CN111138104A - Method for preparing geopolymer gelled material by adopting regenerated micro powder - Google Patents
Method for preparing geopolymer gelled material by adopting regenerated micro powder Download PDFInfo
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- CN111138104A CN111138104A CN202010024887.3A CN202010024887A CN111138104A CN 111138104 A CN111138104 A CN 111138104A CN 202010024887 A CN202010024887 A CN 202010024887A CN 111138104 A CN111138104 A CN 111138104A
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- 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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding
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Abstract
The invention discloses a method for preparing a geopolymer cementing material by using regenerated micro powder, wherein the cementing material is obtained by mixing geopolymer powder and an alkali activator, stirring for a period of time, forming slurry and performing standard maintenance, wherein the geopolymer powder consists of 30-70 wt% of slag powder and 30-70 wt% of regenerated micro powder. The geopolymer cementing material prepared by the invention has higher strength and good contractibility, can solve the problem of contraction and cracking of common concrete materials, and meanwhile, the invention takes the regenerated micro powder as the raw material, effectively utilizes building waste, and is a green and environment-friendly method.
Description
Technical Field
The invention relates to the technical field of building materials, in particular to a method for preparing a geopolymer cementing material by using regenerated micro powder.
Background
The powder produced in the preparation process of the recycled aggregate is called recycled micro powder for short, so the recycled micro powder specifically refers to stone chips or cement stones and other fine particles produced in the recycling, crushing and regenerating processes of construction wastes such as waste concrete and the like, the fine particles have certain potential activity, but are often regarded as garbage landfill, and are gradually used for preparing building materials such as mortar, concrete and the like nowadays.
The concept of geopolymers was proposed in 1985 from us patent by Joseph Davidovits, a french scientist, whose performance is similar to that of cement but superior to that of cement, making it possible to replace cement. With the intensive research on geopolymers, geopolymers are widely used in the construction industry, such as replacing part of cement in reinforced concrete. The geopolymer raw material in the current building market is mainly prepared by mixing metakaolin, blast furnace slag powder and fly ash. The raw materials for producing the metakaolin are single, and the metakaolin has certain influence on the natural environment in the preparation process, so that the metakaolin does not meet the requirements of modern green environment-friendly building materials.
Disclosure of Invention
The invention aims to provide a method for preparing a geopolymer gelled material by using regenerated micro powder. The cementing material has higher strength, volume stability and water stability, and the raw material is construction waste, so that the problem of recycling construction waste is solved to a certain extent.
The technical solution for realizing the invention is as follows:
a method for preparing a geopolymer cementing material by using regenerated micro powder comprises the steps of mixing geopolymer powder and an alkali activator, stirring for a period of time, forming slurry, and performing standard curing, wherein the geopolymer powder is prepared from 30-70 wt% of slag powder and 30-70 wt% of regenerated micro powder.
Preferably, the alkali activator is a mixed aqueous solution of sodium hydroxide and sodium silicate, wherein the sodium hydroxide and the sodium silicate are respectively 3-9 wt% of the mass content of the geopolymer powder, and the water-solid ratio (i.e. water to geopolymer powder) is 0.32-0.45.
Preferably, the regenerated fine powder has a particle size of 75 μm or less.
Preferably, the particle size of the slag powder is less than 60 μm.
Preferably, the cementing material is prepared by mixing geopolymer powder and an alkali activator, slowly stirring for 2min, and then quickly stirring for 2min, wherein the rotation speed of slow stirring is (140 +/-5) r/min, and the revolution speed is (125 +/-5) r/min;
the rotation speed of the rapid stirring is (285 +/-10) r/min, and the revolution speed is (125 +/-10) r/min.
Compared with the prior art, the invention has the advantages that: the invention provides a new application way for the regenerated micro powder with less regeneration and utilization methods at present, the prepared geopolymer gel material has higher compression strength and rupture strength, the 7d unconfined strength of the prepared geopolymer is more than or equal to 4MPa, the 90d curing and splitting strength is more than or equal to 0.35MPa, the water stability coefficient is more than 75 percent, the material is a novel environment-friendly material, the raw material adopts building waste, and the cost has greater advantages compared with the same product.
