CN111439948B - Retarder, alkali-activated slag-fly ash mortar and cementing material thereof - Google Patents
Retarder, alkali-activated slag-fly ash mortar and cementing material thereof Download PDFInfo
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- CN111439948B CN111439948B CN202010144926.3A CN202010144926A CN111439948B CN 111439948 B CN111439948 B CN 111439948B CN 202010144926 A CN202010144926 A CN 202010144926A CN 111439948 B CN111439948 B CN 111439948B
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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
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
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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
- C04B28/24—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 alkyl, ammonium or metal silicates; containing silica sols
- C04B28/26—Silicates of the alkali metals
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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
- C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
- C04B2103/20—Retarders
- C04B2103/22—Set retarders
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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
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention relates to a building material additive, and discloses a retarder, which comprises 40-100 wt% of alkali metal salt and 0-60 wt% of alkaline earth metal salt based on the total weight of the retarder; wherein the alkali metal salt is selected from one or more of sodium carbonate, sodium phosphate and sodium borate; the alkaline earth metal salt is selected from one or more of barium chloride, calcium nitrate and barium borate. The invention also discloses alkali-activated slag-fly ash mortar for preparing the alkali-activated slag-fly ash-based cementing material and the alkali-activated slag-fly ash-based cementing material obtained from the alkali-activated slag-fly ash mortar. The retarder can slow down the coagulation of the gel material, can ensure the strength and durability of the gel material, has low price of raw materials, can be prepared at present, and is suitable for being used in large quantities on site.
Description
Technical Field
The invention relates to a building material additive, in particular to a retarder, alkali-activated slag-fly ash mortar and a cementing material thereof.
Background
Cement plays a very important role in global infrastructure as a common building material. The production of cement consumes a large amount of natural resources (such as limestone, clay and the like) and energy, and discharges a large amount of greenhouse gases, which increases the greenhouse effect of the earth and influences the living environment of the earth. Currently, various countries in the world are constantly striving to find ways to improve cement production to reduce energy consumption and greenhouse gas emissions. However, it has been found that this effect is not significant, since the energy saving techniques of cement production have almost come to the end of theory (extreme). Finding a sustainable alternative to cement for cementitious materials is currently considered the most effective technical approach to solve the above problems.
The alkali-activated cementing material has the following characteristics: on one hand, the solid waste discharged by other industries can be effectively utilized, and on the other hand, the defects of the Portland cement in certain properties (such as high temperature resistance and sulfate corrosion resistance) can be made up so as to meet the requirements of certain engineering fields. The alkali-activated cementing material is expected to become a substitute material for cement in various engineering fields by virtue of the advantages of low carbon emission, reasonable utilization of industrial solid wastes, equivalent or even better performance and the like, and is a focus of extensive researchers at present. However, the development of alkali-activated cements also faces some technical difficulties: the alkali-activated reaction of the slag has the characteristic of rapid setting, the initial setting time of the slag is generally 10-30min, the initial setting time of the cementing material which does not meet the conventional requirement of the cement industry is more than or equal to 45min, and the large-scale engineering application of the slag is hindered.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a retarder, alkali-activated slag-fly ash mortar and alkali-activated slag-fly ash-based cementing material, wherein the retarder can slow down the coagulation of a gel material, can ensure the strength and durability of the gel material, has low price of raw materials, can be prepared and used at present, and is suitable for large-scale field use.
In order to achieve the above object, the present invention provides in a first aspect a retarder comprising 40 to 100% by weight of an alkali metal salt and 0 to 60% by weight of an alkaline earth metal salt, based on the total weight of the retarder;
wherein the alkali metal salt is selected from one or more of sodium carbonate, sodium phosphate and sodium borate; the alkaline earth metal salt is selected from one or more of barium chloride, calcium nitrate and barium borate.
Preferably, the retarder contains 40-99 wt% of an alkali metal salt and 1-60 wt% of an alkaline earth metal salt, based on the total weight of the retarder.
Preferably, the retarder contains 40-70 wt% of alkali metal salt, 5-25 wt% of alkaline earth metal salt and 25-35 wt% of polyalcohol type shrinkage reducing agent and/or polyether type shrinkage reducing agent based on the total weight of the retarder.
