CN114436613A - Treatment-free saw mud based cementing material and preparation method and application thereof - Google Patents

Treatment-free saw mud based cementing material and preparation method and application thereof Download PDF

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CN114436613A
CN114436613A CN202210237755.8A CN202210237755A CN114436613A CN 114436613 A CN114436613 A CN 114436613A CN 202210237755 A CN202210237755 A CN 202210237755A CN 114436613 A CN114436613 A CN 114436613A
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mud
saw mud
treatment
cementing material
original
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CN114436613B (en
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凌刚
徐智勇
胡亮
李华东
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Wuhan Chutian Mingyang Building Materials Co ltd
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Wuhan Chutian Mingyang Building Materials Co ltd
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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
    • C04B28/14—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 calcium sulfate cements
    • C04B28/142—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 calcium sulfate cements containing synthetic or waste calcium sulfate cements
    • C04B28/144—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 calcium sulfate cements containing synthetic or waste calcium sulfate cements the synthetic calcium sulfate being a flue gas desulfurization product
    • 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
    • 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 provides a treatment-free saw mud based cementing material and a preparation method and application thereof. The method comprises the steps of detecting the water content of the original-state sawn mud and the original-state desulfurized gypsum in advance, converting the actual using amount of the original-state sawn mud and the actual using amount of the original-state desulfurized gypsum according to the preset dry weight ratio of the raw materials and the detected water content, and blending the actual using amounts of the original-state sawn mud and the original-state desulfurized gypsum with a predetermined amount of steel slag powder, an exciting agent, a dispersing agent, a water reducing agent and water to prepare the treatment-free sawn mud based cementitious material slurry. Through the mode, the invention can utilize the synergistic effect among the saw mud, the desulfurized gypsum, the steel slag powder and the dispersing agent, so that the untreated original saw mud can be directly used for preparing the cementing material, and the activity of the saw mud can be effectively excited, thereby preparing the saw mud-based cementing material with higher strength, completely replacing cement to be applied to the preparation process of concrete, and realizing the efficient resource utilization of the saw mud.

Description

Treatment-free saw mud based cementing material and preparation method and application thereof
Technical Field
The invention relates to the technical field of cementing materials, in particular to a treatment-free saw mud based cementing material and a preparation method and application thereof.
Background
The production of cement is usually accompanied by high energy consumption and high carbon dioxide emission, which is difficult to achieve by the traditional method for preparing concrete by using cement as a cementing material. Therefore, a new cementing material is needed to be found to replace cement, reduce carbon emission in the concrete industry and meet the requirement of green production.
Saw mud is a by-product in the stone processing process, and is difficult to be effectively utilized due to high water content, easy agglomeration and complex treatment process. And the stacking of a large amount of saw mud can pollute the environment, and the green and sustainable development of the stone industry is seriously hindered. As a large household for material consumption in the concrete industry, if the wet saw mud can be used for preparing a cementing material and is applied to the concrete industry, the carbon emission of the concrete industry can be reduced, the pressure of saw mud stacking on the environment can be greatly reduced, the efficient utilization of saw mud materials is realized, and the effect of changing waste into valuable is achieved.
For example, patent publication No. CN101941848A provides an autoclaved saw mud concrete block and a processing technology thereof, wherein saw mud is dried, crushed and ground, and then the saw mud fine powder is supported, and then mixed with gypsum, lime, cement and aluminum powder and stirred, and then cured and exhausted to form the concrete block. The patent with publication number CN105000855A discloses an autoclaved lightweight sand aerated concrete block and a production process thereof, saw mud, desulfurized gypsum, quick lime, cement and aluminum powder are used as main materials, the quick lime and the desulfurized gypsum are crushed and ball-milled to prepare cementing materials, the saw mud is ground into slurry, then the slurry, the cementing materials and the cement are added into a pouring stirrer in sequence according to a proportion for mixing and stirring, and the autoclaved lightweight sand aerated concrete block is prepared after gas generation and initial setting, static stop cutting and autoclaved curing.
