CN115385615B - Cement-based grouting material - Google Patents
Cement-based grouting material Download PDFInfo
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- CN115385615B CN115385615B CN202210848870.9A CN202210848870A CN115385615B CN 115385615 B CN115385615 B CN 115385615B CN 202210848870 A CN202210848870 A CN 202210848870A CN 115385615 B CN115385615 B CN 115385615B
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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
- C04B28/02—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 hydraulic cements other than calcium sulfates
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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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/70—Grouts, e.g. injection mixtures for cables for prestressed concrete
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Abstract
The invention provides a cement-based grouting material, which comprises a cementing material, anhydrite, quartz sand, a defoaming agent, a water reducing agent and a plastic expanding agent; the mixing amount of the defoaming agent is 0.05-0.2% of the cementing material, the mixing amount of the water reducing agent is 0.15-0.03% of the cementing material, the mixing amount of the plastic expanding agent is 0.1-0.3% of the cementing material, the cementing material comprises a rigid expanding agent and cement, the mixing amount of the rigid expanding agent is less than 10% of the cementing material, and the mixing amount of the anhydrite is less than 5% of the cementing material. The invention solves the problem that the cement grouting material in the prior art is easy to shrink due to insufficient expansion and strength.
Description
Technical Field
The invention relates to the technical field of engineering materials, in particular to cement-based grouting material and a preparation method thereof.
Background
In recent decades, urban architecture in China has been rapidly developed, and structural cracks and gaps caused by various factors are inevitably encountered in construction, so that a certain reinforcing material is needed to improve and correct the defects so as to ensure the safety, durability and the like of the structure. At the same time, in the present day, there are also many structures with aged structures, and there is a need for a method for filling and modifying the structures by materials which are economical, fast and effective, wherein the most selected material for repairing the cracks of the structures is cement-based grouting material in a large aspect.
The cement-based grouting material is a dry mixed material formed by mixing raw materials such as cement, aggregate (or no aggregate), admixture, mineral admixture and the like. With the rapid development of structural reinforcement engineering, cement-based grouting materials are increasingly being used in reinforcement fields, such as reinforcement of beams and columns. Therefore, it becomes important to improve the overall properties of the cement grouting material.
In the prior art, most of the cement grouting materials are easy to shrink due to insufficient expansion and strength.
Disclosure of Invention
Accordingly, the present invention is directed to a cement-based grouting material, which solves the problem that the cement-based grouting material in the prior art is easy to shrink due to insufficient expansion and strength.
The cement-based grouting material provided by the invention comprises the following components:
comprises cementing materials, anhydrite, quartz sand, defoamer, water reducer and plastic expanding agent;
the mixing amount of the defoaming agent is 0.05-0.2% of the cementing material, the mixing amount of the water reducing agent is 0.15-0.03% of the cementing material, the mixing amount of the plastic expanding agent is 0.1-0.3% of the cementing material, the cementing material comprises a rigid expanding agent and cement, the mixing amount of the rigid expanding agent is less than 10% of the cementing material, and the mixing amount of the anhydrite is less than 5% of the cementing material.
Preferably, in the cement-based grouting material, the rigid expanding agent is sulphoaluminate cement.
Preferably, in the cement-based grouting material, the blending amount of the defoaming agent is 0.1% of that of the cementing material.
Preferably, in the cement-based grouting material, the mixing amount of the water reducer is 0.25% of the cementing material.
Preferably, in the cement-based grouting material, the mixing amount of the plastic expanding agent is 0.1% of that of the cementing material.
Preferably, the cement-based grouting material further comprises retarder, and the mixing amount of the retarder is 0.06% -0.24% of the cementing material.
Preferably, in the cement-based grouting material, the mixing amount of the retarder is 0.18% of the cementing material.
Preferably, in the cement-based grouting material, the retarder is one or a combination of sodium gluconate and tartaric acid.
Preferably, in the cement-based grouting material, the mixing ratio of the sodium gluconate to the tartaric acid is 3:5.
