JP2009180021A - Gap filling material for use in weed growth prevention method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a gap filling material for use in a weed growth prevention method, which is to be filled in a narrow filling groove on a dry filling basis, proof against clogging of a nozzle, excellent in perviousness when water is sprinkled thereto, proof against formation of uneven parts in a hardened material, and excellent in long stability. <P>SOLUTION: In preparation of the gap filling material, cement and sand are mixed at a ratio of about 1:3, and a drying shrinkage diminishing agent of about 1.5 wt% and an expanding material of about 3.0 wt% are blended in the cement. Further a high performance water reducing agent, an adhesive, etc. are mixed therein as needed. The resultant mixed material is filled into a JP funnel by squeezing and blocking a lower end thereof, and thereafter the total amount of the mixed material is discharged as it is by opening the lower end of the JP funnel. Alternatively a side surface of the JP funnel having the mixed material filled therein is tapped once by a mallet, and then the total amount is discharged. Further mix proportion is adjusted such that when the material is filled in an ordinary 500 ml beaker to the amount of 200 ml and then water is poured from above, a time necessary for the water to be distributed to the entire material is set to 5 min or less. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention is, for example, a dry hydraulic gap used to prevent weeds from entering and generating gaps or cracks between asphalt pavement surfaces and concrete, such as around the curb of the sidewalk or near the median strip. It relates to a filler.

  One important issue in road maintenance is the problem of weeding.

  Weeds that occur in the gaps and cracks between asphalt pavement and concrete, such as around the curb of the sidewalk and in the vicinity of the median strip, can interfere with traffic and can cause accidents due to poor visibility.

  In addition, even if the road is improved, weeds generated in such gaps and cracks immediately grow and hinder the maintenance of the landscape. It also leads to devastation.

  Furthermore, weeding work must be carried out regularly every year, and the costs associated with maintenance are enormous. In addition, the use of herbicides when weeding causes environmental problems.

  For such a problem, for example, in Patent Document 1 and Patent Document 2, what is called a weedproof mat or a weed suppression sheet is pasted in a gap or a crack to prevent the generation and growth of weed from the gap. Is described.

  Patent Document 3 discloses a pavement herbicidal structure in which a gap herbicidal material made of a synthetic resin that has a paste or plasticity at room temperature and is naturally cured by contact with air is applied to the pavement and pressed against it. Are listed.

  In Patent Document 4, weeds and soil that have grown in the gaps between the curb block of the sidewalk and the asphalt pavement are removed, the gaps are washed with water, and then the entire gap is filled with non-shrinkable mortar. The weed growth prevention method is described.

  In Patent Document 5, for the same purpose, weeds that grow from the gaps are removed, or roots are removed, and impurities such as filled earth and sand and dust are removed. If necessary, mortar is provided in the gaps. Step of filling, step of curing with curing tape on both sides across the gap, step of applying, spraying or spraying adhesive to the gap, applying, spraying or spraying urethane resin to the adhesive A step of forming a urethane resin layer, a step of applying, spraying or spraying a coating material onto the urethane resin layer, a step of applying an anti-slip treatment on the coating material, if necessary, and a curing tape after drying The construction method which consists of the process of removing is described.

  Furthermore, Non-Patent Document 1 describes a construction method for preventing the invasion and generation of weeds called “Glass Rock Construction Method” developed by the inventors.

  This "Glass Rock Method" also generally removes weeds that grow from gaps and cracks from the roots using a cutter / high pressure washer, and at the same time cleans the earth and sand and fills with filler. In this way, weeds are prevented from entering and occurring, and more specifically, include the following steps.

(1) Cutter (filling groove processing)
Use a cutter to remove the weed roots in the gaps between the pavement and the structures and cracks.
In addition, in a narrow portion of the filling groove, it is cut by about 5 mm to 30 mm in width depending on the state of asphalt or the like, and a space for filling the filling material is secured (the dimensions of the filling groove are 40 mm in depth and 5 mm in width as a reference. Work while checking the dimensions.)

