CN114031317A - Method for preparing blast furnace slag modified siliceous stone powder cementing materials with different properties by controlling water loss rate - Google Patents
Method for preparing blast furnace slag modified siliceous stone powder cementing materials with different properties by controlling water loss rate Download PDFInfo
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- CN114031317A CN114031317A CN202111337799.XA CN202111337799A CN114031317A CN 114031317 A CN114031317 A CN 114031317A CN 202111337799 A CN202111337799 A CN 202111337799A CN 114031317 A CN114031317 A CN 114031317A
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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
- C04B7/246—Cements from oil shales, residues or waste other than slag from waste building materials, e.g. waste asbestos-cement products, demolition waste
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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
- 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
- C04B28/006—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 mineral polymers, e.g. geopolymers of the Davidovits type
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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
- C04B7/14—Cements containing slag
- C04B7/147—Metallurgical slag
- C04B7/153—Mixtures thereof with other inorganic cementitious materials or other activators
- C04B7/1535—Mixtures thereof with other inorganic cementitious materials or other activators with alkali metal containing activators, e.g. sodium hydroxide or waterglass
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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
Abstract
The invention relates to the technical field of civil engineering materials, in particular to a method for preparing a blast furnace slag modified siliceous stone powder cementing material with different properties by controlling the water loss rate, which is characterized by comprising the following components in percentage by mass: raw materials: 70.38% -73.53%; exciting agent: 26.47 to 29.62 percent of the raw material, wherein the raw material consists of siliceous stone powder and blast furnace slag, the siliceous stone powder accounts for 80 to 95 percent, the blast furnace slag accounts for 5 to 20 percent, the excitant consists of sodium hydroxide, sodium silicate and water, the sodium hydroxide accounts for 16.63 to 28.57 percent, the sodium silicate accounts for 0 to 0.22 percent, and the water accounts for 71.29 to 83.33 percent; the invention provides a method for preparing blast furnace slag modified siliceous stone powder cementing materials with different properties by controlling the water loss rate, which can improve the mechanical properties of the siliceous stone powder cementing materials and reduce the setting time and the shrinkage rate.
Description
Technical Field
The invention relates to the technical field of civil engineering materials, in particular to a method for preparing blast furnace slag modified siliceous stone powder cementing materials with different properties by controlling the water loss rate.
Background
Sandstone is an important raw material in the process of civil construction. Because the wet-process production machine-made sand can cause pollution and waste of a large amount of water resources, the dry-process sand making has become a main mode for making sand by a yellow river basin preparation machine in Gansu, Shaanxi and the like. However, the dry sand making process generates a large amount of stone powder which is generally used as a concrete admixture for secondary utilization, but the siliceous stone powder in the process can reduce the working performance of the concrete and increase the preparation cost. The cement is the traditional cementing material with the largest and the widest dosage in civil engineering construction, but about 0.8 ton of carbon dioxide is generated per 1 ton of cement, and the production of the cement needs to consume a large amount of natural resources such as limestone, clay and the like, while the preparation process of 'two-grinding and one-burning' means that a large amount of energy is consumed for the production of the cement. Therefore, the siliceous stone powder generated in the sand making process is used as a main raw material to prepare the cementing material to replace cement, so that great environmental and economic benefits can be generated.
