CN110981255A - Method for reinforcing porous coral aggregate - Google Patents
Method for reinforcing porous coral aggregate Download PDFInfo
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- CN110981255A CN110981255A CN201911381578.5A CN201911381578A CN110981255A CN 110981255 A CN110981255 A CN 110981255A CN 201911381578 A CN201911381578 A CN 201911381578A CN 110981255 A CN110981255 A CN 110981255A
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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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- 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
- C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B14/02—Granular materials, e.g. microballoons
- C04B14/26—Carbonates
- C04B14/28—Carbonates of calcium
Abstract
The invention discloses a method for reinforcing porous coral aggregates, and belongs to the technical field of application of building materials. Crushing the porous coral aggregate, soaking in the material A as the reinforcing agent, exhausting gas in pores by using ultrasonic oscillation or a vacuum pump, taking out the coral aggregate, drying in an oven, soaking in the material B as the reinforcing agent, taking out, drying, repeating the process for multiple times, mixing the material C as the reinforcing agent with water, and wrapping the coral aggregate to obtain the reinforced coral aggregate. The obtained coral aggregate is low in treatment cost, is non-toxic and harmless, can fill and plug deep long holes and bent holes of the coral aggregate, remarkably reduces water absorption, and increases the workability of coral concrete; the compactness and the strength of the coral aggregate are increased, so that the barrel pressure intensity of the coral aggregate is improved by 80%; the coral aggregate has high anti-splitting performance, acid resistance and high dry-wet cycle resistance.
Description
The technical field is as follows:
the invention relates to the technical field of building material application, in particular to a method for reinforcing porous coral aggregates.
Background art:
the aggregate is an important component of concrete material, for structures on the sea and island buildings, the existing aggregate is mainly continuous graded stone with good grain shape, hard texture and grain diameter of 25mm or less used by common concrete as the aggregate, the common concrete not only has high transportation cost, but also is easy to be limited by conditions of weather and marine environment (such as typhoon) during transportation, so the local material is an effective way for obtaining the aggregate. Coral reef is a calcareous rock mainly composed of coral fragments and marine animal fragments. The calcium content of the coral island is up to 90%, and the coral island or coral reef is largely surrounded by the calcium content of the coral island or coral reef. The bulk density of coral coarse bone is 900kg/m3The apparent density is 1800kg/m3The porosity is as high as 50%, belonging to the category of lightweight aggregate.
Unlike lightweight aggregates, coral aggregates have a surface and internal pore distribution. The coral aggregate has rough and porous surface and great amount of layered structure and cage structure distributed inside, so that it has great specific surface area. Due to the porosity, the cementing material is not easy to fill the inner pores, and the water absorption rate is far higher than that of common concrete and lightweight aggregate concrete aggregate, so that the water requirement and the cement consumption for preparing the coral aggregate concrete are larger, and the defects of poor workability, low strength, poor impermeability and freezing resistance and the like are further shown.
At present, aiming at the problems of porosity, high water absorption rate, low strength and the like of the coral aggregates, the pores are mainly plugged by adopting a cement paste coating surface method and a surface polymer adhesive coating treatment method. The cement paste wrapping method can not be completely immersed in the inner pores of the coral aggregates, and the effect of reducing the water absorption rate is not obvious. The polymer has high adhesiveness, poor fluidity and poor operability, and can reduce the surface roughness of the aggregate and influence the bonding property of the aggregate and cement paste.
The invention content is as follows:
the technical problem is as follows: the invention aims to overcome the defects in the prior art, provides a porous and high-water-absorption coral aggregate reinforcing agent, is used for solving the problems of poor wrapping property, difficulty in immersing into slender pores, poor operability and reduced bonding force with cement slurry of the traditional coral aggregate pore improvement method, improves the performance of coral concrete and enlarges the application range of the coral concrete.
