CN113998948A - Geopolymer-containing cement slurry-based grouting material suitable for high-ground-temperature environment and preparation method thereof - Google Patents
Geopolymer-containing cement slurry-based grouting material suitable for high-ground-temperature environment and preparation method thereof Download PDFInfo
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- CN113998948A CN113998948A CN202111318351.3A CN202111318351A CN113998948A CN 113998948 A CN113998948 A CN 113998948A CN 202111318351 A CN202111318351 A CN 202111318351A CN 113998948 A CN113998948 A CN 113998948A
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- 239000002002 slurry Substances 0.000 title claims abstract description 60
- 239000000463 material Substances 0.000 title claims abstract description 41
- 239000004568 cement Substances 0.000 title claims abstract description 33
- 229920000876 geopolymer Polymers 0.000 title claims abstract description 17
- 238000002360 preparation method Methods 0.000 title claims description 6
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims abstract description 75
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 46
- 239000011398 Portland cement Substances 0.000 claims abstract description 34
- 239000002994 raw material Substances 0.000 claims abstract description 19
- 239000011343 solid material Substances 0.000 claims abstract description 11
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 claims description 45
- 238000003756 stirring Methods 0.000 claims description 38
- 230000000694 effects Effects 0.000 claims description 9
- 238000002156 mixing Methods 0.000 claims description 6
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 5
- 229920003041 geopolymer cement Polymers 0.000 claims description 4
- 239000011413 geopolymer cement Substances 0.000 claims description 4
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 3
- 229910052681 coesite Inorganic materials 0.000 claims description 3
- 229910052593 corundum Inorganic materials 0.000 claims description 3
- 229910052906 cristobalite Inorganic materials 0.000 claims description 3
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims description 3
- 239000000377 silicon dioxide Substances 0.000 claims description 3
- 229910052682 stishovite Inorganic materials 0.000 claims description 3
- 229910052905 tridymite Inorganic materials 0.000 claims description 3
- 229910001845 yogo sapphire Inorganic materials 0.000 claims description 3
- 235000012239 silicon dioxide Nutrition 0.000 claims description 2
- 239000008399 tap water Substances 0.000 claims description 2
- 235000020679 tap water Nutrition 0.000 claims description 2
- 230000006378 damage Effects 0.000 abstract description 3
- 238000003912 environmental pollution Methods 0.000 abstract description 3
- 239000000654 additive Substances 0.000 abstract description 2
- 230000000996 additive effect Effects 0.000 abstract description 2
- 238000012360 testing method Methods 0.000 description 22
- 238000006703 hydration reaction Methods 0.000 description 11
- 230000036571 hydration Effects 0.000 description 10
- 229910000831 Steel Inorganic materials 0.000 description 9
- 239000010959 steel Substances 0.000 description 9
- 230000002829 reductive effect Effects 0.000 description 7
- 229910052782 aluminium Inorganic materials 0.000 description 5
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 5
- 239000004575 stone Substances 0.000 description 5
- 239000003513 alkali Substances 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 4
- 238000010276 construction Methods 0.000 description 4
- 238000005065 mining Methods 0.000 description 4
- 230000001681 protective effect Effects 0.000 description 4
- 210000004911 serous fluid Anatomy 0.000 description 4
- 239000011575 calcium Substances 0.000 description 3
- 238000005345 coagulation Methods 0.000 description 3
- 230000015271 coagulation Effects 0.000 description 3
- 230000003247 decreasing effect Effects 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- 239000003755 preservative agent Substances 0.000 description 3
- 230000002335 preservative effect Effects 0.000 description 3
- 238000000926 separation method Methods 0.000 description 3
- 239000003469 silicate cement Substances 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 229910002808 Si–O–Si Inorganic materials 0.000 description 2
- OBNDGIHQAIXEAO-UHFFFAOYSA-N [O].[Si] Chemical compound [O].[Si] OBNDGIHQAIXEAO-UHFFFAOYSA-N 0.000 description 2
- 239000012190 activator Substances 0.000 description 2
- 239000003674 animal food additive Substances 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 229910001387 inorganic aluminate Inorganic materials 0.000 description 2
- 229910052909 inorganic silicate Inorganic materials 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000011268 mixed slurry Substances 0.000 description 2
- 239000000178 monomer Substances 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 230000001988 toxicity Effects 0.000 description 2