Drawings
FIG. 1 is a flow chart of the preparation of the geopolymer gel material according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely below, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention belong to the protection scope of the present invention.
Collecting the powder generated in the preparation process of the recycled aggregate by a dust remover or other equipment, and grinding the powder for 16min by a QM3SP2L type grinder to prepare the recycled micro powder with the particle size of less than 75 microns.
The geopolymer cementing material is prepared by the following steps:
(1) mixing NaOH and Na2SiO3Weighing the granules according to the preparation proportion, weighing the distilled water for the test, pouring the distilled water into two beakers, and respectively adding NaOH and Na2SiO3Continuously stirring the particles with a glass rod until the particles are completely dissolved, mixing the two solutions, continuously stirring for 1min, standing at room temperature, and cooling for 15 min;
(2) pouring the alkali solution obtained in the step (1) into a mixing pot, weighing the regenerated micro powder with the size of less than 75 micrometers (the composition of the regenerated micro powder is shown in table 1) and the slag powder with the size of less than 60 micrometers (the composition of the granulated blast furnace slag powder is shown in table 1) according to the proportion, uniformly mixing the two kinds of powder, and adding the powder into the mixing pot of a net slurry mixer;
(3) slowly stirring for 2min, quickly stirring for 2min, pouring the obtained slurry into a 40 × 40 × 160mm mold, vibrating on a vibrating table for 60s, smoothing the surface, covering the surface with a preservative film after molding, placing in a standard curing box, curing for 24h, demolding, and continuously curing for 6 d. The flow chart is shown in figure 1.
TABLE 1 construction waste micropowder and Fine slag micropowder chemical composition (%)
Example 1: 70 percent of regenerated micro powder and 30 percent of slag powder by mass percentage of geopolymer powder, namely 70/30, M is regenerated micro powder/slag powderNaOH/MSolid (Geopolymer powder)3 wt%, MNa2SiO3/MSolid (Geopolymer powder)6 wt%, water-to-solid ratio, namely MWater (W)/MSolid (Geopolymer powder)Is 0.44. Mixing NaOH and Na2SiO3Weighing the granules according to the preparation proportion, weighing the distilled water for the test, pouring the distilled water into two beakers, and respectively adding NaOH and Na2SiO3And (2) continuously stirring the particles by using a glass rod until the particles are completely dissolved, mixing the two solutions, continuously stirring for 1min, standing and cooling for 15min at room temperature, pouring the obtained mixed alkali solution into a stirring pot, weighing the regenerated micro powder and the slag powder according to the proportion, uniformly mixing the two powders, adding the mixture into the stirring pot of a clean slurry stirrer, slowly stirring for 2min, quickly stirring for 2min, pouring the obtained slurry into a 40X 160mm mould, placing the mould into a standard curing box, curing for 24h, demoulding, and continuously curing for 6 d. 3 samples were prepared for each formulation, and after the curing period was reached, the flexural strength and compressive strength were measured and averaged, and the results are shown in table 2.
Practice ofExample 2: the mass percentage of the geopolymer powder is that the regenerated micro powder is 50 percent, the slag powder is 50 percent, namely the regenerated micro powder/slag powder is 50/50, MNaOH/MSolid (Geopolymer powder)6 wt%, MNa2SiO3/MSolid (Geopolymer powder)9 wt% and a water-to-solid ratio of 0.40. Mixing NaOH and Na2SiO3Weighing the granules according to the preparation proportion, weighing the distilled water for the test, pouring the distilled water into two beakers, and respectively adding NaOH and Na2SiO3And (2) continuously stirring the particles by using a glass rod until the particles are completely dissolved, mixing the two solutions, continuously stirring for 1min, standing and cooling for 15min at room temperature, pouring the obtained mixed alkali solution into a stirring pot, weighing the regenerated micro powder and the slag powder according to the proportion, uniformly mixing the two powders, adding the mixture into the stirring pot of a clean slurry stirrer, slowly stirring for 2min, quickly stirring for 2min, pouring the obtained slurry into a 40X 160mm mould, placing the mould into a standard curing box, curing for 24h, demoulding, and continuously curing for 6 d. 3 samples were prepared for each formulation, and after the curing period was reached, the flexural strength and compressive strength were measured and averaged, and the results are shown in table 2.
