JP2015143423A - Cold application-type lightweight pavement material composition - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cold application-type lightweight pavement material composition which is lightweight and rich in workability, and which has strength and durability, necessary for a road surface pavement application.SOLUTION: A cold application-type lightweight pavement material composition of the present invention includes an alkaline additive that saponification-reacts with a hardener by adding the hardener including any one of aggregate, asphalt, fats and oils and a fatty acid, and a hardening initiator. In the cold application-type lightweight pavement material composition, the aggregate has a bulk density of 0.5-1.9 g/cmand water absorption of 2-35%.

Description

  The present invention relates to a room temperature construction type lightweight pavement composition used for road pavement.

When pavement repairs such as potholes, asphalt repair materials that are packed in room temperature are used. As this asphalt repair material, an aggregate having a bulk density of about 2.5 g / cm ³ is generally used, and the weight is often 20 to 30 kg per bag. In road pavement sites where there is a lot of traffic, vehicles cannot be parked nearby, and often the asphalt repair material has to be transported manually from a remote location. Since it is necessary to repair many places on a day, the weight of 20 kg to 30 kg per bag places a heavy burden on workers.

For this reason, there are some that reduce the capacity per bag and have a weight of 10 kg to 15 kg per bag. However, the construction area per bag is reduced, so the work efficiency is reduced and the fundamental solution. It has not reached.
In addition, lightweight aggregates are becoming widespread in building concrete and civil engineering embankment materials, but the lightweight aggregates are inferior in strength and durability in paving applications, and are therefore used as aggregates used in asphalt pavement. Not.

By the way, as a pavement composition of room temperature construction type excellent in strength and durability in paving applications, a curing agent containing any of aggregate, asphalt, fats and fatty acids, an alkaline additive, and the curing agent and the alkaline addition There has been proposed one containing a curing initiator that causes a saponification reaction with an agent (see Patent Documents 1 and 2).
In this pavement composition, a road surface pavement excellent in strength and durability can be realized by saponifying the curing agent and the alkaline additive that have been infiltrated between aggregates with the curing initiator.

JP 2010-248472 A International Publication No. 2011-086722

The inventor changes the aggregate contained in the normal temperature construction type pavement composition from a general one to a lightweight aggregate having a low bulk density, and is necessary for road pavement applications while being lightweight. An attempt was made to develop a pavement composition having strength and durability.
Under the above trial, as a result of trial and error, even in the lightweight aggregate that has been conventionally difficult to apply to the asphalt pavement, if it is a lightweight aggregate having a predetermined characteristic, the curing agent and the It was found that the alkaline additive penetrates into each aggregate particle constituting the light-weight aggregate to improve the strength and durability after construction.

  An object of the present invention is to solve the above-mentioned problems in the prior art, to provide a light-weight pavement material composition that can be applied at room temperature and has strength and durability that are light and have high workability, and are required for road pavement applications. To do.

The present invention is based on the above knowledge, and means for solving the above problems are as follows. That is,
<1> A light-weight pavement composition for room temperature construction, comprising a hardener containing any of aggregate, asphalt, fats and oils, and an alkaline additive that saponifies with the hardener by adding a hardening initiator. wood has a bulk density of ^{0.5g / cm 3 ~1.9g / cm 3} , and cold construction type lightweight paving composition, wherein the water absorption is 2% to 35%.
<2> cold construction type lightweight paving material composition according to the bulk density of the aggregate is ^{1.0g / cm 3 ~1.6g / cm 3} <1>.
<3> The room temperature construction type lightweight pavement composition according to any one of <1> to <2>, wherein the aggregate has a water absorption rate of 5% to 20%.

  According to the present invention, it is possible to solve the above-mentioned problems in the prior art, and provide a light-weight pavement composition that can be applied at room temperature and has lightness, excellent workability, and strength and durability required for road pavement applications. can do.

It is the microscope picture image which imaged the penetration | invasion conditions, such as a hardening | curing agent with respect to the aggregate of the normal temperature construction type lightweight pavement composition which concerns on Example 3, and an alkali additive. It is the microscope picture image which imaged only the aggregate used for the normal temperature construction type lightweight pavement composition which concerns on Example 3. FIG.

