Classifications

• • E—FIXED CONSTRUCTIONS
  • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
  • E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
  • E01C7/00—Coherent pavings made in situ
  • E01C7/08—Coherent pavings made in situ made of road-metal and binders
  • E01C7/30—Coherent pavings made in situ made of road-metal and binders of road-metal and other binders, e.g. synthetic material, i.e. resin
• • C—CHEMISTRY; METALLURGY
  • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
  • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
  • C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
  • C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L91/00—Compositions of oils, fats or waxes; Compositions of derivatives thereof
• • E—FIXED CONSTRUCTIONS
  • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
  • E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
  • E01C7/00—Coherent pavings made in situ
  • E01C7/08—Coherent pavings made in situ made of road-metal and binders
  • E01C7/18—Coherent pavings made in situ made of road-metal and binders of road-metal and bituminous binders
• • C—CHEMISTRY; METALLURGY
  • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
  • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
  • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
  • C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
  • C04B2111/0075—Uses not provided for elsewhere in C04B2111/00 for road construction

Definitions

• the present invention relates to a room temperature asphalt mixture used for road pavement and the like.
• normal temperature asphalt mixture that can be constructed at room temperature at the construction site has been used for temporary restoration of paved roads due to excavation of buried pipes under roads and repair of damaged parts that occur locally on existing paved roads.
• This kind of room temperature asphalt mixture has the advantage that it can be packed in a bag, spread at room temperature at the construction site, and compacted, but it is less durable than a normal heated asphalt mixture. It has the problem that it cannot be used for a long period of time. In particular, this room temperature asphalt mixture can be used only for a short period of time on a construction site with a large amount of traffic, a pavement surface that is repeatedly vibrated, or a pavement surface on a floor slab with a large amount of deflection.
• a room temperature asphalt mixture capable of developing strength in a short time by using a reactive substance.
• a room temperature asphalt mixture includes at least an aggregate (for example, crushed stone, crushed sand, fine sand, stone powder, etc.), asphalt, and a lubricating solidifying agent (fatty acid and / or fatty acid dimer and / or fatty acid). It is composed of a mixture of (3) and an alkaline additive (cement), and has been used to improve the strength, durability, and deflection followability of pavements constructed using this.
• Various proposals have been made.
• palmitic acid is 1 to 15% by weight
• stearic acid is 0.3 to 10% by weight
• oleic acid is 39 to 59% by weight
• linoleic acid is 20 to 48% by weight
• linolenic acid is 1.
• Proposals have been made to use a lubricating solidifying material containing up to 15% by weight.
• Patent Document 2 proposes the use of a lubricating solidifying material containing a saturated fatty acid having 6 to 30 carbon atoms in a proportion of 50 to 100% by weight.
• Patent Document 3 an organic acid polymer having two or more carboxyl and / or sulfo groups in the side chain is used, and a reactive resin material containing at least divalent or higher metal ions is used as an alkaline additive (cement). Proposals have been made. According to this room temperature asphalt mixture, the reactive resin material and the alkaline additive are crosslinked and / or polymerized by water to form an ionomer, thereby imparting strength and deflection followability to the pavement.
• cement alkaline additive
• Patent Document 4 a fatty acid containing oleic acid and linoleic acid is used, and the content of linoleic acid is set to a value larger than 50% by weight with respect to the total weight of the oleic acid and linoleic acid. Proposals have been made.
• the room temperature asphalt mixture proposed in Patent Documents 1 to 4 has a good balance between flow resistance, aggregate scattering resistance, deflection followability and workability at low temperature, and is a property improving agent. Also has the problem of being expensive.
• the property-improving agent which is a petroleum-lubricating oil-based liquid proposed in Patent Document 4
• the fatty acid pitch which is an industrial by-product in fatty acid production. Therefore, the room temperature asphalt mixture containing such an expensive property improving agent has a problem in terms of economy.
• the present invention has been made in view of the above problems, and an object of the present invention is to provide a room temperature asphalt mixture excellent in balance between flow resistance, aggregate scattering resistance, deflection followability and low temperature workability, and economical efficiency. It is in.
• the present invention relates to at least an aggregate, asphalt, a property improving agent which is a plant-derived oil component, and a lubricating solidifying agent (fatty acid and / or fatty acid dimer and / or fatty acid).
• a property improving agent which is a plant-derived oil component
• a lubricating solidifying agent fatty acid and / or fatty acid dimer and / or fatty acid.