- 231100000419 toxicity Toxicity 0.000 description 2
- 238000005303 weighing Methods 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 1
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 1
- 229910019142 PO4 Inorganic materials 0.000 description 1
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000740 bleeding effect Effects 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 239000011083 cement mortar Substances 0.000 description 1
- 239000013043 chemical agent Substances 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 238000009440 infrastructure construction Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000011259 mixed solution Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 230000036961 partial effect Effects 0.000 description 1
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 1
- 239000010452 phosphate Substances 0.000 description 1
- 229910052700 potassium Inorganic materials 0.000 description 1
- 239000011591 potassium Substances 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 239000008213 purified water Substances 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 238000001612 separation test Methods 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B12/00—Cements not provided for in groups C04B7/00 - C04B11/00
- C04B12/005—Geopolymer cements, e.g. reaction products of aluminosilicates with alkali metal hydroxides or silicates
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/70—Grouts, e.g. injection mixtures for cables for prestressed concrete
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses a geopolymer-containing cement slurry-based grouting material suitable for a high ground temperature environment, which is prepared from the following raw materials in parts by weight: 100 parts of solid material, 0.12 part of sodium hydroxide and water; wherein the weight parts of water meet the following requirements: the water-cement ratio is 1:1, and the ash is the weight part of solid materials; the water-to-ash ratio is expressed as the ratio of parts by weight of water to parts by weight of ash. The grouting material is prepared from the conventional portland cement without adding any additive, is suitable for high-ground-temperature environments, solves the problems of reducing ecological damage and environmental pollution, and can meet the requirements of wide raw material sources and cost reduction.
Description
Technical Field
The invention belongs to the technical field of geotechnical engineering and civil engineering and particularly relates to a geopolymer-containing cement slurry-based grouting material suitable for a high ground temperature environment and a preparation method thereof.
Background
With the rapid advance of infrastructure construction, the geological environment that tunnel engineering faces is more and more complicated, and the high ground temperature problem is comparatively outstanding. The high ground temperature can worsen the construction working environment, has a difference with the normal temperature rock and soil body construction in the selection of grouting materials, and has great influence on the mechanical property and durability of the grouting concretion body.
In addition, the chemical slurry adopted at present has the problems of toxicity and harm, and the large slurry consumption in the actual engineering causes high cost, large raw material consumption and prominent environmental problems, so that the chemical slurry cannot be coordinated with green mining and green construction.
Disclosure of Invention
The invention aims to provide a geopolymer-containing cement slurry-based grouting material suitable for a high ground temperature environment, which is prepared from conventional portland cement without adding any additive, is suitable for the high ground temperature environment, solves the problems of ecological damage and environmental pollution, and can meet the requirements of wide raw material sources and cost reduction.
The invention adopts the following technical scheme: a geopolymer-containing cement slurry-based grouting material suitable for a high ground temperature environment is prepared from the following raw materials in parts by weight: 100 parts of solid material, 0.12 part of sodium hydroxide and water; wherein the weight parts of water meet the following requirements: the water-cement ratio is 1:1, and the ash is the weight part of solid materials; the water-to-ash ratio is expressed as the ratio of parts by weight of water to parts by weight of ash.
The solid material comprises the following raw materials in parts by weight: 88-96 parts of ordinary portland cement and 4-12 parts of metakaolin.
Further, the feed additive is prepared from the following raw materials in parts by weight: 92 parts of ordinary portland cement, 8 parts of high-activity metakaolin, 0.12 part of sodium hydroxide and 100 parts of water.