(2) Cleaning work (filling groove cleaning)
Wash the soil and pavement in the filling ditch using a high-pressure washing machine, and wash away the cut weed roots and seeds at the same time. Weed roots are removed with human power or a cutter.)

(3) Filling process Filling the groove with cement-based filler, which is a mixture of powder and granules, using a filling machine (watering at this time is used to wash away mud and dirt on the side of the groove. Watering.)
After leveling the filler with a brush or the like, water is sprayed about once or twice with a sprayer (the watering at this time is watering for curing the hydraulic filler).

(4) Completion Finally, clean dirt and sand on the pavement surface.

Japanese Patent No. 3826327 JP 2002-154912 A Japanese Patent Laid-Open No. 08-027575 JP 11-081264 A Japanese Patent No. 4007369 “What is Glass Rock Method?”, [Online], Glass Rock Method Study Group, [searched on January 15, 2008], Internet <URL: http://www.grasslock.com/b02.html>

  The present invention is mainly intended to improve the filler in the above-mentioned “Glass Rock Method” (however, it is not limited to use in the “Glass Rock Method”), but powders and granules. In order to fill the filling groove with a depth of about 40 mm and a width of about 5 mm, it is necessary to fill the filler from the tip of the nozzle of about 3 to 5 mm. There is a problem that the nature is bad.

  In addition, it is necessary that the sprinkled water penetrates quickly and uniformly into the filler filled in the narrow filling groove, the solidification of the portion where the water has not penetrated is insufficient, the strength of the cured body, If unevenness occurs in quality, cracks and the like may still occur, and weeds may enter the area.

  Furthermore, if the drying shrinkage is large even after curing, cracks occur or the cured product is peeled off, causing weeds to enter.

  The present invention is intended to solve the above-described problems with respect to the conventional gap fillers for preventing weed generation, and in filling a narrow filling groove in a dry manner, nozzle clogging is unlikely to occur and water spraying is performed. It is an object of the present invention to provide a gap filler for preventing weed generation that is excellent in water permeability due to the above, hardly causes unevenness in a cured product, and has excellent long-term stability.

  The gap filler for weed generation prevention construction method according to claim 1 of the present application is a dry hydraulic gap filler for prevention of weed occurrence construction method containing at least cement, a drying shrinkage reducing agent, and sand, The weight ratio of the sand is 1: 2 to 1: 5.

  In the present invention, with respect to the gap filler for weed generation prevention construction method, in particular, the dry shrinkage reducing agent is important in filling the filler in a narrow gap from a thin nozzle and smoothly promoting the hydration reaction after filling. I am doing.

  That is, from the experimental results to be described later, it was confirmed that the water absorption performance of the filler was significantly improved by adding the drying shrinkage reducing agent in addition to the original effect of suppressing the drying shrinkage.

  When the weight ratio of cement to the sand (cement sand ratio) is less than 1: 5, the cement is too little and curing may be insufficient. On the other hand, if the formulation exceeds 1: 2, the amount of cement is too much and the amount of fine particles increases, so that the water absorption performance is lowered and there is a possibility of causing poor curing, making it unsuitable as a gap filler.

  Claim 2 is a gap filler for weed generation prevention method according to claim 1, wherein the drying shrinkage reducing agent is a shrinkage reducing agent mainly composed of a lower alcohol alkylene oxide adduct, The case where 0.5 to 4.0% by weight is mixed is limited.

  As described above, in the present invention, the effect of improving the water absorption performance by the dry shrinkage reducing agent is also expected. However, for the purpose of reducing the dry shrinkage, if the addition rate is less than 0.5% by weight, the long-term shrinkage effect is weakened. Therefore, if the addition rate exceeds 4.0% by weight, the material cost increases and the problem of nozzle clogging in field construction may occur.

  As a commercial item, for example, trade name “Pacific Tetra Guard PW” of Taiheiyo Material Co., Ltd. can be used.