In a second aspect, the present invention provides an alkali-activated slag-fly ash mortar for preparing an alkali-activated slag-fly ash-based cementitious material, the cementitious material containing, in weight percent, 15% to 30% of slag and 70% to 85% of fly ash;
in addition, the gel material also contains 3 to 8 percent of alkaline activator, 4 to 8 percent of retarder and 26 to 50 percent of water based on the total weight of the slag and the fly ash;
wherein the retarder is the retarder of the invention.
Preferably, the particle size of the slag is 1-45 μm, and the particle size of the fly ash is 1-100 μm.
Preferably, the alkali-activator is a mixture of an alkali and an alkali metal silicate;
the alkali is sodium hydroxide and/or potassium hydroxide, and the alkali metal silicate is sodium silicate and/or potassium silicate.
Further preferably, the mass ratio of the alkali to the alkali silicate is 1: 0.5-3.
Further preferably, the gel material further contains aggregate 160-200% of the total weight of the above slag and fly ash.
In a third aspect, the invention provides an alkali-activated slag-fly ash-based cementing material, which is obtained by curing and maintaining the alkali-activated slag-fly ash mortar.
Preferably, the method for preparing the alkali-activated slag-fly ash mortar comprises:
(1) respectively providing an alkaline excitant aqueous solution and a retarder aqueous solution;
dissolving an alkaline activator in water, sealing and standing for 12-48h to obtain an alkaline activator aqueous solution;
dissolving a retarder in water to obtain a retarder water solution;
(2) and (2) uniformly mixing the alkaline excitant aqueous solution, the retarder aqueous solution, the slag, the fly ash and the selectively added aggregate in the step (1) to obtain the alkaline excitant slag-fly ash mortar.
Through the technical scheme, the invention has the beneficial effects that:
1. the retarder provided by the invention can effectively prolong the gelation time of the alkali-activated slag-fly ash cementing material, the gelation time of the alkali-activated slag-fly ash cementing material can be adjusted within 1-12h by changing the addition amount, and the strength and hardness of the alkali-activated slag-fly ash cementing material can be ensured and even enhanced.
2. The retarder provided by the invention can delay the condensation of the alkali-activated slag-fly ash cementing material, simultaneously reduce the shrinkage of the alkali-activated slag-fly ash cementing material, prevent the surface from cracking due to large shrinkage, and is not beneficial to the practical application of the alkali-activated slag-fly ash cementing material.
3. The retarder provided by the invention can not obviously reduce the fluidity of the freshly mixed mortar, and even can improve the fluidity of the freshly mixed mortar, and the fluidity of the freshly mixed mortar meets the requirement, so that the retarder is beneficial to normal construction.
4. The retarder provided by the invention can be prepared and used at the moment, is simple to operate, has cheap raw materials, and is suitable for large-scale field use.
5. The alkali-activated slag-fly ash-based cementing material provided by the invention utilizes slag and fly ash industrial solid wastes as test raw materials, thereby not only solving the problem of land resource waste and pollution caused by long-term accumulation of slag (partial areas), fly ash and other industrial solid wastes, but also reducing the consumption of portland cement, reducing the energy consumption and environmental problems caused by cement production, and meeting the requirements of energy conservation, emission reduction and green low-carbon sustainable development.
Detailed Description
The endpoints of the ranges and any values disclosed herein are not limited to the precise range or value, and such ranges or values should be understood to encompass values close to those ranges or values. For ranges of values, between the endpoints of each of the ranges and the individual points, and between the individual points may be combined with each other to give one or more new ranges of values, and these ranges of values should be considered as specifically disclosed herein.
In a first aspect, the present invention provides a retarder comprising 40 to 100 wt% of an alkali metal salt and 0 to 60 wt% of an alkaline earth metal salt, based on the total weight of the retarder; preferably, the retarder contains 40-99 wt% of an alkali metal salt and 1-60 wt% of an alkaline earth metal salt, based on the total weight of the retarder;
wherein the alkali metal salt is selected from one or more of sodium carbonate, sodium phosphate and sodium borate; the alkaline earth metal salt is selected from one or more of barium chloride, calcium nitrate and barium borate.
