CN112239330A - Alkali-activated tuff cementing material and preparation method thereof - Google Patents
Alkali-activated tuff cementing material and preparation method thereof Download PDFInfo
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- CN112239330A CN112239330A CN202011224879.XA CN202011224879A CN112239330A CN 112239330 A CN112239330 A CN 112239330A CN 202011224879 A CN202011224879 A CN 202011224879A CN 112239330 A CN112239330 A CN 112239330A
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- tuff
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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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- 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
- C04B7/00—Hydraulic cements
- C04B7/24—Cements from oil shales, residues or waste other than slag
- C04B7/243—Mixtures thereof with activators or composition-correcting additives, e.g. mixtures of fly ash and alkali activators
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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
- C04B7/00—Hydraulic cements
- C04B7/36—Manufacture of hydraulic cements in general
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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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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses an alkali-activated tuff cementing material and a preparation method thereof. The concrete dosage of the tuff powder, the sodium hydroxide solution and the sodium silicate solution is that the mass ratio of the tuff powder to the sodium hydroxide solution to the sodium silicate solution is 25:10: 1. The invention excites the tuff powder by the alkali solution, so that the compressive strength of the tuff powder after being hardened as a cementing material for 7 days can reach 36MPa, which is 85 percent of the compressive strength of common Portland cement for 7 days; the density was 1720kg/m3And is 88% of the density of the ordinary Portland cement sample. The preparation process does not need calcination and steam curing, and effectively solves the problems that the tuff powder generated in the process of preparing sand by machine-made sand and other industrial production processes can not be treated and pollutes the environment.
Description
Technical Field
The invention relates to the technical field of building materials, in particular to a preparation method of an alkali-activated tuff cementing material.
Background
The large amount of stone powder generated in the process of producing the machine-made sand by the dry method not only causes dust pollution, but also obviously reduces the working performance of concrete when the stone powder is mixed in the machine-made sand, and the treatment of the stone powder is generally collected and deeply buried or used as a concrete admixture, the deep burying has high cost and certain influence on the environment, and the treatment amount is very limited when the stone powder is used as the concrete admixture and influences the working performance of the concrete. Therefore, the method for recycling the stone powder generated in the machine-made sand and changing waste into valuable can not only generate great economic benefit, but also generate great environmental benefit.
Alkali-activated cementitious materials are currently developed in many countries, and the huge content of silica and alumina in tuff indicates that the tuff has huge alkali-activated potential. However, in the current research at home and abroad, most alkali-activated materials or precursors need to be calcined, or samples need to be cured by steaming or pressurizing, or a certain amount of cement needs to be added (Glukhovsky, 1994; Allahverdi, 2008; Dali, 2011; Ebrahim, 2012; Li, 2020et. al), and the environmental protection and the economical efficiency of geopolymers are reduced due to the limitation of the processing and curing modes of the precursors. For example, in the tuff powder, the invention patent of a tuff geopolymer composite material and a preparation method thereof (202010447662.9) is disclosed, wherein the tuff is prepared into a composite silicate material by adopting a method of partially replacing silicate cement, and the tuff is firstly ground to 75-85 μm. The invention discloses an environment-friendly cementing material and a preparation method and application thereof (202010387846.0), which adopts 800 ℃ high-temperature calcination tuff to form a composite material with quicklime and fly ash.
Disclosure of Invention
In order to solve the environmental problems that the current industrial solid waste tuff powder pollutes the environment, cement production consumes huge energy and discharges a large amount of carbon dioxide, the invention provides the alkali-activated tuff cementing material which does not need to be ground, steamed and cured, does not need to be calcined at high temperature and does not need to be added with other materials such as cement, fly ash and the like and the preparation method thereof, thereby solving the problems that the tuff powder pollutes the environment, realizing the secondary utilization of solid waste and reducing the energy consumption and the large amount of carbon dioxide discharge caused by using cement.
An alkali-activated tuff cement, comprising in weight percent: 69.4% tuff powder, 27.8% sodium hydroxide (NaOH) solution, 2.8% sodium silicate (Na)2SO4) The particle size of the tuff powder is 0.01-0.03 mm, and the specific surface area of the powder is greater than or equal to 1.1644m2(g) silicon dioxide (SO) in powder2) 65% or more of aluminum oxide (Al)2O3) The content is more than or equal to 11 percent, and the content of calcium oxide (CaO) is less than 5 percent. The prepared alkali-activated tuff cementing material has the compression strength of 36MPa in 7 days and the density of 1720kg/m3。
Further, the concentration of the sodium hydroxide (NaOH) solution is 7.5mol/L, and the mass fraction of the solute is 30%.
Further, said sodium silicate (Na)2SiO4) The concentration of the solution is 0.164mol/L, and the mass fraction of the solute is 2%.