The technical scheme is as follows: the invention relates to a method for reinforcing porous coral aggregates, which comprises the following steps:
a. crushing the porous coral aggregates, screening the crushed porous coral aggregates into coral aggregates with the particle size of 5-20mm, and drying the coral aggregates for 24 hours at the temperature of 105 ℃;
b. immersing the dried coral aggregate in a closed container of a material A of a reinforcing agent for soaking, simultaneously oscillating the coral aggregate by using an ultrasonic oscillator to discharge gas in the coral aggregate, or putting the coral aggregate in the closed container, pumping air in the container to 0.01 standard atmospheric pressure by using a vacuum pump to discharge gas in pores of the coral aggregate, and then immersing the coral aggregate in the material A of the reinforcing agent for soaking in the closed container;
c. taking out the coral aggregates soaked in two different ways of ultrasonic oscillation exhaust or vacuum pump air exhaust, respectively putting the coral aggregates into a drying oven for water glass dehydration treatment, so that water glass solution attached to the coral aggregates is dehydrated to form sodium silicate gel which is attached to pore walls of the porous coral aggregates;
d. soaking the dried coral aggregate in the reinforcing agent B, and after the coral aggregate is soaked in a calcium ion solution, reacting sodium silicate gel with calcium ions as follows:
Na2O·nSiO2+CaCl2→CaSiO3↓+NaCl
Na2O·nSiO2+Ca(OH)2→CaSiO3↓+NaOH
in the formula: na (Na)2O·nSiO2Is water glass with modulus n, CaSiO3Is calcium silicate, Na2O·nSiO2With CaCl2Reaction to produce CaSiO3Precipitating; same Na2O·nSiO2And Ca (OH)2Reaction to produce CaSiO3Precipitate, CaSiO3Is insoluble in water, can block the internal pores of the coral aggregates, has higher strength, canTo increase the strength of the coral aggregate;
soaking the mixture in the reinforcing agent B, taking out and putting the mixture into an oven for drying to ensure that water-insoluble calcium silicate is generated by sodium silicate gel and a calcium ion solution and is precipitated on the pore walls of the coral aggregates to reinforce the pore strength;
e. repeatedly and repeatedly soaking the coral aggregates attached with the calcium silicate in the reinforcing agent A material and the reinforcing agent B material in sequence for many times, and drying for many times to fully fill and plug slender and bent pores in the porous coral aggregates;
f. and e, treating the coral aggregate treated in the step e again by using the slurry of the reinforcing agent C, stirring the mixture in a horizontal stirrer at a low speed for 3 minutes to ensure that the coral aggregate is fully wrapped by the slurry of the reinforcing agent C, filling shallow pores and shallow pits on the surface of the coral aggregate, taking out the coral aggregate, and maintaining the coral aggregate in an environment with the temperature of 60 ℃ and the humidity of more than 95 percent for 3 days to obtain the reinforced coral aggregate.
In the step b, the modulus of the reinforcing agent A material is 2.5-3.5, the Baume degree is 32-48% of sodium water glass, or the Baume degree is 35-50% of potassium water glass.
In the step c, the coral aggregates are soaked in the ultrasonic oscillation exhaust mode for 1.5 to 2.5 hours, and then are put into an oven to be dehydrated by water glass at the temperature of 105 ℃ for 5 to 7 hours; the coral aggregates are soaked in vacuum pump for 8-12 min, and then placed in an oven for water glass dehydration at 80 deg.C for 5-7 hr.
In the step d, the component of the reinforcing agent B material is a saturated calcium chloride solution, a saturated calcium hydroxide solution or a saturated barium chloride solution.
In the step e, the coral aggregates are repeatedly and respectively soaked in the reinforcing agent A material and the reinforcing agent B material for 2 to 4 times in sequence, the soaking time of the reinforcing agent A material is 2.0 to 2.5 hours each time, the soaking time of the reinforcing agent B material is 10 to 12 hours each time, and the drying temperature is 80 ℃.
In the step f, the reinforcing agent C slurry is prepared from reinforcing agent C powder and deionized water, wherein 11.5-18 parts of reinforcing agent C powder by mass is added with 2-3 parts of deionized water and subjected to low-speed wet mixing for 2-3 minutes and high-speed wet mixing for 5-6 minutes.
The reinforcing agent C powder comprises the following components in parts by mass: 4 to 6 portions of P, O, 52, 5R cement, 1.0 to 1.5 portions of 1250-mesh superfine micro-beads, 1.0 to 1.5 portions of 325-mesh granulated blast furnace mineral powder, 0.5 to 1.0 portion of 1250-mesh active metakaolin, 0.5 to 1.0 portion of 325-mesh coral micro-powder, 0.5 to 1.0 portion of nano-silica powder, 4 to 6 portions of 140-mesh 180-mesh quartz sand and 0.01 to 0.02 portion of powder water-reducing dispersion superplasticizer.