Preferably, in the cement-based grouting material, the cement-based grouting material has a cement-sand ratio of 1:1.2, the cement-based grouting material has a water-cement ratio of 0.3, the mixing amount of the rigid expanding agent is 7.5% of the cementing material, and the mixing amount of the anhydrite is 3.75% of the cementing material.
Compared with the prior art, the cement-based grouting material provided by the invention has the advantages that the defoaming agent, the water reducing agent and the plastic expanding agent are added, and the defoaming agent, the water reducing agent and the plastic expanding agent are reasonably mixed in proportion, so that the cement-based grouting material has good strength on the premise of ensuring the expansion performance, and the shrinkage of the cement-based grouting material is avoided. Solves the problem that the cement grouting material in the prior art is easy to shrink due to insufficient expansion and strength.
Drawings
FIG. 1 is a schematic view showing the effect of the blending amount of the defoaming agent in a cement-based grouting material on the fluidity and strength of the cement-based grouting material according to the embodiment of the present invention;
FIG. 2 is a schematic view showing the effect of the amount of water reducer in a cement-based grouting material on the strength of the cement-based grouting material according to the embodiment of the invention;
FIG. 3 is a schematic view showing the effect of the amount of sodium gluconate alone in a cement-based grouting material on fluidity and strength of the cement-based grouting material according to an embodiment of the present invention;
FIG. 4 is a schematic view showing the effect of the amount of single tartaric acid in a cement-based grouting material on fluidity and strength of the cement-based grouting material according to an embodiment of the present invention;
FIG. 5 is a schematic view showing the influence of the blending amount of the re-blended sodium gluconate and the tartaric acid in the cement-based grouting material on the fluidity and the strength of the cement-based grouting material according to the embodiment of the invention;
FIG. 6 is a schematic view showing the effect of the amount of plastic expanding agent in cement-based grouting material on fluidity, expansion rate and strength of cement-based grouting material according to the embodiment of the present invention;
fig. 7 is a schematic view showing the effect of the amount of the rigid expanding agent in the cement-based grouting material on the fluidity and strength of the cement-based grouting material according to the embodiment of the present invention.
Detailed Description
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
Furthermore, the term "and/or" as used herein includes any and all combinations of one or more of the associated listed items. In the detailed description and claims, a list of items connected by the term "one of" may mean any of the listed items. For example, if items a and B are listed, the phrase "one of a and B" means either only a or only B. In another example, if items A, B and C are listed, one of the phrases "A, B and C" means only a; only B; or only C. Item a may comprise a single element or multiple elements. Item B may comprise a single element or multiple elements. Item C may comprise a single element or multiple elements. In the detailed description and claims, a list of items connected by the terms "at least one of," "at least one of," or other similar terms may mean any combination of the listed items. For example, if items a and B are listed, the phrase "at least one of a and B" or "at least one of a or B" means only a; only B; or A and B. In another example, if items A, B and C are listed, the phrase "at least one of A, B and C" or "at least one of A, B or C" means only a; or only B; only C; a and B (excluding C); a and C (excluding B); b and C (excluding A); or A, B and C. Item a may comprise a single element or multiple elements. Item B may comprise a single element or multiple elements. Item C may comprise a single element or multiple elements.
The invention provides a cement-based grouting material aiming at the problems that microcracks and deformation can be generated in a cast building due to insufficient expansion degree and strength of the cement-based grouting material used at present, wherein the cement-based grouting material comprises a cementing material, anhydrite, quartz sand, a defoaming agent, a water reducing agent and a plastic expansion agent, and the cementing material comprises a rigid expansion agent and cement.
In some embodiments of the invention, the defoamer is incorporated in an amount of 0.05% to 0.2%, e.g., 0.05%, 0.1%, 0.15%, 0.2%, etc., the water reducer is incorporated in an amount of 0.15% to 0.03%, e.g., 0.15%, 0.20%, 0.25%, 0.30%, etc., of the cementitious material, wherein the water reducer is a polycarboxylate water reducer, the plastic expander is incorporated in an amount of 0.1% to 0.3%, e.g., 0.1%, 0.2%, 0.3%, etc., the rigid expander is incorporated in an amount of less than 10%, and the anhydrite is incorporated in an amount of less than 5%, etc., of the cementitious material, wherein the rigid expander is a thioaluminate cement.
