JP4971761B2 - Cement composition, method for fixing beautiful particles using cement paste - Google Patents

Description

  The present invention relates to a cement composition, a cement paste, and a method for fixing beautiful particles. More particularly, the present invention relates to a cement composition, a cement paste, and a method for fixing beautiful particles, which are useful for a washout-style makeup finishing method for a floor surface.

  Plaster-like means by uniformly spreading epoxy resin or urethane resin adhesive on beautiful particles such as natural cobblestone, marble crushed stone, rounded cobblestone granules, colored glass beads and rounded cobblestone granules The floor makeup finish that was painted in was developed, and it was very popular.

  However, in the above method, the fine finish of the beautiful particles is weak in strength and easy to get dirty, so it was widely used at first, but then declined. As a method for solving such drawbacks, a method described in Patent Document 1 has been developed, which is a method of filling voids of fixed beautiful particles with cement mortar, and the drawbacks of the conventional method are greatly improved. Now, it is rapidly spreading.

By the method described in Patent Document 1, the strength of the fine grain finishing and the ease of soiling are certainly greatly improved. However, in the filling of cement mortar with a strong tendency to thixotropy, a kind of taiko-like finish is perfect, and the appearance will reach a satisfactory level for the time being, but it is a satisfactory improvement in strength. hard.
Japanese Patent Publication No. 7-11178

  The gap filling cement performance further required by the method described in Patent Document 1 is as follows: (a) superior gap filling ability, (b) sag stop that does not flow down with a slight gradient, (c) hardening cement paste It is the reduction of the water separation causing the whiteness of the body and (d) the shrinkage of hardening of the hardened cement which causes the flaking of the hardened cement and the beautiful particles as the embedding base material of the beautiful particles as much as possible.

  Unfortunately, as long as cement paste or mortar is used as it is as a void filler, the above four requirements cannot be satisfied at the same time. As the fluidity of the paste is increased, the gap filling property is greatly improved, but the sag stopping property, water separation property and cure shrinkage property are deteriorated.

  If the cement paste has a flow value as a measure of its fluidity of about 190 mm and is poured into the voids of beautiful particles, the appearance defect of being easily soiled can be finished to a satisfactory level. Is only the appearance of the finished surface, and there are many voids below the surface, which does not improve the overall strength of the finished layer. As will be described in detail later, the gap filling rate when the above-mentioned paste paste is used is only 53%.

  On the other hand, if the amount of kneading water is increased when making the paste and the flow value of the cement paste is increased to about 270 mm to make it soft and kneaded, the void filling rate increases to 99%. However, the sag-stopping property described later, that is, the flow down start inclination is lowered to about 2 degrees, or water separation occurs during the hardening process of the paste. Further, an increase in the amount of kneading water leads to an increase in the curing shrinkage of the cured body.

  The problem caused by the deterioration of drooping is often the case where the floor to be constructed is an inclined surface, and the standard of the ramp that is permitted by Article 26 of the Building Standards Act Construction Order is 1/8, that is, 7.2 degrees. It is set to a gradient, and it is required that the cement paste does not flow down to this gradient, but if the cement paste flows down at this gradient, satisfactory finishing cannot be achieved. In addition, when the cement paste hardens as the flow value increases, there is a problem that the appearance of the hardened finish becomes whitish when water separation occurs, and this problem is the finished appearance when colored cement is used. The value of is greatly reduced.

  Further, when a large curing shrinkage occurs when the cement paste is cured, so-called flesh separation occurs between the cured cement and the beautiful particles, leading to a decrease in the finished appearance and also a decrease in strength. A high-flow-value cement is obtained when a finish filled with a soft-kneaded cement paste with a flow value of about 270 mm is compared with a finish filled with a solid-kneaded cement paste with a flow value of about 190 mm after curing in the atmosphere for 4 weeks. It has been found that the paste filling finish is more prone to meat separation.