Specifically, when a plurality of alkali metal salts and one or more alkaline earth metal salts are selected, the plurality of alkali metal salts or the plurality of alkaline earth metal salts may be mixed in any mass ratio, which is not limited herein. The mixing ratio employed in the specific embodiment of the present invention is 1: 1.
Furthermore, in order to improve the retardation effect, the strength and the hardness of the retarder, the retarder contains 40-99 wt% of alkali metal salt and 1-60 wt% of alkaline earth metal salt based on the total weight of the retarder.
Further, in order to further prevent the alkali-activated slag-fly ash gelled material from shrinking during the setting process to cause surface cracking, which affects the practical application of the alkali-activated slag-fly ash based gelled material, the retarder contains 40-70 wt% of an alkali metal salt, 5-25 wt% of an alkaline earth metal salt, and 25-35 wt% of a polyalcohol type shrinkage reducing agent and a-or polyether type shrinkage reducing agent, based on the total weight of the retarder. The types of said polyol type shrinkage reducing agents and said polyether type shrinkage reducing agents are well known to those skilled in the art, and are either commercially available or prepared according to methods well known in the art. When the polyol type reducing agent and the polyether type reducing agent are added simultaneously, or when a plurality of polyol type reducing agents or polyether type reducing agents are added simultaneously, the polyol type reducing agent and/or the polyether type reducing agent to be added in a mixed manner may be mixed at an arbitrary mass ratio, and is not limited herein.
In a second aspect, the invention provides an alkali-activated slag-fly ash mortar for preparing an alkali-activated slag-fly ash-based cementitious material, the cementitious material containing, in weight percent, 15% to 30% slag and 70% to 85% fly ash;
in addition, the gel material also contains 3 to 8 percent of alkaline activator, 4 to 8 percent of retarder and 26 to 50 percent of water based on the total weight of the slag and the fly ash;
wherein the retarder is the retarder of the invention.
Preferably, the slag has a particle size of 1-45 μm and the fly ash has a particle size of 1-100 μm to ensure more uniform mixing of the components. More preferably, the slag has a particle size of 15 to 35 μm, and the fly ash has a particle size of 30 to 45 μm.
Specifically, the alkali activator is preferably a mixture of alkali and alkali metal silicate; the base may be an inorganic base conventionally used in the art, such as sodium hydroxide and/or potassium hydroxide, and the alkali metal silicate is preferably sodium silicate and/or potassium silicate. Although the ratio of alkali to alkali metal silicate can be selected within a wide range, it is preferred that the ratio of the alkali to the alkali metal silicate is 1:0.5 to 3 by mass in order to achieve the object of the present invention better. The sodium or potassium silicate had an original modulus of 3.3.
Specifically, the gel material also contains aggregate which accounts for 160-200% of the total weight of the slag and the fly ash. The aggregate may be an aggregate conventionally used in the art, for example, the aggregate includes stones, such as crushed stones, pebbles, and crushed pebbles, and sands, such as river sands, mountain sands, and sea sands. According to an embodiment of the present invention, the aggregate is preferably selected from one or more of river sand, mountain sand, and sea sand.
In a third aspect, the invention also provides an alkali-activated slag-fly ash-based cementing material, which is obtained by curing and maintaining the alkali-activated slag-fly ash mortar.
Specifically, the alkali-activated slag-fly ash mortar is injected into a mold, and is solidified, demoulded and maintained to obtain the alkali-activated slag-fly ash-based cementing material. The solidification, demolding and maintenance are carried out by adopting a conventional technical means, namely, the alkali-activated slag-fly ash mortar is injected into a mold, and demolding is carried out after the alkali-activated slag-fly ash mortar is solidified. The curing conditions comprise that the curing temperature is generally 18-25 ℃, and the curing time is generally 18-36 h; the curing time is generally 25-30 days, in the embodiment of the invention 28 days, and the curing temperature is normal temperature, for example 18-22 ℃.
Preferably, the method for preparing the alkali-activated slag-fly ash mortar comprises:
(1) respectively providing an alkaline excitant aqueous solution and a retarder aqueous solution;
dissolving an alkaline activator in water, sealing and standing for 12-48h to obtain an alkaline activator aqueous solution;
dissolving a retarder in water to obtain a retarder water solution;
(2) and (2) uniformly mixing the alkaline excitant aqueous solution, the retarder aqueous solution, the slag, the fly ash and the selectively added aggregate in the step (1) to obtain the alkaline excitant slag-fly ash mortar.
