CN106365486B - A kind of concrete compaction antimitotic agent - Google Patents
A kind of concrete compaction antimitotic agent Download PDFInfo
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- CN106365486B CN106365486B CN201610790540.3A CN201610790540A CN106365486B CN 106365486 B CN106365486 B CN 106365486B CN 201610790540 A CN201610790540 A CN 201610790540A CN 106365486 B CN106365486 B CN 106365486B
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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
- C04B40/0042—Powdery mixtures
Abstract
A kind of concrete compaction antimitotic agent, comprising: the light calcined magnesia of 20.0-60.0%；The double expansion sources expansive clinkers of the calcium oxide of 10.0%-30.0%-calcium sulphoaluminate class；The gypsum of 5.0-15.0%；The specific surface area of 20.0-50.0% is greater than 300m2The fine powder material of/kg, the summation of all components content is 100%, in terms of the gross mass of antimitotic agent.The antimitotic agent can be used in concrete, for effectively inhibiting the contraction of concrete, improve density, the durability of concrete.
Description
Technical field
The invention belongs to additive for building material fields, are specifically related to a kind of additive for concrete, prevent from mixing
There is the closely knit antimitotic agent of high-performance in crack in solidifying soil.
Background technique
For concrete base building, since concrete itself will appear drying shrinkage, while ambient temperature variation also can be to building
It builds object to have an impact, will lead to concrete base building and crack occur.Building tear has direct shadow to the durability of building
It rings.If be not controlled, or even the danger of building collapse can be caused.
For the angle of material, cement expansive material, economization agent, steel fibre and synthetic organic fibre are all deduction and exemption or divide
The effective measures of spallation seam.But in terms of material price and convenient construction, swelling agent is advantageously.The crack master that building generates
If being to provide cement expansive material due to caused by concrete shrinkage, the contraction changed over time with compensating concrete is solution
Certainly there is the most common technological means in crack in building.
Swelling agent is added in concrete, main function is the cracking resistance and anti-permeability performance for improving concrete, realizes knot
Structure self waterproofing also contributes to the anti-sulphates corrosive and the effect of alkali resistant-aggregate reaction that improve concrete to a certain extent,
The use of visible expansion agent improves the effect of concrete durability objectively also functioning to.But there is high endurance requirement to some
Concrete and building, or the concrete used in the strong environment of surrounding medium corrosion function are applied alone common swelling agent just difficult
To meet concrete durability requirement.
For specific coagulation local soil type at the expansion sources for commonly using cement expansive material are calcium hydroxide, entringite.Long-term
Engineer application in, discovery using calcium hydroxide, entringite, as the swelling agent of expansion sources, there are many deficiencies.
The major defect of entringite class swelling agent is that (1) aquation is very fast, before expansion occurs mainly in 14d, to cement
The compensating action that the sill later period shrinks is little；The adjustability of expansion character is poor, cannot be special according to the contraction of designed concrete
Point is to adjust, design expansion character；(2) entringite thermal stability is poor, easily decomposes under the conditions of 80 DEG C；(3) entringite class expands
Agent water requirement is high, excessively high for maintenance humidity requirement, and usual engineering maintenance is difficult to meet the curing requirements of entringite class swelling agent.
There is also expand too fast, the disadvantage of expansion process adjustability difference, in hot weather construction item for calcium hydroxide kind swelling agent
Usual one day expansion energy can react 80% or more under part, it is difficult to and compensating concrete temperature drop is shunk and the dry of later period is shunk, and
Its expansion sources Ca (OH)2Under pressure water action, solubility is also larger.Therefore, based on the existing concrete of both expansion sources
Swelling agent water conservancy project, marine worker or have etching medium (sulfate) concrete works in application be restricted, in summer
Under execution conditions can not effective compensation concrete contraction.Light calcined magnesia has expanded product physicochemical characteristics to stablize,
Expand the advantages that controllable.Different activities magnesia can be used for season, effective compensation concrete temperature drop is shunk and the later period
It is dry to shrink.
In view of the shortcomings of the prior art and defect, a kind of selected composite expanded it is an object of the invention to propose
Agent shrinks for the contraction of compensating concrete, including temperature shrinkage and later period, improves working performance of concrete, improve density,
It realizes self waterproofing, improve crack-resistant performance of concrete and endurance quality.
Summary of the invention
Applicant have unexpectedly found that concrete institute can be assigned by the concrete compaction antimitotic agent including following composition
The expansion of need, closely knit performance make concrete have long-term anti-expansion character, including, by weight:
The light calcined magnesia of 20.0-60.0%；
The double expansion sources expansive clinkers of the calcium oxide of 10.0%-30.0%-calcium sulphoaluminate class；
The gypsum of 5.0-15.0%；
The fine powder material of 20.0-50.0%；
Wherein all components are with the dry weight of antimitotic agent, and the content summation of all components is 100%.
