CN115321869A - Easy-flowing type auxiliary cementing material, preparation method and application thereof - Google Patents
Easy-flowing type auxiliary cementing material, preparation method and application thereof Download PDFInfo
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- CN115321869A CN115321869A CN202210984279.6A CN202210984279A CN115321869A CN 115321869 A CN115321869 A CN 115321869A CN 202210984279 A CN202210984279 A CN 202210984279A CN 115321869 A CN115321869 A CN 115321869A
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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
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
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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
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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
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
- C04B40/0046—Premixtures of ingredients characterised by their processing, e.g. sequence of mixing the ingredients when preparing the premixtures
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- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding
Abstract
The invention discloses a flow-easy type auxiliary cementing material, a preparation method and application thereof, belongs to the technical field of building materials, and solves the technical problems of poor wrapping property and flowability of low-grade concrete in the prior art due to less use amount of the cementing material. The raw materials of the easy-flowing auxiliary cementing material comprise 30-60 parts of lithium slag, 0-40 parts of stone chips or stone powder, 0-70 parts of titanium slag and a modified material accounting for 0.5-1.5wt.% of the total amount of the raw materials. The preparation method of the easy-flowing auxiliary cementing material comprises the following steps: and grinding the dried raw materials to obtain the product. The invention also provides application of the easy-flowing auxiliary cementing material in preparation of low-grade self-compacting concrete. The auxiliary cementing material is used for replacing cement in equal amount, self-compacting concrete can be prepared under the same cementing material dosage as common low-grade concrete, and the obtained self-compacting concrete expansion degree and T500 expansion time can respectively reach SF2 grade and VS1 grade specified in JGJ/T283-2012 'self-compacting concrete application technical specification'.
Description
Technical Field
The invention belongs to the technical field of building materials, and particularly relates to an easy-flowing auxiliary cementing material, and a preparation method and application thereof.
Background
The concrete admixture is used for improving the performance of concrete, and natural or artificial powdery mineral substances capable of improving the performance of concrete are added in the concrete during mixing. At present, the JG/T486-2015 composite mineral admixture for concrete is classified into a common type, an easy-flowing type and an early-strength type according to the standard.
In the engineering application of China, high-rise structures, complex structures and special-shaped structures are more and more; however, the special-shaped structure, the complex structure and the high-rise structure are usually internally provided with dense reinforcing bars and difficult to vibrate, and the requirement on the working performance of concrete is higher and higher. The concrete with medium and low strength grades such as C30 is mainly applied to house construction projects, but the medium and low-strength concrete has poor wrapping property and flowability due to the small using amount of cementing materials, is difficult to pour and construct a high-rise structure, a complex structure and a special-shaped structure, is difficult to vibrate and compact, and is easy to cause pipe blockage and pipe explosion due to poor workability in pumping construction. In the prior art, the dosage of the cementing material of the common C30 concrete is usually 320-350 kg/m3, and in order to enable the C30 concrete to achieve the working performance of the self-compacting concrete, the dosage of the cementing material of the concrete is usually required to be increased to 400-430 kg/m3, which greatly increases the production cost of the concrete and does not meet the requirements of economy and low carbon.
Therefore, it is an urgent need to solve the problems of the art to provide a concrete admixture for improving the fluidity of the concrete with medium and low strength grade.
Disclosure of Invention
One of the purposes of the invention is to provide a flow-easy type auxiliary cementing material, which solves the technical problems of poor wrapping property and fluidity of low-grade concrete in the prior art due to less use amount of the cementing material.
The second purpose of the invention is to provide a preparation method of the easy-flowing auxiliary cementing material.
The invention also aims to provide application of the easy-flowing auxiliary cementing material.
The fourth purpose of the invention is to provide a low-grade self-compacting concrete with low consumption of glue materials.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
the invention provides a flow-easy type auxiliary cementing material which is prepared from the following raw materials in parts by weight:
30-60 parts of lithium slag, 0-40 parts of stone chips or stone powder, 0-70 parts of titanium slag and a modified material accounting for 0.5-1.5% of the total mass of the lithium slag, the stone chips or the stone powder and the titanium slag.
In some embodiments of the invention, the composition is prepared from the following raw materials in parts by weight: 40-60 parts of lithium slag, 10-30 parts of stone chips or stone powder, 30-50 parts of titanium slag and a modified material accounting for 1.0-1.5% of the total mass of the lithium slag, the stone chips or the stone powder and the titanium slag.
