JPS60180949A - Cement bitumen formed matter for pavement - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a paving cement molded into a plate shape, block shape, etc., suitable for paving roads, sidewalks, bicycle paths, plazas, factory premises, railway platforms, pavements, etc. This invention relates to bituminous moldings.

For bituminous pavements, heated asphalt mixture pavements (e.g.
Askuald concrete pavement) is widely used. Compared to bituminous pavement that is constructed at room temperature, this pavement has advantages such as being able to be opened to traffic immediately after construction, being highly stable against traffic loads, and having excellent durability. If temperature control during compaction is poor, that is, if the temperature of the heated asphalt mixture falls below a temperature suitable for these operations, good construction will not be possible. In addition, during restoration work for sidewalks, underground construction, etc., narrow areas cannot be cleared, leveled, and compacted in a timely manner. In addition, there are various problems depending on the site and site, such as work being interrupted if exposed to rain or the like.

Therefore, there is a demand for the development of a pavement that uses the imperial style, does not have the difficult problems of temperature control that heated asphalt mixtures do, is not limited by the construction location, and is comparable to heated asphalt mixture pavements. has been done.

There are various bituminous emulsions such as bituminous emulsion, cutback asphalt, and paving tar that can be applied at room temperature using bituminous materials as a binder, but compared to heated asphalt mixture pavements, they require curing after construction before opening to traffic. It also had the disadvantage of being inferior in terms of durability after being opened to traffic.

The inventors of the present invention have conducted extensive research with the aim of achieving a paving system that is comparable to heated asphalt mixture pavement when applied at room temperature, and can be applied in both narrow and wide spaces. It has been found that by reinforcing the mixture by using fibers, especially long fibers, it is possible to obtain a mixture that has flexibility comparable to that of heated asphalt mixtures, is strong against impact, and has good durability. However, depending on the construction location, on-site construction may make quality control difficult. From such a thing,
When we researched molded products that could be molded and hardened into blocks, plates, etc. and laid down for construction, we found that compared to on-site construction, we were able to obtain a product with more stable quality and better physical properties, and it could be constructed in the same way as concrete blocks. It was also found that various construction methods can be used. For example, nail drilling can be done, blocks are laid on the roadbed, and a cement-bitumen mixture is injected into the joints or through holes previously made in the blocks.Furthermore, the cement-bitumen mixture is filled in the upper part of the roadbed, and the blocks are filled with cement-bitumen mixture. It is also possible to obtain a pavement with an integrated surface layer. These pavement bodies are pavements with good flexibility. By accumulating such research, we were able to achieve the present invention.

An object of the present invention is to provide a cement-bituminous paving product that can be applied at room temperature, has good workability, and can be paved on a par with hot asphalt mixture paving.

The present invention is characterized in that long fibers are incorporated into a mixture of cement, bitumen emulsion, aggregate, and admixtures as necessary, and the mixture is molded and hardened into a plate shape, block shape, etc. This article focuses on cement bituminous molded products for pavement use.

The cement used in the present invention is Portland cement,
These include fly ash cement, blast furnace cement, silica cement, blast furnace colloidal cement, colloidal cement, jet cement, alumina cement, and sulfate-resistant cement.

In addition to these cements, admixtures such as cement shrinkage compensators, hardening accelerators, hardening retarders, AE agents,
Dispersants, thickeners, water reducers, foaming agents, antifoaming agents, etc. can be used in combination.

Bitumen emulsion is bitumen made by mixing one or more of petroleum asphalts, natural asphalts, tars, pitches, etc., such as straight asphalt, prone asphalt, semi-prone asphalt, and flopane de-bituminous asphalt. or modified bituminous materials by adding and mixing rubber, synthetic polymers, etc. These bituminous emulsions are emulsified with rubber latex, bentonite, etc. as the main emulsifying material, and further emulsified in water using appropriate emulsifiers, dispersants, stabilizers, protective colloids, etc. as necessary. It is a mixture of synthetic polymer emulsion, synthetic resin emulsion, water-soluble polymer, water-soluble synthetic resin, etc. Further, a mixture of a reactive water-soluble or emulsified epoxy resin and a reactive resin such as a curing agent thereof may also be used.

