CN1303034C - Quick repairing polymer cement base material and its preparing method - Google Patents

Abstract

The invention relates to a polymer cement-based rapid repair material for hydraulic engineering and construction engineering. Specifically, it is composed of Portland cement, high alumina cement, redispersed latex powder, high-efficiency water-reducing glue, sodium carbonate and other materials in a certain weight ratio. The repairing material has high bonding strength and wide construction adaptability, and is especially suitable for construction on wet base surfaces.

Description

Polymer cement-based rapid repair material and preparation method thereof

technical field

The invention relates to a polymer cement-based rapid repair material for hydraulic engineering and construction engineering and a preparation method thereof. Specifically, it relates to a powdery high-performance polymer cement-based rapid repair material with the functions of repair, reinforcement and anti-seepage in hydraulic engineering, construction, bridges, tunnels and other projects and its preparation.

Background technique

Due to its high brittleness, concrete structures often crack inevitably in engineering applications. The watertightness of the concrete structure decreases and leaks due to cracking, which affects the service life of the project and even cannot be used normally. This is a common problem in the construction industry. There are two main reasons for cracks in concrete structures. One is caused by deformation, including temperature and humidity changes, shrinkage, expansion, uneven subsidence, etc.; the other is caused by direct stress of external loads (dynamic and static loads). cracks. After the concrete structure is damaged in hydraulic engineering, roads, bridges and other projects, it needs to be quickly repaired. From the analysis of the causes of cracking in concrete structures and environmental conditions, it is of great significance to develop new high-performance repair materials.

Conventional inorganic repair materials such as ordinary Portland cement, etc., have good durability, but they are brittle, unstable in size, easy to crack, and low in bonding strength. It is an indisputable fact that they are not suitable for rapid repair. restricted. The use of organic polymers in inorganic cement has greatly expanded the application range of cement, and polymer modified cement-based repair materials have excellent flexibility, strength and durability. However, the currently widely used polymer emulsion modified cement-based repair materials are two-component construction materials, which are subject to many restrictions in actual storage, transportation, and construction applications. In particular, they cannot be repaired in wet environments or underwater. It is necessary to develop a permanent polymer cement-based rapid repair material with the characteristics of rigidity and softness, high strength, certain elongation, and construction on wet base surfaces, and it should be non-toxic and non-polluting , in line with sustainable development products.

Contents of the invention

The purpose of the present invention is to provide a powdery high-performance polymer cement-based rapid repair material with repairing, reinforcing and anti-seepage functions, high bonding strength and wide construction adaptability.

The polymer cement-based rapid repair material proposed by the present invention is a single-component material composed of inorganic powder and polymer latex powder, specifically composed of Portland cement, high alumina cement, redispersed latex powder, and water reducing agent. , sodium carbonate, bentonite, quartz sand. The weight ratio of each component is as follows:

Portland cement 100

High alumina cement 10-50

Redispersed latex powder 5-25

Water reducing agent 0.5-3

Sodium carbonate 0-10

Bentonite 5-25

1.25mm-2.5mm quartz sand 20-100

Less than 1.25mm quartz sand 30-150.

The optimal proportioning ratio of each component is:

Portland cement 100

High alumina cement 20-30

Redispersed latex powder 10-20

Water reducing agent 0.5-1.5

Sodium carbonate 0-5

Bentonite 10-20

1.25mm-2.5mm quartz sand 30-70

Less than 1.25mm quartz sand 40-90.

In the present invention, the water reducing agent used may be polycarboxylate, sodium methylnaphthalene sulfonate condensate, sulfamic acid and the like.

The invention is a one-component rapid repair material compounded by inorganic powder and polymer latex powder. After the inorganic powder is mixed with water, it hydrates rapidly and coagulates and hardens rapidly. The polymer latex powder dispersed in the slurry is also adsorbed on the surface of cement and its hydration products and other fillers under the heat generated by the rapid hydration of the inorganic powder, and with the consumption and evaporation of water, the polymer The particles slowly move closer to each other and coagulate together, and further solidify to form a continuous network structure, which makes the repair material have good flexibility and mechanical properties. It not only has high bonding strength, but also has wide construction adaptability, especially suitable for construction on wet base surface.