Although the method provided by the patent can solve the problem of stacking the saw mud and realize the recycling of the saw mud, the saw mud is mainly used as a filler in the concrete building block, the activity of the saw mud cannot be fully exerted, and the strength of the concrete is mainly provided by the cement. Therefore, the existing saw-mud-based concrete still needs to be added with cement to provide strength, and the production cost is relatively high; meanwhile, the saw mud is generally required to be subjected to pretreatment such as drying or pulping in the preparation process, the original saw mud is difficult to be directly utilized, and the whole process is complex; in addition, due to the addition of a large amount of low-strength saw mud, the finally obtained concrete has extremely low strength, and generally can only be used as light aerated concrete with low strength requirement, so that the application range is narrow, and the actual consumption of the saw mud is limited.
In view of the above, there is a need to provide a method for activating saw mud particles to prepare a high-strength treatment-free saw mud-based cementitious material that can be used as a complete substitute for cement, so as to solve the above problems.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a treatment-free saw mud-based cementing material, and a preparation method and application thereof. The original-state saw mud is used as a main cementing material and is uniformly mixed with the raw materials such as the desulfurized gypsum, the steel slag powder and the dispersing agent according to a specific proportion, and the synergistic effect among the saw mud, the desulfurized gypsum, the steel slag powder and the dispersing agent is utilized, so that the original-state saw mud which is not pretreated can be directly used for preparing the cementing material, and the activity of the saw mud can be effectively stimulated, and the saw mud-based cementing material with higher strength is prepared to completely replace cement to be applied to the preparation process of concrete.
In order to achieve the aim, the invention provides a preparation method of a treatment-free saw mud-based cementing material, which comprises the following steps:
s1, respectively measuring the water content of the original sawn mud and the original desulfurized gypsum;
s2, respectively weighing predetermined amounts of the original-state sawn mud, the original-state desulfurized gypsum, the steel slag powder, the exciting agent, the dispersing agent and the water reducing agent according to a preset raw material dry weight ratio to serve as main raw materials; the actual usage amounts of the original-state sawn mud and the original-state desulfurized gypsum are converted according to the raw material dry weight ratio and the water content measured in the step S1;
s3, calculating theoretical water demand according to a preset water-cement ratio, and subtracting the water contents in the original-state sawn mud and the original-state desulfurized gypsum weighed in the step S2 from the theoretical water demand to obtain actual water demand; weighing the required water according to the actual water demand;
s4, mixing the main raw materials weighed in the step S2 and the water weighed in the step S3, and fully and uniformly stirring to obtain the treatment-free saw mud-based cementing material slurry.
As a further improvement of the present invention, in step S2, the preset dry weight ratios of the raw materials are as follows:
60-80 parts of saw mud, 10-20 parts of desulfurized gypsum, 10-20 parts of steel slag powder, 2-6 parts of an activator, 0.1-0.5 part of a dispersant and 1-2 parts of a water reducing agent.
As a further improvement of the invention, in step S1, the raw saw mud is granite saw mud with a water content of 15-35 wt%; the water content of the undisturbed desulfurization gypsum is less than or equal to 10 wt%.
As a further improvement of the present invention, in step S1, the granite saw mud is a mixture of granite fine powder in which SiO is mixed with water2Mass fraction of Al is more than or equal to 70 percent, Al2O3The mass fraction of the component (A) is more than or equal to 10 percent.
As a further improvement of the invention, in step S2, the mass fraction of CaO in the steel slag powder is more than or equal to 35 percent; the mass fraction of the powder with the grain diameter less than or equal to 80 mu m in the steel slag powder is more than or equal to 10 percent.
As a further improvement of the present invention, in step S2, the activator is water glass or sodium sulfate, the dispersant is sodium methacrylate sulfonate, and the water reducing agent is a polycarboxylic acid water reducing agent.
In a further improvement of the present invention, in step S3, the water-to-glue ratio is 0.30 to 0.32.
As a further improvement of the invention, the method also comprises the following steps:
and S5, pouring the slurry of the treatment-free saw mud-based cementing material obtained in the step S4 into a test mold, standing for a predetermined time, then removing the mold, and curing under standard conditions for a predetermined age to obtain the hardened treatment-free saw mud-based cementing material.
In order to achieve the purpose, the invention also provides a treatment-free saw mud-based cementing material which is prepared according to any one of the technical schemes.
The invention also provides application of the treatment-free saw mud based cementing material in the field of concrete.
