CN109704659B - Sleeve grouting material for steel bar connection - Google Patents
Sleeve grouting material for steel bar connection Download PDFInfo
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- CN109704659B CN109704659B CN201910115147.8A CN201910115147A CN109704659B CN 109704659 B CN109704659 B CN 109704659B CN 201910115147 A CN201910115147 A CN 201910115147A CN 109704659 B CN109704659 B CN 109704659B
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Abstract
The invention discloses a sleeve grouting material for connecting reinforcing steel bars, which comprises the following components in parts by weight: 30-35 parts of cement, 40-50 parts of sand, 10-20 parts of anhydrite, 15-20 parts of active micro-bead powder, 1-3 parts of polycarboxylic acid water reducing agent, 0.2-0.4 part of defoaming agent, 0.3-0.5 part of retarder, 1-2 parts of cement composite stabilizer, 0.8-1.2 parts of plasticizing expanding agent, 0.6-0.8 part of early strength agent, 1.2-1.6 parts of water-retaining thickening agent and 0.2-0.4 part of cement hydration accelerator. The grouting material has good strength and flow property, good material stability, no cracking and no shrinkage, and meets the requirements of assembly type buildings.
Description
Technical Field
The invention relates to the technical field of building materials, in particular to a sleeve grouting material for connecting reinforcing steel bars.
Background
At present, with the rapid development of economy and the transformation of industrial structure in China, an assembly type structure is one of the architectural structure forms which are currently and mainly developed in China. In fabricated buildings, the steel bar sleeve connection technology is commonly adopted in the component connection technology. Wherein, the sleeve grouting is mainly used, and the market share reaches 80 percent. As an important connecting medium of a steel bar and a sleeve, the performance of the grouting material directly influences the service performance of the assembled member. The main problems of the traditional grouting material are that the setting speed is slow, later-stage hardening can shrink, the construction progress and the quality are affected, the standard requirements cannot be met by the common early strength in the existing grouting materials of the same type, cracks are easily generated in the later stage, and the engineering requirements cannot be met.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide the sleeve grouting material for connecting the steel bars, which has the advantages of short setting time, high early strength and good construction performance, and solves the technical problems of insufficient strength and easy cracking of the existing sleeve grouting material.
The technical scheme of the invention is as follows:
the sleeve grouting material for connecting the steel bars is characterized by comprising the following components in parts by weight: 30-35 parts of cement, 40-50 parts of sand, 10-20 parts of anhydrite, 15-20 parts of active micro-bead powder, 1-3 parts of polycarboxylic acid water reducing agent, 0.2-0.4 part of defoaming agent, 0.3-0.5 part of retarder, 1-2 parts of cement composite stabilizer, 0.8-1.2 parts of plasticizing expanding agent, 0.6-0.8 part of early strength agent, 1.2-1.6 parts of water-retaining thickening agent and 0.2-0.4 part of cement hydration accelerator.
Furthermore, the content of silicon dioxide in the active micro bead powder is 55-65%.
Further, the cement composite stabilizer consists of sodium allyl sulfonate and calcium stearate.
Further, the water-retaining thickening agent consists of sodium bentonite and hydroxypropyl methyl cellulose ether.
Further, the cement hydration accelerator consists of acrylate.
Further, the water reducing rate of the polycarboxylate superplasticizer is more than or equal to 30%.
Further, the defoaming agent is selected from polyether modified silicone oil, high-low viscosity methyl silicone oil and silicone resin containing superfine silicon dioxide.
Further, the retarder is selected from any one of sodium gluconate, tartaric acid and citric acid.
Further, the early strength agent is selected from any one of sodium sulfate, calcium formate and lithium carbonate.
Further, the plasticizing and expanding agent is selected from azodicarbonamide.