Furthermore, bituminous emulsions are broadly classified into anionic emulsions, cationic emulsions, nonionic emulsions, and clay-type emulsions based on the type of surfactant used as the main emulsifying material.

Any type of bituminous emulsion for cement mixing can be used.

Bituminous emulsions with evaporation residue concentrations of 55 to 70% by weight are usually used. Among bituminous emulsions, those containing nidistomers, reactive resins, or both are superior in terms of adhesion, bonding properties, durability, etc. In addition, bituminous materials that are tar-based have better oil and water resistance than asphalt-based materials.

Although coarse aggregate such as gravel or crushed stone may be used in special cases, fine aggregate is usually used.

The fine aggregate has a grain size of 25 m or less and a coarse grain ratio of 1 to 25, preferably 12 to 2. Examples include river sand, sea sand, mountain sand, silica sand, sand made by sintering ash, iron sand, and foundry sand. In addition, fillers such as glass powder, silica sand powder, diatomaceous earth, mica powder, mica chips, bentonite, clay, stone powder, fly ash, anhydrous silica powder, pigments, carbon black, and graphite can be used together with aggregate. can. These can also be used after being dispersed in water. Additionally, colloidal silica can also be used.

Further, short fibers such as inorganic fibers, natural organic fibers, synthetic organic fibers, carbon fibers, etc. can be mixed within a range that does not impair the fluorescent properties of the CA mortar.

The mixture (hereinafter simply referred to as CA mortar) made by mixing cement, bituminous emulsion, and aggregate with admixtures as necessary is made of the above-mentioned materials. Water is used for conditioning.

The blending ratio of CA mortar is, for example, as follows.

The ratio is 0.1 to 5 parts of bituminous emulsion (converted to 60% by weight of evaporation residue) and 0 to 6 parts of aggregate (as sand), usually O to 2 parts, per 1 part by weight of cement (hereinafter simply referred to as parts). used. When using cement shrinkage compensators, hardening accelerators, etc., include them in the amount of cement in the above mixing ratio. Water is used as necessary in consideration of the workability of CA mortar. If the amount of bitumen emulsion is less than that of the former capital with respect to 1 part of cement at the above mixing ratio, the stiffness of the cured product will be strong, the elastic modulus, flexibility, etc. will be insufficient, and the waterproofness will also decrease. When the bituminous emulsion exceeds 5 parts, the strength decrease by 1 is large. Also, the amount of aggregate is 6 parts per part of cement.
When the temperature exceeds 50%, the workability such as the luminosity of the CA mortar decreases. Products that do not use aggregate have good luminescence, as well as excellent freezing and melting resistance.

CA mortar is made by mixing each material at the above-mentioned mixing ratio using an appropriate mixer, such as a concrete mixer, cement mortar mixer, grout mixer, soil mixer, pug mill mixer, mixer for CA mortar, or any other suitable mixer. You can get it.

Long fibers (hereinafter simply referred to as fibers) are fibers such as glass fibers, rayon, polyester, polyamide, polypropylene, vinylon, acrylic, polyvinylidene chloride, polyvinyl chloride, etc., carbon fibers, metal fibers, etc. A strand, thread, etc. made of a large number of fibers bound together with a binding agent, and preferably has a length of 12 min or more. These are, for example, fibers cut into lengths of about 12 to 5 (1 part), or rovings that are a bundle of many continuous strands assembled in an untwisted state. Fibers that are cut into lengths of 12 m or more for use, or continuous fibers or fibers cut to lengths of 12 m or more and piled up bulky to form a mat of an appropriate thickness (
For example, a continuous strand mat) is used.

The amount of fiber incorporated into the CA mortar ranges from 0.5 to 10 volumes of CA mortar. The reinforcing effect of the fibers tends to increase as the amount of fibers increases; however, when the volume exceeds 10 cm, uniform dispersion becomes difficult due to entanglement of the fibers. On the other hand, when the volume is less than 0.5, the fiber reinforcing effect is not sufficient.

The cement bitumen molded product for pavement use of the present invention can be produced by various methods, but the main methods are as follows.

(Fibers (12 to 50 m in length) are mixed with IICA mortar, filled into a mold, and hardened.

