CN104418567B - A kind of preparation method of seabed artificial reef - Google Patents

Abstract

The invention belongs to the technical field of building materials, and specifically relates to a seabed artificial reef, which is composed of cement, sulphoaluminate cement, mortar modifier, anti-dispersion agent, silica fume, fly ash, slag, aggregate and mixing water. prepared in a certain proportion. The invention adopts modified cement-based cementitious material as the basic raw material of the artificial reef, and directly uses seawater as the mixing water to make the artificial reef, which has good fluidity under water, is not easy to disperse, and has a fast setting time. The daily compressive strength is about 5-30MPa, and the 28-day compressive strength is about 10-70MPa. The present invention uses cement, composite aggregate, seawater, etc. to prepare the seabed artificial reef, which is especially suitable for the construction and emergency repair of island reefs that lack building sand and fresh water, and have a long transportation distance and are far away from the coastline of the mainland. The preparation method of the invention is simple and convenient, and has wide application.

Description

A kind of preparation method of seabed artificial reef

technical field

The invention belongs to the technical field of building materials, and in particular relates to a seabed artificial reef.

Background technique:

The 18th National Congress of the Communist Party of China clearly pointed out that building a maritime power is a major national strategy, and the development of the marine economy cannot be separated from the construction of marine engineering, especially the construction of marine engineering on islands and reefs far away from the coastline of the mainland. Due to the ebb and flow of sea water, the irregular distribution of reefs and hidden reefs around the island has brought a lot of inconvenience to the navigation of ships and the life and work of residents on the island. Therefore, rapid construction and repair of basic projects on islands and reefs , For example, the rapid construction of submerged reefs into clear reefs and the implementation of infrastructure projects have very important practical significance for accelerating the development and utilization of deep ocean islands and reefs. However, for the traditional building materials currently on the market, such as cement, river sand, gravel and fresh water, for islands far away from the coastline of the mainland, the transportation, loading and unloading, storage and construction of these raw materials will become very difficult. Not only is the transportation cost too high, but at the same time, in the marine environment far from the coastline of the mainland, especially the loading, unloading and storage of raw materials is almost difficult to put into practice, and the traditional underwater construction technology is also difficult to adapt to the environmental conditions of islands and reefs. Therefore, it is of great strategic significance to develop a kind of engineering material suitable for fast construction of submarine artificial reefs on remote islands or coastlines and a simple construction process for engineering construction on islands and sea reefs far away from the mainland coastline.

Invention content:

The object of the present invention is to propose a kind of high-performance underwater artificial reef-building mortar suitable for rapidly constructing artificial reefs on the seabed. This underwater artificial reef-building mortar not only has good underwater anti-dispersion ability, but also has a fast setting time and The compressive strength can reach 5-30MPa in 24 hours underwater. In addition, the strength of this mortar develops rapidly in the later stage, and can reach 10-70MPa in 28 days. Due to the excellent fluidity and permeability of the mortar, the seabed formed after hardening The artificial reef has good meshing and bonding ability with the existing reef, and finally can be poured from the seabed to the sea level at one time to construct a new type of artificial reef.

The underwater artificial reef mortar proposed by the present invention is composed of cement, sulphoaluminate cement, mortar modifier, anti-dispersion agent, silica fume, fly ash, slag, aggregate and mixing water. The weight percentage is:

The total amount thereof satisfies 100%.

In the present invention, the cement is Portland cement, ordinary Portland cement, slag cement, fly ash cement or pozzolanic cement or one or more composites.

In the present invention, the sulphoaluminate cement is one or more composites of early-strength sulphoaluminate cement or high-strength sulphoaluminate cement.

In the present invention, the mortar modifier is composed of one or more of acrylic acid, ethylene and polyvinyl chloride copolymer, naphthalene sulfonate, polycarboxylate, and melamine polymer.

In the present invention, the anti-dispersion agent is polyacrylamide.

In the present invention, the silica fume is ultrafine _SiO2 powder formed when smelting ferrosilicon ore.

In the present invention, the fly ash is industrial waste slag discharged from coal-fired power plants, one of Class I ash or Class II ash.

In the present invention, the slag is ground blast furnace slag.

In the present invention, the aggregate is one or more composites of sea sand, river sand, stones, dead coral reefs and high molecular polymer resins formed by swelling after absorbing water.

In the present invention, the mixing water is one of fresh water or natural sea water.

Preparation method of the present invention can be divided into following 2 kinds:

①Temporary preparation method: Accurately weigh the raw materials according to the proportion. First, weigh cement, sulphoaluminate cement, mortar modifier, silica fume, fly ash, slag and aggregate and add them to the mixer, then weigh seawater and stir while mixing. Add seawater, stir for 5-10 minutes, stop for 1-3 minutes, and continue stirring for 1-2 minutes to obtain the desired product.

②Dry-mixed mortar method: Accurately weigh cement, sulphoaluminate cement, mortar modifier, anti-dispersion agent, silica fume, fly ash, slag and aggregate in proportion, add to dry-mixed mortar mixer, and stir for 5 -10 minutes, the dry mix is prepared, and then quantitatively packaged according to certain specifications. The packaging should have moisture-proof and anti-seepage effects. At the site of use, dry-mixed mortar and seawater are added to the mixer in proportion, and after mixing for 5-10 minutes, stop the machine for 1-3 minutes. If the formula requires, then accurately weigh the dead coral reef and the polymer resin after water absorption on site. Add it into the blender and continue stirring for 3-5 minutes to get the desired product.

