CN104529319A - Low-heat micro-expansion composite cement and preparation method thereof - Google Patents
Low-heat micro-expansion composite cement and preparation method thereof Download PDFInfo
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- 239000004568 cement Substances 0.000 title claims abstract description 107
- 238000002360 preparation method Methods 0.000 title claims abstract description 15
- 239000002131 composite material Substances 0.000 title abstract 7
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims abstract description 101
- 239000000395 magnesium oxide Substances 0.000 claims abstract description 64
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 41
- 238000000034 method Methods 0.000 claims abstract description 28
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 claims abstract description 26
- 238000000227 grinding Methods 0.000 claims abstract description 24
- 239000011405 expansive cement Substances 0.000 claims abstract description 18
- 239000010440 gypsum Substances 0.000 claims abstract description 18
- 229910052602 gypsum Inorganic materials 0.000 claims abstract description 18
- 239000002893 slag Substances 0.000 claims description 25
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 claims description 24
- 230000000694 effects Effects 0.000 claims description 22
- 238000012360 testing method Methods 0.000 claims description 15
- 239000011777 magnesium Substances 0.000 claims description 10
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims description 9
- 229910052749 magnesium Inorganic materials 0.000 claims description 9
- 239000010881 fly ash Substances 0.000 claims description 8
- 239000004615 ingredient Substances 0.000 claims description 3
- 239000002075 main ingredient Substances 0.000 claims description 2
- 229910052757 nitrogen Inorganic materials 0.000 claims description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N nitrogen Substances N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 2
- 238000001179 sorption measurement Methods 0.000 claims description 2
- 239000004567 concrete Substances 0.000 abstract description 43
- 238000002156 mixing Methods 0.000 abstract description 9
- 239000011398 Portland cement Substances 0.000 abstract description 4
- 239000002440 industrial waste Substances 0.000 abstract description 4
- 230000008961 swelling Effects 0.000 description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 12
- 230000036571 hydration Effects 0.000 description 11
- 238000006703 hydration reaction Methods 0.000 description 11
- 239000000203 mixture Substances 0.000 description 11
- 230000008569 process Effects 0.000 description 10
- 238000005336 cracking Methods 0.000 description 9
- 239000002002 slurry Substances 0.000 description 9
- 230000008602 contraction Effects 0.000 description 7
- 239000000463 material Substances 0.000 description 5
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 4
- 239000011575 calcium Substances 0.000 description 4
- 229910052791 calcium Inorganic materials 0.000 description 4
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 4
- 230000006835 compression Effects 0.000 description 4
- 238000007906 compression Methods 0.000 description 4
- 238000010276 construction Methods 0.000 description 4
- 229910001653 ettringite Inorganic materials 0.000 description 4
- 238000012423 maintenance Methods 0.000 description 4
- 239000003469 silicate cement Substances 0.000 description 4
- 239000000292 calcium oxide Substances 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 150000001875 compounds Chemical class 0.000 description 3
- 238000001035 drying Methods 0.000 description 3
- 238000007493 shaping process Methods 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 2
- 239000011083 cement mortar Substances 0.000 description 2
- 230000018044 dehydration Effects 0.000 description 2
- 238000006297 dehydration reaction Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000011440 grout Substances 0.000 description 2
- 238000009440 infrastructure construction Methods 0.000 description 2
- 229910052500 inorganic mineral Inorganic materials 0.000 description 2
- 230000001418 larval effect Effects 0.000 description 2
- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical compound [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 description 2
- 239000000347 magnesium hydroxide Substances 0.000 description 2
- 229910001862 magnesium hydroxide Inorganic materials 0.000 description 2
- 239000011707 mineral Substances 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 208000034189 Sclerosis Diseases 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000002742 anti-folding effect Effects 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 239000002956 ash Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 239000004574 high-performance concrete Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000004570 mortar (masonry) Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- CCEKAJIANROZEO-UHFFFAOYSA-N sulfluramid Chemical group CCNS(=O)(=O)C(F)(F)C(F)(F)C(F)(F)C(F)(F)C(F)(F)C(F)(F)C(F)(F)C(F)(F)F CCEKAJIANROZEO-UHFFFAOYSA-N 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 230000003245 working effect Effects 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Landscapes
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention relates to a low-heat micro-expansion composite cement and a preparation method thereof. The composite cement comprises the following components: 1-8 parts of a magnesium oxide expanding agent, 25-70 parts of industrial waste residue, 25-70 parts of portland cement clinker, and 1-4 parts of gypsum. The preparation method includes: mixing and grinding the magnesium oxide expanding agent, the portland cement clinker and the gypsum to prepare magnesium oxide expansive cement with a specific surface area of not lower than 300m<2>/kg, then mixing the magnesium oxide expansive cement with the industrial waste residue evenly according to the ratio to prepare composite cement; or burdening and mixing the magnesium oxide expanding agent, the cement clinker, the gypsum and the industrial waste residue in proportion, and carrying out grinding together to obtain composite cement. The composite cement prepared by the method has fineness of 80-micrometer square hole screen residue of less than 10%, and a specific surface area of not less than 300m<2>/kg. The composite cement provided by the invention can generate expansion in the early stage, also can generate expansion in the middle and late stage, simultaneously satisfies compensation of concrete shrinkage in the early stage and the middle and late stage, and prevents shrinkage crack of concrete.