The invention principle is as follows:
the active micro-bead powder has high content of active silicon dioxide due to the form and the strength, has good ball benefit and strength gain effect, can well improve the fluidity of the grouting material, simultaneously increases the compactness of the material, reduces the porosity and improves the strength of each age. The cement hydration accelerator consists of acrylate, and the acrylate contains polar groups such as hydrogen bonds, water molecules and the like, so that the acrylate can form coordinate bonds and intermolecular force with calcium ions, silicates and the like in cement, a system is bonded, and the compressive strength of slurry is greatly improved. The cement composite stabilizer consists of sodium allylsulfonate and calcium stearate, has the effects of thickening and viscosity increasing, can be dissociated into anions with multiple charges and large molecular weight in cement slurry, enables coil macromolecules to become curve-shaped under the strong repulsion action of the same charges, increases the viscosity of solution, and ensures that gaps among cement particles are preserved due to the constraint of free water in cement slurry, the frictional resistance among the particles is reduced, the whole system is more stable, and the stable development of the early strength of the material is promoted
Has the advantages that:
the invention has the advantages that:
(1) the invention adopts the active micro-bead powder to improve the flowing and the strength of the grouting material at each age, improve the construction convenience and accelerate the construction progress.
(2) The invention adopts the cement composite stabilizer and the cement hydration accelerator, promotes the early setting time and the strength development of the grouting material, simultaneously ensures the effective increase of the later strength, avoids cracking and ensures the construction quality.
Detailed Description
In order that the invention may be more clearly understood, preferred embodiments are now described. PO52.5 was used as the cement in the following examples and comparative examples.
The grain size of the sand is less than 2.36 mm.
Example 1
The sleeve grouting material for connecting the steel bars is composed of the following raw materials in parts by weight: 35 parts of cement, 50 parts of sand, 20 parts of anhydrite, 20 parts of active micro-bead powder, 3 parts of polycarboxylic acid water reducing agent, 0.4 part of defoaming agent, 0.5 part of retarder, 2 parts of cement composite stabilizer, 1.2 parts of plasticizing expansion agent, 0.8 part of early strength agent, 1.6 parts of water retention thickener and 0.4 part of cement hydration accelerator.
The cement composite stabilizer consists of sodium allylsulfonate and calcium stearate.
The water-retaining thickening agent consists of sodium bentonite and hydroxypropyl methyl cellulose ether.
The water reducing rate of the polycarboxylate superplasticizer is more than or equal to 30 percent.
The cement hydration accelerator consists of acrylate.
Example 2
The sleeve grouting material for connecting the steel bars is composed of the following raw materials in parts by weight: 35 parts of cement, 50 parts of sand, 20 parts of anhydrite, 15 parts of active micro-bead powder, 2 parts of polycarboxylic acid water reducing agent, 0.4 part of defoaming agent, 0.5 part of retarder, 2 parts of cement composite stabilizer, 1.2 parts of plasticizing expansion agent, 0.8 part of early strength agent, 1.2 parts of water retention thickener and 0.4 part of cement hydration accelerator.
The cement composite stabilizer consists of sodium allylsulfonate and calcium stearate.
The water-retaining thickening agent consists of sodium bentonite and hydroxypropyl methyl cellulose ether.
The water reducing rate of the polycarboxylate superplasticizer is more than or equal to 30 percent.
The cement hydration accelerator consists of acrylate.
Example 3
The sleeve grouting material for connecting the steel bars is composed of the following raw materials in parts by weight: 35 parts of cement, 50 parts of sand, 20 parts of anhydrite, 20 parts of active micro-bead powder, 2.5 parts of polycarboxylic acid water reducing agent, 0.4 part of defoaming agent, 0.5 part of retarder, 2 parts of cement composite stabilizer, 1.2 parts of plasticizing expansion agent, 0.8 part of early strength agent, 1.4 parts of water-retaining thickening agent and 0.4 part of cement hydration accelerator.
The cement composite stabilizer consists of sodium allylsulfonate and calcium stearate.
The water-retaining thickening agent consists of sodium bentonite and hydroxypropyl methyl cellulose ether.
