KR20230020871A - Eco-friendly high-strength asphalt and manufacturing method - Google Patents

Abstract

The purpose of the present invention is to manufacture high-strength asphalt by mixing abalone shells during asphalt production. The present invention provides an asphalt concrete mixture with improved strength, which is made by mixing asphalt and coarse aggregate, fine aggregate, or filler for asphalt paving while including pulverized abalone shell instead of the filler. The crushed abalone shell of the present invention is mixed in an amount of 5 to 20 wt% based on the total weight of the asphalt mixture. The asphalt according to the present invention was found to increase strength by more than 30 times compared to existing asphalt, and thus can be made into high-strength asphalt and used for road paving.

Description

Eco-friendly high-strength asphalt and manufacturing method

The present invention relates to eco-friendly high-strength asphalt and a manufacturing method, and relates to a high-strength asphalt for road paving and a manufacturing method obtained by adding abalone shell powder during asphalt production.

Asphalt is commonly called ascon, and is manufactured through the process of mixing asphalt, aggregate, filling material, etc., by heating and mixing these materials at a high temperature of 160 ~ 180 ° C. After laying and compacting on the road, It goes through the process of being used for a long time for several years in a state of being cooled to room temperature and exposed to various environments such as sunlight and rainwater.

However, when a long period of time elapses, the road is damaged, resulting in potholes, cracks, cracks, etc., and when a driver who has not found a pothole recognizes a pothole and tries to avoid it by turning the steering wheel urgently, it can lead to a major accident. In addition, it is difficult to find potholes at night in rainy weather and vehicles passing through potholes lead to damage (FIG. 1).

On the other hand, abalone is a shellfish belonging to the abalone family of primitive gastropods and inhabits all the coasts of Korea. According to the results of the 2020 Fisheries Production Trend Survey by the National Statistical Office, the production of abalone was 36,684 tons. The produced abalone is distributed and consumed in hotels and restaurants nationwide.

Looking at the outlook for each aquaculture item at the 2021 Maritime and Fisheries Observatory, domestic abalone consumption was predicted to be 21,900 tons. However, abalone shells generated from consumed abalone are classified as substances that should not be put in food waste bins, so it is difficult to treat them as garbage and, if left nearby, civil complaints are occurring due to odor and harm to the landscape.

In addition, abalone is killed during the farming process, and 14.3 million abalone died due to the influx of fresh water due to heavy rains in Jindo-gun recently.

Over 95% of the abalone shell is composed of calcium carbonate (CaCO ₃ ), so it is strong enough not to break even when trucks pass through it. Scientists guessed that the answer to the fact that abalone was made of hard material would lie in the unique structure of the abalone shell, and as a result of observation with an electron microscope, the outer and inner layers of the shell were clearly distinguished. The outer layer was full of pillars aligned vertically with the shell faces, while the inner layer was tightly packed with horizontal thin plates, resembling bricks stacked vertically up and down horizontally on the walls of a red brick house.

Among the components of the abalone shell, the remaining 5% is mainly composed of protein. However, the protein is more distributed as it goes inside. From this, when a strong force is applied from the outside, the protein layer filled between the aragonite plates stretches thickly and sustains the gap between the plates. As a result, cracks in the inner layer do not develop in one direction and take on a zigzag pattern. The range of cracks is only 300 to 500 nanometers in diameter.

The present invention is to provide a method for manufacturing eco-friendly high-strength asphalt by mixing discarded abalone shells with asphalt paved on roads.

Domestic Patent No. 10-1375577 Domestic Patent No. 10-1139059 Domestic Patent No. 10-0487263

An object of the present invention is to prepare high-strength asphalt by mixing abalone shells with a certain amount of asphalt and coarse aggregate, fine aggregate, or asphalt paving filler during asphalt production.

The present invention provides asphalt with improved strength, which is made by mixing asphalt and coarse aggregate, fine aggregate, or asphalt pavement filler as an asphalt concrete mixture, but includes pulverized abalone shells instead of filler. The content of the pulverized abalone shell of the present invention is characterized in that it is mixed with 5 to 20% by weight based on the total weight of the asphalt mixture.