The room temperature construction-type lightweight pavement composition of the present invention includes aggregate, asphalt, a curing agent, and an alkaline additive, and includes other components as necessary.
In the present specification, “normal temperature construction” indicates that construction can be performed at 20 ° C.

<Aggregate>
The aggregate has a bulk density of ^{0.5g / cm 3 ~1.9g / cm 3} , and lightweight aggregate having a water absorption rate of 2% to 35% is used.
When the bulk density is less than 0.5 g / cm ³ , the curing agent and the alkaline additive excessively penetrate into the aggregate particles constituting the aggregate, and the workability of the composition at normal temperature is improved. It will be greatly damaged, making construction impossible or construction failure likely to occur, and if it exceeds 1.9 g / cm ³ , weight reduction cannot be achieved.
Further, if the water absorption is less than 2%, the curing agent and the alkaline additive do not sufficiently penetrate into the aggregate particles, and the strength and durability necessary for road pavement cannot be obtained, and 35% When the average particle size exceeds 50%, the curing agent and the alkaline additive excessively penetrate into the aggregate particles, and the workability at room temperature of the composition is greatly impaired, so that the work cannot be performed or the work is liable to occur.
Based on the above knowledge, the normal temperature construction type lightweight pavement composition has the core of the technology to set the bulk density and the water absorption rate of the aggregate within a predetermined range. Above all, when the bulk density of the aggregate is at ^{1.0g / cm 3 ~1.6g / cm 3} , a sufficient weight reduction it is possible to further improve the strength and durability required for road paving Moreover, the intensity | strength and durability which are required for road surface paving can be improved further as the water absorption is 5%-20%.
Note that the permeability of the curing agent and the alkaline additive to the aggregate is indicated by “water absorption”, and “water absorption” is generally used to indicate the permeability of the liquid to the aggregate. This is because the liquid curing agent in which the alkaline additive is dispersed penetrates into the aggregate according to the “water absorption rate”.

  There is no restriction | limiting in particular as a material of the said aggregate, According to the objective, it can select suitably, For example, shale, waste glass, coal ash (fly ash, clinker ash), obsidian stone, and these processed materials Examples of the processed product of shale include an expansive shale calcined product, and examples of the processed coal ash include fly ash solidified product. Among these, from the viewpoint of permeability of the curing agent and the alkaline additive, the expansive shale calcined product is preferable. In addition, these may be used individually by 1 type and may use 2 or more types together.

Moreover, as an aggregate used for the light-weight pavement composition for room temperature construction type, a general bone having a large bulk density used for asphalt pavement in addition to the aggregate having the predetermined bulk density and the water absorption rate. Materials may be added. Here, the general aggregate is referred to as “normal aggregate” and is distinguished from the aggregate having the predetermined bulk density and the water absorption rate.
The content ratio with respect to the aggregate in the case of using the normal aggregate is not particularly limited, but the content ratio of the aggregate contained in the total aggregate including the normal aggregate and the aggregate is 25. The volume is preferably at least volume%, more preferably at least 50 volume%, particularly preferably at least 75 volume%. When the content ratio is such, the strength and durability can be improved while achieving a reduction in the weight of the room temperature construction-type lightweight pavement composition. In addition, in the said normal temperature construction type lightweight pavement composition, the said aggregate can be used without using the said normal aggregate (100 volume%).

  The content ratio of the aggregate to the binder in the normal temperature construction type lightweight pavement composition when the asphalt and the curing agent are referred to as “binder” is not particularly limited, but “the aggregate: the binder” Is preferably 95: 5 to 70:30. With such a content ratio, it is possible to efficiently produce the room temperature construction type lightweight pavement composition containing the aggregate whose strength and durability are improved by the penetration of the curing agent and the alkaline additive. it can.

<Asphalt>
There is no restriction | limiting in particular as said asphalt, According to the objective, it can select suitably, For example, straight asphalt 40/60, 60/80, 80/100, 100/120 etc. can be mentioned. In addition, these may be used individually by 1 type and may use 2 or more types together.