Specifically, in the step (1), the concentration of the aqueous solution of the alkali-activating agent is not particularly limited, and the amount of water is generally used so as to ensure that the concentration thereof is 20 to 50% by mass. The concentration of the retarder water solution is not particularly limited, and the mass percentage concentration of the retarder water solution is 20-40% guaranteed by the using amount of common water.
In the step (2), the mixing manner of the alkaline activator aqueous solution and the retarder aqueous solution with the slag, the fly ash and the selectively added aggregate is not particularly limited, and the mixing sequence has no particular influence on the performance of the obtained material. Preferably, in order to mix more uniformly, the slag and the fly ash may be mixed uniformly, then the aggregate is selectively added and stirred uniformly to obtain a mixed solid, and then the alkaline activator aqueous solution and the retarder aqueous solution are mixed uniformly with the mixed solid. The mixing mode can adopt mechanical mixing or manual mixing, preferably adopts mechanical mixing, can make the mixed solid obtained after the mixing more even and can reduce the human cost.
According to the preparation method of the alkali-activated slag-fly ash mortar, the dosage of each substance is only required to ensure that the alkali-activated slag-fly ash mortar for preparing the alkali-activated slag-fly ash-based cementing material can be obtained.
The present invention will be described in detail below by way of examples. In the following examples, fluidity was measured by the Cement mortar fluidity test method (GB/T2419-2005); the compressive strength is tested according to the cement mortar strength test method (GB/T17671-1999); the setting time is tested according to the building mortar basic performance test method standard (JGJ/T70-2009); shrinkage was measured according to Cement mortar Dry shrinkage test method (JC/T603-2004). Potassium silicate, sodium silicate, NaOH, KOH, sodium borate, barium chloride, sodium phosphate, barium borate, sodium carbonate and calcium nitrate are all analytical pure medicines purchased from the national medicine group; polyol shrinkage reducing agents were purchased from german minnow; polyether shrinkage reducing agents are purchased from Subot; the slag and fly ash were purchased from a concrete supplier in the local area of salt city, Jiangsu, China.
Example 1
(1) Preparing a potassium silicate solution with the modulus of 3.3 and the mass percent of 34 percent, mixing 0.8kg of potassium hydroxide with 4.71kg of the potassium silicate hydrate solution, adding 6.76kg of water, stirring uniformly to obtain an alkali excitation solution, sealing and standing for 24 hours for use.
(2) 1.28kg of sodium borate, 0.31kg of barium chloride and 0.81kg of polyol shrinkage reducer were dissolved in 6kg of water to prepare an aqueous retarder solution.
(3) Adding 8kg of slag with the particle size of 25 mu m and 32kg of fly ash with the particle size of 35 mu m into a stirrer, adding 72kg of sand after uniformly stirring, uniformly mixing, adding the alkali-activated solution and the retarder water solution, and uniformly stirring to form the alkali-activated slag-fly ash mortar.
(4) And (3) injecting the alkali-activated slag-fly ash mortar into a mould, curing, demoulding and curing at normal temperature for 28 days to obtain the alkali-activated slag-fly ash-based cementing material. During this process, the alkali-activated slag-fly ash mortar initial setting time, final setting time, fluidity, 28-day compressive strength, 28-day hardness, and 28-day shrinkage were recorded.
Example 2
(1) Preparing a sodium silicate solution with the modulus of 3.3 and the mass percent of 34%, mixing 0.54kg of sodium hydroxide and 1.93kg of the sodium silicate hydrate solution, adding 7.6kg of water, stirring uniformly to obtain an alkali excitation solution, sealing and standing for 12 hours for use.
(2) 1.22kg of sodium phosphate, 0.09kg of an alkaline earth metal salt (the mixing mass ratio of barium borate to calcium nitrate is 1:1) and 0.44kg of a shrinkage reducing agent (the mass ratio of polyol to polyether shrinkage reducing agent is 1:1) were dissolved in 5kg of water to prepare an aqueous retarder solution.