  Claim 3 is a gap filler for weed generation prevention construction method according to claim 1 or 2, wherein the sand is No. 5 dredged sand, or a combination of No. 4 dredged sand and No. 6 dredged sand, or No. 5 dredged sand and No. 6 dredged sand. A combination or a combination of No. 4 cinnabar, No. 5 cinnabar and No. 6 cinnabar is used.

  In the combination of No. 5 dredged sand, No. 4 dredged sand and No. 6 dredged sand, or No. 5 dredged sand and No. 6 dredged sand, or No. 4 dredged sand, No. 5 dredged sand and No. 6 dredged sand, a JP funnel described later was used. In the flow test, there was no blockage and smooth flow was confirmed, and it is considered that the problem of nozzle clogging in field construction does not occur.

  According to a fourth aspect of the present invention, in the gap filler for the weed generation prevention method according to the first to third aspects, a lime-based expansion material is further mixed.

  Lime-based or gypsum-based expandable materials are used to give expansibility even in conventional fillers, but if there are too many expandable materials, the strength is difficult, and if they are small, they will expand once and then go to the shrink side and crack. Since it may cause the weeds to invade or peel off, it is desirable to mix approximately 3.0 to 9.0% by weight with respect to the cement.

  As a commercially available product, for example, trade name “Pacific Expan (for structure)” of Taiheiyo Material Co., Ltd. can be used.

  According to a fifth aspect of the present invention, in the gap filler for the weed generation prevention method according to the first to fourth aspects, a vinyl acetate resin-based adhesive is further mixed.

  The adhesive is also used in conventional fillers in the form of powder to increase the adhesive force, and can be blended as necessary.

  The gap filler for weed generation prevention method according to claim 6 of the present application includes at least cement, a drying shrinkage reducing agent, and sand, and if necessary, further one of lime-based expansion material, adhesive, and aluminum powder. This is a dry-type gap filler for preventing weed generation by mixing seeds or more. Fill the JP funnel with the lower end of the JP funnel, and then open the lower end of the JP funnel to discharge the entire amount. Or when the side of the JP funnel is struck once with a wooden mallet from the filled state and the whole amount flows out, and up to 200 ml of material is poured into a normal 500 ml beaker, and water is poured from above, It is characterized by blending so that the time until water reaches the whole material is within 5 minutes.

  Claim 6 defines the gap filler for weed generation prevention construction method in terms of properties, but under the conditions specified in claims 1-5, cement such as ordinary Portland cement and No. 5 cinnabar About 1 to 2 to 5 ratio of sand having a particle size of about the same or a combination thereof is blended, and about 0.5 to 4.0% by weight of the drying shrinkage reducing agent is mixed with the cement. If necessary, it can be prepared by further blending a lime-based expansion material, a high-performance water reducing agent, an adhesive, aluminum powder, or the like.

  If the gap filling material of the present invention is used in the weed generation prevention method, nozzle clogging is less likely to occur in the dry filling of narrow filling grooves, and the operation can be performed smoothly.

  In addition, it has excellent water permeability due to water sprinkling, etc., and there is almost no problem with cracking and peeling due to shrinkage after curing. Crossing can be suppressed.

  The method of using the gap filler for the weed generation prevention method of the present invention is basically the same as in the case of the “glass lock method” described in the background section, and (1) Cutter method (filling groove processing) , (2) Cleaning work (filling groove cleaning), (3) Filling work, (4) Completion process.

  In consideration of economic efficiency, the best blending of the gap filler is blended with ordinary Portland cement and sand having a particle size of about No. 5 cinnabar or a combination thereof in a ratio of about 1: 3, A drying shrinkage reducing agent (for example, Taiheiyo Material Co., Ltd., trade name “Pacific Tetragard PW”) made mainly of a lower alcohol alkylene oxide adduct is mixed with ordinary Portland cement at about 1.5% by weight. In addition, a lime-based expansion material (for example, trade name “Pacific Expan (for structural use)” of Taiheiyo Material Co., Ltd.) is mixed with ordinary Portland cement at about 3.0% by weight.

  If necessary, a high-performance water reducing agent, a vinyl acetate resin adhesive, aluminum powder, and the like may be further blended.

