CN104556785B - Water reducing type metakaolin base slight expansion compacting agent and preparation method thereof - Google Patents
Water reducing type metakaolin base slight expansion compacting agent and preparation method thereof Download PDFInfo
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- CN104556785B CN104556785B CN201510040710.1A CN201510040710A CN104556785B CN 104556785 B CN104556785 B CN 104556785B CN 201510040710 A CN201510040710 A CN 201510040710A CN 104556785 B CN104556785 B CN 104556785B
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Abstract
The present invention relates to a kind of water reducing type metakaolin base slight expansion compacting agent and preparation method thereof, it includes the component A being made up of metakaolin, polycarboxylate water-reducer powder and Gypsum Fibrosum and the B component being made up of Calx, wherein, the each constituent content of described component A is metakaolin 85% 94.5%, polycarboxylate water-reducer powder 0.5% 5%, Gypsum Fibrosum 5 10%, mass percent, described B component accounts for component A gross mass 1 5%.The method have the advantages that 1) significantly improve the service behaviour of concrete；2) volume stability of concrete is improved；3) early strength of concrete is significantly improved.
Description
Technical field
The invention belongs to building material technical field, be specifically related to a kind of water reducing type metakaolin base slight expansion compacting agent and preparation thereof
Method.
Background technology
Cement industry is typical resource, energy resource consumption type industry, is the serious industry of environmental pollution.And produce 1 ton of cement and need
Consume 1.1 tons of limestone, give off nearly 1 ton of CO2.And in recent years, green is built by key industry developed countries and regions in the world
The development of material is all paid much attention to, and climate change has also beaten alarm bell for the people of other countries.Active development utilizes high-performance auxiliary
Help Binder Materials, utilize low grog to produce high-quality goods, reduce energy consumption and material consumption, to reduce the negative effect to environment,
Walk Sustainable Development Road, for social development, there is important reality and far-reaching significance.
Metakaolin is a kind of Silicon-rich aluminate matter inorganic mineral, Kaolin take off after proper temperature (500～1000 DEG C) is calcined
Water is formed, and has the strongest pozzolanic activity, applies to cement concrete, mortar and other cement as activity extra material
In product.Along with the building trade wilderness demand to high performance concrete, mineral admixture seems in preparation high performance concrete
Particularly important.Contrasting each mineral admixture application present situation in cement-based material, metakaolin is with its superior performance, at water
Application in cement concrete has preferable economic benefits and bright prospects.
But, metakaolin can improve high-strength concrete early strength, improves its later stage performance, and these are just being built upon higher ridge
On the basis of soil high activity and large specific surface area.When preparing high performance concrete, metakaolin is as mineral admixture often
There are the following problems in meeting:
1) due to metakaolin, there is higher specific surface area (>=2300m2/ kg) and layer structure, water absorption is relatively strong and layer structure
It is unfavorable for intergranular relative movement, causes working performance of concrete poor, thus affect pumpability and the fillibility of concrete,
The final later stage performance affecting concrete；
2) due to metakaolin, there is higher fineness, cause it to be easy to reunite, be difficult to dispersion, thus be unfavorable for higher
The performance of ridge soil active effect.Therefore, metakaolin is evenly dispersed in cement concrete could more effectively play its fire
Mountain ash effect and filling effect；
Singly mix metakaolin and can significantly reduce the service behaviour of concrete, even affect normal construction.Current way is in order to ensure
Mix the service behaviour of the concrete of metakaolin, be to use individually to mix in concrete metakaolin and water reducer to use,
This kind of way can not make metakaolin be uniformly dispersed in cement concrete at all, does not more make good use of the activity of metakaolin
And its layer structure characteristic, thus the effect that this way improves working performance of concrete and intensity in actual application does not shows
Write.
For ensureing the metakaolin fully dispersed and enhancing in concrete, it is the most necessary for being modified metakaolin.