Example 3: the mass percentage of the geopolymer powder is 30 percent of the regenerated micro powder and 70 percent of the slag powder, namely the regenerated micro powder/slag powder is 30/70, MNaOH/MSolid (Geopolymer powder)3 wt%, MNa2SiO3/MSolid (Geopolymer powder)9 wt% and a water-to-solid ratio of 0.36. Mixing NaOH and Na2SiO3Weighing the granules according to the preparation proportion, weighing the distilled water for the test, pouring the distilled water into two beakers, and respectively adding NaOH and Na2SiO3And (2) continuously stirring the particles by using a glass rod until the particles are completely dissolved, mixing the two solutions, continuously stirring for 1min, standing and cooling for 15min at room temperature, pouring the obtained mixed alkali solution into a stirring pot, weighing the regenerated micro powder and the slag powder according to the proportion, uniformly mixing the two powders, adding the mixture into the stirring pot of a clean slurry stirrer, slowly stirring for 2min, quickly stirring for 2min, pouring the obtained slurry into a 40X 160mm mould, placing the mould into a standard curing box, curing for 24h, demoulding, and continuously curing for 6 d. 3 samples were prepared for each formulation, and after the curing period was reached, the flexural strength and compressive strength were measured and averaged, and the results are shown in table 2.
Example 4:the mass percentage of the geopolymer powder is 30 percent of the regenerated micro powder and 70 percent of the slag powder, namely the regenerated micro powder/slag powder is 30/70, MNaOH/MSolid (Geopolymer powder)6 wt%, MNa2SiO3/MSolid (Geopolymer powder)6 wt% and a water-to-solid ratio of 0.32. Mixing NaOH and Na2SiO3Weighing the granules according to the preparation proportion, weighing the distilled water for the test, pouring the distilled water into two beakers, and respectively adding NaOH and Na2SiO3And (2) continuously stirring the particles by using a glass rod until the particles are completely dissolved, mixing the two solutions, continuously stirring for 1min, standing and cooling for 15min at room temperature, pouring the obtained mixed alkali solution into a stirring pot, weighing the regenerated micro powder and the slag powder according to the proportion, uniformly mixing the two powders, adding the mixture into the stirring pot of a clean slurry stirrer, slowly stirring for 2min, quickly stirring for 2min, pouring the obtained slurry into a 40X 160mm mould, placing the mould into a standard curing box, curing for 24h, demoulding, and continuously curing for 6 d. 3 samples were prepared for each formulation, and after the curing period was reached, the flexural strength and compressive strength were measured and averaged, and the results are shown in table 2.
Example 5: the mass percentage of the geopolymer powder is 30 percent of the regenerated micro powder and 70 percent of the slag powder, namely the regenerated micro powder/slag powder is 30/70, MNaOH/MSolid (Geopolymer powder)9 wt% of MNa2SiO3/MSolid (Geopolymer powder)3 wt% and a water-to-solid ratio of 0.44. Mixing NaOH and Na2SiO3Weighing the granules according to the preparation proportion, weighing the distilled water for the test, pouring the distilled water into two beakers, and respectively adding NaOH and Na2SiO3And (2) continuously stirring the particles by using a glass rod until the particles are completely dissolved, mixing the two solutions, continuously stirring for 1min, standing and cooling for 15min at room temperature, pouring the obtained mixed alkali solution into a stirring pot, weighing the regenerated micro powder and the slag powder according to the proportion, uniformly mixing the two powders, adding the mixture into the stirring pot of a clean slurry stirrer, slowly stirring for 2min, quickly stirring for 2min, pouring the obtained slurry into a 40X 160mm mould, placing the mould into a standard curing box, curing for 24h, demoulding, and continuously curing for 6 d. 3 samples were prepared for each formulation, and after the curing period was reached, the flexural strength and compressive strength were measured and averaged, and the results are shown in table 2.
TABLE 2 basic polymer gel composition
As shown in Table 2, the geopolymer cement for semi-rigid base course has sufficient strength and can be used in actual construction. And the geopolymer cementing material has good volume stability, and can solve the problem of shrinkage cracking. The performance of examples 2 and 4 is superior.
