CN113620678A - Grouting material and preparation method thereof - Google Patents
Grouting material and preparation method thereof Download PDFInfo
- Publication number
- CN113620678A CN113620678A CN202111113937.6A CN202111113937A CN113620678A CN 113620678 A CN113620678 A CN 113620678A CN 202111113937 A CN202111113937 A CN 202111113937A CN 113620678 A CN113620678 A CN 113620678A
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- parts
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- grouting material
- slurry
- silica fume
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Classifications
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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
- C04B28/04—Portland cements
-
- 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
- C04B2111/20—Resistance against chemical, physical or biological attack
-
- 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
Abstract
The grouting material comprises the following components in parts by weight: 94.6-96.7 parts of a cementing material; 0.2-0.4 part of polycarboxylic acid water reducing agent; 0.02-0.04 part of defoaming agent; 0.01-0.03 part of anti-settling water-retaining agent; 3-5 parts of a concrete expanding agent; 0.03-0.05 part of plastic expanding agent; the cementing material comprises the following components: 82-90 parts of Portland cement; 5-10 parts of silica fume; 1-5 parts of superfine stone powder; 0-3 parts of fly ash, and is prepared by the following method: 1) taking limestone, mixing with gypsum and grinding aid, grinding to specific surface area of 1000-2And/kg, obtaining superfine stone powder, wherein the addition amount of the gypsum is 0.3-0.5%, the grinding aid is a mixture of calcium lignosulphonate and silica fume, and the mass ratio of the calcium lignosulphonate to the silica fume is 3: 47, the addition amount of the grinding aid is 0.3% -0.5%; 2) taking materials according to a proportion, adding the materials into mixing equipment, uniformly mixing, and carrying out homogenization treatment to obtain the grouting material. The grouting material of the invention has excellent fluidity, water retention property and cohesiveness, and improves the grout bodyThe compactness and the filling degree of the slurry can reduce the shrinkage of the slurry in the plastic stage and the shrinkage of the slurry after hardening.
Description
Technical Field
The invention relates to the field of prestressed concrete, in particular to a grouting material and a preparation method thereof.
Background
With the gradual maturity of prestressed concrete technology, prestressed concrete structural members are widely applied to building engineering and bridge engineering. Prestressed beam pipeline grouting is an extremely important process in a post-tensioning structure construction process, is more and more concerned by students and engineering personnel, and once the pipeline grouting has a quality problem, the safety, durability and reliability of a prestressed structural member are seriously influenced.
At present, the grouting material used for grouting the prestressed beam pipeline which is generally applied is pure cement slurry, and raw materials such as cement, water, a water reducing agent, an expanding agent and the like are adopted for field preparation during construction. The traditional method for preparing the grouting material on site generally has the problems of poor compatibility of various additives, poor adaptability of cement and a water reducing agent and the like, so that the pipeline grouting has more serious quality problems, such as: the slurry has poor stability, easy segregation and delamination, bleeding, poor fluidity and large loss of fluidity, the slurry is easy to block the pipe during grouting, the slurry is not firmly bonded with the prestressed tendons, the slurry is not compact after hardening, the pore channel is not full, and the like. The problems not only affect the construction progress of the project, but also directly affect the durability and the safety of the building project, the bridge project and the like.
Therefore, how to design a grouting material with excellent performance is a problem to be solved urgently by those skilled in the art.
Disclosure of Invention
One of the purposes of the invention is to provide a grouting material which has excellent fluidity, water retention and cohesiveness, improves the compactness and the filling degree of the slurry, reduces the shrinkage of the slurry in a plastic stage and the shrinkage of the slurry after hardening, is especially suitable for railway concrete post-tensioned prestressed beam pipeline grouting engineering, and can effectively solve the problems of poor fluidity, large fluidity loss, poor water retention, easy bleeding and layering, large system shrinkage, low breaking strength and the like in the traditional grouting engineering.
The invention also aims to provide the preparation method of the grouting material, the process is simple, and the prepared grouting material is particularly suitable for railway concrete engineering.
The technical scheme for realizing one purpose of the invention is as follows: the grouting material comprises the following components in parts by weight:
94.6-96.7 parts of a cementing material;
0.2-0.4 part of polycarboxylic acid water reducing agent;
0.02-0.04 part of defoaming agent;
0.01-0.03 part of anti-settling water-retaining agent;
3-5 parts of a concrete expanding agent;
0.03-0.05 part of plastic expanding agent;
the cementing material comprises the following components:
82-90 parts of Portland cement;
5-10 parts of silica fume;
1-5 parts of superfine stone powder;
0-3 parts of fly ash.
