CN110981250A - Early strength type functional admixture and preparation method and use method thereof - Google Patents

Early strength type functional admixture and preparation method and use method thereof Download PDF

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Publication number
CN110981250A
CN110981250A CN201911422517.9A CN201911422517A CN110981250A CN 110981250 A CN110981250 A CN 110981250A CN 201911422517 A CN201911422517 A CN 201911422517A CN 110981250 A CN110981250 A CN 110981250A
Authority
CN
China
Prior art keywords
admixture
early strength
seconds
fly ash
diethylamine
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201911422517.9A
Other languages
Chinese (zh)
Inventor
王发洲
张平
杨锐礼
刘鹏
杨露
赵都
胡传林
胡曙光
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shanxi Kaidi Building Material Co ltd
Wuhan University of Technology WUT
Original Assignee
Shanxi Kaidi Building Material Co ltd
Wuhan University of Technology WUT
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Shanxi Kaidi Building Material Co ltd, Wuhan University of Technology WUT filed Critical Shanxi Kaidi Building Material Co ltd
Priority to CN201911422517.9A priority Critical patent/CN110981250A/en
Publication of CN110981250A publication Critical patent/CN110981250A/en
Pending legal-status Critical Current

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Classifications

    • 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
    • C04B20/02—Treatment
    • C04B20/023—Chemical treatment
    • 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
    • C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
    • C04B18/04—Waste materials; Refuse
    • C04B18/06—Combustion residues, e.g. purification products of smoke, fumes or exhaust gases
    • C04B18/08—Flue dust, i.e. fly ash
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/91—Use of waste materials as fillers for mortars or concrete

Abstract

The invention discloses an early strength type functional admixture, a preparation method and a use method thereof, wherein the preparation method comprises the following steps: mixing fly ash and diethylamine according to the mass ratio of 6-9: 1, weighing, putting the raw material sample into a ball milling tank, and adding a grinding medium; the fly ash and diethylamine are reacted by ball milling with a dry milling method, and the early strength functional admixture is prepared after ball milling reaction for 6 to 10 hours. The early strength type functional admixture prepared by the method can greatly improve the early strength of the prepared cement-based material, and has short preparation period and good repeatability.

