阅读说明：本技术 一种可提高水泥基注浆料施工性能的外加剂及其制备方法 (Additive capable of improving construction performance of cement-based grouting material and preparation method thereof ) 是由 周坤 周崇清 雷震 于 2019-12-03 设计创作，主要内容包括：本发明公开了一种可提高水泥基注浆料施工性能的外加剂,按照质量组份计所述可提高水泥基注浆料施工性能的外加剂的配方如下：聚羧酸减水粉剂338～346份、塑性膨胀剂55～59份、温轮胶4～6份、可再分散乳胶粉565～577份、六偏磷酸钠7～11份、三聚磷酸钠5～9份、柠檬酸5～9份和葡萄糖酸钠1～3份；本发明还公开了一种可提高水泥基注浆料施工性能的外加剂的制备方法。本发明提供的一种可提高水泥基注浆料施工性能的外加剂具有较高的减水率、流变性、保水性、可控的塑性膨胀性和良好的粘接性,可有效提高水泥基注浆料的施工性能,本发明提供的一种可提高水泥基注浆料施工性能的外加剂的制备方法合理,可控性强,制备时间短,易于工业化生产。(The invention discloses an additive capable of improving the construction performance of a cement-based grouting material, which comprises the following components in parts by mass: 338-346 parts of polycarboxylic acid water-reducing powder, 55-59 parts of plastic expanding agent, 4-6 parts of welan gum, 565-577 parts of redispersible latex powder, 7-11 parts of sodium hexametaphosphate, 5-9 parts of sodium tripolyphosphate, 5-9 parts of citric acid and 1-3 parts of sodium gluconate; the invention also discloses a preparation method of the additive capable of improving the construction performance of the cement-based grouting material. The additive capable of improving the construction performance of the cement-based grouting material provided by the invention has higher water reducing rate, rheological property, water retention property, controllable plastic expansibility and good adhesion, and can effectively improve the construction performance of the cement-based grouting material.)

1. The additive capable of improving the construction performance of the cement-based grouting material is characterized by comprising the following components in parts by mass:

338-346 parts of polycarboxylic acid water-reducing powder, 55-59 parts of plastic expanding agent, 4-6 parts of welan gum, 565-577 parts of redispersible latex powder, 7-11 parts of sodium hexametaphosphate, 5-9 parts of sodium tripolyphosphate, 5-9 parts of citric acid and 1-3 parts of sodium gluconate.

2. The admixture for improving workability of cement-based grouting material according to claim 1, wherein: the polycarboxylic acid water reducing powder, the plastic expanding agent, the rubber cement, the re-dispersible latex powder, the sodium hexametaphosphate, the sodium tripolyphosphate, the citric acid and the sodium gluconate are all powder materials with the grain size not larger than 50 meshes.

3. The admixture for improving workability of cement-based grouting material according to claim 1, wherein: the water content of the polycarboxylic acid water-reducing powder is less than 5%.

4. The admixture for improving workability of cement-based grouting material according to claim 1, wherein: the plastic expanding agent is one or more of organic hydrocarbon compounds, calcium sulphoaluminate compounds and calcium oxide compounds.

5. The admixture for improving workability of cement-based grouting material according to claim 1, wherein: the redispersible latex powder is vinyl acetate-ethylene copolymer rubber powder.

6. The admixture for improving workability of cement-based grouting material according to claim 1, wherein: the additive capable of improving the construction performance of the cement-based grouting material is added in an amount which is 0.8 to 1.2 percent of the amount of the cementing material in the cement-based grouting material in percentage by weight.

7. A method for preparing the admixture for improving workability of cement-based grouting material according to claim 1, comprising the steps of:

s1, weighing the polycarboxylic acid water-reducing powder, the plastic expanding agent, the welan gum, the redispersible latex powder, the sodium hexametaphosphate, the sodium tripolyphosphate, the citric acid and the sodium gluconate according to a proper mass ratio for later use;

s2, putting the polycarboxylic acid water-reducing powder, the plastic expanding agent, the welan gum, the redispersible latex powder, the sodium hexametaphosphate, the sodium tripolyphosphate, the citric acid and the sodium gluconate weighed in the S1 into a mixing container of a resonance mixer;

s3, heating the mixing container of the resonance mixer after the materials are added in the S2, starting the resonance mixer, and starting mixing;

s4, stopping the resonance mixer after the preset first mixing time is reached;

s5, vacuumizing the mixing container of the resonance mixer, reheating the mixing container of the resonance mixer, starting the resonance mixer again, and continuously mixing for a preset second mixing time;

s6, vacuumizing a mixing container of the resonance mixer, recovering to normal atmospheric pressure, and stopping the resonance mixer to obtain a mixed material;

and S7, after the mixture in the S6 is naturally cooled, sieving the mixture in a mixing container of the resonance mixer to obtain the admixture capable of improving the workability of the cement-based grouting material.

8. The method for preparing the additive capable of improving the workability of the cement-based grouting material according to claim 7, wherein the additive comprises the following components in percentage by weight: the heating temperature of the mixing container of the resonance mixer in the S3 is 25-75 ℃, the resonance acceleration is 20-50 g, the heating temperature of the mixing container of the resonance mixer in the S5 is 30-50 ℃, the resonance acceleration is 40-70 g, and the vacuum degree is 5-30 KPa.

9. The method for preparing the additive capable of improving the workability of the cement-based grouting material according to claim 7, wherein the additive comprises the following components in percentage by weight: the preset first mixing time in the step S4 is 15-45 min, and the preset second mixing time in the step S5 is 30-75 min.

