KR0180111B1 - Waterproofing cement mortar composition - Google Patents

Abstract

The present invention relates to a waterproof cement mortar composition effective for waterproofing buildings.

The present invention is based on a waterproof base mortar composition composed of silica and portland cement having a particle size adjusted, a re-emulsifying powder resin, a surfactant for reducing the surface tension of water and improving the wettability, and a cellulose ethyl-based system for improving viscosity and water retention of the mortar slurry. It is a waterproof cement mortar composition made by adding a physical property improving agent such as a thickener, a water-repellent calcium stearic acid-based fatty acid metal salt, and a cellulose-based short fiber having a length of 2 mm or less.

Description

Waterproof Cement Mortar Composition

The present invention relates to a waterproof cement mortar composition effective for waterproofing a building, and more specifically, unlike a liquid or powdery waterproofing agent used by mixing with cement in an existing site, cement and particle size-adjusted silica sand and various physical properties improving agents are suitable. The present invention relates to a waterproof cement mortar composition which is preliminarily mixed in a formulation to significantly improve waterproof performance and workability.

The waterproofing method of buildings can be largely classified into liquid waterproofing using cement, sheet waterproofing using synthetic polymers, waterproofing of coating film, and waterproofing asphalt, and have unique areas according to the materials used.

In particular, liquid waterproofing using cement is mainly applied to the basement and indoor waterproofing of apartment houses, general stores, and detached houses. Cement liquid waterproofing means adding waterproofing liquid to cement and mortar to express waterproofing to impart water repellency and water tightness of hardened body. There are five major methods used to express these characteristics.

First, the method of increasing the resistance to permeation by densifying the hardening body by activating the initial hydration reaction of cement, such as sodium silicate, calcium chloride, alumina silicate.

Second, a method of increasing the watertightness of tissues by converting calcium hydroxide, which is a soluble hydrate of cement, into an insoluble salt, or by transferring to calcium silicate hydrate.

Third, a method for preventing absorption by forming a water-repellent, impermeable film in the cured body.

Fourth, the method of waterproofing by reducing the required amount by improving the workability, thereby increasing the water-tightness of the cured body to densify.

Fifth, there is a method of densifying by filling the pores of the hydrated tissue physically by adding fine mineral powder, such as silica fume, fly ash, silica-alumina fine powder.

Most of the waterproofing agent for cement currently used is a combination of various components to achieve the above-mentioned performance. That is, a method of adding a hardening accelerator, a surfactant, a polymer resin, and an active silica fine powder to a high fatty acid metal salt subject mainly to impart water repellency (Patent Publication 79-621, 87-1543, 90-5403), to a high fatty acid metal salt solution. A method for preparing a film forming aid such as a polymer resin, a plasticizer, a curing accelerator, and a paraffin (Patent Publications 83-20, 84-2177, 82-2073), and a higher fatty acid for improving its dispersibility in higher fatty acid metal salts. And a method of adding a surfactant such as a polyhydric alcohol ester or a naphthalene sulfonic acid formaldehyde high condensate system (Japanese Patent Publication 54-124021).

Most of the waterproofing agent compositions shown up to now are prepared by adding a fatty acid-based metal salt for imparting water repellency as a basic composition, and adding a curing accelerator, a dispersant, a polymer resin, etc. to enhance the strength and watertightness of the cured product. However, these waterproofing agents contribute to the waterproofing of the cement, but the formation of the desired waterproofing layer is accompanied by the following problems in terms of materials and methods of use.

Powder type waterproofing agents are mostly mixed with cement and mortar in the field, so the difference in specific gravity between the materials themselves, floating on the surface when mixing with water due to inhomogeneity of mixing, deterioration of waterproofing performance due to ubiquitous materials, Problems such as deterioration of the surface and inhomogeneity of performance occur. In addition, the components of the fatty acid metal salt system to be used have a disadvantage in that the mixing time with water is difficult to work.

Liquid type waterproofing agent is more dispersible than powder form when diluted in water, but most of them are based on the water-soluble fatty acid metal salt melt. There is a possibility that the structure becomes porous, and the hydration of the cement is delayed, resulting in a decrease in strength and a delay in condensation. In addition, the water-repellent liquids are often absorbed by the water-repellent components in the concrete matrix to be lifted between the waterproof layer and the concrete matrix.