In some embodiments of the present invention, the cement-based grouting material further includes a retarder, the mixing amount of the retarder is 0.06% -0.24% of the cementing material, for example, 0.06%, 0.12%, 0.18%, 0.24% and the like, the retarder is formed by combining sodium gluconate and tartaric acid, and the mixing amount ratio of the retarder is (1-7): (7-1), for example 1:7,2:6,3:5,4:4,5:3,6:2,7:1, etc.
The preparation process of the cement-based grouting material comprises the following steps: and fully stirring and mixing the cementing material, the anhydrite, the quartz sand, the defoamer, the water reducer, the plastic expanding agent and the required additives according to a set proportion.
In order to facilitate an understanding of the invention, several embodiments of the invention will be presented below. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Example 1
The weight ratio of the cement-based grouting material, the rigid expanding agent, the cement and the anhydrite in the embodiment is 2.5:25:1, and the mortar ratio is 1:1.2, the water-gel ratio is 0.3, the mixing amount of the defoamer is 0.05 percent, and the mixing amount of the water reducer is 0.25 percent.
Example 2
The weight ratio of the cement-based grouting material, the rigid expanding agent, the cement and the anhydrite in the embodiment is 2.5:25:1, and the mortar ratio is 1:1.2, the water-gel ratio is 0.3, the mixing amount of the defoamer is 0.1%, and the mixing amount of the water reducer is 0.25%.
Example 3
The weight ratio of the cement-based grouting material, the rigid expanding agent, the cement and the anhydrite in the embodiment is 2.5:25:1, and the mortar ratio is 1:1.2, the water-gel ratio is 0.3, the mixing amount of the defoamer is 0.15 percent, and the mixing amount of the water reducer is 0.25 percent.
Example 4
The weight ratio of the cement-based grouting material, the rigid expanding agent, the cement and the anhydrite in the embodiment is 2.5:25:1, and the mortar ratio is 1:1.2, the water-gel ratio is 0.3, the mixing amount of the defoamer is 0.2%, and the mixing amount of the water reducer is 0.25%.
Example 5
The weight ratio of the cement-based grouting material, the rigid expanding agent, the cement and the anhydrite in the embodiment is 2.5:25:1, and the mortar ratio is 1:1.2, the water-gel ratio is 0.3, the mixing amount of the defoamer is 0.1 percent, and the mixing amount of the water reducer is 0.15 percent.
Example 6
The weight ratio of the cement-based grouting material, the rigid expanding agent, the cement and the anhydrite in the embodiment is 2.5:25:1, and the mortar ratio is 1:1.2, the water-gel ratio is 0.3, the mixing amount of the defoamer is 0.1%, and the mixing amount of the water reducer is 0.20%.
Example 7
The weight ratio of the cement-based grouting material, the rigid expanding agent, the cement and the anhydrite in the embodiment is 2.5:25:1, and the mortar ratio is 1:1.2, the water-gel ratio is 0.3, the mixing amount of the defoamer is 0.15 percent, and the mixing amount of the water reducer is 0.30 percent.
Example 8
The weight ratio of the cement-based grouting material, the rigid expanding agent, the cement and the anhydrite in the embodiment is 2.5:25:1, and the mortar ratio is 1:1.2, the water-gel ratio is 0.3, the mixing amount of the defoamer is 0.1%, and the mixing amount of the water reducer is 0.25%;
wherein, retarder is also doped, the doping amount of retarder is 0.06%, and retarder is sodium gluconate.
Example 9
The weight ratio of the cement-based grouting material, the rigid expanding agent, the cement and the anhydrite in the embodiment is 2.5:25:1, and the mortar ratio is 1:1.2, the water-gel ratio is 0.3, the mixing amount of the defoamer is 0.1%, and the mixing amount of the water reducer is 0.25%;
wherein, retarder is also mixed, the mixing amount of retarder is 0.12 percent, and retarder is sodium gluconate.