<Curing agent>
The said hardening | curing agent contains either fats and oils and a fatty acid.
The curing agent is not particularly limited and may be appropriately selected depending on the intended purpose, but it is derived from plants such as tall oil fatty acid, soybean oil fatty acid, cottonseed oil fatty acid, rice bran oil fatty acid, rapeseed oil fatty acid, sunflower oil fatty acid and the like. Fatty acids and their esters are preferred. By using the plant-derived fatty acids and their esters, a part of the role of the asphalt as a binder can be replaced with such plant-derived materials, and the environmental burden can be reduced. Among these, the tall oil fatty acid is preferable because of excellent strength and durability of the paved road surface. In addition, these may be used individually by 1 type and may use 2 or more types together.
The content ratio of the curing agent in the room temperature construction type lightweight pavement composition is preferably 10:90 to 90:10 in mass ratio of “the asphalt: the curing agent”. In addition, since the usable temperature range is expanded as the addition amount of the curing agent is increased, it is preferable to determine the addition amount of the curing agent according to construction conditions.

<Alkaline additive>
The alkaline additive is a component that undergoes a saponification reaction with the curing agent by adding a curing initiator (for example, water).
The saponification reaction may be a reaction that generates a fatty acid alkali salt. For example, a saponification method that generates a fatty acid alkali salt (soap) and glycerin by adding alkaline water to a higher fatty acid ester, The neutralization method etc. which neutralize with water are mentioned.
In the saponification reaction, when an alkali component is added in a solid state, the reaction does not start unless a solvent such as water is present. On the other hand, when a solvent such as water is present, a reaction of “the curing agent (oil and fat, fatty acid) + alkaline additive + water = soap (solid)” occurs to produce soap.
As a typical example of the saponification reaction, a reaction example by a saponification method using a higher fatty acid ester and sodium hydroxide (alkali) is represented by the following formula (1), and a reaction by a neutralization method using a higher fatty acid and sodium hydroxide. Examples are shown in the following formula (2), respectively.

In the room temperature construction type lightweight pavement composition, the aggregate particles contained in the aggregate are strongly bonded by utilizing the saponification reaction of the curing agent and the alkaline additive generated by the action of the curing initiator. In addition, the strength and durability of each aggregate particle are improved by allowing the curing agent and the alkaline additive to penetrate into each aggregate particle.
Accordingly, the alkaline additive is not particularly limited as long as it is a compound that becomes the alkaline component of the saponification reaction by the action of the curing initiator, but is low from the viewpoint of effectively neutralizing the fatty acid. Those exhibiting a hydrogen ion concentration (that is, having a high pH) are preferred.
As such an alkaline additive, it is possible to use sodium hydroxide, potassium hydroxide or the like used for the production of the soap, but from an environmental viewpoint, cement used as a general civil engineering material is used. Among these, ordinary cement (ordinary Portland cement) exhibiting a low hydrogen ion concentration by the action of the curing initiator is preferable.
As the ordinary Portland cement is not particularly limited, for example, tricalcium silicate (3CaO · _SiO 2), dicalcium silicate (2CaO · _SiO 2), calcium aluminate _{(3CaO · Al 2 O 3)} , calcium aluminosilicate Examples include ferrite (4CaO.Al ₂ O ₃ .Fe ₂ O ₃ ), calcium sulfate (CaSO ₄ .2H ₂ O) and the like as main components.
In addition to the above, the alkaline additive includes an aqueous solution containing metal ions such as sodium ion (Na ⁺ ), potassium ion (K ⁺ ), magnesium ion (Mg ²⁺ ), calcium ion (Ca ²⁺ ), water, it can be used such as a powder comprising decomposing metal salt in the each ion by the addition of sodium bicarbonate (NaHCO _3), potassium bicarbonate (KHCO _3).
The content ratio of the alkaline additive in the room temperature construction-type lightweight pavement composition is preferably 100: 10 to 100: 300 in terms of a mass ratio of “the curing agent: the alkaline additive”.

<Other ingredients>
There is no restriction | limiting in particular as long as the said other component does not impair the effect of this invention, The other additive normally used in the field | area of asphalt pavement can be used. Examples of such additives include fillers, plant fibers, pigments, antifreezing agents and the like.

<Curing initiator>
The room temperature construction type lightweight pavement composition causes the saponification reaction of the curing agent and the alkaline additive by adding the curing initiator during construction.
The curing initiator is not particularly limited as long as it causes such a saponification reaction, and can be appropriately selected according to the purpose, but water can be preferably used.

