Geopolymer cement grout and method of making

Abstract

The present application relates to a kind of geopolymer cement grout, including glass water, kaolin, expanding agent, quicklime powder, re-dispersible latex powder, standard sand;Each component is proportioned as follows by weight fraction ratio: 100 weight parts of water glass, 40~52 weight parts of kaolin, 4~5 weight parts of expanding agent, 2~4 weight parts of quicklime powder, 0.5~1.5 weight parts of re-dispersible latex powder, 35~40 weight parts of standard sand.The geopolymer cement grout is applied to sleeve grouting, caulking and the like.The high-strength non-shrinkage geopolymer cement grout provided by the present application is simple to deploy, low in cost, low in production energy consumption, small in carbon emissions, has good flow performance, mechanical properties and micro-expansion performance, and can meet the various requirements of industry specifications for grout.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of structure and building, in particular to a geopolymer cement grout and a preparation method thereof. BACKGROUND

[0002] In recent years, the state has vigorously promoted the industrialization of construction, and the prefabricated component assembly type installation as part of the industrialization of construction has also been more and more widely applied, which has the advantages of fast construction speed, high labor efficiency, good building quality and compliance with green development. The sleeve grouting technology is the key to the connection of prefabricated components, which uses the grouting sleeve as the connection method to make up for the shortcomings of the traditional connection method, and has the advantages of excellent performance, low self-weight, low cost and convenient construction. The performance of the sleeve grouting material plays a crucial role in ensuring the safety of the sleeve connection technology.

[0003] As one of the key technical links of the assembly type building construction, the industry standard "Sleeve Grouting Material for Reinforcement Connection" (JG / T408-2013) is formulated for the sleeve grouting material in China, which requires that the sleeve grouting material not only has high compressive strength and appropriate expansion rate, but also has good construction performance and long operable time.

[0004] Due to the high performance requirements of the industry standard for the grouting material in various aspects, a large amount of admixtures and additives need to be added to the traditional Portland cement to meet these requirements, which leads to higher requirements for the traditional Portland cement grouting material on the mixing process and higher cost. In addition, the production of traditional Portland cement has high energy consumption and emits a large amount of carbon dioxide. Compared with traditional Portland cement, geopolymer cement is a controllable inorganic cementitious material, and its mechanical properties, workability and durability can be improved by adjusting the formula. At the same time, the production of geopolymer cement has the advantages of low energy consumption and small carbon emission, so the promotion of the application formula of geopolymer cement is conducive to the realization of the carbon peak and carbon neutralization goals of the country. However, the research on geopolymer cement started late, and its preparation process is still in the stage of improvement. Further, it is an urgent problem to develop and prepare geopolymer cement grouting material for the sleeve grouting of prefabricated components of assembly type building to replace traditional Portland cement grouting material. SUMMARY

[0005] In view of the above problems of the prior art, the purpose of the present application is to provide a geopolymer cement and a geopolymer cement grouting material with simple formula and low cost, and the preparation method of the geopolymer cement grouting material is simple and convenient to use.

[0006] To solve the above technical problems, the technical scheme adopted by the present application is:

[0007] A geopolymer cement grout, the geopolymer cement grout comprising geopolymer cement and standard sand, the geopolymer cement comprising geopolymer cement dry powder and water glass; the geopolymer cement dry powder comprising kaolin, expanding agent, quicklime powder and redispersible latex powder.

[0008] Further, the geopolymer cement comprises the following components by mass fraction:

[0009] Water glass 100 parts by weight

[0010] Kaolin 40-52 parts by weight

[0011] Expanding agent 4-5 parts by weight

[0012] Quicklime powder 2-4 parts by weight

[0013] Redispersible latex powder 0.5-1.5 parts by weight.

[0014] Further, the geopolymer cement grout comprises geopolymer cement 146.5-162.5 parts by weight, and standard sand 35-40 parts by weight. The standard sand and the geopolymer cement dry powder, i.e. kaolin, expanding agent, quicklime powder, and redispersible latex powder, together constitute the grout dry powder.

[0015] The geopolymer cement grout is prepared by the following method: uniformly premixing the geopolymer cement dry powder and the continuously graded standard sand in proportion, adding water glass in the proportion, stirring uniformly, and then standing and cooling to prepare the geopolymer cement grout.

[0016] The application also provides a preparation method of the geopolymer cement grout, comprising the following steps:

[0017] Step one: uniformly premixing the geopolymer cement dry powder and the continuously graded standard sand in proportion to obtain the grout dry powder;

[0018] Step two: adding water glass to the grout dry powder of step one in proportion; stirring for 5 minutes, stirring uniformly, and then standing for 15 minutes until the temperature of the grout is reduced to below 30℃ to prepare the geopolymer cement grout.