Description
Technical field
The invention belongs to building material technical field, be specifically related to a kind of low-heat, microdilatancy complex cement and preparation method thereof.
Background technology
Concrete is a kind of most popular material of construction.Concrete to produce in the process of intensity in sclerosis can because the reason such as to scatter and disappear of hydrated cementitious or moisture outwardly environment produces various contraction, as self-constriction, dry shrinkage, temperature drop contraction etc.Under constraint condition, shrink and will produce tensile stress, concrete material will be caused to ftracture when tensile stress exceedes the ultimate tensile of concrete material, thus affect work-ing life and the safety of concrete building structures.Along with the development of China's economic society, the demand of infrastructure construction continues to increase, large quantities of great infrastructure construction engineering as water resources dam, bridge, tunnel, high-speed railway etc. or build.Need in these Important Project to use a large amount of mass concretes.Temperature drop shrinks and causes the cracking of concrete material to be the common problem that mass concrete faces, the weather resistance of serious harm concrete structure and security.Prevent mass concrete in Important Project from shrinking because of temperature drop the cracking caused, guarantee that engineering safety is the great demand of nation-building.
For preventing the cracking of mass concrete, people often take to cool concrete raw material, on the rocksly mix and stir, bury traditional temperature control measures such as water-cooled tube underground, to reduce mass concrete temperature rise, reduce temperature drop and shrink.The anticracking of these measures to mass concrete has active effect, but costly, affects construction speed, and often can not avoid concrete cracking completely.Also research is had to use high content mineral admixtures such as flyash etc. to reduce cement consumption to reduce the aquation temperature rise of mass concrete.But, mix a large amount of mineral admixture and obviously reduce concrete early strength.
In concrete, mix appropriate swelling agent, the contraction of the expansion compensation concrete material utilizing swelling agent aquation to produce is one of common technology means preventing Shrinkage Cracking of Concrete, and this technological operation is simple, advantage of lower cost, effective.At present, the swelling agent on market mainly contains three classes, i.e. calcium sulphoaluminate class, calcium sulphoaluminate-calcium oxide and calcium oxide.Containing the swelling agent of calcium sulphoaluminate class with ettringite (3CaOAl
2o
33CaSO
432H
2o) as expansion sources, namely swelling agent forms ettringite and produces expansion in hydration process.This type of swelling agent hydration swelling is very fast, main generation in early days of expanding, and the later stage temperature drop contraction of the contraction to later concrete, particularly mass concrete but can not effective compensation.Ettringite easily decomposes dehydration in high temperature (as being greater than 80 DEG C) environment, therefore must not be used for containing the swelling agent of calcium sulphoaluminate class the engineering that long term ambient temperature is more than 80 DEG C, thus limit its application in the mass concrete of temperature rise higher than 80 DEG C.In addition, because the formation of ettringite needs large water gaging, this type of swelling agent is also affected at the lower modern high performance concrete of water cement ratio and the expansion effect be difficult to carry out in wet-cured concrete.Calcium oxide (CaO) is also conventional makees swelling agent, and its aquation generates calcium hydroxide (Ca (OH)
2) time produce volumetric expansion.Calcium oxide expansion agents expands rapidly, and expanding, it is early stage mainly to result from, thus to the shrinkage-compensating DeGrain of later concrete.
