JP6840938B2 - Method for producing hydraulic composition - Google Patents

Description

The present invention relates to a cement mixture, a hydraulic composition, and a method for producing a hydraulic composition.

Concrete (a type of hydraulic composition) is composed of a mixture of cement, aggregates (fine aggregates, coarse aggregates), water, and admixtures. Further, there is also known a washed-out concrete in which an uneven shape (pattern) is provided on the surface by using a setting retarder or the like to enhance the design (see, for example, Patent Document 1). Such washed-out concrete is mainly used for dirt floors, pavements, concourses, and the like.

Japanese Unexamined Patent Publication No. 2012-223932

However, the color of concrete is gray (achromatic) and dark, and it is difficult to enrich the color even if the pattern is formed by washing out as described above.

The present invention has been made in view of such a problem, and a main object thereof is to enrich colors and improve design.

In order to achieve such an object, the method for producing a water-hard composition of the present invention is a mixture of white cement, glass sand having a particle size of 0 to 5 mm as a fine aggregate, coarse aggregate, and water. A mixing step of producing the water-hard composition and a casting step of placing the water-hard composition in a mold on which a sheet imprinted with a curing retarder that delays the curing of the water-hard composition is attached. A demolding step of removing the mold after curing of the water-hardening composition, and a washing step of washing out a portion whose curing has been delayed by the curing retarder using a high-pressure washing machine after the demolding step. If, have a, the demolding step is performed after the compression strength of the hydraulic composition became 12N / mm ² or more, characterized by.
According to the method for producing such a hydraulic composition, the white cement gives a bright impression, and the glass sand is exposed by washing, so that the white cement can be beautiful and colorful. Moreover, the edge of the pattern can be formed neatly.

Further, in order to achieve such an object, the method for producing a water-hard composition of the present invention comprises white cement, only glass sand having a particle size of 0 to 5 mm as a fine aggregate, coarse aggregate, and water. A mixing step of mixing the above to produce a water-hard composition, a casting step of placing the water-hard composition inside the mold, and curing of the water-hard composition on the upper surface of the water-hard composition. After the sheet arranging step of arranging the sheet on which the curing retarder is imprinted, and the demolding step of removing the sheet while removing the mold after curing the water-hard composition, and after the demolding step. , of the upper surface, have a, a washout step of washing out using a high pressure washer sites cured is delayed by the retarders, the demolding step, the compressive strength of the hydraulic composition is 12N / The feature is that it is performed after it becomes ^{mm 2 or more.}
According to the method for producing such a hydraulic composition, the white cement gives a bright impression, and the glass sand is exposed by washing, so that the white cement can be beautiful and colorful. Moreover, the edge of the pattern can be formed neatly.

In the method for producing such a water-hard composition, a sorting step of sieving a second glass sand particle group having a particle size of 2 to 5 mm from a first glass sand particle group having a particle size of 0 to 5 mm and a sieving step are performed. It further has a glass sand mixing step of mixing the first glass sand particle group and the second glass sand particle group at a predetermined ratio, and in the mixing step, it was obtained in the glass sand mixing step. It is desirable to mix the glass sand with the cement and the water.
According to the method for producing such a hydraulic composition, the proportion of large particles of glass sand increases, so that the color can be further emphasized.

According to the present invention, it is possible to enrich the color and improve the design.

1A to 1F are conceptual explanatory views of the concrete manufacturing method of the present embodiment. It is explanatory drawing of the condition such as the compounding of concrete. It is a figure which shows the characteristic comparison of white cement and ordinary Portland cement. It is a figure which shows the characteristic comparison of sand wave G and mountain sand. It is a figure which shows the particle size distribution of a sand wave G (0 to 5 mm). FIG. 6A is a diagram showing the appearance of the concrete of the comparative example, and FIG. 6B is a diagram showing the appearance of the concrete of the present embodiment. 7A to 7H are explanatory views of a modified example of the concrete manufacturing method.

=== Embodiment ===
<Concrete manufacturing method>
1A to 1F are conceptual explanatory views of the concrete manufacturing method of the present embodiment. Here, an example of a manufacturing method in the case of performing the washing process will be described.

First, as shown in FIG. 1A, the sheet 20 is attached to the inside of the pair of formwork 10 (here, one inside). The sheet 20 is provided with a region 20a on which the setting retarder is not imprinted and a region 20b on which the setting retarder is imprinted. The method of attaching the sheet 20 to the mold 10 is not particularly limited, and for example, nails, tackers, double-sided tape and the like can be used.