[0019] Specifically, the water glass is an aqueous solution of one or both of Na2O·nSiO2 and K2O·nSiO2, wherein n is the modulus, the modulus of the water glass is 1.4, and the mass concentration of the water glass is 24.2-30.9%. If the water glass meeting the modulus requirement cannot be directly purchased, the corresponding NaOH and KOH can be added to adjust the modulus. As an alkali activator, the silicon-oxygen bond and aluminum-oxygen bond in the raw material kaolin are broken under the action of the water glass and then recombined, which is the essential reaction process of the geopolymer cement.

[0020] Specifically, the kaolin contains Al2O3 and SiO2, preferably, Al2O3 / SiO2 is greater than or equal to 0.8 in terms of weight. The main component of kaolin is Al2O3·2SiO2·2H2O, which is a natural high-silicon aluminum material and is rich in resources. The performance of geopolymer depends on the dissolution amount of Si, Al and other elements in the raw material. The higher the dissolution amount of Si, Al and other elements, the more three-dimensional network gel composed of [SiO4] 4- and [AlO4] 5- is produced, and the better the mechanical performance of geopolymer cement.

[0021] Specifically, the expanding agent includes a calcium sulphoaluminate expanding agent.

[0022] Preferably, the content of CaO in the quicklime powder is not less than 90% in terms of weight.

[0023] Further, the ratio of the expanding agent to the quicklime powder is 1.5-2.5:1 in terms of mass, preferably 1.8-2.2:1. Quicklime reacts with water to produce calcium hydroxide at a relatively fast speed, providing expansion in the early stage of hydration. The main component of the calcium sulphoaluminate expanding agent is CaO, Al2O3 and CaSO4, which reacts with water to generate calcium sulphoaluminate hydrate crystals, providing micro-expansion in the late stage of hydration to resist shrinkage. The two components play a synergistic role in the volume expansion of geopolymer cement grouting material.

[0024] Specifically, the redispersible latex powder includes vinyl acetate and ethylene copolymer powder, ethylene, vinyl chloride and vinyl silicate terpolymer powder, vinyl acetate, ethylene and high fatty acid ethylene terpolymer powder, etc. The redispersible latex powder is dispersed in water, and after the evaporation of water, a polymer film is formed in the dried grouting material, which can improve the performance of the grouting material, making it have better bonding strength, cohesion, bending strength, wear resistance and construction performance.

[0025] Specifically, the standard sand is standard sand, preferably continuous gradation standard sand with a particle size of 0.25-0.5 mm.

[0026] The application also provides the application of the geopolymer cement grouting material in the sleeve grouting of prefabricated building prefabricated components, road or airport joint filling.

[0027] By adopting the above technical solution, the geopolymer cement and the geopolymer cement grouting material provided by the application have the following beneficial effects:

[0028] The grouting material is mixed by cement, admixture, aggregate, mineral admixture and other materials, and needs to have good working performance such as high fluidity, no segregation, slight expansion and the like, and performance characteristics such as fast hardening, early strength and high strength. In order to meet these performances, the traditional Portland cement grouting material often needs to add multiple admixtures, which not only has high cost, but also complex proportioning can lead to that the formula stability is easily affected by multiple factors. Compared with the traditional Portland cement grouting material, the geopolymer cement grouting material provided by the present application has simple formula, low cost, can meet various performance requirements of the grouting material in the industry standard, and the production of the geopolymer cement has the advantages of low production energy consumption and small carbon emission, and 1m 3 The CO2 emission of the geopolymer cement is only 1m 3 9% of the traditional Portland cement, so the popularization of the application formula of the geopolymer cement is conducive to the realization of the carbon peak and carbon neutralization targets of the country.

