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Low-cement-sand-ratio anti-cracking Portland cement adhesive for insulator

A cement adhesive and Portland cement technology, which can be used in sustainable waste treatment, solid waste management, climate sustainability, etc. The effect of reducing dry shrinkage, improving fluidity and compressive strength, and improving aging resistance

Pending Publication Date: 2022-05-06
南京电气绝缘子有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to achieve this strength, the existing formula uses a large amount of cement, a high lime-sand ratio, and a certain amount of silica fume is added at the same time. Although it can improve the strength of the adhesive, it also brings about poor fluidity and high dry shrinkage of the adhesive. , prone to surface cracks and other problems

Method used

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  • Low-cement-sand-ratio anti-cracking Portland cement adhesive for insulator

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Embodiment 1: This embodiment is a low lime-sand ratio anti-crack Portland cement adhesive for insulators. The adhesive is composed of the following components in weight percentage: Portland cement 39.37%, glued sand 41.16%, glue Use SiO for sand filling 2 Natural sand with a content of 94%, zirconium-containing silica fume 1.84%, blast furnace slag powder 3.82%, expansion agent 2.04%, polyacrylonitrile fiber with a fiber length of 5mm 0.036%, water reducing agent 0.15%, water retention agent 0.01%, water 11.57 %, defoamer 0.004%.

[0014] Portland cement is 52.5 Portland cement.

[0015] SiO in zirconium silica fume 2 The content is 95.1%.

[0016] The specific surface area of ​​blast furnace slag powder is 800m 2 / kg.

[0017] The water-reducing agent is a high-water-reducing polycarboxylate water-reducer, and the weight percentage of the high-water-reducing polycarboxylate water-reducer in the adhesive is 0.15%.

Embodiment 2

[0018] Example 2: This implementation is a low-lime-sand ratio anti-crack Portland cement adhesive for insulators. The adhesive is composed of the following components in weight percentage: Portland cement 41.08%, glued sand 41.22%, glued Sand chooses SiO 2 Processed sand with a content of 99%, zirconium-containing silica fume 2.05%, blast furnace slag powder 3.38%, polyacrylonitrile fiber with a fiber length of 6mm 0.045%, water reducing agent 0.16%, water retaining agent 0.03%, water 12.06%, defoamer 0.005%.

[0019] Portland cement is 52.5R Portland cement.

[0020] SiO in zirconium silica fume 2 The content is 94.2%.

[0021] The specific surface area of ​​blast furnace slag powder is 1000m 2 / kg.

[0022] Water-reducing agents include high-water-reducing polycarboxylate water-reducers and slump-retaining polycarboxylate water-reducers. Among them, the weight percentage of high-water-reducing polycarboxylate water-reducers in the cement is 0.13%, and the slump-retaini...

Embodiment 3

[0023] Embodiment 3: This embodiment is a low lime-sand ratio anti-crack Portland cement adhesive for insulators. The adhesive is composed of the following components in weight percentage: Portland cement 42.79%, glued sand 37.65%, glue Use SiO for sand filling 2 Natural sand with a content of 94%, silica fume containing zirconium 2.28%, blast furnace slag powder 3.79%, expansion agent 1.82%, polyacrylonitrile fiber with a fiber length of 4mm 0.046%, water reducing agent 0.17%, water 11.45%, defoamer 0.004%.

[0024] Portland cement is 52.5R Portland cement.

[0025] SiO in zirconium silica fume 2 The content is 95.1%.

[0026] The specific surface area of ​​blast furnace slag powder is 800m 2 / kg.

[0027] The water reducing agent includes high water-reducing polycarboxylate superplasticizer and slump-retaining polycarboxylate water-reducing agent. The weight percentage of polycarboxylate water reducer in the adhesive is 0.03%.

[0028] In actual application, Portland ...

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Abstract

The invention discloses an anti-cracking Portland cement adhesive with a low cement-sand ratio for an insulator. The adhesive is prepared from the following components in percentage by weight: 35%-45% of Portland cement, 35%-45% of cementing sand, 1.5%-2.5% of zirconium-containing silica fume, 3%-5% of blast furnace slag powder, 0-3% of an expanding agent, 0.02%-0.06% of polyacrylonitrile fibers, 0.10%-0.23% of a water reducing agent, 0-0.03% of a water-retaining agent, 10%-13% of water and 0.002%-0.006% of a defoaming agent. The anti-cracking cement has the characteristics of low cement-sand ratio, good fluidity, high strength and anti-cracking property, and can meet the production requirements of high-tonnage insulators.

Description

technical field [0001] The invention relates to a low-lime-sand ratio anti-crack Portland cement adhesive for insulators, belonging to the technical field of adhesives. Background technique [0002] Both ceramic and glass insulators are composed of insulating parts, metal accessories and cement adhesive. The existing insulator production habit uses Portland cement cement. With the development of the power industry and the increase of voltage level, the strength of insulator products is getting higher and higher. JB / T4307 cement standard stipulates that the 11-day compressive strength of Class III cement is not lower than 83.5MPa. In order to achieve this strength, the existing formula uses a large amount of cement, a high lime-sand ratio, and a certain amount of silica fume is added at the same time. Although it can improve the strength of the adhesive, it also brings about poor fluidity and high dry shrinkage of the adhesive. , prone to problems such as surface cracks. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04C04B16/06C04B18/14C04B24/24C04B111/20C04B111/34
CPCC04B28/04C04B18/146C04B18/141C04B16/0658C04B24/24C04B2201/50C04B2111/20C04B2111/00637C04B2111/343C04B14/06C04B2103/0068C04B2103/302C04B2103/465C04B2103/50Y02W30/91
Inventor 蔡海龙罗丽鹰邱春燕徐永康
Owner 南京电气绝缘子有限公司
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