CN1183055C - A super fast hard road repair material - Google Patents

Abstract

The invention is an ultra-fast hard road repair material, which is prepared from magnesium oxide, fly ash, ammonium dihydrogen phosphate, borax and other materials according to a certain weight ratio. The repair material has the characteristics of fast setting and hardening, high bonding strength, good volume stability, good matching with material properties, etc., and is very convenient to prepare and use, and can be widely used in roads, airport runways, bridges, ports and docks, etc. Concrete quick repair.

Description

A super fast hard road repair material

technical field

The invention belongs to the technical field of building materials, and in particular relates to an ultra-fast and hard road repair material, which can be widely used in rapid repair of concrete in projects such as roads, highways, airport runways, bridges, ports and docks.

technical background

Since the 1980s, with the rapid development of my country's economy, the scale of infrastructure construction, especially the infrastructure construction with reinforced concrete as the main material, has been increasing day by day. In recent years, it has been found that concrete damage in civil engineering such as roads, bridge decks, ports, docks, airports, and buildings has been increasing, resulting in huge direct and indirect economic losses. In addition to the harsher environmental conditions and the poor durability of concrete during design, the reasons are also related to factors such as insufficient construction management, blind pursuit of progress, and lax quality control. In order to restore the function of these concrete structures and ensure the safety of use, they must be repaired in time.

There are three main types of traditional cement concrete repair materials: the first type is ordinary cement-based materials, but the strength is higher; the second type is polymer materials, such as epoxy resin, polyurethane, acrylic acid and various latex preparations. Polymer mortar or polymer cement mortar; the third category is special cement, mainly super early strength rapid hardening cement based on sulphoaluminate, high alumina cement and a small amount of other chemical cement. At present, each of these three types of materials has advantages and disadvantages. Although the first type of material is cheap and matches the material properties of old concrete such as thermal expansion coefficient and elastic modulus, it has the disadvantages of low bond strength and slow setting and hardening; the second type of material is just the opposite, although setting and hardening is fast, The bonding strength is high, but the price is high, and it does not match the material properties of the old concrete, such as thermal expansion coefficient and elastic modulus, and is easy to age; the third type of materials, such as sulfoaluminate cement and high alumina cement, although the setting and hardening time, price and The performance is between the first two types, but the bond strength is still not high, and the volume stability is not very good.

Contents of the invention

The object of the present invention is to provide an ultra-fast hard road patching material with fast setting and hardening, good volume stability, high bonding strength with cement concrete, and matching material properties.

The ultra-fast hard road patching material proposed by the present invention is formulated from fly ash, magnesium oxide, ammonium dihydrogen phosphate, borax and sodium metapolyphosphate, and is in the form of solid powder. The proportioning ratio of each component by weight percentage is as follows :

Magnesium Oxide 20～80%

Fly ash 0～50%

Ammonium dihydrogen phosphate 5～25%

Borax 0～20%

Sodium metapolyphosphate 0～15%

The total amount satisfies 100%.

Its better ratio is as follows:

Magnesium Oxide 40～70%

Fly ash 10～30%

Ammonium dihydrogen phosphate 10～25%

Borax 3～15%

Sodium metapolyphosphate 1～5%

The total amount satisfies 100%.

Among the above components,

(1) Magnesium oxide, which requires a calcination temperature of 1200-2000°C, a specific gravity of 3.3-3.5, a MgO content greater than 80%, and a specific surface area of 150-400m ² /kg;

(2) Low-calcium fly ash can be used for fly ash, which can meet the quality requirements of secondary ash;

(3) Ammonium dihydrogen phosphate can be an industrially pure powder product, with a content greater than 90%;

(4) Borax can be an industrially pure powder product with a content greater than 90%;

(5) Sodium metapolyphosphate can be an industrially pure powder product with a content greater than 90%.

The preparation method of the repairing material proposed by the present invention is as follows: Weigh the raw materials of each component according to the weight ratio, and mix them uniformly in a ball mill for 10-40 minutes to obtain the product of the present invention in the form of solid powder. Product storage requirements airtight, moisture-proof.