Preferably, the grouting material comprises the following components in parts by weight:
95-96 parts of a cementing material;
0.3 part of polycarboxylic acid water reducing agent;
0.03 part of defoaming agent;
0.02 part of anti-settling water-retaining agent;
4 parts of a concrete expanding agent;
0.04 part of plastic expanding agent;
the cementing material comprises the following components:
85 parts of Portland cement;
7 parts of silica fume;
3 parts of superfine stone powder;
0-3 parts of fly ash.
Furthermore, the defoaming agent is a solid polyether defoaming agent and is a modified polyether high-efficiency powder defoaming agent.
Further, the anti-settling water retaining agent is methyl cellulose ether and/or hydroxypropyl methyl cellulose ether, and the viscosity is 50000-100000mPa & s.
Further, the concrete expanding agent is a standard II type calcium oxide expanding agent or a calcium oxide-calcium sulphoaluminate expanding agent.
Furthermore, the silicon ash is dust which is obtained by discharging and collecting the silicon ash through a flue when ferrosilicon alloy or industrial silicon is smelted.
Further, the ultrafine stone powder is prepared by grinding limestone until the specific surface area is 1000-1500m2Powder material/kg.
Furthermore, the fly ash is obtained by calcining anthracite or bituminous coal and collecting the calcined coal ash.
The second technical means for achieving the object of the present invention is a method for preparing the grouting material, comprising the steps of:
1) taking limestone, mixing with gypsum and grinding aid, grinding to specific surface area of 1000-2And/kg, obtaining superfine stone powder for later use, wherein the addition amount of the gypsum is 0.3-0.5%, the grinding aid is a mixture of calcium lignosulphonate and silica fume, and the mass ratio of the calcium lignosulphonate to the silica fume is 3: 47, the addition amount of the grinding aid is 0.3% -0.5%;
2) taking the materials according to the proportion of the components, adding the materials into mixing equipment, uniformly mixing, and homogenizing to obtain the grouting material.
Adopt above-mentioned technical scheme to have following beneficial effect:
1. the grouting material provided by the invention is designed by a scientific and reasonable formula, particularly aiming at the grouting engineering of railway concrete post-tensioned prestressed beam pipelines, the newly-mixed grouting material has good fluidity, no bleeding or segregation and layering, small fluidity loss, fluidity within 25s in 60min, and good workability and homogeneity in the construction process. The problems of poor fluidity, large fluidity loss, poor water retention, easy bleeding and layering, large system shrinkage, low breaking strength and the like of the traditional grouting material are solved, the grouting material has good fluidity, water retention and cohesiveness, good compactness and filling degree of the slurry, small shrinkage of the slurry in a plastic stage and small shrinkage of the slurry after hardening, the breaking strength and the compressive strength of the slurry after hardening can be effectively improved, the breaking strength of 7d and 28d can respectively reach more than 10MPa and 12MPa, the compressive strength of 7d and 28d can respectively reach more than 50MPa and 60MPa, and the durability of building engineering, bridge engineering and the like is improved.
2. The invention provides a grouting material, wherein the polycarboxylic acid water reducing agent is used for improving the fluidity of the grouting material and comprisesIf the content is too high, the problems of bleeding, layering and the like of the slurry can occur; the defoaming agent is used for controlling the gas content of the slurry and improving the compactness of the slurry, if the content is too low, the problems of high gas content of the slurry, low compressive strength and the like can occur, and if the content is too high, the problems of low flow rate, poor fluidity, large fluidity loss and the like of the slurry can occur; the anti-settling water-retaining agent is used for avoiding the problems of layering, settling, bleeding and the like of slurry, if the content is too low, the problems of unqualified indexes of the bleeding, layering and bleeding rate of the slurry can occur, if the content is too high, the problems of low flow rate, poor fluidity, large loss of fluidity and the like of the slurry can occur, and the pressure bleeding rate of the slurry can be effectively controlled by controlling the viscosity of the anti-settling water-retaining agent to be 50000-100000mPa & s; the plastic expanding agent forms uniform and compact tiny air holes in an alkaline environment, so that a system generates tiny expansion in a plastic stage, the problem of shrinkage of slurry in the plastic stage is effectively solved, the fullness of the slurry is improved, if the content is too low, the free expansion rate of the pressure slurry is low or unqualified, and if the content is too high, the problems of low slurry flow rate, poor fluidity, large fluidity loss and the like occur; the concrete expanding agent is used for quickly generating micro-expansion and compensating shrinkage after the slurry is hardened, effectively solving the problems of early self-shrinkage, chemical shrinkage and the like of the slurry after the slurry is hardened, having small dependence on maintenance conditions, and having the problems of low or unqualified expansion rate limit, large shrinkage, easy cracking