JP2534572B2 - One-powder type polymer-cement composition for semi-flexible pavement and its construction method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to the construction of semi-flexible pavement for roads,
TECHNICAL FIELD The present invention relates to a one-powder polymer cement composition for semi-flexible pavement that is simple and has excellent workability with no mixing errors, and has good finishability, and a method for constructing a semi-flexible pavement using the one-powder polymer cement composition.

[Conventional technology]

The salviasim method (Japanese Patent Publication No. 40-3504) and the policy construction method (Japanese Patent Publication No. 43-4696), which are conventionally called and used as semi-rigid pavement method, are used to mix resin emulsion or rubber latex and water mixture at the road pavement site. While stirring beforehand,
A method is known in which powders such as cement and silica sand are added to this to prepare cement milk to be used as grout, and then the milk is poured into open-grain size asphalt concrete. These methods are construction methods that compensate for the long-standing drawbacks of asphalt concrete pavement and cement concrete pavement, and have come into the spotlight as fluid-resistant pavement. Particularly in metropolitan areas, due to increased traffic volume, weaving and destruction occur, and the need for pavement anti-flow is further increasing.

[Problems to be Solved by the Invention]

In order to secure the traffic function, which is the primary function of the road, the pavement construction form in the metropolitan area as described above must be a night work or a work within a short time traffic regulation. , It is necessary to finish from the open-grained asphalt concrete pavement to the grout injection within the regulation time.

However, in the conventional semi-flexible pavement construction method, several or more kinds of compounding materials are metered and mixed at the work site, so the time required for this cannot be ignored. Further, the measuring and mixing work often relies on the labor of an inexperienced worker or the like, and there is a possibility of a mixing error.

In order to improve these to some extent, one bag unit is added, but it is not perfect, and in some cases, it may occur that the basic formulation is deviated. In particular, when using a rapid hardening cement, deviation from the basic composition is likely to cause an increase in grout viscosity. As a result, the permeability into the open-grained asphalt concrete pavement voids is not sufficient, and it is not possible to obtain a pavement having both flexibility and rigidity, which is intended by the ratio method. In addition, due to the increase in viscosity, the finished work may not be sufficiently satisfactory.

[Means for solving the problem]

In view of the above circumstances, the present inventors have no grouting permeation into the voids of the open-grain size asphalt concrete pavement within a shortest possible time and there is no mixing error at the construction site.
As a result of various studies on simple construction methods, the present invention has been achieved.

That is, the one-powder type polymer cement composition for semi-flexible pavement of the present invention is prepared by mixing and adjusting constituent materials including cement, fly ash, silica sand and re-emulsifiable powder polymer, and optionally a powder additive. It is characterized by

Further, the method for applying the semi-flexible pavement-powder type polymer cement composition of the present invention comprises mixing and adjusting constituent materials including cement, fly ash, silica sand and re-emulsifiable powder polymer and optionally a powder additive. It is characterized in that water is added to the one-powder type polymer cement composition thus obtained, and the mixture is agitated and mixed, and the polymer cement grout is injected into the aggregate gap of the open-grain size asphalt concrete.

 Hereinafter, the present invention will be described in detail.

(Composition) Examples of the re-emulsifiable powder polymer used in the present invention include commercially available vinyl acetate-based polymers. Examples thereof include ethylene vinyl acetate resin, carboxylic acid-modified vinyl acetate resin, Veova-modified vinyl acetate resin, vinyl acetate-acrylic acid ester copolymer, and the like, which can be used as they are.

Examples of the cement include ordinary Portland cement, early-hardening cement, ultra-fast-hardening cement, various quick-hardening cements, white cement, and various color cements.

For urgent road repairs that require finishing in a short time, it is necessary to accelerate the hardening of the cement. In this case, quick-hardening cement can be used depending on the purpose and application. When using fast-setting cement, a set retarder (setter) may be used.

As silica sand, it is preferable to use relatively fine silica sand of No. 7. Also in the present invention, good results have been obtained using No. 7 silica sand. Instead of silica sand, water granulated slag generated at an iron mill may be used or used together. Also, it is advisable to mix fly ash in order to improve fluidity. As other powder additives, a water reducing agent, a fluidizing agent, a defoaming agent and the like can be added.