The lithium slag is generated after lithium is extracted from spodumene or lepidolite to prepare lithium carbonate. The invention adopts the lithium slag with higher activity as a component material to ensure the activity index of the concrete admixture, and simultaneously utilizes the lithium slag with lower density (about 2400 kg/m) 3 ) The characteristic of larger specific surface area ensures that the concrete obtained by utilizing the concrete admixture has more concrete slurry and better cohesiveness.
The titanium slag powder is obtained by cooling molten slag which takes silicate minerals and perovskite of titanium as main components when vanadium titano-magnetite is taken as a raw material to smelt pig iron in a blast furnace. The invention adopts vanadium-titanium slag powder with low water demand to improve the water demand of the concrete admixture.
The stone chips or the stone powder are at least one of limestone powder, granite powder or dolomite powder prepared by mechanical grinding, or stone chips generated in the sand making process of an ore preparation machine such as limestone, granite, dolomite or the like or stone powder obtained by dust collection. The invention adopts the stone powder to optimize the particle size distribution of the concrete admixture, reduces the water requirement of the concrete admixture, and simultaneously ensures the good dispersibility of the lithium slag powder by utilizing the viscosity reduction and depolymerization effects of the stone powder.
In some embodiments of the invention, the modified material comprises 65% to 75% by mass of lignosulfonate, 20% to 30% by mass of naphthalenesulfonic acid formaldehyde condensation sodium salt and 3% to 7% by mass of triethanolamine, based on 100%.
In some embodiments of the invention, the lignosulfonate comprises at least one of calcium lignosulfonate, sodium lignosulfonate;
the naphthalene sulfonic acid formaldehyde condensation sodium salt is a powder material, and the content of sodium sulfate is lower than 20 wt%;
the triethanolamine is of analytical grade.
In some embodiments of the invention, the stone powder fluidity ratio is greater than or equal to 95%, and the methylene blue value is less than or equal to 0.5.
The preparation method of the easy-flowing auxiliary cementing material provided by the invention comprises the following steps: grinding the dried raw materials to obtain powder;
preferably, grinding to a sieve residue of a 45-micron square-hole sieve of less than or equal to 12 percent;
preferably, the water content of each dried material is less than or equal to 1 percent.
The invention provides an application of a flow-easy auxiliary cementing material in preparation of low-grade self-compacting concrete.
In some embodiments of the invention, the low grade self-compacting concrete is C30 self-compacting concrete.
The invention provides low-grade self-compacting concrete which comprises the following materials: the readily flowable auxiliary cement of any one of claims 1 to 5, from 65 to 75kg/m 3 165-175kg/m of water 3 190-200kg/m of cement 3 85-95kg/m of fly ash 3 830-940kg/m of sand 3 And crushed stone 900-1010kg/m 3 4.5-6.5kg/m of water reducing agent 3 。
In some embodiments of the invention, the cement is a 42.5 grade portland cement or ordinary portland cement,
the fly ash is I-grade or II-grade fly ash,
the sand is machine-made sand or natural sand with fineness modulus of 2.3-3.0 meeting the II-zone grading requirement,
the crushed stone has a particle size of 5-16 mm or 5-20 mm.
The expansion degree and the expansion time of the self-compacting concrete with the low grade can respectively reach SF2 grade and VS1 grade specified in JGJ/T283-2012 'technical specification for application of self-compacting concrete'.
Compared with the prior art, the invention has the following beneficial effects:
1. the invention has scientific design and ingenious conception, realizes the functionalization of the composite admixture by utilizing solid wastes such as lithium slag, titanium slag, stone chips or stone powder and the like and modified materials, and prepares the easy-flowing auxiliary cementing material. The invention utilizes the lithium slag, the titanium slag, the stone chips or the stone powder to carry out ternary composition, fully exerts respective characteristics to make up for the shortages, and obtains the easy-flowing auxiliary cementing material with high activity and high fluidity. The auxiliary cementing material has higher activity and slurry-rich water retention effect by mainly utilizing the characteristics of high activity, high water retention and good slurry-rich effect of the lithium slag; the characteristic of small water demand of the titanium slag is utilized to make up the defect of large water demand of the lithium slag, and the water demand of the auxiliary cementing material is improved, so that the titanium slag has a better fluidity ratio; the dispersibility of the lithium slag powder is improved by utilizing the property of deagglomeration and viscosity reduction of the stone chips or stone powder, so that the fluidity ratio of the auxiliary cementing material is further optimized. The modified material provided by the invention has multiple effects of grinding aid, water reduction and the like, has good adaptability with a concrete water reducing agent, and can further optimize the application effect of the easy-flowing auxiliary cementing material in concrete. The invention finally obtains the easy-flowing auxiliary gelled material with the performance superior to the requirement of the easy-flowing admixture in JG/T486-2015 composite admixture for concrete.