(2) Spread a fiber mat on the formwork and apply CA to it.
Fill with mortar and let it harden.

(3) Spread CA mortar and fibers simultaneously or in a mixed manner into the formwork, fill and harden.

(4) After filling the formwork with CA mortar and fiber,
Demold and harden. +11% (21, (Remove the formwork using a method such as at) and then harden.

When filling the formwork with CA mortar or CA mortar mixed with fibers, vibration can be applied to improve the filling. It is also possible to perform pressurized filling. It is also possible to pressurize the diameter of the flash. It is also possible to apply vacuum dehydration to the flash diameter to remove excess water. By employing vibration or pressure methods, CA mortar or fiber-mixed CA mortar with a reduced moisture content can be used, and the density, strength, etc. of the molded product can be improved.

The hardening of CA mortar is mainly due to the water use reaction of cement. In order to accelerate hardening, a hardening accelerator or the like that accelerates hardening of cement can also be used in combination. Alternatively, a method can be used in which a high temperature (for example, around 60° C.) and high humidity atmosphere is created using water vapor, and the material is cured in that atmosphere to promote strength development. Furthermore, a method of curing the cured product using pressurized steam can also be used.

The cement-bituminous molded product for pavement of the present invention contains a large amount of long fibers, which are intersected and dispersed in the cement-bitumen mixture that is the matrix, and are combined with the matrix to form a composite and strengthen the matrix. It has a structure.

Since it is a molded product, it can fully demonstrate its strength through the water use reaction of cement under thorough quality control. In addition, by curing at high temperatures, bituminous substances spread into the siamatrix structure, firmly bonding and strengthening it.

The molded product has excellent pressure resistance, bending strength, flexibility, shear resistance, and impact resistance. It is also highly waterproof and resistant to freezing and thawing.

This paving cement) [The pre-formed product is formed into a plate shape, a block shape, etc., but it is important to choose a formwork that has unevenness and a shape that makes it easy to lay boards or blocks on the side. It can be provided with grooves that can be engaged with each other, or it can be made with holes. The surface of this paving cement bituminous molded product may be colored or anti-slip treated using synthetic resin, colored pigments, aggregates, etc.

Regarding the size, various thicknesses are possible, from about 6 mm to about 100 mm. You can also make thicker ones. Various sizes can be manufactured to suit the pavement and pavement.

Next, the characteristics and effects of the cement-bituminous molded product for pavement according to the present invention will be explained.

(1) Molded products can be made using a process with good quality control that is different from on-site construction, and the structure is formed by incorporating long fibers into a cement-bitumen mixture, which is then molded and hardened to develop sufficient strength. It is composed of fiber-reinforced cement bituminous material.

Since the long fibers are intertwined and dispersed in the cement bituminous hardened body (matrix) and bonded to the matrix, it has excellent performance as described in the following sections. In addition, the matrix exhibits sufficient strength due to the hydration reaction of cement, as well as the binding properties and waterproof properties of the bituminous material.

(2) The molded product has flexibility and high stability like a heated asphalt mixture, and also has poor dimensional stability. No flashing occurs at all.

(3) The molded product has high bending strength and is flexible even when bent, but is less likely to crack or break.

(4) The molded product is strong against impact and does not crack.

(5) The molded product has excellent waterproof properties.

(6) Molded products include bituminous materials such as bituminous emulsion, cutback asphalt, asphalt, and tar, CA mortar,
It has excellent workability as it has good bonding properties with cement mortar and can also be fastened with nails.

As a result, the molded material can be laid on the base to be constructed, creating a hump that can be easily paved or paved.

For example, in the case of a roadbed made of crushed stone, CA mortar can be laid down and a molded product can be laid down on top of this to create an integrated cement-bituminous pavement. Alternatively, a molded product is laid on the roadbed, and CA mortar is injected through the joints or holes previously provided in the molded product, and the gap at the top of the roadbed is also filled to form an integrated cement and blue pavement. You can also build. A similar method can be used when constructing on existing pavement (concrete IJ-to, i-Aozuremo). Furthermore, instead of CA mortar, a slurry in which fine aggregate, filler, etc. are mixed into bituminous emulsion can also be used. Moreover, cement mortar can also be used.