Example 10
The weight ratio of the cement-based grouting material, the rigid expanding agent, the cement and the anhydrite in the embodiment is 2.5:25:1, and the mortar ratio is 1:1.2, the water-gel ratio is 0.3, the mixing amount of the defoamer is 0.1%, and the mixing amount of the water reducer is 0.25%;
wherein, retarder is also mixed, the mixing amount of retarder is 0.18%, and retarder is sodium gluconate.
Example 11
The weight ratio of the cement-based grouting material, the rigid expanding agent, the cement and the anhydrite in the embodiment is 2.5:25:1, and the mortar ratio is 1:1.2, the water-gel ratio is 0.3, the mixing amount of the defoamer is 0.1%, and the mixing amount of the water reducer is 0.25%;
wherein, retarder is also doped, the doping amount of retarder is 0.24%, and retarder is sodium gluconate.
Example 12
The weight ratio of the cement-based grouting material, the rigid expanding agent, the cement and the anhydrite in the embodiment is 2.5:25:1, and the mortar ratio is 1:1.2, the water-gel ratio is 0.3, the mixing amount of the defoamer is 0.1%, and the mixing amount of the water reducer is 0.25%;
wherein, retarder is also mixed, the mixing amount of retarder is 0.06%, and retarder is tartaric acid.
Example 13
The weight ratio of the cement-based grouting material, the rigid expanding agent, the cement and the anhydrite in the embodiment is 2.5:25:1, and the mortar ratio is 1:1.2, the water-gel ratio is 0.3, the mixing amount of the defoamer is 0.1%, and the mixing amount of the water reducer is 0.25%;
wherein, retarder is also mixed, the mixing amount of retarder is 0.12%, and retarder is tartaric acid.
Example 14
The weight ratio of the cement-based grouting material, the rigid expanding agent, the cement and the anhydrite in the embodiment is 2.5:25:1, and the mortar ratio is 1:1.2, the water-gel ratio is 0.3, the mixing amount of the defoamer is 0.1%, and the mixing amount of the water reducer is 0.25%;
wherein, retarder is also mixed, the mixing amount of retarder is 0.18%, and retarder is tartaric acid.
Example 15
The weight ratio of the cement-based grouting material, the rigid expanding agent, the cement and the anhydrite in the embodiment is 2.5:25:1, and the mortar ratio is 1:1.2, the water-gel ratio is 0.3, the mixing amount of the defoamer is 0.1%, and the mixing amount of the water reducer is 0.25%;
wherein, retarder is also mixed, the mixing amount of retarder is 0.24%, and retarder is tartaric acid.
Example 16
The weight ratio of the cement-based grouting material, the rigid expanding agent, the cement and the anhydrite in the embodiment is 2.5:25:1, and the mortar ratio is 1:1.2, the water-gel ratio is 0.3, the mixing amount of the defoamer is 0.1%, and the mixing amount of the water reducer is 0.25%;
wherein, still mix retarder, retarder's dosage is 0.18%, retarder is sodium gluconate and tartaric acid's combination, sodium gluconate and tartaric acid's dosage proportion is 2:6.
example 17
The weight ratio of the cement-based grouting material, the rigid expanding agent, the cement and the anhydrite in the embodiment is 2.5:25:1, and the mortar ratio is 1:1.2, the water-gel ratio is 0.3, the mixing amount of the defoamer is 0.1%, and the mixing amount of the water reducer is 0.25%;
wherein, still mix retarder, retarder's dosage is 0.18%, retarder is the combination of sodium gluconate and tartaric acid, and sodium gluconate and tartaric acid's dosage proportion is 3:5.
example 18
The weight ratio of the cement-based grouting material, the rigid expanding agent, the cement and the anhydrite in the embodiment is 2.5:25:1, and the mortar ratio is 1:1.2, the water-gel ratio is 0.3, the mixing amount of the defoamer is 0.1%, and the mixing amount of the water reducer is 0.25%;
wherein, still mix retarder, retarder's dosage is 0.18%, retarder is the combination of sodium gluconate and tartaric acid, and sodium gluconate and tartaric acid's dosage proportion is 4:4.