<Preparation method>
There is no restriction | limiting in particular as a preparation method of the said normal temperature construction type light weight pavement composition, It can add and mix and prepare each component until it becomes uniform by a well-known method. For example, the aggregate and the asphalt agent in a heated state, the curing agent, and the alkaline additive may be appropriately added and mixed.
Here, although there is no restriction | limiting in particular as a heating temperature at the time of the dry mixing of the said aggregate, 100 to 140 degreeC is preferable and 110 to 130 degreeC is more preferable. The heating time is usually about 1 second to 1 minute. By performing the dry mixing at such a heating temperature and heating time, the amount of water contained in the aggregate can be controlled.
Moreover, as heating temperature of the said asphalt, 130 to 170 degreeC is preferable and 140 to 160 degreeC is more preferable.
The curing agent may be added as it is at room temperature, but it is preferably used after being heated to about 15 ° C. to 25 ° C. in the cold season.

<Construction method>
As the room temperature construction type lightweight pavement composition obtained as described above, it is filled in a bag provided with a moisture permeation preventing layer and a heat sealing layer, and then the heat sealing layer is heated and pressure-bonded with a heat sealer or the like. The heat-sealing layer can be sealed and stored in the bag by heat-sealing.
As a construction method of the paved road surface by the room temperature construction type lightweight pavement composition, for example, after transporting the bag to a construction place, the room temperature construction type lightweight pavement composition is taken out from the bag, and the curing initiator ( For example, there is a method in which water) is added and spread on the target construction site and then compacted.

Example 1
Supersol (L4) as aggregate (bulk density: 1.309 g / cm ³ , water absorption: 3.8%, manufactured by Trim Co., Ltd., waste glass processed product) 80.1 parts by mass, filler (Okutama Industry) Co., Ltd., stone powder) 6.5 parts by mass, asphalt (Showa Shell Sekiyu KK, straight asphalt 60/80) 6.6 parts by mass, tall oil fatty acid 5.4 parts by mass as a curing agent, And 1.4 parts by weight of ordinary Portland cement (manufactured by Taiheiyo Cement Co., Ltd.) as an alkaline additive are mixed using a biaxial pug mill type mixer, and the room temperature construction type lightweight pavement composition according to Example 1 is obtained. Prepared. The total addition amount of asphalt and tall oil fatty acid is “binder amount”. In the following examples and comparative examples, the content ratio of asphalt and tall oil fatty acid in the binder amount should not be changed from the content ratio in Example 1. It was.
The aggregate was mixed while being heated to 120 ° C, the asphalt was mixed while being heated to 160 ° C, and the other members were mixed at room temperature. In the following examples and comparative examples, each component was mixed under the same temperature conditions.

(Example 2)
Mesalite as an aggregate (bulk density: 1.316 g / cm ³ , water absorption: 7.5%, manufactured by Nippon Mesalite Industry Co., Ltd., calcined shale product) 78.3 parts by mass, filler (Okutama Industry) Co., Ltd., stone powder) 6.1 parts by mass, asphalt (Showa Shell Sekiyu KK, straight asphalt 60/80) 7.7 parts by mass, tall oil fatty acid 6.3 parts by mass as a curing agent, Then, 1.6 parts by mass of ordinary Portland cement as an alkaline additive was mixed using a biaxial pug mill type mixer to prepare a room temperature construction type lightweight pavement composition according to Example 2. In addition, the change in the amount of the binder is performed in order to adjust the fluidity and the like of the room temperature construction type lightweight pavement composition in the same manner as in Example 1 in accordance with the increase in the water absorption rate of the aggregate. This is the same purpose in the examples and comparative examples.

(Example 3)
Taiheiyo Calstone L (bulk density: 1.338 g / cm ³ , water absorption: 12.7%, Taiheiyo Cement Co., Ltd., calcined shale fired product) 79.1 parts by mass, filler (as aggregate) Okutama Kogyo Co., Ltd., stone powder 5.3 parts by weight, asphalt (Showa Shell Sekiyu KK, straight asphalt 60/80) 7.7 parts by weight, tall oil fatty acid 6.3 parts by weight as a curing agent 1.6 parts by weight of ordinary Portland cement as an alkaline additive and a biaxial pug mill type mixer were mixed to prepare a room temperature construction type lightweight pavement composition according to Example 3.

