KR-102959835-B1 - A self leveling mortar compound and construction process using thereof

Abstract

The present invention relates to a self-leveling mortar composition and a method of application thereof. More specifically, the invention discloses a technical field concerning a self-leveling mortar composition and a method of application thereof in which Portland cement, belite sulfoaluminate, and calcium sulfoaluminate are mixed to secure early strength and long-term strength, while ionic nanocellulose is added to improve the dispersion stability of the mortar and induce a uniform hydration reaction to minimize material separation, as well as prevent shrinkage due to drying to suppress cracking, and silica fume and a shrinkage reducing agent are added to improve durability by supplementing wear resistance and shrinkage.

Inventors

• 조정현

Assignees

• 한일콘(주)

Dates

Publication Date

20260511

Application Date

20250529

Claims (10)

1. Based on 100 parts by weight of ordinary Portland cement, the composition comprises 20 to 70 parts by weight of belite sulfoaluminate cement, 80 to 120 parts by weight of calcium sulfoaluminate, 50 to 70 parts by weight of anhydrous gypsum, 50 to 70 parts by weight of limestone, 3 to 7 parts by weight of silica fume, 1065 to 1265 parts by weight of fine aggregate, 350 to 370 parts by weight of water, 15.5 to 19.5 parts by weight of polymer, 0.43 to 0.63 parts by weight of hardening accelerator, 2 to 4 parts by weight of calcium formate, 1 to 3 parts by weight of fluidizing agent, 0.5 to 1.5 parts by weight of thickening agent, 0.8 to 1.8 parts by weight of setting retarder, 1.3 to 2.3 parts by weight of defoaming agent, and 0.5 to 1.5 parts by weight of shrinkage reducing agent; The above fine aggregate is It is composed of 125 to 145 parts by weight of calcium carbonate, 823 to 843 parts by weight of silica sand with a diameter of 0.075 to 0.1 mm, and 187 to 207 parts by weight of silica sand with a diameter of 0.25 to 0.6 mm; The above polymer is It is characterized by being vinyl acetate-ethylene (VAE), The above curing accelerator Self-leveling mortar composition characterized by being titanium sulfate.
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5. In paragraph 1, The above shrinkage reducing agent A self-leveling mortar composition characterized by being composed of one or more of polyethylene glycol (PEG), propylene glycol, ethylene oxide copolymer, and propylene oxide copolymer.
6. Based on 100 parts by weight of ordinary Portland cement, the composition comprises 20 to 70 parts by weight of belite sulfoaluminate cement, 80 to 120 parts by weight of calcium sulfoaluminate, 50 to 70 parts by weight of anhydrous gypsum, 50 to 70 parts by weight of limestone, 3 to 7 parts by weight of silica fume, 1065 to 1265 parts by weight of fine aggregate, 350 to 370 parts by weight of water, 15.5 to 19.5 parts by weight of polymer, 0.43 to 0.63 parts by weight of hardening accelerator, 2 to 4 parts by weight of calcium formate, 1 to 3 parts by weight of fluidizing agent, 0.5 to 1.5 parts by weight of thickening agent, 0.8 to 1.8 parts by weight of setting retarder, 1.3 to 2.3 parts by weight of defoaming agent, and 0.5 to 1.5 parts by weight of shrinkage reducing agent; The above thickener Self-leveling mortar composition characterized by being ionic nanocellulose.
7. In paragraph 6, The above ionic nanocellulose is Self-leveling mortar composition characterized by being anionic nanocellulose.
8. In paragraph 6, The above ionic nanocellulose is Self-leveling mortar composition characterized by being cationic nanocellulose.
9. In paragraph 6, The above ionic nanocellulose is A self-leveling mortar composition characterized by a weight ratio of anionic nanocellulose to cationic nanocellulose of 1:2.
10. a) Defect treatment and cleaning step of the construction surface; b) A step of applying a primer or new-old adhesive to the construction surface of step a) above; c) a step of pouring a self-leveling mortar composition according to any one of claims 1, 5 to 9 onto a construction surface coated with a primer or a new-old adhesive; and d) a step of curing the above mortar composition; characterized by a method for constructing a self-leveling mortar composition.