In one embodiment, light calcined magnesia is mineral resources containing magnesium, such as magnesite, dolomite, serpentine, in 800-
Calcining obtains at 1100 DEG C, preferably 900-1050 DEG C.The activity of the light calcined magnesia is the stable oxygen of the weight of 50s-400s
Change magnesium, the homogeneity control ± 20s of MgO activity.
In another embodiment, the double expansion sources expansive clinkers of calcium oxide-calcium sulphoaluminate class include (by weight):
SiO23.03%~4.27%, Al2O36.05%~6.90%, Fe2O31.20%~2.03%, CaO 72.8%~
78.5%, MgO 1.37%~1.72%, SO36.81%~10.72%, wherein f-CaO 53.5%~58.8%.
In yet another embodiment, gypsum can be fluorgypsum, ardealite, desulfurized gypsum, dihydrate gypsum or anhydrite,
Wherein preferred anhydrite, the anhydrite include at least, by weight, CaO 37.1%~43.8%, SO356.6%~
59.6%.
In a further embodiment, fine powder material can be ultra-fine mountain flour, super finely ground slag or other fine powder materials, preferably lime stone
Powder, because agstone mineral products are abundant, grindability is good, good with the compatibility of other components.The specific surface area of fine powder material is greater than
300m2/ kg, preferably greater than 500m2/ kg, more preferably greater than 800m2/kg。
Concrete compaction antimitotic agent containing light calcined magnesia is mainly used in concrete, for cracking resistance, makes concrete compaction.
Volume of the antimitotic agent in concrete is about 8.0%~12.0% (weight percent).
In concrete batching, replace other concrete admixtures by above-mentioned volume, in the condition that other conditions are constant
Lower concrete batching.
Compared with prior art, concrete compaction antimitotic agent of the invention has the following advantages that and effect:
1) autogenous volume of compensating concrete early period is shunk；2) the dry of compensating concrete early period is shunk；It 3) being capable of complete cycle
Phase compensating concrete is shunk；4) density of concrete is improved；5) heat of hydration is reduced；6) crack-resistant performance of concrete and resistance to is improved
Long performance；7) current swelling agent is overcome to the heavy dependence of natural anhydrite；8) expansion character is controllable.
Detailed description of the invention
Fig. 1 is concrete confined shrinkage split test mold；
Fig. 2 is the temperature simulation curve for simulating half waterproof state of building site；
Fig. 3 is the strain curve for simulating half waterproof state of building site；
Fig. 4 is the design drawing in the film studio S08, and bend filling region is accessory occupancy；
Fig. 5 is the effect picture after film studio construction.
Specific embodiment
There is provided herein it is a kind of can effective compensation concrete shrinkage, reduce concrete cracking, improve endurance performance of concrete
Concrete compaction antimitotic agent.Concrete compaction antimitotic agent provided by the present invention takes full advantage of calcium oxide-calcium sulphoaluminate class
The interaction of double expansion sources expansive clinkers, light calcined magnesia, gypsum, fine powder material, the content of selected each component and it is obtained
Antimitotic agent, therefore obtained concrete compaction antimitotic agent has better cracking resistance, percolation-proof effect, so that concrete is more solid
It is durable.
It include light calcined magnesia, calcium oxide-sulphur the present invention provides a kind of concrete compaction antimitotic agent for concrete
The double expansion sources expansive clinkers of calcium aluminate class；Gypsum；Fine powder material and optional other components.
Light calcined magnesia
Light calcined magnesia is selected, in the closely knit antimitotic agent of the composite concrete that can be advantageously utilised in the present invention.Magnesia
It is common a kind of ingredient in swelling agent and expanding cement, belongs to the cementing material of air-setting, it can be by calcining selected from for example
The mineral resources containing magnesium of magnesite obtains.The magnesia that can be used in closely knit antimitotic agent includes many kinds, such as conventional magnesia, light
Burned magnesium oxide, dead burned magnesia etc..Light calcined magnesia will affect product since calcination temperature is different, the difference of calcination time
Property.Such as at 400 DEG C of calcination temperature, the specific surface area of obtained light calcined magnesia is 180m2/kg；It is calcined at 1300 DEG C
When the obtained specific surface area of light calcined magnesia be only 3m2/kg.It is selected at 800-1100 DEG C in the present invention, preferably 900-1050
The light calcined magnesia calcined at DEG C.