The waterproofing method using cement is not determined by the performance of the waterproofing agent used, but rather the shrinkage cracking, peeling, workability (use amount), water retention, water repellency, and compactness of the cement mortar waterproofing layer are combined to show the desired performance.

Therefore, in order to waterproof the cement, the appropriate conditions for manufacturing cement mortar should be preceded in consideration of shrinkage cracking and peeling prevention, water retention, and workability. This property can not be solved only by the waterproofing agent used, it can be made by the particle size of the silica sand used in the mortar manufacturing, the mixing ratio of the cement, the selection of the physical properties improver and the appropriate blending.

However, in the past, since the mixing of the waterproofing liquid, cement and silica sand is artificially performed by the worker at the site, the waterproof performance is due to various external factors such as the skill of the contractor, the conditions of use, the mixing ratio with the silica used, and the mixing property. There is a problem that a deviation occurs.

Silica sand used in the production of cement mortar varies in nature and particle size depending on the place of production. Therefore, it is practically impossible to manage the particle size of the silica sand used in the field constantly. If the particle size of the silica used is too thin or thick, when the clay is mixed a lot, the physical properties of the mortar are greatly reduced, and it acts as a major factor that lowers the waterproofing performance.

In addition, in the existing waterproof construction, the cement paste (hereinafter, cement paste) prepared by mixing the waterproofing liquid with cement alone (hereinafter, cement paste) before the mortar waterproofing is reinforced to have a waterproof mortar finish. Existing on-site mixing and construction method is to improve the performance of adhesion and denseness by applying cement paste because the density, water repellency, resistance to permeability, and adhesion to silica sand are greatly inferior to waterproof mortar. Accordingly, there is a problem of increasing the construction thickness and repeating the construction process.

Most of the prior arts focused only on the modification of the components of the waterproofing agent used, and there were many aspects that fundamentally improved the physical properties of the cement mortar and the actual use situation in the field.

Accordingly, the present inventors can improve the workability to reduce the amount of use, and to greatly increase the compactness and shrinkage of the cured product when the mortar on the powder is adjusted to the closest filling by adjusting the particle size of the silica sand and the mixing ratio of cement. Based on this, the mortar composition was studied.

Accordingly, the present invention solves the problems of the prior art, silica sand and water-soluble re-emulsified polymer powder resin, surfactant, viscosity modifier, high-fat fatty acid metal salt powder, cellulose adjusted to the appropriate particle size in the cement to improve the site construction properties and construction performance It is an object of the present invention to provide a waterproof cement mortar composition prepared by mixing the staple fibers in a factory in advance.

The present invention is 2 to 6 parts by weight of re-emulsified powder resin, based on 100 parts by weight of waterproof base mortar composition composed of 70 to 130 parts by weight of Portland cement with respect to 100 parts by weight of silica sand adjusted to a particle size in the range of 1.4 to 0.07 mm, 0.1 to 0.4 parts by weight of surfactant for reducing the surface tension of water and improving wettability, 0.05 to 0.20 parts by weight of cellulose ethyl-based thickener for improving viscosity and water retention of mortar slurry, and 0.3 to 0.3 parts by weight of water-repellent calcium stearic acid-based fatty acid metal salt Waterproofing mortar composition consisting of 0.3 to 0.7 parts by weight of cellulose-based short fibers of 1.0 parts by weight, 2 mm or less in length.

The action of each component constituting the composition of the present invention as described above is as follows.

The silica sand has a particle size adjusted in the range of 1.4 to 0.07 mm to use 100 parts by weight, most preferably 5 parts by weight of 1.4 to 1.0 mm silica sand, 30 parts by weight of 1.0 to 0.6 mm silica sand, 0.6 to 0.3 mm A silica sand having a particle size adjusted to 20 parts by weight of silica sand, 35 parts by weight of 0.3 to 0.15 mm of silica sand and 10 parts by weight of silica sand of 0.15 to 0.07 mm is used.

However, when the size of the silica sand is larger than the above maximum range, there is an effect of increasing the strength and reducing the shrinkage, but the water retention and the compactness of the surface are lowered, the thickness of the mortar is thickened, the increase of the material usage, the concrete in the vertical plane Disadvantages such as deterioration of the matrix and adhesion will appear.

In addition, when the grain size of the silica sand is fine below the minimum range, the stickiness is increased to increase the water retention, and the surface state is smooth and satisfactory, but the required amount is increased so that the density and strength of the cured product are reduced, and the shrinkage crack is severely generated.