The invention has the beneficial effects that:
(1) the invention providesThe preparation method of the treatment-free saw mud based cementing material comprises the steps of taking original saw mud as a main cementing material, and uniformly mixing the original saw mud with raw materials such as desulfurized gypsum, steel slag powder, a dispersing agent and the like according to a specific ratio, so that the original saw mud which is not pretreated is fully dispersed under the action of the dispersing agent, and the full reaction is ensured. In the reaction process, the desulfurized gypsum is used as an excitant and a regulator, the steel slag powder is used as a calcium source and provides an alkaline environment, and the combined action of the desulfurized gypsum and the steel slag powder forms Ca2+、SO4 2-And OH-The alkaline environment of the saw mud can excite the saw mud and promote Al in the saw mud3+Thereby releasing SiO in the saw mud4 2-And SiO4 2-The ions agglomerate, thereby making the saw mud particles have secondary hydration activity. Meanwhile, the desulfurized gypsum and the steel slag powder added according to the specific proportion can also form Ca2+Excessive environment to free Ca2+With SiO4 2-And the bonding is carried out, so that the formation of hydrated calcium silicate gel is promoted, the saw mud-based cementing material system is hardened and reaches a certain strength, and the performance requirements of materials such as concrete, mortar, building blocks and the like on the cementing material are met.
(2) According to the invention, sodium methacrylate is further preferably selected as the dispersing agent, so that calcium ions on the surface of the sawn mud can be replaced by sodium ions in the dispersing agent, the charge balance on the surface of sawn mud particles is destroyed, the surface of the sawn mud particles is negatively charged, the repulsive force among the sawn mud particles is enhanced, and the dispersing effect of the sawn mud particles is greatly enhanced. Meanwhile, the sodium methacrylate is very easy to adsorb on the surfaces of saw mud particles under an alkaline condition to form a double-electric-layer structure, so that the saw mud is more stably dispersed, and the invention can directly use the untreated saw mud as a raw material, effectively avoid the saw mud from agglomerating, simplify the preparation process and improve the performance of the cementing material. And the dispersant has smaller molecular weight, can be preferentially adsorbed on the surface of the saw mud compared with the water reducing agent, not only ensures the efficient dispersion effect on the saw mud, but also avoids the problem that the water reducing effect is weakened after the water reducing agent is adsorbed. In addition, the sodium methacrylate sulfonate used as the dispersant in the invention not only can disperse the saw mud, but also can have a synergistic effect with the desulfurized gypsum and the steel slag powder, and the activity of the saw mud is further excited by using the displaced calcium ions, so that the strength of the saw mud-based cementing material is effectively improved.
(3) The preparation process of the treatment-free saw mud base cementing material provided by the invention is simple, the saw mud does not need to be pretreated, the prepared saw mud base cementing material has higher strength after being hardened, the 3d compressive strength can reach 11.5-32.1 MPa, the 28d compressive strength can reach 39.1-51.4 MPa, the prepared saw mud base cementing material can completely replace cement to be applied to concrete, the 3d compressive strength of the prepared concrete can reach 25.3MPa, the 28d compressive strength can reach 54.3MPa, the strength is obviously higher than the strength standard of C40, the production cost of the concrete is greatly reduced, the efficient utilization of the saw mud is realized, the carbon emission in the concrete industry can be greatly reduced, the low-carbon and green production is realized, and the treatment-free saw mud base cementing material has higher practical application value.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in detail below with reference to specific embodiments.
It should be noted that, in order to avoid obscuring the present invention with unnecessary details, only the structures and/or processing steps closely related to the scheme of the present invention are shown, and other details not closely related to the present invention are omitted.
In addition, it is also to be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
The invention provides a preparation method of a treatment-free saw mud-based cementing material, which comprises the following steps:
s1, respectively measuring the water content of the original sawn mud and the original desulfurized gypsum;
s2, respectively weighing predetermined amounts of the original state sawn mud, the original state desulfurized gypsum, the steel slag powder, an excitant, a dispersant and a water reducing agent according to a preset raw material dry weight ratio to serve as main raw materials; the actual usage amounts of the original-state sawn mud and the original-state desulfurized gypsum are converted according to the raw material dry weight ratio and the water content measured in the step S1;
s3, calculating theoretical water demand according to a preset water-cement ratio, and subtracting the water contents in the original-state sawn mud and the original-state desulfurized gypsum weighed in the step S2 from the theoretical water demand to obtain actual water demand; weighing the required water according to the actual water demand;
s4, mixing the main raw materials weighed in the step S2 and the water weighed in the step S3, and fully and uniformly stirring to obtain the treatment-free saw mud-based cementing material slurry.