  Therefore, the object of the present invention is to fill the above-mentioned four performances required for the cement composition used in the method for fixing beautiful particles, that is, (a) every corner of the void of fixed beautiful particles. Fluidity, (b) Excellent sag-preventing property that does not flow down even at a maximum gradient of 7.2 degrees permitted by Article 26 of the Building Standards Act, ordinance, (c) Curability without water separation, and (d) Small curing shrinkage To provide a cement composition having satisfactory properties, a cement paste, and a method for fixing beautiful particles using these cement pastes.

The above object is achieved by the present invention described below. That is, the present invention provides a cement composition for use in the method of fixing the beautiful particles comprise ultra rapid setting cement or super early strength Portland cement powder, a fluidizing agent powder, and a hardening retarder, JIS R 5201 It provides a cement composition for filling voids between beautiful particles, characterized in that the initial setting time defined in the above is 20 to 90 minutes and the final setting time is 60 to 200 minutes.

In the above cement composition, it is preferably contains sand as aggregate in et.

The present invention also includes (a) a step of bonding beautiful particles having a long diameter of 2 to 10 mm on a substrate with a synthetic resin binder, and (b) a void between the beautiful particles bonded with the synthetic resin binder. In a method for fixing beautiful particles, including a step of filling with paste, and (c) removing the cement paste on the surface of the beautiful particle so that the surface of the beautiful particle is exposed when the cement paste layer is initially set. In the above-mentioned step (b), when filling the voids between the beautiful particles, the blend was dry blended containing a super fast hard cement or super fast strong Portland cement powder, a fluidizing agent powder, and a setting retarder. 100 parts by weight of a cement composition having a setting start time defined by JIS R5201 of 20 to 90 minutes and a setting end time of 60 to 200 minutes, and 20 to 100 parts by weight of water There is provided a method for fixing beautiful particles characterized in that a cement paste having a flow value defined by KASS 15 M103 obtained by kneading of 200 to 260 mm is used .

  According to the present invention, in the implementation of a conventionally known method (Patent Document 1), so-called sag-stopping can be performed by smoothly flowing and filling all corners of the fine particle-finished voids, and does not flow down at the grade of the floor substrate. Provided are a cement composition, a cement paste, and a method for fixing beautiful particles that are excellent in properties and contribute to a significant improvement in finish strength without leaving the beautiful particles even when cured.

Next, the present invention will be described in more detail with reference to preferred embodiments.
The cement composition of the present invention includes cement powder and fluidizing agent powder. The cement powder used here includes ordinary Portland cement, early-strength Portland cement, ultra-high strength Portland cement, moderately hot Portland cement, white cement, blast furnace cement, fly ash cement, expanded cement, lime as lime siliceous cement Examples of the alumina cement include an alumina cement and an ultrafast cement, but the cement powder used in the present invention is not limited to the above examples.

  In the present invention, the cement powder is obtained by mixing a fluidizing agent powder. For example, when the cement powder is a super-hard cement or a super-high strength Portland cement, in addition to a fluidizing agent (water reducing agent), a curing retarder for reducing the setting time that is too fast is blended in an appropriate ratio. Then, the setting start time specified in JIS R 5201 of the blend is adjusted to 20 to 90 minutes, and the setting end time is adjusted to 60 to 200 minutes.

  Commercially available products such as “Jet Cement” (manufactured by Sumitomo Osaka Cement Co., Ltd.) can be used as the above ultra-fast hard cement or ultra-high strength Portland cement. The fluidizing agent (water reducing agent) used in the present invention is a material that acts to reduce the amount of water used to paste cement powder. Reduction of kneading water is the best way to suppress water separation and cure shrinkage during cement paste curing. The smaller the kneading water, the harder the cement paste and the lower the fluidity. Therefore, a fluidizing agent (water reducing agent) is used to reduce the kneading water and maintain the fluidity.