Further, the ordinary portland cement is P · O42.5 portland cement.
Furthermore, the fineness of the metakaolin is not more than that of the ordinary portland cement.
Furthermore, the metakaolin has the fineness of 1250 meshes, the activity index is more than or equal to 110, the content of SiO2 is 54.06%, the content of Al2O3 is 43.12%, the content of Fe2O3 is 0.76%, the content of CaO is 0.17%, and the content of K2O is 0.55%.
Further, the sodium hydroxide was of analytically pure AR grade.
Further, the water is tap water.
The invention also discloses a preparation method of the geopolymer-containing cement slurry-based grouting material suitable for the high ground temperature environment, which comprises the following steps of weighing the raw materials in parts by weight;
mixing ordinary portland cement and metakaolin uniformly;
dissolving sodium hydroxide in water, stirring thoroughly, standing for 12 hr, stirring again, adding ordinary portland cement and metakaolin, stirring at low speed for 5min, stopping stirring for 2min, and stirring at high speed for 5min to obtain grouting material.
The invention has the beneficial effects that: 1. the method has the advantages of low bleeding rate, high early strength, high calculus rate and small heat conductivity coefficient, and the raw materials are low in price, so that urban environmental pollution is reduced, economic cost is reduced, benefits are improved, and the problem of raw material source can be solved. 2. The silicate cement is used as the main cementing material in a mixed grouting material system, the function of the cementing agent is the key of slurry strength generation, but the water solution of the silicate cement has certain contractibility and has a direct relation with the water cement ratio, the high-activity metakaolin in the mixed solution also has the cementing function, the hydration product of the metakaolin can further react with the hydration product of the silicate cement, the cement hydration is promoted to ensure that the hydration product is rapidly precipitated and lapped, thereby the contractibility is reduced, and the excessive addition of sodium hydroxide as an alkali activator can ensure that the alkali content Ca (OH) in the cement stone2Increase and inhibit cement hydration rate, simultaneously can almost completely convert Al phase with complex coordination in the metakaolin into four coordination, convert or decompose into new aluminum tetrahedron monomer, simultaneously Si-O-Si chain in the metakaolin can also decompose and recombine, and a part of silicon-oxygen tetrahedron in the chain can be replaced by aluminum tetrahedron, thereby forming SiO4、AlO4The chain or net structure with different combination arrangement modes can achieve the purposes of improving the compressive strength of the grouting material and reducing the thermal conductivity. 3. Partial cement replacement by geopolymer metakaolinThe grouting agent is used for grouting, and other chemical agents are not added, so that the toxicity is reduced; meanwhile, the mining amount of the in-situ mine is reduced, most of secondary products of mining can be consumed, economic benefits can be obtained, the problem that the secondary products of mining occupy the land can be reduced, and the environmental superiority can be improved.
Detailed Description
The present invention will be described in detail with reference to the following embodiments.
The invention relates to a geopolymer-containing cement slurry-based grouting material suitable for a high ground temperature environment, which is characterized by being prepared from the following raw materials in parts by weight: 100 parts of solid material, 0.12 part of sodium hydroxide and water;
wherein the weight parts of water meet the following requirements: the water-cement ratio is 1:1, and the ash is the weight part of solid materials; the water-to-ash ratio is expressed as the ratio of parts by weight of water to parts by weight of ash.
The solid material comprises the following raw materials in parts by weight: 88-96 parts of ordinary portland cement and 4-12 parts of metakaolin. The ordinary portland cement is P.O 42.5 portland cement. The water is common civil purified water.
Preferably, the feed additive is prepared from the following raw materials in parts by weight: 92 parts of ordinary portland cement, 8 parts of metakaolin, 0.08 part of sodium hydroxide and 100 parts of water. Metakaolin is high activity metakaolin.
The fineness of the metakaolin is not more than that of the ordinary portland cement. Specifically, the metakaolin has a fineness of 1250 meshes, an activity index of not less than 110 and SiO254.06 percent of Al2O343.12% by mass of Fe2O30.76 percent of mass content, 0.17 percent of CaO mass content and K2The mass content of O is 0.55 percent.
