CN108455889B - Phosphoaluminate cement-based coral aggregate reinforced slurry capable of curing chloride ions - Google Patents
Phosphoaluminate cement-based coral aggregate reinforced slurry capable of curing chloride ions Download PDFInfo
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- CN108455889B CN108455889B CN201810131457.4A CN201810131457A CN108455889B CN 108455889 B CN108455889 B CN 108455889B CN 201810131457 A CN201810131457 A CN 201810131457A CN 108455889 B CN108455889 B CN 108455889B
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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
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/10—Coating or impregnating
- C04B20/12—Multiple coating or impregnating
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Abstract
The invention discloses a phosphoaluminate cement-based coral aggregate reinforced slurry capable of curing chloride ions, which comprises a penetrating slurry and a coating slurry, wherein the penetrating slurry comprises the following components in percentage by mass: 70-85% of phosphoaluminate cement, 1-4% of a permeable crystalline material, 10-25% of a clay mineral admixture, 0.4-2% of a coagulation regulator and 0.6-0.75% of water-cement ratio; the coating slurry comprises the following components in percentage by mass: 70-85% of phosphoaluminate cement, 10-25% of clay mineral admixture, 0.4-2% of coagulation regulator and 0.5-0.6% of water-cement ratio; the coral aggregate which can be directly applied can be obtained after the treatment of the penetrating slurry and the coating slurry, two problems which troubles the direct application of the coral aggregate are solved, and the coral aggregate can be applied to island house buildings, military buildings and the like in ocean areas.
Description
Technical Field
The invention provides a phosphoaluminate cement-based coral aggregate reinforced slurry capable of curing chloride ions.
Background
For engineering construction on islands far away from land, all the required raw materials need to be transported from the continent, so the transportation cost is very high. If local materials can be used, the problem of raw materials can be solved. China has wide sea areas, and a plurality of reef islands consisting of coral reefs are distributed in the sea areas. Research shows that the main components of the coral reef are aragonite and high-magnesium calcite, and the total content of calcium carbonate reaches over 96 percent. If the coral reefs are prepared into aggregates by a series of manufacturing processes for preparing concrete, the coral reefs have very important practical significance for engineering construction on islands in China. A great deal of research work has been done by researchers to the direct utilization of coral aggregates so far, for example, patent application No. CN201610973322.3 is a saltpetering-resistant seawater coral aggregate concrete block, the invention adopts the coral aggregate salt-fixing agent to solidify the erosive ions in the coral, the invention can realize indirect application of the coral as the aggregate, but does not directly treat the aggregate, so that the application range of the coral aggregate is reduced; the patent application No. CN20160274695.1 discloses a seawater coral aggregate concrete, which eliminates the erosive ions carried by the coral aggregates and the air bubbles generated by the slurry extruding the gaps of the coral aggregates in the concrete production through additives such as salt fixing agent, defoaming agent, etc., but the method has limited effect and can not solve the problems fundamentally. The invention provides the coral aggregate reinforced slurry of the phosphoaluminate cement-based curable chloride ions, which can fundamentally solve the problems, can solve two problems of application of the coral aggregates, can cure the reinforced coral aggregates, and has extremely wide application prospect.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a phosphoaluminate cement-based coral aggregate reinforced slurry capable of curing chloride ions.
The invention adopts the following technical scheme:
a kind of phosphorus aluminate cement base can solidify the coral aggregate reinforcement slurry of the chloride ion, it includes permeating slurry and 22 covers two parts of slurry; the permeable slurry comprises the following components in percentage by mass: 70-85% of phosphoaluminate cement, 1-4% of a permeable crystalline material, 10-25% of a clay mineral admixture, 0.4-2% of a coagulation regulator and 0.6-0.75% of water-cement ratio; the coating slurry comprises the following components in percentage by mass: 70-85% of phosphoaluminate cement, 10-25% of clay mineral admixture, 0.4-2% of coagulation regulator and 0.5-0.6% of water-cement ratio.