  Fluidizing agents include, for example, β-alkylnaphthalene sodium sulfonate formalin condensate, β-alkyl sodium naphthalene sulfonate / sodium lignin sulfonate formalin, sodium lignin sulfonate, gluconate and polycarboxylic acid One or a mixture of sodium and the like can be mentioned. These fluidizing agents are added at a ratio of 0.01 to 5.0 parts by mass, preferably 0.1 to 2.0 parts by mass with respect to 100 parts by mass of cement, while maintaining necessary fluidity. Sufficient water reduction effect is obtained.

  Since the above-mentioned ultra-fast hard cement or ultra-early strong Portland cement has a setting start time and setting end time that are too fast, the present invention further includes a setting retarder powder. In particular, the cement mortar made of ultrafast cement has a setting start time of 10 minutes and a setting end time of 15 minutes, so that the desired polite finish cannot be achieved. Examples of the retarder include one or a mixture of gluconate, citrate, lignin sulfonate, and saccharide.

  By blending the above-mentioned curing retarder in an amount of 0.01 to 5.0 parts by weight, preferably 0.1 to 2.0 parts by weight, with respect to 100 parts by weight of super fast hard cement or super early strength Portland cement It is possible to delay the setting start time of the cement mixture to 20 to 90 minutes and the setting end time to a practical range of 60 to 200 minutes.

  The cement composition of the present invention is preferably a cement mortar in which 0 to 300 parts by mass, preferably 50 to 250 parts by mass of sand as an aggregate is added to 100 parts by mass of cement. As an aggregate for this purpose, sand having a particle size of 4 to 8 is good, and either sand or river sand may be used, but the sand is superior in the beauty of the finish.

  All of the raw materials of the cement composition of the present invention in the case of using a super fast hard cement or a super fast strong Portland cement are powdery, and can be blended by dry blending each component. The powdered cement composition is excellent in ease of handling in terms of cost in all of packaging, transportation and storage. However, since it cannot be used as it is, it needs to be kneaded with water to form a paste. When the amount of water used is excessive, the obtained paste is excellent in filling properties, but cannot satisfy other required performances, that is, sag-stopping property, water separation in the curing process, and small curing shrinkage. On the other hand, if the amount of water is too small, the filling properties of the paste in the gaps are lowered even if other required performances can be satisfied.

  An appropriate amount of kneading water is 20 to 100 parts by mass based on 100 parts by mass of the cement composition. If it is defined by the fluidity of the kneaded cement paste (JASS 15 M 103), the amount of water will be a flow value of 200 to 260 mm.

  The above is the case where super fast hard cement or super early strength Portland cement powder is used as cement powder, but in the present invention, ordinary or early strength Portland cement, white cement, blast furnace cement or fly ash cement is also used as cement powder. Can do. Commercially available products can be used for ordinary or early-strength Portland cement, white cement, blast furnace cement, or fly ash cement. The fluidizing agent (water reducing agent) used in this case is the same as described above, and the amount used is also the same.

  Since the above-mentioned ordinary or early-strength Portland cement, white cement, blast furnace cement or fly ash cement is too late in setting time and setting time, setting accelerator powder is further blended in the present invention. Cement mortar made of ordinary Portland cement has a setting start time of 3 hours and 40 minutes and a setting end time of 6 hours, which requires a long time for construction and is not economical at all. As the hardening accelerator, sodium carbonate, sodium silicate, sodium aluminate, calcium sulfonates, calcium aluminates, glycerin, triethanolamine, the above ultra-hard cement, ultra-high strength Portland cement or alumina cement is used. do it. For example, ultrafast cement or ultra-high strength Portland cement or alumina cement is used in an amount of 1 to 30 parts by mass, preferably 5 to 20 parts by mass with respect to 100 parts by mass of normal or early-strength Portland cement, white cement, blast furnace cement or fly ash cement. By adding a part and using a hardening accelerator in the same manner as in the previous period, it is possible to promote the setting time of the cement mixture to 20 to 90 minutes and the setting time to a practical range of 60 to 200 minutes. it can.