The repair material of the present invention has the following advantages and effects:

① High strength and rapid development, for example, the flexural and compressive strengths of 4×4×16cm mortar are greater than 6MPa and 50MPa in 1 hour, and greater than 8MPa and 65MPa in 7 days;

② High bonding strength, the bonding strength of 3 hours and 3 days is greater than 4MPa and 7.5MPa respectively;

③ The clotting time can be adjusted in a large range, and it is easy to adjust within 2 to 90 minutes according to needs;

④ Match with cement concrete material properties such as thermal expansion coefficient, elastic modulus, etc.;

⑤ The use of the rapid recovery structure can restore the operation of roads, airport runways, etc. within 1 hour;

⑥ Good volume stability and small drying shrinkage;

⑦It has very excellent anti-freeze and anti-salt frost erosion performance, and also has good anti-wear and anti-corrosion performance of steel bars;

⑧It can be repaired normally at low temperature;

⑨It can still maintain high strength and stable performance at high temperature (such as 600°C);

⑩The color of the repair material can be adjusted according to requirements.

The using method of repairing material of the present invention:

① Like ordinary Portland cement, it can be used after adding water in a certain proportion and stirring;

②Before construction, just remove and clean the damaged concrete layer to apply the repair material, without spraying water on the surface;

③ When smearing, it should be operated quickly, and the mixing tool should be cleaned in time;

④After construction, the material of the present invention does not need special maintenance such as watering and heating, etc. According to engineering requirements, the use function of the structure can be restored within 1 to 5 hours.

Detailed ways

The present invention is further described below by way of examples.

Example 1:

The mixing ratio of the repairing material is (percentage by weight):

Magnesium oxide (specific surface area is 200m ² /kg) 70.25%

Ammonium dihydrogen phosphate 22.75%

Borax 5%

Fly Ash 0%

Sodium metapolyphosphate 2%

When the repair material: water: sand = 1:0.17:1, the flexural and compressive strengths were 7.8MPa and 58.7MPa in 1 hour, 10.8MPa and 77.6MPa in 7 days, and the setting time was about 20 minutes.

Example 2:

The mixing ratio of the repairing material is (percentage by weight):

Magnesium oxide (specific surface area is 200m ² /kg) 57%

Ammonium dihydrogen phosphate 19%

Borax 4%

Fly ash 20%

Sodium metapolyphosphate 0%

When the repair material: water: sand = 1:0.13:1, the flexural and compressive strengths were 7.7MPa and 60.5MPa in 1 hour, 10.2MPa and 78.4MPa in 7 days, and the setting time was about 24 minutes.

Example 3:

The mixing ratio of the repairing material is (percentage by weight):

Magnesium oxide (specific surface area is 200m ² /kg) 49.1%

Ammonium dihydrogen phosphate 16.4%

Borax 3.5%

Fly ash 30%

Sodium metapolyphosphate 1%

When the repair material: water: sand = 1:0.12:1, the flexural and compressive strengths were 6.6MPa and 52.3MPa in 1 hour, 10.2MPa and 74.6MPa in 7 days, and the setting time was about 22 minutes.

Example 4:

The mixing ratio of the repairing material is (percentage by weight):

Magnesium oxide (specific surface area is 200m ² /kg) 50%

Ammonium dihydrogen phosphate 25%

Borax 2%

Fly Ash 18%

Sodium metapolyphosphate 5%

When the repair material: water: sand = 1:0.17:1, the flexural and compressive strengths were 7.2MPa and 56.2MPa in 1 hour, 9.9MPa and 71.4MPa in 7 days, and the setting time was about 30 minutes.

Claims (4)

1. An ultra-fast hard road repair material, characterized in that it is formulated from fly ash, magnesium oxide, ammonium dihydrogen phosphate, borax and sodium metapolyphosphate, and is in the form of solid powder. For example: Magnesium Oxide 40～70% Fly ash 10～30% Ammonium dihydrogen phosphate 10～25% Borax 3～10% Sodium metapolyphosphate 1～5% The total amount meets 100%. 2. The repair material according to claim 1, characterized in that the calcination temperature of said magnesium oxide is 1200-2000°C, the specific gravity is 3.3-3.5, the MgO content is greater than 80%, and the specific surface area is 150-400m ² /kg . 3. The repairing material according to claim 1, characterized in that said fly ash is low-calcium fly ash, the quality of which is above grade two. 4. A method for preparing the ultra-fast hard road repair material as claimed in claim 1, characterized in that the raw materials of each component are weighed according to the weight ratio, and mixed uniformly in a ball mill for 10-40 minutes.