In step S1, the undisturbed saw mud is granite saw mud with the water content of 15-35 wt%; the granite saw mud is a mixture of granite micro powder and water, wherein SiO is contained in the granite micro powder2Mass fraction of Al is more than or equal to 70 percent, Al2O3The mass fraction of the active carbon is more than or equal to 10 percent; the water content of the undisturbed desulfurization gypsum is less than or equal to 10 wt%.
In step S2, the preset raw material dry weight ratios are as follows:
60-80 parts of saw mud, 10-20 parts of desulfurized gypsum, 10-20 parts of steel slag powder, 2-6 parts of an activator, 0.1-0.5 part of a dispersant and 1-2 parts of a water reducing agent.
The mass fraction of CaO in the steel slag powder is more than or equal to 35 percent; the mass fraction of powder with the grain diameter less than or equal to 80 mu m in the steel slag powder is more than or equal to 10 percent; the activator is water glass or sodium sulfate, the dispersant is sodium methacrylate sulfonate, and the water reducing agent is a polycarboxylic acid water reducing agent.
In step S3, the water-glue ratio is 0.30-0.32.
The preparation method of the treatment-free saw mud-based cementing material also comprises the following steps:
and S5, pouring the slurry of the treatment-free saw mud-based cementing material obtained in the step S4 into a test mold, standing for a predetermined time, then removing the mold, and curing under standard conditions for a predetermined age to obtain the hardened treatment-free saw mud-based cementing material.
The invention also provides a treatment-free saw mud-based cementing material which is prepared according to the technical scheme.
The invention also provides application of the treatment-free saw mud based cementing material in the field of concrete.
The invention provides a treatment-free saw mud-based cementing material, a preparation method and application thereof, which are described in the following with reference to specific embodiments.
Example 1
The embodiment provides a preparation method of a treatment-free saw mud-based cementing material, which comprises the following steps:
and S1, respectively measuring the water content of the original-state sawn mud and the original-state desulfurized gypsum, and measuring that the water content of the original-state sawn mud is 16.3 percent and the water content of the original-state desulfurized gypsum is 4.7 percent.
S2, weighing the main raw materials according to the following raw material dry weight ratio:
70 parts of saw mud, 15 parts of desulfurized gypsum, 15 parts of steel slag powder, 5 parts of an excitant, 0.4 part of a dispersant and 1.8 parts of a water reducing agent; wherein the excitant is water glass, the dispersant is sodium methacrylate, and the water reducing agent is a polycarboxylic acid water reducing agent.
The above proportions all represent parts by weight, wherein the sawn mud and the desulfurized gypsum refer to dry weights of raw materials containing no water, and 83.6 parts of undisturbed sawn mud and 15.7 parts of undisturbed desulfurized gypsum are actually weighed after conversion by combining the undisturbed sawn mud and the undisturbed desulfurized gypsum which are actually used in step S1.
S3, calculating according to the water-to-glue ratio of 0.30 to obtain that the theoretical water demand is 30 parts, and subtracting the water content in the original sawn mud weighed in the step S2 and the original desulfurized gypsum to obtain that the actual water demand is 15.7 parts; and weighing the required water according to the actual water demand.
And S4, mixing the main raw materials weighed in the step S2 and the water weighed in the step S3, and fully and uniformly stirring to obtain the treatment-free saw mud-based cementing material slurry.
The fluidity of the treatment-free saw mud-based cementing material slurry obtained by the embodiment is 220mm through testing.
S5, pouring the treatment-free saw mud-based cementing material slurry obtained in the step S4 into a test mold, standing for 24 hours, then removing the mold, and curing under standard conditions (20 +/-2 ℃ and humidity more than or equal to 95%) for a predetermined age to obtain the hardened treatment-free saw mud-based cementing material.
In this embodiment, the raw saw mud used is granite saw mud, which is a mixture of granite micropowder and water generated during cutting and polishing of granite stone; the used desulfurized gypsum is industrial byproduct gypsum obtained by coal-fired or oil-fired enterprises after treating sulfur dioxide in flue gas; after the original sawn mud and the original desulfurized gypsum are dried, the chemical components are respectively measured and shown in tables 1 and 2. The steel slag powder used in the embodiment is obtained by grinding steel slag left after extracting iron from slag generated in steel making, the mass fraction of powder with the particle size of less than or equal to 80 μm in the steel slag powder is more than or equal to 10%, and the chemical components of the powder are shown in Table 3.