In the present invention is added in the range of 70 to 130 parts by weight of Portland cement with respect to 100 parts by weight of silica sand having a particle size distribution as described above.

When the Portland cement content is less than 70 parts by weight, the compactness of the hardened body is lowered, and the resistance to permeability is lowered. When the content of the Portland cement is more than 130 parts by weight, cracks are generated on the surface due to the use of excessive cement. do.

In order to improve the water resistance of mortar, the hardened structure of cement mortar needs to be dense and high in watertightness. In order to increase the compactness, unlike the conventional mortar compounding, the cement compounding ratio must be high. In the general mortar compounding, when the compounding ratio of cement to silica sand is increased, shrinkage cracking becomes a problem.

However, the mortar prepared using the silica sand having the same particle size as in the present invention does not cause a problem of cracking even if the cement compounding amount is increased than conventional cement mortar, and thus a compact hardened body can be produced.

The base mortar composition prepared by the mixing ratio of silica and cement with the particle size adjusted as described above greatly increases the workability of the mortar (reduced amount of use), and the kneaded mortar maintains the proper water repellency. The plastic shrinkage crack by this can be prevented, a dense hardened structure can be obtained, and the resistance to permeability becomes high. In addition, the adhesion can be enhanced by the reduction of dry shrinkage in the long-term age and maintaining adequate moisture retention.

In addition, in the present invention, re-emulsified polymer powder resin is added to improve brittleness, lowering of elasticity (extension), adhesion, and preventing dissolution of soluble hydrates in cement hydrates.

Re-emulsified polymer powder resin is dissolved in water and bridging between cement hydrates, cement and aggregate (silica sand) during the hydration process of cement or filling voids with polymer film to enhance the density of tissues and enhance elasticity and brittleness. . In addition, the coating on the soluble hydrate prevents the outflow due to their dissolution, and serves to promote adhesion to the concrete when applied to the concrete matrix.

Emulsified polymer powder resins include ethylene-vinyl chloride-vinyl laurate, ethylene-vinyl acetate, vinyl acetate-vinyl versatate-vinyl laurate and the like, and particularly preferably ethylene-vinyl chloride-vinyl laurate. Rate meter is used.

The addition amount of the reemulsification type polymer powder resin is 2 to 6 parts by weight based on 100 parts by weight of the base mortar composition, and when the amount is less than 2 parts by weight, the effect of addition is not largely recognized. It is not desirable because it is inferior to economics.

In addition, in the present invention, the surfactant is added in an amount of 0.1 to 0.4 parts by weight based on 100 parts by weight of the base mortar composition so that the surface tension of the water and the water-repellent material are well stirred with the water.

As the surfactant, a mixture of hydrocarbon and polyglycol or a lower alcohol-alkyloxide mixture is used.

The surfactant lowers the surface tension of water to explode the air bubbles generated during the mortar agitation process, suppresses the generation of bubbles, helps to densify the hardened tissue, and increases the wetting performance of the water, which also stirs well with the water-repellent material. To do it. In addition, it is possible to reduce the surface tension of the water to reduce the shrinkage of the waterproof mortar cured body.

This is because condensed water is present in the fine capillary pores in the cement mortar cured body, and they are formed into concave surfaces. At this time, the tension of the water in the capillary tube acts as a main factor of the dry shrinkage, and the capillary tension appears as a function of the surface tension of the water and the radius of curvature.

ΔP = r (1 / r ₁ + 1 / r ₂ )

ΔP: Capillary tension (dyn / cm 2) contained in the micropores of the mortar cured product

r: surface tension of capillary pore water (dyn / cm)

r ₁ , r ₂ : change of curvature of water surface (cm)

When the surface tension of water falls, the capillary tension decreases, and the shrinkage stress of the cured mortar decreases.

When the surfactant is added in an amount of 0.1 parts by weight or less based on 100 parts by weight of the base mortar, the use effect is not recognized, and when 0.4 parts by weight or more is added, curing is delayed, and a phenomenon in which strength and water repellency are lowered appears.

In the present invention, 0.05 to 0.2 parts by weight of a cellulose ethyl-based thickener is added to 100 parts by weight of the waterproof base mortar in order to adjust the viscosity of the mortar in order to secure proper coating thickness and improve water retention and adhesion in the waterproof construction process. .