  Further, ordinary or early-strength Portland cement, white cement, blast furnace cement or fly ash cement is further added with 0 to 300 parts by mass, preferably 50 to 250 parts by mass of sand as an aggregate with respect to 100 parts by mass of cement. Cement mortar is preferred. As an aggregate for this purpose, sand having a particle size of 4 to 8 is good, and either sand or river sand may be used, but the sand is superior in the beauty of the finish. Regarding the blending method of the cement composition of the present invention when ordinary or early-strength Portland cement, white cement, blast furnace cement or fly ash cement is used, and the amount of kneading water used for pasting, the above-mentioned super-fast hard cement or ultra-early strong Portland cement is also used. This is the same as the case of the event.

  The method for fixing beautiful particles according to the present invention includes (a) a step of binding beautiful particles having a long diameter of 2 to 10 mm on a substrate with a synthetic resin binder, and (b) filling a gap between the beautiful particles with cement paste. In the method for fixing beautiful particles, comprising the steps of: (c) removing the cement paste on the surface of the beautiful particles so that the surface of the beautiful particles is exposed when the cement paste layer is initially set. It is characterized by using the cement paste of the present invention as a paste.

  Examples of the base include general promenades, parks, gardens, entrances to the entrances and entrances of the restaurants, plazas on the grounds of buildings such as museums, gymnasiums, and museums, and these bases are decorated. The Further, the beautiful particles are preferably beautiful natural cobblestones, marble crushed stones, cobblestone-like granules with rounded corners, colored glass beads, and cobblestone-like granules with rounded corners. Artificial colored aggregates can also be used. As the size of the beautiful particles, the major axis is in the range of 2 to 10 mm. If the thickness is smaller than this, the essential design value is rapidly reduced, and if it is larger than this range, the workability of spreading on the substrate becomes difficult.

  As the synthetic resin binder, any one that forms a room temperature-curable transparent film can be applied. For example, an epoxy resin composition comprising bisphenol A or F type epoxy resin and polyamine or polythiol, an unsaturated polyester resin, an unsaturated polyester resin composition comprising a vinyl monomer such as ethylene and a polymerization initiator, polyisocyanate and polyol or polyester A urethane resin composition composed of a urethane prepolymer synthesized from the above and a polyamine or polyol as a curing agent, or a urethane resin composition composed of an acrylic polyol and a polyisocyanate are all applicable.

  In the method of the present invention, the coating composition comprising the beautiful particles and the synthetic resin binder is applied to the surface of the substrate, and after it is cured, the second step is performed in the voids between the beautiful particles. The cement paste of the present invention is filled. The cement paste should be applied to the floor after pouring and ironing. After painting the wall with a scissors, apply the iron again. The bag used here is preferably made of rubber or soft plastic. Such wrinkles are preferable because the surface of the paste layer becomes lower than the beautiful particles and the exposure of the beautiful particles increases because the surface of the paste layer is deformed along the particles on the surface of the beautiful particles when the cement paste is applied.

  The important point here is that the beautiful particle layer in the first step is a hardened body with appropriate voids. Even with a small amount, it has a stable finish that is not unsightly. Next, with ironing only with rubber candy, the exposure ratio of beautiful particles is insufficient, and the design of the washing-out style is lacking, so when the initial setting of the cement paste after ironing starts, for example, brushing with a scouring polisher I do. After stopping according to the degree of exposure of the target beautiful particles, the excess cement paste is collected by a dust collector, and further polished by a polisher with a waste cloth and a sponge.

  The cement paste used above has a setting time of 20 to 90 minutes specified by JIS R 5201, a setting time of 60 to 200 minutes, and a flow value specified by JASS 15 M 103. Since the thickness is 200 to 260 mm, the problems (a) to (d) of the present invention are improved, and there is an advantage that a beautiful and strong decoration can be applied without requiring a long time.

  In addition, the measurement of the filling rate of the cement paste in this invention was performed as follows. A coating composition in which 5 parts by mass of urethane resin adhesive is uniformly coated on 100 parts by mass of beautiful particles having a major axis of 10 mm (hereinafter referred to as “beautiful particle rejuvenating coating composition”) is made of a hammer and has a bottom surface of 100 × 100 mm. Then, it was applied to a container in which a release paper was affixed to the bottom surface of a thin and transparent container having a height of 10 mm by using an adhesive tape to form beautiful particles and cured, and then subjected to measurement.

