阅读说明：本技术 一种高温型钢筋连接用套筒灌浆料及其制备方法 (sleeve grouting material for high-temperature steel bar connection and preparation method thereof ) 是由 杨国刚 朱海军 黄键 黄金涛 于 2019-10-22 设计创作，主要内容包括：本发明涉及建筑材料技术领域,公开了一种高温型钢筋连接用套筒灌浆料,按重量百分比包括胶凝材料45～57％、骨料36～52％、稳定剂0.5～5％、有机覆膜剂0.25～0.75％、温度调节剂0.25～1.25％和功能外加剂0.35～0.65％；一种高温型钢筋连接用套筒灌浆料的制备方法,包括步骤：步骤一：称取稳定剂、有机覆膜剂、温度调节剂和功能外加剂,混匀；步骤二：称取胶凝材料,在边搅拌的状态下加入混合物,混匀；步骤三：再边搅拌边加入骨料,混匀；步骤四：称取所述一种高温型钢筋连接用套筒灌浆料与水拌合,边搅拌边向拌合水中加入一种高温型钢筋连接用套筒灌浆料,混合拌制均匀制得成品；解决了钢筋连接用套筒灌浆料在高温环境下使用时需采取降温措施且灌浆效果不理想的问题。(The invention relates to the technical field of building materials, and discloses a sleeve grouting material for connecting high-temperature steel bars, which comprises 45-57 wt% of a cementing material, 36-52 wt% of an aggregate, 0.5-5 wt% of a stabilizer, 0.25-0.75 wt% of an organic film coating agent, 0.25-1.25 wt% of a temperature regulator and 0.35-0.65 wt% of a functional additive; a preparation method of sleeve grouting material for high-temperature steel bar connection comprises the following steps: the method comprises the following steps: weighing a stabilizer, an organic film covering agent, a temperature regulator and a functional additive, and uniformly mixing; step two: weighing the cementing material, adding the mixture while stirring, and uniformly mixing; step three: adding the aggregate while stirring, and uniformly mixing; step four: weighing the high-temperature reinforcing steel bar connecting sleeve grouting material, mixing the high-temperature reinforcing steel bar connecting sleeve grouting material with water, adding the high-temperature reinforcing steel bar connecting sleeve grouting material into the mixed water while stirring, and mixing and stirring uniformly to obtain a finished product; the sleeve grouting material for connecting the steel bars solves the problems that cooling measures are required to be taken when the sleeve grouting material for connecting the steel bars is used in a high-temperature environment, and the grouting effect is not ideal.)

1. the utility model provides a high temperature type sleeve grout material for reinforcing bar connection which characterized in that: the composite material comprises 45-57 wt% of a cementing material, 36-52 wt% of an aggregate, 0.5-5 wt% of a stabilizer, 0.25-0.75 wt% of an organic film coating agent, 0.25-1.25 wt% of a temperature regulator and 0.35-0.65 wt% of a functional additive.

2. the sleeve grouting material for high-temperature steel bar connection as claimed in claim 1, wherein: the cementing material is prepared from 80-92% of cement, 3-15% of slag powder and 4-8% of anhydrite in percentage by weight.

3. The sleeve grouting material for high-temperature steel bar connection as claimed in claim 1, wherein: the cement is Portland cement and/or ordinary Portland cement with the strength grade higher than 42.5.

4. a high temperature type steel bar connecting sleeve grouting material according to claim 2 and/or 3, characterized in that: the cement strength grade is 52.5, the specific surface area of the slag powder is more than or equal to 800m2/kg, and the 28d activity index is more than or equal to 105%; the specific surface area of the anhydrite is more than or equal to 300m 2/kg.

5. the sleeve grouting material for high-temperature steel bar connection as claimed in claim 1, wherein: the aggregate is at least one of washing and drying river sand, quartz sand, carborundum and metal powder, and the grading composition of the aggregate is 55-65% of aggregate with the particle size of 0.42-0.84 mm and 35-45% of aggregate with the particle size of 0.21-0.42 mm.

6. the sleeve grouting material for high-temperature steel bar connection as claimed in claim 1, wherein: the stabilizer is at least one of bentonite, zeolite powder and metakaolin, and the specific surface area of the stabilizer is more than or equal to 350m 2/kg.

