JPH0874220A - Bituminous additive for paving body having draining and water-permeable function, asphalt paving component having draining and water-permeable function using the same and manufacture thereof - Google Patents

Abstract

PURPOSE: To improve the durability of an asphalt pavement by forming a bituminous additive for a paving body of aliphatic monophosphoric acid ester having a specified range of carbonic number and aliphatic diphosphoric acid ester having a specified range of carbonic number. CONSTITUTION: A bituminous additive for a paving body having a drainage or a water permeable function is composed of straight chain or branched chain saturated or unsaturated aliphatic monophosphoric acid ester A having a carbonic number of 16-18 and straight chain or branched chain saturated or unsaturated aliphatic diphosphoric ester B having a carbonic number of 16-18, and A/(A +B)×100(mol%) is made a ratio of composition of 40-95. This additive is made 0.05-5.0weight%, favourably 0.1-3.0weight% of this additive against asphalt used for the paving body having the draining or the water-permeable function and added to heated asphalt. An asphalt paving component is manufactured by kneading the sufficiently mixed asphalt mixture with crushed stones, sand and a filler.

Description

Detailed Description of the Invention

[0001]

The present invention relates to so-called drainage, which is composed of a specific acidic organic phosphoric acid compound and has a water permeability of 10 ^-2 cm / sec or more as described in the asphalt pavement summary (published by the Japan Road Association). Which relates to a bituminous additive used for a pavement composition object having a water-permeable or water-permeable function, an asphalt pavement composition using the same, and a method for producing the same, more specifically, the adhesion between the bituminous material and the aggregate. To strengthen the
As a result, the present invention relates to a bituminous additive capable of exhibiting an extremely excellent exfoliation prevention effect in bituminous matter, an asphalt pavement composition using the same, and a method for producing the same.

[0002]

BACKGROUND OF THE INVENTION Drainage pavement or permeable pavement is a pavement construction method in which an asphalt mixture with large voids is used in the surface layer of the pavement, and rainwater staying on the surface is stored and flows down into the pavement. Is.

As a function of drainage pavement, prevention of hydroplaning phenomenon in rainy weather, smoking light reflection,
It is directly linked to traffic safety, environmental measures, and improvement of service level, such as reduction of water splash and rolling noise due to tire running, and there are great expectations for development and introduction.

By the way, since the bituminous substance is non-polar, the adhesion to the aggregate is not sufficient, and there is a potential defect that the bituminous substance is separated from the aggregate due to the intervening action of water such as precipitation and groundwater. In the past, when used in pavements, care was taken at the time of implementation to minimize the porosity so that water would not penetrate.

However, in the drainage pavement or water permeable pavement construction method, voids are positively utilized, and the adhesiveness between the aggregate and the bituminous substance tends to be further lowered.

[0006] Further, the asphalt for drainage pavement which is generally commercially available is called a high-viscosity binder, and is designed so that a thermoplastic resin or rubber is mixed in the asphalt and the fluidization phenomenon does not easily occur. There is. As a result, the adhesiveness at the interface between the asphalt and the aggregate is reduced, and peeling is more likely to occur.

Thus, the technical problem of improving the adhesion between the bituminous material and the aggregate is a very important problem for improving the performance of the asphalt pavement, and various methods have been devised for solving the problem. For example, according to Japanese Examined Patent Publication No. 55-38993, higher aliphatic polyamines and their derivatives are used as a countermeasure for this, but the higher aliphatic polyamines and their derivatives that have been devised conventionally have improved initial adhesion improving performance. However, the durability of the effect of preventing peeling is said to be about one year.

Further, Japanese Patent Application Laid-Open No. 57-51745 proposes a method of adding a silane compound to improve the adhesion performance. However, it is harmful when it is added to a heated bituminous material or during the production of a heated mixture. It emits various odors and steam and leaves a problem in terms of safety and hygiene, and it is neither economical nor practical.

Furthermore, a composition obtained by adding and mixing a phosphoric acid compound such as phosphorus pentoxide, polyphosphoric acid and phosphorus pentasulfide to asphalt is used as an asphalt modifying additive.
Although disclosed and proposed in Japanese Patent No. 3691, these phosphoric acid compounds are inorganic substances and their dispersion state in an organic substance is not always good, and the adhesion performance of asphalt to an aggregate is insufficient.