The MgO prepared under specified conditions produces early in hydration process-in-later stage prolonged expansion, the temperature drop that can be used for compensating mass concrete shrinks, the problem of Cracking of better solution mass concrete, and can simplify or cancel temperature control measures, save construction investment, accelerating construction progress, economic results in society are huge.Magnesium oxide (MgO) aquation generates magnesium hydroxide (Mg (OH)
2) time produce volumetric expansion, this swelling agent hydration swelling water requirement is few, can use in the concrete of low water-cement ratio or wet curing deficiency.In addition, the dehydration temperaturre of magnesium hydroxide is high (being about 340 DEG C-490 DEG C), can be used in mass concrete, and the temperature drop of compensating concrete shrinks.The eighties in last century, develop the high-magnesia cement for water conservancy project dam concrete, the free magnesium contained in cement clinker, due to clinker burning temperatures as high 1450 DEG C, magnesian hydration activity is low, reaction is very slow, expands and mainly concentrates on the later stage, and thus shrinking later stage temperature drop has obvious compensating action.But for the relatively little mass concrete of scale, its temperature drop shrinks and occurs relatively early, because magnesium oxide can not carry out effective compensation in cement clinker, particularly for occurring in for early stage self-constriction, compensation effect is poorer.On the other hand, due to the problem of soundness of cement, in cement clinker, magnesian content can not be greater than 5%, thus often occurs that content of magnesia is inadequate, and expansion can not be shunk in full remuneration.Research and development afterwards have the magnesium oxide of different hydration activity, and are used as to mix swelling agent outward and use, and its consumption and expansion character can better control, but its dispersing uniformity in concrete is comparatively difficult to ensure card, and add churning time.
Summary of the invention
The technical problem solved: the invention provides a kind of low-heat micro-expansion complex cement and preparation method thereof, it can produce expansion in early days, can produce in the middle and later periods again and expand, meet that compensating concrete is early stage, the contraction of middle and later periods simultaneously, prevent concrete shrinkage cracking.Simultaneously in conjunction with a large amount of industrial residue, reduce the consumption of cement clinker, reduce CO
2discharge, improves early strength.
Technical scheme: a kind of preparation method of low-heat micro-expansion complex cement, following component is prepared burden by (1) by weight: MgO expansion agent: 1-8 part, industrial residue: 25-70 part, Portland clinker 25-70 part, gypsum 1-4 part; (2) MgO expansion agent, Portland clinker and gypsum combined grinding in batching are prepared magnesium oxide expansive cement, cement specific surface area is not less than 300m
2/ kg, then by this magnesium oxide expansive cement and industrial residue according to proportioning, mix, be mixed with complex cement; Or by MgO expansion agent, cement clinker, gypsum and industrial residue according to proportion ingredient, intergrinding, prepares complex cement, complex cement fineness prepared by the method is that 80 microns of square hole sieves tail over and are less than 10%, and specific surface area is not less than 300m
2/ kg.
Described MgO expansion agent is main ingredient with periclasite, and content of magnesia is not less than 60wt%, and the specific surface area that BET-nitrogen adsorption method records is 5-80m
2/ kg, adopts citric acid method test activity index to be 30s-600s.
Described industrial residue is made up of at least two kinds in flyash, slag, slag, magnesium slag.
The industrial residue of described substep grinding, wherein the specific surface area of grinding granulated blast-furnace slag, slag and magnesium slag is not less than 400m
2/ kg.
The low-heat micro-expansion complex cement of above-mentioned preparation method's gained.
The concrete contraction of the expansion compensation that the present invention utilizes magnesium oxide aquation to produce.Adopt industrial residue to replace part of cement, reduce cement consumption, thus reduce hydrated cementitious heat release, reduce the self-constriction because hydrated cementitious produces.By separate grinding magnesium oxide micro-expansion cement and industrial residue, more easily can control the fineness of cement and industrial residue respectively, optimize cement and waste particle grating, improve the hydration efficiency of cement, be conducive to improving early stage hydrated cementitious speed, improve early strength.Mix industrial residue simultaneously, the volcano ash effect of industrial residue can be given full play to, improve complex cement later strength.In addition, this low-heat micro-expansion complex cement can also by preparing Portland clinker, MgO expansion agent, gypsum and industrial residue to certain fineness according to proportion ingredient, again intergrinding.The method of this intergrinding can not control separately cement granules and industrial residue particle fineness, can only control the fineness of the finished product microdilatancy complex cement on the whole, may increase grinding energy.
In such scheme, according to actual needs, the MgO expansion agent of different activities, different amount can be mixed, regulates and controls cement and expanded speed and swell increment, meet the demand that compensating concrete shrinks.Select active high MgO expansion agent, more expansion can be produced in early days, and select active lower MgO expansion agent, then can produce in the middle and later periods and expand more.By the change to component proportions such as industrial residue, MgO expansion agent and cement clinkers, the complex cement with different mechanical properties and cubic deformation performance can be prepared.