The thickener is hydroxy ethyl methyl cellulose which is water soluble and nonionic and preferably has a viscosity in the range of 1500 to 8000 cps.

If the amount of the thickener is less than 0.05 parts by weight, there is no use effect, and when added in excess of 0.2 parts by weight, the workability is rather deteriorated due to the increase in viscosity, and the formation of fine entrained air bubbles increases.

In order to increase the water repellency and permeability of the mortar cured body in the present invention, the higher fatty acid-based metal salt powder is added in the range of 0.3 to 1.0 parts by weight based on 100 parts by weight of the waterproof base mortar.

The higher fatty acid metal salt plays an effective role in preventing the penetration of water into the capillary pores by increasing the contact angle between the hardened mortar and the water. The higher fatty acid-based metal salts are preferably stearic acid salts in which metal ions such as aluminum, zinc, and calcium are bound, and calcium stearate salts with calcium metal salts are particularly preferred because they have good affinity with cement.

When the amount of calcium stearate added is 0.3 parts by weight or less, the water repellent effect is small when added. When it is added by 1.0 parts by weight or more, the water repellency is good, but it is difficult to mix with water, which lowers workability and prevents normal hydration of cement. It was found to be unfavorable because the strength of the sea was low and its adhesion to sand was reduced due to excessive water repellency.

In addition, in the present invention, 100% by weight of base mortar for waterproofing cellulose-based short fibers that are not dissolved in water to prevent the falling down during the application of the vertical wall of the waterproof mortar and to prevent plastic shrinkage cracking of the surface of the waterproof mortar during rapid curing. Add 0.3 to 0.7 parts by weight relative to the part.

Cellulose-based short fibers are fine fibers with a length of at least 10 to 2000 µm in length, forming a three-dimensional matrix between cement and silica sand in the waterproof mortar cured body to prevent shrinkage cracking due to plastic deformation during initial curing. By containing water in the framework and releasing it constantly, the cement can hydrate reliably at an early age.

When the amount of the cellulose-based short fibers is 0.3 parts by weight or less, the effect is lowered, and when 0.7 parts by weight or more, the phenomenon of aggregation between the fibers due to the excessive addition, the required amount is increased.

In addition, in the general waterproof construction method, the cement paste is first applied to a thickness of 1 mm to 2 mm, and the sand used in the field is sand that is sieved to 5 mm or less. In contrast, the composition of the present invention only needs to be applied with the present composition without the need for a separate cement paste process. In terms of construction thickness, it is possible to exhibit a better mortar waterproof performance than conventional in the thickness of about 3 to 6 mm.

Hereinafter, the present invention will be described in more detail with reference to Examples.

[Production Examples 1 to 3]

After mixing in the formulation as shown in Table 1 was mixed uniformly in a hexagonal mixer to prepare a waterproof base mortar.

[Comparative Production Examples 1 to 8]

Waterproof base mortar was prepared in the same manner as in Example 1 in the same formulation as in Table 1.

[Test Example 1]

Prepare the waterproof base mortar prepared in Preparation Examples 1 to 3 and Comparative Preparation Examples 1 to 8 as a specimen, and measure the compressive strength, absorption and permeability resistance according to the test method for building cement waterproofing agent (KS F 2451), L 5219), mortality change by age and direct tensile bond strength with concrete were measured.

At this time, the required amount of the mortar used in the mortar prowess of the KS L 5105 was tested by grabbing the amount so that the prowess of mortar in the range of 110 ± 5. These results are shown in Table 2.

Note 1) Water absorption: Water absorption after immersion for 24 hours (g)

Note 2) Water permeability: water permeability after water pressure of 0.1㎏ / ㎠ for 1 hour (g)

As shown in Table 2, the waterproof base mortar composition according to the present invention appears to have a very high permeability resistance in the physical properties of the mortar itself, exhibiting good performance in terms of water retention, adhesion strength, length change. It is believed that the reason for this is that the particle size of the silica sand is adjusted to have the optimum filling property, and the reduction in the amount of use and the compactness are enhanced. Therefore, it is possible to secure watertightness and compactness according to the amount of cement blended, to improve water retention, to reduce the construction thickness, and to greatly reduce the cracking phenomenon due to the cement submixture.