Has the advantages that: the water glass solution has good fluidity when the modulus is below 3.5, and can be immersed into the slender pores of the coral aggregates, and the porous coral aggregates are immersed in the water glass solution and vibrate to exhaust along with an ultrasonic oscillator. Taking out the coral aggregates, drying the coral aggregates, dehydrating the water glass solution to form sodium silicate gel, attaching the sodium silicate gel to the pore walls, immersing the sodium silicate gel in the calcium ion solution, reacting the sodium silicate gel with the calcium ions, and generating water-insoluble calcium silicate by the sodium silicate gel and the calcium ion solution to precipitate on the pore walls to fill the pores and provide certain strength. The process is repeated, and the slender and bent pores in the coral aggregates can be filled and blocked. And finally, mixing the slurry of the reinforcing agent C with water to form gelled slurry to treat the coral aggregates and fill shallow pores and pits on the surface. Compared with the prior art, the method has the following advantages:
(1) the coral aggregate has low treatment cost which is far lower than that of a macromolecular adhesive material, and no toxic and harmful components need to be introduced;
(2) the deep long holes and the bent holes of the coral aggregates can be filled and plugged, the water absorption rate is obviously reduced, and the workability of the coral concrete is improved;
(3) the compactness and the strength of the coral aggregate are increased, so that the barrel pressure intensity of the coral aggregate is improved by 80%;
(4) the anti-splitting performance of the coral aggregate is improved;
(5) the pumping performance, freezing resistance, permeability resistance, carbonization resistance and ion invasion resistance of the coral concrete are improved;
(6) the acid resistance and the dry-wet cycle resistance of the coral aggregate are improved.
The specific implementation mode is as follows:
the invention relates to a method for reinforcing porous coral aggregates, which comprises the following steps:
a. crushing the porous coral aggregates, screening the crushed porous coral aggregates into coral aggregates with the particle size of 5-20mm, and drying the coral aggregates for 24 hours at the temperature of 105 ℃;
b. immersing the dried coral aggregate in a closed container of a material A of a reinforcing agent for soaking, simultaneously oscillating the coral aggregate by using an ultrasonic oscillator to discharge gas in the coral aggregate, or putting the coral aggregate in the closed container, pumping air in the container to 0.01 standard atmospheric pressure by using a vacuum pump to discharge gas in pores of the coral aggregate, and then immersing the coral aggregate in the material A of the reinforcing agent for soaking in the closed container; the modulus of the reinforcing agent A material is 2.5-3.5, the baume degree is 32-48% of sodium water glass, or the baume degree is 35-50% of potassium water glass.
c. Taking out the coral aggregates soaked in two different modes of ultrasonic oscillation exhaust and vacuum pump air exhaust, respectively putting the coral aggregates into a drying oven for water glass dehydration treatment, so that water glass solution attached to the coral aggregates is dehydrated to form sodium silicate gel which is attached to pore walls of the porous coral aggregates; the time for soaking the coral aggregates by using the ultrasonic oscillation exhaust mode is 1.5 to 2.5 hours, and the coral aggregates are put into an oven for water glass dehydration treatment at the temperature of 105 ℃ for 5 to 7 hours; the coral aggregates are soaked in vacuum pump for 8-12 min, and then placed in an oven for water glass dehydration at 80 deg.C for 5-7 hr.
d. Soaking the dried coral aggregate in the reinforcing agent B, and after the coral aggregate is soaked in a calcium ion solution, reacting sodium silicate gel with calcium ions as follows:
Na2O·nSiO2+CaCl2→CaSiO3↓+NaCl
Na2O·nSiO2+Ca(OH)2→CaSiO3↓+NaOH
in the formula: na (Na)2O·nSiO2Is water glass with modulus n, CaSiO3Is calcium silicate, Na2O·nSiO2With CaCl2Reaction to produce CaSiO3Precipitating; same Na2O·nSiO2And Ca (OH)2Reaction to produce CaSiO3Precipitate, CaSiO3The coral skeleton is insoluble in water, can plug the internal pores of the coral skeleton, has higher strength and can increase the strength of the coral skeleton;
soaking the mixture in the reinforcing agent B, taking out and putting the mixture into an oven for drying to ensure that water-insoluble calcium silicate is generated by sodium silicate gel and a calcium ion solution and is precipitated on the pore walls of the coral aggregates to reinforce the pore strength; the component of the reinforcing agent B material is a saturated calcium chloride solution, a saturated calcium hydroxide solution or a saturated barium chloride solution, and the soaking time is 10-12 hours;
e. repeatedly and repeatedly soaking the coral aggregates attached with the calcium silicate in the reinforcing agent A material and the reinforcing agent B material in sequence for many times, and drying for many times to fully fill and plug slender and bent pores in the porous coral aggregates; the coral aggregates are repeatedly soaked in the reinforcing agent B for 2 to 4 times, the soaking time of the reinforcing agent A for each time is 2.0 to 2.5 hours, the soaking time of the reinforcing agent B for each time is 10 to 12 hours, and the drying temperature is 80 ℃.