(3) 12kg of slag with the particle size of 15 mu m and 28kg of fly ash with the particle size of 30 mu m are added into a stirrer, 64kg of river sand is added after uniform stirring, the mixture is uniformly mixed, the alkali-activated solution and the retarder water solution are added, and the alkali-activated slag-fly ash mortar is formed after uniform stirring.
(4) And (3) injecting the alkali-activated slag-fly ash mortar into a mould, curing, demoulding and curing at normal temperature for 28 days to obtain the alkali-activated slag-fly ash-based cementing material. During this process, the alkali-activated slag-fly ash mortar initial setting time, final setting time, fluidity, 28-day compressive strength, 28-day hardness, and 28-day shrinkage were recorded.
Example 3
(1) Preparing a sodium silicate solution with the modulus of 3.3 and the mass percent of 34%, mixing 2kg of sodium hydroxide and 5.9kg of the sodium silicate hydrate solution, adding 6.26kg of water, stirring uniformly to obtain an alkali-activated solution, sealing and standing for 48 hours for use.
(2) 1.28kg of an alkali metal salt (sodium carbonate/sodium borate mass ratio: 1), 0.8kg of calcium nitrate and 1.12kg of a polyether shrinkage reducing agent were dissolved in 5.4kg of water to prepare an aqueous retarder solution.
(3) 6kg of slag with the particle size of 35 mu m and 34kg of fly ash with the particle size of 45 mu m are added into a stirrer, 80kg of sea sand is added after uniform stirring, the mixture is uniformly mixed, the alkali-activated solution and the retarder water solution are added, and the alkali-activated slag-fly ash mortar is formed after uniform stirring.
(4) And (3) injecting the alkali-activated slag-fly ash mortar into a mould, curing, demoulding and curing at normal temperature for 28 days to obtain the alkali-activated slag-fly ash-based cementing material. During this process, the alkali-activated slag-fly ash mortar initial setting time, final setting time, fluidity, 28-day compressive strength, 28-day hardness, and 28-day shrinkage were recorded.
Example 4
(1) Preparing a sodium silicate solution with the modulus of 3.3 and the mass percent of 34%, mixing 2kg of sodium hydroxide and 5.9kg of the sodium silicate hydrate solution, adding 8.78kg of water, stirring uniformly to obtain an alkali-activated solution, sealing and standing for 48 hours for use.
(2) 1.92kg of an alkali metal salt (sodium carbonate and sodium borate in a mass ratio of 1:1) and 0.48kg of calcium nitrate were dissolved in 6.88kg of water to prepare an aqueous retarder solution.
(3) 6kg of slag with the particle size of 35 mu m and 34kg of fly ash with the particle size of 45 mu m are added into a stirrer, 80kg of sea sand is added after uniform stirring, the mixture is uniformly mixed, the alkali-activated solution and the retarder water solution are added, and the alkali-activated slag-fly ash mortar is formed after uniform stirring.
(4) And (3) injecting the alkali-activated slag-fly ash mortar into a mould, curing, demoulding and curing at normal temperature for 28 days to obtain the alkali-activated slag-fly ash-based cementing material. During this process, the alkali-activated slag-fly ash mortar initial setting time, final setting time, fluidity, 28-day compressive strength, 28-day hardness, and 28-day shrinkage were recorded.
Example 5
(1) Preparing a sodium silicate solution with the modulus of 3.3 and the mass percent of 34%, mixing 0.54kg of sodium hydroxide and 1.93kg of the sodium silicate hydrate solution, adding 7.6kg of water, stirring uniformly to obtain an alkali excitation solution, sealing and standing for 12 hours for use.
(2) 0.64kg of sodium phosphate and 0.96kg of an alkaline earth metal salt (the mixing mass ratio of barium borate to calcium nitrate is 1:1) were dissolved in 8.2kg of water to prepare an aqueous retarder solution.
(3) Adding 8kg of slag with the particle size of 15 microns and 32kg of fly ash with the particle size of 30 microns into a stirrer, uniformly stirring, adding 80kg of river sand, uniformly mixing, adding the alkali-activated solution and the retarder water solution, and uniformly stirring to form the alkali-activated slag-fly ash mortar.