  In addition, in terms of properties, the lower end of the JP funnel is filled into the JP funnel with the mixed material, and then the lower end of the JP funnel is opened and the entire amount flows out. When the material is poured into a normal 500 ml beaker and put up to 200 ml, and water is poured from above, it takes less than 5 minutes for the water to reach the whole material. Adjust the formulation so that

  Hereinafter, an experiment conducted in developing the present invention will be described.

  Table 1 shows the materials used in the experiment.

* Tetra Guard: Taiheiyo Material Co., Ltd. “Pacific Tetra Guard PW”
* Expan: Taiheiyo Materials Co., Ltd. “Pacific Expan (for structure)”

(1) Experiment 1
(1) -1 Blending First, as an experiment for imparting expansibility, blending of the current product developed for the “Glass Rock Method” is blended 1, and without adding a drying shrinkage reducing agent, the cement sand ratio (C : 3 levels with changed S), 3 levels with changed addition rate of lime-based expansion material (EX), 2 levels with or without adhesive (B), aluminum powder (AL) as a component that exerts expansion effect The experiment was conducted with a total of 11 formulations in Table 2 combining the three levels added.

  Here, the amount of water was about 20% in the proportion of the powder in all the blends. Further, only the strength test was set to 16%, and the mortar was adjusted by hand kneading to prepare a specimen.

(1) -2 Test items The test items are as follows.

(Expansion coefficient test)
This was performed according to JSCE-F 522. However, the measurement was not a volume change but a length change.

[Compression test]
This was performed according to JIS-A 1108.

[Angle of repose]
The angle was determined from the height and width when filled in a cone having a height of 40 mm and a width of 50 mm and withdrawing.

(1) -3 Test results The results of the expansion coefficient test are shown in FIG.

  From the test results, the blends 9, 10 and 11 to which aluminum powder was added, the expansion material 6% with adhesive, 9% blend 7, blend 8 and the cement sand ratio C: S = 1: 3. In Formulation 2, the expansion was larger than Formulation 1 as the current product.

  Moreover, since the suction | inhalation was the best among three levels about the thing of 1: 3 by the change of cement sand ratio C: S, the below-mentioned experiment 2 and 3 were performed by cement sand ratio C: S = 1: 3. .

  The results of the compressive strength test are shown in FIGS.

  From the test results, it was found that an increase in strength can be expected by changing the cement sand ratio C: S. Moreover, since the use of aluminum powder greatly reduces the strength, it has been found that it is necessary to optimize the amount used.

  Next, Table 3 shows the measurement results of the angle of repose. However, this test was conducted only for Formulation 1, Formulation 2, and Formulation 3 in which the cement sand ratio C: S, which is considered to have a great influence on the angle of repose, was changed.

  From the test results, it was found that the angles were almost the same. For this reason, it seems that there is no significant change in workability.

(2) Experiment 2
(2) -1 Formulation Based on the results of Experiment 1, next, aiming to improve water absorption performance, examined the effect of water absorption performance with changes in the amount of drying shrinkage reducing agent (TG) and high performance water reducing agent (SP) added. did.

  The materials used are as shown in Table 1, and the formulations used are shown in Table 4.

The drying shrinkage reducing agent (TG) has the effect of reducing the surface tension of water, and was added in this test in anticipation of shrinkage suppression and water absorption performance of the cured sample.
The expansion material (EX) was used not only to suppress the shrinkage but also to expect a large expansion performance.

(2) -2 Test items The test items are as follows.

(Expansion coefficient test)
This was performed according to JSCE-F 522.
[Suction test]
The powder suction test was performed as follows.
Into a 500 ml beaker, add up to 200 ml of material. Then pour water over the material and start timing from the water injection. Measure the time for water to reach the entire material visually.

(2) -3 Test results The results of the expansion coefficient test are shown in FIG.

Except for Formulation 3 and Formulation 5, the expansion rate was about 2 to 4%.
Too much swelling is considered less appropriate because the material filled into the gap and hardened can push out the surrounding asphalt. For this reason, it is considered preferable to have a composition that gives an expansion rate of about 3%.