f. And e, treating the coral aggregate treated in the step e again by using the slurry of the reinforcing agent C, stirring the mixture in a horizontal stirrer at a low speed for 3 minutes to ensure that the coral aggregate is fully wrapped by the slurry of the reinforcing agent C, filling shallow pores and shallow pits on the surface of the coral aggregate, taking out the coral aggregate, and maintaining the coral aggregate in an environment with the temperature of 60 ℃ and the humidity of more than 95 percent for 3 days to obtain the reinforced coral aggregate.
The reinforcing agent C slurry is prepared from reinforcing agent C powder and deionized water, wherein 11.5-18 parts by mass of the reinforcing agent C powder is added with 2-3 parts by mass of deionized water and subjected to low-speed wet mixing for 2-3 minutes and high-speed wet mixing for 5-6 minutes.
The reinforcing agent C powder comprises the following components in parts by mass: 4 to 6 portions of P, O, 52, 5R cement, 1.0 to 1.5 portions of 1250-mesh superfine micro-beads, 1.0 to 1.5 portions of 325-mesh granulated blast furnace mineral powder, 0.5 to 1.0 portion of 1250-mesh active metakaolin, 0.5 to 1.0 portion of 325-mesh coral micro-powder, 0.5 to 1.0 portion of nano-silica powder, 4 to 6 portions of 140-mesh 180-mesh quartz sand and 0.01 to 0.02 portion of powder water-reducing dispersion superplasticizer.
Example 1
The method comprises the following steps: crushing the coral aggregates by using a jaw crusher, screening the coral aggregates with the particle size of 10mm, and drying the coral aggregates for 24 hours at the temperature of 105 ℃; after drying, immersing the coral aggregates in a closed container containing sodium silicate with the water glass modulus of 3.5 and the Baume degree of 40% for soaking, and simultaneously oscillating the coral aggregates by using an ultrasonic oscillator to discharge gas in the coral aggregates; after soaking for 2 hours, taking out the coral aggregates in a closed container, wiping the surfaces clean, and putting the coral aggregates in a 105 ℃ oven for water glass dehydration. And taking out the dehydrated coral aggregate after 6 hours, soaking the coral aggregate in a saturated calcium chloride solution for 12 hours, taking out the coral aggregate, and drying the coral aggregate in an oven at the temperature of 80 ℃ for 6 hours. Soaking the coral aggregate in the sodium water glass solution for 2 hours again, taking out and drying the coral aggregate, soaking the coral aggregate in the saturated calcium chloride solution for 2 hours, taking out and drying the coral aggregate, and repeating the process for three times to obtain the treated low-porosity coral aggregate;
step two: preparing reinforcing agent C powder by using 5.5 parts of P.O.52.5R cement, 1.5 parts of 1250-mesh ultrafine microspheres, 1.5 parts of 325-mesh granulated blast furnace mineral powder, 0.5 part of 1250-mesh active metakaolin, 0.5 part of 325-mesh coral micro powder, 0.5 part of nano silicon dioxide powder, 5.5 parts of 140-mesh 180-mesh quartz sand and 0.015 part of powder water-reducing dispersion superplasticizer, putting 12 parts of reinforcing agent powder into a horizontal mixer for low-speed dry stirring for 2 minutes, adding 2.5 parts of deionized water for low-speed wet stirring for 2 minutes and high-speed wet stirring for 5 minutes to prepare reinforcing agent C slurry;
step three: and (3) mixing 1 part of coral aggregate treated in the first step with 1 part of the reinforcing agent C slurry prepared in the second step, stirring at a low speed for 3 minutes in a horizontal stirrer to ensure that the coral aggregate is fully wrapped by the reinforcing agent C slurry, taking out the coral aggregate, and maintaining for 3 days in an environment with the temperature of 60 ℃ and the humidity of more than 95%.