 Next, the blending amounts of various components and the mixing method will be described.

10 to 60 parts, preferably 15 to 50 parts of silica sand are added to 100 parts by weight of Portland cement (hereinafter simply referred to as "part"). As the silica sand, relatively fine silica sand of No. 6-8 is used. Instead of silica sand, the same amount of water granulated slag generated at a steel mill may be used or used together. In addition, 15 to 70 parts, preferably 20 to 50 parts, of fly ash is mixed in order to improve the fluidity.

The amount of the re-emulsifiable powder polymer is in the range of 0.5 to 10 parts, preferably 1 to 8 parts, relative to 100 parts of cement,
Addition of more than this does not significantly improve the physical properties,
Rather, it only increases viscosity and cost. (See Fig. 1) In order to improve the injection property as a grout, it is necessary to lower the viscosity and the flow value. In the semi-flexible pavement construction method, the flow value is adjusted to 10 to 14 seconds. Is common. Although the flow value becomes smaller by increasing the amount of water, it will reduce the physical properties of the mortar, so it is preferable to use a general fluidizing agent as a water reducing agent for cement concrete, and its amount is 2 parts or less, More preferably 0.05 to 1.5 parts is used. Moreover, when water is added last at the construction site, air may be involved, so 0.05 to 0.4 parts, preferably 0.1 to 0.3 parts, of a powdered defoaming agent may be added.

For color paving, it is also possible to add 2 to 4 parts of an inorganic colorant such as red iron oxide. In this case, if a lighter color is desired, it is better to use white cement instead of ordinary Portland cement.

In road pavement work, repair and repair work is often performed, and in the semi-flexible pavement construction method, grout containing the one-powder polymer cement composition of the present invention as an active ingredient can also be used. However, in the case of repair work, it is necessary to open the traffic as soon as possible because it is a road currently shared. For that purpose, it is necessary to accelerate the hardening of the cement, and in this case, instead of the ordinary Portland cement, a rapid hardening cement, an ultra-fast hardening cement or the like is used. In this case, these may be used alone or in combination with ordinary Portland cement.
When using rapid hardening cement, a set retarder (setter) may be used. Further, ordinary Portland cement may be used and a hardening accelerator may be added to accelerate hardening.

No special device is required for mixing these powders, and a general powder mixing device (for example, V-type mixer, vertical V-type mixer, universal mixer, etc.) is used.

The mixed powder thus obtained is filled in a paper bag having excellent moisture resistance, which is generally used for cements, sealed and stored, and shipped to a construction site as needed.

[Construction method]

The method for constructing a semi-flexible pavement using the one-powder type polymer cement composition according to the present invention uses the one-powder polymer cement composition, and therefore, the one-powder polymer cement composition (hereinafter referred to as prepared powder) at the construction site. 2 parts to 100 parts of water)
Only 0 to 60 parts, preferably 25 to 50 parts are used, no special machine is required. The conventional mixing and stirring device can be used as it is. The injection of the finished polymer cement grout can also be performed by the conventional construction method using mechanical equipment.

Hereinafter, the present invention will be described in more detail with reference to examples.
In the examples and comparative examples, parts and% mean parts by weight and% by weight, respectively.

Example 1 (Preparation of pre-mixed powder) 100 parts of Portland cement was put, 20 parts of silica sand and 40 parts of fly ash were put in a container of a universal mixer, a stirring blade was attached, and the mixture was stirred again at low speed for 10 minutes. Then, as a re-emulsifiable powder polymer, ethylene vinyl acetate resin was added 3.6 times and 0.8 parts of a water reducing agent and 0.2 part of a defoaming agent, the stirring speed was made high, and the mixture was stirred and mixed for 20 minutes to prepare a prepared powder, which was then placed in a closed container. Put and save.

(Preparation of base ascon) The base ascon to be injected is an open particle size having a porosity of 22% in which 3.8% of paving asphalt having a penetration of 60 to 80 is mixed with the open particle size aggregate having the particle size distribution shown in Table 1. Asphalt concrete, 30 × 30 using a formwork prepared in advance
It was laid out so that the size of cm was 5 cm in thickness, and the compacted product was used.

(Injection of grout) 100 parts of the prepared powder prepared above was taken out from the closed container, placed in a mortar mixer, 40 parts of water was added, and the mixture was stirred and mixed at a low speed for 5 minutes.