[0029] The geopolymer cement grouting material provided by the present application is configured by a high-strength cementitious material, an expansion component, an optimally graded aggregate component and a trace modification component in a proper proportion. The geopolymer cement grouting material has an initial fluidity value of greater than or equal to 380 mm, a fluidity 30 min retention value of greater than or equal to 250 mm, a 1d compressive strength of greater than or equal to 50 Mpa, a 3d compressive strength of greater than or equal to 80 Mpa, a 28d compressive strength of greater than or equal to 100 Mpa, a 3h vertical expansion rate of greater than or equal to 0.09%, a difference between the 24h vertical expansion rate and the 3h vertical expansion rate in the range of 0.04-0.05%, and a water absorption rate of 0. The geopolymer cement grouting material has no rusting effect on steel bars. In summary, the various performances of the geopolymer cement grouting material meet and are superior to the standard values of the industry standard. In the formula, the addition of the redispersible latex powder makes the texture of the grouting material uniform, the consistency appropriate, and the high fluidity and long operable time of the grouting material ensured. The proportioning of the calcium sulphoaluminate expansive agent and the lime powder in the formula plays a decisive role in the slight expansion performance of the grouting material. The lime reacts with water to produce calcium hydroxide at a relatively fast speed, and provides expansion in the early hydration stage. The main component of the calcium sulphoaluminate expansive agent is CaO, Al2O3 and CaSO4, which reacts with water to generate calcium sulphoaluminate hydrate crystals, and provides slight expansion and shrinkage resistance in the late hydration stage. The two components have a synergistic effect on the volume expansion of the geopolymer cement grouting material.

[0030] The application adopts pre-produced geopolymer cement grouting material dry powder which can be used for assembling building sleeve grouting, namely kaolin, expanding agent, quicklime, redispersible emulsion powder and continuous gradation standard sand, so that the geopolymer cement grouting material dry powder can be pre-weighed and mixed in the factory, and only water glass needs to be added and stirred on site, so that the high-strength non-shrinkage grouting material with uniformity, appropriate consistency and high fluidity can be obtained, and the stable performance and reliable quality of the geopolymer cement grouting material are ensured. DETAILED DESCRIPTION

[0031] The advantages and effects of the application can be easily understood by those skilled in the art from the disclosure of the specification. The application can also be implemented or applied by different specific embodiments, and various modifications or changes can be made based on different views and applications without departing from the spirit of the application. It should be noted that the following examples and features in the examples can be combined with each other without conflict.

[0032] The application provides a geopolymer cement grouting material, which comprises geopolymer cement and standard sand, the geopolymer cement comprises geopolymer cement dry powder and water glass, and the geopolymer cement dry powder comprises kaolin, expanding agent, quicklime powder and redispersible emulsion powder.

[0033] Further, the geopolymer cement comprises the following components by mass fraction:

[0034] Water glass 100 parts by weight

[0035] Kaolin 40-52 parts by weight

[0036] Expanding agent 4-5 parts by weight

[0037] Quicklime powder 2-4 parts by weight

[0038] Redispersible emulsion powder 0.5-1.5 parts by weight.

[0039] Further, the geopolymer cement grouting material comprises geopolymer cement 146.5-162.5 parts by weight and standard sand 35-40 parts by weight. The standard sand and the geopolymer cement dry powder, namely kaolin, expanding agent, quicklime powder and redispersible emulsion powder, jointly constitute the grouting material dry powder.

[0040] The application also provides a preparation method of the geopolymer cement grouting material, which comprises the following steps:

[0041] Step one: uniformly premixing geopolymer cement dry powder and continuous gradation standard sand according to the proportion to obtain grouting material dry powder;

[0042] Step two: add water glass to the dry grouting material in step one in proportion; stir for 5 minutes, and after stirring evenly, stand for 15 minutes, and when the temperature of the slurry is reduced to below 30℃, prepare the geopolymer cement grouting material.

[0043] Specifically, the water glass is an aqueous solution of one or both of Na2O·nSiO2 and K2O·nSiO2, wherein n is the modulus, the modulus of the water glass is 1.4, and the mass concentration of the water glass is 24.2-30.9%. If the water glass with the required modulus cannot be directly purchased, the corresponding NaOH and KOH can be added to adjust the modulus.

[0044] Specifically, the kaolin contains Al2O3 and SiO2, and preferably, the content of Al2O3 / SiO2 is greater than or equal to 0.8 by weight parts. The raw materials used in the examples are commercially available.

[0045] Specifically, the expanding agent includes calcium sulphoaluminate.

[0046] Preferably, the content of CaO in the quicklime powder is not less than 90% by weight parts. The raw materials used in the examples are commercially available.

[0047] Further, the ratio of the expanding agent to the quicklime powder is 1.5-2.5:1 by mass parts, and preferably 1.8-2.2:1.

[0048] Specifically, the redispersible latex powder includes vinyl acetate and ethylene copolymer powder, ethylene and vinyl chloride and vinyl silicate terpolymer powder, vinyl acetate and ethylene and higher fatty acid vinyl ester terpolymer powder, etc.

[0049] Specifically, the standard sand is standard sand, and preferably continuous gradation standard sand with a particle size of 0.25-0.5 mm.