Example 2
The method comprises the following steps: a method for enhancing porous coral aggregate comprises crushing coral aggregate with a jaw crusher, sieving coral aggregate with particle size of 10mm, and oven drying at 105 deg.C for 24 hr; after drying, placing the coral aggregate into a closed container, pumping air in the container to 0.01 standard atmospheric pressure by using a vacuum pump, and then immersing the coral aggregate into the reinforcing agent A in the closed container, namely, sodium silicate with the modulus of 2.5 and the baume degree of 35 percent is contained in the sodium silicate; after soaking for 8-12 minutes, taking out the coral aggregates in a closed container, wiping the surfaces clean, and putting the coral aggregates in an oven at 80 ℃ for water glass dehydration. And taking out the dehydrated coral aggregate after 6 hours, putting the coral aggregate into an enhancer B, namely a saturated calcium chloride solution, soaking for 12 hours, taking out the coral aggregate, and putting the coral aggregate into an oven at 80 ℃ for drying. And soaking the coral aggregates in the sodium water glass solution for 2 hours again, taking out the coral aggregates, drying the coral aggregates, and soaking the coral aggregates in the saturated calcium chloride solution for 2 hours. Soaking the coral aggregate in the sodium water glass solution for 2 hours again, taking out and drying, soaking in the saturated calcium chloride solution for 2 hours, taking out and drying, and repeating the process for 2 times to obtain the treated low-porosity coral aggregate;
step two: 5.5 parts of P.O.52.5R cement, 1.5 parts of 1250-mesh ultrafine micro-beads, 1.5 parts of 325-mesh granulated blast furnace mineral powder, 0.5 part of 1250-mesh active metakaolin, 0.5 part of 325-mesh coral micro-powder, 0.5 part of nano silicon dioxide powder, 5.5 parts of 140-mesh 180-mesh quartz sand and 0.015 part of powder water-reducing dispersion superplasticizer are used for preparing the reinforcing agent C powder, 15 parts of the reinforcing agent C powder are put into a horizontal mixer to be dried at a low speed for 2 minutes, 2.5 parts of deionized water is added to be wet-stirred at a low speed for 2 minutes and 6 minutes at a high speed, and reinforcing agent C slurry is prepared.
Step three: and (3) mixing 1 part of coral aggregate treated in the first step with 1.5 parts of the reinforcing agent C slurry prepared in the second step, stirring at a low speed for 3 minutes in a horizontal stirrer to fully wrap the coral aggregate with the reinforcing agent C slurry, taking out the coral aggregate, and maintaining for 3 days in an environment with the temperature of 60 ℃ and the humidity of more than 95%.
Example 3
The method comprises the following steps: crushing the coral aggregates by using a jaw crusher, screening the coral aggregates with the particle size of 10mm, and drying the coral aggregates for 24 hours at the temperature of 105 ℃; after drying, immersing the coral aggregate in potassium-containing water glass with the modulus of water glass of 3 and the baume degree of 45%, and simultaneously oscillating the coral aggregate by using an ultrasonic oscillator to discharge gas in the coral aggregate; after soaking for 1.5 hours, taking out the coral aggregates in a closed container, wiping the surfaces of the coral aggregates clean, and putting the coral aggregates in a 105 ℃ oven for water glass dehydration; and taking out the dehydrated coral aggregate after 7 hours, putting the coral aggregate into an enhancer B, namely a saturated calcium chloride solution, soaking for 10 hours, taking out the coral aggregate, and putting the coral aggregate into an oven at 80 ℃ for drying for 5 hours. And (3) soaking the coral aggregate in the potassium-water glass solution for 2.5 hours again, taking out and drying the coral aggregate, soaking the coral aggregate in the saturated calcium chloride solution for 2 hours, taking out and drying the coral aggregate, and repeating the process for three times to obtain the treated low-porosity coral aggregate.
Step two: preparing reinforcing agent C powder by using 5 parts of P.O.52.5R cement, 1 part of 1250-mesh ultrafine micro-beads, 1 part of 325-mesh granulated blast furnace mineral powder, 0.6 part of 1250-mesh active metakaolin, 0.5 part of 325-mesh coral micro-powder, 0.8 part of nano silicon dioxide powder, 5 parts of 140-mesh quartz sand and 0.015 powder water-reducing dispersion superplasticizer, putting 18 parts of reinforcing agent C powder into a horizontal mixer, performing low-speed dry mixing for 2 minutes, adding 2.5 parts of deionized water, performing low-speed wet mixing for 2 minutes, and performing high-speed wet mixing for 5 minutes to prepare reinforcing agent C slurry;
step three: and (3) mixing 1 part of coral aggregate treated in the first step with 2 parts of the reinforcing agent C slurry prepared in the second step, stirring at a low speed for 3 minutes in a horizontal stirrer to ensure that the coral aggregate is fully wrapped by the reinforcing agent C slurry, taking out the coral aggregate, and maintaining for 3 days in an environment with the temperature of 60 ℃ and the humidity of more than 95%.