When the flow value of this product was measured, it turned out to be grout in 12 seconds and showed appropriate properties.

The grout thus prepared was poured into the above-mentioned base Ascon, spread with a rubber rake, and allowed to penetrate completely without vibration.

The physical properties of the pavement and grout thus obtained were as shown in Table 2.

Example 2 (Preparation of ready-mixed powder) 30 parts of silica sand, 40 parts of fly ash, and 0.2 parts of a set retarder were placed in a container of a universal mixer with respect to 100 parts of quick-hardening cement,
The mixture was stirred for 10 minutes in the same manner as in Example 1. Then, as a re-emulsifiable powder polymer, 3.8 parts of Veova modified vinyl acetate resin and 0.1 part of a water reducing agent and 0.2 part of a defoaming agent were added,
It was prepared by the same method as in Example 1, and was stored in a closed container.

(Injection of grout) 100 parts of the prepared powder prepared above was taken out of the closed container, put in a mortar mixer, 40 parts of water was added, and the mixture was stirred and mixed at a low speed for 4 minutes.

When the flow value of this product was measured, it turned out to be grout in 12 seconds and showed appropriate properties.

The grout thus prepared was poured into a base ascon prepared in the same manner as in Example 1, spread using a rubber rake, and allowed to penetrate completely without vibration.

The physical properties of the pavement and grout thus obtained were as shown in Table 2.

Example 3 (Preparation of pre-mixed powder) 100 parts of Portland cement, 20 parts of silica sand and 25 parts of fly ash were placed in a container of a universal mixer and stirred for 10 minutes in the same manner as in Example 1.

Next, 3.2 parts of a carboxylic acid-modified vinyl acetate resin was added as a re-emulsifiable powder polymer, stirred for 20 minutes, prepared in the same manner as in Example 1, and placed in a closed container and stored.

(Injection of grout) 100 parts of the prepared powder prepared above was taken out from the closed container, 40 parts of water added to the mortar mixer was added, and the mixture was stirred and mixed at a low speed for 4 minutes.

When the flow value of this product was measured, it showed proper properties as grout in 11 seconds.

The grout thus prepared was poured into a base ascon prepared in the same manner as in Example 1, spread with a rubber rake, and allowed to penetrate completely without vibration.

The physical properties of the pavement and grout thus obtained were as shown in Table 2.

Comparative Example 1 (Preparation of pre-mixed powder) For 100 parts of Portland cement, 20 parts of silica sand and 40 parts of fly ash were placed in a container of a universal mixer, a stirring blade was attached, and the mixture was first stirred and mixed at low speed for 10 minutes to obtain a polymer. A powder to which was not added was prepared, placed in a closed container and stored.

(Injection of grout) 100 parts of the prepared powder prepared above was taken out of the closed container, put in a mortar mixer, 40 parts of water was added, and the mixture was stirred and mixed at a low speed for 4 minutes.

When the flow value of this grout was measured, it was 12 seconds, and it showed suitable properties as a grout.

The grout thus prepared was poured into a base ascon prepared in the same manner as in Example 1, spread using a rubber rake, and allowed to penetrate completely without vibration.

The physical properties of the pavement and grout thus obtained were as shown in Table 2.

Comparative Example 2 (Preparation of pre-mixed powder) For 100 parts of Portland cement, 20 parts of silica sand and 40 parts of fly ash were placed in a container of a universal mixer, a stirring blade was attached, and the mixture was stirred and mixed at a low speed for 10 minutes at first to obtain a polymer. A powder to which was not added was prepared, placed in a closed container and stored.

(Injection of grout) 100 parts of the prepared powder prepared above was taken out from the closed container, put in a mortar mixer, 35 parts of water was added, and then 8 parts of styrene-budadiene rubber latex was added as a polymer and mixed with stirring for 5 minutes.

When the flow value of this grout was measured, it was 11 seconds, and it showed suitable properties as a grout.

The thus-prepared grout was poured into a base substrate made of ascon by the same method as in Example 1, spread with a rubber lake, and allowed to penetrate completely without vibration.

The physical properties of the pavement and grout thus obtained were as shown in Table 2.