and the like of the pressure slurry if the content is too low, and having the problems of low or unqualified compression strength, too high expansion rate limit and even expansion cracking and the like if the content is too high; the silicon ash is mainly dust which is obtained by discharging and collecting the silicon iron alloy or industrial silicon through a flue during smelting, and is a powder material taking amorphous silicon dioxide as a main component, and is used for improving the water retention property and the compactness of slurry and improving the folding strength and the compressive strength of the slurry at the early stage and the late stage after hardening, if the content is too low, the problems of slurry bleeding, layering, low compressive strength or disqualification and the like can occur, and if the content is too high, the problems of low slurry flow rate, poor fluidity, large fluidity loss and the like can occur; the superfine stone powder is used for improving the fluidity and water retention of slurry, and if the content is too low, the superfine stone powder can be used for improving the fluidity and water retention of the slurryThe problems of bleeding of slurry, slow flow rate, poor fluidity, large loss of fluidity and the like occur, if the content is too high, the problems of low compressive strength or unqualified compressive strength and the like occur, and the specific surface area of the superfine stone powder is controlled to be 1000-1500m2The flow rate of the slurry can be effectively improved, and the loss of fluidity can be reduced; the fly ash is collected by calcining anthracite or bituminous coal and is used for improving the durability of slurry, if the content is too low, the later strength of the pressure slurry is slightly increased, and if the content is too high, the problems that the pressure strength of the pressure slurry is low or unqualified and the like can occur.
3. The grouting material provided by the invention has strong wrapping effect on the prestressed tendons during grouting, and can effectively ensure the safety, durability and reliability of the prepared prestressed structural member.
In the invention, the weight parts are g, kg or t.
The following is a further description with reference to specific examples.
Detailed Description
In the invention, the cement in the cementing material is 42.5-grade ordinary portland cement of Chongqing platform cement company Limited, and the specific surface area is 350m2The initial setting time is 155min, the 28d compressive strength is 49.2MPa, the 28d flexural strength is 8.6MPa, the silica fume is the silica fume for the concrete of the outsourcing Chongqing silicon micro-special building material Co, the water content is 1.7 percent, and the specific surface area is 19900m2110% of 7d activity index, 6.8% of fineness (0.045mm screen residue), 0.2% of water content and 75% of strength activity index, wherein the fly ash is purchased from class F II fly ash of Chongqing Lopa fossil power plant, the limestone is taken and mixed with gypsum and grinding aid, and the mixture is ground until the specific surface area is 1000-1500 m-2The ultrafine stone powder is obtained, wherein the addition amount of the gypsum is 0.3-0.5 percent of the addition amount of the gypsum, the grinding aid is a mixture of calcium lignosulfonate and silica fume, 6 parts of calcium lignosulfonate and 94 parts of silica fume are added, the addition amount of the grinding aid is 0.3-0.5 percent, and the specific surface area of the home-made ultrafine stone powder is 1340m2Per kg, the water content is 0.3 percent, the calcium carbonate content is 87 percent, and the 28d compressive strength ratio is 75 percent; the polycarboxylic acid water reducing agent is white powder of Shandong sunshine Guangxi building materials Co., LtdThe conversion rate of the polycarboxylic acid water reducing agent is 92.6 percent, the molecular weight is 3.6 ten thousand, the water content is 2 percent, and the water reducing rate is 38 percent; the defoaming agent is a white powdery modified polyether high-efficiency powder defoaming agent (A-406) of Suzhou Xingbang chemical admixture limited company, the fineness is 3 percent (0.315mm screen residue), and the water content is 6.6 percent; the anti-settling water-retaining agent is white powdery hydroxypropyl methyl cellulose ether (HPMC) of Shandong Gomais chemical Co., Ltd, the viscosity is 50000mPa & s, the fineness is 6% (0.212mm screen residue), and the pH value is 5; the concrete expanding agent is an off-white powdery II type calcium oxide expanding agent of Chongqing Sansheng industry Co Ltd, and the specific surface area is 280m2The expansion rate of the water is limited by 7 days to be 0.056 percent and the compressive strength of the water is 47.8MPa after 28 days; the plastic expanding agent is a yellow powdery plastic expanding agent purchased from open building materials Co., Ltd, Xian, with the water content of 0.2 percent and the free expansion rate of 0.7 percent after 3 hours.
Example 1
The grouting material comprises the following components in parts by weight: 95.5 parts of a cementing material; 0.4 part of polycarboxylic acid water reducing agent; 0.04 part of a defoaming agent; 0.02 part of anti-settling water-retaining agent; 4 parts of a concrete expanding agent; 0.04 part of plastic expanding agent; the cementing material comprises the following components: 90 parts of Portland cement; 7 parts of silica fume; 2 parts of superfine stone powder; 1 part of fly ash.