As another embodiment of the present invention, washing the abalone shell; Grinding the washed abalone shells with a grinder; As an asphalt concrete mixture, the prepared abalone shell powder is mixed with a certain amount of asphalt and coarse aggregate, fine aggregate or asphalt paving filler to provide an asphalt manufacturing method with improved strength, characterized in that for producing asphalt.

The abalone shell washing of the present invention includes immersing the abalone shells in a fermentation tank storing fermented water and fermenting them with microorganisms for a certain temperature and time. The fermented water of the present invention may be a culture solution of a microbial strain having the ability to decompose foreign substances attached to abalone shells.

Road pavement using high-strength asphalt containing the abalone component of the present invention has the effect of reducing the government's road paving budget and allowing drivers to drive safely on higher-strength asphalt than before.

1 shows an example of a damaged road.
Figure 2 shows the abalone shells pulverized through the primary treatment of the present invention.
Figure 3 shows the asphalt prepared for each experimental sample.
4 and 5 show the asphalt mixing composition ratio and the prepared asphalt in which the abalone shell was mixed and manufactured.

Asphalt concrete is abbreviated as 'ascon', and is classified into asphalt, asphalt mixture, asphalt concrete, heat mix, heat laying bitumen paving mixture (KS F2349 standard), HMA (hot mix asphalt), etc.

General asphalt concrete mixture is a mixture of asphalt, coarse aggregate (gravel), fine aggregate (sand), or asphalt pavement filler at room temperature and is mainly used for road pavement or parking lot. are separated by

The fill material shall be a powder of limestone, Portland cement, slaked lime or other suitable mineral material. Since the abalone shell powder of the present invention is a lime component, no additional cost is incurred even if the abalone shell powder is added as a filling material.

In order to add abalone shells as a filling material, it is necessary to wash and treat the abalone shells. Barnacles or other adherent organisms live on the shells of farmed abalone and need to be removed. Also, since it contains salt, it is necessary to remove the salt component. In general, a physical removal method using a foreign material removal device is used to remove foreign substances from the abalone shell, but in the present invention, a cleaning method using microorganisms is used. Hereinafter, the abalone shell cleaning composition of the present invention and the abalone shell cleaning method using the same as an active ingredient will be described.

Example 1 Abalone shell treatment

The abalone shell cleaning composition of the present invention and the abalone shell cleaning method using the same as an active ingredient consumes the edible parts and puts the discarded abalone shells into the abalone shell primary treatment device to physically remove foreign substances on the surface of the shells by stirring Abalone First shell processing step (A); A fermented water immersion step (b) in which the abalone shells that have undergone step (a) are immersed in a fermentation tank in which fermented water is stored and fermented at a certain temperature and for a period of time; After the abalone shells that have gone through step (b) are separated from the fermenter, the fermented water on the surface of the abalone shells is washed and dried, and the asphalt manufacturing and supplying step (c) is performed for use as asphalt.

(A) 1st processing step of abalone shell

In the first abalone shell processing step (a) of the present invention, the abalone shell separated from the edible part is put into the abalone shell primary processing device, and the relatively large foreign matter attached to the shell surface by the rotation of the stirrer is separated by a physical method can include

In the primary processing device for abalone shells according to an embodiment of the present invention, abalone shells are transported from an input hopper into which abalone shells stored in a storage yard are put into the device, and a cylinder-structured separation container with a grid of a certain size is formed at the bottom and It is installed vertically and rotates, and a collection unit may be installed at the lower part of the separation cylinder to collect the abalone shell foreign substances separated from the lattice of the separation cylinder by being spaced apart at a predetermined interval.

The lattice formed in the cylinder of the abalone shell primary processing device is formed in a size smaller than the abalone shell and larger than the foreign matter attached to the abalone shell, so that physical foreign matter separation is possible.