Summary of the invention
It is an object of the invention to provide a kind of water reducing type metakaolin base slight expansion compacting agent and preparation method thereof, it can give mixed
Solidifying soil excellent service behaviour, the strongest, good volume stability.
The present invention solves above-mentioned technical problem the technical scheme is that water reducing type metakaolin base slight expansion compacting agent, its bag
Include by the component A being made up of metakaolin, polycarboxylate water-reducer powder and Gypsum Fibrosum and the B component being made up of Calx, wherein,
The each constituent content of described component A is metakaolin 85%-94.5%, polycarboxylate water-reducer powder 0.5%-5%, Gypsum Fibrosum 5-10%,
Mass percent, described B component accounts for component A gross mass 1-5%.
By such scheme, described metakaolin is that Kaolin is calcined 0.5-6.0 hour at a temperature of 500-1000 DEG C through grinding
Rear cooling prepares, wherein, and SiO in described metakaolin2With Al2O3Weight/mass percentage composition sum >=50wt%, specific surface
Long-pending >=2300m2/kg。
By such scheme, described polycarboxylate water-reducer mean molecule quantity is 11000-15000, the molecule of described polycarboxylate water-reducer
In structure, the polyoxyethylene radix as one of side chain is more than 60.
By such scheme, described Gypsum Fibrosum is dihydrate gypsum, CaSO therein4·2H2O weight/mass percentage composition is more than 90%, compares table
Area is more than 400m2/kg。
The preparation method of described water reducing type metakaolin base slight expansion compacting agent, it is characterised in that: by the higher ridge through drying
Soil is put in wet method ceramic ball mill, is subsequently adding Gypsum Fibrosum, and polycarboxylate water-reducer obtains mixture, adds water, and makes mixture and water
Mass ratio be 1:1 1:1.5, milling time is 30-60min, obtains metakaolin base active slurry, then by active slurry
Obtain dried powder i.e. component A by spray drying method, add the B component Calx mixing of the mass fraction 1-5% of component A
Uniformly obtain microdilatancy compacting agent powder.
In water reducing type metakaolin base slight expansion compacting agent preparation process of the present invention, under mechanical action, polycarboxylic acids subtracts metakaolin
Water preparation on the surface of metakaolin, is partially into metakaolin layer structure gap by physical action and chemical action partial adsorbates,
It has two significant functions: one is to make the metakaolin of reunion fully dispersed, and two is the modification to metakaolin particle surface.
Wet method preparation process can make full use of the characteristic of metakaolin, utilizes the layer structure of metakaolin, makes efficiently subtracting of a part
Water preparation enters the interlayer of metakaolin, and a part is adsorbed to the surface of metakaolin, metakaolin base guarantor can be made to mould enhancing and subtract
When water preparation uses, water reducer slowly discharges, and has slow release diminishing and protects the characteristic moulded.Gypsum Fibrosum can be active oxidation in metakaolin
Calcium and aluminium oxide provide enough SO4 2-, strengthened the early strength function of metakaolin by sulphate activation agent, form entringite and improve mixed
Solidifying soil volume stability.And CaO can form Ca (OH)2Promote cement early strength, excite metakaolin to live in early days further
Property, it is possible to prevent the active component moisture absorption in microdilatancy compacting agent powder to affect its activation plays simultaneously.