The preparation method of the present invention is as follows: the cement is made of Portland cement with a strength grade of 52.5, and the high-alumina cement is selected with a strength grade of 62.5 or above. The free moisture content of each component is controlled below 0.5%.

Weigh various raw materials according to the proportion of the formula, add quartz sand, Portland cement, high alumina cement, redispersed latex powder, water reducing agent, sodium carbonate, bentonite into the mixer in sequence, and mix well to form a product.

The advantages of the present invention are:

(1) The setting time is fast, and the setting time can be adjusted appropriately according to the needs, which is suitable for rapid repair and reinforcement of various projects;

(2) It has high early strength, toughness, good deformation ability and high durability;

(3) Strong bonding force with various substrates, compared with ordinary cement mortar, the bonding strength is greatly improved;

(4) It has good physical and mechanical properties, its flexural strength, bond strength, ultimate tensile value are greatly improved, low water absorption, high permeability and waterproof performance;

(5) It can be constructed in a humid environment, and the construction operation is simple and flexible;

(6) The product is non-toxic, tasteless, harmless to the human body, does not pollute the environment, and is an environmentally friendly quick repair material.

Detailed ways

The polymer cement-based rapid repair material is composed of Portland cement, high alumina cement, redispersed latex powder, water reducer, sodium carbonate, bentonite, and quartz sand. According to the environmental conditions of the application, the required performance can be obtained by adjusting the invented formula.

Example 1

Portland cement 100

High alumina cement 30

Redispersed latex powder 10

Polycarboxylate 2

Sodium carbonate 1

Bentonite 10

1.25mm-2.5mm quartz sand 20

Less than 1.25mm quartz sand 30.

The above-mentioned components are prepared according to the above-mentioned process to prepare a rapid repair material, which has the characteristics of large fluidity, moderate setting time and high strength. It can be poured into cracks of a certain width, and is suitable for large-area repair and reinforcement projects.

Example 2

Portland cement 100

High alumina cement 20

Redispersed latex powder 15

Sodium methylnaphthalene sulfonate condensate 1.5

Sodium carbonate 0

Bentonite 8

1.25mm-2.5mm quartz sand 80

Less than 1.25mm quartz sand 120.

The rapid repair material prepared from the above components according to the aforementioned process has the characteristics of super high strength, high bonding strength, high fluidity and moderate setting time, and is suitable for various repair and reinforcement projects.

Example 3

Portland cement 100

High alumina cement 40

Redispersed latex powder 12

Sulfamate 1.0

Sodium carbonate 4

Bentonite 10

1.25mm-2.5mm quartz sand 50

Less than 1.25mm quartz sand 80.

The rapid repair material prepared from the above components according to the aforementioned process has the properties of short setting time, high bonding strength and high strength, and is suitable for special emergency repair and reinforcement projects.

Claims (3)

1. A polymer cement-based rapid repair material is characterized in that it is composed of Portland cement, high alumina cement, redispersed latex powder, water reducer, sodium carbonate, bentonite, and quartz sand. The weight ratio of each component is as follows: Down: Portland cement 100 High alumina cement 10-50 Redispersed latex powder 5-25 Water reducing agent 0.5-3 Sodium carbonate 0-10 Bentonite 5-25 1.25mm-2.5mm quartz sand 20-100 Less than 1.25mm quartz sand 30-150. 2. The polymer cement-based quick repair material according to claim 1, characterized in that the weight ratio of each component is as follows: Portland cement 100 High alumina cement 20-30 Redisperse latex powder 10-20 Water reducing agent 0.5-1.5 Sodium carbonate 0-5 Bentonite 10-20 1.25mm-2.5mm quartz sand 30-70 Less than 1.25mm quartz sand 40-90. 3. A method for preparing polymer cement-based rapid repair materials as claimed in claim 1, characterized in that various raw materials are weighed according to the formula ratio, and quartz sand, Portland cement, and high alumina cement are sequentially added to the mixer , Redisperse latex powder, water reducer, sodium carbonate, bentonite, fully stir evenly to form a product.