The clay mineral admixture is at least one of gold tailings and white tungsten tailings.
The specific surface area of the gold ore tailings is more than 298m2And/kg, the percent screen residue of the scheelite tailing with 200-mesh sieve is less than 5 percent.
The strength grade of the phosphoaluminate cement is not lower than 42.5 grade, and the surface area is more than 320m2/kg。
The specific use method of the reinforced slurry is as follows:
1) injecting the prepared penetrating slurry into a slurry pool, putting the coral aggregate to be treated into the slurry pool to be soaked for 5min, and then fishing out the coral aggregate from the slurry pool;
2) standing the fished aggregate for 1-2 h, and carrying out the next step after air drying, wherein the thickness of the coating of the permeating slurry is 0.3-0.5 mm;
3) injecting the coating slurry into a spraying mortar machine, putting the coral aggregate obtained by the treatment in the step 2) into a vibrating screen, and spreading to be the thickness of one particle;
4) starting a vibrating screen, starting spraying the coating slurry, and changing the next batch after 1 min; and standing the treated coral aggregate for 30 min-1 h, wherein the coating thickness of the coating slurry is 0.5 mm-1 mm, and the coral aggregate is the phosphoaluminate cement-based chloride ion-curable coral aggregate.
The permeable crystallization material is a product of XYPEX series, and comprises cement, quartz sand, water and active chemical substances. The present invention utilizes a crystalline permeable material of the XYPEX series, purchased from Canada, which comprises the constituents of cement, silica sand, water and active chemicals.
The infiltration slurry used in the invention has larger water-cement ratio and good fluidity, can effectively fill up gaps of coral aggregates, and the XYPEX series infiltration crystalline material in the infiltration slurry contains cement, quartz sand, active chemical substances and water, and the cement, the quartz sand and the clayey mineral admixture in the infiltration slurry can be used as reactants to provide Ca2+And SiO3 2-Can react with the unhydrated or insufficiently hydrated cementing material to generate C-S-H gel, and can effectively fill the remaining tiny pores; the active chemical substances in the permeable crystallization material comprise a composite additive (consisting of a water reducing agent, a water repellent and an expanding agent) and an anion catalyst (containing active SiO)3 2-Ion), the composite additive is polymerized and grown under certain conditions after being dissolved in water, or is chemically reacted with ions in a pore solution inside concrete to generate crystals insoluble in water to block cracks and capillary pores, or is reacted with substances such as calcium hydroxide, aluminum hydroxide and the like in the concrete to form insoluble acicular ettringite crystals, and the additive can be greatly consumed in the initial stage of hydration reaction; the active anion catalyst can generate chelation with calcium ions in concrete to form a short-term soluble complex, but is easy to be seized by silicate and aluminate to form more stable insoluble substances, then the active substances can form new free radicals to be chelated with the calcium ions again, and then the process is repeated, so that the concrete water-soluble calcium-insoluble calcium-based composite material not only can be used for preparing concrete water-soluble concreteCan promote hydration, promote chemical reaction under low reaction concentration to generate C-S-H gel, and can also effectively fill the place where the cement paste is not filled. In conclusion, the penetrating slurry can more effectively fill the pores in the coral aggregates and improve the mechanical properties of the coral aggregates.
The coating slurry can fix chloride ions in the coral aggregates in two ways, one is physical adsorption: the micropores in the cement paste can fix chloride ions in a physical adsorption mode; the other is a chemical reaction method: the main component of the coating slurry is phosphoaluminate cement containing a large amount of calcium aluminate, and the clay mineral admixture also contains a large amount of aluminum oxide which can react with chloride ions to generate Friedel salt (3 Cao. Al)2O3·CaCl2·10H2O) and Kuzel salt (3 Cao. Al)2O3·0.5CaSO4·0.5CaCl2·10H2O), a large amount of chloride ions can be solidified, and simultaneously, the pore structure of the slurry can be optimized and the compactness can be improved by generating the two salts. And because hydration products are generated, the coating slurry can be combined with the coral aggregate more tightly and is not easy to fall off, the main component in the coating slurry is the phosphoaluminate cement, the phosphoaluminate cement has high strength, and the strength of the coral aggregate can be improved after the coral aggregate is coated. The main component of the infiltration slurry is also an aluminophosphate cement, and the chloride ions can be cured in the aggregate.