example 19
The weight ratio of the cement-based grouting material, the rigid expanding agent, the cement and the anhydrite in the embodiment is 2.5:25:1, and the mortar ratio is 1:1.2, the water-gel ratio is 0.3, the mixing amount of the defoamer is 0.1%, and the mixing amount of the water reducer is 0.25%;
wherein, still mix retarder, retarder's dosage is 0.18%, retarder is the combination of sodium gluconate and tartaric acid, and sodium gluconate and tartaric acid's dosage proportion is 3:5, the mixing amount of the plastic expanding agent is 0.1 percent.
Example 20
The weight ratio of the cement-based grouting material, the rigid expanding agent, the cement and the anhydrite in the embodiment is 2.5:25:1, and the mortar ratio is 1:1.2, the water-gel ratio is 0.3, the mixing amount of the defoamer is 0.1%, and the mixing amount of the water reducer is 0.25%;
wherein, still mix retarder, retarder's dosage is 0.18%, retarder is the combination of sodium gluconate and tartaric acid, and sodium gluconate and tartaric acid's dosage proportion is 3:5, the mixing amount of the plastic expanding agent is 0.2 percent.
Example 21
The weight ratio of the cement-based grouting material, the rigid expanding agent, the cement and the anhydrite in the embodiment is 2.5:25:1, and the mortar ratio is 1:1.2, the water-gel ratio is 0.3, the mixing amount of the defoamer is 0.1%, and the mixing amount of the water reducer is 0.25%;
wherein, still mix retarder, retarder's dosage is 0.18%, retarder is the combination of sodium gluconate and tartaric acid, and sodium gluconate and tartaric acid's dosage proportion is 3:5, the mixing amount of the plastic expanding agent is 0.3 percent.
Referring to Table 1, the parameters corresponding to the above embodiments 1-21 of the present invention are shown:
TABLE 1,
Please refer to fig. 1 to 6, which are schematic diagrams showing the results of fluidity, strength and expansion ratio tested in examples 1 to 21 of the present invention.
In addition, under the conditions that the glue-sand ratio is 1:1.2, the water-cement ratio is 0.3, the mixing amount of the water reducer is 0.25% of the cementing material, the mixing amount of the defoaming agent is 0.10% of the cementing material, the proportion of sodium gluconate to tartaric acid is 3:5, the total mixing amount is 0.18% of the cementing material, and the mixing amount of the plastic expanding agent is 0.1%, the proportion of the components of the cementing material and the anhydrite are respectively: the cement-based grouting materials prepared by the method of the sulphoaluminate cement of 42.5R, the anhydrite=0:100:0, the sulphoaluminate cement of 42.5R, the anhydrite=2.5:97.5:1.25, the sulphoaluminate cement of 42.5R, the anhydrite=5:95:2.5 and the sulphoaluminate cement of 42.5R, the anhydrite=7.5:92.5:3.75 are tested for fluidity and strength under different parameters (namely the mixing amount of the sulphoaluminate cement is 0%, 2.5%, 5%, 7.5% and 10% respectively, and the mixing amount of the anhydrite is 0%, 1.25%, 2.5%, 3.75% and 5%) respectively, and the concrete results are shown in fig. 7.
As is evident from a combination of table 1 and fig. 1 to 7 above:
1. after the defoaming agent is mixed into the grouting material, the fluidity of the grouting material is obviously reduced. When the blending amount of the antifoaming agent is more than 0.1%, the fluidity change is small. Because the bubbles in the slurry can act as "balls", incorporation into the foam reduces the fluidity of the grouting material. The grouting slurry without the defoamer has more bubbles and serious bleeding, which indicates that the defoamer can improve the diseases.
2. The compressive strength of the grouting material increases with the addition of the antifoaming agent, but when the addition of the antifoaming agent is more than 0.1%, the strength increase is not significant. When the defoamer is not mixed, a layer of foam slurry is arranged on the surface of the hardened grouting material. Therefore, after the defoamer is mixed, a large amount of bubbles in the slurry can be eliminated, the compactness of the slurry is improved, and the compressive strength of the slurry is increased, but when the mixing amount is large, the performance of the slurry is not obviously improved any more.