Example 4
The method comprises the following steps: a method for enhancing porous coral aggregate comprises crushing coral aggregate with a jaw crusher, sieving coral aggregate with particle size of 15mm, and oven drying at 105 deg.C for 24 hr; after drying, immersing the coral aggregate in an intensifier A, namely a closed container containing potassium water glass with the modulus of water glass of 2.5 and the baume degree of 35%, and simultaneously oscillating the coral aggregate by using an ultrasonic oscillator to discharge gas in the coral aggregate; after soaking for 2 hours, taking out the coral aggregates in a closed container, wiping the surfaces of the coral aggregates clean, and putting the coral aggregates in a 105 ℃ oven for water glass dehydration; and taking out the dehydrated coral aggregate after 6 hours, putting the coral aggregate into an enhancer B, namely a saturated calcium chloride solution, soaking for 11 hours at the temperature of 80 ℃, taking out the coral aggregate and putting the coral aggregate into an oven at the temperature of 80 ℃ for drying for 5 hours. And soaking the coral aggregate in the sodium water glass solution for 2 hours again, taking out and drying the coral aggregate, soaking the coral aggregate in the saturated calcium chloride solution for 2 hours, taking out and drying the coral aggregate, and repeating the process for three times to obtain the treated low-porosity coral aggregate.
Step two: preparing reinforcing agent C powder by using 6 parts of P.O.52.5R cement, 1 part of 1250-mesh ultrafine micro-beads, 1 part of 325-mesh granulated blast furnace mineral powder, 0.8 part of 1250-mesh active metakaolin, 0.8 part of 325-mesh coral micro-powder, 0.8 part of nano silicon dioxide powder, 6 parts of 140-mesh and 180-mesh quartz sand and 0.02 part of powder water-reducing dispersion superplasticizer, putting 15 parts of reinforcing agent C powder into a horizontal mixer, performing low-speed dry mixing for 2 minutes, adding 3 parts of deionized water, performing low-speed wet mixing for 2 minutes, and performing high-speed wet mixing for 5 minutes to obtain reinforcing agent C slurry.
Step three: and (3) mixing 2 parts of coral aggregate treated in the first step with 1.5 parts of the reinforcing agent C slurry prepared in the second step, stirring at a low speed for 3 minutes in a horizontal stirrer to ensure that the coral aggregate is fully wrapped by the surface wrapping liquid, taking out, and curing for 3 days in an environment with the temperature of 60 ℃ and the humidity of more than 95 percent.
Example 5
The method comprises the following steps: a method for reinforcing porous coral aggregate comprises crushing coral aggregate with a jaw crusher, sieving coral aggregate with particle size of 5mm, and oven drying at 105 deg.C for 24 hr. After drying, the coral aggregates are immersed in the reinforcing agent A, namely a closed container containing potassium water glass with the modulus of water glass of 3 and the Baume degree of 40%, and the coral aggregates are oscillated by an ultrasonic oscillator to discharge gas in the coral aggregates. After soaking for 2 hours, taking out the coral aggregates in a closed container, wiping the surfaces clean, and putting the coral aggregates in a 105 ℃ oven for water glass dehydration. And taking out the dehydrated coral aggregate after 6 hours, putting the coral aggregate into an enhancer B, namely a saturated calcium hydroxide solution, soaking for 12 hours, taking out the coral aggregate, and putting the coral aggregate into an oven at 80 ℃ for drying for 6 hours. And soaking the coral aggregate in the sodium water glass solution for 2 hours again, taking out and drying the coral aggregate, soaking the coral aggregate in the saturated calcium hydroxide solution for 2 hours, taking out and drying the coral aggregate, and repeating the process for three times to obtain the treated low-porosity coral aggregate.
Step two: 5.5 parts of P.O.52.5R cement, 1.5 parts of 1250-mesh ultrafine micro-beads, 1.5 parts of 325-mesh granulated blast furnace mineral powder, 0.5 part of 1250-mesh active metakaolin, 0.5 part of 325-mesh coral micro-powder, 0.5 part of nano silicon dioxide powder, 5.5 parts of 140-mesh 180-mesh quartz sand and 0.015 part of powder water-reducing dispersion superplasticizer are used for preparing reinforcing agent C powder, 15 parts of reinforcing agent C powder are put into a horizontal mixer to be dried at a low speed for 2 minutes, 2 parts of deionized water is added to be wet-stirred at a low speed for 2 minutes and the high speed is wet-stirred for 5 minutes, thus preparing reinforcing agent C slurry.
