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Special grouting material for micro-expanded assembled construction bar connecting sleeve and preparation method thereof

A technology for building steel bars and connecting sleeves, applied in the field of building materials, can solve problems such as dry shrinkage, low early strength, and limited tensile strength performance, so as to reduce the release of hydration heat, maintain internal force balance, and improve The effect of work performance

Active Publication Date: 2018-01-12
LUOYANG INST OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditional cement-based grouting materials cannot meet the requirements. The main problems are as follows: Portland cement is used as the cementitious material, which has fast setting, low initial fluidity, and low early strength, which cannot meet the needs of rapid construction. To a large extent, it restricts its connection strength; or with sulphoaluminate cement as the main cementitious material, the hydration product is sensitive to temperature, and the low alkalinity results in poor carbonation resistance, and the later strength shrinkage phenomenon
In addition, the strength performance of traditional grouting materials is more focused on compressive strength, while the tensile strength performance is very limited, making it difficult to meet the connection requirements of prefabricated components in many situations

Method used

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  • Special grouting material for micro-expanded assembled construction bar connecting sleeve and preparation method thereof
  • Special grouting material for micro-expanded assembled construction bar connecting sleeve and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] The grouting material is composed of grouting material dry powder and water, and the grouting material dry powder includes main materials and admixtures, wherein, in terms of weight percentage, the main materials include: Portland cement 37%, superfine granulated blast furnace slag powder 15% and Quartz powder 48%;

[0043] The components of the admixture and the percentage of the weight of each component to the total weight of the main material are: gypsum 0.03%, composite anti-crack shrinkage reducing agent 1.5%, defoamer 0.025%, composite early strength agent 0.08%, stabilizer 0.75%, micro Steel fiber 0.015%, rust inhibitor 0.3%, polycarboxylate superplasticizer 0.30%.

[0044] Weigh the raw materials according to the above weight percentage, and weigh the gypsum, composite anti-crack and shrinkage reducing agent, defoamer, composite early strength agent, stabilizer, micro-steel fiber, rust inhibitor, and polycarboxylate water reducer in the above raw materials in pr...

Embodiment 2

[0049] The grouting material is composed of grouting material dry powder and water, and the grouting material dry powder includes main materials and admixtures, wherein, in terms of weight percentage, the main materials include: Portland cement 43%, superfine granulated blast furnace slag powder 12% and Quartz powder 45%;

[0050] The components of the admixture and the percentage of the weight of each component to the total weight of the main material are: gypsum 0.04%, composite anti-crack shrinkage reducing agent 2%, defoamer 0.035%, composite early strength agent 0.09%, stabilizer 0.85%, micro Steel fiber 0.0175%, rust inhibitor 0.4%, polycarboxylate superplasticizer 0.35%.

[0051] The preparation method of the grouting material is the same as that in Example 1. After testing, the fluidity of the obtained grouting material slurry is 360 mm after the machine, and the fluidity after 30 minutes is 315 mm, without segregation and bleeding. The 1d strength of the obtained gro...

Embodiment 3

[0053] The grouting material is composed of grouting material dry powder and water, and the grouting material dry powder includes main materials and admixtures, wherein, by weight percentage, the main materials include: Portland cement 39%, superfine granulated blast furnace slag powder 14% and Quartz powder 47%;

[0054] The components of the admixture and the percentage of the weight of each component in the total weight of the main material are: gypsum 0.035%, composite anti-crack shrinkage reducing agent 2.5%, defoamer 0.04%, composite early strength agent 0.09%, stabilizer 0.9%, micro Steel fiber 0.025%, rust inhibitor 0.35%, polycarboxylate superplasticizer 0.35%.

[0055] The preparation method of the grouting material is the same as in Example 1. After testing, the fluidity of the obtained grouting slurry is 361mm after the machine, and the fluidity after 30 minutes is 316mm, without segregation and bleeding. The 1d strength of the obtained grouting material slurry w...

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Abstract

The invention relates to a special grouting material for micro-expanded assembled construction bar connecting sleeve and a preparation method thereof. The grouting material comprises a dry powder of the grouting material and water, wherein the dry powder of the grouting material comprises main materials and additives; the main materials include 30-45% of portland cement, 10-25% of a superfine granulated blast furnace slag powder, and 45-50% of a quartz powder, wherein the sum of the abovementioned three components is 100%; the additives include gypsum, a composite crack resisting shrinkage reducing agent, a defoaming agent, a composite early strength agent, a stabilizing agent, micro steel fibers, a corrosion inhibitor and a polycarboxylate superplasticizer. The preparation method comprises the following steps: weighing raw materials based on matching ratio; uniformly stirring to obtain the dry powder of the grouting material; preparing 100 parts of the dry powder; adding 13-15 parts of water; fully stirring through a mortar stirring machine to obtain the grouting material. The grouting material has the characteristics of being high in mobility, high in intensity, micro-expanded, and high in corrosion resistance; the bar can be firmly combined with the sleeve after grouting; moreover, the grouting material is high in durability.

Description

technical field [0001] The invention relates to the technical field of building materials, in particular to a special grouting material for a prefabricated building steel bar connection sleeve and a preparation method thereof. Background technique [0002] In recent years, in response to the requirements of economic transformation and industrial structure adjustment, my country's construction industry has turned to the direction of green, environmental protection and high efficiency. Compared with the traditional cast-in-place concrete structure, the prefabricated concrete structure has the advantages of labor saving, energy saving, pollution reduction and high efficiency. Therefore, prefabricated concrete structure technology is developing rapidly and has broad development prospects. A prefabricated building is an overall structure composed of prefabricated components connected and assembled through connecting parts. Therefore, structural integrity plays a vital role in the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/02C04B111/70
Inventor 贾铁昆李建伟张东霞
Owner LUOYANG INST OF SCI & TECH
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