2. The easy-flowing auxiliary cementing material can be used for 340-360 kg/m 3 The amount of the cementing material is less than 200kg/m 3 Under the condition of (1), preparing the C30 self-compacting concrete with the expansion degree and the T500 expansion time respectively meeting SF2 grade and VS1 grade requirements of JGJ/T283-2012 'self-compacting concrete application technical specification'. Compared with the common C30 concrete, the dosage of the cementing material of the C30 self-compacting concrete obtained by the invention is not increased, and is reduced by 40-90 kg/m compared with the cementing material of the C30 self-compacting concrete prepared by using fly ash and mineral powder 3 And the method has obvious economic benefit and low carbon effect.
3. The invention can effectively avoid environmental problems and potential safety hazards caused by mass stockpiling of the industrial solid wastes by recycling the industrial solid wastes, can effectively relieve the shortage problem of admixture such as granulated blast furnace slag powder, fly ash and the like, makes contribution to the promotion of ecological environmental protection industry of China, and has good economic benefit and environment-friendly benefit.
Detailed Description
The lithium slag used in the invention is industrial waste slag generated in the production of lithium carbonate; the titanium slag powder is obtained by cooling molten slag which takes silicate minerals and perovskite of titanium as main components when vanadium titano-magnetite is taken as a raw material to smelt pig iron in a blast furnace; the stone chips or the stone powder are limestone powder, granite powder, dolomite powder and the like prepared by mechanical grinding, or stone chips generated in the sand making process of an ore preparation machine such as limestone, granite, dolomite and the like or stone powder obtained by dust collection.
The cement in the embodiment of the invention is 42.5-grade portland cement.
The naphthalene sulfonic acid formaldehyde condensation sodium salt in the embodiment of the invention is a powder material, and the content of sodium sulfate is lower than 20wt.%.
Unless otherwise indicated, all parts in the examples of the present invention refer to parts by weight.
Example 1
This example discloses a flowable auxiliary cementitious material of the present invention, comprising the following raw materials: 40 parts of lithium slag, 50 parts of titanium slag, 10 parts of limestone powder and a modified material accounting for 1.0 percent of the total mass of the lithium slag, the titanium slag and the limestone powder; the modified material comprises the following raw materials in parts by weight: 70 parts of calcium lignosulphonate, 25 parts of naphthalene sulfonic acid formaldehyde condensation sodium salt and 5 parts of triethanolamine.
The preparation method of the easy-flowing auxiliary cementing material of the embodiment comprises the following steps:
and adding the dried lithium slag, titanium slag, limestone powder and modified materials into a ball mill, and grinding for 20min until the screen residue of a 45-micron square-hole sieve is less than or equal to 12%, thereby obtaining the easy-flowing auxiliary cementing material. The moisture content of each dried material is less than 1 percent.
Example 2
This example discloses a flowable type supplementary cementitious material of the present invention, which comprises the following raw materials: 40 parts of lithium slag, 30 parts of titanium slag, 10 parts of granite chips and a modified material accounting for 1.2 percent of the total mass of the lithium slag, the titanium slag and the granite chips; the modified material comprises the following raw materials in parts by weight: 65 parts of calcium lignosulfonate, 30 parts of naphthalene sulfonic acid formaldehyde condensation sodium salt and 5 parts of triethanolamine.
The preparation method of the easy-flowing auxiliary cementing material of the embodiment is the same as that of the embodiment 1.
Example 3
This example discloses a flowable type supplementary cementitious material of the present invention, which comprises the following raw materials: 30 parts of lithium slag, 70 parts of titanium slag and a modified material accounting for 1.5 percent of the total mass of the lithium slag and the titanium slag; the modified material comprises the following raw materials in parts by weight: 75 parts of sodium lignosulphonate, 22 parts of naphthalene sulfonic acid formaldehyde condensation sodium salt and 3 parts of triethanolamine.
The preparation method of the easy-flowing auxiliary cementing material of the embodiment is the same as that of the embodiment 1.