The invention has the advantages that: after the coral aggregate is subjected to strengthening treatment by the coating slurry and the penetrating slurry, the mechanical strength of the coral aggregate is remarkably improved, the test result of the optimal crushing value is less than or equal to 18 percent, the coral aggregate can be directly used as a common aggregate, and the application prospect is very wide. Compared with the original aggregate, the coral aggregate has the advantages that chloride ions and most of gaps inside the coral aggregate are removed, two major problems which bother the direct application of the coral aggregate are solved, and the application prospect is wide.
Detailed Description
The present invention will be described in further detail with reference to specific examples.
Example 1
A kind of phosphorus aluminate cement base can solidify the coral aggregate reinforcement slurry of the chloride ion, it includes permeating slurry and coating slurry two parts; the osmotic slurry consists of phosphoaluminate cement, clay mineral admixture, osmotic crystallization material and coagulation regulator; the coating slurry consists of phosphoaluminate cement, clay mineral admixture and coagulation regulator; the concrete mass percentage composition is as follows:
wherein the penetrating slurry adopts a water-cement ratio of 0.6, the coating slurry adopts a water-cement ratio of 0.5, the strength grade of the phosphoaluminate cement is not lower than 42.5 grade, and the surface area is more than 320m2/kg。
The permeable crystallization material is a product of XYPEX series, and comprises cement, quartz sand, water and active chemical substances.
The clay mineral admixture is gold tailings and scheelite tailings mixed according to the weight ratio of 1: 1 mass ratio.
The coagulation regulator is prepared by mixing sodium lignosulfonate, boric acid and citric acid in any ratio.
The specific strengthening method of the coral aggregate is as follows:
1) injecting the prepared penetrating slurry into a slurry pool, putting the coral aggregate to be treated into the slurry pool to be soaked for 5min, and then fishing out the coral aggregate from the slurry pool;
2) standing the fished aggregate for 1-2 h, and carrying out the next step after air drying, wherein the thickness of the coating of the permeating slurry is 0.3-0.5 mm;
3) injecting the coating slurry into a spraying mortar machine, putting the coral aggregate obtained by the treatment in the step 2) into a vibrating screen, and spreading to be the thickness of one particle;
4) starting a vibrating screen, starting spraying the coating slurry, and changing the next batch after 1 min; and standing the treated coral aggregate for 30 min-1 h, wherein the coating thickness of the coating slurry is 0.5 mm-1 mm, and the coral aggregate is the phosphoaluminate cement-based chloride ion-curable coral aggregate.
And finally, screening out the grains larger than 19.0mm and smaller than 9.50mm from the coral aggregate prepared by the strengthening method, weighing 3 groups of 3000g of samples of the rest grains for a crushing value test, and finally obtaining the crushing value less than or equal to 19% through test calculation. And the crushing value of the untreated directly selected coral aggregates is less than or equal to 32 percent.
Example 2
A kind of phosphorus aluminate cement base can solidify the coral aggregate reinforcement slurry of the chloride ion, it includes permeating slurry and coating slurry two parts; the osmotic slurry consists of phosphoaluminate cement, clay mineral admixture, osmotic crystallization material and coagulation regulator; the coating slurry consists of phosphoaluminate cement, clay mineral admixture and coagulation regulator; the concrete mass percentage composition is as follows:
wherein, the penetrating slurry adopts a water-cement ratio of 0.65, the coating slurry adopts a water-cement ratio of 0.55, the strength grade of the phosphoaluminate cement is not lower than 42.5 grade, and the surface area is more than 320m2/kg。
The permeable crystallization material is a product of XYPEX series, and comprises cement, quartz sand, water and active chemical substances.