3. With the addition of sodium gluconate, the initial fluidity was obviously increased, but at the sodium gluconate doping amount of 0.06%, a turning point appears, and the initial fluidity is suddenly reduced. That is because in the initial stage of hydration, because sodium gluconate promotes dissolution of C3A, CA and CA, and meanwhile, complexation with Ca2+ reduces the concentration of Ca2+, SO that gypsum accelerates dissolution and precipitation of SO42-, and further promotes formation of AFt; on the other hand, sodium gluconate adsorbs on the surface of mineral particles, inhibits the hydration of C3A, CA2, CA and C3S, forms a hydration diaphragm, and reduces the contact between particles, so that the slurry is delayed in setting. When the blending amount is gradually increased, the adsorption effect of sodium gluconate plays a main role, so that the initial fluidity is increased, but when the blending amount is 0.12%, the dissolution of C3A and gypsum is promoted by sodium gluconate, so that the initial fluidity change trend is different from other blending points.
4. When the amount of sodium gluconate added is small, the effect on the 1d strength of the grouting material is not great, but when the amount exceeds 0.06%, the 1d strength is decreased linearly. While the amount of sodium gluconate has little effect on the 3d and 28d intensities. When the sodium gluconate is doped in a small amount, the hydration of C3A, CA and CA is not affected basically, so ettringite is generated in a large amount, an initial structure is formed, and a certain strength is obtained. When the sodium gluconate dosage is more than 0.06%, the hydration of C3A, CA2, CA and C3S is inhibited due to the adsorption of sodium gluconate, so that the 1d strength is continuously reduced along with the increase of the sodium gluconate dosage. Sodium gluconate delays the formation of the structure, but has little influence on the later strength development in a certain doping amount, so that the 3d and 28d strengths are not changed greatly.
5. The initial fluidity of the slurry increased with the increase of the amount of tartaric acid, and when the amount of tartaric acid reached 0.12%, the fluidity was no longer increased. Tartaric acid is 2, 3-dihydroxysuccinic acid, which is a hydroxycarboxylic acid water reducer and has 4 strong polar groups of two hydroxyl groups and two carboxyl groups. The 4 strong polar groups are associated with water molecules through hydrogen bonds, so that a layer of solvated water film is formed on the surface of the cement hydration particles, and the progress of hydration is hindered. In addition, two hydroxyl groups of tartaric acid and free Ca2+ in the solution form an unstable complex, and the concentration of Ca2+ and the precipitation rate of Ca (OH) 2 are controlled in the initial stage of hydration. Because the tartaric acid molecule has simple structure, short main chain and strong group polarity, the formed solvated water film is more stable, and the retarding effect of the tartaric acid film is more remarkable than that of sodium gluconate.
6. The effect of tartaric acid on the strength of the grout 1d is consistent with the increase of the doping amount compared with that of sodium gluconate, but the strength of the grout 1d doped with tartaric acid is higher than that of the grout doped with sodium gluconate under the same doping amount. The strength of the long-term period, the strength of the 3d and the 28d is not related to the doping amount of the retarder, and the strength is always unchanged.
7. The retarding effect of the single retarder is often not as remarkable as that of the composite retarder, and especially for special mortar such as grouting materials, the 3d and even 1d strength is ensured because the operational time is ensured to be 30min, under the condition that both retarders are doped, the initial fluidity can reach an ideal state, but the fluidity of 30min is not lost in every proportion, and when the sodium gluconate ratio is larger than 5/8 of the total retarder, the loss of 30min begins to increase. Compared with single sodium gluconate, the method has better effect by adding only a small amount of tartaric acid.
8. The retarder composition has a great influence on the 1d strength, especially when the ratio of sodium gluconate to tartaric acid is 3:5, the intensity reaches the highest. In terms of the strength of the grouting material, the retarder is better in compound doping than any retarder. The 3d strength of the grouting material is not affected basically no matter the mixing proportion of retarder. For 28d, it can be seen that the strength of the blended grouting material is slightly higher than that of the grouting material blended with any one retarder alone.