With the increasing greenhouse effect, alkali-activated cementing materials are researched and developed in many countries, for example, more than 3X 10 is poured in the Soviet Union before 19896m3The alkali-activated concrete of (2) shows the possibility of mass production of the technology (Wang, 1994). However, most of the current alkali-activated cements have been studied mainly for partially or completely replacing cement-made polymer concrete with industrial solid wastes of fly ash, blast furnace slag, metakaolin, etc. or calcined clay (Palomo, 1999; Oh, 2010; Chen, 2015; Li, 2020et al; Zhang Siling, 2021; Yangda, 2021). For example, the invention patent of 'a single-component alkali-activated cementing material using lime-sodium carbonate as an activator' (201810045798.X) is granted, lime and sodium carbonate are used as the activators to activate any one or more of raw materials of blast furnace slag, fly ash, metakaolin, microcrystalline silica fume and volcanic ash, and the prepared alkali-activated cementing material has the highest compression strength of 37.2MPa and the highest rupture strength of 9.88MPa within 28 days. The invention discloses a method for preparing fly ash geopolymer concrete (201910659478.8) by using fly ash and metakaolin as base materials and adopting alkali excitation modeThe compressive strength of the polymer can reach 50MPa at most, and the flexural strength of the polymer can reach 7MPa at most. These materials still belong to cement-based materials and need to be calcined and ground at high temperature, so that the content of amorphous glassy aluminosilicate is higher and the activity is higher. In addition, polymers prepared from industrial solid waste or calcined clay are required to be cured by steam curing or pressure curing in order to obtain high mechanical properties. No matter high-temperature calcination, grinding or subsequent steam curing and pressure curing, a large amount of energy and resources are consumed, and the environmental protection and the economical efficiency of the geopolymer cementing material are reduced. At present, relatively few researches on siliceous natural volcanic ash mainly composed of crystal phases, such as tuff, basalt and the like, are carried out at home and abroad, for example, a method for preparing alkali-activated geopolymer cement by using partial tuff to replace portland cement is adopted in published article' the study on activity of tuff mechanism sand powder in ningbo area (tomb et al, proceedings of ningbo institute of engineering, vol.30, 2 nd, pages 34-38 and 84, 20180630). The invention discloses a tuff-based inorganic environment-friendly cementing material and a preparation method thereof (202010929238.8), and the alkali-activated tuff, blast furnace slag and fly ash are adopted to prepare the composite material, the compressive strength can reach 48MPa in 28 days, and the flexural strength can reach 8 MPa. However, the alkali-activated siliceous stone powder reported at present has one or more of the disadvantages of high raw material treatment cost, poor mechanical properties, long setting time, large shrinkage rate and the like, and the application of the alkali-activated siliceous stone powder in practical engineering is influenced, and the fundamental reason is the lack of a proper maintenance mechanism and the control of water loss rate in maintenance.
In order to fully utilize the collected siliceous stone powder generated in the production process of machine-made sand and develop a novel cementing material with environmental and economic benefits superior to a cement system, the problems of difficult excitation, poor mechanical property, long setting time, large shrinkage rate and the like of the siliceous stone powder cementing material are urgently needed to be solved. Therefore, the invention provides a method for preparing blast furnace slag modified siliceous stone powder cementing materials with different properties by controlling the water loss rate, so as to improve the mechanical properties of the siliceous stone powder cementing materials and reduce the setting time and the shrinkage rate.
Disclosure of Invention
The invention aims to provide a method for preparing a blast furnace slag modified siliceous stone powder cementing material with different properties by controlling the water loss rate, so as to overcome the defects of difficult excitation, poor mechanical property, long coagulation time, large shrinkage rate and the like of siliceous stone powder and promote the large-scale application of the siliceous stone powder in practical engineering.
In order to achieve the purpose, the invention adopts the technical scheme that:
the blast furnace slag modified siliceous stone powder cementing material with different properties prepared by controlling the water loss rate is characterized by comprising the following components in percentage by mass: raw materials: 70.38% -73.53%; exciting agent: 26.47 to 29.62 percent.
Furthermore, the raw material consists of siliceous stone powder and blast furnace slag, wherein the siliceous stone powder accounts for 80-95%, and the blast furnace slag accounts for 5-20%.
Furthermore, the exciting agent consists of 16.63-28.57 percent of sodium hydroxide, 0-0.22 percent of sodium silicate and 71.29-83.33 percent of water.
Further, the specific surface area of the siliceous stone powder and blast furnace slag is not less than 400m2/kg。
Further, the maximum particle size of the powder particles in the siliceous stone powder and the blast furnace slag is not more than 0.2 mm.
Further, Silica (SO) in the siliceous stone powder2) Not less than 60% of aluminum oxide (Al)2O3) The content is not less than 10 percent, and the content of calcium oxide (CaO) is less than 5 percent.
Further, silicon dioxide (SO) in the blast furnace slag2) Aluminum oxide (Al) with content not greater than 40%2O3) The content is not less than 10%, and the content of calcium oxide (CaO) is not less than 30%.
Further, the purity of the sodium hydroxide and the sodium silicate is more than 90%.