  The voids of the beautiful particles were filled with cement paste used for measurement in the same manner as in the actual construction, and were completely cured. When cured, it was removed from the transparent container and the back side was color-copied and used as a sample for determining the filling rate. Using the area calculation system “Hyper Area Kun” (manufactured by Milx Co., Ltd.), the area of the unfilled portion was determined, and the percentage of the area that required filling was defined as the filling rate. Here, the area that needs to be filled is an area obtained by removing the dripping of the beautiful particles and the synthetic resin adhesive from the entire bottom surface area. What is actually needed is a three-dimensional void filling factor, but unfortunately has no means of measuring it. Inevitably, the two-dimensional filling of the bottom surface was substituted, but there would be no great mistake in thinking that it would be a measure of the filling ratio of the three-dimensional gap.

  Moreover, the measurement of the dripping stop property of the cement paste in the present invention was performed as follows. On a slate plate having a thickness of 6 mm and a size of 220 × 290 mm, the beautiful particle-like coating composition was applied to a thickness of 10 mm using a gold hammer to form a beautiful particle-like layer. In the following, this base plate is used for various void filling tests. Therefore, hereinafter, it will be simply referred to as a beautiful particle generating void filling test plate.

  After sufficiently curing, it was subjected to measurement of the sag stopability of the cement paste. First, place cement paste on a horizontally placed beautiful particle-generating void filling test plate, and evenly smooth until the surface beautiful particles are covered with a single layer of skin with a sponge scissors. The short side is slowly lifted, the angle at which the cement composition begins to flow down is determined, and that angle is defined as sagging.

Hereinafter, the present invention will be described more specifically with reference to examples and comparative examples. In the text, “part” or “%” is based on mass.
[Example 1]
100 parts of super-hard cement (trade name: jet cement, manufactured by Sumitomo Osaka Cement Co., Ltd.), 100 parts of No. 7 cinnabar sand, 0.6 parts of sodium gluconate (manufactured by Lion Corporation) as a curing retarder, as a fluidizing agent 0.8 parts of sodium polycarboxylate (trade name: Politi MX-300, manufactured by Lion Corporation) was dry blended to obtain a powdery cement composition of Formulation I. 100 parts of this powdery cement composition was uniformly kneaded with 28 parts of fresh water to form beautiful particles to obtain a void-filled cement paste.

  The cement paste had an initial setting time of 45 minutes and an end time of 2 hours 30 minutes. Compared to other materials with limited pot life, the pot life is sufficiently long without any problems. In addition, the flow value is 248 mm, the sag stop measured by the above method, that is, the flow start inclination is 9 degrees, and the maximum gradient based on the slope defined by Article 26 of the Building Standard Act Construction Ordinance 7. It is well above 2 degrees. Further, the void filling rate measured by the above method was 98%, which is one step for complete filling, but it was a practically sufficient level.

  After 80 minutes, which exceeded the initial setting time, a beautiful particle formation test board used for measuring the sag stop was wiped with a sponge soaked with water, and the beautiful cement particles were exposed and cured. Then, it was used for evaluation of the finishing level. The finish was almost the same as the so-called washout finish, and the evaluation rank was positioned as “good”. These results are shown in Table 1 together with other examples and comparative examples.

[Example 2]
100 parts of jet cement, 0.1 part of sodium citrate as a set retarder, 0.5 part of sodium gluconate as a set retarder and a fluidizing agent were dry blended to obtain a powdered cement composition of Formulation II. 100 parts of this powdery cement composition was uniformly kneaded with 56 parts of fresh water to form beautiful particles to obtain a void-filled cement paste. Since no aggregate is used, the amount of kneading water to give the same level of fluidity as in Example 1 far exceeds that in Example 1.