Also, like asphalt polymer latex emulsion,
Asphalt emulsion containing a large amount of rubber latex or synthetic polymer latex (also called emulsion) (for example, an emulsion made by dispersing asphalt into fine particles in the aqueous phase of latex, often with high concentration), or cement The molded product may be stretched using a material mixed with a small amount of sand, filler, etc. For pedestrian bridges (for example, steel deck slabs), this type of construction can also provide good paving.

(7) Durable pavement can be obtained.

Since the molded product of the present invention has the above-mentioned characteristics and effects, it can be used for pavements and pavements of roads, sidewalks, bicycle paths, plazas, factory premises, railway platforms, parking lots, building rooftops, etc. suitable. 'Hereinafter, according to the embodiment of 2.3,
Further, the present invention will be explained in detail.

Example 1 Formwork (inner thickness 30 cm x 50 cm x 5 c
m) Inside, glass fiber long fiber mat, contine, 7
Tostrand mat C8M (manufactured by Asahi Glass, product name)
600t/lr? A piece of wood (approximately 50cm thick) was cut and laid, and cement and blue mortar were filled on top. Cement bituminous mortar is ordinary portland cement 1
parts by weight, 2 parts by weight of sand, and nonionic asphalt emulsion (evaporation residue 60% by weight, penetration of evaporation residue (25°C
) 145) A mixture kneaded at a ratio of 16 parts by weight is densely packed while being vibrated. It is then cured to produce the paving cement bitumen molding (block) of the present invention.

For densely filled products, the mold can be removed before curing. The curing conditions were room temperature curing and curing in air, and curing in a high-temperature, high-humidity chamber of about 60°C with water vapor, which resulted in good molding. I got something. Specimens (4 x 4 x 166
n'), compressive strength and bending tests were performed on the specimen (
5XIOXIOcm) was subjected to a page impact test. The results are as shown in the table.

result Fiber amount (volume%)’] Bending strength (assistance/crnli) 62 Good *1 Bending displacement amount No breakage occurred even at 451 m, and the test was discontinued.

*2 Place the tip of a plunger (the tip has a hemisphere with a diameter of 2 crn and a weight of 1 rim) on the upper center of the impact test specimen, and hold the plunger at a distance of 1 m.
A steel mallet (24 to 9) is dropped from a height of 1, and the number of drops until the specimen cracks is determined.

After 60 drops, no cracks or other abnormalities were observed, and the test was discontinued.

Example 2 1 part by weight of early-strength Portland cement, 2 parts by weight of sand, 14 parts by weight of nonionic asphalt emulsion, and 2 parts by weight of rubber latex (styrene-butadiene-based, nonvolatile content 50% by weight), and a small amount of dispersant. Add and knead to make a mixture, add chopped glass fiber strands (length 20cm) to the mixture, fill the mold with vibration, and then lightly press to remove the excess. The wet water was removed, the mold was removed, and the mixture was cured to obtain a paving cement bitumen molded product of the present invention.

Example 3 In the same manner as in Example 1, a formwork was filled with a mixture of bituminous emulsion, aggregate and cement containing a long fiber mat, and then the surface was lightly stamped with a stamping die with specific grooves (turns). It was pressed to form a pattern on the surface and hardened to obtain a cement bitumen molding for paving.

The blocks made in Examples 1.2 and 3 are both nailable. In addition, it has good adhesion to cement mortar, cement-bituminous mortar (a mixture of cement, bituminous emulsion, and fine aggregate), bituminous emulsion, etc., and is suitable for application to roadways, sidewalks, etc. (for example, on crushed stone roadbeds). In addition, it is suitable for construction on prepared floorboards and concrete floorboards of bridges, etc. Even when it was stretched over the steel deck slab of a pedestrian bridge, it conformed well to the floorboard, was resistant to impact, was resistant to loads from sharp objects such as the heels of high heels, and did well without cracking.

Even in the case of roadways, very good results have been obtained from the partial construction results.

patent applicant

Claims (1)

[Claims] Cement bituminous molding for pavement use, characterized in that long fibers are incorporated into a mixture of cement, bituminous emulsion, aggregate, and admixtures as required, and the mixture is molded and hardened into a plate shape, block shape, etc. thing.