TABLE 1 chemical composition table of original saw mud after drying
Figure BDA0003540555220000071
TABLE 2 chemical composition table of original desulfurized gypsum after drying
Figure BDA0003540555220000072
TABLE 3 chemical composition of steel slag powder
Figure BDA0003540555220000073
In this example, the curing in step S5 was carried out for predetermined ages of 3d and 28d, and the compressive strength of the hardened treatment-free saw mud-based cementitious material obtained by curing 3d and 28d, respectively, was tested, and the results are shown in table 4.
Table 4 compressive strength of different ages of saw mud based cementitious materials prepared in example 1
3d compressive Strength (MPa) 28d compressive Strength (MPa)
Example 1 22.7 51.4
As can be seen from Table 4, the treatment-free saw mud-based cementing material prepared by the method provided by the embodiment has high mechanical properties, has 28d strength of 51.4MPa, and can completely replace cement to be used for preparing concrete.
Examples 2 to 9 and comparative examples 1 to 8
Examples 2 to 9 and comparative examples 1 to 8 respectively provide a preparation method of a treatment-free saw mud-based cementing material, which is different from example 1 in that the dry weight ratio of the raw materials in step S2 is changed, the raw material ratios corresponding to the examples and comparative examples are shown in table 4, and the rest steps and parameters are consistent with those of example 1 and are not repeated herein.
TABLE 4 raw material dry weight ratios (unit: parts by weight) of examples 2 to 9 and comparative examples 1 to 8
Figure BDA0003540555220000081
Figure BDA0003540555220000091
The 3d and 28d age hardened, treatment-free saw mud-based cements prepared in the above examples and comparative examples were tested for compressive strength and the results are shown in table 5.
TABLE 5 Performance data for examples 2-9 and comparative examples 1-8
Examples/comparative examples 3d compressive Strength (MPa) 28d compressive Strength (MPa)
Example 2 26.4 42.2
Example 3 14.2 44.8
Example 4 24.6 49.7
Example 5 20.3 48.1
Example 6 11.5 43.9
Example 7 30.2 51.4
Example 8 13.6 41.6
Example 9 32.1 50.9
Comparative example 1 9.7 32.1
Comparative example 2 12.7 25.8
Comparative example 3 8.2 21.1
Comparative example 4 18.2 41.1
Comparative example 5 14.7 33.8
Comparative example 6 10.4 29.3
Comparative example 7 14.7 38.6
Comparative example 8 7.8 33.1
As can be seen from Table 5, the adjustment of the raw material ratios has an important influence on the product performance.
Specifically, the increased amounts of desulfurized gypsum and steel slag fines in example 2 increased the early hydration of the cementitious material and thus the 3d strength, as compared to example 1, but resulted in a slightly lower 28d strength due to the lower saw mud content. Example 3 reduction of the amount of gypsum and steel slag powder resulted in free Ca in the system2+And SO4 2-Is low enough not to remove Al in the saw mud3+The resulting polymer is sufficiently dissociated, and the activity thereof cannot be sufficiently exerted, resulting in a decrease in the strength of the slurry.
Compared with the example 1, the reduction of the dosage of the exciting agent in the example 6 can cause that the alkalinity in the system is too low, the activity of the sawn mud is difficult to be completely excited, and the strength is obviously reduced; in example 7, the strength of the activator is reduced to a certain extent by increasing the mixing amount of the activator, mainly because the activator content is too high, the system is hydrated too fast, and the microstructure of the activator has certain defects, so that the later strength is slightly low; the absence of the addition of the activator at all in comparative example 8 also reduces the reduction in the activity of the saw mud, resulting in a significant reduction in the strength of the cement. In addition, the reduction of the mixing amount of the water reducing agent in the embodiment 8 can cause the insufficient fluidity of the slurry, and the difficulty in forming a compact structure, thereby causing the obvious lower strength of the slurry; in example 9, the water reducing agent is added in an amount which has no obvious influence on the flow property of the slurry, but the water reducing agent has a certain adverse effect on the hydration of the cementing material due to the relatively high dosage of the water reducing agent, so that the later strength of the cementing material is low.