The method have the advantages that
1) service behaviour of concrete is significantly improved, when in normal concrete, the volume of metakaolin is 5wt%-10wt%, polycarboxylic acids
When water reducer volume is 0.5%, its slump declines at about 40mm-100mm.But, mix and contain the micro-swollen of equal quality
Swollen compacting agent, its slump can improve 50mm-80mm.And due to the diminishing on metakaolin surface in microdilatancy compacting agent
Agent discharges at first, and the water reducer of metakaolin interlayer can slowly discharge, and makes water reducing type metakaolin base slight expansion compacting agent have
Diminishing protects the characteristic moulded；
2) improving the volume stability of concrete, metakaolin is as a kind of concrete mineral admixture, due to its pozzolanic activity
And micro-packing effect, it is possible to significantly reduce the porosity of concrete thus improve its later stage durability.Water reducing type metakaolin base is micro-
Expand compacting agent can more preferably be dispersed in concrete due to its effective ingredient metakaolin, improve the component such as metakaolin, Gypsum Fibrosum
Active reaction rate, it is possible to be greatly improved the compactness of concrete, thus be effectively reduced volume of concrete and shrink.Therefore, subtract
Water type metakaolin base slight expansion compacting agent can significantly improve the volume stability of concrete, improves the endurance quality of concrete；
3) significantly improve the early strength of concrete, be 220mm in mortar divergence, when water reducing type metakaolin base slight expansion is close
Real agent volume is Binder Materials 10% time, contrast benchmark mortar, mortar 3d comprcssive strength increases about 80%, 28d intensity
Rate of increase also can be maintained at more than 20%, for equal volume dry powder metakaolin, under identical flowing, and its 3d
Rate of increase is its 3 times.Mortar can reach 49.5MPa at 7d, more than the intensity of 42.5 cement 28d ages.This is owing to subtracting
Water preparation is to metakaolin surface modification, and the macromolecule group of water reducer dissolves in water formation locus effect and metakaolin is more had
Effect ground is scattered in Binder Materials, fully makes metakaolin be dispersed in concrete, it is possible to significantly improve the early strength of concrete.
Accompanying drawing explanation
Fig. 1 is the mortar specimen drying shrinkage figure mixing different component.
Detailed description of the invention
In order to be more fully understood that the present invention, it is further elucidated with present disclosure below in conjunction with embodiment, but present disclosure is not
It is limited only to the following examples.
Embodiment 1:
Water reducing type metakaolin base slight expansion compacting agent of the present invention is to be existed by metakaolin, polycarboxylate water-reducer powder, Gypsum Fibrosum and water
Grinding in ball grinder prepares active slurry, then obtains dry powder by spray drying, then addition mass fraction is the stone of 3% in dry powder
Ash.
Described metakaolin be Kaolin cool down after grinding is calcined 0.5-6.0 hour at a temperature of 500-1000 DEG C prepare,
Wherein, SiO in described metakaolin2With Al2O3Weight/mass percentage composition sum >=50wt%, specific surface area >=2300m2/kg；
Described polycarboxylate water-reducer mean molecule quantity is 11000-15000, in the molecular structure of described polycarboxylate water-reducer as side chain it
The polyoxyethylene radix of one is more than 60；Described Gypsum Fibrosum is dihydrate gypsum, CaSO therein4·2H2O weight/mass percentage composition is more than
90%, specific surface area is more than 400m2/kg。
Wherein mass percent shared by metakaolin in the middle of component A, polycarboxylate water-reducer powder, Gypsum Fibrosum is respectively as follows: Gypsum Fibrosum and accounts for
The 8% of the mass fraction of metakaolin.And polycarboxylate water-reducer powder accounts for the 0.5-5% of mass fraction of metakaolin.The most only starch
Fluidity experiment completes with reference to GB/T 8077-2000 " Methods for testing uniformity of concrete admixture ", the most only starches employing
The ratio of mud be 0.29, Mortar'S Flowability completes with reference to GB/T 2419-2005 " flow of cement mortar ", wherein mortar
Using the ratio of mud is 0.5.Table 1 is the impact on cement fluidity of the water reducing type metakaolin base slight expansion compacting agent different ratio.
Cement fluidity is affected by table 1 water reducing type metakaolin base slight expansion compacting agent
Be can be seen that the increase of volume along with water reducing type metakaolin base slight expansion compacting agent by table 1, paste flowing degree is gradually
Increasing, water-reducing rate increases, and along with the increasing of volume of water reducer, 30min gradual loss diminishes.Table 1 illustrates metakaolin
Base slight expansion compacting agent has higher water-reducing effect, and makes to utilize the slow releasing function of water reducer, makes water reducing type metakaolin base micro-
Expand compacting agent and there is the characteristic that diminishing guarantor moulds.