A preparation method of an alkali-activated tuff cementing material comprises the following steps:
step 1, putting tuff powder extracted under negative pressure in a tuff machine-made sand production process into a slurry stirrer, and adding a sodium hydroxide solution to stir for 5 minutes;
step 2, stirring for 5 minutes according to the step 1, adding a sodium silicate solution into the slurry, and continuously stirring for 5 minutes;
step 3, filling the slurry mixed in the step 2 into a silica gel mold, after filling the silica gel mold into the mold, using an inserting and tamping rod for inserting and tamping, keeping the inserting and tamping rod vertical during inserting and tamping, uniformly inserting and tamping in the mold, after inserting and tamping, vibrating the sample by using a vibrating table, inserting and tamping the surface of the sample by using the inserting and tamping rod while vibrating, stopping inserting and tamping after vibrating for 3 minutes, then vibrating for 30 seconds to keep the surface of the sample flat, and stopping vibrating to ensure that the concrete is fully dense;
step 4, curing the test block after being filled with the mold in an oven at the temperature of 60 ℃ for 2 hours, then demolding, then placing the test block in a culture dish, sealing and placing the test block in the oven at the temperature of 60 ℃ for continuous curing, wherein the curing period is 7 days;
step 5, measuring the density of the test block and the compressive strength, wherein the density measurement adopts a balance and a vernier caliper to measure the mass, the length, the width and the height of three parallel test samples respectively, the average value of the calculated size and the calculated density is the density of the alkali-activated tuff cementing material, and the requirement is 1720kg/m3(ii) a The compressive strength is measured by a universal tester, and the compressive strength requirement is 36 MPa.
According to the alkali-activated tuff cementing material provided by the invention, the precursor is powder collected under negative pressure in the production process of machine-made sand, grinding is not needed, calcination and steam curing are not needed in the preparation process, other materials such as cement and fly ash are not needed to be added, the strength of the material reaches 85% of that of the cement, the mass of the material is reduced by 12%, and prefabricated parts and building blocks in building engineering made of the material have strong environmental protection and economical efficiency.
Drawings
The present invention is described in further detail below with reference to the attached drawings.
FIG. 1 is an SEM image of tuff powder particles of the present invention.
FIG. 2 is a stress-strain relationship diagram of the alkali-activated tuff cement of the present invention.
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 detailed description and specific examples, while indicating the preferred embodiment of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention.
A preparation method of an alkali-activated tuff cementing material comprises the following steps:
(1) taking stone powder extracted under negative pressure in the production process of tuff machine-made sand for SEM and XRF analysis;
(2) 500g of tuff powder is taken and placed in a slurry mixer, 200g of sodium hydroxide solution is added and mixed for 5 minutes;
(3) stirring for 5 minutes according to the step (2), adding 20g of sodium silicate solution into the slurry, and continuing stirring for 5 minutes;
(4) loading the slurry mixed in the step (3) into a silica gel mold, after loading into the mold, inserting and tamping by using a thin plastic inserting and tamping rod, keeping the inserting and tamping rod vertical during inserting and tamping, uniformly inserting and tamping in the mold, after inserting and tamping, vibrating the sample by using a vibrating table, changing vibration into vibration, inserting and tamping on the surface of the sample by using the inserting and tamping rod, stopping inserting and tamping after vibrating for 3 minutes, vibrating for 30 seconds to keep the surface of the sample flat, and stopping vibrating to ensure that the concrete is fully dense;
(5) curing the test block after being filled with the mold in an oven at the temperature of 60 ℃ for 2 hours, then demolding, then placing the test block in a culture dish, sealing and placing the test block in the oven at the temperature of 60 ℃ for continuous curing, wherein the curing period is 7 days;
(6) measuring the density of the test block and the compressive strength, wherein the density measurement adopts a balance and a vernier caliper, the mass, the length, the width and the height of three parallel test samples are respectively measured, the size and the density are calculated, the average value is taken as the density of the alkali-activated tuff cementing material, and the density is 1720kg/m3(ii) a The compressive strength was measured by a universal tester and was 36 MPa.
FIG. 1 is an SEM image of tuff powder particles of the invention, and XRF analysis of the tuff powder particles of the invention is shown in Table 1:
TABLE 1
The stress-strain relationship of the alkali-activated tuff cement of the present invention is shown in fig. 2.