Example 4
This example discloses a flowable type supplementary cementitious material of the present invention, which comprises the following raw materials: 60 parts of lithium slag, 40 parts of titanium slag and a modified material accounting for 0.5 percent of the total mass of the lithium slag and the titanium slag; the modified material comprises the following raw materials in parts by weight: 73 parts of calcium lignosulphonate, 20 parts of naphthalene water reducer powder and 7 parts of triethanolamine.
The preparation method of the easy-flowing auxiliary cementing material of the present example is the same as that of example 1.
Example 5
This example discloses a flowable auxiliary cementitious material of the present invention, comprising the following raw materials: 60 parts of lithium slag, 40 parts of granite chips and a modified material accounting for 0.5 percent of the total mass of the lithium slag and the granite chips; the modified material comprises the following raw materials in parts by weight: 75 parts of calcium lignosulphonate, 20 parts of naphthalene water reducer powder and 5 parts of triethanolamine.
The preparation method of the easy-flowing auxiliary cementing material of the embodiment is the same as that of the embodiment 1.
The free-flowing auxiliary cements obtained in examples 1 to 5 were tested according to the rules of JG/T486-2015 Complex admixtures for concrete, and the results are shown in Table 1.
TABLE 1 Performance test results of easy-flowing auxiliary cementing material
Example 6
This example discloses the preparation of C30 self-compacting concrete using the free-flowing auxiliary cementitious material prepared in example 4, the material composition of which is shown in Table 2.
Table 2 composition of C30 self-compacting concrete of example 6
| Starting materials | Water (I) | Cement | Class I fly ash | Auxiliary cementing material | Sand in zone II | 5-16 mm broken stone | Water reducing agent |
| Dosage/kg/m 3 | 173 | 198 | 90 | 72 | 905 | 942 | 6 |
The preparation method of the C30 self-compacting concrete comprises the following steps:
and (3) adding sand, stone, cement, fly ash and the easy-flowing auxiliary cementing material into a concrete mixer, starting the concrete mixer for stirring for 10s, then adding a mixture of water and a water reducing agent into the mixer, stirring for 60s, taking the mixture out of the mixer, testing various performances and filling the mixture into a mold.
Example 7
This example discloses the preparation of C30 self-compacting concrete using the flowable type supplementary cementitious material prepared in example 4, the material composition of which is shown in Table 3.
Table 3 composition of C30 self-compacting concrete material of example 7
| Raw materials | Water (W) | Cement | Class I fly ash | Auxiliary cementing material | Sand in zone II | Crushed stone of 5-16 mm | Water reducing agent |
| Dosage/kg/m 3 | 168 | 193 | 88 | 70 | 910 | 948 | 6 |
This example is a self-compacting concrete prepared in the same manner as example 6.
Comparative example 1
Compared with the comparative example 6, the C30 self-compacting concrete is prepared from fly ash and mineral powder without adopting a flowable auxiliary cementing material. The material composition of the self-compacting concrete of comparative example C30 is shown in Table 4.
TABLE 4C 30 SELF-COMPACT CONCRETE COMPOSITION FOR COMPARATIVE EXAMPLE 1
| Raw materials | Water (W) | Cement | Class I fly ash | S95 mineral powder | Sand in zone II | Crushed stone of 5-16 mm | Water reducing agent |
| Dosage/kg/m 3 | 184 | 220 | 140 | 40 | 895 | 895 | 5 |
The preparation method of the self-compacting concrete of comparative example C30 was:
and (3) completely adding sand, stone, cement, fly ash and S95 mineral powder into a concrete mixer, starting the concrete mixer for stirring for 10S, then adding a mixture of water and a water reducing agent into the mixer, stirring for 60S, taking the mixture out of the mixer, testing various performances and filling the mixture into a mold.
Performance detection
The C30 self-compacting concretes prepared in examples 6 and 7 and the C30 self-compacting concrete prepared in comparative example 1 were tested for the expansion degree, T500 time and compressive strength at 7d and 28d according to JGJ/T283-2012 "technical specification for self-compacting concrete application" and GB/T50081-2019 "standard for testing physical and mechanical properties of concrete", and the results are shown in table 5.