Description

Early strength type functional admixture and preparation method and use method thereof
Technical Field
The invention relates to an early strength functional admixture, a preparation method and a use method thereof, belonging to the technical field of early strength functional admixtures.
Background
The cement-based materials are the most widely applied building materials, many cement-based material building structures are damaged in different degrees and need to be repaired, the repair processes of expressways, tunnels, bridges and the like require rapid rush repair and opening, and the conventional cement-based materials are often difficult to achieve enough strength in a short time. Therefore, higher demands are made on the early properties of cement-based repair materials.
Disclosure of Invention
In order to solve the defects in the prior art, the invention discloses an early strength type functional admixture, a preparation method and a use method thereof.
The invention is realized by the following technical scheme:
a preparation method of an early strength type functional admixture comprises the following steps:
firstly, mixing fly ash and diethylamine according to the mass ratio of 6-18: 1, weighing, putting the raw material sample into a ball milling tank, and adding a grinding medium;
and secondly, performing ball milling by a dry milling method to enable the fly ash and diethylamine to react, and performing ball milling reaction for 6-10 hours to prepare the early strength type functional admixture.
The volume ratio of the grinding medium to the raw material sample is 3-7: 1.
the rotation speed of the ball mill in the ball milling reaction is 200-300 revolutions per minute.
The early strength functional admixture prepared by the method.
The use method of the early strength functional admixture comprises the following steps:
1) weighing the early strength type functional admixture and the cement according to the proportion of 1-2:10, and stirring until the admixture and the cement are fully mixed to obtain a mixed sample;
2) adding 20-35% by mass of water into the mixed sample, slowly stirring for 20-50 seconds, quickly stirring for 20-50 seconds, standing for 50-100 seconds, and then quickly stirring for 20-50 seconds to obtain a product slurry;
3) pouring the product slurry into a mold, curing at 20 +/-2 ℃ and 95 +/-5% relative humidity, and demolding to obtain the final product.
Compared with the prior art, the invention has the following beneficial effects:
the fly ash used in the present invention can create a cementitious system and significantly improve the workability of concrete, so that the fly ash can replace part of the cement. The surface of the fly ash is alkaline, and a certain amount of silicon hydroxyl exists, so that the fly ash can react with diethylamine molecules, and covalent bond linkage of the fly ash and the diethylamine molecules can be generated. According to the invention, the reaction of diethylamine and fly ash occurs in the ball milling process, diethylamine molecules are linked with hydroxyl on the surface of fly ash in the process to prepare the admixture with the early strength function, and the early strength of the cement-based material prepared after the admixture is added into cement can be greatly improved.
Detailed Description
The present invention will be described in further detail with reference to specific examples, but the scope of the present invention is not limited to these examples, and all changes or equivalent substitutions that do not depart from the spirit of the present invention are intended to be included within the scope of the present invention.
Example 1:
in the first step, 900 grams of fly ash and 100 grams of diethylamine are charged to a ball mill pot and grinding media is charged. The volume ratio of grinding media to sample was 5: 1.
And secondly, placing the nodular graphite pipe on a ball mill, and reacting the fly ash and diethylamine by a dry grinding method. The ball mill was rotated at 280 rpm for 9 hours.
And thirdly, collecting an early strength admixture sample, taking 70 g of the admixture sample and 700 g of Portland cement, and stirring to fully mix the admixture sample and the Portland cement. To the above mixture was added 250 g of water, slowly stirred for 30 seconds, rapidly stirred for 30 seconds, left to stand for 60 seconds, and then rapidly stirred for 30 seconds.
And fourthly, pouring the slurry into a mold, curing for 1 day at 20 +/-2 ℃ and 95 +/-5% relative humidity, and then demolding.
And fifthly, measuring the 1 d compressive strength of the product, wherein the 1 d compressive strength of the product can reach 16.8 MPa through tests.
Example 2:
in the first step, 900 grams of fly ash and 50 grams of diethylamine are charged into a ball mill pot and charged with grinding media. The volume ratio of grinding media to sample was 5: 1.
And secondly, placing the nodular graphite pipe on a ball mill, and reacting the fly ash and diethylamine by a dry grinding method. The ball mill was rotated at 280 rpm for 9 hours.
And thirdly, collecting an early strength admixture sample, taking 70 g of the admixture sample and 700 g of Portland cement, and stirring to fully mix the admixture sample and the Portland cement. To the above mixture was added 250 g of water, slowly stirred for 30 seconds, rapidly stirred for 30 seconds, left to stand for 60 seconds, and then rapidly stirred for 30 seconds.
And fourthly, pouring the slurry into a mold, curing for 1 day at 20 +/-2 ℃ and 95 +/-5% relative humidity, and then demolding.
And step five, measuring the 1 d compressive strength of the product, wherein the 1 d compressive strength of the product can reach 11.9 MPa through tests.
Example 3:
in the first step, 900 grams of fly ash and 75 grams of diethylamine are charged to a ball mill pot and charged with grinding media. The volume ratio of grinding media to sample was 5: 1.
And secondly, placing the nodular graphite pipe on a ball mill, and reacting the fly ash and diethylamine by a dry grinding method. The ball mill was rotated at 280 rpm for 9 hours.
And thirdly, collecting an early strength admixture sample, taking 70 g of the admixture sample and 700 g of Portland cement, and stirring to fully mix the admixture sample and the Portland cement. To the above mixture was added 250 g of water, slowly stirred for 30 seconds, rapidly stirred for 30 seconds, left to stand for 60 seconds, and then rapidly stirred for 30 seconds.
And fourthly, pouring the slurry into a mold, curing for 1 day at 20 +/-2 ℃ and 95 +/-5% relative humidity, and then demolding.
And step five, measuring the 1 d compressive strength of the product, wherein the 1 d compressive strength of the product can reach 13.1 MPa through tests.
Example 4:
in the first step, 900 grams of fly ash and 125 grams of diethylamine are charged to a ball mill pot and charged with grinding media. The volume ratio of grinding media to sample was 5: 1.
And secondly, placing the nodular graphite pipe on a ball mill, and reacting the fly ash and diethylamine by a dry grinding method. The ball mill was rotated at 280 rpm for 9 hours.
And thirdly, collecting an early strength admixture sample, taking 70 g of the admixture sample and 700 g of Portland cement, and stirring to fully mix the admixture sample and the Portland cement. To the above mixture was added 250 g of water, slowly stirred for 30 seconds, rapidly stirred for 30 seconds, left to stand for 60 seconds, and then rapidly stirred for 30 seconds.
And fourthly, pouring the slurry into a mold, curing for 1 day at 20 +/-2 ℃ and 95 +/-5% relative humidity, and then demolding.
And step five, measuring the 1 d compressive strength of the product, wherein the 1 d compressive strength of the product can reach 15.1 MPa through tests.
Example 5:
in the first step, 900 grams of fly ash and 150 grams of diethylamine are charged into a ball mill pot and charged with grinding media. The volume ratio of grinding media to sample was 5: 1.
And secondly, placing the nodular graphite pipe on a ball mill, and reacting the fly ash and diethylamine by a dry grinding method. The ball mill was rotated at 280 rpm for 9 hours.
And thirdly, collecting an early strength admixture sample, taking 70 g of the admixture sample and 700 g of Portland cement, and stirring to fully mix the admixture sample and the Portland cement. To the above mixture was added 250 g of water, slowly stirred for 30 seconds, rapidly stirred for 30 seconds, left to stand for 60 seconds, and then rapidly stirred for 30 seconds.
And fourthly, pouring the slurry into a mold, curing for 1 day at 20 +/-2 ℃ and 95 +/-5% relative humidity, and then demolding.
And step five, measuring the 1 d compressive strength of the product, wherein the 1 d compressive strength of the product can reach 14.7 MPa through tests.
Example 6
In the first step, 900 grams of fly ash and 100 grams of diethylamine are charged to a ball mill pot and grinding media is charged. The volume ratio of grinding media to sample was 3: 1.
And secondly, placing the nodular graphite pipe on a ball mill, and reacting the fly ash and diethylamine by a dry grinding method. The ball mill rotates at 200 rpm for 10 hours.
And thirdly, collecting an early strength admixture sample, and taking 200 g of the admixture sample and 800 g of Portland cement, and stirring to fully mix the admixture sample and the 800 g of Portland cement. To the above mixed sample was added 200 g of water, and the mixture was stirred slowly for 20 seconds, quickly stirred for 20 seconds, left to stand for 70 seconds, and then quickly stirred for 50 seconds.
And fourthly, pouring the slurry into a mold, curing for 1 day at 20 +/-2 ℃ and 95 +/-5% relative humidity, and then demolding.
Example 7
In the first step, 900 grams of fly ash and 100 grams of diethylamine are charged to a ball mill pot and grinding media is charged. The volume ratio of grinding media to sample was 7: 1.
And secondly, placing the nodular graphite pipe on a ball mill, and reacting the fly ash and diethylamine by a dry grinding method. The ball mill rotates at 300 rpm for 6 hours.
And thirdly, collecting an early strength admixture sample, taking 120 g of the admixture sample and 800 g of Portland cement, and stirring to fully mix the admixture sample and the 800 g of Portland cement. To the above mixture was added 230 g of water, slowly stirred for 50 seconds, rapidly stirred for 20 seconds, left to stand for 50 seconds, and then rapidly stirred for 20 seconds.
And fourthly, pouring the slurry into a mold, curing for 1 day at 20 +/-2 ℃ and 95 +/-5% relative humidity, and then demolding.
Example 8
In the first step, 900 grams of fly ash and 150 grams of diethylamine are charged into a ball mill pot and charged with grinding media. The volume ratio of grinding media to sample was 6: 1.
And secondly, placing the nodular graphite pipe on a ball mill, and reacting the fly ash and diethylamine by a dry grinding method. The ball mill rotates at 300 rpm for 8 hours.
And thirdly, collecting an early strength admixture sample, taking 160 g of the admixture sample and 800 g of Portland cement, and stirring to fully mix the admixture sample and the Portland cement. To the above mixture was added 250 g of water, slowly stirred for 40 seconds, rapidly stirred for 40 seconds, left to stand for 100 seconds, and then rapidly stirred for 40 seconds.
And fourthly, pouring the slurry into a mold, curing for 1 day at 20 +/-2 ℃ and 95 +/-5% relative humidity, and then demolding.
In the invention, diethylamine and fly ash are fully mixed and reacted by a dry grinding method, and diethylamine molecules are grafted to the surface of the fly ash by covalent bonds. And mixing the prepared functional admixture with Portland cement, and hydrating to obtain the cement-based material with excellent early strength performance. The 1 d compressive strength of the final product can reach 14.5 MPa. The method has the advantages of simple operation, short preparation period, good repeatability, mild conditions, low cost and no need of special equipment. The prepared admixture with the early strength function greatly improves the early strength of the cement-based material.
The present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (6)

