JPS6183701A - Road foundation material and its production - 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] [Technical Field of the Invention] The present invention relates to an invention for effectively recycling the remainder of ready-mixed concrete, which is industrial waste generated from a ready-mixed concrete factory, so-called returned ready-mixed concrete, as a road base material. .

[Prior art and problems]

Traditionally, large amounts of leftover ready-mixed concrete generated during civil engineering and construction work are now illegally dumped in landfills or vacant lots as industrial waste, which has become a major social problem due to destruction of the natural and living environment, etc. .

Therefore, for example, from returned ready-mixed concrete to large blocks (weight 5
00kg) and then processing the returned ready-mixed concrete.
That too had its limits.

In other words, even if large quantities of large blocks are produced, there are limited yards (the places where they can be used are limited, and they cannot be sold as secondary products. Also, the ready-mixed concrete is mixed with oats, so its strength is low, making it difficult for public construction professionals to use it). The reality is that it is not recognized even by Tsuku Laminator, and it is very difficult to dispose of it.

Unhardened concrete would solidify if left as it was, making it difficult to dispose of it.

Some methods have been used to separate and recover crushed stone, sand, and cement, but not only does this increase the cost of recovery and is not economical, but even if crushed stone and sand can be separated and recovered (: The remaining nine items were difficult to recover, and their disposal was extremely difficult.

Furthermore, even if we tried to use recycled ready-mixed concrete as a road base material, unhardened concrete was in a fluid state and could not be compacted, making it impossible to use it.

Therefore, conventional recycled concrete has brought about problems such as illegal dumping of industrial waste and destruction of the natural and living environment.

[Purpose of the invention]

In view of the above-mentioned conventional drawbacks, the present invention aims to provide a composition that allows the remainder of ready-mixed concrete to be effectively used as a roadbed material.

[Key points of the invention]

In order to achieve the above-mentioned object, the present invention is characterized in that coral is blended into the residue left after washing fresh concrete consisting of cement, crushed stone, and sand.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to nine drawings.

The cement is washed from the rest of the concrete, which is a mixture of crushed stone, sand, and cement in a ratio of 4:2:1, i.e., returned ready-mixed concrete or returned concrete, and crushed Ryukyu limestone (uplifted coral reef limestone) powder (commonly known as stone powder or washed coral) is washed. (hereinafter referred to as coral). In the first embodiment,
The ratio of returned concrete to coral is 3 nia.

When using the road base material constructed as described above to asphalt the road as shown in Figure 1, the soil 4 is cut or embanked by rolling it with large rollers, compacting it, and then forming it to a predetermined design thickness. The roadbed material of the present invention is leveled with a grader (consolidation work is carried out by roller compaction, the lower coursebed is finished, and on top of that, thalassocharan (crushed stone to the required particle size) of a predetermined design thickness is applied. The asphalt 1 is laid on top of the upper roadbed 2, which is then finished by rolling.

Here, coral refers to coral reef flock (cora
reefrocks), which refers to limestone on the ocean floor. It is commonly called ``Ishikuu'' and is composed of fine particles (calcareous powder) to large-diameter lumps. It is called coral because it means a rock made of coral reefs.

Next, the typical chemical composition of coral is shown, although it varies slightly depending on the area where it is collected.

In another embodiment of the present invention, the ratio of coral to reconcrete may be 5:5.

Furthermore, as a third embodiment, the proportion of coral and returned concrete may be 7:3.

Figure 2 shows the process of washing the concrete from returned ready-mixed concrete and adding coral.

Ready-mixed concrete shipped from a ready-mixed concrete factory is transported to a construction site and poured. The rest of the poured concrete is used as return concrete and is washed at the return ready-mixed concrete cleaning plant ■, where the concrete content is washed away.

Ready-mixed concrete, from which the concrete content has been washed away, is transported in trunks and unloaded during the process.

On the other hand, coral (stone powder) is mined at the coral mine and transported by truck to the unloading area for the returned ready-mixed concrete.
carried to. Coral and ready-mixed concrete transported to the unloading area are transported to each material measuring device (2) on a belt conveyor, and mixed in a mixer at a predetermined ratio in step (3). The roadbed material (2), which is a mixture of washed ready-mixed concrete and coral, is laid on a road with a cross-section shown in Figure 1.

〔Effect of the invention〕

According to the roadbed material of the present invention configured as described above, it is possible to effectively utilize returned concrete that has conventionally become industrial waste, and the abrasion resistance and strength are significantly improved compared to conventional concrete.

[Brief explanation of drawings]

Figure 1 is a general cross-sectional view of a road when used as a roadbed material.
FIG. 2 is a manufacturing process diagram. 1-- Asphalt (surface roadbed) 2---1--Crusher run (upper road M) 3--
Crushed stone of a required particle size (lower roadbed) 4 - Patent of the 11th Patent Applicant: Yoshiyuki Ohsuga, Patent Attorney, Ohno Sangyo, LLC Figure 2 Procedure Neif ↑ Correct: March 70, 1985 1. Indication of the case 1980 Patent side No. 080138 2. Name of the invention Roadbed material 3. Person making the amendment Relationship to the case Patent applicant address 345 Shinyo, Haebaru-cho, Okinawa Name Limited partnership Ohno Sangyo Representative: Yuki Mori 4, Agent: ◎102 Akane (03) 238-0031 Address: 6-18-6 Kojimachi, Chiyoda-ku, Tokyo? iti
Positive subject Application form, specification. 7. Contents of the amendment (1) In the title of the invention on the second line of page 1 of the specification attached to the application, the phrase "roadbed material and method for manufacturing the same" is amended to read "roadbed material." (2. The scope of the claims is amended as follows. 2. The scope of the claims (1) The invention is characterized in that coral is mixed into the remaining material after washing fresh concrete consisting of cement, crushed stone, and sand. (2) The method is characterized by comprising a step of washing the remaining fresh concrete consisting of cement, crushed stone and sand, and a step of pressurizing the washed remaining material mixed with coral. The roadbed material according to claim 1.

Claims (2)

[Claims] (1) A roadbed material characterized by mixing coral with the remaining material after washing fresh concrete consisting of cement, crushed stone, and sand. (2) A method for manufacturing a roadbed material, which comprises the steps of: washing the remaining fresh concrete made of cement, crushed stone, and sand; and pressurizing the washed remaining material mixed with coral.