10. The method for preparing the additive capable of improving the workability of the cement-based grouting material according to claim 7, wherein the additive comprises the following components in percentage by weight: the mesh number of the sieving screen in the S7 is 50-200 meshes.

Technical Field

The invention relates to the technical field of vault grouting in tunnel engineering, in particular to an additive capable of improving the construction performance of cement-based grouting material, and simultaneously relates to a preparation method of the additive capable of improving the construction performance of the cement-based grouting material.

Background

At present, commonly used grouting materials mainly comprise chemical grouting materials and cement grouting materials, and compared with the chemical grouting materials, the cement grouting materials have the advantages of wide raw material source, low price, no toxicity, corrosion resistance, high stone strength, good durability and the like, so that the cement grouting materials are widely applied to the field of various grouting projects.

The traditional cement-based grouting material adopts cement paste with high water-to-cement ratio, and does not incorporate additives capable of improving the construction performance of the paste, so that the grouting material has poor volume stability, low strength and poor bonding effect with concrete, and the lining structure after grouting has poor integrity.

Disclosure of Invention

The invention aims to provide an additive capable of improving the construction performance of cement-based grouting material and a preparation method thereof, which have higher water reducing rate, rheological property, water retention property, controllable plastic expansibility and good adhesion property, can effectively improve the construction performance of the cement-based grouting material, and have the advantages of reasonable method, strong controllability, short preparation time and easy industrial production, thereby solving the problems in the background technology.

In order to achieve the purpose, the invention provides the following technical scheme:

the admixture capable of improving the construction performance of the cement-based grouting material comprises the following components in parts by mass:

338-346 parts of polycarboxylic acid water-reducing powder, 55-59 parts of plastic expanding agent, 4-6 parts of welan gum, 565-577 parts of redispersible latex powder, 7-11 parts of sodium hexametaphosphate, 5-9 parts of sodium tripolyphosphate, 5-9 parts of citric acid and 1-3 parts of sodium gluconate.

Preferably, the polycarboxylic acid water-reducing powder, the plastic expanding agent, the rubber, the re-dispersible latex powder, the sodium hexametaphosphate, the sodium tripolyphosphate, the citric acid and the sodium gluconate are all powder materials with the particle size not larger than 50 meshes.

Preferably, the water content of the polycarboxylic acid water-reducing powder is 5% or less.

Preferably, the plastic expanding agent is one or more of organic hydrocarbon compounds, calcium sulphoaluminates and calcium oxides.

Preferably, the redispersible latex powder is vinyl acetate-ethylene copolymer rubber powder.

Preferably, the additive capable of improving the workability of the cement-based grouting material is added in an amount of 0.8 to 1.2 percent of the amount of the cementing material in the cement-based grouting material in terms of weight ratio.

The invention also provides a preparation method of the additive capable of improving the construction performance of the cement-based grouting material, which comprises the following steps:

s1, weighing the polycarboxylic acid water-reducing powder, the plastic expanding agent, the welan gum, the redispersible latex powder, the sodium hexametaphosphate, the sodium tripolyphosphate, the citric acid and the sodium gluconate according to a proper mass ratio for later use;

s2, putting the polycarboxylic acid water-reducing powder, the plastic expanding agent, the welan gum, the redispersible latex powder, the sodium hexametaphosphate, the sodium tripolyphosphate, the citric acid and the sodium gluconate weighed in the S1 into a mixing container of a resonance mixer;

s3, heating the mixing container of the resonance mixer after the materials are added in the S2, starting the resonance mixer, and starting mixing;

s4, stopping the resonance mixer after the preset first mixing time is reached;

s5, vacuumizing the mixing container of the resonance mixer, reheating the mixing container of the resonance mixer, starting the resonance mixer again, and continuously mixing for a preset second mixing time;

s6, vacuumizing a mixing container of the resonance mixer, recovering to normal atmospheric pressure, and stopping the resonance mixer to obtain a mixed material;

and S7, after the mixture in the S6 is naturally cooled, sieving the mixture in a mixing container of the resonance mixer to obtain the admixture capable of improving the workability of the cement-based grouting material.

Preferably, the heating temperature of the mixing container of the resonance mixer in the S3 is 25-75 ℃, the resonance acceleration is 20-50 g, the heating temperature of the mixing container of the resonance mixer in the S5 is 30-50 ℃, the resonance acceleration is 40-70 g, and the vacuum degree is 5-30 KPa.

Preferably, the preset first mixing time in the step S4 is 15-45 min, and the preset second mixing time in the step S5 is 30-75 min.

Preferably, the mesh number of the screening mesh in the S7 is 50-200 meshes.

Compared with the prior art, the invention has the beneficial effects that: the additive capable of improving the construction performance of the cement-based grouting material provided by the invention has reasonable component proportion, scientific raw material configuration of each component, mutual cooperation of the functions, higher water reducing rate by utilizing the water reducing function of a polycarboxylic acid water reducing agent, the micro-expansion characteristic of a plastic expanding agent, the pseudoplastic fluid characteristic of a welan gum, the film forming characteristic of a re-dispersible latex powder and the dispersion and retardation characteristics of materials such as sodium hexametaphosphate, sodium tripolyphosphate, citric acid, sodium gluconate and the like, can obviously reduce the water consumption of the grouting material, improve the strength, have good rheological property, can obviously improve the flow property of the grouting material, is easy to construct, has good water retention property, ensures that the grouting material does not delaminate and bleed after pressure pumping, has controllable plastic expansion property, can obviously improve the volume stability and uniformity of the grouting material, ensures that the grouting is full and compact, and has good adhesion, the additive capable of improving the construction performance of the cement-based grouting material provided by the invention has the advantages of reasonable preparation method, strong controllability, short preparation time and easiness in industrial production.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.