1. The preparation method of the early strength type functional admixture is characterized by comprising the following steps:
firstly, mixing fly ash and diethylamine according to the mass ratio of 6-18: 1, weighing, putting the raw material sample into a ball milling tank, and adding a grinding medium;
and secondly, performing ball milling by a dry milling method to enable the fly ash and diethylamine to react, and performing ball milling reaction for 6-10 hours to prepare the early strength type functional admixture.
2. The method as claimed in claim 1, wherein the volume ratio of grinding medium to raw material sample is 3-7: 1.
3. the method as claimed in claim 1, wherein the rotation speed of the ball mill in the ball milling reaction is 200-300 rpm.
4. An early strength functional admixture made by the method of any of claims 1-3.
5. The admixture as defined in claim 4 wherein the fineness is 300-500 mesh.
6. The use of the early strength functional admixture according to claim 4 or 5, comprising the steps of:
1) weighing early strength type functional admixture which accounts for 10-25% of the mass of the cement, adding the admixture into the cement, and stirring the admixture until the admixture is fully mixed to obtain a mixed sample;
2) adding 20-35% by mass of water into the mixed sample, slowly stirring for 20-50 seconds, quickly stirring for 20-50 seconds, standing for 50-100 seconds, and then quickly stirring for 20-50 seconds to obtain a product slurry;
3) pouring the product slurry into a mold, curing at 20 +/-2 ℃ and 95 +/-5% relative humidity, and demolding to obtain the final product.
CN201911422517.9A 2019-12-31 2019-12-31 Early strength type functional admixture and preparation method and use method thereof Pending CN110981250A (en)

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CN112408882A (en) * 2020-11-25 2021-02-26 山西凯迪建材有限公司 Preparation method of geopolymer pavement repair material resistant to chloride ion corrosion

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Publication number Priority date Publication date Assignee Title
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