• It is a room temperature asphalt mixture composed of a mixture of (trimer) and cement, and is characterized in that the ratio of the property improving agent: the lubricating solidifying agent is set in the range of 40:60 to 5:95.
• the recycled aggregate may be further mixed with the above-mentioned room temperature asphalt mixture.
• the property improving agent has a fatty acid pitch.
• the ratio of the property improving agent: the lubricating solidifying agent in the range of 40:60 to 5:95, the flow resistance, the aggregate scattering resistance, and the deflection followability of the normal temperature asphalt mixture are set. It was experimentally confirmed that a good balance was established between the workability and low temperature workability. Further, by using an inexpensive fatty acid pitch, which is an industrial by-product in fatty acid production, as a property improving agent, the cost of the room temperature asphalt mixture can be kept low and it is economical.
• the room temperature asphalt mixture according to the present invention is a repair material that is hardened by watering it at room temperature to form an asphalt pavement, and is basically an aggregate and a property improving agent that is an oil component derived from a plant. It is composed of a mixture of a lubricating solidifying agent and cement.
• Table 1 shows an example of the mixing ratio of various substances constituting this normal temperature asphalt mixture.
• the aggregates contained in the asphalt mixture according to the present embodiment include No. 7 crushed stone (maximum particle size 5 mm) of 43.0%, crushed sand of 24.0%, and fine sand of 28. 0% and 5.0% stone powder are used.
• the grain size of the aggregate can be adjusted by using No. 6 crushed stone (maximum particle size 13 mm), No. 5 crushed stone (maximum particle size 20 mm), etc., depending on the type of the existing pavement.
• the fatty acid as a lubricating solidifying agent and the fatty acid pitch as a property improving agent constitute a plasticizer mixture, and this fatty acid mixture and asphalt form a binder.
• the blending ratio of asphalt in the binder is set to 56.1%, and the blending ratio of the plasticizer mixture is set to 43.90%.
• the plasticizer mixture contains a fatty acid and a fatty acid pitch which is a property improving agent.
• Straight asphalt (St. As. 60/80) is used as the asphalt, and when selecting the asphalt, an appropriate one can be appropriately selected in consideration of the peelability of the aggregate.
• Decolorized asphalt or the like can also be used depending on the conditions of the construction site.
• ordinary cement is used as the cement as an alkaline additive to be added externally.
• Table 1 shows the compounding ratio of each mixture when the total of various mixtures excluding cement as an external additive is 100%.
• the compounding ratio of No. 7 crushed stone, crushed sand, fine sand, and stone powder in the aggregate is shown in Table 1.
• the blending ratio of the binder was 6.5%, of which the asphalt was 3.65%, the lubricating solidifying agent was 2.14%, and the property improving agent was 0.71%. There is. In this case, 0.8% cement is added externally.
• the plasticizer mixture contains a lubricating solidifying agent and a property improving agent
• Table 2 shows the types and blending ratios of the lubricating solidifying agent and the property improving agent.
• TFA-145WF (model number) manufactured by Tsukino Food Industry Co., Ltd. was used as the fatty acid.
• fatty acid pitch which is a plant-derived oil component, was used as a property improving agent. This fatty acid pitch is an industrial by-product (residue) in fatty acid production.
• a fatty acid pitch specially examined (formally referred to as “TFA-B60” in Table 2) was used.
• the fatty acid pitch: fatty acid ratio in the room temperature asphalt mixture is set to 25:75 (displayed as "Example 1" in Table 2).
• Example 1 the case where 100% fatty acid (TFA-145WF) is used without using the property improving agent is referred to as “Comparative Example 1”
• mineral oil mineral oil (aroma type) is specifically used as the property improving agent.
• “Comparative Example 2” was defined as the case where the fatty acid: mineral oil ratio was set to 75:25 using Reseicool Super (trade name), which is an additive for regeneration manufactured by Santoku Shoji Co., Ltd. Further, the case where vegetable oil (waste edible oil as a recycled product) was used as a property improving agent and the ratio of fatty acid: vegetable oil was set to 75:25 was referred to as "Comparative Example 3".
• the fatty acid pitch used as a property improving agent in the room temperature asphalt mixture according to the present embodiment (“Example 1” in Table 2) is a mineral conventionally used because it is an industrial by-product (residue).
• oil mineral oil
• it also has advantages as a biomass material over petroleum-derived materials (for example, in terms of renewable resources and in terms of saving petroleum resources).