(B) fermented water immersion step

The step (b) of immersing in released water of the present invention is a step of immersing the abalone shells passed through step (a) in a fermentation tank in which fermented water is stored and fermenting microorganisms at a certain temperature and time. The fermented water of the present invention may be a culture solution of a microbial strain having the ability to decompose foreign substances attached to abalone shells. The strains of the culture broth were Pseudomonas linyingensis, Pseudomonas humi , Bacillus altitudinis , Curvibacter delicatus , and Acidovorax delafieldii . It may be to include any one or more microorganisms selected from the group consisting of.

Also in the group consisting of Pseudomonas linyingensis, Pseudomonas humi , Bacillus altitudinis , Curvibacter delicatus , and Acidovorax delafieldii It may include any one or more selected microorganisms. The above strains are species that can be distributed in a microbial depository institution.

The fermented water of the present invention is put into a fermentation tank, maintains a temperature of 30 to 35 ° C, and continuously supplies oxygen. In the fermented water immersion step of the present invention, the abalone shells after step (a) are completed are put into a fermentation tank in which the fermented water is stored and immersed for 24 hours at a temperature of 30 to 35 ° C.

In addition, oxygen may be injected into the fermentation tank to maintain an aerobic state in the fermented water. The water temperature of 30 to 35 ° C. can be said to be the most suitable condition for fermentation and washing activities of microorganisms. The strain contained in the fermented water at the water temperature ferments and decomposes foreign substances attached to the abalone shell, enabling perfect washing in a simpler and shorter period of time.

(C) Asphalt manufacturing and supplying stage

In the asphalt production and supply step (c) for use as abalone shells for producing asphalt of the present invention, the abalone shells passed through step (b) are separated from the fermentation tank, the fermented water is washed and dried, and then used for asphalt production Include steps.

2 shows abalone shells and powder that have undergone step (c) of the present invention. The abalone shells that have been washed through steps (a) to (c) of the present invention do not contain conventional salt and harmful bacteria, and can be completely cleaned in a short time compared to the conventional physical method of washing abalone shells. It can be said to be a feasible method and can be used immediately for asphalt production.

The washed abalone shell can be used by processing the shell integrally, or it can be used by dividing it into an outer layer and an inner layer of the shell. The material constituting the outer layer of the abalone shell is calcite having a square column shape, and the plate of the inner layer is hexagonal aragonite. Aragonite is 2 to 3 micrometers in diameter and about 300 nanometers thick.

The outer layer of the abalone shell has a column structure aligned vertically with the shell face, and the inner layer has a structure in which thin plates are tightly packed horizontally and contains nacre. The process including the nacre inside is separated and processed in the horizontal direction using a horizontal grinder. Separately separated inner nacre powder is included in a certain amount during asphalt production, or a certain amount is sprinkled on the road surface after asphalt pavement.

The separately processed nacre has a property of reflecting light, and when it is included as an asphalt material, it receives light irradiation from the road surface at night and scatters a certain amount of light, thereby enabling the direction and location of a distant road to be confirmed.

Example 2 Asphalt preparation and strength test containing abalone shell powder

In order to develop the high-strength asphalt of the present invention, discarded abalone shells were washed and prepared, and then pulverized using a general grinder. The size of the crushed abalone shell was about 1 mm (Fig. 2). Crushed abalone shell powder was used for asphalt production.

A) Manufacture of laboratory asphalt

For the asphalt used in the present invention, commercially available asphalt (trade name Barobaro, normal temperature ascon emergency road repair material) was purchased for urgent repair of potholes and cracks. The purchased asphalt was viscous enough to allow adhesion to each other.

For the high-strength asphalt experiment, six containers of a certain size (8 cm wide, 5 cm long, and 2 cm high) were prepared, and six containers for mixing asphalt and abalone shell powder were separately prepared.

120 g of asphalt was prepared for each experimental sample, and 5%, 10%, 15%, 20%, and 30% of the weight of the abalone shell powder were prepared. Figure 3 shows the asphalt prepared for each experimental sample.