Japanese Patent Application Laid-Open No. 60-188462 describes that an acidic organic phosphoric acid compound has an anti-peeling effect, but under the present circumstances, the level of the anti-peeling requirement for asphalt mixtures having a large porosity is increasing. However, the performance is insufficient to satisfy these requirements, and development of an additive having further peeling prevention performance is desired.

[0011]

[Means for Solving the Problems] The present inventors have found that the permeability coefficient described in the asphalt pavement summary (published by the Japan Road Association)
As a result of diligent efforts to exert an excellent peeling-preventing effect on a pavement composition object having a so-called drainage property or a water-permeable function, which has a concentration of 10 ^-2 cm / sec or more, a specific acidic organic phosphate compound is particularly excellent. The inventors have found that they have the ability to exert a peeling prevention effect and have completed the present invention.

That is, according to the present invention, a straight chain or branched chain saturated or unsaturated aliphatic monophosphate ester (A) having 16 to 18 carbon atoms and a straight chain or branched chain saturated or unsaturated group having 16 to 18 carbon atoms are used. Consisting of saturated aliphatic diphosphate ester (B), A /
(A + B) × 100 (mol%) 40 to 95 The present invention relates to a bituminous additive for pavement having drainage or water permeability.

In the present invention, 3 to 10 parts by weight of an asphalt mixture prepared by adding 0.05 to 5 parts by weight of the above additives to 100 parts by weight of asphalt, and aggregates 97 to 90 composed of crushed stone, sand and filler are used. The present invention relates to an asphalt pavement composition having a drainage property or a water permeability function, which is characterized by comprising:

Further, according to the present invention, the asphalt pavement composition having the above drainage property or water permeability function is characterized by kneading the asphalt mixture obtained by previously adding the above additives to the asphalt and the aggregate. Regarding the method.

The additive of the present invention may be a single acidic organic phosphoric acid compound or a mixture of a plurality of acidic organic phosphoric acid compounds.

Conventionally devised higher aliphatic polyamines and their derivatives are adsorbed and oriented in polar positive and negative polar groups,
Improves wetting between bituminous material and aggregate. However, it is effective for initial adhesion, but has a problem for long-term adhesion. For example, when external stress such as temperature rise and dynamic load is applied in the presence of water for a long period of time, since the additive itself is a surfactant, it acts as a bituminous emulsifier and removes bitumen from the aggregate. There is a drawback that

The present invention has a composition in which the molecules are arranged most densely at the interface between the bituminous material and the aggregate, and further, as shown in the following reaction formula, a chemical bond is formed at the interface by a dehydration reaction to strengthen the structure. Since it adheres and the acidic organic phosphoric acid compound itself is polymerized to form a strong hydrophobic film on the aggregate surface, even if water enters the aggregate surface, it does not replace the bituminous material and shocks. It is considered that even if it is received, it exhibits an excellent peeling-preventing effect without breaking the adhesive interface between the aggregate and the bituminous substance.

[0018]

Embedded image

In order to form an optimal adhesive interface that is dense in terms of molecular structure and arrangement, a linear or branched saturated or unsaturated aliphatic monophosphate ester (A) having 16 to 18 carbon atoms and 16 carbon atoms are used. -18 linear or branched saturated or unsaturated aliphatic diphosphate ester (B), and A / (A + B) x 1
It is important that the composition ratio of 00 (mol%) is 40 to 95, and it is difficult to obtain such a dense molecular arrangement and chemical bond even if the monophosphate ratio is less than 40 or more than 95. The peeling prevention performance is insufficient. More preferably, A / (A + B) × 100 (mol%) is 60 to 90.

The values of A and B used here can be obtained by the following analysis method for acidic organic phosphoric acid compounds (for example, the method described in JP-B-58-8746). That is, 1 g of the product was subjected to potentiometric titration with an alkali by a conventional method to obtain the amount of alkali (amg) required up to the first equivalence point and the amount of alkali (bmg) required up to the second equivalence point. After adding the acidic phosphate OH groups present in and the silver nitrate in a chemical equivalent or more, potentiometric titration with alkali was performed in the same manner to obtain the alkali amount (cmg) required up to the 3rd equivalence point. Calculate the content.

