JPS5844801B2 - Easy to use cement asphalt grout - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a filling roadbed track construction method using rapidly hardening cement asphalt grout.

Traditionally, as a method for filling railway trackbed ballast with rapid hardening cement asphalt grout, asphalt emulsion, sand, and water are mixed in a mixer with rapid hardening cement containing calcium aluminate or calcium haloaluminate crystals. A batch method is used in which quick-hardening cement asphalt grout is poured into the trackbed ballast.

In addition, on commercial lines, the time when the track is closed between the last train and the first train is used to fill the track bed ballast with rapidly hardening cement asphalt grout. Rapid hardening is required.

Also, rapid hardening cement asphalt grout.

An alternative to the above composition can be obtained by mixing cement asphalt with calcium aluminate and gypsum.

However, in the conventional batch method, the curing start time can be adjusted to some extent by adding a retarder during grout production, but the pot life changes depending on changes in conditions such as the environmental temperature during traversing and the temperature of the materials used. It is difficult to add a retardant at the time of construction in response to such changes, or to adjust the amount of retardant added in advance in anticipation of this change.

That is, if the pot life is increased to make it easier to work with, curing will not be sufficient, whereas if the pot life is shortened, the material will harden in the mixer before the pouring process is completed.

Furthermore, since it was a batch method, the construction efficiency was extremely low.

The main purpose of the present invention is to solve the above-mentioned drawbacks, and in particular, the present invention provides an extremely excellent filling material that can be constructed in a large scale in a short period of time and is characterized by being able to scale rapidly hardening cement-asphalt grout. We propose a trackbed track construction method.

The method of the present invention will be explained in detail below.

First, the present invention provides 12Ca0.7A1203 or 1
1Ca0・7A/203・CaX2 (X is a halogen element.

) crystalline or amorphous substances (hereinafter simply referred to as crystalline substances, etc.).

) (hereinafter simply referred to as the composition).

In order to enable each component of the composition to maintain a stable state for a long time, the components of the composition are modified according to the invention set forth in claim 1 (hereinafter referred to as the first invention).

) is a liquid composition containing at least cement and water (hereinafter referred to as liquid A).

), a liquid composition containing water, a crystalline substance, etc. as a substance that rapidly sets and hardens Liquid A (hereinafter referred to as Liquid B).

) into two groups. The cement may be Portland cement, mixed cement, or rapid/hard cement.

In addition to these essential components, Solution A may contain one or more of the other components of the composition, as long as Solution A does not set or harden rapidly, and in particular, Solution A may be used for at least 30 minutes or more. , preferably adjusted to have stability above LJ for 1 hour.

In addition, the B solution is prepared separately from the A solution, and crystals and the like are contained in the B solution.

At this time, the invention according to claim 2 (hereinafter referred to as the second invention) corresponds to Example 3 described later.

) As shown in the example below, it does not contain rapid setting and hardening stimulants such as Nacl.
Due to the crystals etc. in liquid B, liquid A can quickly solidify and harden, and when filled into the ballast orbit, it can quickly solidify and harden quickly.
That purpose can be achieved.

In addition, like the A solution, the B solution can also contain one or more of the components of the composition, and the B solution can also contain
Adjustment is made so that the B solution alone has stability for at least 30 minutes or more, preferably for 1 hour or more.

Furthermore, when liquid B and liquid A are mixed, the gel time is about 30 seconds to 20 minutes, and the compressive strength after 1 hour of carton age is 4K.
It is preferable to adjust the B solution so that q/c4 or 4Ky/crj or more is expressed.

Also, instead of separating the cement component and the rapidly hardening component such as crystalline material into liquids A and B as described above, as in the second invention, in addition to cement and water, the rapidly hardening component such as crystalline material is integrated, Furthermore, a liquid composition containing a retardant (hereinafter referred to as A1 liquid) is prepared.