In order to mix the prepared asphalt and abalone shell powder, put them in a container and mix them using VORTEX-GENIE 2 for about 30 seconds, and then, for each sample, 5% (6g, which is 5% of abalone shell 120g of asphalt), 10% (120g of asphalt) 10% of abalone shells by weight, 12 g), 15% (15% of abalone shells by weight of 120 g of asphalt, 18 g), 20% (24 g by weight of abalone shells by 120 g of asphalt), 30% (abalone shells by weight of 120 g of asphalt 30 %, 36 g) was again filled into each container. In the control group, only 120 g of single asphalt was filled.

The experimental asphalt was viscous, but as the abalone shell ratio increased, it was not mixed with the asphalt, so the shell powder remained. It is judged that it was difficult to mix with asphalt because it was purchased and used for emergency repair made of asphalt, and when abalone shells are added at the last stage of the asphalt manufacturing process in an asphalt factory, it is judged that this problem will be solved. 4 and 5 show the asphalt mixing composition ratio and the prepared asphalt in which the abalone shell was mixed and manufactured.

In addition, in the present invention, since it was not possible to compact the roller at the asphalt pavement site, in order to compact the mixed asphalt, close the lid of the mixed asphalt container, put an 80kg object on it, and apply pressure to maintain it for 7 days did

B) Jeong Jae-Ha Experiment

The static load test was conducted using a universal testing machine (UTM) with a capacity of 1,000 KN (100 tonf) at the request of the Department of Civil Engineering, Jeju National University. Displacement control was performed as a control method, and the load speed was implemented at 35 mm/min. The speed used for compressive strength was 280.00 KN/min.

Compressive strength test results for each sample division Dimension (mm) Area Load Comp. Length Thickness (Ave.) Height (mm ² ) (kN) (kPa) contrast 78.03 20.53 19.65 20.09 53.21 1567.62 0.6 382.75 5% 77.83 20.42 19.53 19.975 53.65 1554.65 0.8 514.59 10% 78.17 21.06 20.43 20.745 53.38 1621.64 0.7 431.66 15% 78.11 21.19 21.81 21.5 53.19 1679.37 0.5 297.73 20% 78.05 20.5 21.12 20.81 53.31 1624.22 0.5 307.84

As a result of the experiment, in the experimental group with 5% shell powder added, the road resilience modulus (KN) was 0.8, 33.3% higher than that of the control group 0.6, and the compressive strength was 514.59 kPa, which was 34.4% higher than the control group's 382.75 kPa. Even in the experimental group with 10% shell powder added, the road recovery modulus (KN) was 0.7, 16.6% higher than the control group 0.6, and the compressive strength was 431.66 kPa, 12.7% higher than the control group 382.75 kPa.

From the above results, as a general asphalt concrete mixture, asphalt, coarse aggregate (gravel), fine aggregate (sand), or asphalt pavement filler are mixed with abalone shells to manufacture various types of asphalt with improved strength depending on the purpose, purpose, function, and construction method. can do.

Asphalt according to the present invention is shown to have an effect of increasing strength by 30 times or more than conventional asphalt, so that high-strength asphalt can be manufactured and used for road paving, so there is industrial applicability.

Claims (3)

An asphalt concrete mixture made by mixing asphalt with coarse aggregate, fine aggregate, or asphalt pavement filler, but with improved strength, characterized in that it contains abalone shell pulverized material instead of the filler
The strength-enhanced asphalt according to claim 1, characterized in that the content of the abalone shell pulverized mixture is 5 to 10% by weight based on the total weight of the asphalt mixture
Washing the abalone shells; Grinding the washed abalone shells with a grinder;
Asphalt manufacturing method with improved strength, characterized in that for producing asphalt by mixing a certain amount of the prepared abalone shell powder together with asphalt and coarse aggregate, fine aggregate or asphalt paving filler as an asphalt concrete mixture

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