It can be seen from the data of examples 1, 4-5 and 1-7 that the reduction of the mixing amount of the desulfurized gypsum and the steel slag powder or the adjustment of the ratio of the desulfurized gypsum and the steel slag powder can cause the formation of the cementing materialThe mechanical properties are obviously changed. This is mainly because the synergistic effect of the desulfurized gypsum and the steel slag powder is required in the cementing material system to jointly activate the activity of the saw mud. During the reaction, desulfurized gypsum is hydrolyzed to produce Ca2+And SO4 2-Free OH generated by hydrolysis of steel slag powder-Under the condition that the three ions exist, Al in the saw mud can be promoted due to double salt effect3+Thereby releasing SiO in the saw mud4 2-So that the saw mud has secondary hydration activity; at the same time, excessive free Ca is generated by the hydrolysis of the steel slag powder2+Can be mixed with SiO4 2-Combining to generate hydrated calcium silicate gel with strength, so that the cementing material has certain strength. Therefore, reducing the amount of one material or changing the ratio of the two materials can affect the secondary hydration reaction of the saw mud, so that the later strength of the cementing material is reduced.
Examples 10 to 11 and comparative examples 9 to 12
Examples 10 to 11 and comparative examples 9 to 12 each provide a preparation method of a treatment-free saw mud-based cementing material, which is different from example 1 in that the kind and the amount of the dispersant in step S2 are changed, the kinds and the amounts of the dispersants corresponding to the examples and comparative examples are shown in table 6, and the remaining steps and parameters are the same as those in example 1, and are not repeated herein.
TABLE 6 kinds and amounts of dispersants used in examples 10 to 11 and comparative examples 9 to 12
Examples/comparative examples Kind of dispersant Amount of dispersant (parts by weight)
Example 10 Methacrylic acid sodium sulfonate 0.1
Example 11 Methacrylic acid sodium sulfonate 0.5
Comparative example 9 - 0
Comparative example 10 Methacrylic acid sodium sulfonate 1
Comparative example 11 Polyacrylamide sodium salt 0.4
Comparative example 12 Stearic acid monoglyceride 0.4
The flow of the slurry of the treatment-free saw mud-based cementitious material prepared in each of the above examples and comparative examples was tested, and the compressive strength of the hardened treatment-free saw mud-based cementitious material at 3d and 28d ages was also tested, and the results are shown in table 7.
TABLE 7 Performance data for examples 10-11 and comparative examples 9-12
Examples/comparative examples Fluidity (mm) 3d compressive Strength (MPa) 28d compressive Strength (MPa)
Example 10 145 15.3 39.1
Example 11 240 23.1 50.1
Comparative example 9 110 11.5 28.5
Comparative example 10 275 16.5 41.5
Comparative example 11 160 19.4 41.7
Comparative example 12 185 20.8 43.5
As can be seen from Table 7, the incorporation of the dispersant has a significant effect on the fluidity of the cement slurry.
Example 10, compared to example 1, reduced amount of dispersant, reduced the dispersion effect of the sawn mud in the slurry, a certain amount of agglomerated sawn mud particles inside, and included a large amount of free water, resulting in reduced fluidity, and the sawing mud fluidization reaction was also affected, resulting in lower strength. In comparative example 9, in which no dispersant was incorporated at all, the dispersing effect was further lowered and the strength was also affected, as compared with example 10. Although the amount of the dispersant added is increased in example 11, a good dispersing effect is achieved, and the further increase of the dispersant does not significantly improve the dispersing effect of the saw mud, and the change of the mechanical properties is not large. In addition, in comparative example 10, the yield of the dispersant is greatly increased, and although the fluidity is increased, the segregation of the slurry is caused, the homogeneity is reduced, and the mechanical properties are also affected. Therefore, the amount of the dispersant to be added needs to be controlled in an appropriate range.
Compared with the embodiment 1, the two dispersants of sodium polyacrylate and glycerol monostearate are respectively adopted in the comparative examples 11 to 12, the dispersing effect is obviously lower than that of the sodium methacrylate sulfonate selected in the invention, so that the slurry fluidity in the comparative examples 11 to 12 is obviously reduced, and the mechanical property is also lower. The reason is that the molecular weight of the sodium polyacrylate is too large to be adsorbed on the surface of the saw mud particles in preference to the water reducing agent, and the dispersing effect of the dispersing agent is affected by the stearic acid monoglyceride because the stearic acid monoglyceride cannot perform ion exchange. By selecting the sodium methacrylate as the dispersing agent, the application not only can play an excellent dispersing effect, but also can ensure that the water reducing agent can fully play a water reducing role so as to enable the slurry to have proper fluidity; and the dispersant can also perform ion exchange with the saw mud, so that the activity of the saw mud is further excited, and the strength of the saw mud-based cementing material is effectively improved.