The clay mineral admixture is gold ore tailings.
The coagulation regulator is prepared by mixing sodium lignosulfonate, boric acid and citric acid in any ratio.
The specific strengthening method of the coral aggregate is as follows:
1) injecting the prepared penetrating slurry into a slurry pool, putting the coral aggregate to be treated into the slurry pool to be soaked for 5min, and then fishing out the coral aggregate from the slurry pool;
2) standing the fished aggregate for 1-2 h, and carrying out the next step after air drying, wherein the thickness of the coating of the permeating slurry is 0.3-0.5 mm;
3) injecting the coating slurry into a spraying mortar machine, putting the coral aggregate obtained by the treatment in the step 2) into a vibrating screen, and spreading to be the thickness of one particle;
4) starting a vibrating screen, starting spraying the coating slurry, and changing the next batch after 1 min; and standing the treated coral aggregate for 30 min-1 h, wherein the coating thickness of the coating slurry is 0.5 mm-1 mm, and the coral aggregate is the phosphoaluminate cement-based chloride ion-curable coral aggregate.
And finally, screening out the grains larger than 19.0mm and smaller than 9.50mm from the coral aggregate prepared by the strengthening method, weighing 3 groups of 3000g of samples of the rest grains for a crushing value test, and finally obtaining the crushing value less than or equal to 19% through test calculation. And the crushing value of the untreated directly selected coral aggregates is less than or equal to 32 percent.
Example 3
A kind of phosphorus aluminate cement base can solidify the coral aggregate reinforcement slurry of the chloride ion, it includes permeating slurry and coating slurry two parts; the osmotic slurry consists of phosphoaluminate cement, clay mineral admixture, osmotic crystallization material and coagulation regulator; the coating slurry consists of phosphoaluminate cement, clay mineral admixture and coagulation regulator; the concrete mass percentage composition is as follows:
wherein the penetrating slurry adopts a water-cement ratio of 0.75, the coating slurry adopts a water-cement ratio of 0.6, the strength grade of the phosphoaluminate cement is not lower than 42.5 grade, and the surface area is more than 320m2/kg。
The permeable crystallization material is a product of XYPEX series, and comprises cement, quartz sand, water and active chemical substances.
The clay mineral admixture is white tungsten tailings.
The coagulation regulator is prepared by mixing sodium lignosulfonate, boric acid and citric acid in any ratio.
The specific strengthening method of the coral aggregate is as follows:
1) injecting the prepared penetrating slurry into a slurry pool, putting the coral aggregate to be treated into the slurry pool to be soaked for 5min, and then fishing out the coral aggregate from the slurry pool;
2) standing the fished aggregate for 1-2 h, and carrying out the next step after air drying, wherein the thickness of the coating of the permeating slurry is 0.3-0.5 mm;
3) injecting the coating slurry into a spraying mortar machine, putting the coral aggregate obtained by the treatment in the step 2) into a vibrating screen, and spreading to be the thickness of one particle;
4) starting a vibrating screen, starting spraying the coating slurry, and changing the next batch after 1 min; and standing the treated coral aggregate for 30 min-1 h, wherein the coating thickness of the coating slurry is 0.5 mm-1 mm, and the coral aggregate is the phosphoaluminate cement-based chloride ion-curable coral aggregate.
And finally, screening out the grains larger than 19.0mm and smaller than 9.50mm from the coral aggregate prepared by the strengthening method, weighing 3 groups of 3000g of samples of the rest grains for a crushing value test, and finally obtaining the crushing value less than or equal to 18% through test calculation. And the crushing value of the untreated directly selected coral aggregates is less than or equal to 32 percent.