) is mixed with A1 liquid to stimulate rapid setting and hardening (hereinafter simply referred to as a stimulant).

) (hereinafter referred to as B1 liquid).

) can also be divided into

In this case, the A1 liquid is well mixed in advance, and this
Because it is stimulated by the liquid and quickly sets and hardens, it is possible to obtain a grout that gains strength extremely quickly.

That is, the A1 solution contains crystals, etc., a cement component, a retarder, and water, the B1 solution contains a stimulant and water, and each group is heated for 30 minutes in the A1 solution and B1 solution. Each group is kneaded and adjusted so that it is stable and the gel time after each group is 30 seconds to 20 minutes.

The stimulant contained in this B1 liquid is one that, when combined with the A1 liquid, disrupts the alkaline balance of the A1 liquid in the direction of increasing the alkali content and triggers curing, and is composed of the following formulation or composition. Yes, I would like to include asphalt emulsion.

As for the asphalt emulsion, A1 can be used as desired as described below.
liquid or B1 liquid, or both liquids, or a third liquid.
It can be blended as C1 liquid.

(]) A. Things that react with cement in liquid or produce ettringite even when used alone, such as calcium sulfoaluminate anhydrous salt, calcium aluminate,
Calcium haloaluminate.

These amorphous substances or sulfates, etc.

(2) Alkali metal salt Na2CO3t Na OH+ K2CO3, NaC
(3) Alkaline earth metal salt Ca (0H)2. Mj9 (0H)2. In addition to CaCO3, etc. (4) and others (IX2X3), substances that disrupt the alkaline balance of A1 liquid such as cement and stimulate its rapid setting and hardening, and asphalt emulsion as long as it has good miscibility with cement. Either can be used and can be included as part of the liquid or each component in both inventions.

However, in order to easily homogenize the composition of cement asphalt mortar, it is preferable to prepare the asphalt emulsion as part of A, A, and liquid.

In addition, in the second invention, as described above, a retardant is added to the liquid as an essential component to adjust the gelation time of the A1 liquid. Metal carbonates are used.

Therefore, the effect of delaying gelation can be achieved by the mutual effect of these two components.

That is, the carbonate component of the alkali metal carbonate acts as a salt retardant in the coexistence of an organic acid such as oxycarboxylic acid.

Therefore, it is necessary that both of these components be blended together as a retarder, and it is preferable that each of these components be blended in a ratio of 0.1 to 10% by weight relative to the weight of cement.

Incidentally, when an alkali metal carbonate such as Na2CO3 does not coexist with oxycarboxylic acid or the like, it acts as a stimulant for rapid setting and hardening as described above.

The reason for this is that when used alone, the alkali metal component exhibits its effect, and when both liquids are mixed together, it stimulates and accelerates the rapid setting and hardening of cement and crystalline materials.

In addition to being blended into the Al solution in the second invention, the retarder can also be included in the B, 'U, A, and B solutions to adjust the gelation time.

In addition, during construction in cold weather, the temperature of the mixing water of the liquid containing the retarder should be maintained at 15 to 40°C to promote the reaction with cement, and the mixture of liquids A and A1 and liquids B and B should be kept at 15 to 40°C. It is preferable to stably obtain the gelation start time and initial strength after mixing.

In addition, for example, admixtures such as water reducing agents, AE agents, foaming agents, etc.
It can be included in liquid 1, liquid A, liquid B1 and liquid B.

Next, each group is adjusted separately as described above, and in both inventions, each group is continuously transported to the injection site by, for example, a pump, and mixed near the construction site to create cement-asphalt mortar grout. This grout is promptly injected into the ballast of the trackbed.

When installed in this way, each type is stable for a long time by itself, and since both liquids are mixed before pouring, troubles such as curing in the mixer are avoided. Construction is possible.

In addition, the time from gelation of the grout to the start of hardening is shortened, and in particular, the second invention has the characteristic of developing high strength in a short period of time.

