KR20010028977A - Composition of flat mortar - Google Patents

Abstract

PURPOSE: A mortar composition for the floor is provided which shows no drying shrinkage caused by a change of surrounding temperature. CONSTITUTION: The mortar composition for the floor comprises: (i) 21-23 parts by weight of cement; (ii) 69-72 parts by weight of sand; (iii) 3-4 parts by weight of fly ash; (iv) 0.003-0.005 parts by weight of a viscosity increasing agent; (v) 0-5 parts by weight of an expanding control agent which is prepared by firing a mixture of 30-50% of limestone and 50-70% of coke at a temperature of about 800 deg.C and then mixing 1 parts by weight of a dispersant with the mixture; and (vi) 0-4 parts by weight of anhydrous plaster.

Description

Floor mortar composition {COMPOSITION OF FLAT MORTAR}

The present invention relates to a mortar composition for flooring and a method for manufacturing the same, and more particularly to a mortar composition for a concrete floor in which the expansion control agent and anhydrous gypsum are formed in a known mixing ratio.

Korean Patent Publication No. 167858 is a water-soluble type of epoxy resin manufactured by combining natural stone or artificial stone carving, cement and inorganic pigments, and describes a technology for permeable or impermeable flooring depending on the content of cement. ,

In Korean Patent Publication No. 118630, calcium sulphate is used to fundamentally prevent cracking of plaster mortar by reducing voids between cement particles by providing expansion properties to cement particles by generating more hydration products during the hydration reaction of cement. It is disclosed that a technique for preparing plaster mortar for ondol by mixing

The conventional techniques have a shrinkage compensation effect in the early stage, but the dry shrinkage was increased in the late stage, the crack caused by the shrinkage, the adhesive strength is weakened, the phenomenon that the finish is peeled off from the concrete floor due to the difference in thermal expansion coefficient of the concrete and the finish There has been a problem such as.

In order to solve the problems as described above, the present invention is used by mixing the expansion mortar and anhydrous gypsum in the conventional mortar composition is combined three-dimensionally on the concrete surface, the drying shrinkage does not appear even after long-term use, thermal expansion of concrete and flooring It is also an object of the present invention to provide a mortar for floors in which dry shrinkage of flooring does not occur due to changes in ambient temperature.

In order to achieve the above object, the present invention relates to a mortar for mixing the expansion mortar and anhydrous gypsum in the mortar composed of cement, sand, fly ash, thickener and the like to reduce the shrinkage of the early and late drying uniformly. .

The expansion control agent is prepared by mixing a dispersant with one prepared by calcining a mixture of limestone 30-50 and coke 50-70 at a temperature of about 800 ° C.

The chemical composition of the expansion regulator is composed of SiO ₂ 0.48, Al ₂ O ₃ 0.23, Fe ₂ O ₃ 0.21, CaO 70.38, SO ₃ 21.85, etc., 7.19. It was found that the experimental results showed that the composition distribution is ideal for the plastic shrinkage and the initial dry shrinkage with a particle size of 88 µm or more, with a particle size of 88 µm or more, with a particle size of 88 µm or more.

The dispersant used in the above is to make the materials to be mixed well with each other, so that they can be uniformly dispersed with each other, the dispersant and anionic surface such as amine salt, quaternary ammonium salt, pyrimidinium salt Activators and ethylene oxide surfactants such as alkylaryl ethers, alkyl ethers, alkylamines, polyhydric alcohol fatty acid glycerin esters, polyhydric alcohol fatty acid ester surfactants, polyethylene amine surfactants and fatty acid alkyl solamide surfactants. Nonionic surfactants or those selected from the group consisting of two or more of these may be used.

It will be described in detail through the following examples.

Example 1 (Preparation of Expansion Regulator)

A mixture of 30 to 50 weights of limestone and 50 to 70 weights of coke is calcined at a temperature of about 800 ° C., followed by mixing 1 weight of alpha olefinsulfonate.

A floor mortar composition was prepared by adding 2 weight of the expansion regulator and 2.1 weight of anhydrous gypsum to the weight of mortar composed of 22 weight of cement, 69.9 weight of sand, and 4 weight of fly ash.

Examples 2-4

It is prepared as in Example 1 in the mixing ratio of the following Table 2 to prepare a mortar composition for floors.

[Table 1] Comparison of mortar compounding ratio

(unit : )

factory sand cement Inflating material fly ash Thickener Swelling regulator Anhydrous gypsum quicklime Conventional Technology 1 71.4-75.0 18.8-22.9 5.0-7.1 - - - - Bell's Skill 2 65-81.2 17.3-21 1.5-14 Example 1 69.9 22.0 2.0 2.1 - 4 - Example 2 72.1 21.5 0.7 1.87 0.81 3 0.005 Example 3 71.5 22.0 1.5 2.0 3 0.003 Example 4 72.0 22.0 - 1.2 1.0 3.8

Table 2 Comparison of Expansion Material Composition and Amount

(unit : )

factory Inflating material C × Expansion Material (Substituted Addition) C × Expansion regulator (additional substitution) C × anhydrous gypsum (additional substitution) C × quicklime (substituted) Swelling regulator Anhydrous gypsum quicklime Conventional Technology 1 100 20-25 20-25 0 0 Bell's Skill 2 100 (including 2 numbers) 8-40 0 8-40 0 Example 1 48.8 51.2 0 15.7 7.7 8.0 0 Example 2 20.6 55.6 23.8 13.7 2.8 7.6 3.2 Example 3 42.9 57.1 0 13.7 5.9 7.8 0 Example 4 0 54.4 45.5 9.1 0 5.0 4.1

As described above, the present invention maintains a constant shrinkage compensatory effect by early and uniformly late by using an expansion regulator and anhydrous gypsum mixed in the mortar composition to remove cracks caused by shrinkage, and weaken adhesion even at ambient temperature changes. , The effect of the expansion control material is not peeled off the concrete floor by the difference in thermal expansion coefficient between the concrete and the expansion regulator.

Claims (2)

In the bottom mortar composition, after calcining the mixture of limestone 30-50 and coke 50-70 at a temperature of about 800 ℃, after mixing the weight of the dispersant 1 to prepare an expansion regulator, For the mortar weight composed of 21 ~ 23 weight of cement, 69 ~ 72 weight of sand, 3 ~ 4 weight of fly ash and 0.003 ~ 0.005 weight of thickener, the expansion regulator 0-5 weight and anhydrous gypsum 0-4 Floor mortar composition. According to claim 1, wherein the chemical composition of the expansion regulator is composed of SiO ₂ 0.48, Al ₂ O ₃ 0.23, Fe ₂ O ₃ 0.21, CaO 70.38, SO ₃ 21.85, other, 7.19, the particle size is 150㎛ Floor mortar composition, characterized in that ~ 1mm is 15-25 weight, 88-150㎛ 15-25 weight, 88㎛ or less.