The invention discloses an alkali-activated tuff cementing material and a preparation method thereof. The concrete dosage of the tuff powder, the sodium hydroxide solution and the sodium silicate solution is 25:10: 1. The invention can lead the compression strength of the tuff powder as a cementing material to reach 36MPa after 7 days of hardening and to be 85 percent of the compression strength of common Portland cement after 7 days of hardening by exciting the tuff powder by the alkali solution. The density was 1720kg/m3And is 88% of the density of the ordinary Portland cement sample. The preparation process does not need calcination and steam curing, and effectively solves the problems that the tuff powder generated in the process of preparing sand by machine-made sand and other industrial production processes can not be treated and pollutes the environment.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art will understand that various changes, modifications and substitutions can be made without departing from the spirit and scope of the invention as defined by the appended claims. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (5)
1. An alkali-activated tuff cementing material, which is characterized by comprising the following components in percentage by weight: 69.4% of tuff powder, 27.8% of sodium hydroxide solution and 2.8% of sodium silicate solution, wherein the 7-day compressive strength of the cementing material is 36 MPa.
2. An alkali-activated tuff cement according to claim 1, characterized in that: the precursor is solid waste-tuff powder in industrial production, the particle size of the powder is 0.01-0.03 mm, and the specific surface area of the powder is greater than or equal to 1.1644m2The content of silicon dioxide in the powder is more than or equal to 65 percent, the content of aluminum oxide is more than or equal to 11 percent, and the content of calcium oxide is less than 5 percent.
3. An alkali-activated tuff cement according to claim 1, characterized in that: the molar concentration of the sodium hydroxide solution is 7.5mol/L, and the mass fraction of the solute is 30%.
4. An alkali-activated tuff cement according to claim 1, characterized in that: the concentration of the sodium silicate solution is 0.164mol/L, and the mass fraction of the solute is 2%.
5. A process for the preparation of an alkali-activated tuff cement according to any one of claims 1 to 4, characterized in that it comprises the following steps:
step 1, putting tuff powder extracted under negative pressure in a tuff machine-made sand production process into a slurry stirrer, and adding a sodium hydroxide solution to stir for 5 minutes;
step 2, stirring for 5 minutes according to the step 1, adding a sodium silicate solution into the slurry, and continuously stirring for 5 minutes;
step 3, filling the slurry mixed in the step 2 into a silica gel mold, after filling the silica gel mold into the mold, using an inserting and tamping rod for inserting and tamping, keeping the inserting and tamping rod vertical during inserting and tamping, uniformly inserting and tamping in the mold, after inserting and tamping, vibrating the sample by using a vibrating table, inserting and tamping the surface of the sample by using the inserting and tamping rod while vibrating, stopping inserting and tamping after vibrating for 3 minutes, then vibrating for 30 seconds to keep the surface of the sample flat, and stopping vibrating to ensure that the material is fully dense;
step 4, curing the test block after being filled with the mold in an oven at the temperature of 60 ℃ for 2 hours, then demolding, then placing the test block in a culture dish for sealing, placing the test block in the oven at the temperature of 60 ℃ for continuous curing, wherein the curing period is 7 days;
step 5, measuring the density of the test block and the compressive strength, wherein the density measurement adopts a balance and a vernier caliper to measure the mass, the length, the width and the height of three parallel test samples respectively, the average value of the calculated size and the calculated density is the density of the alkali-activated tuff cementing material, and the requirement is 1720kg/m3(ii) a The compressive strength is measured by a universal tester, and the compressive strength requirement is 36 MPa.
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| CN202011224879.XA CN112239330A (en) | 2020-11-05 | 2020-11-05 | Alkali-activated tuff cementing material and preparation method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114031317A (en) * | 2021-11-12 | 2022-02-11 | 兰州大学 | Method for preparing blast furnace slag modified siliceous stone powder cementing materials with different properties by controlling water loss rate |
| CN115321863A (en) * | 2022-08-29 | 2022-11-11 | 中国电建集团华东勘测设计研究院有限公司 | Sintered tuff powder synergistic strengthening recycled aggregate, preparation method and cement-stabilized macadam base |
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| CN108218264A (en) * | 2018-01-17 | 2018-06-29 | 福州大学 | It is a kind of using lime-sodium carbonate as the one-component alkali-activated carbonatite cementitious material of exciting agent |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114031317A (en) * | 2021-11-12 | 2022-02-11 | 兰州大学 | Method for preparing blast furnace slag modified siliceous stone powder cementing materials with different properties by controlling water loss rate |
| CN114031317B (en) * | 2021-11-12 | 2022-10-11 | 兰州大学 | Method for preparing blast furnace slag modified siliceous stone powder cementing materials with different properties by controlling water loss rate |
| CN115321863A (en) * | 2022-08-29 | 2022-11-11 | 中国电建集团华东勘测设计研究院有限公司 | Sintered tuff powder synergistic strengthening recycled aggregate, preparation method and cement-stabilized macadam base |
| CN115321863B (en) * | 2022-08-29 | 2023-12-01 | 中国电建集团华东勘测设计研究院有限公司 | Sintered tuff powder synergistic reinforcement recycled aggregate, preparation method and cement stabilized macadam base |
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