The manufacturing process and construction process of the present invention are simple and convenient, and are suitable for mass production, transportation and storage.

The underwater artificial reef-building mortar of the present invention has a compressive strength of 5-30MPa in 1 day and a compressive strength of 10-70MPa in 28 days after being tested by relevant departments.

The present invention has following advantage:

1. Since the underwater artificial reef-building mortar of the present invention has good underwater anti-dispersion ability and good underwater fluidity, it can be directly poured underwater, and the artificial reef formed after hardening It has good meshing and bonding ability with existing reef.

2. Because the seabed artificial reef of the present invention not only has a higher early strength (up to 5-30MPa in 24 hours), but also develops rapidly in later stage strength (up to 10-70MPa in 28 days), it can be used to quickly pour the seabed on the seabed artificial reef.

3. Since the underwater artificial reef-building mortar of the present invention uses the high molecular polymer resin after water absorption as the artificial aggregate, it changes the concrete process that uses sand and gravel as the aggregate in traditional concrete materials, such as in places far away from the mainland The use of this underwater artificial reef-building mortar in the construction of island and reef projects on the coastline can not only save a lot of sand and gravel transportation, loading and unloading and storage costs, thereby reducing the construction cost of the project, but also can be used for the construction of island and reef projects that lack sand and gravel. The invention provides a new type of underwater rapid construction technology.

4. Because the present invention uses a large amount of fly ash and slag, it can significantly reduce the manufacturing cost of the project.

5. Since the raw materials of the present invention all adopt mass-produced market finished products, the raw materials are easy to get and are suitable for wide application.

Detailed ways

The technical solutions of the present invention will be further described below in conjunction with the examples.

Example 1

Submarine artificial reef made of ordinary Portland cement.

Table 1: Raw materials used

Submarine artificial reefs prepared with Portland cement:

42.5 ordinary Portland cement 32.40%, 42.5 early strength sulfoaluminate cement 1.60%, mortar modifier 2.94%, anti-dispersion agent 0.02%, silica fume 1.87%, fly ash 5.10%, slag 2.37%, bone Material 38.30%, seawater 15.40%,. After accurately weighing the raw materials according to the proportion, stir with a mortar mixer, add sea water while stirring, after stirring for 5-10 minutes, stop the machine for 1-3 minutes, continue stirring for 1-2 minutes, pour the stirred mortar into the In a 4cmx4cmx16cm mold with a depth of 20cm in water, take out the test mold from the water after 6 hours, scrape the surface of the mold with a scraper, put it in water again for 24 hours, and measure the compressive strength of the mortar for 1 day after removing the mold, and other test pieces Put it in seawater at room temperature and maintain it until the test age.

After testing, the 1-day compressive strength of the mortar was 28.1MPa, and the 28-day compressive strength was 62.7MPa.

Example 2

Seabed artificial reefs prepared with slag cement.

Table 2: Raw materials used

Seabed artificial reefs prepared with slag cement:

42.5 slag cement 35.20%, 42.5 early strength sulfoaluminate cement 2.10%, mortar modifier 2.72%, anti-dispersion agent 0.03%, silica fume 2.36%, fly ash 6.89%, aggregate 37.10%, seawater 13.60% . After accurately weighing the raw materials according to the proportion, stir with a mortar mixer, add sea water while stirring, after stirring for 5-10 minutes, stop the machine for 1-3 minutes, continue stirring for 1-2 minutes, pour the stirred mortar into the In a 4cm x 4cm x 16cm mold with a depth of 20cm in water, take out the test mold from the water after 6 hours, scrape the surface of the mold with a scraper, put it back into the water and maintain it for 24 hours, and measure the compressive strength of the mortar for 1 day after the mold is removed. The blocks were maintained in seawater at room temperature until the test age.

After testing, the 1-day compressive strength of the mortar was 10.0MPa, and the 28-day compressive strength was 32.2MPa.

Claims (6)

1. A seabed artificial reef is characterized in that it is made of cement, sulphoaluminate cement, mortar modifier, anti-dispersion agent, silica fume, fly ash, slag, aggregate and mixing water, each component The weight percentage is: Cement 15.00%--45.00% Sulphoaluminate cement 1.60%--8.00% Mortar modifier 0.50%--5.00% Anti-dispersant 0.02%--4.00% Silica fume 0.10%--20.00% Fly ash 1.00%--25.00% Slag 0.00%--15.00% Aggregate 10.00%--55.00% Mixing water 6.50%--25.00% Its total amount satisfies 100%; The cement is one or more composites of Portland cement, ordinary Portland cement, slag cement, fly ash cement or pozzolanic cement; the sulphoaluminate cement is early-strength sulphoaluminate cement Or one or more composites of high-strength sulphoaluminate cement; the mortar modifier is one or more composites of acrylic acid, ethylene and polyvinyl chloride copolymer, polycarboxylate, melamine polymer ; The aggregate is one or more composites of sea sand, river sand, stones, dead coral reefs and high molecular polymer resins formed by swelling after absorbing water. 2. The submarine artificial reef according to claim 1, characterized in that the anti-dispersion agent is polyacrylamide. 3. The seabed artificial reef according to claim 1, characterized in that the silica fume is ultrafine _SiO2 powder formed when smelting ferrosilicon ore. 4. The submarine artificial reef according to claim 1, characterized in that the fly ash is industrial waste discharged from coal-fired power plants, Class I ash or Class II ash. 5. The seabed artificial reef according to claim 1, wherein the slag is ground blast furnace slag. 6. The submarine artificial reef according to claim 1, wherein the mixing water is one of fresh water or natural sea water.