That is, in the second invention, in addition to cement components and water, rapid hardening components such as crystalline substances are mixed together in the A1 liquid, so it is necessary to mix a retardant and adjust the gelation time.

However, the rapid hardening component in A1 liquid mixes well with cement, and therefore, the stimulant only stimulates the quick setting and hardening of A1 heavy liquid when it is mixed with B1 liquid, that is, instantaneously. Strength rises.

Next, examples will be described.

Example 1 Ordinary Portland cement was made into a cement paste with W/C=50%, aluminum powder was added to the cement paste in an amount of 0.01 weight relative to the weight of Portland cement, and 5001 was mixed to prepare liquid A.

Separately from this A liquid, amorphous 12Ca0・7A120312
5 to 7 (7L/-ton value 6000ca/g), anhydrous gypsum 125 to 7 (71/-/value 750cd/g), sodium gluconate (industrial reagent) 0.5 to 9, soda carbonate (
industrial reagent)], 0KIj, asphalt emulsion (Toa Road Industry Co., Ltd. T-12) 1000Ky and sand (FM=2.
0) 1000 and 7 were mixed to make liquid B.

Next, liquid A and liquid B were mixed in a Y-tube at a ratio of 1 k of liquid A to 1 k of liquid B using a Y-tube, and the mixture was poured into the ballast track bed of the railway service line in the Omi factory of Denki Kagaku Kogyo Co., Ltd. It was filled with.

In addition, in order to investigate the possibility of pumping construction,
Liquid and B liquid were transported separately through pipes for approximately 100 m, and A was transported near the filling point.

It was confirmed that it is possible to put into practical use a filling pump pressure-feeding construction in the ballast track bed by mixing both B liquids.

The properties and pumping conditions of liquids A and B were as shown in Table 1, and the properties of the cement asphalt grout obtained by mixing both liquids A and B were as shown in Table 2.

As a result of pouring as described above, a freight train was allowed to pass 60 minutes after pouring, and no abnormalities were observed.

In addition, the mixture of the above liquids A and B was mixed into 4x4xxem・”f
After mixing both liquids, the mixture was placed in a fi mold and cured on site for 30 minutes, 60 minutes, 90 minutes, 180 minutes, 1 day, and 28 days, and the compressive strength of each was measured, and the results shown in Table 3 were obtained.

In addition, when a mixture of 1000 Ky of asphalt emulsion and 1000 kg of sand was prepared as liquid B, and this was mixed with the above liquid A at a weight ratio of 1:1, the J funnel flow was 8 seconds, the gel time was 8 hours, 1 day, and The compressive strengths at 28 days were 0.3 Kg/c4 and 40 Kg/crA, respectively.

Example 2 Solution A was prepared by mixing ordinary Portland cement, asphalt emulsion, and others in the formulation shown in Table 4.

During kneading, a set retardant consisting of 3 t (y) of citric acid and 9 K9 of potassium carbonate is mixed separately into liquids A and B as shown in Table 6, and liquids A and B are mixed together. The solution was prepared separately.

The A liquid and the B liquid prepared under the above conditions were individually pumped to the construction site using a grout pump, and there, the A liquid and the B liquid were mixed using a Y-shaped pipe.

When the gelation start time after this mixing and the compressive strength after 1 hour of material age were determined, the results shown in Table 6 were obtained.

Example 3 Using the same materials as in Example 1, A of the formulation shown in Table 7 was prepared.
Make liquid 1 and liquid 81 separately, then add liquid A1 and liquid 81.
liquid at a ratio of A/B (weight ratio) = 110.3,
When the properties of the cement asphalt mortar produced as a result were investigated, the results shown in Table 7 were obtained.

The specimen for the compressive strength test was made by pouring the mixture of the above A1 and 81 into a 4X4X16z mold, and then
It was air-dried and cured in a constant temperature room at ℃.