The water reducing rate of the polycarboxylate superplasticizer is more than or equal to 30 percent.
The cement hydration accelerator consists of acrylate.
Comparative example 1
The sleeve grouting material for connecting the steel bars is composed of the following raw materials in parts by weight: 35 parts of cement, 50 parts of sand, 20 parts of anhydrite, 5 parts of active micro-bead powder, 2.5 parts of polycarboxylic acid water reducing agent, 0.4 part of defoaming agent, 0.4 part of retarder, 1 part of cement composite stabilizer, 0.8 part of plasticizing expansion agent, 0.5 part of early strength agent, 1.5 parts of water-retaining thickening agent and 0.2 part of cement hydration accelerator.
The cement composite stabilizer consists of sodium allylsulfonate and calcium stearate.
The water-retaining thickening agent consists of sodium bentonite and hydroxypropyl methyl cellulose ether.
The water reducing rate of the polycarboxylate superplasticizer is more than or equal to 30 percent.
The cement hydration accelerator consists of acrylate.
Comparative example 2
The sleeve grouting material for connecting the steel bars is composed of the following raw materials in parts by weight: 35 parts of cement, 50 parts of sand, 20 parts of anhydrite, 10 parts of active micro-bead powder, 2 parts of polycarboxylic acid water reducing agent, 0.4 part of defoaming agent, 0.4 part of retarder, 1 part of cement composite stabilizer, 0.8 part of plasticizing expansion agent, 0.5 part of early strength agent, 0.8 part of water retention thickener and 0.15 part of cement hydration accelerator.
The cement composite stabilizer consists of sodium allylsulfonate and calcium stearate.
The water-retaining thickening agent consists of sodium bentonite and hydroxypropyl methyl cellulose ether.
The water reducing rate of the polycarboxylate superplasticizer is more than or equal to 30 percent.
The cement hydration accelerator consists of acrylate.
Comparative example 3
The sleeve grouting material for connecting the steel bars is composed of the following raw materials in parts by weight: 35 parts of cement, 50 parts of sand, 20 parts of anhydrite, 5 parts of active micro-bead powder, 1.5 parts of polycarboxylic acid water reducing agent, 0.4 part of defoaming agent, 0.4 part of retarder, 1 part of cement composite stabilizer, 0.5 part of plasticizing expansion agent, 0.5 part of early strength agent, 1 part of water-retaining thickening agent and 0.15 part of cement hydration accelerator.
The cement composite stabilizer consists of sodium allylsulfonate and calcium stearate.
The water-retaining thickening agent consists of sodium bentonite and hydroxypropyl methyl cellulose ether.
The water reducing rate of the polycarboxylate superplasticizer is more than or equal to 30 percent.
The cement hydration accelerator consists of acrylate.
Performance testing
The performance parameter tests of the sleeve grouting materials for reinforcing steel bar connection obtained in examples 1 to 3 and comparative examples 1 to 3 were performed with reference to JG/T408-2013 sleeve grouting material for reinforcing steel bar connection, and the results are shown in table 1 below.
Table 1 results of performance testing
From comparative examples 1, 2 and 3, it can be seen that the fluidity of the sleeve grouting material and the fluidity of the sleeve grouting material in 30min are influenced by reducing the components of the activated micro-bead powder and the polycarboxylic acid water reducing agent. By reducing the components of the cement composite stabilizer and the cement hydration accelerator, the 1d compressive strength, the 3d compressive strength and the 28d compressive strength of the sleeve grouting material are influenced. By reducing the components of the plasticizing expansion agent, the change of the vertical expansion rate of the sleeve grouting material is influenced.
It should be noted that the above-mentioned embodiments illustrate rather than limit the invention in any form, and that modifications and variations are possible within the spirit and scope of the invention.