The selected mineral resources by dolomite, magnesite, serpentine etc. of light calcined magnesia in the present invention, control are calcined and are obtained
The homogeneous light calcined magnesia arrived.Preferred mineral resources is magnesite, especially with high purity, such as purity is higher than 70% magnesite
Mine preferably mixes the mineral resources mixture calcined after other mineral resources containing magnesium such as dolomite in the magnesite.The mineral resources mixture
In based on magnesite, be optionally added the mineral resources containing magnesium such as dolomite, serpentine, preferably the incorporation of dolomite etc. is less than 30% weight
Amount, more preferably less than 20% weight, even more preferably less than 15% weight, more preferably less than 10% weight.Obtain mineral resources mixing
After object, ground to obtain average grain diameter less than 15 centimetres, preferably smaller than 10 centimetres, even more preferably from 5 centimetres, most preferably 3 centimetres,
Or 1 centimetre of small block mineral resources below.The mineral resources is calcined at 800-1100 DEG C.The supply of fuel is controlled in calcination process,
Homogenous combustion is carried out, such as by selecting rotary device, such as rotary kiln uniformly, controllably forge to mineral resources raw material
It burns.And specifically, it is preferable to select such as 900-1050 DEG C calcining.In calcination process, flown according to mineral resources composition, average grain diameter, dust
It the factors such as raises, controls calcination condition.For example, preferably revolving speed is lower than 1.5 revs/min when using rotary kiln.Such as 800-
900 DEG C, 901-1000 DEG C, 1001-1100 DEG C, in conjunction with influence factors such as partial size, fugitive dusts, select the revolving speed of rotary kiln for 0.6 turn/
Minute, 1.0 revs/min, 0.8 rev/min of kiln speed below.After calcining 30-90 minutes, preferably calcine 30-50 minutes or 50-70
Minute or 70-90 minutes.Depending on mineral resources raw material, average grain diameter, to the requirement of product, turn of adjustment calcination time, rotary kiln
Speed.In turn, calcined product is ground, preferably grinding is lower than 120 microns in fineness, and preferably 80 microns below
Powder, preferably 80 microns of square hole screens tail over as total weight 10% hereinafter, it is preferred that 5% hereinafter, more preferable 3% or less.
Concrete of the present invention is in closely knit antimitotic agent, the additional amount of light calcined magnesia are as follows: the total weight based on antimitotic agent is
20%-60%, preferably 25%-50%, more preferable 30-45%, even more preferably from about 32-42%.
The active reaction time for the light calcined magnesia of the invention is more than or equal to 50 seconds to less than 300 seconds, preferably
More than or equal to 50 seconds to less than 200 seconds, or it is more than or equal to 200 seconds to less than 300 seconds, and the homogeneity control of the MgO activity
System is within ± 20 seconds, preferably within ± 10 seconds, even more preferably from ± 5 seconds.The active reaction time is total according to the Chinese people
With state power industry standard DL/T5296-2013 " concrete for hydraulic structure mixes magnesia technical specification " measurement.When active reaction
Between it is bigger, indicate light calcined magnesia late expansion it is higher, early period expansion it is smaller.Reactivity time low expansion rate expression early period
Comparatively fast, late expansion is smaller.Light calcined magnesia is forged in rotary kiln using the gases such as natural gas or liquid controllable fuel as fuel
Burn the uniform graininess light calcined magnesia of the weight as obtained from magnesite of mineral resources containing magnesium.After calcined magnesite, need to forging
Magnesite after burning carries out being ground to regulation fineness, i.e. fineness tails over for 80 μm less than 5% weight.
The double expansion sources expansive clinkers of calcium oxide-calcium sulphoaluminate class
In the present invention, calcium oxide and calcium sulphoaluminate expansion component obtain double expansion sources expansive clinkers by calcining.Passing through will
The double expansion sources clinkers of calcium oxide-calcium sulphoaluminate that lime stone, iron powder, gypsum and bauxite are calcined in rotary kiln, system
At double expansion sources clinkers and single calcium oxide, calcium sulphoaluminate class or the directly calcium oxide that mixes and calcium sulphoaluminate class expansion sources
It compares, calcium oxide and the double expansion sources expansive clinkers of calcium sulphoaluminate are brought when cooperating with other components in antimitotic agent of the present invention
The advantages that overall expansion performance is higher, expansion rate (especially expansion rate early period) is high, and dilatancy is controllable, is more advantageous to be formed
The controllable closely knit antimitotic agent of complete period dilatancy.