Comparative Example 3 (Preparation of grout) 70 parts of water was put into a mortar mixer, 10 parts of styrene-butadiene rubber latex was added, and the mixture was stirred at low speed for 1 minute at first.

Next 100 Portland cement, 5 fly ash
0 part and 40 parts of silica sand were added in this order, the stirring speed was increased, and the mixture was stirred and mixed for 5 minutes to prepare a grout.

When the flow value of this grout was measured, it was 11 seconds, and it showed suitable properties as a grout.

(Injection of grout) The grout prepared above was taken out from the mixer, poured into a base ascon prepared in the same manner as in Example, spread with a rubber lake, and allowed to penetrate completely without vibration.

The physical properties of the thus obtained graft and pavement are as shown in Table 2.

Construction Test An open-grained asphalt concrete having a particle size distribution shown in Table 1 was paved outdoors using an actual construction machine, prepared with the same composition and method as in Example 1, and stored in a paper bag. 100 parts of the prepared powder for injection was put into a mortar mixer, 40 parts of water was added, and the mixture was stirred and mixed for 5 minutes, then injected, spread with a rubber lake, and sufficiently permeated with a vibrating roller. At that time, the time required for the preparation of the grout, the permeability, etc. were measured, and the subsequent follow-up was performed.

Similarly, outdoors, the grout having the composition shown in Comparative Example 3 was prepared at the construction site, injected into the same substrate ascon as above, and sufficiently permeated in the same manner to obtain the time required for the preparation of the grout and the permeability. Etc. were measured and the subsequent follow-up was performed. Table 3 shows the results.

[Curing of Invention] As described above, according to the present invention, not only is there a risk of mixing mistakes when preparing grout at a construction site, but it is also used for urgent road repair work that requires finishing in a short time. The effect of fast-setting cement can be minimized. Especially in the summer, the curing may become too fast, so the time required for stirring and mixing is important.Mixing errors in the case of the quick hardening type not only impair the performance of the pavement, Such hardening will cause the grout to harden in the mortar mixer, the injection hose, etc., which will hinder the work. The present invention has solved these conventional problems.

Further, as shown in Tables 2 and 3, the performance of the pavemented semi-flexible pavement according to the present invention is not much inferior to that obtained by the conventional method using a latex emulsion, and conforms to the specifications of government agencies. To do.

It can be said that it is an extremely effective composition and its construction method in terms of dealing with the shortage of manpower on site, which will become more and more serious in the future.

[Brief description of drawings]

FIG. 1 is a graph showing the relationship between the blending amount of the re-emulsifiable powder polymer and the viscosity and bending strength.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shoji Uematsu 1-19-11 Kyobashi, Chuo-ku, Tokyo Within Japan Tamaido Co., Ltd. (72) Inventor Tadayuki Kuzuyama 1-5-5 Ojita, Yokkaichi-shi, Mie Japan Latex Processing Co., Ltd. (72) Inventor Tadayoshi Hotta 1-5-5 Ojita, Yokkaichi-shi, Mie Prefecture Japan Latex Processing Co., Ltd. (72) Inventor Koji Tanimura 1-5-5 Ojita, Yokkaichi-shi, Mie Japan Latex Processing Co., Ltd. (72) Inventor Ken Itakura 1-5-5 Ojita, Yokkaichi-shi, Mie Japan Latex Processing Co., Ltd. (56) Reference JP-A-2-85405 (JP, A) Polymer processing 30 [7] (1981) Polymer Society P. 6-12

Claims (2)

(57) [Claims] 1. A cement composition for preparing cement milk used as a grout material in a semi-flexible pavement construction method for road pavement, wherein fly ash is 15 to 70 parts by weight per 100 parts by weight of cement in advance. Part, silica sand 10 to 60 parts by weight, re-emulsifiable powder polymer 0.5 to 10 parts by weight, and a mixture of constituent materials including a powder additive if desired, a semi-flexible pavement powder. -Type polymer cement composition. 2. A one-powder polymer prepared in advance in the semi-flexible pavement construction method for road pavement, using cement milk used as a grout material, according to the composition described in claim 1. Construction method using a one-powder type polymer cement composition for semi-flexible pavement, characterized in that water is added to the cement composition and stirred and mixed, and the polymer cement grout is injected into the aggregate gap of the open particle size asphalt concrete. .