阅读说明：本技术 一种压浆剂及其制备方法 (Grouting agent and preparation method thereof ) 是由 姚彬 潘呈恭 易书城 刘洋 李小林 于 2021-09-23 设计创作，主要内容包括：一种压浆剂,包括如下重量份组分：聚羧酸系减水剂2-4份；消泡剂0.2-0.4份；防沉保水剂0.1-0.3份；混凝土膨胀剂30-40份；塑性膨胀剂0.3-0.5份；硅灰40-60份；超细石粉5-20份；粉煤灰0-5份,采用以下方法制备：1)取石灰石,与石膏、助磨剂混合,经粉磨至比表面积为1000-1500m～(2)/kg,得到超细石粉,备用,其中,石膏的添加量为0.3％-0.5％,助磨剂为木质素磺酸钙与硅灰的混合物,木质素磺酸钙和硅灰的质量比为3：47,助磨剂的添加量为0.3％-0.5％；2)配比取料,加入到混料设备中混合均匀,经均化处理后得到压浆剂。本发明压浆剂用于制备压浆料,可有效解决混凝土后张法压浆工程普遍存在的流动性不好、流动度损失大、保水性差、易泌水分层、体系收缩较大、抗折强度低等等额问题。(The grouting agent comprises the following components in parts by weight: 2-4 parts of a polycarboxylic acid water reducing agent; 0.2-0.4 part of defoaming agent; 0.1-0.3 part of anti-settling water-retaining agent; 30-40 parts of a concrete expanding agent; 0.3-0.5 part of plastic expanding agent; 40-60 parts of silica fume; 5-20 parts of superfine stone powder; 0-5 parts of fly ash, and is prepared by the following method: 1) taking limestone, mixing with gypsum and grinding aid, grinding to specific surface area of 1000- 2 And/kg, obtaining superfine stone powder for later use, wherein the addition amount of the gypsum is 0.3-0.5%, the grinding aid is a mixture of calcium lignosulphonate and silica fume, and the mass ratio of the calcium lignosulphonate to the silica fume is 3: 47, the addition amount of the grinding aid is 0.3% -0.5%; 2) proportioning and taking materials, adding the materials into mixing equipment, uniformly mixing, and carrying out homogenization treatment to obtain the grouting agent. The grouting agent is used for preparing grouting material, and can effectively solve the problem of post-concrete groutingThe problems of poor fluidity, large fluidity loss, poor water retention, easy bleeding and layering, large system shrinkage, low breaking strength and the like commonly existing in the grouting engineering by a tension method.)

1. The grouting agent is characterized by comprising the following components in parts by weight:

2-4 parts of a polycarboxylic acid water reducing agent;

0.2-0.4 part of defoaming agent;

0.1-0.3 part of anti-settling water-retaining agent;

30-40 parts of a concrete expanding agent;

0.3-0.5 part of plastic expanding agent;

40-60 parts of silica fume;

5-20 parts of superfine stone powder;

0-5 parts of fly ash.

2. The grouting agent according to claim 1, which comprises the following components in parts by weight:

3 parts of a polycarboxylic acid water reducing agent;

0.3 part of defoaming agent;

0.2 part of anti-settling water-retaining agent;

35 parts of a concrete expanding agent;

0.4 part of plastic expanding agent;

50 parts of silica fume;

10 parts of superfine stone powder;

0-5 parts of fly ash.

3. The grouting agent as claimed in claim 1 or 2, wherein the defoaming agent is a solid polyether defoaming agent and is a modified polyether high-performance powder defoaming agent.

4. The grouting agent as claimed in claim 1 or 2, wherein the anti-settling water retention agent is methyl cellulose ether and/or hydroxypropyl methyl cellulose ether, and the viscosity is 50000-100000 mPa-s.

5. The grouting agent according to claim 1 or 2, wherein the concrete expanding agent is a standard type II calcium oxide expanding agent or a calcium oxide-calcium sulfoaluminate expanding agent.

6. The grouting agent and the preparation method thereof according to claim 1 or 2, wherein the silica fume is dust collected by discharging through a flue during ferrosilicon alloy or industrial silicon smelting.

7. The grouting agent as claimed in claim 1 or 2, wherein the ultrafine stone powder is prepared by grinding limestone to a specific surface area of 1000-1500m²The coal ash is pulverized coal ash obtained by calcining anthracite or bituminous coal and collecting.