[0050] The geopolymer cement grouting material is applied to sleeve grouting of prefabricated building components, road or airport joint filling, isolation and storage of chemical or radiation waste in the form of salt in a cavity, sealing of connecting rods, production of semi-rigid floors, construction of oil wells, etc.

[0051] The application will be further described below with reference to examples.

[0052] Example 1:

[0053] This example provides a geopolymer cement grouting material and a preparation method thereof. The weight ratio of the components of the geopolymer cement grouting material is as follows:

[0054] 100 weight parts of 24.2% sodium water glass with a modulus of 1.4

[0055] Kaolin (Al2O3 / SiO2≥0.8) 50 parts by weight

[0056] Calcium Sulfoaluminate Expansive Agent 5 parts by weight

[0057] Quicklime Powder (CaO≥90%) 2 parts by weight

[0058] Vinyl Acetate and Ethylene Copolymer Powder 1 part by weight

[0059] 0.25-0.5mm particle size continuously graded standard sand 38 parts by weight.

[0060] First, the dry grouting material, i.e. kaolin, calcium sulfoaluminate expansive agent, quicklime powder, vinyl acetate and ethylene copolymer powder, and 0.25-0.5mm particle size continuously graded standard sand, are uniformly premixed according to the proportions, poured into a plastic bucket, sodium water glass is added according to the proportions, and a hand-held stirrer with a rotation speed of 13000 rpm is used to stir for 5 minutes, and then the slurry is left to stand for 15 minutes until the temperature is reduced to below 30 degrees, and the geopolymer cement grouting material is obtained.

[0061] Example 2

[0062] The present embodiment provides a geopolymer cement grouting material and a preparation method thereof. The weight ratio of each component of the geopolymer cement grouting material is:

[0063] 25% sodium water glass with a modulus of 1.4 100 parts by weight

[0064] Kaolin (Al2O3 / SiO2≥0.8) 50 parts by weight

[0065] Calcium Sulfoaluminate Expansive Agent 4 parts by weight

[0066] Quicklime Powder (CaO≥90%) 2.5 parts by weight

[0067] Vinyl Acetate and Ethylene Copolymer Powder 1 part by weight

[0068] 0.25-0.5mm particle size continuously graded standard sand 40 parts by weight.

[0069] First, the dry grouting material, i.e. kaolin, calcium sulfoaluminate expansive agent, quicklime powder, vinyl acetate and ethylene copolymer powder, and 0.25-0.5mm particle size continuously graded standard sand, are uniformly premixed according to the proportions, poured into a plastic bucket, sodium water glass is added according to the proportions, and a hand-held stirrer with a rotation speed of 13000 rpm is used to stir for 5 minutes, and then the slurry is left to stand for 15 minutes until the temperature is reduced to below 30 degrees, and the geopolymer cement grouting material is obtained.

[0070] Example 3

[0071] The embodiment provides a geopolymer cement grouting material and a preparation method thereof. The geopolymer cement grouting material has a component ratio as follows:

[0072] 30% sodium water glass with a modulus of 1.4 100 parts by weight

[0073] Kaolin (Al2O3 / SiO2≥0.8) 50 parts by weight

[0074] Calcium sulphoaluminate expansive agent 4.5 parts by weight

[0075] Quicklime powder (CaO≥90%) 2.2 parts by weight

[0076] Vinyl acetate and ethylene copolymer glue powder 1.2 parts by weight

[0077] Standard sand with a continuous gradation of 0.25-0.5 mm particle size 37 parts by weight.

[0078] First, the grouting material dry powder, namely, the kaolin, the calcium sulphoaluminate expansive agent, the quicklime powder, the vinyl acetate and ethylene copolymer glue powder and the standard sand with a continuous gradation of 0.25-0.5 mm particle size, are uniformly premixed according to the proportion, poured into a plastic bucket, the water glass is added according to the proportion, a hand-held stirrer with a rotating speed of 13000 rpm is used to stir for 5 minutes, and the grouting material is left to stand for 15 minutes until the temperature is reduced to below 30 degrees, so that the geopolymer cement grouting material is prepared.

[0079] Example 4

[0080] The embodiment provides a geopolymer cement grouting material and a preparation method thereof. The geopolymer cement grouting material of the embodiment is different from that of example 1 only in that 24.2% potassium water glass with a modulus of 1.4 is used to replace 24.2% sodium water glass with a modulus of 1.4. The preparation method of the geopolymer cement grouting material of the embodiment is the same as that of example 1.

[0081] Comparative Example 1

[0082] The geopolymer cement grouting material is different from that of example 1 only in that the quicklime powder is not contained in the component, and the preparation method is the same as that of example 1.