9. When the mixing amount of the plastic expanding agent exceeds 0.1%, the initial fluidity and the 30min fluidity are both obviously improved, and the slurry is found to have obvious bleeding when the mixing amount of the plastic expanding agent reaches 0.3% in the test process.
10. When the blending amount of the plastic expanding agent exceeds 0.1%, the strength of 1d, 3d or 28d is reduced with the increase of the blending amount of the plastic expanding agent, and the reduction is large. Compared with the plastic expanding agent which is not mixed, the slurry strength 1d of the plastic expanding agent mixed with 0.2 percent and 0.3 percent is respectively reduced by 26.4 percent and 55.4 percent; the 3d intensity is respectively reduced by 13.9 percent and 18.0 percent; the 28d intensity was reduced by 7.2% and 20.1%, respectively. This is because the gas generated by the reaction increases gradually with the increase of the mixing amount of the plastic expanding agent, and the voids in the hardened slurry are more, which in turn reduces the strength. While the strength is not affected substantially when the content of the plastic expanding agent is within 0.1%.
11. For 3h early expansion, the slurry without plastic expansion agent did not expand, but instead contracted 0.12%. The 3h expansion rates of the slurries with the mixing amounts of 0.1%, 0.2% and 0.3% respectively reach 0.33%, 0.42% and 0.56%, and the expansion rate is obviously increased along with the increase of the mixing amount of the plastic expanding agent.
In summary, the cement-based grouting material provided by the invention has at least the following beneficial effects:
(1) The fluidity of the slurry is increased by the incorporation of the water reducer, and the better fluidity can be obtained without losing strength by setting the optimal incorporation amount.
(2) The foam is eliminated by adding the defoamer, so that the slurry structure is compact, when the water reducer is doped, the defoamer is added, and the defoamer is reasonably proportioned, so that the fluidity is good and the strength is not lost.
(3) The strength of the grouting material is ensured by adding the compound retarder in reasonable proportion.
(4) The cement-based grouting material has a larger expansion value by the incorporation of the plastic expansion agent with reasonable proportion, and the strength of the cement-based grouting material is ensured.
12. The initial fluidity of the grouting material gradually decreases with the increase of the sulphoaluminate cement, and the initial fluidity is reduced from 330mm to 310mm from the non-sulphoaluminate cement to the 10% doped amount. When the mixing amount of the sulphoaluminate cement is 0%, 2.5%, 5%, 7.5% and 10%, the 30min fluidity is 340mm, 330mm, 325mm and 0mm respectively, and when the mixing amount of the sulphoaluminate cement is less than or equal to 7.5%, the 30min fluidity can be maintained, and even the retarding phenomenon occurs. However, when the sulphoaluminate cement is more than 7.5%, the slurry loses plasticity and cannot flow after 30 minutes.
The strength of the slurry 1d increases with the increase of the sulphoaluminate cement, and when the blending amount of the sulphoaluminate cement reaches 7.5%, the maximum value reaches 30.4MPa, and when the blending amount reaches 10%, the strength is reduced. The grouting material has basically stable 3d strength, and when the aluminate cement mixing amount is 0%, 2.5%, 5%, 7.5% and 10%, the strengths are 58.4MPa, 60.3MPa, 61.2MPa and 59.2MPa respectively. The strength of the grouting material 28d basically decreases along with the increase of the aluminate cement doping amount, and when the aluminate doping amount is 2.5%, 5%, 7.5% and 10%, the strengths are 106.5MPa, 108.5MPa, 104.6MPa, 102.5MPa and 89.3MPa respectively. Especially when the aluminate cement content is 10%, the 28d strength is reduced by more than 16.2%. This is because when an expansive agent consisting of excessive sulfoaluminate cement and anhydrite is added, excessive ettringite is generated, and the ettringite is continuously crystallized to cause volume expansion of mortar, so that the internal structure of the grouting material is loosened, and the load bearing capacity is reduced.