Example 4
Pacific asanolite as aggregate (bulk density: 1.285 g / cm ³ , water absorption: 13.2%, Taiheiyo Cement Co., Ltd., calcined shale fired product) 78.8 parts by mass, filler (Okutama) Industrial Co., Ltd., stone powder 5.6 parts by mass, asphalt (Showa Shell Sekiyu KK, straight asphalt 60/80) 7.7 parts by mass, tall oil fatty acid 6.3 parts by mass as a curing agent And 1.6 parts by mass of ordinary Portland cement as an alkaline additive were mixed using a biaxial pug mill type mixer to prepare a room temperature construction type lightweight pavement composition according to Example 4.

(Example 5)
Fly clean as aggregate (bulk density: 1.464 g / cm ³ , water absorption: 23.5%, manufactured by Ochi Construction Co., Ltd., solidified fly ash) 80.0 parts by mass, filler (Okutama Kogyo Co., Ltd.) ), Stone powder) 4.4 parts by mass, asphalt (manufactured by Showa Shell Sekiyu KK, straight asphalt 60/80) 7.7 parts by mass, tall oil fatty acid 6.3 parts by mass as a curing agent, and alkaline 1.6 parts by mass of ordinary Portland cement as an additive was mixed using a biaxial pug mill type mixer to prepare a room temperature construction type lightweight pavement composition according to Example 5.

(Example 6)
Supersol (L2) as aggregate (bulk density: 0.553 g / cm ³ , water absorption: 34.9%, manufactured by Trim Co., Ltd., waste glass processed product) 54.7 parts by mass, filler (Okutama Industry) Co., Ltd., stone powder 14.1 parts by mass, asphalt (Showa Shell Sekiyu KK, straight asphalt 60/80) 15.4 parts by mass, tall oil fatty acid 12.6 parts by mass as a curing agent, Then, 3.2 parts by weight of ordinary Portland cement as an alkaline additive was mixed using a biaxial pug mill type mixer to prepare a light-weight pavement composition at room temperature according to Example 6.

(Comparative Example 1)
Narton (bulk density: 1.009 g / cm ³ , water absorption: 53.2%, manufactured by Naruto Salt Industry Co., Ltd., coal ash solidified product) 62.0 parts by mass, filler (Okutama Kogyo Co., Ltd.) ), Stone powder) 4.6 parts by weight, asphalt (manufactured by Showa Shell Sekiyu KK, straight asphalt 60/80) 16.5 parts by weight, tall oil fatty acid 13.5 parts by weight as a curing agent, and alkaline 3.4 parts by mass of ordinary Portland cement as an additive was mixed using a biaxial pug mill type mixer to prepare a room temperature construction type lightweight pavement composition according to Comparative Example 1.

(Comparative Example 2)
Miracle Sol 0.4 (non-water absorption) as aggregate (bulk density: 0.475 g / cm ³ , water absorption: 61.9%, manufactured by Nippon Construction Technology Co., Ltd., waste glass processed product) 53.9 mass Parts, filler (Okutama Kogyo Co., Ltd., stone powder) 14.9 parts by mass, asphalt (Showa Shell Sekiyu KK, straight asphalt 60/80) 15.4 parts by mass, tall oil fatty acid as a curing agent 12.6 parts by mass and 3.2 parts by mass of ordinary Portland cement as an alkaline additive were mixed using a biaxial pug mill type mixer to prepare a light-weight pavement composition for room temperature construction according to Comparative Example 2.

(Comparative Example 3)
Miracle Sol 0.4 (water absorption) as aggregate (bulk density: 0.473 g / cm ³ , water absorption: 63.1%, manufactured by Nippon Construction Technology Co., Ltd., waste glass processed product) 53.9 parts by mass , 14.9 parts by weight of filler (Okutama Kogyo Co., Ltd., stone powder), 15.4 parts by weight of asphalt (manufactured by Showa Shell Sekiyu KK, straight asphalt 60/80), tall oil fatty acid 12 as a curing agent .6 parts by mass and 3.2 parts by mass of ordinary Portland cement as an alkaline additive were mixed using a biaxial pug mill type mixer to prepare a room temperature construction type lightweight pavement composition according to Comparative Example 3.