In the present invention, the double expansion sources expansive clinkers of calcium oxide-calcium sulphoaluminate class include (by weight): SiO23.03%
~4.27%, Al2O36.05%~6.90%, Fe2O31.20%~2.03%, CaO 72.8%~78.5%, MgO
1.37%~1.72%, SO36.81%~10.72%, wherein f-CaO 53.5%~58.8%.It is preferred that calcium oxide-sulphur aluminium
The double expansion sources expansive clinkers of sour calcium include, by the total weight of double expansion sources clinkers, SiO23.13%~4.17%, more excellent
3.23%-4.07% is selected, even more preferably from 3.33%-3.97%；Al2O36.15%~6.80%, more preferable 6.25%-
6.70%, even more preferably from 6.35%-6.60%；Fe2O31.30%~1.93%, more preferable 1.40~1.83%, even more preferably from
1.50%~1.73%；CaO 73.8%~77.5%, wherein f-CaO 54.5%~57.8%；More preferably CaO 74.8%~
76.5%, wherein f-CaO 55.5%~56.8%；MgO 1.47%~1.62%, more preferable MgO 1.52%~1.57%；
SO37.81%~9.72%, more preferable 8.31%~9.22%.In double expansion sources clinkers, preferred component is CaO, especially
Ingredient, the Fe of f-CaO2O3、Al2O3Ingredient need keep within the above range.
Gypsum
In the present invention, the ingredient compounded with light calcined magnesia, the double expansion sources expansive clinkers of calcium oxide-calcium sulphoaluminate further includes
(main component is CaSO to gypsum4).The gypsum can be the usually used gypsum substance in swelling agent field, including fluorgypsum,
Ardealite, desulfurized gypsum, dihydrate gypsum or anhydrite.Wherein preferred anhydrite.The preferred CaSO of gypsum4Content is 70% (weight)
Above gypsum, or wherein CaO, SO3The total gypsum higher than 70% (weight) of content.It is preferred that when selecting anhydrite, it should
Anhydrite includes at least, by weight, CaO 37.1%~43.8%, SO356.6%~59.6%.
Fine powder material
In antimitotic agent of the invention, additionally it is possible to fine powder material, preferably superfine powder be added.The fine powder material being able to use can be
Mountain flour, miberal powder, flyash and some other fine powder materials that can be added in antimitotic agent.The selection of these powders can root
It is selected according to the knowledge of those of ordinary skill in the art.Preferably select mountain flour, especially microlith powder or ultra-fine mountain flour.It is preferred that
The reason of selecting mountain flour is that mountain flour is rich in minerals, and grindability is good, and processing is simple, is easy to combine with other components.Certainly, may be used
With according to required property,
The fineness of powder can be selected by selecting the specific surface area of powder.The surface area of fine powder material is preferably greater than
300m2/ kg, yet more preferably greater than 500m2/ kg, more preferably greater than 700m2/ kg, also more preferably more than 800m2/ kg, most preferably greater than
1000m2/kg.Since the antimitotic agent in the present invention is in concrete, it is contemplated that the factors such as cost, the selection of fine powder material need not
Reach highest standard, generally in 1500m2/ kg is hereinafter, 1200m2/ kg or less.
Other auxiliary agents
Other auxiliary agents, such as fiber substance, including natural fiber, artificial fibre can be added in antimitotic agent of the invention
Dimension；Slow setting guarantor can also be added and collapse ingredient to improve the working performance of concrete.
Concrete compaction antimitotic agent and preparation method thereof
Concrete compaction antimitotic agent include light calcined magnesia, gypsum, the double expansion sources expansive clinker of calcium oxide-calcium sulphoaluminate,
Fine powder material is compounded by said components.The double expansion sources expansive clinkers of calcium oxide-calcium sulphoaluminate class can pass through calcined oxide calcium
It is obtained with calcium sulphoaluminate expansion sources, it is also commercially available to buy, as long as double expansion sources clinker composition requirements needed for meeting.
Light calcined magnesia preferably has the magnesia of following property, as the active reaction time be more than or equal to 50 seconds to less than 400 seconds, it is excellent
Choosing is more than or equal to 50 seconds to less than 200 seconds, or is more than or equal to 200 seconds to less than 300 seconds, and the homogeneity of the MgO activity
Control is within ± 20 seconds, preferably within ± 10 seconds, even more preferably from ± 5 seconds light calcined magnesias.Later, by light-burned oxidation
The double expansion sources expansive clinkers of magnesium, calcium oxide-calcium sulphoaluminate class, gypsum, fine powder material are mixed together, and coagulation of the invention can be obtained
Native closely knit antimitotic agent.