A method for preparing blast furnace slag modified siliceous stone powder cementing materials with different properties by controlling the water loss rate comprises the following steps:
step 1: preparation of the exciting agent: the activator is sodium hydroxide (NaOH) solution and sodium silicate (Na)2SiO3) The two solutions are prepared by dissolving solid solute in water, sealing and standing to room temperature;
step 2: preparation of slurry: proportionally mixing blast furnace slag and siliceous stone powder, putting the mixture into a stirrer, uniformly dry-mixing the mixture in the stirrer, pouring sodium hydroxide (NaOH) solution into the stirrer to be mixed with dry materials, fully and uniformly stirring the mixture, stopping stirring, standing the mixture for 10 to 30 minutes, and then adding sodium silicate (Na)2SiO3) Pouring the solution into a stirrer, and continuously stirring uniformly to obtain slurry with good fluidity;
and step 3: preparing and molding a test block: pouring the slurry prepared in the step 2 into a prepared mould, fully oscillating to uniformly discharge bubbles in the slurry, scraping off redundant parts and leveling, sealing the mould to isolate air, placing the sealed mould filled with the slurry in an environment with the temperature of 60-100 ℃ for not less than 1 hour, taking out and demoulding to obtain a siliceous stone powder polymer test block with a required shape;
and 4, step 4: and (3) maintaining the sample: firstly, taking the test block obtained in the step 3, measuring the water loss rate of the test block in an environment of 60-100 ℃ to obtain a water loss curve, and determining the demarcation points a and b of three water loss stages and the corresponding time T1 and T2 according to the water loss curve; then, the user can use the device to perform the operation,
if the test block in the step 3 is directly placed in a ventilated heat-preservation box at the temperature of 60-100 ℃, the test block with the compressive strength not lower than 40MPa can be obtained after 14 days;
if the test block in the step 3 is placed in a ventilated heat-preservation box at the temperature of 60-100 ℃ for maintenance, the test block is taken out after T1 time, the test block is sealed and then placed in the ventilated heat-preservation box at the temperature of 60-100 ℃ for continuous maintenance, and the test block with the compressive strength not lower than 80MPa can be obtained after 14 days;
and (3) if the test block in the step (3) is placed in a 60-100 ℃ ventilation and heat preservation box, taking out the test block after T2 time, sealing the test block, placing the sealed test block in the 60-100 ℃ ventilation and heat preservation box for continuous maintenance, and obtaining the test block with the compressive strength not lower than 60MPa after 14 days.
Further, in step 1The concentration of the sodium hydroxide (NaOH) solution is 2.5 mol/L-10 mol/L, and the sodium silicate (Na)2SiO3) The concentration of the solution is not more than 2 mol/L.
The invention has the following beneficial effects:
drawings
FIG. 1 is a graph showing the water loss profile of a silica stone powder-based cementitious material according to the present invention;
FIG. 2 is an SEM image of tuff powder particles of the invention;
FIG. 3 is a graph of the compressive stress strain relationship of the cement of the present invention;
FIG. 4 is a graph showing the relationship between flexural stress and strain of the gelled material of the invention;
FIG. 5 is a graph showing shrinkage of the 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 specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example 1
The blast furnace slag modified siliceous stone powder cementing material with different properties prepared by controlling the water loss rate is characterized by comprising the following components in percentage by mass: raw materials: 70.38% -73.53%; exciting agent: 26.47 to 29.62 percent.
Furthermore, the raw material consists of siliceous stone powder and blast furnace slag, wherein the siliceous stone powder accounts for 80-95%, and the blast furnace slag accounts for 5-20%.
Furthermore, the exciting agent consists of 16.63-28.57 percent of sodium hydroxide, 0-0.22 percent of sodium silicate and 71.29-83.33 percent of water.
Further, the specific surface area of the siliceous stone powder and blast furnace slag is not less than 400m2/kg。
Further, the maximum particle size of the powder particles in the siliceous stone powder and the blast furnace slag is not more than 0.2 mm.
Further onSilica (SO) in the siliceous stone powder2) Not less than 60% of aluminum oxide (Al)2O3) The content is not less than 10 percent, and the content of calcium oxide (CaO) is less than 5 percent.
Further, silicon dioxide (SO) in the blast furnace slag2) Aluminum oxide (Al) with content not greater than 40%2O3) The content is not less than 10%, and the content of calcium oxide (CaO) is not less than 30%.
Further, the purity of the sodium hydroxide and the sodium silicate is more than 90%.