Claims (4)
1. A kind of phosphorus aluminate cement base can solidify the coral aggregate reinforcement slurry of the chloridion, characterized by that, it includes two parts of permeating slurry and coating slurry; the permeable slurry comprises the following components in percentage by mass: 70-85% of phosphoaluminate cement, 1-4% of a permeable crystalline material, 10-25% of a clay mineral admixture, 0.4-2% of a coagulation regulator and 0.6-0.75% of water-cement ratio; the coating slurry comprises the following components in percentage by mass: 70-85% of phosphoaluminate cement, 10-25% of clay mineral admixture, 0.4-2% of coagulation regulator and 0.5-0.6% of water-cement ratio; the clay mineral admixture is at least one of gold tailings and white tungsten tailings.
2. The phosphoaluminate cement-based chloride ion-curable coral aggregate-strengthening slurry as claimed in claim 1, wherein the gold tailings have a specific surface area of > 298m2And/kg, the percent screen residue of the scheelite tailing with 200-mesh sieve is less than 5 percent.
3. The phosphoaluminate cement-based, chloride ion-curable coral aggregate reinforcement slurry of claim 1, wherein the phosphoaluminate cement has a strength grade of not less than 42.5 and a surface area of > 320m2/kg。
4. The phosphoaluminate cement-based chloride ion-curable coral aggregate-strengthening slurry of claim 1, wherein the coral aggregate-strengthening slurry is a coral-shaped material having a coral skeleton and a coral skeleton made of a coral material having a coral skeleton made of a coral skeleton made
The specific using method of the reinforced slurry is as follows:
1) injecting the prepared penetrating slurry into a slurry pool, putting the coral aggregate to be treated into the slurry pool to be soaked for 5min, and then fishing out the coral aggregate from the slurry pool;
2) standing the fished aggregate for 1-2 h, and carrying out the next step after air drying, wherein the thickness of the coating of the permeating slurry is 0.3-0.5 mm;
3) injecting the coating slurry into a spraying mortar machine, putting the coral aggregate obtained by the treatment in the step 2) into a vibrating screen, and spreading to be the thickness of one particle;
4) starting a vibrating screen, starting spraying the coating slurry, and changing the next batch after 1 min; and standing the treated coral aggregate for 30 min-1 h, wherein the coating thickness of the coating slurry is 0.5 mm-1 mm, and the coral aggregate is the phosphoaluminate cement-based chloride ion-curable coral aggregate.
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| CN110272221B (en) * | 2019-05-27 | 2022-05-17 | 深圳大学 | Preparation method of modified coral sand concrete |
| CN110451918B (en) * | 2019-08-28 | 2021-09-14 | 辽宁科大中驰镁建材科技有限公司 | Boric sludge magnesium oxychloride marine ecological fish reef and preparation method thereof |
| CN113780734A (en) * | 2021-08-06 | 2021-12-10 | 中国建筑材料科学研究总院有限公司 | Method for determining using amount of cladding material in coral aggregate modification treatment and modification method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4253375B2 (en) * | 1998-08-20 | 2009-04-08 | 電気化学工業株式会社 | Coated fine aggregate, cement composition, and method for producing cement composition |
| CN105936593A (en) * | 2016-04-28 | 2016-09-14 | 中冶建筑研究总院有限公司 | Seawater coral aggregate concrete |
| CN106630819A (en) * | 2016-11-04 | 2017-05-10 | 中冶建筑研究总院有限公司 | Anti-efflorescence sea water coral aggregate concrete block |
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| CN102757208A (en) * | 2012-07-20 | 2012-10-31 | 济南大学 | Size and method for treating recycled coarse aggregates |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4253375B2 (en) * | 1998-08-20 | 2009-04-08 | 電気化学工業株式会社 | Coated fine aggregate, cement composition, and method for producing cement composition |
| CN105936593A (en) * | 2016-04-28 | 2016-09-14 | 中冶建筑研究总院有限公司 | Seawater coral aggregate concrete |
| CN106630819A (en) * | 2016-11-04 | 2017-05-10 | 中冶建筑研究总院有限公司 | Anti-efflorescence sea water coral aggregate concrete block |
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