The dosage of each component is 20.0-60.0%, preferably 30.0-50.0%, more preferable 35.0-45.0% in antimitotic agent
Light calcined magnesia；Calcium oxide-calcium sulphoaluminate class of 10.0%-30.0%, preferably 15.0-25.0%, more preferable 18.0-28.0%
Double expansion sources expansive clinkers；5.0-15.0%, preferably 8.0-12.0% or 10.0-15.0%, more preferable 10.0-12.0%
Gypsum；The large specific surface area of 20.0-50.0%, preferably 25.0-45.0% or 20.0-40.0%, more preferable 20.0-30.0%
In 300m2The fine powder material of/kg；The summation of the constituent content is 100%, with the total weight of antimitotic agent.
Concrete compaction antimitotic agent is mainly used in concrete anticracking technology, and the volume in concrete is about 8.0%~
12.0% weight, preferably 9%~11.0% weight, by the total weight of concrete.In concrete batching, by described certain
Volume replaces other concrete admixtures, concrete batching under conditions of other conditions are constant.
General concrete is able to use concrete compaction swelling agent.Compared with prior art, concrete of the invention
Closely knit antimitotic agent has the following advantages that and effect: 1) can compensating for full period concrete shrinkage, including concrete early stage it is spontaneous
Volume contraction, temperature drop are shunk and middle and later periods dry contraction.；2) expansion water requirement is smaller, conventional to support to maintenance without particular/special requirement
Shield；3) crack-resistant performance of concrete and endurance quality are improved, this is extremely important to building；4) current swelling agent is overcome
To the heavy dependence of natural anhydrite；5) expansion character of antimitotic agent can design, controllable；It 6) can be more under the conditions of summer high temperature
Expansion is played well, effectively controls distress in concrete.
Concrete, to the effect of prestressed of concrete or building, is concentrated mainly on concrete use with closely knit antimitotic agent in the past
Early period or later period, the closely knit antimitotic agent of this paper can either adjust the generation of concrete or building fracture early period, also can
The crack for enough controlling the later period generates.The control can be by adjusting light calcined magnesia, stone in content range disclosed herein
Cream, calcium oxide-calcium sulphoaluminate, fine powder material composition, to reach the risk for balancing each period cracking, to the long-term safety of building
Property, especially there is sensitive the closely knit of building, cracking resistance, durability to crackle and brings more actual use.
In order to test the concrete of the present invention characteristic of closely knit antimitotic agent, present invention employs following testing experiment sides
Method.
Concrete flat slab cracking comparative test
Test material:
Concrete confined shrinkage split test uses the frame of mold for the stainless steel plate of thickness 5mm, and inner edge is having a size of 600mm
The steel die of × 600mm × 50mm is set in frameThe double screw of spacing 50mm, length are the peg of 100mm
Staggeredly it is spaced apart (as shown in Figure 1) up and down.
Test procedure:
One layer of oil is smeared on bottom plate when test in the range of frame surrounds, prevents test specimen moisture from bottom surface evaporation loss.
A desk fan is placed in the side away from mold short side 15cm, fan blade center is parallel with surface of test piece, and the wind speed of concrete surface is
4.0~5.0m/s, 1000w iodine-tungsten lamp are located at the top 1.2m of test specimen cross central line, and at template long side 15cm, continuous dry is shone
4h is closed.
When test, environment temperature control is 60 ± 5% in 20 DEG C ± 3 DEG C, relative humidity, first pours into concrete mix
Molding is plugged and pounded in this mold, test specimen is respectively placed in the environment of wind lamp photograph by smooth out surface with mould, wide with special measurement crack
The fracture width detector of degree carries out tracking observation to the cracking situation of each concrete slab.
Start every 5min observation once, becomes every 10min observation when discovery has crackle generation once, shone in wind lamp
Under conditions of, test specimen is observed for 24 hours.After the test, the initial cracking time in crack (is opened on each concrete slab of essential record
Begin the time for crack occur), flaw size (maximum crack width and longest fracture length when for 24 hours).Fracture length cotton yarn
Line moves towards to obtain corresponding length along crack, and it is visible that fracture length is subject to naked eyes, its value L is measured with steel tape, with mm
Meter；The width d in crack is measured with the fracture width detector of special measurement fracture width, and the crack near fracture length midpoint is wide
Degree represents the maximum crack in the crack.And the crack occurrence gross area is calculated as follows:
Acr=Σ Aimax*Li
Acr in formula -- the test specimen crack name gross area (mm2)；
Aimax-- the i-th crack name maximum crack width (mm)；
Li-- the i-th crack length (mm).
The performance of concrete early-age plastic shrinkage is finally evaluated with the size of the crack occurrence gross area.
Blank group (not mixing swelling agent), comparative example (commercially available swelling agent, such as common II type swelling agent) and embodiment
1, embodiment 2,3 concrete compaction antimitotic agent of embodiment concrete flat slab cracking comparing result see below shown in list.