A method for preparing blast furnace slag modified siliceous stone powder cementing materials with different properties by controlling the water loss rate comprises the following steps:
step 1: preparation of the exciting agent: the activator is sodium hydroxide (NaOH) solution and sodium silicate (Na)2SiO3) The two solutions are prepared by dissolving solid solute in water, sealing and standing to room temperature;
step 2: preparation of slurry: proportionally mixing blast furnace slag and siliceous stone powder, putting the mixture into a stirrer, uniformly dry-mixing the mixture in the stirrer, pouring sodium hydroxide (NaOH) solution into the stirrer to be mixed with dry materials, fully and uniformly stirring the mixture, stopping stirring, standing the mixture for 10 to 30 minutes, and then adding sodium silicate (Na)2SiO3) Pouring the solution into a stirrer, and continuously stirring uniformly to obtain slurry with good fluidity;
and step 3: preparing and molding a test block: pouring the slurry prepared in the step 2 into a prepared mould, fully oscillating to uniformly discharge bubbles in the slurry, scraping off redundant parts and leveling, sealing the mould to isolate air, placing the sealed mould filled with the slurry in an environment with the temperature of 60-100 ℃ for not less than 1 hour, taking out and demoulding to obtain a siliceous stone powder polymer test block with a required shape;
and 4, step 4: and (3) maintaining the sample: firstly, taking the test block obtained in the step 3, measuring the water loss rate of the test block in the environment of 60-100 ℃ to obtain a water loss curve shown as a legend in a figure 1, and determining boundary points a and b of three water loss stages and corresponding time T1 and T2 according to the water loss curve; then, the user can use the device to perform the operation,
if the test block in the step 3 is directly placed in a ventilated heat-preservation box at the temperature of 60-100 ℃, the test block with the compressive strength not lower than 40MPa can be obtained after 14 days;
if the test block in the step 3 is placed in a ventilated heat-preservation box at the temperature of 60-100 ℃ for maintenance, the test block is taken out after T1 time, the test block is sealed and then placed in the ventilated heat-preservation box at the temperature of 60-100 ℃ for continuous maintenance, and the test block with the compressive strength not lower than 80MPa can be obtained after 14 days;
and (3) if the test block in the step (3) is placed in a 60-100 ℃ ventilation and heat preservation box, taking out the test block after T2 time, sealing the test block, placing the sealed test block in the 60-100 ℃ ventilation and heat preservation box for continuous maintenance, and obtaining the test block with the compressive strength not lower than 60MPa after 14 days.
Further, in step 1, the concentration of the sodium hydroxide (NaOH) solution is 2.5mol/L to 10mol/L, and the sodium silicate (Na)2SiO3) The concentration of the solution is not more than 2 mol/L.
Example 2
A method for preparing blast furnace slag modified siliceous stone powder cementing materials with different properties by controlling the water loss rate comprises the following steps:
step (1): taking siliceous stone powder collected in the production process of blast furnace slag and machine-made sand to perform chemical component analysis (XRF test), and the results are shown in Table 1;
table 1 XRF analysis results of raw materials
Step (2): putting 450g of siliceous stone powder and 50g of blast furnace slag into a stirrer, uniformly mixing, then pouring 150ml of sodium hydroxide solution with the concentration of 7.5mol/L into the dry-mixed siliceous stone powder and the blast furnace slag, stirring uniformly, stopping stirring for 20 minutes, then pouring 20ml of sodium silicate solution with the concentration of 1.5mol/L, and continuously stirring uniformly to obtain slurry;
and (3): pouring the slurry prepared in the step (2) into a prepared silica gel mold of 2cm multiplied by 2cm, fully oscillating and uniformly discharging air bubbles in the slurry, scraping off redundant parts and leveling, sealing the mold to isolate air, placing the sealed mold filled with the slurry in an environment of 60 ℃ for 1 hour, taking out and demolding to obtain a siliceous stone powder test block in a required shape;
and (4): taking the test block obtained in the step (3), measuring the water loss rate of the test block in the environment of 60 ℃ to obtain a water loss curve shown as a legend in figure 1, and determining boundary points a and b of three water loss stages and corresponding time T1 and T2 according to the water loss curve; then, putting the rest test blocks into a 60 ℃ ventilation and heat preservation box, taking out the test blocks after T2 time, sealing the test blocks, and putting the sealed test blocks into the 60 ℃ ventilation and heat preservation box for continuous maintenance for 14 days;
and (5): taking the test block obtained in the step (4), and measuring the compressive strength and the flexural strength, wherein the test results are shown in fig. 3 and 4;
and (6): the test piece obtained in step (4) was taken out and the shrinkage was measured, and the test results are shown in fig. 5.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. 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 (10)
1. The blast furnace slag modified siliceous stone powder cementing material with different properties prepared by controlling the water loss rate is characterized by comprising the following components in percentage by mass: raw materials: 70.38% -73.53%; exciting agent: 26.47 to 29.62 percent.
2. The blast furnace slag modified siliceous stone powder binding material with different properties prepared by controlling the water loss rate according to claim 1, wherein: the raw material consists of siliceous stone powder and blast furnace slag, wherein the siliceous stone powder accounts for 80-95 percent, and the blast furnace slag accounts for 5-20 percent.