• properties high fluidity resistance, aggregate scattering resistance and deflection followability can be ensured for the normal temperature asphalt mixture, and low temperature workability can be improved, and a good balance is achieved between them. It was demonstrated in various tests described below that it was preserved.
• Bending test is mentioned as a test item for bending followability.
• water at a temperature of 20 ° C. is sprayed to prepare a test piece, and the test piece is cured and cured at a temperature of 20 ° C. for 7 days.
• the test was performed at a test temperature of ⁇ 10 ° C.
• ⁇ (good) if (bending strain ⁇ 10 -3 ) was 4 or more, ⁇ (possible) if it was 3 to 4, and ⁇ (impossible) if it was less than 3.
• Aggregate scattering resistance As a test item for aggregate scattering resistance, a 20 ° C. cantabulo test is mentioned. In this 20 ° C. cantabulo test, water is sprayed at a temperature of 20 ° C. and pressure is applied 50 times on both sides, and after demolding, the temperature is 20 ° C. for 24 hours. Was cured and cured, and the test was conducted at a temperature of 20 ° C. As a result of this 20 ° C. cantabulo test, it was judged as ⁇ (good) if the loss rate was less than 10%, ⁇ (possible) if it was 10 to 20%, and ⁇ (impossible) if it was 20% or more.
• a wheel tracking test is one of the test items for flow resistance.
• water at a temperature of 20 ° C. is sprayed to prepare a specimen, and the specimen is prepared at a temperature of 20 ° C. for 7 days. Was cured and cured, and the test was conducted at a temperature of 60 ° C.
• the dynamic stability is 3000 times / mm or more, it is ⁇ (good), if it is 1000 to 3000 times / mm, it is ⁇ (possible), and if it is less than 1000 times / mm, it is ⁇ (impossible). ).
• the pour point (° C.) of the above is shown in Table 4 for Example 1 and Comparative Examples 1 to 3 shown in Table 2.
• Example 1 in which a fatty acid and a fatty acid pitch were used in combination as a plasticizer, the deflection followability (bending strain) and the deflection followability (bending strain) were improved as compared with Comparative Example 1 in which only the fatty acid was used alone.
• the aggregate scattering resistance (20 ° C. cantablo loss rate) is improved, and the pour point (workability at low temperature) of the plasticizer component of asphalt, which is an index of the workability of the normal temperature asphalt mixture, is also improved.
• Example 1 although the flow resistance (dynamic stability) is lower than that of Comparative Example 1, it is a standard for the number of plastically deformed wheels on a road with a planned pavement traffic volume of 3000 vehicles / day or more. Satisfied with the value.
• Example 1 has a better balance of trade-offs than Comparative Example 2 in which mineral oil is used instead of fatty acid pitch and Comparative Example 3 in which vegetable oil is used.
• Example 1 As a result of the above, it can be confirmed that the fatty acid pitch used in Example 1 is superior in the effect of the property improving agent among the oil components.
• the room temperature asphalt mixture according to the present embodiment uses an inexpensive fatty acid pitch as an industrial by-product (residue) in fatty acid production as a property improving agent, and the fatty acid: fatty acid pitch ratio is set to 75:25. This has the effect of improving low-temperature workability and economic efficiency while maintaining high flow resistance, aggregate scattering resistance, and deflection followability.
• low temperature workability can be improved by adopting a combination of fatty acid + fatty acid pitch (vegetable oil) as a plasticizer. That is, it was found that the temperature varies depending on the composition, but the fatty acid alone develops crystallinity and solidifies when the temperature drops below a certain temperature. Therefore, it was confirmed that when a material such as vegetable oil or mineral oil, which is difficult to crystallize and has a low melting point, is mixed, it inhibits the crystallization of fatty acids and lowers the freezing point.
• fatty acid + fatty acid pitch vegetable oil
• the fatty acid: fatty acid pitch ratio is set to 75:25, but if this ratio is set to the range of 40:60 to 5:95, the same effect as described above can be obtained. confirmed.
• the regenerated aggregate obtained by crushing and classifying the generated material of asphalt pavement may be partially replaced with the crushed stone or sand shown in Table 1, and thus the regenerated aggregate may be used.

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• Chemical & Material Sciences (AREA)
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• 2020
  • 2020-10-02 WO PCT/JP2020/037512 patent/WO2022070398A1/ja not_active Ceased
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