Embodiment 2:
Using mortar specimen as investigating object, metakaolin and water reducing type metakaolin base slight expansion compacting agent all with 6%, 8%,
10% equivalent replaces Binder Materials configuration mortar.Wherein water reducer is polycarboxylate water-reducer powder.Control the ratio of mud, and according to GB/T
2429 2005 " Test method for fluidity of cement mortar " test benchmark sample, metakaolin sample, water reducing type metakaolin base are micro-swollen
The fluidity of the mixture of swollen compacting agent 1-3 makes experimental group have identical fluidity at 220 ± 10mm；According to GB/T
17671-1999 " Test method for strength of hydraulic cement mortar ", with omnipotent pressure testing machine test benchmark sample and 3 days of example, 7 days and
28 days comprcssive strength.Wherein, metakaolin 1-3 is metakaolin and water reducer individually mixes with powder, water reducing type metakaolin
Metakaolin in base slight expansion compacting agent 1-3: Gypsum Fibrosum: polycarboxylate water-reducer (i.e. component A)=92%:6%:2%.Wherein
Calx accounts for the 4% of component A gross mass.
The intensity of table 2 mortar specimen
Table 2 illustrates: water reducing type metakaolin base slight expansion compacting agent 1-3 for benchmark sample, the equal table of each age strength
Revealing significantly growth, 3d rate of increase may be up to 77.8%.For contrasting the 3d intensity of equal volume metakaolin sample, intensity
Rate of increase is respectively 30%, 43.0% and 36.4%, illustrate the present invention to prepare water reducing type metakaolin base by wet processing micro-swollen
Swollen compacting agent has, relative to the metakaolin being dry mixed and water reducer, the effect of more obviously promoting the strong.
Selecting the match ratio of water reducing type metakaolin base slight expansion compacting agent 2, with reference to JCJ/T 70-2009 standard, all test specimens exist
In the die trial of 3 25mm × 25mm × 280mm, molding is placed on temperature is 20 DEG C, the relative humidity condition more than 90%RH
Lower maintenance.Form removal be placed on temperature be 20 DEG C, relative humidity be 60%RH environment in maintenance, survey the most respectively its 3d, 5d,
7d, 14d and 28d length.
The expansion rate following formula of test specimen calculates:
In formula: εt-test specimen is in the expansion rate (%) of t days ages；
lt-test specimen is in the length (mm) of t days ages；
l0The datum length (mm) of-test specimen；
ldThe length (mm) of-gauge head (i.e. burying nail)；
Fig. 1 illustrates: when the volume of water reducing type metakaolin base slight expansion compacting agent is 8%, for metakaolin, micro-
Expand compacting agent and more can significantly reduce the dry shrinkage of mortar specimen.Illustrate that the present invention is more beneficial for the volume stability of mortar.
Embodiment 3:
A kind of water reducing type metakaolin base slight expansion compacting agent wherein metakaolin: Gypsum Fibrosum: polycarboxylate water-reducer (i.e. component A)
=90%:8%:2%, Calx accounts for the 3% of component A gross mass.
With concrete sample for investigating object, metakaolin and water reducing type metakaolin base slight expansion compacting agent are all with 10% equivalent
Replacing Binder Materials configuration concrete, water reducer is polycarboxylic acids dehydragent.According to GB/T 50,080 2002 " normal concrete
Mixture method for testing performance standard " slump of mixture of test benchmark sample and example 1；According to GB/T 50081-2002
" standard for test methods of mechanical properties of ordinary concrete ", with omnipotent pressure testing machine test benchmark sample and 3 days of example, 7 days and
28 days comprcssive strength.
The slump and the intensity experiment of concrete sample example 1 the results are shown in Table 3.