7. the sleeve grouting material for high-temperature steel bar connection as claimed in claim 1, wherein: the organic film covering agent is prepared from 15-40% of cellulose ether, 15-25% of citric acid, 3-8% of biological polysaccharide gum and 40-65% of calcium stearate in percentage by weight; the cellulose ether is hydroxypropyl methyl cellulose ether with the viscosity of 400, and the biological polysaccharide gum is at least one of welan gum, xanthan gum and diutan gum.

8. the sleeve grouting material for high-temperature steel bar connection as claimed in claim 1, wherein: the temperature regulator is prepared by dissolving 1-4 wt% of sodium nitrate and/or calcium nitrate, 6-9 wt% of polyol ethoxy compound and 7.5-11 wt% of multi-piece layered graphene in 80% of absolute ethyl alcohol, performing ultrasonic dispersion mixing for 15-20 min, performing microwave drying to an anhydrous state, naturally cooling to room temperature in a dryer, taking out, and grinding in a mortar until the specific surface area is more than or equal to 350m 2/kg.

9. The sleeve grouting material for high-temperature steel bar connection as claimed in claim 1, wherein: the functional additive is prepared from 75-85% of polycarboxylic acid high-performance water reducing agent, 3.5-10.5% of plastic expanding agent and 10-15.5% of polyether modified organic silicon defoaming agent in percentage by weight, wherein the plastic expanding agent is at least one of a yellow hydrazide compound, an azo compound, an animal protein foaming agent and a nitric acid substitute.

10. the method for preparing the sleeve grouting material for the high-temperature steel bar connection as claimed in any one of claims 1 to 9, wherein the method comprises the following steps: the method comprises the following steps:

the method comprises the following steps: weighing a stabilizer, an organic film covering agent, a temperature regulator and a functional additive, and uniformly mixing;

Step two: weighing the cementing material, adding the mixture obtained in the step one under the stirring state, and uniformly mixing;

step three: adding the aggregate while stirring, and uniformly mixing;

step four: and weighing mixing water with the weight percentage of 12-14% of the grouting material, adding the mixture into the mixing water while stirring, and mixing and stirring uniformly to obtain a grouting material finished product.

Technical Field

The invention relates to the technical field of building materials, in particular to a sleeve grouting material for high-temperature steel bar connection and a preparation method thereof.

Background

the sleeve grouting material for connecting the reinforcing steel bars serves as a main bonding material of the reinforcing steel bars and the sleeves, plays an important role in the field of assembled concrete buildings which are more and more widely applied, and the quality of the sleeve grouting material is directly related to the connection reliability of the reinforcing steel bars and the sleeves, even influences the safety of building structures.

as a cement-based building material, the sleeve grouting material for connecting the steel bars is deeply influenced by the environmental temperature in the grouting construction project of the fabricated concrete building, and for this reason, the national industry standard 'technical specification for connecting and applying the steel bar sleeve grouting' (JGJ 355-2015) explicitly mentions: during grouting construction, the environmental temperature meets the requirements of the operating specification of grouting materials; when ambient temperature is higher than 30 ℃, should take the measure that reduces grouting material mixture temperature ", do so because when ambient temperature was too high, can cause grouting material mixture mobility to reduce and accelerate the setting and hardening, consequently, current construction technical means adopts measures such as reducing the temperature and even adding ice-cube stirring to reduce grouting material mixture temperature mostly to improve grouting material mixture's working property under the high temperature environment.

disclosure of Invention

the invention provides a sleeve grouting material for high-temperature steel bar connection and a preparation method thereof, aiming at solving the problems that the sleeve grouting material for steel bar connection needs cooling measures when used in a high-temperature environment and the grouting effect is not ideal.

in order to solve the technical problems, the technical scheme of the invention is as follows: the sleeve grouting material for connecting the high-temperature steel bars comprises 45-57 wt% of a cementing material, 36-52 wt% of an aggregate, 0.5-5 wt% of a stabilizer, 0.25-0.75 wt% of an organic film coating agent, 0.25-1.25 wt% of a temperature regulator and 0.35-0.65 wt% of a functional additive.

further, the cementing material is prepared from 80-92% of cement, 3-15% of slag powder and 4-8% of anhydrite in percentage by weight.