Beneficial effect: the invention provides a kind of low-heat micro-expansion complex cement and preparation method thereof is the approach preventing Shrinkage Cracking of Concrete from providing new.The expansion character of this complex cement can conveniently regulating and controlling, namely can produce rapid, appropriate expansion compensation concrete early-age shrinkage in early days, can produce the appropriate expansion compensation concrete middle and later periods again and shrink, prevent concrete shrinkage cracking in the middle and later periods.In addition, in this complex cement, cement clinker consumption is few, and industrial residue consumption is large, and hydration heat is low, CO
2discharge is few, and early stage mechanical strength develops fast advantage.
Accompanying drawing explanation
Fig. 1 is the process flow sheet of low-heat non-shrinkage cement of the present invention substep grinding.First the MgO expansion agent of cement clinker, different activities and gypsum are prepared burden, then by said mixture intergrinding to specifying fineness, obtained magnesium oxide expansive cement.Separate grinding industrial residue, then, prepares burden magnesium oxide expansive cement and levigate industrial residue, and mixing, is mixed with complex cement.
Fig. 2 is the process flow sheet of the common mixed grinding of low-heat non-shrinkage cement of the present invention.Cement clinker, MgO expansion agent, gypsum and various industrial residue are carried out prepare burden, intergrinding to regulation fineness, make complex cement.
Fig. 3 is the heat flux measuring result figure preparing complex cement in embodiment 1 and embodiment 2;
Fig. 4 is the hydration heat measuring result figure preparing complex cement in embodiment 1 and embodiment 2;
Fig. 5 is embodiment 1, embodiment 2 and embodiment 3 prepare complex cement, adopts the Early self-shrinkage graphic representation that ripple tube method is measured;
Fig. 6 is embodiment 2 and embodiment 3 complex cement grout deformation curve.
Fig. 7 is embodiment 1, embodiment 3 and embodiment 6 compound cement body drying shrinkage deformation curve.
Embodiment
Following examples further illustrate content of the present invention, but should not be construed as limitation of the present invention.Without departing from the spirit and substance of the case in the present invention, the amendment do the inventive method, step or condition and replacement, all belong to scope of the present invention.If do not specialize, the conventional means that technique means used in embodiment is well known to those skilled in the art.
Embodiment 1:
Adopt the technical process shown in Fig. 1, by 53.1 parts of Portland clinkers, (test activity index according to citric acid method is 50s to 4.25 parts of MgO expansion agents, and content of magnesia is 87wt%, and specific surface area is 25m
2/ kg.) and 2.65 parts of gypsum grinding in ball mill, prepare magnesium oxide expansive cement, cement specific surface area is greater than 400m
2/ kg.With the magnesium oxide expansive cement prepared and 20 parts of slags, (separate grinding is greater than 450m to specific surface area again
2/ kg), the mixing of 20 parts of flyash, prepare complex cement.
Embodiment 2:
Adopt the technical process shown in Fig. 1, by 35.4 parts of Portland clinkers, (test activity index according to citric acid method is 50s to 2.8 parts of MgO expansion agents, and content of magnesia is 87wt%, and specific surface area is 25m
2/ kg.) and 1.8 parts of gypsum grinding in ball mill, prepare magnesium oxide expansive cement, cement specific surface area is greater than 400m
2/ kg.With the magnesium oxide expansive cement prepared and 40 parts of slags, (separate grinding is greater than 450m to specific surface area again
2/ kg), the mixing of 20 parts of flyash, prepare complex cement.
Embodiment 3:
Adopt the technical process shown in Fig. 1, by 35.4 parts of Portland clinkers, (test activity index according to citric acid method is 400s to 2.8 parts of MgO expansion agents, and content of magnesia is 89wt%, and specific surface area is 7.2m
2/ kg.) and 1.8 parts of gypsum grinding in ball mill, prepare magnesium oxide expansive cement, cement specific surface area is greater than 400m
2/ kg.With the magnesium oxide expansive cement prepared and 40 parts of slags, (separate grinding is greater than 450m to specific surface area again
2/ kg), the mixing of 20 parts of flyash, prepare complex cement.
