CN107500651A - A kind of extremely cold type cement glue - Google Patents

Abstract

The invention discloses a kind of extremely cold type cement glue, include the raw material of following parts by weight：2 parts of cement, 0.8~1.1 part of quartz sand, 0.45~0.52 part of water, 0.05~0.07 part of water reducer, 0.25~0.30 part of silicon ash, 0.001~0.002 part of air entraining agent.The extremely cold more universal cement glue Freeze-thawing Tolerance of type cement glue of the present invention can significantly improve, reduce the internal stress effect between steel pin, cement glue, porcelain piece, chapeau de fer as caused by cement low-temperature expansion, so as to reduce the possibility of porcelain piece destruction, probability of malfunction of the porcelain insulator under steep wave impact is fundamentally reduced.

Description

A kind of extremely cold cement adhesive

Technical field:

The invention relates to an extremely cold type cement adhesive, which belongs to a material used for the production of porcelain insulators.

Background technique:

With the development of the power industry, ultra-high voltage, long-span, and long-distance power transmission have been rapidly popularized. In order to meet the development of the power industry, UHV power transmission and transformation technology puts forward higher requirements for insulators, and requires higher reliability for each component.

Cement binder is prepared by mixing cement, aggregate and water in a certain proportion, and the strength of cement binder increases gradually during the process of hydration and hardening. Cement adhesive is an important part of electromagnetic products. It plays the role of integrating porcelain parts and metal accessories. Its quality is directly related to the performance, life and reliability of insulators. At present, cement adhesive is the most important part of electromagnetic products. The weak link obviously cannot meet the production demand, especially when used in the extreme cold environment in the northern region, its freeze-thaw resistance performance is difficult to meet the requirements, the cement adhesive expands at low temperature, steel feet, cement adhesive, porcelain parts and iron caps The internal stress between them is large, and the porcelain insulators are easily damaged and malfunctioned under the impact of steep waves.

Invention content:

In order to solve the above problems, the object of the present invention is to provide a cement adhesive with high freeze-thaw resistance and suitable for use in extremely cold environments.

The object of the present invention is implemented by following technical scheme, a kind of extremely cold type cement adhesive, it comprises the raw material of following weight portion:

2 parts of cement,

0.8-1.1 parts of quartz sand,

0.45 to 0.52 parts of water,

0.05-0.07 parts of water reducing agent,

Silica fume 0.25～0.30 parts,

0.001 to 0.002 parts of air-entraining agent.

Further, it includes the following raw materials in parts by weight:

2 parts of cement,

1 part of quartz sand,

0.49 parts of water,

0.06 parts of water reducing agent,

0.28 parts of silica fume,

Air-entraining agent 0.0014 parts.

Further, the air-entraining agent is one or more of rosin thermal polymer, rosin soap, and sodium alkylbenzene sulfonate.

Air-entraining agents, also known as air-entraining agents, are usually water surfactants. When dissolved in water and stirred, a large number of fine air bubbles are formed in the mortar, with a size of about 50-125 μm. Since the surface active substances can be oriented and adsorbed on the surface of the air bubbles, the air bubbles can not be easily broken. Evenly distributed tiny air bubbles reduce the contact between sand particles, which can improve the fluidity and stability of the mud (anti-bleeding ability). Microscopic air bubbles in the hardened slurry insulate the capillary channel, prevent moisture migration, and increase deformability. Air-entraining agent is one of the effective measures to improve the antifreeze ability of cement binder at low temperature.

Further, the cement is Portland cement whose grade is greater than 52.5.

Further, the water reducer is a polycarboxylate ADVA high-efficiency water reducer.

ADVA high-efficiency water reducer has low dosage (0.4%-1.2%), high water reducing rate (25%-40%), compounded with large dosage of cement and sand, and has good cement adhesive workability. The prepared extremely cold cement adhesive has a small Cl ^- diffusion coefficient, low shrinkage value, and gentle hydration temperature rise of commercial concrete, which meets the requirements for use in extremely cold regions.

Use ADVA high-efficiency water reducer to reduce water consumption and water-cement ratio and improve strength while ensuring the workability of cement adhesive. Select the appropriate lime-sand ratio at low temperature to reduce the heat of hydration, increase the compactness and stability of the adhesive structure, reduce volume shrinkage, reduce internal porosity, and improve durability.

Further, the particle size of the quartz sand is 30-100 mesh.

Advantages of the present invention: the freezing-thawing performance of the extreme cold type cement adhesive of the present invention is significantly improved compared with that of the general type cement adhesive, and the internal damage caused by the low temperature expansion of cement is reduced. Stress action, thereby reducing the possibility of damage to porcelain parts, and fundamentally reducing the failure probability of porcelain insulators under steep wave impact.

detailed description:

Example 1:

A kind of extremely cold type cement adhesive, it comprises the raw material of following weight part:

2 parts of Portland cement with a label greater than 52.5,

1 part of quartz sand with a particle size of 30-100 mesh,

0.49 parts of water,

0.06 parts of polycarboxylic acid-based ADVA high-efficiency water reducer,

0.28 parts of silica fume,

Rosin thermal polymer air-entraining agent 0.0014 parts.

Example 2

A kind of extremely cold type cement adhesive, it comprises the raw material of following weight part:

2 parts of Portland cement with a label greater than 52.5,

0.8 parts of quartz sand with a particle size of 30-100 mesh,

0.45 parts of water,

0.05 parts of polycarboxylate ADVA superplasticizer,

0.25 parts of silica fume,

Rosin soap air-entraining agent 0.001 part.