  As for the filling performance of this filled cement paste, the setting start time is 55 minutes and the closing time is 2 hours and 40 minutes. As in Example 1, there is no problem in usability. Further, the flow value is 208 mm, the flow start inclination is 15 degrees far exceeding that of Example 1, and there is no concern about the construction exceeding that of Example 1. The gap filling rate is 98%, which is one step toward complete filling, but has reached a practically sufficient level. The finish level evaluated in the same manner as in Example 1 was “good” and the water ratio was high, so there was a concern about the appearance of the finish that was significantly lower than Example 1, but it seems that the finish was over. . These results are compared in Table 1 together with other examples and comparative examples.

[Example 3]
100 parts of jet cement, 100 parts of No. 7 cinnabar sand, 0.6 parts of sodium gluconate as curing retarder, β-alkylnaphthalene sodium sulfonate / sodium lignin sulfonate as a fluidizing agent (β-ANS) / LS) (trade name: GF-700, manufactured by Pozoris Co., Ltd.) 0.8 parts was dry blended to obtain a powdered cement composition of Formulation IV. 100 parts of this powdery cement composition was uniformly kneaded with 28 parts of fresh water to form beautiful particles to obtain a void-filled cement paste.

  The filling performance of this filled cement paste has a setting start time of 1 hour 15 minutes and a setting time of 2 hours, and there is no problem in usability. The flow value is 236 mm, and the flow start inclination is 11 degrees far exceeding that of Example 1, and there is no concern for the construction. The gap filling rate is 98%, which is one step toward complete filling, but has reached a practically sufficient level. The finish level was “good”. These results are shown in Table 1 together with other examples and comparative examples.

[Example 4]
85 parts of ordinary Portland cement, 15 parts of alumina cement as a hardening accelerator, 100 parts of No. 7 cinnabar, 0.4 part of sodium gluconate as a hardening regulator and sodium β-alkylnaphthalene sulfonate / lignin sulfone as a fluidizing agent 0.7 parts of sodium acid formalin cocondensate (β-ANS / LS) was dry blended to obtain a powdered cement composition of Formulation V. 100 parts of this powdery cement composition was uniformly kneaded with 30 parts of fresh water to form beautiful particles to obtain a void-filled cement paste.

  The filling performance of this filled cement paste has a setting time of 25 minutes and a setting time of 3 hours. The flow value is 234 mm, the flow down start inclination is 11 degrees as in Example 3, and there is no concern about the construction. The gap filling rate is 98%, which is one step toward complete filling, but has reached a practically sufficient level. The finish level was “good”. These results are shown in Table 1 together with other examples and comparative examples.

[Example 5]
92 parts of white cement, 8 parts of calcium sulfonates as hardening accelerator, 100 parts of No. 7 cinnabar, 3 parts of coloring pigment, 0.4 part of sodium gluconate as a curing regulator and polycarboxylic acid as a fluidizing agent 0.9 parts of sodium was dry blended to obtain a powdered cement composition of Formulation VI. 100 parts of this powdery cement composition was uniformly kneaded with 35 parts of fresh water to form beautiful particles to form a void-filled cement paste.

  The filling performance of this filled cement paste has a setting time of 40 minutes and a closing time of 1 hour and 15 minutes. The flow value is 240 mm, and the flow start inclination is 10 degrees, so there is no concern about the construction. The gap filling rate is 98%, which is one step toward complete filling, but has reached a practically sufficient level. Although there was a concern that the colored appearance would be whitish, it had a hue that attracted beautiful particles, and the finished level was “good”. These results are shown in Table 1 together with other examples and comparative examples.

[Comparative Example 1]
The powdery cement composition of Formulation I was uniformly kneaded with 35 parts of fresh water, which was considerably higher than that of Example 1, and a beautiful particle was produced as a void-filled cement paste. The filling performance of this filled cement paste is that the setting time is 55 minutes and the setting time is 4 hours, and the closing time is significantly delayed as compared with Example 1. The flow value is 273 mm, much higher than Example 1. The starting slope is 2 degrees, which is well below the maximum slope of 7.2 degrees on the ramp reference. The void filling rate is 99%, but the finished level is “bad”. This result is far from the so-called washout cosmetic finish. This is because the appropriate flow value of Example 1 was excessively increased. These results are shown in Table 1 together with other examples and comparative examples.