Therefore, the strength of the grouting material after hardening is obviously improved only by doping a certain amount of sulphoaluminate cement and anhydrite as expanding agents. And the mixing amount of the aluminate cement of 7.5 percent is economical and effective.
The foregoing examples illustrate only a few embodiments of the invention and are described in detail herein without thereby limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.
Claims (6)
1. A cement-based grouting material, which is characterized by comprising the following raw materials:
cementing material, anhydrite, quartz sand, defoamer, water reducer, retarder and plastic expansion agent;
the defoaming agent is added in an amount of 0.05% -0.2% of the cementing material, the water reducing agent is added in an amount of 0.15% -0.3% of the cementing material, the plastic expansion agent is added in an amount of 0.1% -0.3% of the cementing material, the cementing material is sulphoaluminate cement and 42.5R cement, the sulphoaluminate cement is added in an amount of less than 10% of the cementing material, the anhydrite is added in an amount of less than 5% of the cementing material, the retarder is added in an amount of 0.06% -0.24% of the cementing material, the retarder is a combination of sodium gluconate and tartaric acid, and the mixing ratio of the sodium gluconate to the tartaric acid is 3:5.
2. The cement-based grouting material of claim 1, wherein the defoaming agent is added in an amount of 0.1% of the cementing material.
3. The cement-based grouting material of claim 1, wherein the water reducing agent is added in an amount of 0.25% of the cementing material.
4. The cement-based grouting material of claim 1, wherein the plastic expanding agent is added in an amount of 0.1% of the cementing material.
5. The cement-based grouting material of claim 1, wherein the retarder is incorporated in an amount of 0.18% of the cementing material.
6. The cement-based grouting material of claim 1, wherein the cement-based grouting material has a cement-to-sand ratio of 1:1.2, the cement-based grouting material has a water-to-cement ratio of 0.3, the sulfoaluminate cement is added in an amount of 7.5% of the cementing material, and the anhydrite is added in an amount of 3.75% of the cementing material.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103482926A (en) * | 2013-09-02 | 2014-01-01 | 苏州科技学院 | Cement-based no-shrinkage grouting material |
| CN104844122A (en) * | 2015-06-08 | 2015-08-19 | 北京建筑大学 | Cement grouting material |
| CN107954669A (en) * | 2018-01-23 | 2018-04-24 | 云南森博混凝土外加剂有限公司 | A kind of grouting material and preparation method thereof |
| CN111574099A (en) * | 2020-05-08 | 2020-08-25 | 中国铁道科学研究院集团有限公司铁道建筑研究所 | Hollow anchor rod grouting material additive, preparation method and application |
-
2022
- 2022-07-19 CN CN202210848870.9A patent/CN115385615B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103482926A (en) * | 2013-09-02 | 2014-01-01 | 苏州科技学院 | Cement-based no-shrinkage grouting material |
| CN104844122A (en) * | 2015-06-08 | 2015-08-19 | 北京建筑大学 | Cement grouting material |
| CN107954669A (en) * | 2018-01-23 | 2018-04-24 | 云南森博混凝土外加剂有限公司 | A kind of grouting material and preparation method thereof |
| CN111574099A (en) * | 2020-05-08 | 2020-08-25 | 中国铁道科学研究院集团有限公司铁道建筑研究所 | Hollow anchor rod grouting material additive, preparation method and application |
Non-Patent Citations (4)
| Title |
|---|
| 曹大燕等，中国建材工业出版社.《土木工程检测鉴定与加固改造新进展——全国建筑物检测鉴定与加固改造第十二届学术交流会论文集》.中国建材工业出版社,2014,(第1版),第685-688页. * |
| 朱祥等.功能性添加剂对水泥基灌浆料性能的影响.《粉煤灰》.2013,第25卷(第3期),第34-39页. * |
| 李东旭，中国矿业大学出版社.《地面自流平材料改性及应用技术研究》.中国矿业大学出版社,2016,(第1版),第5页. * |
| 许彦明等.水泥基微膨胀灌浆材料性能研究.《粉煤灰》.2016,第28卷(第2期),第43-46页. * |
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