[0083] Comparative Example 2

[0084] The geopolymer cement grouting material is different from that of example 1 only in that the expansive agent is not contained, and the preparation method is the same as that of example 1.

[0085] Comparative Example 3

[0086] The ratio of the geopolymer cement grouting material is only different from that of Example 1 in that 24.2% sodium water glass with a modulus of 1.5 is used to replace 24.2% sodium water glass with a modulus of 1.4, and the preparation method is the same as that of Example 1. After the addition of 24.2% sodium water glass with a modulus of 1.5, the geopolymer cement grouting material quickly solidifies and cannot be used.

[0087] Compared with the prior art, the geopolymer cement grouting material prepared in Examples 1-4 has better flow performance and mechanical properties, meets the requirements of the industry standard for the slight expansion of sleeve grouting material, and is convenient to construct and stable in performance. The performance indicators of the geopolymer cement grouting material obtained in Examples 1-3 and Comparative Examples 1-2 are tested according to the Sleeve Grouting Material for Reinforcement Connection (JG / T 408-2013), and the results are shown in Table 1.

[0088] As can be seen from the test results in Table 1, the geopolymer cement grouting materials prepared in Examples 1-3 and Comparative Examples 1-2 all have good flow performance and mechanical properties. However, compared with Examples 1-3, the geopolymer cement grouting materials prepared in Comparative Examples 1-2 cannot meet the requirements of the industry standard for the slight expansion and non-shrinkage of sleeve grouting material. The formula of Comparative Example 1 does not contain quicklime powder, and the early expansion effect is not good, but it starts to expand under the action of calcium sulphoaluminate expansion agent in the later period, so that the difference between the vertical expansion rates at 24h and 3h is large, which does not meet the industry standard. The formula of Comparative Example 2 does not contain calcium sulphoaluminate expansion agent, and it expands rapidly in the early period under the action of quicklime, but it starts to shrink in the later period, so that the difference between the vertical expansion rates at 24h and 3h is large, which does not meet the industry standard. In Examples 1-3, the reasonable proportioning of calcium sulphoaluminate expansion agent and quicklime powder plays a decisive role in the expansion and shrinkage of the geopolymer cement grouting material. Quicklime reacts with water to produce calcium hydroxide at a relatively fast speed, providing expansion in the early hydration period. The main component of calcium sulphoaluminate expansion agent is CaO, Al2O3 and CaSO4, which reacts with water to generate calcium sulphoaluminate hydrate crystals, providing slight expansion in the later hydration period and resisting shrinkage. The combined action of calcium sulphoaluminate expansion agent and quicklime powder makes the geopolymer cement grouting material have better slight expansion effect, and the shrinkage rate after 24h is lower, meeting the requirements of the industry standard for high-strength non-shrinkage grouting material.

[0089] Table 1 Performance indicators of geopolymer cement grouting material

[0090]

[0091] Although the present application has been disclosed with reference to the preferred embodiments, it is not intended to limit the present application, and any person skilled in the art can make some modifications and improvements without departing from the spirit and scope of the present application, so the protection scope of the present application shall be defined by the claims.

Claims

1. A geopolymer cement grout, characterized in that, The geopolymer cement grout comprises 146.5 to 162.5 parts by weight of geopolymer cement and 35 to 40 parts by weight of standard sand; The geopolymer cement comprises the following components in parts by weight: The ratio of the expanding agent to quicklime powder by weight is 1.5 to 2.5:1; The expanding agent is a calcium sulfoaluminate-based expanding agent; The kaolin contains Al2O3 and SiO2, with an Al2O3 / SiO2 ratio ≥ 0.8 by weight. The water glass is one of Na2O·nSiO2 and K2O·nSiO2; where n is the modulus, and the modulus of the water glass is 1.4; the mass concentration of the water glass is 24.2% to 30.9%.

2. The geopolymer cement grouting material according to claim 1, characterized in that, The geopolymer cement grout is prepared by the following method: geopolymer cement dry powder and continuously graded standard sand are premixed evenly in proportion, water glass is added in proportion, and after stirring evenly, the mixture is allowed to stand and cool down to obtain the geopolymer cement grout.

3. A method for preparing a geopolymer cement grout as described in any one of claims 1 or 2, characterized in that, Includes the following steps: Step 1: Mix the geopolymer cement dry powder and continuously graded standard sand in a certain proportion to obtain grouting material dry powder; Step 2: Add water glass to the grouting dry powder described in Step 1 in proportion; stir evenly and let stand to cool down to obtain the geopolymer cement grouting material.

4. The application of a geopolymer cement grout as described in claim 1 or 2 in sleeve grouting and joint filling.

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