Next, as shown in FIG. 1B, concrete 1 (here, ready-mixed concrete) is placed inside the pair of formwork 10 and cured. As a result, as shown in FIG. 1C, the hardened portion 1a and the uncured portion 1b are formed on the cast concrete 1. The uncured portion 1b is formed by delaying the curing of the concrete 1 by the setting retarder of the sheet 20.

After the concrete 1 (excluding the uncured portion 1b) is cured, the mold 10 (and the sheet 20) is removed from the mold as shown in FIG. 1D. Then, as shown in FIG. 1E, the uncured portion 1b of the concrete 1 is washed away with water using a high pressure washer 100 (washing step). As a result, as shown in FIG. 1F, the concrete 1 having the wash-out finish pattern applied to the surface is formed. That is, since the portion of the sheet 20 facing the region 20b (the portion of the uncured portion 1b) is slow to condense, the uncured cement or the like is washed away with water during the washing step, and the aggregate (fine bone). Material, coarse aggregate) is exposed on the surface. Therefore, a difference (pattern) in appearance from the portion of the cured portion 1a is formed.

By the way, ordinary concrete is composed of cement, aggregates (fine aggregates, coarse aggregates), water, an admixture and the like, and is dark gray (achromatic color). Sand is used for the fine aggregate. Therefore, even if the pattern is formed by washing out as described above, it is difficult to enrich the color.

Therefore, in the present embodiment, the colors are enriched to improve the design. Specifically, white cement is used as the cement, and glass sand of 5 mm or less (0 to 5 mm) formed of waste glass is used as the fine aggregate.

As a result, in the concrete of the present embodiment, since white cement is used, the appearance becomes brighter, and when the glass sand is exposed to light, the light is reflected by the glass sand, so that the concrete can be made beautiful and colorful. it can.

<< Example >>
Hereinafter, the present invention will be described in more detail with reference to Examples. The present invention is not limited to the following examples.

FIG. 2 is an explanatory diagram of conditions such as mixing of concrete.

(Material used)
The materials used for concrete are cement, fine aggregate, coarse aggregate, admixture (water reducing agent, air volume adjusting material), and water. In this embodiment, the cement and fine aggregate are changed from the usual concrete material.

-Cement As shown in Fig. 2, in this example, white cement (C1) manufactured by Taiheiyo Cement Co., Ltd. was used as the cement. Moreover, as a comparative example, one using ordinary Portland cement (C2) was prepared.

FIG. 3 is a diagram showing a characteristic comparison between white cement and ordinary Portland cement (reference standard).

White cement is a type of Portland cement (white Portland cement), and _{has a low content of ferric oxide (Fe 2} O ₃ ) and magnesium oxide (MgO), which are the coloring components of Portland cement, and has a high degree of whiteness. It is cement. The basic properties of white cement are almost the same as those of ordinary Portland cement.

-About fine aggregate As shown in FIG. 2, in this example, glass sand (trade name: Sandwave G) manufactured by Glass Resourcing Co., Ltd. was used as the fine aggregate. In this embodiment, as will be described later, glass sand (S1) having a particle size of 0 to 5 mm and glass sand (S2) having a particle size of 2 to 5 mm are mixed at a mixing ratio of 7: 3. Further, as a comparative example, one using land sand (S3) produced in Kisarazu, Chiba was produced.

FIG. 4 is a diagram showing a characteristic comparison between sand wave G and mountain sand.

Sandwave G is a recycled material made from 100% glass bottles and glass scraps that have been discarded or landfilled. It has no sharp facets (cleavage surface) and is a safe granulated sand that clears the environmental standards for soil. is there. Further, the sand wave G has less variation in particle size and performance than natural sand, and the change with time is also small. In addition, it has high water permeability and mechanical properties superior to those of mountain sand.

Further, FIG. 5 is a diagram showing a particle size distribution of Sandwave G (0 to 5 mm). The horizontal axis shows the size of the particle size (mm), and the vertical axis shows the weight passing percentage (%).

As shown in FIG. 5, Sandwave G is between the upper and lower limits of the "use limit of sand columns (California specification)" and the "practical range of press-fit sand", respectively, and is a comparison suitable for the two particle sizes. It has a target "coarse" particle size distribution.

(Production method)
In this embodiment, first, sand wave G (glass sand (S1) having a particle size of 0 to 5 mm) was screened to sort glass sand (S2) having a particle size of 2 to 5 mm (corresponding to the sorting step).