(4) And (3) injecting the alkali-activated slag-fly ash mortar into a mould, curing, demoulding and curing at normal temperature for 28 days to obtain the alkali-activated slag-fly ash-based cementing material. During this process, the alkali-activated slag-fly ash mortar initial setting time, final setting time, fluidity, 28-day compressive strength, 28-day hardness, and 28-day shrinkage were recorded.
Example 6
(1) Preparing a potassium silicate solution with the modulus of 3.3 and the mass percent of 34 percent, mixing 0.8kg of potassium hydroxide with 4.71kg of the potassium silicate hydrate solution, adding 8.8kg of water, stirring uniformly to obtain an alkali excitation solution, sealing and standing for 24 hours for use.
(2) 3.17kg of sodium phosphate and 0.03kg of barium borate were dissolved in 6.86kg of water to prepare an aqueous retarder solution.
(3) Adding 12kg of 25 mu m slag and 28kg of 35 mu m fly ash into a stirrer, uniformly stirring, adding 64kg of aggregate, uniformly stirring, adding 72kg of mountain sand, uniformly mixing, adding the alkali-activated solution and the retarder water solution, and uniformly stirring to form the alkali-activated slag-fly ash mortar.
(4) And (3) injecting the alkali-activated slag-fly ash mortar into a mould, curing, demoulding and curing at normal temperature for 28 days to obtain the alkali-activated slag-fly ash-based cementing material. During this process, the alkali-activated slag-fly ash mortar initial setting time, final setting time, fluidity, 28-day compressive strength, 28-day hardness, and 28-day shrinkage were recorded.
Example 7
(1) Preparing a potassium silicate solution with the modulus of 3.3 and the mass percent of 34 percent, mixing 0.8kg of potassium hydroxide with 4.71kg of the potassium silicate hydrate solution, adding 8.5kg of water, stirring uniformly to obtain an alkali excitation solution, sealing and standing for 24 hours for use.
(2) 3.2kg of sodium phosphate was dissolved in 7.1kg of water to prepare an aqueous retarder solution.
(3) Adding 12kg of 25 mu m slag and 28kg of 35 mu m fly ash into a stirrer, uniformly stirring, adding 64kg of aggregate, uniformly stirring, adding 72kg of mountain sand, uniformly mixing, adding the alkali-activated solution and the retarder water solution, and uniformly stirring to form the alkali-activated slag-fly ash mortar.
(4) And (3) injecting the alkali-activated slag-fly ash mortar into a mould, curing, demoulding and curing at normal temperature for 28 days to obtain the alkali-activated slag-fly ash-based cementing material. During this process, the alkali-activated slag-fly ash mortar initial setting time, final setting time, fluidity, 28-day compressive strength, 28-day hardness, and 28-day shrinkage were recorded.
Comparative example 1
The difference from example 5 is that: in the step (2), 0.36kg of zinc sulfate and 2.04kg of alkaline earth metal salt (the mixing mass ratio of barium borate to calcium nitrate is 1:1) are dissolved in 8.5kg of water to prepare a retarder aqueous solution.
Comparative example 2
The difference from example 1 is that: no retarder was added.
The data detected in examples 1 to 7 and comparative examples 1 to 2 above are shown in the following table:
the preferred embodiments of the present invention have been described above in detail, but the present invention is not limited thereto. Within the scope of the technical idea of the invention, many simple modifications can be made to the technical solution of the invention, including combinations of various technical features in any other suitable way, and these simple modifications and combinations should also be regarded as the disclosure of the invention, and all fall within the scope of the invention.
Claims (7)
1. An alkali-activated slag-fly ash mortar for preparing an alkali-activated slag-fly ash-based cementitious material, characterized by comprising 15-30% of slag and 70-85% of fly ash in percentage by weight;
in addition, the slag-fly ash concrete also comprises 3-8% of alkaline excitant, 4-8% of retarder and 26-50% of water, wherein the alkaline excitant accounts for the total weight of the slag and the fly ash;
wherein the retarder contains 40-99 wt% of alkali metal salt and 1-60 wt% of alkaline earth metal salt based on the total weight of the retarder, and the alkali metal salt is selected from one or more of sodium carbonate, sodium phosphate and sodium borate; the alkaline earth metal salt is selected from one or more of barium chloride, calcium nitrate and barium borate;
the preparation method of the alkali-activated slag-fly ash mortar comprises the following steps:
(1) respectively providing an alkaline excitant aqueous solution and a retarder aqueous solution;
dissolving an alkaline activator in water, sealing and standing for 12-48h to obtain an alkaline activator aqueous solution;
dissolving a retarder in water to obtain a retarder water solution;
(2) and (2) uniformly mixing the alkaline activator aqueous solution, the retarder aqueous solution and the residual solid raw materials in the step (1) to obtain the alkaline-activated slag-fly ash mortar.