It can be seen that obviously prolonging mixed with the concrete cracking time after embodiment concrete compaction antimitotic agent in the present invention
Long, flaw area is significantly reduced.
Embodiment
The present invention is described in more detail below with reference to specific embodiment, however following embodiment is only limitted to this
The understanding of invention, the present invention are not limited in range given by embodiment.Herein, when not specializing, all hundred
Ratio is divided to be weight percentage.
Embodiment 1
Concrete compaction antimitotic agent component (by weight) includes: light calcined magnesia 30%, calcium oxide-sulphur in the present embodiment
The double expansion sources expansive clinkers 30% of calcium aluminate class, gypsum (natural anhydrite that purity is 85%) 15%, specific surface area are
500m2The mountain flour 30% of/kg.
Wherein, light calcined magnesia, double expansion sources expansive clinkers can be prepared with the following method: light calcined magnesia is
60 minutes obtained active reaction time is calcined as 100 seconds at 850 DEG C using 100% magnesite (average grain diameter 10-30mm)
Light calcined magnesia, the double expansion sources expansive clinkers of calcium oxide-calcium sulphoaluminate class are by by lime stone, iron powder, gypsum and aluminium alum
Calcining obtains soil at 1300 DEG C in rotary kiln, and group becomes SiO23.83%, Al2O36.65%, Fe2O31.80%, CaO
75.8%, MgO 1.57%, SO38.81%, wherein f-CaO 55.5%.
Embodiment 2
Concrete compaction antimitotic agent component (by weight) includes: light calcined magnesia 40%, calcium oxide-sulphur in the present embodiment
The double expansion sources expansive clinkers 20% of calcium aluminate class, gypsum (natural anhydrite that purity is 85%) 15%, (specific surface area is mountain flour
500m2The agstone of/kg) 25%.
Wherein, light calcined magnesia is the light-burned oxidation that magnesite is 100 seconds in the active reaction time that 850 DEG C of calcinings obtain
Magnesium, the double expansion sources expansive clinkers of calcium oxide-calcium sulphoaluminate class are by turning round lime stone, iron powder, gypsum and bauxite
Calcining obtains (composition is with embodiment 1) at 1300 DEG C in kiln.
Embodiment 3
Concrete compaction antimitotic agent component (by weight) includes: light calcined magnesia 55%, calcium oxide-sulphur in the present embodiment
The double expansion sources expansive clinkers 15% of calcium aluminate class, gypsum (natural anhydrite that purity is 85%) 10%, (specific surface area is mountain flour
500m2The agstone of/kg) 20%.
Wherein, magnesia is the light calcined magnesia that magnesite is 100 seconds in the active reaction time that 850 DEG C of calcinings obtain,
The double expansion sources expansive clinkers of calcium oxide-calcium sulphoaluminate class be by by lime stone, iron powder, gypsum and bauxite in rotary kiln
Calcining obtains (composition is with embodiment 1) at 1300 DEG C.
The concrete formulation of antimitotic agent for testing example 1,2,3 is using common side wall formula, i.e. concrete grade
For C35, glue material total amount 380kg/m3, water-cement ratio 0.43, the polycarboxylate water-reducer that incorporation solid content is 10%, volume 1.3%,
Concrete compaction antimitotic agent is 35kg/m in the volume of concrete3(replacing doping quantity of fly ash), adding manner are and gelling material
Material, coarse-fine aggregate first carry out mix, add water, duration of mixing can slightly extend 30 seconds.
According to GB/T 50081-2002 " standard for test methods of mechanical properties of ordinary concrete " molding compression strength and anti-folding
Intensity forms limited expansion rate test specimen according to GB23439 " cement expansive material ", according to GB/T 50082-2009 " common coagulation
Native long-term behaviour and endurance quality test method standard " molding impervious test piece, in concrete formation can by plain bumper or
It manually plugs and pounds and carries out the molding of die trial, receives light, be put into standard curing room (20 DEG C of temperature, relative humidity 95%) condition after demoulding
Under conserved.
The concrete of the concrete compaction antimitotic agent of embodiment is added, can effectively improve concrete density, effectively
Compensating concrete shrinks, improves seepage-resistant grade, working performance of concrete, limited expansion rate, compression strength, flexural strength and anti-
It is as follows to seep experimental result:
1 working performance of concrete of table
The incorporation closely knit antimitotic agent of high-performance will not only adversely affect working performance of concrete as can be seen from Table 1,
It being acted on by the effect of each component, such as fine powder material, working performance of concrete has certain improvement, and divergence significantly increases,
And later-slump loss is relatively small, concrete pumpability is good.In addition concrete molding temperature illustrates this there are also faint decline
Product can't improve hydration heat of concrete, will not improve inside concrete temperature rise.