Claims (7)
1. The sleeve grouting material for connecting the steel bars is characterized by comprising the following components in parts by weight: 30-35 parts of cement, 40-50 parts of sand, 10-20 parts of anhydrite, 15-20 parts of active micro-bead powder, 1-3 parts of polycarboxylic acid water reducing agent, 0.2-0.4 part of defoaming agent, 0.3-0.5 part of retarder, 1-2 parts of cement composite stabilizer, 0.8-1.2 parts of plasticizing expanding agent, 0.6-0.8 part of early strength agent, 1.2-1.6 parts of water-retaining thickening agent and 0.2-0.4 part of cement hydration accelerator;
the content of silicon dioxide in the active micro bead powder is 55-65%;
the cement composite stabilizer consists of sodium allylsulfonate and calcium stearate and can be dissociated into multi-charge high-molecular-weight anions in cement slurry;
the cement hydration accelerator consists of acrylate.
2. The sleeve grout for reinforcing bar connection of claim 1, wherein the water-retaining thickener consists of sodium bentonite and hydroxypropyl methyl cellulose ether.
3. The sleeve grouting material for reinforcing steel bar connection according to claim 1, wherein the water reducing rate of the polycarboxylate superplasticizer is not less than 30%.
4. The sleeve grout for reinforcing steel bar connection according to claim 1, wherein the defoaming agent is composed of polyether modified silicone oil, high and low viscosity methyl silicone oil and silicone resin containing ultrafine silicon dioxide.
5. The sleeve grouting material for connecting steel bars according to claim 1, wherein the retarder is selected from any one of sodium gluconate, tartaric acid and citric acid.
6. The sleeve grout for reinforcing steel bar connection according to claim 1, wherein the early strength agent is selected from any one of sodium sulfate, calcium formate and lithium carbonate.
7. The sleeve grout for reinforcing bar connection according to claim 1, wherein the plasticizing swelling agent is composed of azodicarbonamide.
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| CN201910115147.8A CN109704659B (en) | 2019-02-14 | 2019-02-14 | Sleeve grouting material for steel bar connection |
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| CN201910115147.8A CN109704659B (en) | 2019-02-14 | 2019-02-14 | Sleeve grouting material for steel bar connection |
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| CN109704659B true CN109704659B (en) | 2021-09-28 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114702273B (en) * | 2019-12-24 | 2023-04-18 | 科之杰新材料集团福建有限公司 | Polycarboxylate superplasticizer for reinforcing steel bar sleeve grouting material for prefabricated part and grouting material thereof |
| CN114685083B (en) * | 2019-12-24 | 2023-04-18 | 科之杰新材料集团福建有限公司 | Polycarboxylate superplasticizer for sleeve grouting material for prefabricated part, grouting material thereof and use method of polycarboxylate superplasticizer |
| CN111606637B (en) * | 2020-05-29 | 2022-02-15 | 台州东部建材科技有限公司 | Excellent-performance sleeve grouting material for steel bar connection |
| CN114133202A (en) * | 2021-12-07 | 2022-03-04 | 上海宝冶工程技术有限公司 | Low-temperature sleeve grouting material for connecting reinforcing steel bars |
| CN116040978A (en) * | 2023-02-27 | 2023-05-02 | 江苏博城创展新材料有限公司 | Additive for improving working performance of high-strength grouting product |
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| CN108929084A (en) * | 2018-08-03 | 2018-12-04 | 上海住信住宅工业有限公司 | Reinforcing bar sleeve for connection grouting material |
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| CN109020435A (en) * | 2018-08-21 | 2018-12-18 | 马清浩 | A kind of high-low temperature resistant sleeve grouting material and preparation method thereof |
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| JP2001214604A (en) * | 2000-01-31 | 2001-08-10 | Taiheiyo Cement Corp | Grouting material for flowable grout pad construction method |
| CN101535207A (en) * | 2006-11-17 | 2009-09-16 | 电气化学工业株式会社 | Cement mortar composition for grout and grout mortar obtained from the same |
| CN102936114A (en) * | 2012-10-12 | 2013-02-20 | 西南交通大学 | Magnesium acrylate-superfine cement compounded grouting material and preparation method thereof |
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