Sodium hydroxide was used as analytically pure AR grade. The mass content of NaOH is more than or equal to 96 percent, the mass content of carbonate is less than or equal to 1.5 percent, and the highest content index of impurities is as follows: 0.005 percent of sulfate, 0.001 percent of phosphate, 0.002 percent of aluminum, 0.01 percent of calcium, 0.005 percent of chloride, 0.001 percent of total nitrogen, 0.01 percent of silicate, 0.05 percent of potassium, 0.01 percent of iron and 0.003 percent of heavy metal lead.
The preparation method of the geopolymer-containing cement slurry-based grouting material suitable for the high-ground-temperature environment comprises the following steps: weighing the raw materials in parts by weight;
mixing ordinary portland cement and metakaolin uniformly;
dissolving sodium hydroxide in water, stirring thoroughly, standing for 12 hr, stirring again, adding ordinary portland cement and metakaolin, stirring at low speed for 5min, stopping stirring for 2min, and stirring at high speed for 5min to obtain grouting material. The above raw materials should be mixed thoroughly.
P.O 42.5 ordinary portland cement, metakaolin and sodium hydroxide are purchased externally.
Comparative example
The grouting material without metakaolin provided in this embodiment specifically includes: 1000ml of water, 1000g of Portland cement and 0.12g of sodium hydroxide are taken.
And (3) pouring sodium hydroxide into water, fully and uniformly stirring, standing for 12 hours, stirring again, adding the ordinary portland cement, stirring for 5 minutes, stopping stirring for 2 minutes, and stirring again for 5 minutes to prepare the grouting material.
Example 1
The geopolymer cement slurry-based grouting material in the high-ground-temperature environment provided by the embodiment specifically comprises the following components: taking 1000ml of water, 960g of cement, 40g of metakaolin and 1.2g of sodium hydroxide, pouring the ordinary portland cement and the metakaolin into a powder stirrer, and stirring for 5-15min to ensure uniform mixing.
And pouring sodium hydroxide into water, fully and uniformly stirring, standing for 12 hours, stirring again, adding the mixed ordinary portland cement and metakaolin, stirring for 5 minutes, stopping stirring for 2 minutes, and stirring for 5 minutes again to prepare the grouting material.
Example 2
The geopolymer cement slurry-based grouting material in the high-ground-temperature environment provided by the embodiment specifically comprises the following components: taking 1000ml of water, 920g of ordinary portland cement, 80g of metakaolin and 1.2g of sodium hydroxide, pouring the ordinary portland cement and the metakaolin into a powder stirrer, and stirring for 5-15min to ensure uniform mixing.
And pouring sodium hydroxide into water, fully and uniformly stirring, standing for 12 hours, stirring again, adding the mixed ordinary portland cement and metakaolin, stirring for 5 minutes, stopping stirring for 2 minutes, and stirring for 5 minutes again to prepare the grouting material.
Example 3
The geopolymer cement slurry-based grouting material in the high-ground-temperature environment provided by the embodiment specifically comprises the following components: taking 1000ml of water, 880g of cement, 120g of metakaolin and 1.2g of sodium hydroxide, pouring the ordinary portland cement and the metakaolin into a powder stirrer, and stirring for 5-15min to ensure uniform mixing.
And pouring sodium hydroxide into water, fully and uniformly stirring, standing for 12 hours, stirring again, adding the mixed ordinary portland cement and metakaolin, stirring for 5 minutes, stopping stirring for 2 minutes, and stirring for 5 minutes again to prepare the grouting material.