Example 3

A kind of extremely cold type cement adhesive, it comprises the raw material of following weight part:

2 parts of Portland cement with a label greater than 52.5,

1.1 parts of quartz sand with a particle size of 30-100 mesh,

0.52 parts of water,

Polycarboxylic acid-based ADVA superplasticizer 0.07 parts,

0.30 parts of silica fume,

Sodium alkylbenzene sulfonate air-entraining agent 0.002 parts.

Air-entraining agents, also known as air-entraining agents, are usually water surfactants. When dissolved in water and stirred, a large number of fine air bubbles are formed in the mortar, with a size of about 50-125 μm. Since the surface active substances can be oriented and adsorbed on the surface of the air bubbles, the air bubbles can not be easily broken. Evenly distributed tiny air bubbles reduce the contact between sand particles, which can improve the fluidity and stability of the mud (anti-bleeding ability). Microscopic air bubbles in the hardened slurry insulate the capillary channel, prevent moisture migration, and increase deformability. Air-entraining agent is one of the effective measures to improve the antifreeze ability of cement binder at low temperature.

ADVA high-efficiency water reducer has low dosage (0.4%-1.2%), high water reducing rate (25%-40%), compounded with large dosage of cement and sand, and has good cement adhesive workability. The prepared extremely cold cement adhesive has a small Cl ^- diffusion coefficient, low shrinkage value, and gentle hydration temperature rise of commercial concrete, which meets the requirements for use in extremely cold regions.

Use ADVA high-efficiency water reducer to reduce water consumption and water-cement ratio and improve strength while ensuring the workability of cement adhesive. Select the appropriate lime-sand ratio at low temperature to reduce the heat of hydration, increase the compactness and stability of the adhesive structure, reduce volume shrinkage, reduce internal porosity, and improve durability.

When in use, mix the ingredients in the cement adhesive in proportion and stir thoroughly. Under constant stirring, generally there is a working time of 60 minutes.

With reference to "JC/T 726-1997" and "GB/T 177-1985", the extremely cold type cement adhesive obtained in Examples 1, 2, and 3 and ordinary cement adhesive were used to make a cuboid sample of 40mm × 40mm × 160mm, The ordinary cement adhesive is Bondex insulator adhesive V-100 produced by Linmei Composite Materials (Suzhou) Co., Ltd., among which, the extreme cold cement adhesive sample labeled "D1*" and the sample labeled "C1*" Ordinary cement adhesive samples were subjected to the low temperature tolerance coefficient test, and the extreme cold cement adhesive samples labeled "D0*" and the ordinary cement adhesive samples labeled "C0*" were used as comparison samples to conduct the normal temperature tolerance coefficient test. test;

Freeze-thaw cycle resistance test was carried out for the extreme cold cement adhesive samples marked "F1*" and the ordinary cement adhesive samples marked "E1*", and the extreme cold cement adhesive marked "F0*" The sample and the ordinary cement adhesive sample labeled "E0*" were used as the comparison sample for the freeze-thaw cycle resistance test.

The process of normal temperature tolerance coefficient test and freeze-thaw cycle resistance test is carried out in accordance with "JB/T4307-2004 Cement Adhesive for Insulator Bonding", only some test conditions have been modified, and the parameters of the normal temperature tolerance coefficient test are listed below Table (the modified part has been noted):

project frequency temperature time Remark soaking 1 room temperature 5h freezing 1 -55°C 8 hours JB/T4307-2004 is -40℃ thaw 1 50℃ 5h

The results of the normal temperature tolerance coefficient test are shown in the table below:

The parameters of the freeze-thaw cycle tolerance test are listed in the table below (the modified part has been noted):

project frequency temperature time Remark soaking 1 room temperature 5h freezing 50 -55°C 5h JB/T4307-2004 is -15℃, 30 times thaw 50 50℃ 5h JB/T4307-2004 is 30 times

The results of the freeze-thaw cycle tolerance test are shown in the table below:

As can be seen from the results of the normal temperature tolerance coefficient test and the freeze-thaw cycle tolerance test, the extremely cold type cement adhesives made in Examples 1, 2, and 3 have excellent normal temperature tolerance coefficients and freeze-thaw cycle tolerance coefficients. Well tolerated.

Claims (6)

1. a kind of extremely cold type cement adhesive, it is characterized in that, it comprises the raw material of following weight portion: 2 parts of cement, Quartz sand 0.8～1.1 parts, 0.45～0.52 parts of water, Water reducing agent 0.05～0.07 parts, Silica fume 0.25～0.30 parts, Air-entraining agent 0.001 to 0.002 parts. 2. a kind of extremely cold type cement adhesive according to claim 1, is characterized in that, it comprises the raw material of following weight portion: 2 parts of cement, 1 part of quartz sand, 0.49 parts of water, 0.06 parts of water reducing agent, 0.28 parts of silica fume, Air-entraining agent 0.0014 parts. 3. according to claim 1 or 2 described a kind of extremely cold type cement adhesive, it is characterized in that, described air-entraining agent is one or more in rosin thermopolymer, rosin soap, sodium alkylbenzene sulfonate . 4. A kind of extremely cold type cement adhesive according to claim 1 or 2, is characterized in that, described cement is the Portland cement of grade greater than 52.5. 5. A kind of extremely cold cement adhesive according to claim 1 or 2, characterized in that the water reducer is a polycarboxylate ADVA high-efficiency water reducer. 6. The extremely cold type cement adhesive according to claim 1 or 2, characterized in that the particle size of the quartz sand is 30-100 mesh.