[Examples 1-3]

With respect to 100 parts by weight of the waterproof base mortar composition of Preparation Example 2, the additives of the present invention were added in a composition ratio as shown in Table 3 and uniformly mixed in a hexagonal mixer to prepare a waterproof cement mortar composition of the present invention.

Note 1) Waterproof base mortar: Base mortar composition obtained in Preparation Example 2

Note 2) Re-emulsified powder resin: Ethylene-vinyl chloride-vinyl laurate

Note 3) Surfactant: Mixed composition of hydrogen carbonate and polyglycol

Note 4) Thickener: hydroxy ethyl methyl cellulose (viscosity 8,000 cps)

Note 5) High fatty acid metal salt: calcium stearate

Note 6) Cellulose short fiber: Average particle size 300 ~ 800㎛

Comparative Example 1

Existing liquid-type waterproof products were diluted by the manufacturer's method of use, and test specimens were prepared by the liquid waterproofing engineer in the same manner as the site. The dilution ratio was diluted 10 times with respect to the stock solution 1 of the waterproofing solution, and then coated with cement paste and cement mortar in order to prepare a test specimen. At this time, the mixing conditions for preparing the cement paste were mixed at a weight ratio of 0.5 diluted waterproof solution in cement 1, and cement mortar was prepared by mixing at a weight ratio of ordinary steel sand 2, diluted waterproof liquid 0.6 diluted with 5 mm sieve. .

Comparative Example 2

Existing liquid-type waterproof products were diluted by the manufacturer's method of use, and test specimens were prepared in the same manner as the site by a liquid waterproofing engineer. The dilution ratio was diluted by 1 times of water with respect to the stock solution 1 of the waterproofing solution, and then cement paste and cement mortar were sequentially applied to prepare test specimens. At this time, the mixing conditions for preparing the cement paste were mixed at a weight ratio of 0.45 of the waterproof solution diluted in cement 1, and cement mortar was prepared by mixing at a weight ratio of ordinary steel sand 2, 0.55 diluted waterproof solution, filtered through a 5 mm sieve. .

Comparative Example 3

Cement paste and cement mortar were prepared without the addition of a liquid waterproofing solution to prepare test specimens. At this time, the mixing conditions for preparing the cement paste were prepared by mixing cement mortar with a weight ratio of 0.50 water in cement 1 and a weight ratio of 0.60 of regular steel sand filtered with 5 mm sieve.

[Test Example 2]

22 parts by weight of water were mixed with 100 parts by weight of the compositions of Examples 1 to 3, mixed in a mortar mixer, and applied to a coating thickness of 4 mm to evaluate physical properties according to the following physical property measurement method, In addition, the prepared test specimens of Comparative Examples 1 to 3 were evaluated for physical properties in the same manner. The test results are shown in Table 4.

[Water absorption amount measurement]

-The compound of Examples 1 to 3 and Comparative Examples 1 to 3 of the present invention was applied to the upper end of the specimen for measuring the concrete compressive strength of 10 cm in diameter (concrete formulation: 25-210-12 formulation, 28 days curing).

In Examples 1 to 3 of the present invention, a waterproof mortar slurry prepared by mixing 22 parts by weight of water was applied to the upper end of the concrete specimen to have a thickness of 4 mm.

Comparative Examples 1 to 3 were first applied to the prepared shimpoules with a thickness of 1 to 2mm, and immediately before the cement paste was cured, cement mortar was applied to the cement paste layer with a coating thickness of 8 to 10mm.

Each specimen was cured in a laboratory atmosphere (temperature: 20 ± 2 ° C.) for 27 days after application, and then dried in a dryer at a temperature of 80 ° C. for 24 hours. The dried test piece was immersed in a water bath so as to immerse a depth of 5 cm with the waterproof layer as the bottom. The water absorption after immersion 1 and 24 hours was measured.

-The sides were coated with epoxy to have a height of 8 to 10 cm in height so that water was allowed to contact only the waterproof layer on the bottom surface before immersion, and the thickness of the dried specimen was measured before immersion.

[Water Permeation Measurement]

After the production and curing of Examples 1 to 3 and Comparative Examples 1 to 3 in the same manner as the specimen for water absorption amount test on the concrete disc (concrete specimen conditions are the same) to 15 cm in diameter, 5 cm in height, the water pressure 0.1㎏ / ㎠, 1 The test was performed on a mortar permeability tester for a period of time. The mortar's permeability was evaluated by measuring the mortar weight before and after the permeation test after 1 hour.

