strength, high-fluidity structures, and managing them is currently difficult. In addition, when repairing and reinforcing concrete structures, mortar-based or cement-based waterproofing methods, which mix additives with cement and sand that are homogeneous to the structure, are generally widely used and preferred. However, a problem with these conventional methods is the occurrence of initial cracks, the causes of which include drying shrinkage due to moisture evaporation during the initial construction phase, shrinkage and expansion of the concrete structure, freeze-thaw cycles caused by the shrinkage and expansion of internal moisture in the concrete during winter, external impacts and vibrations, and issues with waterproofing materials. In particular, when mortar is in a plastic state, shrinkage occurs due to rapid moisture evaporation; this shrinkage generates surface tensile forces through internal confinement of the undried mortar, frequently inducing cracking. The biggest problem is that once these plastic cracks occur, they do not remain stationary but continue to develop, exhibiting the phenomenon of brittle cracking. Once cracks occur, they accelerate the aging of the structure and the occurrence of secondary cracks, lead to poor adhesion, cause moisture penetration resulting in rust on the rebar, and cause a decrease in the durability of the structure over the long term. Therefore, most construction methods have the problem of requiring secondary processes such as protective mortar and protective sheets to protect the waterproofing layer. Therefore, there is a growing demand for materials that are homogeneous to concrete structures, improve crack resistance, prevent further crack progression even if cracks occur, and possess enhanced characteristics such as adhesion, permeability, workability, reinforcement, and long-term durability that are homogenized with concrete structures. Meanwhile, epoxy resin, which has been used for crack repair, is a material primarily used as an adhesive in dry environments. Although it has been mainly used to reinforce structural load-bearing capacity due to its high strength, it has limitations in terms of physical properties such as low adaptability to deformation after curing and susceptibility to environmental influences. Furthermore, since its main component differs from the concrete substrate, there is a problem of poor integrity with the concrete structure. Consequently, crack repair using epoxy resin not only results in a high frequency of re-repairs due to delamination and damage after the work is performed but also has limitations in waterproofing performance. In addition, polymer cement mortar, which has been used as a crack repair material, exhibits superior integration characteristics with structures compared to epoxy resin, but it has the problem of developing efflorescence and weakening strength as it hardens over time. The present invention will be described in detail below. Polymer cement mortar has been used for repairing cracks in conventional concrete structures, but there were problems such as a decrease in strength and the appearance of efflorescence over time. Accordingly, the present invention improves all these problems by further including a reinforcing composition, and more specifically, is characterized by comprising: a polymer mortar comprising 100 parts by weight of a binder, 10 to 100 parts by weight of natural mineral powder, 10 to 30 parts by weight of polymer powder, 10 to 20 parts by weight of silica sand, 10 to 20 parts by weight of fiber reinforcing material, and 1 to 10 parts by weight of defoaming agent; and a reinforcing composition comprising 100 parts by weight of an acrylic emulsion, 10 to 50 parts by weight of an adhesion promoter, and 100 to 150 parts by weight of a filler. First, the polymer mortar according to the present invention will be described in detail. First, one or more of cement, hydrated lime, anhydrous gypsum, and blast furnace slag fine powder may be used as the binder, and most preferably, Portland cement and anhydrous gypsum are used. Since such binders have been sufficiently disclosed in the past, further explanation regarding them is omitted. Hereinafter, the 'weight parts' of the polymer mortar are based on 100 weight parts of the binder in the polymer mortar. The above natural mineral powder is intended to strengthen adhesion and alleviate efflorescence, and it is preferable to use one or more of diat