Step three: mixing 2.5 parts of coral aggregate treated in the first step with 1.5 parts of the reinforcing agent C slurry prepared in the second step, stirring at a low speed for 3 minutes in a horizontal stirrer to ensure that the coral aggregate is fully wrapped by the surface wrapping liquid, taking out, and curing for 3 days in an environment with the temperature of 60 ℃ and the humidity of more than 95 percent.
Example 6
The method comprises the following steps: a method for reinforcing porous coral aggregate comprises crushing coral aggregate with a jaw crusher, sieving coral aggregate with a particle size of 20mm, and oven drying at 105 deg.C for 24 hr. After drying, the coral aggregates are immersed in the reinforcing agent A, namely a closed container containing potassium water glass with the modulus of water glass of 3.5 and the Baume degree of 48 percent, and the coral aggregates are oscillated by an ultrasonic oscillator to discharge gas in the coral aggregates. After soaking for 2 hours, taking out the coral aggregates in a closed container, wiping the surfaces clean, and putting the coral aggregates in a 105 ℃ oven for water glass dehydration. And taking out the dehydrated coral aggregate after 6 hours, putting the coral aggregate into a reinforcing agent B, namely a saturated barium chloride solution, soaking for 12 hours, taking out the coral aggregate, and putting the coral aggregate into an oven at 80 ℃ for drying for 7 hours. And soaking the coral aggregate in the sodium water glass solution for 2 hours again, taking out and drying the coral aggregate, soaking the coral aggregate in the saturated barium chloride solution for 2 hours, taking out and drying the coral aggregate, and repeating the process for three times to obtain the treated low-porosity coral aggregate.
Step two: 5.5 parts of P.O.52.5R cement, 1.5 parts of 1250-mesh ultrafine micro-beads, 1.5 parts of 325-mesh granulated blast furnace mineral powder, 0.5 part of 1250-mesh active metakaolin, 0.5 part of 325-mesh coral micro-powder, 0.5 part of nano silicon dioxide powder, 5.5 parts of 140-mesh 180-mesh quartz sand and 0.015 part of powder water-reducing dispersion superplasticizer are used for preparing the reinforcing agent C powder, 15 parts of the reinforcing agent C powder are put into a horizontal mixer to be dried at a low speed for 2 minutes, 2.5 parts of deionized water is added to be wet-stirred at a low speed for 2 minutes and 5 minutes at a high speed, and reinforcing agent C slurry is prepared.
Step three: and (3) mixing 2 parts of coral aggregate treated in the first step with 1 part of the reinforcing agent C slurry prepared in the second step, stirring at a low speed for 3 minutes in a horizontal stirrer to ensure that the coral aggregate is fully wrapped by the surface wrapping liquid, taking out, and curing for 3 days in an environment with the temperature of 60 ℃ and the humidity of more than 95 percent.
The barrel pressure strength and water absorption before and after treatment of the coral aggregates were measured according to the test methods in GBT 17431.2-2010 test methods for lightweight aggregates and test methods thereof, part 2: lightweight aggregate test methods, as shown in Table 1:
TABLE 1 barrel compressive Strength and one-hour Water absorption of coral aggregates before and after treatment
As can be seen from Table 1, the vacuum treatment has better exhausting effect than ultrasonic treatment, the barrel pressure is greatly increased, and the water absorption is remarkably reduced. The calcium ion solution has the effects of a barium chloride solution, a calcium chloride solution and a calcium hydroxide solution from high to low in sequence. The heated calcium ion solution can shorten the soaking time.