Then, the unsieving sand wave G (glass sand (S1) having a particle size of 0 to 5 mm) and the glass sand (S2) obtained by sieving were mixed at a mixing ratio of 7: 3 (corresponding to a predetermined ratio). (Equivalent to the glass sand mixing process). That is, from FIG. 5, since 2 mm or more is 20% in the sand wave G, when the glass sand (S1) is 70% and the glass sand (S2) is 30%, the glass sand of 2 to 5 mm in the mixture of S1 and S2 The ratio is
0.7 × 0.2 + 0.3 × 1.0 = 0.44
(That is, 44%).

By doing so, the proportion of large particles (glass sand) increases, so that the color can be further emphasized (color becomes vivid).

Then, each material was mixed under the compounding conditions (unit amount, etc.) shown in FIG. 2, and kneaded by the kneading method of FIG. 2 (corresponding to the mixing step). That is, as shown in FIG. 2, first, the aggregate and cement were put into the mixer and kneaded for 10 seconds. At this time, in this embodiment, white cement is used as the cement and glass sand of 0 to 5 mm is used as the fine aggregate, so that the cement mixture containing white cement and glass sand of 0 to 5 mm is used. Become. Then, the admixture and water were added to the mixer and kneaded for 60 seconds.

Then, concrete was cast into the mold 10 (including the sheet 20) according to the procedure shown in FIGS. 1A to 1F described above, and after curing, the mold 10 was removed from the mold 10 and further washed out.

It is desirable that the formwork 10 be removed after the strength of the concrete in the hardened portion becomes 12 N / mm ² or more (in the case of the quality test result of FIG. 2, after about 24 hours have passed). By doing so, the edge of the pattern (the boundary between the region Ra and the region Rb, which will be described later) can be neatly formed.

(Evaluation results)
FIG. 6A (upper row) is a diagram showing the appearance of the concrete of the comparative example, and FIG. 6B (lower row) is a diagram showing the appearance of the concrete of the present embodiment. Here, three types of sheets 20 are used, and three types of concrete surface shapes are formed corresponding to the sheets 20. In the figure, the region indicated by Ra is a portion corresponding to the hardened portion 1a of concrete. That is, it is a part that was hardened at the time of demolding. The region indicated by Rb is a portion corresponding to the uncured portion 1b. That is, it is a portion that is uncured at the time of demolding, and the cement or the like is washed away with water during the washing step, and a large amount of aggregate is exposed.

As shown in the figure, the concrete surface of the comparative example (upper) has a slightly dark gray color in the region Ra, and the aggregate such as land sand (S3) is exposed in the region Rb as well, resulting in a dark color. ing.

On the other hand, the surface of the concrete of this embodiment (lower stage) is white of white cement in the region Ra, and glass sand of various colors is exposed in the region Rb. As a result, the appearance is brighter than that of the comparative example, and when the glass sand is exposed to light, the light is reflected by the glass sand, so that the glass sand can be made beautiful and colorful. Therefore, various colors can be expressed and the aesthetic effect on the appearance can be enhanced.

<< Modification example >>
7A to 7H are explanatory views of a modified example of the concrete manufacturing method. In the above-described embodiment, the sheet 20 (condensation retarder) is arranged inside the mold 10, but in this modification, the condensation retarder is arranged in a place other than the mold, as will be described later. ..

First, as shown in FIG. 7A, the formwork 10'is assembled, and concrete 1 (ready-mixed concrete) is placed inside the formwork 10'. However, in this modified example, the sheet provided with the setting retarder is not attached to the mold 10'.

After placing the concrete 1, as shown in FIG. 7B, the upper surface (top surface) is finished with iron 120 or the like. Then, as shown in FIG. 7C, the cloth 22 is arranged on the upper surface while there is breathing water. The cloth 22 is a breathable (easy to release air) mesh-like sheet, and the cloth 22 is imprinted with a setting retarder on the entire surface.

After arranging the cloth 22, as shown in FIG. 7D, the cloth 22 is lightly pressed with a trowel 120 or the like to remove air between the concrete 1 and the cloth 22 for finishing.

After finishing, cure. Since the cloth 22 provided with the setting retarder is arranged, the uncured portion 1b and the cured portion 1a are formed on the concrete 1 as shown in FIG. 7E. In this example, since the setting retarder is imprinted on the entire surface of the cloth 22, the entire upper surface of the concrete 1 is the uncured portion 1b.