Example 12 and comparative example 13
Embodiment 12 provides a use of a treatment-free saw mud-based cementitious material in concrete, comprising the steps of:
the treatment-free saw mud-based cementitious material slurry prepared in step S4 in example 1 was mixed with river sand and crushed stone in a mixing ratio of 1:1.36:3.03, wherein the weight of the cementitious material was the weight under dry conditions, to obtain saw mud-based concrete.
Comparative example 13 differs from example 12 in that the treatment-free saw mud-based cementitious material slurry was replaced with an equal amount of cement slurry to give a cement-based concrete.
The sawn-mud-based concrete prepared in example 12 and the cement-based concrete prepared in comparative example 13 were tested for compressive strength at 3d and 28d, and the results are shown in table 8.
TABLE 8 Performance data for example 12 and comparative example 13
Figure BDA0003540555220000121
Figure BDA0003540555220000131
As can be seen from Table 8, the 3d strength of the sawn-mud-based concrete prepared by the method provided by the invention is slightly lower than that of the conventional C40 concrete, but the 28d strength of the sawn-mud-based concrete is obviously higher than that of the C40 strength standard, which indicates that the sawn-mud-based cementing material provided by the invention not only can completely replace cement, but also can even reach the compressive strength higher than that of the cement. The method provided by the invention has the advantages that the high Si content in the saw mud is fully utilized, the activity of the saw mud is fully excited through the synergistic effect of the desulfurized gypsum, the steel slag powder and the dispersing agent, the saw mud is subjected to secondary hydration in the later period to generate high-strength hydrated calcium silicate gel, a cementing material system of the high-strength hydrated calcium silicate gel has high strength, and the later strength of the prepared concrete is higher than that of common concrete.
In conclusion, the invention provides a treatment-free saw mud-based cementing material, and a preparation method and application thereof. The method comprises the steps of detecting the water content of the original-state sawn mud and the original-state desulfurized gypsum in advance, converting the actual using amount of the original-state sawn mud and the actual using amount of the original-state desulfurized gypsum according to the preset dry weight ratio of the raw materials and the detected water content, and blending the actual using amounts of the original-state sawn mud and the original-state desulfurized gypsum with a predetermined amount of steel slag powder, an exciting agent, a dispersing agent, a water reducing agent and water to prepare the treatment-free sawn mud based cementitious material slurry. Through the mode, the invention can utilize the synergistic effect among the saw mud, the desulfurized gypsum, the steel slag powder and the dispersing agent, so that the untreated original saw mud can be directly used for preparing the cementing material, and the activity of the saw mud can be effectively excited, thereby preparing the saw mud-based cementing material with higher strength, completely replacing cement to be applied to the preparation process of concrete, and realizing the efficient resource utilization of the saw mud.
Although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the spirit and scope of the present invention.

Claims (10)

1. The preparation method of the treatment-free saw mud-based cementing material is characterized by comprising the following steps of:
s1, respectively measuring the water content of the original sawn mud and the original desulfurized gypsum;
s2, respectively weighing predetermined amounts of the original-state sawn mud, the original-state desulfurized gypsum, the steel slag powder, the exciting agent, the dispersing agent and the water reducing agent according to a preset raw material dry weight ratio to serve as main raw materials; the actual usage amounts of the original-state sawn mud and the original-state desulfurized gypsum are converted according to the raw material dry weight ratio and the water content measured in the step S1;
s3, calculating theoretical water demand according to a preset water-cement ratio, and subtracting the water contents in the original-state sawn mud and the original-state desulfurized gypsum weighed in the step S2 from the theoretical water demand to obtain actual water demand; weighing the required water according to the actual water demand;
s4, mixing the main raw materials weighed in the step S2 and the water weighed in the step S3, and fully and uniformly stirring to obtain the treatment-free saw mud-based cementing material slurry.