The table 3 concrete match ratio when slump
Table 1 illustrates: when in example 1, the volume of microdilatancy compacting agent is 10%, in the case of being not added with water reducer, it is right
The improvement result of rheological property is for the metakaolin of equal volume, the most obvious.Simultaneously for 3d intensity, real
Example 1 reaches 21.8% relative to the metakaolin rate of increase of equal volume, and within 28 days, strength growth rate is 35.8%.Water reducing type is described
Metakaolin base slight expansion compacting agent is suitable for preparing the high performance concrete of early strength micro expansion.
Claims (2)
- null1. the preparation method of water reducing type metakaolin base slight expansion compacting agent，Described water reducing type metakaolin base slight expansion compacting agent includes by metakaolin、Polycarboxylate water-reducer powder and the component A of Gypsum Fibrosum composition、And the B component being made up of Calx，Wherein，The each constituent content of described component A is metakaolin 85%-94.5%，Polycarboxylate water-reducer powder 0.5%-5%，Gypsum Fibrosum 5-10%，Mass percent，Described B component accounts for component A gross mass 1-5%，It is characterized in that: will put in wet method ceramic ball mill through the metakaolin dried，It is subsequently adding Gypsum Fibrosum，Polycarboxylate water-reducer obtains mixture，Add water，Making mixture is 1:1 1:1.5 with the mass ratio of water，Milling time is 30-60min，Obtain metakaolin base active slurry，Then active slurry is obtained dried powder i.e. component A by spray drying method，The B component Calx mix homogeneously of the mass fraction 1-5% adding component A obtains microdilatancy compacting agent powder.
- The preparation method of water reducing type metakaolin base slight expansion compacting agent the most according to claim 1, it is characterized in that: described metakaolin be Kaolin cool down after grinding is calcined 0.5-6.0 hour at a temperature of 500-1000 DEG C prepare, wherein, SiO in described metakaolin2With Al2O3Weight/mass percentage composition sum >=50wt%, specific surface area >=2300m2/kg；Described polycarboxylate water-reducer mean molecule quantity is 11000-15000, and in the molecular structure of described polycarboxylate water-reducer, the polyoxyethylene radix as one of side chain is more than 60；Described Gypsum Fibrosum is dihydrate gypsum, CaSO therein4·2H2O weight/mass percentage composition is more than 90%, and specific surface area is more than 400m2/kg。
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| CN105731943B (en) * | 2016-01-25 | 2017-12-12 | 茂名高岭科技有限公司 | A kind of closely knit enhanced mortar waterproof agent |
| CN107512861A (en) * | 2016-06-17 | 2017-12-26 | 卡本复合材料（天津）有限公司 | A kind of new metakaolin base concrete waterproofing and anti-leakage agent |
| CN108264315A (en) * | 2016-12-30 | 2018-07-10 | 江苏苏博特新材料股份有限公司 | Controllable mortar for building of expansion and preparation method thereof |
| CN106986573B (en) * | 2017-04-12 | 2020-05-15 | 茂名高岭科技有限公司 | Metakaolin-phosphogypsum-based enhanced cement-based material shrinkage reducing agent and preparation method thereof |
| CN111099600B (en) * | 2019-12-31 | 2021-11-26 | 内蒙古超牌新材料股份有限公司 | Production method of metakaolin with low water demand and high activity and metakaolin prepared by production method |
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| CN100455533C (en) * | 2006-04-21 | 2009-01-28 | 华南理工大学 | A novel masonry cement |
| CN103253916B (en) * | 2013-04-15 | 2016-01-06 | 武汉理工大学 | A kind of hardening accelerator for improving phosphogypsum base cement concrete strength and preparation method thereof |
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Effective date of registration: 20220905 Address after: 430070 Hubei Province, Wuhan city Hongshan District Luoshi Road No. 122 Patentee after: WUHAN University OF TECHNOLOGY Patentee after: BEIHAI GAOLING SCIENCE & TECHNOLOGY CO.,LTD. Address before: 430070 Hubei Province, Wuhan city Hongshan District Luoshi Road No. 122 Patentee before: WUHAN University OF TECHNOLOGY Patentee before: MAOMING KAOLIN SCIENCE AND TECHNOLOGY CO.,LTD. |