3. The blast furnace slag modified siliceous stone powder binding material with different properties prepared by controlling the water loss rate according to claim 1, wherein: the excitant consists of 16.63-28.57% of sodium hydroxide, 0-0.22% of sodium silicate and 71.29-83.33% of water.
4. The blast furnace slag modified siliceous stone powder binding material with different properties prepared by controlling the water loss rate according to claim 2, wherein: the specific surface area of the siliceous stone powder and blast furnace slag is not less than 400m2/kg。
5. The blast furnace slag modified siliceous stone powder binding material with different properties prepared by controlling the water loss rate according to claim 2, wherein: the maximum particle size of the powder particles in the siliceous stone powder and the blast furnace slag is not more than 0.2 mm.
6. The blast furnace slag modified siliceous stone powder binding material with different properties prepared by controlling the water loss rate according to claim 2, wherein: silica (SO) in the siliceous stone powder2) Not less than 60% of aluminum oxide (Al)2O3) The content is not less than 10 percent, and the content of calcium oxide (CaO) is less than 5 percent.
7. The blast furnace slag modified siliceous stone powder binding material with different properties prepared by controlling the water loss rate according to claim 2, wherein: silicon dioxide (SO) in the blast furnace slag2) Aluminum oxide (Al) with content not greater than 40%2O3) The content is not less than 10%, and the content of calcium oxide (CaO) is not less than 30%.
8. The blast furnace slag modified siliceous stone powder binding material with different properties prepared by controlling the water loss rate according to claim 3, wherein: the purity of the sodium hydroxide and the sodium silicate is more than 90%.
9. A method for preparing blast furnace slag modified siliceous stone powder cementing materials with different properties by controlling the water loss rate comprises the following steps:
step 1: preparation of the exciting agent: the activator is sodium hydroxide (NaOH) solution and sodium silicate (Na)2SiO3) The two solutions are prepared by dissolving solid solute in water, sealing and standing to room temperature;
step 2: preparation of slurry: proportionally mixing blast furnace slag and siliceous stone powder, putting the mixture into a stirrer, uniformly dry-mixing the mixture in the stirrer, pouring sodium hydroxide (NaOH) solution into the stirrer to be mixed with dry materials, fully and uniformly stirring the mixture, stopping stirring, standing the mixture for 10 to 30 minutes, and then adding sodium silicate (Na)2SiO3) Pouring the solution into a stirrer, and continuously stirring uniformly to obtain slurry with good fluidity;
and step 3: preparing and molding a test block: pouring the slurry prepared in the step 2 into a prepared mould, fully oscillating to uniformly discharge bubbles in the slurry, scraping off redundant parts and leveling, sealing the mould to isolate air, placing the sealed mould filled with the slurry in an environment with the temperature of 60-100 ℃ for not less than 1 hour, taking out and demoulding to obtain a siliceous stone powder polymer test block with a required shape;
and 4, step 4: and (3) maintaining the sample: firstly, taking the test block obtained in the step 3, measuring the water loss rate of the test block in an environment of 60-100 ℃ to obtain a water loss curve, and determining the demarcation points a and b of three water loss stages and the corresponding time T1 and T2 according to the water loss curve; then, the user can use the device to perform the operation,
if the test block in the step 3 is directly placed in a ventilated heat-preservation box at the temperature of 60-100 ℃, the test block with the compressive strength not lower than 40MPa can be obtained after 14 days;
if the test block in the step 3 is placed in a ventilated heat-preservation box at the temperature of 60-100 ℃ for maintenance, the test block is taken out after T1 time, the test block is sealed and then placed in the ventilated heat-preservation box at the temperature of 60-100 ℃ for continuous maintenance, and the test block with the compressive strength not lower than 80MPa can be obtained after 14 days;
and (3) if the test block in the step (3) is placed in a 60-100 ℃ ventilation and heat preservation box, taking out the test block after T2 time, sealing the test block, placing the sealed test block in the 60-100 ℃ ventilation and heat preservation box for continuous maintenance, and obtaining the test block with the compressive strength not lower than 60MPa after 14 days.
10. The method for preparing the blast furnace slag modified siliceous stone powder cementing material with different properties by controlling the water loss rate according to claim 9, wherein the method comprises the following steps: in step 1, the concentration of the sodium hydroxide (NaOH) solution is 2.5 mol/L-10 mol/L, and the sodium silicate (Na)2SiO3) The concentration of the solution is not more than 2 mol/L.
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| 崔科旺等: "矿粉掺量对碱激发凝灰岩胶凝材料性能的影响", 《建材世界》 * |
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|---|---|
| CN114031317B (en) | 2022-10-11 |
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