2. The method for preparing the treatment-free saw mud-based cementing material according to the claim 1, which is characterized in that: in step S2, the preset raw material dry weight ratios are as follows:
60-80 parts of saw mud, 10-20 parts of desulfurized gypsum, 10-20 parts of steel slag powder, 2-6 parts of an activator, 0.1-0.5 part of a dispersant and 1-2 parts of a water reducing agent.
3. The method for preparing the treatment-free saw mud-based cementing material according to the claim 1, which is characterized in that: in step S1, the undisturbed saw mud is granite saw mud with the water content of 15-35 wt%; the water content of the undisturbed desulfurization gypsum is less than or equal to 10 wt%.
4. The method for preparing the treatment-free saw mud-based cementing material according to the claim 3, which is characterized in that: in step S1, the granite saw mud is a mixture of granite fine powder in which SiO is present and water2Mass fraction of Al is more than or equal to 70 percent, Al2O3The mass fraction of the component (A) is more than or equal to 10 percent.
5. The method for preparing the treatment-free saw mud-based cementing material according to the claim 1, which is characterized in that: in step S2, the mass fraction of CaO in the steel slag powder is more than or equal to 35%; the mass fraction of the powder with the grain diameter less than or equal to 80 mu m in the steel slag powder is more than or equal to 10 percent.
6. The method for preparing the treatment-free saw mud-based cementing material according to the claim 1, which is characterized in that: in step S2, the activator is water glass or sodium sulfate, the dispersant is sodium methacrylate sulfonate, and the water reducing agent is a polycarboxylic acid water reducing agent.
7. The method for preparing the treatment-free saw mud-based cementing material according to the claim 1, which is characterized in that: in step S3, the water-glue ratio is 0.30-0.32.
8. The method for preparing the treatment-free saw mud-based cementing material according to the claim 1, which is characterized by further comprising the following steps:
and S5, pouring the slurry of the treatment-free saw mud-based cementing material obtained in the step S4 into a test mold, standing for a predetermined time, then removing the mold, and curing under standard conditions for a predetermined age to obtain the hardened treatment-free saw mud-based cementing material.
9. The utility model provides a exempt from to handle saw mud base cementitious material which characterized in that: the treatment-free saw mud-based cementing material is prepared according to the preparation method of any one of claims 1 to 8.
10. The application of the treatment-free saw mud-based cementing material prepared by the preparation method of any one of claims 1 to 7 is characterized in that: the treatment-free saw mud based cementing material is used in the field of concrete.
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115849751A (en) * 2022-11-24 2023-03-28 南京理工大学 Rock grinding and saw mud artificial aggregate and preparation method thereof
CN117049808A (en) * 2023-07-18 2023-11-14 武汉华强新型建筑材料有限公司 Low-cost and environment-friendly stone sawing mud recycled aggregate, preparation method and application

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB134230A (en) *
CN101941848A (en) * 2010-08-04 2011-01-12 翟玉波 Autoclaved sawn mud concrete building block and processing technique thereof
CN104692739A (en) * 2015-01-30 2015-06-10 武汉理工大学 Stone saw mud self-insulation light block and preparation method thereof
CN109020452A (en) * 2018-10-09 2018-12-18 河南能工巧匠网络科技有限公司 A method of utilizing the clay standby Antique Imitation Tiles of saw
CN113292299A (en) * 2021-05-24 2021-08-24 山东轩安新型建材有限公司 Autoclaved aerated concrete and preparation method thereof

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB134230A (en) *
CN101941848A (en) * 2010-08-04 2011-01-12 翟玉波 Autoclaved sawn mud concrete building block and processing technique thereof
CN104692739A (en) * 2015-01-30 2015-06-10 武汉理工大学 Stone saw mud self-insulation light block and preparation method thereof
CN109020452A (en) * 2018-10-09 2018-12-18 河南能工巧匠网络科技有限公司 A method of utilizing the clay standby Antique Imitation Tiles of saw
CN113292299A (en) * 2021-05-24 2021-08-24 山东轩安新型建材有限公司 Autoclaved aerated concrete and preparation method thereof

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115849751A (en) * 2022-11-24 2023-03-28 南京理工大学 Rock grinding and saw mud artificial aggregate and preparation method thereof
CN117049808A (en) * 2023-07-18 2023-11-14 武汉华强新型建筑材料有限公司 Low-cost and environment-friendly stone sawing mud recycled aggregate, preparation method and application

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