[0021]

[Equation 1]

The acidic organic phosphoric acid compound in the present invention is
The phosphorylating agent is not limited to these substances, and examples thereof include phosphorus pentoxide (P ₂ O ₅ ), phosphorus oxytrichloride (P ₂ O ₅ ).
OCl _3), phosphorus trichloride (PCl _3), such as using a polyphosphoric acid and as alcohol starting material, an alcohol, saturated or unsaturated straight-chain or branched-chain having 16 to 18 carbon atoms is used, for example, cetyl alcohol , Stearyl alcohol, oleyl alcohol, Guerbet alcohol and the like. An acidic organic phosphoric acid compound having a predetermined ester composition ratio can be obtained by the kind of phosphorylating agent used here, the molar ratio of alcohol to phosphorylating agent, addition of water, and the like.

The acidic organic phosphoric acid compound of the present invention is an alcohol having different carbon numbers from the viewpoint of synthetic raw materials (for example, Kao Corporation).
(Calcoal series) may be mixed, but it is desirable to use it as an alcohol raw material containing 70% by weight or more of an alcohol having 16 to 18 carbon atoms, and when unreacted alcohol is mixed depending on the synthesis conditions. However, there is no problem in performance and it is included in the scope of the present invention.

The additive of the present invention is used in an amount of 0.05 to 0.05 with respect to asphalt used in a pavement having drainage or water permeability.
It is 5.0% by weight, preferably 0.1 to 3.0% by weight. 0.05
If it is less than 5% by weight, the effect is reduced, and if it exceeds 5.0% by weight, it is effective but not economical.

The crushed stone, sand, and filler used in the asphalt pavement composition having a drainage property or a water permeability function of the present invention are irrespective of the material as long as they are in accordance with the asphalt pavement guideline (edited by Japan Road Association). Can be used in the present invention. The compounding ratio of the aggregate composed of crushed stone, sand and filler is preferably 3 to 10 parts by weight of the asphalt compound containing the additive of the present invention and 97 to 90 parts by weight of the aggregate.

The asphalt pavement composition having a drainage or water permeability function of the present invention is prepared by adding the additive of the present invention to asphalt which has been heated in the range of 120 to 220 ° C. and thoroughly mixing it with crushed stone, sand, It is characterized by being manufactured by kneading and a filler. During the production of the asphalt pavement composition having drainage or water permeability function of the present invention, by adding the additive of the present invention to pre-heated asphalt, the additive of the present invention is uniformly dispersed in the asphalt, a homogeneous An asphalt pavement composition having excellent drainage or water permeability is obtained. If the additive of the present invention is mixed in advance with crushed stone, sand, a filler, etc., a localized and homogeneous asphalt pavement composition cannot be obtained.

In order to achieve the object of the present invention better, various aliphatic amines may be used in combination with the acidic organic phosphoric acid compound of the present invention. This means that the initial wetting is further enhanced by having a nitrogen atom in the molecule. The amines are not particularly limited, but as general ones, higher aliphatic polyamines such as beef tallow propylenediamine and derivatives thereof, alkylhydroxyamines, monoethanolamine, diethanolamine, triethanolamine and other alkylolamines, etc. However, it is preferably used on the neutral or acidic side. The various aliphatic amines used in combination with the acidic organic phosphoric acid compound of the present invention are not limited to these.

In the present invention, the bituminous substances to which the acidic organic phosphate compound is added include petroleum slate asphalt, modified asphalt, high-viscosity asphalt for drainage pavement, semi-prone asphalt, cut pack asphalt, natural asphalt, petroleum tar, pitch. Alternatively, there may be mentioned asphalt produced by adding a softening agent to the bituminous material produced from solvent deasphalting so as to meet the specifications of asphalt for paving.

[0029]

EXAMPLES The present invention will be specifically described below, but the present invention is not limited to these examples. In addition, "%" in the following examples is "% by weight".

In order to confirm the effects of the present invention, a water immersion Marshall test was carried out. The water immersion marshalling test was in accordance with the test method KODAN202 “Marshalling test method for asphalt mixture” of the Japan Highway Public Corporation. However, the water immersion temperature of the test piece was raised from 60 ° C to 80 ° C, and the water immersion time of the test piece was increased from 48 hours to 96 hours, and the test was performed under more severe conditions.