The invention adds the regenerated micro powder, fully utilizes the construction waste and is a green and environment-friendly material.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.
Claims (8)
1. The method for preparing the geopolymer cementing material by using the regenerated micro powder is characterized in that the cementing material is obtained by mixing geopolymer powder and an alkali activator, stirring for a period of time, forming slurry and performing standard maintenance, wherein the geopolymer powder consists of 30-70 wt% of slag powder and 30-70 wt% of regenerated micro powder.
2. The method according to claim 1, wherein the alkali activator is a mixed aqueous solution of sodium hydroxide and sodium silicate, wherein the sodium hydroxide and the sodium silicate are respectively 3-9 wt% of the geopolymer powder, and the water-solid ratio is 0.32-0.45.
3. The method according to claim 1, wherein the reclaimed fine powder has a particle size of 75 μm or less.
4. The method of claim 1, wherein the slag powder has a particle size of 60 μm or less.
5. The method according to claim 1, wherein the cementitious material is prepared by mixing geopolymer powder with an alkaline activator, followed by slow stirring for 2min and then fast stirring for 2min, wherein the rotation speed of slow stirring is (140 ± 5) r/min and the revolution speed is (125 ± 5) r/min; the rotation speed of the rapid stirring is (285 +/-10) r/min, and the revolution speed is (125 +/-10) r/min.
6. The method of claim 1, wherein the standard curing temperature is 20 ℃ and the humidity is greater than 95%.
7. Geopolymer cement prepared by the process according to any one of claims 1 to 6.
8. The material of claim 7, wherein the geopolymer cement has a 7d unconfined strength of 4MPa or more, a 90d curing cleavage strength of 0.35MPa or more, and a water stability factor of more than 75%.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111548068A (en) * | 2020-05-18 | 2020-08-18 | 福州大学 | Single component recycled polymer cement concrete |
| CN111646713A (en) * | 2020-06-24 | 2020-09-11 | 扬州大学 | Basalt fiber reinforced regenerated micro powder geopolymer and preparation method thereof |
| CN112142381A (en) * | 2020-09-24 | 2020-12-29 | 浙江绿农生态环境有限公司 | Fiber-reinforced geopolymer based on recycled concrete aggregate and preparation method thereof |
| CN112174554A (en) * | 2020-10-15 | 2021-01-05 | 江苏尼高科技有限公司 | Single-component modified geopolymer and application thereof |
| CN112707658A (en) * | 2020-12-30 | 2021-04-27 | 湖南大学 | Method for preparing regenerated UHPC cement by using waste ultrahigh-performance concrete |
| CN113716898A (en) * | 2021-07-30 | 2021-11-30 | 东南大学 | Modified high-strength geopolymer cementing material and preparation method thereof |
| CN114735958A (en) * | 2022-04-29 | 2022-07-12 | 浙江天造环保科技有限公司 | Preparation method of geopolymer |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111548068A (en) * | 2020-05-18 | 2020-08-18 | 福州大学 | Single component recycled polymer cement concrete |
| CN111646713A (en) * | 2020-06-24 | 2020-09-11 | 扬州大学 | Basalt fiber reinforced regenerated micro powder geopolymer and preparation method thereof |
| CN112142381A (en) * | 2020-09-24 | 2020-12-29 | 浙江绿农生态环境有限公司 | Fiber-reinforced geopolymer based on recycled concrete aggregate and preparation method thereof |
| CN112174554A (en) * | 2020-10-15 | 2021-01-05 | 江苏尼高科技有限公司 | Single-component modified geopolymer and application thereof |
| CN112707658A (en) * | 2020-12-30 | 2021-04-27 | 湖南大学 | Method for preparing regenerated UHPC cement by using waste ultrahigh-performance concrete |
| CN113716898A (en) * | 2021-07-30 | 2021-11-30 | 东南大学 | Modified high-strength geopolymer cementing material and preparation method thereof |
| CN113716898B (en) * | 2021-07-30 | 2022-08-19 | 东南大学 | Modified high-strength geopolymer cementing material and preparation method thereof |
| CN114735958A (en) * | 2022-04-29 | 2022-07-12 | 浙江天造环保科技有限公司 | Preparation method of geopolymer |
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Application publication date: 20200512 |