Further, the cement is portland cement and/or ordinary portland cement with a strength grade higher than 42.5.

Furthermore, the strength grade of the cement is 52.5, the specific surface area of the slag powder is more than or equal to 800m2/kg, and the 28d activity index is more than or equal to 105%; the specific surface area of the anhydrite is more than or equal to 300m 2/kg.

Further, the aggregate is at least one of washed and dried river sand, quartz sand, carborundum and metal powder, and the grading composition of the aggregate is 55-65% of aggregate with the particle size of 0.42-0.84 mm and 35-45% of aggregate with the particle size of 0.21-0.42 mm.

further, the stabilizer is at least one of bentonite, zeolite powder and metakaolin, and the specific surface area of the stabilizer is more than or equal to 350m 2/kg.

further, the organic film coating agent is prepared by 15-40% of cellulose ether, 15-25% of citric acid, 3-8% of biological polysaccharide gum and 40-65% of calcium stearate in percentage by weight; the cellulose ether is hydroxypropyl methyl cellulose ether with the viscosity of 400, and the biological polysaccharide gum is at least one of welan gum, xanthan gum and diutan gum.

further, the temperature regulator is prepared by dissolving 1-4 wt% of sodium nitrate and/or calcium nitrate, 6-9 wt% of polyhydric alcohol ethoxy compound and 7.5-11 wt% of multi-piece layered graphene in 80% of absolute ethyl alcohol, performing ultrasonic dispersion mixing for 15-20 min, performing microwave drying to an anhydrous state, naturally cooling to room temperature in a dryer, taking out, and grinding in a mortar until the specific surface area is not less than 350m 2/kg.

further, the functional additive is prepared from 75-85% of polycarboxylic acid high-performance water reducing agent, 3.5-10.5% of plastic expanding agent and 10-15.5% of polyether modified organic silicon defoaming agent in percentage by weight, wherein the plastic expanding agent is at least one of a yellow hydrazide compound, an azo compound, an animal protein foaming agent and a nitric acid substitute.

A preparation method of sleeve grouting material for high-temperature steel bar connection comprises the following steps:

The method comprises the following steps: weighing a stabilizer, an organic film covering agent, a temperature regulator and a functional additive, and uniformly mixing;

step two: weighing the cementing material, adding the mixture obtained in the step one under the stirring state, and uniformly mixing;

step three: adding the aggregate while stirring, and uniformly mixing;

step four: and weighing mixing water with the weight percentage of 12-14% of the grouting material, adding the mixture into the mixing water while stirring, and mixing and stirring uniformly to obtain a grouting material finished product.

compared with the prior art, the invention has the beneficial effects that: 1. the grouting material provided by the invention can obtain the effects that the initial fluidity is more than or equal to 330mm and the fluidity is more than or equal to 300mm in 30min under the high-temperature environment of 40 ℃ without adopting auxiliary cooling measures. Before, during and after construction, the raw materials, grouting machines and construction working surfaces do not need to be cooled, so that the construction cost can be effectively reduced, the construction efficiency can be improved and the grouting compactness can be ensured during construction in a high-temperature environment;

2. According to the grouting material provided by the invention, the organic film coating agent is used, so that an organic hydrophobic film can be effectively formed on the surface of the grouting material mixture, the loss of free moisture in the mixture is greatly reduced, the free moisture is kept in the mixture for a long time in a high-temperature environment, and the working time of the mixture in the high-temperature environment is prolonged;

3. The grouting material provided by the invention can effectively absorb heat generated by hydration from the outside and the inside of the grouting material in a high-temperature environment by using the temperature regulator prepared by a special process, so that a grouting material mixture is maintained at a stable temperature, the negative problems of accelerated hydration process, water loss, condensation hardening and the like caused by overhigh temperature are relieved, and the working performance of the sleeve grouting material in the high-temperature environment is ensured.

Detailed Description

The technical solution of the present invention will be further described in detail with reference to examples.