2. The alkali-activated slag-fly ash mortar for producing an alkali-activated slag-fly ash-based cementitious material according to claim 1, wherein the retarder contains 40 to 70% by weight of an alkali metal salt, 5 to 25% by weight of an alkaline earth metal salt, and 25 to 35% by weight of a polyol-based shrinkage reducing agent and/or polyether-based shrinkage reducing agent, based on the total weight of the retarder.
3. The alkali-activated slag-fly ash mortar for producing an alkali-activated slag-fly ash-based cementitious material according to claim 1 or 2, wherein the slag has a particle size of 1 to 45 μm and the fly ash has a particle size of 1 to 100 μm.
4. The alkali-activated slag-fly ash mortar for producing an alkali-activated slag-fly ash-based cementitious material according to claim 1 or 2, wherein the alkali activator is a mixture of alkali and alkali metal silicate;
the alkali is sodium hydroxide and/or potassium hydroxide, and the alkali metal silicate is sodium silicate and/or potassium silicate.
5. The alkali-activated slag-fly ash mortar for producing an alkali-activated slag-fly ash-based cementitious material according to claim 4, wherein the mass ratio of the alkali to the alkali metal silicate is 1: 0.5-3.
6. The alkali-activated slag-fly ash mortar for producing an alkali-activated slag-fly ash-based cementitious material according to claim 1 or 2, further comprising an aggregate in an amount of 160 to 200% by weight based on the total weight of the above slag and fly ash.
7. An alkali-activated slag-fly ash-based cementitious material, characterized in that the cementitious material is obtained by curing and maintaining the alkali-activated slag-fly ash mortar of any one of claims 1 to 6.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010144926.3A CN111439948B (en) | 2020-03-04 | 2020-03-04 | Retarder, alkali-activated slag-fly ash mortar and cementing material thereof |
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| CN202010144926.3A CN111439948B (en) | 2020-03-04 | 2020-03-04 | Retarder, alkali-activated slag-fly ash mortar and cementing material thereof |
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| CN115321858B (en) * | 2022-08-15 | 2023-07-14 | 中晶环境科技股份有限公司 | Cementing material, preparation method thereof and application of composition |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1699251A (en) * | 2005-04-29 | 2005-11-23 | 华南理工大学 | Retardation method for alkali-activated-carbonate/slag gel material |
| KR20100090054A (en) * | 2009-02-05 | 2010-08-13 | 전남대학교산학협력단 | Method for fabricating alkali-activated mortar with no cement |
| CN107857543A (en) * | 2017-11-09 | 2018-03-30 | 山东理工大学 | A kind of preparation method of precenting chlorate corrosion environmental protection mortar |
| CN109928685A (en) * | 2019-04-11 | 2019-06-25 | 北京建筑材料科学研究总院有限公司 | Utilize the high-early strength concrete and its preparation method of the preparation of a variety of industrial solid castoffs |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1699251A (en) * | 2005-04-29 | 2005-11-23 | 华南理工大学 | Retardation method for alkali-activated-carbonate/slag gel material |
| KR20100090054A (en) * | 2009-02-05 | 2010-08-13 | 전남대학교산학협력단 | Method for fabricating alkali-activated mortar with no cement |
| CN107857543A (en) * | 2017-11-09 | 2018-03-30 | 山东理工大学 | A kind of preparation method of precenting chlorate corrosion environmental protection mortar |
| CN109928685A (en) * | 2019-04-11 | 2019-06-25 | 北京建筑材料科学研究总院有限公司 | Utilize the high-early strength concrete and its preparation method of the preparation of a variety of industrial solid castoffs |
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