[Comparative Example 2]
The powdery cement composition of Formulation I was uniformly kneaded with 23 parts of fresh water, which was considerably lower than that of Example 1, to produce a beautiful particle, thereby obtaining a void-filled cement paste. The filling performance of this filled cement paste has a setting start time of 35 minutes and a closing time of 1 hour and 30 minutes. The closing time is significantly faster than that of Example 1, but there is no problem in usability. The flow value is 188 mm, which is much lower than Example 1. The flow starting gradient is 15 degrees, the void filling rate is 53%, and the finishing level is “good”. In Comparative Example 2, since the flow rate is considerably lower than the appropriate flow value of Example 1, the flow start inclination is greatly improved and the evaluation of the finished level is good, but the filling rate of the beautiful particle generating voids is greatly reduced. It must be judged that the filling performance is inappropriate. These results are shown in Table 1 together with other examples and comparative examples.

[Comparative Example 3]
100 parts of jet cement, 0.5 part of sodium citrate as a set retarder, 0.5 part of sodium gluconate as a set retarder and a fluidizing agent were dry blended to obtain a powdered cement composition of Formulation III. 100 parts of this powdery cement composition was uniformly kneaded with 70 parts of fresh water to form beautiful particles to obtain a void-filled cement paste. The amount of kneading water is considerably higher than that of Example 2. The filling performance of this filled cement paste is that the setting start time is 2 hours and 40 minutes, the closing time is 6 hours or more, the flow value is 280 mm, the flow starting gradient is 2 degrees, the void filling rate is 100%, and the finish level is “poor”. There was a problem with too high flow values due to the use of kneaded water. These results are compared in Table 1 together with other examples and comparative examples.

  According to the present invention, in the implementation of a conventionally known method (Patent Document 1), so-called sag-stopping can be performed by smoothly flowing and filling all corners of the fine particle-finished voids, and does not flow down at the grade of the floor substrate. Provided are a cement composition, a cement paste, and a method for fixing beautiful particles that are excellent in properties and do not leave the beautiful particles when cured and contribute to a significant improvement in finish strength.

Claims (5)

(A) a step of binding beautiful particles having a major axis of 2 to 10 mm on a substrate with a synthetic resin binder, and (b) a step of filling a gap between the beautiful particles bonded with the synthetic resin binder with a cement paste, (C) In the method for fixing beautiful particles, including the step of removing the cement paste on the surface so that the surface of the beautiful particles is exposed when the cement paste layer is initially agglomerated,
In the step (b), when the voids between the beautiful particles are filled, JIS, which is a dry blend containing an ultrafast hard cement or an ultrahigh strength Portland cement powder, a fluidizing agent powder, and a setting retarder. JASS 15 formed by kneading 100 parts by mass of a cement composition having a setting start time defined by R5201 of 20 to 90 minutes and a setting end time of 60 to 200 minutes, and 20 to 100 parts by weight of water. A method for fixing beautiful particles, wherein a cement paste having a flow value defined by M103 of 200 to 260 mm is used . The said cement composition contains 0.01-5.0 mass parts of said fluidizing agents with respect to 100 mass parts of said cement, and also contains 0.01-5.0 mass parts of said hardening retarders. The fixing method of the beautiful particle as described in 4. The method for fixing beautiful particles according to claim 1, wherein the cement composition further contains sand as an aggregate . A cement composition for use in the method of fixing the aesthetic particles according to any one of claims 1 to 3, and ultra-fast curing cement or ultra-high early strength Portland cement powder, a fluidizing agent powder and, retarder A cement composition for filling voids between beautiful particles, characterized in that the initial setting time defined by JIS R 5201 is 20 to 90 minutes and the final setting time is 60 to 200 minutes.   The cement composition according to claim 4, further comprising sand as an aggregate.