In order to verify the characteristics of the grouting material prepared in the present invention, the following tests were performed, in which the slurry refers to the grouting material prepared in the comparative example and each example, and the specific tests were as follows:
firstly, determination of slurry stability-water separation rate test:
pouring the serosity in each embodiment into a corresponding 250ml measuring cylinder, adding the serosity to 250ml scales by using a pipette when the serosity is close to 250ml, covering a preservative film and putting the preservative film into a constant temperature and humidity curing box with corresponding temperature, wherein the serosity in each embodiment is cured at five temperatures of 20 ℃, 30 ℃, 40 ℃, 50 ℃ and 60 ℃.
After standing for 2h, the measuring cylinder is taken out, and the volume of the precipitated water is recorded. The water separation rate of the slurry was obtained, and the results are shown in table 1:
TABLE 1 results of water separation test of slurries at different temperatures%
As can be seen from the data in Table 1, the water precipitation rate of the grouting material is smaller as the addition amount of metakaolin is increased; the same grouting material is more suitable for grouting as the water precipitation rate of the grouting material is smaller along with the increase of the temperature.
Secondly, measuring the slurry viscosity:
a Brookfield viscometer DV-2T is selected, and after the viscometer is powered on, the viscometer is zeroed while ensuring no rotor is connected.
Rotor No. 2 was selected and tested at 100RPM, the stirred slurry was poured into a 600ml beaker, heated and held, and placed under a viscometer, ready for testing.
Setting the ending condition as 50s, reading every 10s, collecting 5 data to average, unit cP, starting the test, and the test results are shown in Table 2:
TABLE 2 measurement of the viscosity of the slurries/cP at different temperatures
As can be seen from the data in table 2, as the amount of metakaolin added increases, the viscosity of the prepared slurry increases; and the viscosity of the prepared same slurry increases along with the temperature rise. The larger the viscosity of the slurry is, the more unfavorable the actual grouting is, so the quality of the prepared grouting material can not be judged by the index of the viscosity of the slurry alone. The water separation rate and the following test results should be combined for comprehensive judgment.
Thirdly, measuring the setting time of the slurry:
the setting time is tested according to the standard of GBT1346-2011 'inspection method for water consumption, setting time and stability of standard consistency of cement', the setting time of the slurry is measured at five different temperatures of 20 ℃, 30 ℃, 40 ℃, 50 ℃ and 60 ℃ in the test, the slurry needs to be heated in a water bath, and the slurry is placed in a constant temperature and humidity maintenance box for heat preservation, wherein the parameters of a Vicat instrument are as follows: the effective length of the initial setting steel needle is 50mm +/-1 mm, the effective length of the final setting steel needle is 30mm +/-1 mm, and the diameter is phi 1.13mm +/-0.05 mm; the effective length of the test rod is 50mm plus or minus 1mm, and the diameter is 10mm plus or minus 0.05 mm; the total mass of the sliding portion was 300 g. + -.1 g.
Coagulation time test: the test uses the slurry with the standard consistency as the slurry when a steel needle is immersed into the slurry and is 6mm +/-1 mm away from a bottom plate of a Vicat instrument, and during the test, a water bath protective sleeve filled with the slurry is firstly placed on the Vicat, the zero point position is calibrated, and then the required slurry is prepared.
a. Measurement of initial setting time:
placing the water bath protective sleeve containing the serous fluid at five different temperatures of 20 deg.C, 30 deg.C, 40 deg.C, 50 deg.C and 60 deg.C respectively, maintaining for 30min, and measuring the serous fluid for the first time. And adjusting the initial setting steel needle to a position suitable for the surface of the slurry, screwing the screw for about 2s, and suddenly loosening to enable the steel needle to freely fall into the slurry. After 30s a reading is recorded and placed again at the desired temperature. Repeating the steps, measuring once every 5min and recording data until the initial setting standard is reached, wherein the judgment standard is as follows: the initial setting steel needle sinks to 4mm +/-1 mm from the bottom plate, and the setting time is expressed in min from the time when the mixed slurry is stirred and poured into the water bath protective sleeve.