The bulk density of each aggregate used for the preparation of each normal temperature construction type lightweight pavement composition according to Examples 1 to 6 and Comparative Examples 1 to 3 was measured by the following method.
That is, the measurement of the bulk density was performed as follows in accordance with the Japan Road Association “Pavement Survey and Test Method Handbook A001 Coarse Aggregate Density and Water Absorption Test Method”.
The amount of sample aggregate used in the test is the amount expressed in kilograms of 0.1 times its maximum dimension (in millimeters). It is thoroughly washed with water and absorbed in water at 20 ° C. ± 2 ° C. for 24 hours. After that, drain the water and wipe away the moisture until it is dry. While the surface dry state is maintained, the air weight (B) is measured. The sample is put in a wire mesh basket, placed in water at 20 ° C. ± 5 ° C., and the weight in water (C) is measured. The aggregate taken out from the water is dried at 105 ° C. to 110 ° C. to a constant mass, cooled to room temperature, and the mass (A) is measured. The bulk density was calculated | required by following Formula using these measured values.
Bulk density = A / (BC)
[A: Mass after drying sample, B: Air mass after surface drying of sample, C: Mass in water of sample]

Moreover, the water absorption rate of each aggregate used for preparation of each normal temperature construction type lightweight pavement composition which concerns on Examples 1-6 and Comparative Examples 1-3 was measured with the following method.
That is, the water absorption rate was measured as follows in accordance with the Japan Road Association “Pavement Survey / Test Method Handbook A001 Coarse Aggregate Density and Water Absorption Test Method”.
The amount of sample aggregate used in the test is the amount expressed in kilograms of 0.1 times its maximum dimension (in millimeters). It is thoroughly washed with water and absorbed in water at 20 ° C. ± 2 ° C. for 24 hours. After that, drain the water and wipe away the moisture until it is dry. While the surface dry state is maintained, the air weight (B) is measured. Thereafter, the aggregate is dried at 105 ° C. to 110 ° C. to a constant mass, cooled to room temperature, and its mass (A) is measured. Using these measured values, the water absorption was determined by the following equation.
Water absorption rate = (B−A) / A × 100 (%)
[A: Mass after drying of sample, B: Air mass after surface drying of sample]

<Aggregate cracking>
With respect to each normal temperature construction type lightweight pavement composition according to Examples 1 to 6 and Comparative Examples 1 to 3, measurements on aggregate cracking were performed by the following method.
That is, the measurement of the crack of the aggregate was performed by observing the cross section that was cracked after the Marshall stability test was completed. The Marshall stability test was performed as follows according to the Japan Road Association “Pavement Survey and Test Method Handbook B001 Marshall Stability Test”.
About each normal temperature construction type lightweight pavement composition prepared by mixing in Examples 1 to 6 and Comparative Examples 1 to 3, the height of the specimen after compaction was 63.5 ± 1.3 mm. Weigh and place in a cylindrical mold with an inner diameter of 101.6 mm. Use a spatula etc. to strike the center 15 times and the center 10 times to round the surface. After that, water as a curing initiator was added, and both sides were compacted 50 times with a weight 4.5 kg weight ramper that freely dropped into the mold along the guide rod from a height of 45.7 cm. Cured for 7 days in a constant temperature room with 60% humidity. The specimen is removed from the mold and placed in a 60 ° C. ± 1 ° C. water bath for 30-40 minutes. The specimen is removed from the water tank, placed on the lower loading head of the Marshall stability test device, and placed on the loading device with the upper loading head covered. A load is applied to the specimen at a uniform displacement speed of 50 ± 5 mm / min. The cross section of the specimen that was cracked by loading was observed visually to determine the condition of the aggregate cracking. The judgment results are organized according to the following criteria.
○: There are few cracks of the aggregate.
Δ: Aggregate cracks a little.
X: Most of the aggregate is cracked.
In this measurement, “impossible to measure” means that the measurement could not be performed because the specimen collapsed during 60 ° C. water immersion and the test was impossible.
The measurement results are shown in Table 1 below.