Claims (7)
1. A method for reinforcing porous coral aggregates is characterized by comprising the following steps:
a. crushing the porous coral aggregates, screening the crushed porous coral aggregates into coral aggregates with the particle size of 5-20mm, and drying the coral aggregates for 24 hours at the temperature of 105 ℃;
b. immersing the dried coral aggregate in a closed container of a material A of a reinforcing agent for soaking, simultaneously oscillating the coral aggregate by using an ultrasonic oscillator to discharge gas in the coral aggregate, or putting the coral aggregate in the closed container, pumping air in the container to 0.01 standard atmospheric pressure by using a vacuum pump to discharge gas in pores of the coral aggregate, and then immersing the coral aggregate in the material A of the reinforcing agent for soaking in the closed container;
c. taking out the coral aggregates soaked in two different ways of ultrasonic oscillation exhaust or vacuum pump air exhaust, respectively putting the coral aggregates into a drying oven for water glass dehydration treatment, so that water glass solution attached to the coral aggregates is dehydrated to form sodium silicate gel which is attached to pore walls of the porous coral aggregates;
d. soaking the dried coral aggregate in the reinforcing agent B, and after the coral aggregate is soaked in a calcium ion solution, reacting sodium silicate gel with calcium ions as follows:
Na2O·nSiO2+CaCl2→CaSiO3↓+NaCl
Na2O·nSiO2+Ca(OH)2→CaSiO3↓+NaOH
in the formula: na (Na)2O·nSiO2Is water glass with modulus n, CaSiO3Is calcium silicate, Na2O·nSiO2With CaCl2Reaction to produce CaSiO3Precipitating; same Na2O·nSiO2And Ca (OH)2Reaction to produce CaSiO3Precipitate, CaSiO3The coral skeleton is insoluble in water, and can plug the internal pores of the coral skeleton and increase the strength of the coral skeleton;
after soaking in the reinforcing agent B material, taking out and putting into an oven for drying, and precipitating water-insoluble calcium silicate generated by sodium silicate gel and calcium ion solution on the pore walls of the coral aggregates so as to reinforce the pore strength;
e. repeatedly and repeatedly soaking the coral aggregates attached with the calcium silicate in the reinforcing agent A material and the reinforcing agent B material in sequence for many times, and drying for many times to fully fill and plug slender and bent pores in the porous coral aggregates;
f. and e, treating the coral aggregate treated in the step e again by using the slurry of the reinforcing agent C, stirring the mixture in a horizontal stirrer at a low speed for 3 minutes to ensure that the coral aggregate is fully wrapped by the slurry of the reinforcing agent C, filling shallow pores and shallow pits on the surface of the coral aggregate, taking out the coral aggregate, and maintaining the coral aggregate in an environment with the temperature of 60 ℃ and the humidity of more than 95 percent for 3 days to obtain the reinforced coral aggregate.
2. The method for reinforcing a porous coral aggregate according to claim 1, wherein: in the step b, the modulus of the reinforcing agent A material is 2.5-3.5, the Baume degree is 32-48% of sodium water glass, or the Baume degree is 35-50% of potassium water glass.
3. The method for reinforcing a porous coral aggregate according to claim 1, wherein: in the step c, the coral aggregates are soaked in the ultrasonic oscillation exhaust mode for 1.5 to 2.5 hours, and then are put into an oven to be dehydrated by water glass at the temperature of 105 ℃ for 5 to 7 hours; the coral aggregates are soaked in vacuum pump for 8-12 min, and then placed in an oven for water glass dehydration at 80 deg.C for 5-7 hr.
4. The method for reinforcing a porous coral aggregate according to claim 1, wherein: in the step d, the component of the reinforcing agent B material is a saturated calcium chloride solution, a saturated calcium hydroxide solution or a saturated barium chloride solution.
5. The method for reinforcing a porous coral aggregate according to claim 1, wherein: in the step e, the coral aggregates are repeatedly and respectively soaked in the reinforcing agent A material and the reinforcing agent B material for 2 to 4 times in sequence, the soaking time of the reinforcing agent A material is 2.0 to 2.5 hours each time, the soaking time of the reinforcing agent B material is 10 to 12 hours each time, and the drying temperature is 80 ℃.
6. The method for reinforcing a porous coral aggregate according to claim 1, wherein: in the step f, the reinforcing agent C slurry is prepared from reinforcing agent C powder and deionized water, wherein 11.5-18 parts of reinforcing agent C powder by mass is added with 2-3 parts of deionized water and subjected to low-speed wet mixing for 2-3 minutes and high-speed wet mixing for 5-6 minutes.
7. The method for reinforcing a porous coral aggregate according to claim 6, wherein: the reinforcing agent C powder comprises the following components in parts by mass: 4 to 6 portions of P, O, 52, 5R cement, 1.0 to 1.5 portions of 1250-mesh superfine micro-beads, 1.0 to 1.5 portions of 325-mesh granulated blast furnace mineral powder, 0.5 to 1.0 portion of 1250-mesh active metakaolin, 0.5 to 1.0 portion of 325-mesh coral micro-powder, 0.5 to 1.0 portion of nano-silica powder, 4 to 6 portions of 140-mesh 180-mesh quartz sand and 0.01 to 0.02 portion of powder water-reducing dispersion superplasticizer.
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