  Next, Table 5 shows the measurement results of the time required for moisture to reach the materials in the beaker.

  The current premix product (comparative formulation) under the same test conditions required 15 minutes.

  On the other hand, when the drying shrinkage reducing agent (TG) was added, the water absorption performance was remarkably improved, and the result was that the sample was distributed to the sample in about half the time. Further, the cement sand ratio C: S is considered to be generally higher in water absorption performance in the case of 1: 3 compared to 1: 4.

(3) Experiment 3
(3) -1 Formulation Based on the result of Experiment 2, the experiment was conducted with sand having a single particle size in order to further improve the water absorption performance. In addition, the flow characteristics from the nozzle tip during construction were also evaluated.

  The materials used are as shown in Table 1. The experiment was conducted by changing the use composition to the composition 1 in Table 4 and changing the sand from S in Table 1 to S4, S5, and S6 and combinations thereof.

(3) -2 Test items The test items are as follows.

[Suction test]
The powder suction test was performed as follows.
Into a 500 ml beaker, add up to 200 ml of material. Then pour water over the material and start timing from the water injection. Measure the time for water to reach the entire material visually.

(Flow test)
The flow-down test was performed as follows.
Fill the JP funnel with material by pressing the lower end of the JP funnel, and open the lower end when filling is complete. If the JP funnel is clogged, tap the side of the JP funnel with a mallet and measure the time until all the material comes out.

(3) -3 Test results Table 6 shows the test results.

  As shown in the test results of Table 6, the suction time could be improved to about 1/6 of the current product (comparative example) in all the formulations. Moreover, it was confirmed that it is a combination of No. 5, No. 4 + 6, and No. 4 + No. 5 + 6 that has the workability equivalent to the current product.

6 is a graph of the expansion coefficient test result of Experiment 1. It is a graph of the result (composition 1-3) of the compressive strength test of Experiment 1. It is a graph of the result (composition 4-8) of the compressive strength test of Experiment 1. It is a graph of the result (composition 9-11) of the compressive strength test of Experiment 1. It is a graph of the expansion coefficient test result of Experiment 2.

Claims (6)

  A gap filler for dry hydraulic weed generation prevention construction method containing at least cement, a drying shrinkage reducing agent, and sand, wherein the weight ratio of the cement to the sand is 1: 2 to 1: 5. Characteristic gap filler for preventing weed generation.   The drying shrinkage reducing agent is a shrinkage reducing agent having a lower alcohol alkylene oxide adduct as a main component, and is mixed in an amount of 0.5 to 4.0% by weight with respect to the cement. Item 1. A gap filler for preventing weed generation according to Item 1.   The sand is characterized by using No. 5 dredged sand, a combination of No. 4 dredged sand and No. 6 dredged sand, a combination of No. 5 dredged sand and No. 6 dredged sand, or a combination of No. 4 dredged sand, No. 5 dredged sand and No. 6 dredged sand. The gap filler for weed generation prevention construction method according to claim 1 or 2.   Furthermore, the lime type | system | group or a gypsum type | system | group expansion | swelling material is mixed, The gap filler for weed generation prevention construction methods in any one of Claims 1-3 characterized by the above-mentioned.   Furthermore, the vinyl acetate resin adhesive is mixed, The gap filler for weed generation prevention construction methods in any one of Claims 1-4 characterized by the above-mentioned. A gap filler for dry weed generation prevention method comprising at least cement, a drying shrinkage reducing agent, and sand, and further mixing one or more of lime-based expansion material, adhesive, and aluminum powder as necessary. The mixed material is filled into the JP funnel by pressing the lower end of the JP funnel, and then the lower end of the JP funnel is opened and the entire amount is discharged as it is, or the side of the JP funnel is once washed with a mallet. When the material is poured up to 200 ml in a normal 500 ml beaker and water is poured from above, the time until the water reaches the whole material is within 5 minutes. A gap filler for preventing weeds from being produced, characterized in that it is blended.

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