<Stability>
Stability was measured by the following method with respect to each normal temperature construction type light pavement composition according to Examples 1 to 6 and Comparative Examples 1 to 3.
That is, the stability was measured according to the Japan Road Association “Pavement Survey / Test Method Handbook B001 Marshall Stability Test Method” as follows.
About each normal temperature construction type lightweight pavement composition prepared by mixing in Examples 1 to 6 and Comparative Examples 1 to 3, the height of the specimen after compaction was 63.5 ± 1.3 mm. Weigh and place in a cylindrical mold with an inner diameter of 101.6 mm. Use a spatula etc. to strike the center 15 times and the center 10 times to round the surface. After that, water as a curing initiator was added, and both sides were compacted 50 times with a weight 4.5 kg weight ramper that freely dropped into the mold along the guide rod from a height of 45.7 cm. Cured for 7 days in a constant temperature room with 60% humidity. The specimen is removed from the mold and placed in a 60 ° C. ± 1 ° C. water bath for 30-40 minutes. The specimen is removed from the water tank, placed on the lower loading head of the Marshall stability test device, and placed on the loading device with the upper loading head covered. A load is applied to the specimen at a uniform displacement speed of 50 ± 5 mm / min. Read the value when the maximum load is reached. The results are shown as stability with the maximum load in kN units.
In this measurement, “impossible to measure” means that the measurement could not be performed because the specimen collapsed during 60 ° C. water immersion and the test was impossible.
The measurement results are shown in Table 1 below.

<Workability>
The workability was evaluated by the following methods for each room temperature construction type lightweight pavement composition according to Examples 1 to 6 and Comparative Examples 1 to 3.
That is, with respect to each normal temperature construction type lightweight pavement composition prepared by mixing according to Examples 1 to 6 and Comparative Examples 1 to 3, a scoop or spatula was used at the time of specimen preparation in each test after 1 day from immediately after its production. It was determined whether or not it was possible to easily disentangle it by using the above method. The judgment results are organized according to the following criteria.
○: Can be easily cracked.
Δ: Although some lumps are seen, they can be loosened.
X: There are many lumps or the whole is hardened and cannot be easily disentangled.
The evaluation results are shown in Table 1 below.

<Deformation amount of road surface shape (DS)>
The deformation amount (DS) of the road surface shape was measured by the following method for each room temperature construction type light pavement composition according to Examples 1 to 6 and Comparative Examples 1 to 3.
That is, DS was measured according to the Japan Road Association “Pavement Survey / Test Method Handbook B003 Wheel Tracking Test Method” as follows.
About each normal temperature construction type light-weight pavement material composition prepared by mixing in Examples 1 to 6 and Comparative Examples 1 to 3, the finished specimen dimensions are 300 mm in length, 300 mm in width, and 50 mm in thickness. A normal temperature construction type light pavement composition having a mass corresponding to a target density (here, a density obtained by a Marshall stability test) is weighed in a frame. Put it in about half the formwork, poke the four corners with a scoop, level it flat, and gently press it with a spatula. Then, the rest is put evenly in the four corners of the mold, and the four corners are struck from the diagonally upward to the corners about 5 times with a spatula or the like. Then, it is pushed and hardened with a spatula or the like along the mold. After surface shaping with the back of a spatula or the like, water as a curing initiator is added, and preliminary rolling is performed with a vibration tamper or the like. The roller compactor performs 5 reciprocating rollings at a linear pressure of 29.4 kN / m. After that, it is compacted so that the compaction degree is 100 ± 1% of the reference density determined by the Marshall stability test. Cured for 7 days in a constant temperature room at 20 ° C and 60% humidity. The specimen is transferred to a test form and fixed, and then cured in a thermostatic chamber maintained at 60 ± 2 ° C. at least 5 hours before the start of the test. The central portion is set as the travel position, and the vehicle travels straight at a traveling wheel load of 686 ± 10N. At that time, the traveling direction is made to coincide with the rolling direction. The deformation is measured by reading the dial gauge when it first passes through the center as the origin, and reading the values at 45 minutes and 60 minutes from the start of the measurement according to the shape of the deformation curve. DS was calculated | required by following Formula using these measured values.
DS (dynamic stability: times / mm) = 42 × (t ₂ −t ₁ ) / (d ₂ −d ₁ )
[T ₁ : 45 minutes, t ₂ : 60 minutes, d ₁ : deformation (mm) at 45 minutes, d ₂ : deformation (mm) at 60 minutes]
In this measurement, “unmeasurable” means that the measurement could not be performed due to the significant deformation.
The measurement results are shown in Table 1 below.