8. A method for preparing the grouting agent of claim 1 or 2, characterized by comprising the steps of:

1) taking limestone, mixing with gypsum and grinding aid, grinding to specific surface area of 1000-²The ultrafine stone powder is obtained for standby use, wherein the addition amount of the gypsum is 0.3 to 0.5 percent, and the grinding aid is the mixture of calcium lignosulfonate and silica fumeThe mass ratio of the calcium lignosulfonate to the silica fume is 3: 47, the addition amount of the grinding aid is 0.3% -0.5%;

2) taking materials according to the proportioning of each component of claim 1 or 2, adding the materials into a mixing device, uniformly mixing, and obtaining the grouting agent after homogenization treatment.

9. Use of a press grouting agent according to any of claims 1 to 7 for the preparation of a press grouting material, the amount of added press grouting agent being 10%.

Technical Field

The invention relates to the field of prestressed concrete, in particular to a grouting agent and a preparation method thereof.

Background

With the gradual maturity of prestressed concrete technology, prestressed concrete structural members are widely applied to building engineering and bridge engineering. Prestressed beam pipeline grouting is an extremely important process in a post-tensioning structure construction process, is more and more concerned by students and engineering personnel, and once the pipeline grouting has a quality problem, the safety, durability and reliability of a prestressed structural member are seriously influenced.

At present, the grouting material used for grouting the prestressed beam pipeline which is generally applied is pure cement slurry, and raw materials such as cement, water, a water reducing agent, an expanding agent and the like are adopted for field preparation during construction. The traditional method for preparing the grouting material on site generally has the problems of poor compatibility of various additives, poor adaptability of cement and a water reducing agent and the like, so that the pipeline grouting has more serious quality problems, such as: the slurry has poor stability, easy segregation and delamination, bleeding, poor fluidity and large loss of fluidity, the slurry is easy to block the pipe during grouting, the slurry is not firmly bonded with the prestressed tendons, the slurry is not compact after hardening, the pore channel is not full, and the like. The problems not only affect the construction progress of the project, but also directly affect the durability and the safety of the building project, the bridge project and the like.

Therefore, how to design a grouting agent with excellent performance as an additive of a grouting material is a problem to be solved urgently by those skilled in the art.

Disclosure of Invention

One of the purposes of the present invention is to provide a grouting agent for preparing grouting material, which can effectively solve the problems of poor fluidity, large fluidity loss, poor water retention, easy bleeding and layering, large system shrinkage, low breaking strength, etc., commonly existing in concrete post-tensioning grouting engineering, can effectively improve the fluidity, water retention and cohesiveness of the grout, improve the compactness and filling performance of the grout, reduce the shrinkage of the grout in the plastic stage and the shrinkage of the hardened grout, improve the breaking strength and compressive strength of the hardened grout, and improve the durability of the grout.

The invention also aims to provide a preparation method of the grouting agent, which is simple in process, and the prepared grouting agent is particularly suitable for preparing grouting material for railway concrete engineering.

The technical scheme for realizing one purpose of the invention is as follows: the grouting agent comprises the following components in parts by weight:

2-4 parts of a polycarboxylic acid water reducing agent;

0.2-0.4 part of defoaming agent;

0.1-0.3 part of anti-settling water-retaining agent;

30-40 parts of a concrete expanding agent;

0.3-0.5 part of plastic expanding agent;

40-60 parts of silica fume;

5-20 parts of superfine stone powder;

0-5 parts of fly ash.

Preferably, the grouting agent comprises the following components in parts by weight:

3 parts of a polycarboxylic acid water reducing agent;

0.3 part of defoaming agent;

0.2 part of anti-settling water-retaining agent;

35 parts of a concrete expanding agent;

0.4 part of plastic expanding agent;

50 parts of silica fume;

10 parts of superfine stone powder;

0-5 parts of fly ash.

Furthermore, the defoaming agent is a solid polyether defoaming agent and is a modified polyether high-efficiency powder defoaming agent.

Further, the anti-settling water retaining agent is methyl cellulose ether and/or hydroxypropyl methyl cellulose ether, and the viscosity is 50000-100000mPa & s.

Further, the concrete expanding agent is a standard II type calcium oxide expanding agent or a calcium oxide-calcium sulphoaluminate expanding agent.

Furthermore, the silicon ash is dust which is obtained by discharging and collecting the silicon ash through a flue when ferrosilicon alloy or industrial silicon is smelted.