2 concrete limited expansion rate of table
As can be seen from Table 2, when concrete expansion effect early period for mixing concrete compaction antimitotic agent of the present invention is obvious, after
Phase is also smaller than blank since the microdilatancy of light calcined magnesia acts on its drying shrinkage drop, can with the contraction in compensating concrete each stage,
It effectively prevent concrete cracking.Wherein 1 early period of embodiment, expansion was larger, and the middle and later periods shrinks larger, embodiment 3 early period of expansion phase pair
Smaller, the middle and later periods shrinks also smaller, the expansion drop minimum of concrete, main reason is that light calcined magnesia and calcium oxide-sulphur
The content of the double expansion sources expansive clinkers of calcium aluminate class is adjusted, i.e. light calcined magnesia content is bigger, and the concrete middle and later periods shrinks
Smaller, calcium oxide-more big then concrete early expansion of the double expansion sources clinker contents of calcium sulphoaluminate class is higher, and the middle and later periods shrinks
It increases with it, wherein concrete expansion drop is larger.It therefore can be according to concrete structure feature, use environment and concrete
Proportion etc. selects the proportion of concrete compaction antimitotic agent, and if concrete is thin-wall construction, main shrinkage is the concrete middle and later periods
It is dry to shrink, cracking resistance agent prescription in preferable embodiment 3.
3 concrete strength of table
4 concrete strength of table
After the incorporation closely knit antimitotic agent of high-performance known to table 3 and table 4, compression strength is essentially identical with blank, i.e. this product
It has no adverse effect to concrete crushing strength；Flexural strength has a certain upgrade compared with blank.Long-term strength of concrete is without retraction, by force
Development stability is spent, concrete strength is whole more excellent compared with blank, and bend-press ratio is increased, and can reflect concrete anticracking from side
Performance increases.
It is swollen that the double expansion sources of the component in antimitotic agent composition, especially light calcined magnesia, calcium oxide-calcium sulphoaluminate can be adjusted
Bend-press ratio, the expansion character of the amount of swollen clinker, balance and adjusting concrete.
The concrete impervious result of table 5
| Project | Blank | Embodiment 1 | Embodiment 2 | Embodiment 3 |
| Seepage-resistant grade | P8 | P10 | P10 | P10 |
As shown in Table 4, after mixing this concrete compaction antimitotic agent, according to GB/T 50082-2009, " normal concrete is long-term
Performance and endurance quality test method standard " in concrete impervious level estimate method test, concrete impervious grade mentions by P8
It is raised to P10, i.e. concrete impermeability can be improved in concrete compaction antimitotic agent.It is not limited to theory, it is believed that be primarily due to
After mixing antimitotic agent of the present invention, the density of concrete is improved, to be conducive to the anti-permeability performance of concrete.It is resistance to concrete
Long performance has certain improvement result.
To this antimitotic agent and meet the progress temperature simulation of II type swelling agent specified in GB23439 " cement expansive material "
Comparative test continuously monitors concrete strain using concrete length automatic monitor, concrete masking foil into
For row package to simulate half waterproof state of building site, temperature simulation curve is shown in that Fig. 2, strain curve are shown in Fig. 3.
From Fig. 3 this it appears that concrete is under the conditions of half waterproof, concrete compaction antimitotic agent of the present invention is in summer temperature
It spends analog case lower early period and is in certain expansion, can be received so that the contraction of effective compensation concrete autogenous volume early period and early period are dry
Contracting, and later period strain has a small amount of contraction under the contraction of concrete itself temperature drop and dry contraction, but concrete is still within
Microdilatancy state, later period contraction is basicly stable, and overall process is coordinated compensating concrete and shunk, and concrete cracking can be effectively prevented.
And though II type swelling agent has certain expansion an early period, the later period shrinks larger, and there are cracking risks.
6 concrete flat slab of table cracking comparing result
Note: II type swelling agent is GB23439II type swelling agent
Engineering example 1
Film studio engineering provides concrete compaction antimitotic agent.Analysis to the film studio are as follows: 1, film studio be framed wall
Structure, thickness of wall body 200mm, plane length 42m × 48m, film studio are one layer, high 22.45m, are the ultra-thin knot of typical overlength
Structure；2, film studio requires the integrality and engineering soundproof effect of structure, requires free from flaw and cancel the late poured band to subtract concrete
Few construction joint；3, wall belongs to overlength superthin structure, and belongs to superstructure, under execution conditions in June, round the clock temperature 10~12
DEG C, the later period, dry contraction was larger, and concrete cracking risk is high.
For the analysis in the film studio, selection uses the closely knit antimitotic agent of embodiment 3.Strict control concreting
Journey, regular sprinkling maintenance after wall demoulding.