TABLE 5 physicomechanical Properties of self-compacting concretes prepared in comparative example 1 and example 67
| Extension/mm | T 500 /s | 7d compressive strength/MPa | 28d compressive strength/MPa | |
| Comparative example 1 | 610 | 6.5 | 24.8 | 38.0 |
| Example 6 | 620 | 7.8 | 25.9 | 38.2 |
| Example 7 | 610 | 10.1 | 27.4 | 40.1 |
From table 5, it can be seen that the expansion degree of the self-compacting concrete prepared by using the easily flowing auxiliary cementing material reaches the SF2 grade in JGJ/T283-2012 "self-compacting concrete application technical specification", the expansion time reaches the VS1 grade, the mechanical properties of the self-compacting concrete also meet the requirements of GB/T50107-2010 "concrete strength test and evaluation standard", and no bleeding phenomenon is observed.
The dosage of the cementing material of the self-compacting concrete prepared by the easy-flowing auxiliary cementing material is 340-360 kg/m 3 The cement consumption is less than 200kg/m 3 (ii) a Compared with the common C30 concrete, the dosage of the cementing material of the C30 self-compacting concrete obtained by the invention is not increased, and is reduced by 40-90 kg/m compared with the cementing material of the C30 self-compacting concrete prepared by using fly ash and mineral powder 3 The self-compacting concrete with better fluidity and basically consistent mechanical property can be obtained by adopting less cementing materials, and the self-compacting concrete has obvious economic benefit and low carbon effect.
Finally, it should be noted that: the above embodiments are merely preferred embodiments of the present invention to illustrate the technical solutions of the present invention, and not to limit the technical solutions, and certainly not to limit the patent scope of the present invention. However, all the insubstantial changes or modifications made without departing from the spirit and spirit of the invention are intended to be included within the scope of the invention; in addition, the technical scheme of the invention is directly or indirectly applied to other related technical fields, and the technical scheme of the invention is included in the patent protection scope of the invention.
Claims (10)
1. The easy-flowing auxiliary cementing material is characterized by being prepared from the following raw materials in parts by weight:
30-60 parts of lithium slag, 0-40 parts of stone chips or stone powder, 0-70 parts of titanium slag and a modified material accounting for 0.5-1.5% of the total mass of the lithium slag, the stone chips or the stone powder and the titanium slag.
2. The easy-flowing supplementary cementitious material of claim 1, prepared from raw materials comprising, by weight: 40-60 parts of lithium slag, 10-30 parts of stone chips or stone powder, 30-50 parts of titanium slag and a modified material accounting for 1.0-1.5% of the total mass of the lithium slag, the stone chips or the stone powder and the titanium slag.
3. A flowable supplementary cementitious material as claimed in claim 1 or claim 2 characterised in that the said modifying material comprises, by mass, from 65% to 75% of lignosulfonate, from 20% to 30% of sodium salt of a naphthalene sulphonate formaldehyde condensate and from 3% to 7% of triethanolamine, based on 100%.
4. The easy-flow auxiliary cementitious material according to claim 3, characterised in that the lignosulfonate comprises at least one of calcium lignosulfonate, sodium lignosulfonate;
the naphthalene sulfonic acid formaldehyde condensation sodium salt is a powder material, and the content of sodium sulfate is lower than 20 wt%;
the triethanolamine is of analytical grade.
5. A flowable type supplementary cementitious material as claimed in claim 1 or 2, characterised in that the stone dust fluidity ratio is not less than 95% and the methylene blue value is not more than 0.5.
6. A process for the preparation of a flowable supplementary cementitious material according to any of claims 1 to 5, characterised in that it comprises the following steps: grinding the dried raw materials to obtain the powder;
preferably, grinding to a sieve residue of a 45-micron square-hole sieve of less than or equal to 12 percent;
preferably, the water content of each dried raw material is less than or equal to 1 percent.
7. Use of a flowable supplementary cementitious material according to any one of claims 1 to 5 in the preparation of low grade self compacting concrete.
8. The use according to claim 7, characterized in that the low grade self-compacting concrete is C30 self-compacting concrete.
9. A low-grade self-compacting concrete is characterized by comprising the following materials: the readily flowable auxiliary cement of any one of claims 1 to 5, from 65 to 75kg/m 3 165-175kg/m of water 3 190-200kg/m of cement 3 85-95kg/m of fly ash 3 830-940kg/m of sand 3 And crushed stone 900-1010kg/m 3 4.5-6.5kg/m of water reducing agent 3 。
10. The low grade self-compacting concrete of claim 9, wherein: the cement is 42.5-grade portland cement or ordinary portland cement,
the fly ash is I-grade or II-grade fly ash,
the sand is machine-made sand or natural sand with fineness modulus of 2.3-3.0 meeting the II-zone grading requirement,
the crushed stone has a particle size of 5-16 mm or 5-20 mm.
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