As shown in Table 1 above, each of the normal temperature construction type lightweight pavement compositions according to Examples 1 to 6 is lightweight but rich in workability and has the strength and durability necessary for road pavement use. While being able to improve, each normal temperature construction type light pavement composition according to Comparative Examples 1 to 3 is rich in workability and can improve the strength and durability required for road pavement applications. There wasn't.
That is, in each normal temperature construction type lightweight pavement composition according to Comparative Examples 1 to 3, sufficient strength is not expressed so that the cracking and stability of the aggregate cannot be measured, and workability is poor. Furthermore, although the amount of deformation (DS) of the road surface shape could not be measured, the results were poor in strength and durability, but in each room temperature construction type lightweight pavement composition according to Examples 1 to 6, There was no such a thing, and the results were able to withstand practical use.

Especially, in each normal temperature construction type lightweight pavement composition which concerns on Examples 1-6, compared with the normal temperature construction type lightweight pavement composition which concerns on Example 1 whose water absorption rate of aggregate is less than 5%, Each normal temperature construction type light pavement composition according to Examples 2 to 4 having a water absorption rate of 5% to 20% has less aggregate cracking and greatly reduces the amount of deformation (DS) of the road surface shape. Compared with each normal temperature construction type light pavement composition according to Examples 5 and 6 in which the water absorption rate of the aggregate exceeds 20%, the aggregate water absorption rate is 5% to 20%. Each normal temperature construction type light pavement composition according to Examples 2 to 4 has less cracking of aggregate, greatly improves stability, improves workability, and the amount of deformation of the road surface shape (DS) Can be greatly reduced.
Therefore, the water absorption rate of the aggregate is particularly preferably 5% to 20%.
In addition, although each room temperature construction type lightweight pavement composition according to Examples 2 and 4 has a lower stability than the room temperature construction type light pavement composition according to Example 1, in general, 9. If it is 0 or more, it is necessary and sufficient.

Here, the penetration | invasion condition of the hardening | curing agent with respect to the aggregate in the normal temperature construction type lightweight pavement composition of this invention, an alkaline additive, etc. is demonstrated using FIG.
FIG. 1 is a photomicrograph of an image of the penetration of a curing agent, an alkali additive, and the like into an aggregate of a room temperature construction type lightweight pavement composition according to Example 3. FIG. 2 is a photomicrograph of only the aggregates used in the room temperature construction type lightweight pavement composition according to Example 3.
These microphotographs are imaged using a fluorescent microscope (Nikon, ECLIPSE TE2000-U) and filter blocking, so that the curing agent, the alkali additive, etc. are imaged brightly and the aggregate is imaged darkly. Has been set.
As shown in FIGS. 1 and 2, unlike the case of only aggregates that do not use a curing agent, an alkaline additive, etc., the room temperature construction type lightweight pavement composition according to Example 3 has a curing agent, an alkaline additive, etc. Is coated on the surface of the porous aggregate particles and penetrates into the aggregate particles.

  As described above, the light-weight pavement composition of ordinary temperature construction type of the present invention is lightweight, rich in workability, and excellent in strength and durability, so that it can be widely used in the field of asphalt pavement. it can. In particular, it can be suitably used for repairing potholes and the like.

Claims (3)

In a room temperature construction type lightweight pavement composition containing an aggregate, an asphalt, a hardener containing any of fats and oils, and an alkaline additive that saponifies with the hardener by adding a curing initiator,
The aggregate has a bulk density of ^{0.5g / cm 3 ~1.9g / cm 3} , and cold construction type lightweight paving composition, wherein the water absorption is 2% to 35%. Cold construction type lightweight paving composition of claim 1 bulk density of the aggregate is ^{1.0g / cm 3 ~1.6g / cm 3} .   The composition for lightweight pavement construction at room temperature according to any one of claims 1 to 2, wherein the aggregate has a water absorption of 5% to 20%.