Further, the ultrafine stone powder is prepared by grinding limestone until the specific surface area is 1000-1500m²The fly ash is pulverized fuel ash obtained by calcining anthracite or bituminous coal and collecting。

The invention also aims to provide a preparation method of the grouting agent, which comprises the following steps:

1) taking limestone, mixing with gypsum and grinding aid, grinding to specific surface area of 1000-²And/kg, obtaining superfine stone powder for later use, wherein the addition amount of the gypsum is 0.3-0.5%, the grinding aid is a mixture of calcium lignosulphonate and silica fume, and the mass ratio of the calcium lignosulphonate to the silica fume is 3: 47, the addition amount of the grinding aid is 0.3% -0.5%;

2) taking materials according to the proportioning of each component of claim 1 or 2, adding the materials into a mixing device, uniformly mixing, and obtaining the grouting agent after homogenization treatment.

The invention also claims the application of the grouting agent in preparing grouting material, wherein the addition amount of the grouting agent is 10%.

Adopt above-mentioned technical scheme to have following beneficial effect:

1. the grouting agent provided by the invention is designed according to a scientific and reasonable formula, is used as an additive for preparing grouting material, and is particularly suitable for grouting engineering of railway concrete post-tensioned prestressed beam pipelines. The slurry has good fluidity, no bleeding, no segregation and delamination, small loss of fluidity, fluidity within 25s after 60min, and good workability and homogeneity in the construction process. The problems of poor fluidity, large fluidity loss, poor water retention, easy bleeding and layering, large system shrinkage, low breaking strength and the like of the traditional grouting material are solved, the grouting material has good fluidity, water retention and cohesiveness, good compactness and filling degree of the slurry, small shrinkage of the slurry in a plastic stage and small shrinkage of the slurry after hardening, the breaking strength and the compressive strength of the slurry after hardening can be effectively improved, the breaking strength of 7d and 28d can respectively reach more than 10MPa and 12MPa, the compressive strength of 7d and 28d can respectively reach more than 50MPa and 60MPa, and the durability of building engineering, bridge engineering and the like is improved.

2. The mud-pressing agent provided by the invention has the advantages that the polycarboxylic acid water reducing agent is used for improving the fluidity of the mud, if the content is too low, the problems of slow flow rate, poor fluidity, large fluidity loss and the like of the mud can be caused, and if the content is too lowThe excessive amount can cause problems of bleeding, layering and the like of the pulp; the defoaming agent is used for controlling the gas content of the slurry and improving the compactness of the slurry, if the content is too low, the problems of high gas content of the slurry, low compressive strength and the like can occur, and if the content is too high, the problems of low flow rate, poor fluidity, large fluidity loss and the like of the slurry can occur; the anti-settling water-retaining agent is used for avoiding the problems of layering, settling, bleeding and the like of slurry, if the content is too low, the problems of unqualified indexes of the bleeding, layering and bleeding rate of the slurry can occur, if the content is too high, the problems of low flow rate, poor fluidity, large loss of fluidity and the like of the slurry can occur, and the pressure bleeding rate of the slurry can be effectively controlled by controlling the viscosity of the anti-settling water-retaining agent to be 50000-100000mPa & s; the plastic expanding agent forms uniform and compact tiny air holes in an alkaline environment, so that a system generates tiny expansion in a plastic stage, the problem of shrinkage of slurry in the plastic stage is effectively solved, the fullness of the slurry is improved, if the content is too low, the free expansion rate of the pressure slurry is low or unqualified, and if the content is too high, the problems of low slurry flow rate, poor fluidity, large fluidity loss and the like occur; the concrete expanding agent is used for quickly generating micro-expansion and compensating shrinkage after the slurry is hardened, effectively solving the problems of early self-shrinkage, chemical shrinkage and the like of the slurry after the slurry is hardened, having small dependence on maintenance conditions, and having the problems of low or unqualified expansion rate limit, large shrinkage, easy cracking and the like of the pressure slurry if the content is too low, and having the problems of low or unqualified compression strength, too high expansion rate limit and even expansion cracking and the like if the content is too high; the silicon ash is mainly dust which is obtained by discharging and collecting the silicon iron alloy or industrial silicon through a flue during smelting, and is a powder material taking amorphous silicon dioxide as a main component, and is used for improving the water retention property and the compactness of slurry and improving the folding strength and the compressive strength of the slurry at the early stage and the late stage after hardening, if the content is too low, the problems of body bleeding, layering, lower compressive strength or disqualification and the like can occur, and if the content is too high, the problems of low slurry flow rate, poor fluidity, large fluidity loss and the like can occur; the superfine stone powder is used for improving the fluidity and water retention of the slurry, if the content is too low, the problems of slurry bleeding, slow flow rate, poor fluidity, large fluidity loss and the like can occur, and if the content is too highThe problems of low or unqualified compressive strength can occur, and the specific surface area of the superfine stone powder is controlled to be 1000-1500m²The flow rate of the slurry can be effectively improved, and the loss of fluidity can be reduced; the fly ash is collected by calcining anthracite or bituminous coal and is used for improving the durability of slurry, if the content is too low, the later strength of the pressure slurry is slightly increased, and if the content is too high, the problems that the pressure strength of the pressure slurry is low or unqualified and the like can occur.