The test is carried out by the Marshall stability test method (ASTM D
1559-65, Asphalt Pavement Guideline, Appendix 4.10). The types of asphalt mixture used in this test are those shown in the asphalt mixture for drainage pavement (asphalt pavement summary (published by Japan Road Association)), and the materials shown in Table 1 were used. The test asphalt pavement composition test pieces were prepared by dissolving asphalt under heating at 180 to 220 ° C, preparing the asphalt mixture by adding the additive of the present invention according to the conditions, and then heating at 180 to 220 ° C as shown in Table 1. It was prepared by kneading with the materials. The preparation conditions for the mixture are as follows: mixing temperature 180-220 ℃, compaction temperature 180-200 ℃
I went there. Ten specimens (10 cm in diameter and about 6.3 cm in thickness) were made, 5 of which were subjected to the standard Marshall test, and the remaining 5 were soaked in an 80 ° C constant temperature water bath for 96 hours. , The Marshall stability of the specimen was obtained. Residual stability by the water immersion Marshall test was calculated from the following formula.

[0032]

[Equation 2]

[0033]

[Table 1]

Examples 1-10 and Comparative Examples 1-8 Sample asphalt was prepared by mixing various additives shown in Table 2. The results of the water immersion marshall test are shown in Table 2.

Reference Example 1 An asphalt mixture for drainage pavement was compared with a normal dense particle size asphalt mixture (13) (asphalt pavement summary, published by Japan Road Association). The same materials as in Table 1 were used, and the compounding ratio was changed so that the dense particle size asphalt mixture (13) described in the asphalt pavement guideline was obtained. The results of the water immersion marshall test are shown in Table 2. The hydraulic conductivity of the mixture was 0.7 × 10 ^-2 cm / sec.

Reference Example 2 The procedure of Reference Example 1 was repeated except that the additives shown in Table 2 were mixed in the sample asphalt. Table 2 shows the results of the water immersion marshall test.
It was shown to. The hydraulic conductivity of the mixture was 0.7 × 10 ^-2 cm / sec.

[0037]

[Table 2]

[0038]

As shown in Reference Example 1, the dense particle size asphalt mixture (13) is not required to have peeling prevention measures,
As shown in Comparative Example 1, when the asphalt mixture for drainage paving was blended, the porosity was increased, and as a result, the permeation rate of the water into the mixture was increased and the adhesion between the asphalt and the aggregate was decreased. , The residual stability is significantly reduced. From the examples, drainage pavement asphalt mixture using the pavement bituminous additive having drainage or water permeability function of the present invention, adhesion of asphalt and aggregate even when water penetrates into the mixture The residual stability was high due to the improved rate. From the above, it is clear that by using the additive of the present invention, the peeling-preventing effect is remarkably improved and the durability is improved. This additive enables the development of new pavement technology having drainage or water permeability function and improving the durability of asphalt pavement is expected to have great advantages not only in terms of total cost but also in terms of environment. The ripple effect is great.

Claims (4)

[Claims] 1. A linear or branched, saturated or unsaturated aliphatic monophosphate ester (A) having 16 to 18 carbon atoms and 16 carbon atoms.
-18 linear or branched saturated or unsaturated aliphatic diphosphate ester (B), A / (A + B) x 100
(Mole%) is 40 to 95, and an additive for bituminous substances for pavements having a drainage property or a water permeability function. 2. The phosphoric acid ester is a phosphoric acid ester of cetyl alcohol or stearyl alcohol.
Additives for bituminous materials for pavements having the described drainage or water permeability function. 3. An aggregate containing 3 to 10 parts by weight of an asphalt mixture prepared by adding 0.05 to 5 parts by weight of the additive according to claim 1 to 100 parts by weight of asphalt, and crushed stone, sand and a filler. An asphalt pavement composition having a drainage property or a water permeability function, which comprises 90 parts by weight. 4. An asphalt pavement having a drainage or water permeability function according to claim 3, wherein the asphalt mixture in which the additive according to claim 1 or 2 is added to the asphalt in advance is kneaded. A method for producing a composition.