b. Determination of the Final setting time:
after the initial setting time is measured, the water bath sleeve and the calculus body are turned over together and are respectively placed at five different temperatures of 20 ℃, 30 ℃, 40 ℃, 50 ℃ and 60 ℃ for continuous maintenance. And (3) replacing a final setting steel needle, measuring once every 15min, recording data, and when the annular accessory on the final setting steel needle cannot leave a trace on the concretion body, sinking the steel needle into the concretion body by about 0.5mm, namely, the final setting is considered to be reached, wherein the setting time is expressed by min, and the setting time is calculated from the time when the mixed slurry is stirred and poured into the water bath protective sleeve.
c. The initial setting and final setting measurement results are shown in table 3:
TABLE 3 setting time/hh mm of slurries at different temperatures
As can be seen from the data in Table 3, as the amount of metakaolin added increases, the setting times for both the initial setting and the final setting of the slurry become longer; and the setting time of the initial setting and the final setting of the slurry becomes shorter along with the increase of the temperature.
Fourthly, measuring the strength of the stone body formed by the coagulation of the serous fluid:
(1) the prepared slurry of the comparative example and each example is respectively poured into a triple test mould of 40mm multiplied by 160mm, covered with a preservative film and put into a constant-temperature constant-humidity curing box of 20 ℃, 30 ℃, 40 ℃, 50 ℃ and 60 ℃ for curing for 24 hours.
(2) And continuously curing the demoulded test piece to 3d, 7d, 14d and 28d at corresponding temperatures.
(3) With reference to GB/T17671 "Cement mortar Strength test method", test pieces maintained to a specified age were subjected to a compression strength test using a compression tester, and the test results are shown in Table 4.
TABLE 4 compressive Strength/MPa of the slurry concretion at different temperatures
As can be seen from the data in Table 4, the compressive strength of the slurry agglomerate increased first and then decreased as the amount of metakaolin added increased. The compressive strength of the slurry of each example, the 3d to 28d concretion body, continues to increase at the temperature of 20 ℃, 30 ℃ and 40 ℃ in the low temperature region. In the slurry of each example, the compressive strength of the 3d to 14d concretion bodies continued to increase and the compressive strength of the 28d concretion bodies decreased at the temperatures of 50 ℃ and 60 ℃ in the high temperature region. In example 3, the compressive strength of the aggregate body of the prepared grouting material decreased slowly with the number of days.
Fifthly, measuring the heat insulation performance of the stone body formed by the coagulation of the serous fluid:
(1) the slurries prepared in comparative example and example 2 were prepared into a stone body, and the cured stone body was cut into sheets of 200mm × 200mm × 15mm, and the surface was polished smooth.
(2) The sheet metal that will polish is put into the heat conduction appearance, and the adjustment instrument parameter, the instrument model is: KY-DRX-PB heat conductivity coefficient tester.
(3) Starting thermal conductivity test software, entering a test interface, setting the thickness of a sample, starting a test by pressing an automatic test button after starting temperature rise, and obtaining test results as shown in table 5:
TABLE 5 slurry Heat conductivity at different temperatures
As can be seen from the data in table 5, the slurry prepared in example 2 has a small thermal conductivity, indicating that the slurry prepared by adding metakaolin has a good heat insulation effect after solidification
From the test structure, compared with pure cement slurry, the slurry prepared by adding metakaolin can ensure sufficient calculus rate, higher strength and lower heat conductivity coefficient when being used for underground engineering grouting construction in a high-ground-temperature environment. The reason is that the high-activity metakaolin has the function of cementation, the hydration product of the metakaolin can further react with the hydration product of portland cement, a more violent hydration reaction can be carried out at a higher temperature, the hydration of the cement is promoted, the hydration product is rapidly precipitated and lapped, the contractibility of the solution is reduced, and the excessive addition of sodium hydroxide as an alkali activator can lead the alkali content Ca (OH) in the set cement2Increase and inhibit cement hydration rate, simultaneously can almost completely convert Al phase with complex coordination in the metakaolin into four coordination, convert or decompose into new aluminum tetrahedron monomer, simultaneously Si-O-Si chain in the metakaolin can also decompose and recombine, and a part of silicon-oxygen tetrahedron in the chain can be replaced by aluminum tetrahedron, thereby forming SiO4、AlO4The chain or net structure with different combination arrangement modes can achieve the purposes of improving the compressive strength of the grouting material and reducing the thermal conductivity.