Description

A self-leveling mortar compound and construction method using thereof The present invention relates to a self-leveling mortar composition and a method of application thereof. More specifically, the invention relates to a self-leveling mortar composition and a method of application thereof in which Portland cement, belite sulfoaluminate, and calcium sulfoaluminate are mixed to secure early strength and long-term strength, while ionic nanocellulose is added to improve the dispersion stability of the mortar and induce a uniform hydration reaction to minimize material separation and prevent shrinkage due to drying, thereby suppressing cracking, and silica fume and a shrinkage reducing agent are added to improve durability by supplementing wear resistance and shrinkage. Self-leveling mortar has excellent fluidity and is widely applied for the construction of flat surfaces for building floors, the formation of flat floors for remodeling, and floor construction for factories, parking lots, etc., due to its self-leveling properties that form a level surface on their own. General self-leveling mortar hardens within one day, and most of the surface moisture dries within about seven days, allowing subsequent work such as applying topcoats or bonding flooring to proceed. However, leveling the floor surface is very difficult, and if pretreatment such as primer application on the construction surface is not done properly, or if various construction factors such as discontinuous pouring, non-uniformity of material quality, and water-to-water ratio management are not properly controlled, many problems such as cracking, peeling, and surface irregularities occur. In particular, during curing, strict management is required, such as closing all doors and windows to prevent rapid drying caused by sunlight or wind until it is fully hardened. In particular, common problems encountered in the application of self-leveling mortar include delayed hardening due to a high water-to-cement ratio and the resulting increased shrinkage, delays in subsequent processes caused by slow drying speeds, and reduced durability due to low strength. Therefore, there has been a continuous demand for performance improvements in self-leveling mortar, and especially in remodeling projects, there is a need for high-strength mortar with faster drying times and strength development to shorten construction time. Conventional self-leveling mortar compositions are mostly manufactured by mixing Portland cement with a rapid-hardening agent, or Portland cement with a small amount of alumina cement or calcium sulfoaluminate, and gypsum as the main binder, along with aggregates, fillers, chemical additives such as powder resins and high-fluidity agents, and hardening accelerators for strength development. These conventional products suffer from problems such as slow setting and strength development, and particularly at low temperatures, very slow surface drying, which not only prolongs the construction period but also reduces durability and increases construction defects due to the delayed strength development. The present invention relates to a self-leveling mortar composition and a method of application thereof. More specifically, the invention relates to a self-leveling mortar composition and a method of application thereof in which Portland cement, belite sulfoaluminate, and calcium sulfoaluminate are mixed to secure early strength and long-term strength, while ionic nanocellulose is added to improve the dispersion stability of the mortar and induce a uniform hydration reaction to minimize material separation and prevent shrinkage due to drying, thereby suppressing cracking, and silica fume and a shrinkage reducing agent are added to improve durability by supplementing wear resistance and shrinkage. The self-leveling mortar composition of the present invention as described above comprises, based on 100 parts by weight of ordinary Portland cement, 20 to 70 parts by weight of belite sulfoaluminate cement, 80 to 120 parts by weight of calcium sulfoaluminate, 50 to 70 parts by weight of anhydrous gypsum, 50 to 70 parts by weight of limestone, 3 to 7 parts by weight of silica fume, 1065 to 1265 parts by weight of fine aggregate, 350 to 370 parts by weight of water, 15.5 to 19.5 parts by weight of polymer, 0.43 to 0.63 parts by weight of hardening accelerator, 2 to 4 parts by weight of calcium formate, 1 to 3 parts by weight of fluidizing agent, 0.5 to 1.5 parts by weight of thickening agent, 0.8 to 1.8 parts by weight of setting retarder, 1.3 to 2.3 parts by weight of defoamer, and 0.5 to 1.5 parts by weight of shrinkage reducing agent. It is characterized by being composed including a weight portion. In addition, the fine aggregate of the present invention is characterized by comprising 125 to 145 parts by weight of calcium carbonate, 823 to 843 parts by weight of silica sand with a diameter of 0.075 to 0.1 mm, and 187 to 207 parts by weight of silica sand with a d