Then, after a lapse of a predetermined time (for example, after the compressive strength of the cured portion 1a becomes 12 N / mm ² or more), as shown in FIG. 7F, the mold 10'is demolded and the cloth 22 is peeled off (demolding). Process). Then, as shown in FIG. 7G, the uncured portion 1b is washed away with water using the high pressure washer 100 (washing step). As a result, a washed-out finished surface is formed as shown in FIG. 7H.

In this example, since the setting retarder is imprinted on the entire surface of the cloth 22, the entire upper surface of the concrete 1 is the uncured portion 1b. However, as in the above-described embodiment, the setting retarder is applied to the cloth 22. The uncured portion 1b and the cured portion 1a may be formed on the upper surface by providing the non-imprinted region of. By doing so, a desired pattern can be formed by the washing process.

Further, in this example, the upper surface is pressed with the iron 120 to finish the concrete smoothly, but the present invention is not limited to this. For example, the concrete is given a self-leveling function and finished without pressing. It may be.

=== About other embodiments ===
The above embodiment is for facilitating the understanding of the present invention, and is not for limiting the interpretation of the present invention. It goes without saying that the present invention can be modified and improved without departing from the spirit thereof, and the present invention includes an equivalent thereof. In particular, even the embodiments described below are included in the present invention.

In the above-described embodiment, the case of concrete has been described, but it may be applied to other hydraulic compositions. For example, it may be applied to a mortar containing no coarse aggregate. Also in this case, by using white cement and glass sand having a grain size of 0 to 5 mm, the color can be enriched as in the above-described embodiment.

In the above-described embodiment, the formwork 10 is a plate-shaped member, but the formwork may have any shape. For example, it may be a columnar formwork.

Further, the materials used and the compounding conditions for concrete are not limited to the conditions shown in FIG. For example, the mixing ratio of the glass sand (S1) having a particle size of 0 to 5 mm and the glass sand (S2) having a particle size of 2 to 5 mm may be changed. Alternatively, only glass sand (S1) having a particle size of 0 to 5 mm may be used as the fine aggregate. However, with only glass sand (S2) having a particle size of 2 to 5 mm, the properties of fresh concrete may deteriorate because there are no fine particles. Therefore, it is desirable to use at least glass sand (S1). In addition, as in the above-described embodiment, the color is further emphasized by setting the ratio of the glass sand having a particle size of 2 to 5 mm to 40% or more by mixing the glass sand (S1) and the glass sand (S2). Can be done.

1 Concrete 1a Hardened part 1b Unhardened part 10 Formwork 20 Sheet 20a Area where the setting retarder is not imprinted 20b Area where the setting retarder is imprinted 22 Cloth 100 High pressure washer 120 鏝

Claims (3)

A mixing step of mixing white cement, glass sand having a particle size of 0 to 5 mm as a fine aggregate, coarse aggregate, and water to produce a hydraulic composition.
A casting step of placing the hydraulic composition on a mold to which a sheet imprinted with a curing retarder that delays the curing of the hydraulic composition is attached, and a casting step of placing the hydraulic composition on a mold.
A demolding step of demolding the mold after curing of the hydraulic composition, and
After the demolding step, a washing step of washing out the portion whose curing has been delayed by the curing retarder using a high pressure washer, and
Have a,
A method for producing a hydraulic composition , wherein the demolding step is performed after the compressive strength of the hydraulic composition becomes 12 N / mm ^{2 or more.} A mixing step of mixing white cement, glass sand having a particle size of 0 to 5 mm as a fine aggregate, coarse aggregate, and water to produce a hydraulic composition.
The casting process of placing the hydraulic composition inside the mold, and
A sheet arranging step of arranging a sheet imprinted with a curing retarder that delays the curing of the hydraulic composition on the upper surface of the hydraulic composition, and a sheet arranging step.
After the hydraulic composition is cured, the mold is removed from the mold and the sheet is removed.
After the demolding step, a washing step of washing out the portion of the upper surface whose curing has been delayed by the curing retarder using a high pressure washer, and a washing step.
Have a,
A method for producing a hydraulic composition , wherein the demolding step is performed after the compressive strength of the hydraulic composition becomes 12 N / mm ^{2 or more.} The method for producing a hydraulic composition according to claim 1 or 2.
A sorting step of sieving the second glass sand particle group having a particle size of 2 to 5 mm from the first glass sand particle group having a particle size of 0 to 5 mm.
A glass sand mixing step of mixing the first glass sand particle group that has not been screened and the second glass sand particle group at a predetermined ratio.
In the mixing step, the glass sand obtained in the glass sand mixing step is mixed with the cement and the water.
A method for producing a hydraulic composition.