Claims (8)
1. A geopolymer-containing cement slurry-based grouting material suitable for a high ground temperature environment is characterized by being prepared from the following raw materials in parts by weight: 100 parts of solid material, 0.12 part of sodium hydroxide and water;
wherein the weight parts of water meet the following requirements: the water-cement ratio is 1:1, and the ash is the weight part of solid materials; the water-cement ratio is expressed as the ratio of parts by weight of water to parts by weight of ash;
the solid material is composed of the following raw materials in parts by weight: 88-96 parts of ordinary portland cement and 4-12 parts of metakaolin.
2. The geopolymer-containing cement slurry-based grouting material suitable for the high ground temperature environment according to claim 1 is characterized by being prepared from the following raw materials in parts by weight: 92 parts of ordinary portland cement, 8 parts of high-activity metakaolin, 0.12 part of sodium hydroxide and 100 parts of water.
3. A geopolymer cement slurry-based grouting material suitable for high ground temperature environment according to claim 1 or 2, characterized in that the ordinary portland cement is P-O42.5 portland cement.
4. The geopolymer-containing cement slurry-based grouting material applicable to a high ground temperature environment as claimed in claim 3, wherein the fineness of metakaolin is not greater than that of ordinary portland cement.
5. The geopolymer-containing cement slurry-based grouting material applicable to a high geothermal environment as claimed in claim 4, wherein the metakaolin has a fineness of 1250 meshes, an activity index of not less than 110, a SiO2 content of 54.06%, an Al2O3 content of 43.12%, a Fe2O3 content of 0.76%, a CaO content of 0.17%, and a K2O content of 0.55%.
6. The geopolymer-containing cement slurry-based grouting material suitable for high-ground-temperature environments of claim 5, wherein the sodium hydroxide is of analytical pure AR grade.
7. A geopolymer-containing cement slurry-based grouting material suitable for high ground temperature environments as claimed in claim 6, wherein the water is tap water.
8. The preparation method of the geopolymer-containing cement slurry-based grouting material suitable for the high geothermal environment as claimed in any one of claims 1 to 7, wherein the raw materials are weighed in parts by weight;
mixing ordinary portland cement and metakaolin uniformly;
dissolving sodium hydroxide in water, stirring thoroughly, standing for 12 hr, stirring again, adding ordinary portland cement and metakaolin, stirring at low speed for 5min, stopping stirring for 2min, and stirring at high speed for 5min to obtain grouting material.
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Citations (3)
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|---|---|---|---|---|
| US6221148B1 (en) * | 1999-11-30 | 2001-04-24 | Engelhard Corporation | Manufacture of improved metakaolin by grinding and use in cement-based composites and alkali-activated systems |
| CN104098281A (en) * | 2013-04-03 | 2014-10-15 | 神华集团有限责任公司 | Geopolymer composition, geopolymer material and preparation method thereof |
| CN113173746A (en) * | 2021-05-06 | 2021-07-27 | 昆明理工大学 | Geopolymer gel material based on copper tailings and preparation method thereof |
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| US6221148B1 (en) * | 1999-11-30 | 2001-04-24 | Engelhard Corporation | Manufacture of improved metakaolin by grinding and use in cement-based composites and alkali-activated systems |
| CN104098281A (en) * | 2013-04-03 | 2014-10-15 | 神华集团有限责任公司 | Geopolymer composition, geopolymer material and preparation method thereof |
| CN113173746A (en) * | 2021-05-06 | 2021-07-27 | 昆明理工大学 | Geopolymer gel material based on copper tailings and preparation method thereof |
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