The materials are added into mixing equipment to be uniformly mixed, and the pressure slurry is obtained after homogenization treatment.
The method is detected according to the standard TB/T3192 plus 2008 & lttechnical conditions for grouting the prestressed concrete beam pipeline by the railway post-tensioning method & lt & gt, the water-cement ratio is 0.33, and the detection data is as follows:
example 2
The grouting material comprises the following components in parts by weight: 96.61 parts of a cementing material; 0.3 part of polycarboxylic acid water reducing agent; 0.03 part of defoaming agent; 0.02 part of anti-settling water-retaining agent; 3 parts of a concrete expanding agent; 0.04 part of plastic expanding agent; the cementing material comprises the following components: 84 parts of Portland cement; 8 parts of silica fume; 5 parts of superfine stone powder; 3 parts of fly ash.
The materials are added into mixing equipment to be uniformly mixed, and the pressure slurry is obtained after homogenization treatment.
The method is detected according to the standard TB/T3192 plus 2008 & lttechnical conditions for grouting the prestressed concrete beam pipeline by the railway post-tensioning method & lt & gt, the water-cement ratio is 0.33, and the detection data is as follows:
therefore, the product of the invention meets the industrial standard.
Claims (9)
1. The grouting material is characterized by comprising the following components in parts by weight:
94.6-96.7 parts of a cementing material;
0.2-0.4 part of polycarboxylic acid water reducing agent;
0.02-0.04 part of defoaming agent;
0.01-0.03 part of anti-settling water-retaining agent;
3-5 parts of a concrete expanding agent;
0.03-0.05 part of plastic expanding agent;
the cementing material comprises the following components:
82-90 parts of Portland cement;
5-10 parts of silica fume;
1-5 parts of superfine stone powder;
0-3 parts of fly ash.
2. The grouting material of claim 1, comprising the following components in parts by weight:
95-96 parts of a cementing material;
0.3 part of polycarboxylic acid water reducing agent;
0.03 part of defoaming agent;
0.02 part of anti-settling water-retaining agent;
4 parts of a concrete expanding agent;
0.04 part of plastic expanding agent;
the cementing material comprises the following components:
85 parts of Portland cement;
7 parts of silica fume;
3 parts of superfine stone powder;
0-3 parts of fly ash.
3. The grouting material of claim 1 or 2, wherein the defoaming agent is a solid polyether defoaming agent, preferably a modified polyether high-performance powder defoaming agent.
4. The grouting material as claimed in claim 1 or 2, wherein the anti-settling water retaining agent is methyl cellulose ether and/or hydroxypropyl methyl cellulose ether, and the viscosity is 50000-100000 mPa-s.
5. A grouting material as claimed in claim 1 or 2, characterised in that the concrete expansion agent is a standard type ii calcium oxide expansion agent or calcium oxide-calcium sulphoaluminate expansion agent.
6. The grouting material according to claim 1 or 2, wherein the silica fume is collected dust discharged from a flue during ferrosilicon or industrial silicon smelting.
7. The grouting material as claimed in claim 1 or 2, wherein the ultrafine stone powder is prepared by grinding limestone to a specific surface area of 1000-1500m2Powder material/kg.
8. The grouting material according to claim 1 or 2, wherein the fly ash is obtained by calcining anthracite or bituminous coal and collecting the calcined coal ash.
9. A method for preparing a press slurry according to claim 1 or 2, characterized by comprising the steps of:
1) taking limestone, mixing with gypsum and grinding aid, grinding to specific surface area of 1000-2And/kg, obtaining superfine stone powder for later use, wherein the addition amount of the gypsum is 0.3-0.5%, the grinding aid is a mixture of calcium lignosulphonate and silica fume, and the mass ratio of the calcium lignosulphonate to the silica fume is 3: 47, the addition amount of the grinding aid is 0.3% -0.5%;
2) taking materials according to the proportioning of each component in claim 1 or 2, adding the materials into a mixing device, uniformly mixing, and homogenizing to obtain the pressure slurry.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202111113937.6A CN113620678A (en) | 2021-09-23 | 2021-09-23 | Grouting material and preparation method thereof |
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| CN202111113937.6A CN113620678A (en) | 2021-09-23 | 2021-09-23 | Grouting material and preparation method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114920521A (en) * | 2022-05-31 | 2022-08-19 | 中德新亚建筑材料有限公司 | Prestressed pipeline grouting material and preparation method thereof |
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Application publication date: 20211109 |