[Adhesive strength measurement]

After the concrete plate was made to have a width of 30 cm and a height of 50 cm (concrete specimen conditions were the same), Examples 1 to 3 and Comparative Examples 1 to 3 of the present invention were formulated in the same manner as the water absorption test specimen and applied to the concrete surface. do. After 28 days of curing, the bond strength between the waterproof layer and the concrete was measured using a dry tensile strength tester.

[Measurement of change in length]

Example 1 to 3 and Comparative Examples 1 to 3 of the present invention were combined with a stable mortar specimen (size: horizontal, vertical 4 cm, length 16 cm), which had no shrinkage deformation, in the same manner as the specimen for water absorption test. Was applied. After attaching a square glass plate to both ends of the applied waterproof layer, the initial length was measured, and after 28 days, the shrinkage angle of the waterproof layer was measured.

[Measurement of Dry Crack Resistance at Early Age]

After the concrete plate was made to have a width of 30 cm and a height of 50 cm (concrete specimen conditions were the same), Examples 1 to 3 and Comparative Examples 1 to 3 of the present invention were formulated in the same manner as the water absorption test specimen and applied to the concrete surface. do. The coated specimen is immediately placed in a wind tunnel tester to allow a constant wind of 3 m / sec for 48 hours, and then the surface state of the cured specimen is observed after 48 hours. At this time, the application area of each specimen was 20 cm wide and 40 cm long.

Evaluation of the surface condition of the cured waterproofing layer is as follows.

◎: Good without crack, ○: Less than 2 hair cracks within 5mm in length

△: less than 10 hair cracks within 5mm in length

▲: 10 to 20 hair cracks with a length of 5 mm or more

X: 20 or more hair cracks 5 mm or more in length generate | occur | produce

[Mortal compressive strength measurement]

Examples 1 to 3 and Comparative Examples 1 to 3 of the present invention were tested according to the test method of KS L 5105. The water mixture used was applied in the same manner as the water absorption test, Comparative Examples 1 to 3 are the results of measuring the compressive strength for cement mortar only.

Through the results of Table 4, the waterproof cement mortar composition of the present invention was superior to the conventional liquid waterproofing agent, it was found that the adhesion strength, length change and crack resistance is excellent.

The waterproof cement mortar made of the composition of the present invention, unlike the waterproofing agent used in the conventional field is mixed with silica and cement adjusted to an appropriate particle size, the physical properties of the mortar itself, namely shrinkage reduction, improved compactness, workability and water retention By using the mortar itself, water resistance can be expressed, and through the parallel use of an appropriate physical property improving agent, the waterproof performance can be significantly improved.

In particular, while the existing cement waterproofing method is applied by coating the cement paste first and finishing with the mortar second, or by repeating the above process, the composition of the present invention is a separate sand formulation or formulation of the drug in the field There is also an effect that the workability and usability are greatly improved since only a fixed amount of water is used without mixing, and only the composition of the present invention is applied.

In the case of the present invention, it is possible to prevent external quality fluctuation factors that may appear in the field compounded product with a uniform composition and a simple construction process, and to obtain a side effect of reducing the occurrence of problems due to construction errors. .

Claims (3)

2 to 6 parts by weight of re-emulsified powdered resin, reduced surface tension of water and 100 parts by weight of waterproof base mortar composition comprising 70 to 130 parts by weight of Portland cement, with respect to 100 parts by weight of silica sand adjusted to a particle size ranging from 1.4 to 0.07 mm. 0.1 to 0.4 parts by weight of surfactant for improving wettability, 0.05 to 0.20 parts by weight of cellulose ethyl-based thickener for viscosity control and water retention enhancement of mortar slurry, and 0.3 to 1.0 parts by weight of higher fatty acid metal salt of calcium stearic acid based on water repellency, Waterproof mortar composition consisting of 0.3 to 0.7 parts by weight of cellulose-based short fibers of 2 mm or less in length. The mortar composition according to claim 1, wherein the reemulsifying powder resin uses ethylene-vinyl chloride-vinyl laurate, ethylene-vinyl acetate or vinyl acetate-vinyl versatate-vinyl laurate. The waterproof mortar composition according to claim 1, wherein the surfactant is a mixture of hydrocarbon and polyglycol or a lower alcohol-alkyl oxide mixture.