Do not occur any crack after the wall one-piece casting of perimeter 180m；Inbuilt strain gauge also shows wall in wall
It is constantly in microdilatancy state.
According to examples detailed above, concrete compaction antimitotic agent provided by the present invention can coordinate compensating concrete each stage
It shrinks, improve working performance of concrete and improves concrete density, carry out improving crack-resistant performance of concrete and endurance quality.
Claims (13)
1. a kind of concrete compaction antimitotic agent, comprising:
The light calcined magnesia of 20.0-60.0%；
The double expansion sources expansive clinkers of the calcium oxide of 10.0%-30.0%-calcium sulphoaluminate class；
The gypsum of 5.0-15.0%；
The average specific surface area of 20.0-50.0% is greater than 300m2The fine powder material of/kg；
The summation of the constituent content is 100%, in terms of the gross mass of antimitotic agent.
2. antimitotic agent according to claim 1, wherein the light calcined magnesia be by selected from including magnesite, dolomite,
The magnesium-containing ore of serpentine calcined at 800-1100 DEG C be made, wherein calcining after light calcined magnesia content be 90% weight with
On.
3. antimitotic agent according to claim 1, wherein the light calcined magnesia active reaction time is more than or equal to 50 seconds
To less than 300 seconds, the homogeneity of the MgO activity controlled within ± 20 seconds.
4. antimitotic agent according to claim 1, wherein the light calcined magnesia active reaction time is more than or equal to 50 seconds
To less than 200 seconds, or be more than or equal to 200 seconds to less than 300 seconds, the control of the homogeneity of the MgO activity ± 20 seconds with
It is interior.
5. antimitotic agent according to claim 3 or 4, wherein the homogeneity control of the MgO activity ± 10 seconds with
It is interior.
6. antimitotic agent according to claim 1, wherein double expansion sources expansive clinkers are by lime stone, iron powder, gypsum
And bauxite is made in 1250 DEG C of -1400 DEG C of calcinings, comprising: 3.03%~4.27% SiO2；6.05%~6.90%
Al2O3；1.20%~2.03% Fe2O3；72.8%~78.5% CaO；1.37%~1.72% MgO；6.81%~
10.72% SO3；Wherein the content of f-CaO is 53.5%~58.8%；Wherein said components are with the calcium oxide-sulphur aluminic acid
The dry weight total amount of the double expansion sources expansive clinkers of calcium class is 100%.
7. antimitotic agent according to claim 1, wherein the gypsum is the gypsum that purity is 70% or more.
8. antimitotic agent according to claim 1, wherein it includes following one kind or combination that the gypsum, which is selected from: fluorgypsum,
Ardealite, desulfurized gypsum, dihydrate gypsum or anhydrite.
9. antimitotic agent according to claim 1, wherein the fine powder material is that specific surface area is greater than 500m2The mountain flour of/kg, mine
Powder, fiber or other fillers that can be used in concrete.
10. antimitotic agent according to claim 8, wherein gypsum includes, by weight, CaO36.1%~40.8%,
SO350.6%~59.6%.
11. antimitotic agent according to claim 1 mixes the graininess wherein the antimitotic agent is granular mixture
It is the 10% or less of total weight that the square hole screen that the fineness requirement of object is 0.08mm, which tails over,.
12. antimitotic agent according to claim 1 mixes the graininess wherein the antimitotic agent is granular mixture
It is the 5% or less of total weight that the square hole screen that the fineness requirement of object is 0.08mm, which tails over,.
13. antimitotic agent according to claim 1 mixes the graininess wherein the antimitotic agent is granular mixture
It is the 3% or less of total weight that the square hole screen that the fineness requirement of object is 0.08mm, which tails over,.
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| CN110498632A (en) * | 2019-08-23 | 2019-11-26 | 广西筑盟建材有限公司 | Five expansion sources ultra-high performance concrete swelling agents |
| CN110734245A (en) * | 2019-10-29 | 2020-01-31 | 武汉三源特种建材有限责任公司 | Hydration heat inhibition type concrete anti-cracking waterproof agent, preparation method and application thereof |
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| CN114855887A (en) * | 2022-05-27 | 2022-08-05 | 中铁第四勘察设计院集团有限公司 | Waterproof structure of station underground structure and construction method thereof |
| CN115043610B (en) * | 2022-07-05 | 2023-03-10 | 中铁三局集团第四工程有限公司 | Concrete anti-cracking agent, anti-cracking concrete and preparation method thereof |
| CN115636613B (en) * | 2022-10-20 | 2023-07-28 | 江苏中建商品混凝土有限公司 | Additive for improving carbonization resistance of concrete and application thereof |
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