3. The grouting material prepared by the grouting agent has strong wrapping effect on the prestressed reinforcement during grouting, and can effectively ensure the safety, durability and reliability of the prepared prestressed structural member.

4. The addition amount of the grouting agent provided by the invention for preparing grouting material is 10%, if the addition amount is too high, problems of bleeding and layering of the grouting material occur, and if the addition amount is too low, problems of low grouting flow rate, poor fluidity, large fluidity loss, incapability of grouting construction and the like occur.

In the invention, the weight parts are g, kg and t.

The following is a further description with reference to specific examples.

Detailed Description

In the invention, the polycarboxylic acid water reducer is a white powdery water-reducing polycarboxylic acid water reducer of Shandong sunshine Guangxi building materials Co., Ltd, which is purchased externally, and has the conversion rate of 92.6 percent, the molecular weight of 3.6 ten thousand, the water content of 2 percent and the water-reducing rate of 38 percent; the defoaming agent is a white powdery modified polyether high-efficiency powder defoaming agent (A-406) of Suzhou Xingbang chemical admixture limited company, the fineness is 3 percent (0.315mm screen residue), and the water content is 6.6 percent; the anti-settling water-retaining agent is white powdery hydroxypropyl methyl cellulose ether (HPMC) of Shandong Gomais chemical Co., Ltd, the viscosity is 50000mPa & s, the fineness is 6% (0.212mm screen residue), and the pH value is 5; the concrete expanding agent is an off-white powdery II type calcium oxide expanding agent of Chongqing Sansheng industry Co Ltd, and the specific surface area is 280m²The expansion rate of the water is limited by 7 days to be 0.056 percent and the compressive strength of the water is 47.8MPa after 28 days; the plastic expanding agent is a yellow powdery plastic expanding agent purchased from open building materials Co., Ltd, Xian,the water content is 0.2 percent, and the free expansion rate is 0.7 percent after 3 hours; the silica fume is purchased from Chongqing silicon micro-structure building materials GmbH for concrete, the water content is 1.7%, the specific surface area is 19900m²/kg, 7d activity index 110%; the fly ash is F class II fly ash of an outsourcing Chongqing Lopa Huang Dynasty power plant, the fineness is 6.8 percent (0.045mm screen residue), the water content is 0.2 percent, and the strength activity index is 75 percent; the ultrafine stone powder is self-made, limestone is taken and mixed with gypsum and grinding aid, and the mixture is ground until the specific surface area is 1000-²The ultrafine stone powder is obtained, wherein the addition amount of the gypsum is 0.3-0.5 percent of the addition amount of the gypsum, the grinding aid is a mixture of calcium lignosulfonate and silica fume, 6 parts of calcium lignosulfonate and 94 parts of silica fume are added, the addition amount of the grinding aid is 0.3-0.5 percent, and the specific surface area of the home-made ultrafine stone powder is 1340m²Per kg, water content 0.3%, calcium carbonate content 87%, 28d compressive strength ratio 75%.

Example 1

The grouting agent comprises the following components in parts by weight: 3 parts of a polycarboxylic acid water reducing agent; 0.3 part of defoaming agent; 0.2 part of anti-settling water-retaining agent; 35 parts of a concrete expanding agent; 0.4 part of plastic expanding agent; 50 parts of silica fume; 10 parts of superfine stone powder; 1.1 parts of fly ash.

The materials are added into mixing equipment to be uniformly mixed, and the pressing agent is obtained after homogenization treatment.

The addition amount of the grouting agent for preparing the grouting material is 10 percent, the portland cement selected in the test is 42.5-grade ordinary portland cement, the test is carried out according to the standard TB/T3192-:

example 2

The grouting agent comprises the following components in parts by weight: 4 parts of a polycarboxylic acid water reducing agent; 0.4 part of defoaming agent; 0.3 part of anti-settling water-retaining agent; 35 parts of a concrete expanding agent; 0.4 part of plastic expanding agent; 47 parts of silica fume; 10 parts of superfine stone powder; 2.9 parts of fly ash.

The materials are added into mixing equipment to be uniformly mixed, and the pressing agent is obtained after homogenization treatment.

The addition amount of the grouting agent for preparing the grouting material is 10 percent, the portland cement selected in the test is 42.5-grade ordinary portland cement, the test is carried out according to the standard TB/T3192-:

therefore, the product of the invention meets the industrial standard.