Moreover, the gel time indicates the time when the gel stops flowing down in the J-funnel.

In Table 7, commercially available rapid hardening cement is 11Ca.
It contains O.7A1203.CaF2.

As explained in detail above, in the method of the present invention, the rapidly hardening cement asphalt component is divided into liquid A1 and liquid 81, each liquid composition is prepared separately, and then these liquid compositions are continuously pumped using a pump or the like. It is characterized by being transported and mixed at the construction site, and then injected into the ballast track bed, etc. to obtain a ballast track bed with appropriate viscoelasticity.The effects of the present invention method related to such a configuration are summarized below. It is shown as follows.

1) Very good workability.

2) It is possible to use cement-asphalt mortar, which gels or hardens in a few minutes, but can be cast using conventional methods.

3) Good curing properties.

This solves the problem of not exhibiting strength at low temperatures.

4) Strength, elasticity, gel time, fluidity, etc. can be freely changed by mixing the A liquid and the B liquid at different proportions.

5) A large amount of pouring can be done in a short period of time.

6) Construction costs are low.

7) Due to the above-mentioned effects, a construction method using, for example, pump pressure feeding becomes possible, and the construction efficiency is significantly improved.

Although the above description has focused on the case where the components of the rapidly hardening cement asphalt composition are divided into two types of liquid compositions and adjusted separately, the method of the present invention does not necessarily require the use of two types of liquid compositions. There is no need to divide into only
Each divided and conditioned liquid composition contains at least 3
If stability for 0 minutes or more can be maintained, the components of the rapidly hardening cement asphalt composition can be divided into three or more liquid compositions and adjusted separately.

Claims (1)

[Claims] 1 At least 12Ca0.7A1203 or 1
When filling a ballast orbit with a rapidly hardening cement asphalt composition containing a cement component and a rapidly hardening component consisting of a crystalline or amorphous substance of 1Ca0.7AlO-CaX2 (X is a halogen 3 element), , each component of these rapid hardening cement asphalt compositions is divided into multiple groups,
Among these groups, one group does not contain the crystalline or amorphous rapid hardening component and contains at least a cement component and water, and at least one other group contains the crystalline or amorphous rapid hardening component. Each group contains a rapid hardening component of solid or amorphous material, and each group contains a retarder as desired, so that each group is stable for 30 minutes or more and the gel time after combining each group is 30 seconds to 20 seconds.
Each group is kneaded and adjusted so that the material has a compressive strength of 4 kg/c at one hour of age.
A filling track construction method for a ballast track using a rapidly hardening cement asphalt grout, which is characterized in that the cement asphalt grout is mixed and injected so as to develop 77 f or more. 2 At least 12Ca0・7A1203 or
]lCaO・7A1203・CaX2 (where X is an FF element.) A rapid hardening component consisting of a crystalline or amorphous substance, a cement component containing oxycarboxylic acid or its alkali salt, and an alkali metal carbonate. When filling the balance orbit with a quick-setting cement asphalt composition containing a retardant, the above-mentioned cement components, and a quick-setting quick-hardening stimulant that stimulates the quick-setting and quick-hardening components to quick-set and harden, these quick-setting cement asphalt 1ifl. Each component of a certain substance is divided into a plurality of groups, and among these groups, one group is made from the crystalline or amorphous substance together with at least the cement component and water, without containing the rapid setting rapid hardening stimulant. At least one other group contains at least the rapid setting rapid hardening stimulant, each group is stable for 30 minutes or more, and the gel time after each group is combined is 30 seconds. Each group was kneaded and adjusted so that the mixing time was ~20 minutes, and then each group was individually and continuously transported to the filling site, where each group was combined and the compressive strength at 1 hour of age was yucq. /c,
A method for constructing a filled track bed for a ballad track using rapidly hardening cement asphalt, which is characterized in that cement asphalt grout is mixed and injected so as to achieve a hardness of more than i.