MORTAR MIXTURE WHICH REDUCES CRACK FORMATION

Abstract

A mortar mixture reduces crack formation by using microfibers in pool plasters in order to increase flexural and compressive strength. A waterproof fiber reinforced mortar mixture reduces crack formation by increasing the flexural and compressive strength of pool plasters. By means of the fiber reinforced mortar mixture, workmanship errors (water added more than required due to weighing the material wrong, surface finishing, etc.) and adverse effects due to the external environment (extremely hot and/or windy weather) are minimized.

Claims

1. A mortar mixture for use in pool plasters, comprising: water, dry mix comprising white cement/grey cement and sand/aggregate, and polymer fiber.

2. The mortar mixture according to claim 1, comprising at least one polymer fiber selected from a group comprising polyethylene terephthalate, polypropylene, polyester, polyamide, polyaramid, polyethylene naphthalate, natural fibers (cellulosic, glass, basalt), and mixtures thereof.

3. The mortar mixture according to claim 2, comprising polyethylene terephthalate.

4. The mortar mixture according to claim 3, wherein there is finish oil between 0.02%-3% maximum on the PET microfibers.

5. The mortar mixture according to claim 1, wherein the polymer fiber used in the mortar mixture is in a range of 0.01%-3% by volume.

6. The mortar mixture according to claim 2, wherein the polymer fiber used in the mortar mixture is in a range of 0.01%-3% by volume.

7. The mortar mixture according to claim 3, wherein the polymer fiber used in the mortar mixture is in a range of 0.01%-3% by volume.

8. The mortar mixture according to claim 4, wherein the polymer fiber used in the mortar mixture is in a range of 0.01%-3% by volume.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0018] A Mortar Mixture Which Reduces Crack Formation developed in order to fulfill the objectives of the present invention is illustrated in the accompanying figures, in which:

[0019] FIG. 1. Graphical representation showing the bending strength according to the result of the test and analysis carried out by using polyethylene terephthalate (PET) microfiber.

[0020] FIG. 2. Graphical representation showing the compressive strength according to the result of the test and analysis carried out by using polyethylene terephthalate (PET) microfiber.

DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] The mortar mixture developed within the scope of the invention to be used in pool plasters comprises water, dry mix and polymer fiber. The said dry mix comprises white cement/grey cement and sand/aggregate.

[0022] In the mortar mixture of the present invention which reduces the crack formation; at least one polymer fiber selected from a group comprising polyethylene terephthalate, polypropylene, polyester, polyamide, polyaramid, polyethylene naphthalate, natural fibers (cellulosic, glass, basalt), steel fiber and mixtures thereof can be used as polymer fiber. The polymer fiber is preferably polyethylene terephthalate (PET) microfiber.

TABLE-US-00001 TABLE 1 Components of the mortar mixture according to the invention Preferred amount by weight (kg) Water 353 Dry mix 1600 Polymer fiber 0.1, 0.15, 0.2 (depending on the weight of the dry mix)

[0023] PET microfibers are used homogeneously in the mortar mixture. Therefore, cohesion is provided by establishing a bridge in the mortar mixture. The said PET microfibers can be added to the mortar mixture on site or at the packaging stage. The diameter of PET microfibers used in the invention is in the range of 5-35 microns. The fiber use in the mortar mixture is in the range of 0.01%-3% by volume, the specific weight of PET fiber being 1380 kg/m.sup.3, the range of the amount to be used for 1 m.sup.3 of mortar is as follows: [0024] 0.01% fiber ratio->138 gr/m.sup.3 [0025] 3% fiber ratio->41.4 kg/m.sup.3

[0026] The tensile strength of PET microfibers is 300-1200 MPa, the elongation amount of PET microfibers is 5%-35%, their melting temperature is 235-275 C., dtex value is 350-9000 dtex, and the length is preferably 0.5 mm-100 mm. Finish oil on PET microfibers is between 0.02%-3% maximum. Finish oil is a raw material used in the pet fiber production process. Finish oil eliminates the electrostatic force on the fiber. It enables that the fibers do not adhere to each other. Finish oil enables more homogeneous distribution of fibers in the mortar.

[0027] PET microfibers in the mortar mixture are fire resistant. In the mortar mixture, the breaking/spalling among the components is reduced thanks to the PET microfibers. In case of application of the mortar mixture according to the invention, it reduces the amount of rebound between 30%-90%. Apart from the fiber application, applications which provide crack control and strength can also be provided with textile reinforcements. Addition of fibers also minimizes workmanship errors (water added more than required due to weighing the material wrong, surface finishing, etc.) and adverse effects due to the external environment (extremely hot and/or windy weather).

[0028] The data regarding the tests carried out to prove the effectiveness of a mortar mixture according to the present invention which reduces crack formation are given below. The said test and analysis results are presented for information purposes only and do not have any limiting meaning.

[0029] The table below shows the fiber amounts used for 1600 grams of dry mix (white cement and sand) and 353 grams of water; in field conditions, small scale samples were used in studies based on the mortar mixture comprising a dry mix of 100 kg formed of blends and water in ratio of 15%-45% (this range is followed for reasons such as weather conditions, variability of cement-aggregate) of the total dry mix.

TABLE-US-00002 TABLE 2 Experiment and Analysis Results FIBER STUDY WITH POOL PLASTER PET fiber Sample (6 mm) % numbers Bending Compressive Study Dry by weight Spreading and Observation strengths Strength no Water mix of dry mix properties information notes 7.sup.th day 7.sup.th day Reference 353 1600 Maximum 9 pieces Bleeding 8.7 29.2 grams grams spread (25 cm) 4 cm 4 occurred was achieved in cm 16 cm after 16 hits. prism placing in the mold. 1 353 1600 0.1 Maximum 9 pieces Bleeding 8.9 29.3 grams grams spread (25 cm) 4 cm 4 occurred achieved at 15 cm 16 cm after seconds and 25 prism placing in hits. the mold. 2 353 1600 0.15 23 cm spread 9 pieces Bleeding 9.9 30.6 grams grams was achieved in 4 cm 4 was not 15 seconds and cm 16 cm observed. 25 hits. prism 3 353 1600 0.2 22 cm spread 9 pieces Bleeding 10.5 31.8 grams grams was achieved in 4 cm 4 was not 15 seconds and cm 16 cm observed. 25 hits. prism

[0030] With the mortar mixture according to the present invention, as seen in FIG. 1 and FIG. 2, with the use of PET microfiber, the 7.sup.th day bending strength has increased up to 21%, and the compressive strength has increased up to 9% compared to the reference mortar mixture (mortar mixture without PET fiber).