Embodiment 4:
Adopt the technical process shown in Fig. 1, by 53.1 parts of Portland clinkers, (test activity index according to citric acid method is 50s to 4.2 parts of MgO expansion agents, and content of magnesia is 87wt%, and specific surface area is 25m
2/ kg.) and 2.7 parts of gypsum grinding in ball mill, prepare magnesium oxide expansive cement, cement specific surface area is greater than 460m
2/ kg.Mix with 20 parts of slags, 10 parts of magnesium slags, 10 parts of slags with the magnesium oxide expansive cement prepared again, prepare complex cement.Slag, magnesium slag and slag are all greater than 450m through separate grinding to specific surface area
2/ kg.
Embodiment 5:
Adopt the technical process shown in Fig. 2, by 40 parts of Portland clinkers, (test activity index according to citric acid method is 50s to 2 parts of MgO expansion agents, and content of magnesia is 87wt%, and specific surface area is 25m
2/ kg.), 2 parts of gypsum, 40 parts of magnesium slags, 16 parts of slags grindings in ball mill, prepare complex cement, complex cement fineness is that 80 microns of square hole sieves tail over and are less than 5%, and specific surface area is greater than 460m
2/ kg.
Embodiment 6:
Adopt the technical process shown in Fig. 1, by 34.1 parts of Portland clinkers, (test activity index according to citric acid method is 83s to 4.1 parts of MgO expansion agents, and content of magnesia is 65wt%, and specific surface area is 14m
2/ kg.) and 1.8 parts of gypsum grinding in ball mill, prepare magnesium oxide expansive cement, cement specific surface area is greater than 400m
2/ kg.With the magnesium oxide expansive cement prepared and 40 parts of slags, (separate grinding is greater than 450m to specific surface area again
2/ kg), the mixing of 20 parts of flyash, prepare complex cement.
Fig. 3, Fig. 4 are the hydration heat measuring result preparing complex cement in embodiment 1 and embodiment 2.As seen from the figure, compared with silicate cement, mix slag and flyash, substantially reduce hydrated cementitious rate of heat release and reduce hydration heat amount.
Fig. 5 is that embodiment 2 and embodiment 3 prepare complex cement, and adopt the Early self-shrinkage curve that ripple tube method (outside diameter of bel is of a size of 28.5mm, and length is 440mm) is measured, water cement ratio is 0.38, measures and calculates from cement slurry initial set.As seen from the figure, compared with ordinary Portland cement, the early stage self-constriction of complex cement is significantly less than silicate cement, particularly when mixing the complex cement that activity index is 50s MgO expansion agent, its self-constriction is in early days compensated completely, also creates the microdilatancy of 200 microstrains when the length of time is 110h.Compared with silicate cement, mix the complex cement (embodiment 3) that activity index is the MgO expansion agent of 400s, self-constriction obviously reduces, and still has the self-constriction of 230 microstrains during 110h.Visible, MgO expansion agent activity higher (activity index is less), early stage compensation effect is more obvious.
By embodiment 2 and embodiment 3 complex cement, (water cement ratio the is 0.38) mix that adds water becomes the cement slurry of 20mm × 20mm × 80mm, relative humidity be 98 ± 2%, temperature is maintenance 24 hours in 20 ± 2 DEG C of maintaining boxes, the demoulding, survey just long, then be placed on maintenance in 20 DEG C of water, measure the length of different larval instar slurry test specimen, calculate deflection.Fig. 6 is two kinds of complex cement grout deformation curves.As seen from the figure, complex cement all creates expansion, and the ratio of expansion embodiment 2 complex cement slurry that embodiment 3 complex cement slurry produces is large.This is that in embodiment 3, the activity of MgO expansion agent is lower due to compared with embodiment 2, and more polyoxygenated magnesium also measures just long (shaping 24 hours) aquation generation expansion afterwards in the demoulding.
By embodiment 1, embodiment 3 and embodiment 6 complex cement, add water (water cement ratio is 0.38) mix, the cement slurry of shaping preparation 20mm × 20mm × 80mm, be 98 ± 2% in relative humidity, temperature is maintenance 24 hours in 20 ± 2 DEG C of maintaining boxes, the demoulding, survey just long, then test specimen is placed on 25 ± 2 DEG C, relative humidity is maintenance in the climatic chamber of 60 ± 5%, measure the length of different larval instar slurry test specimen, calculate deflection.Fig. 7 is embodiment 1, embodiment 3 and embodiment 6 compound cement body drying shrinkage deformation curve.As seen from the figure, compared with Portland cement paste, the dry shrinkage amount of embodiment 1, embodiment 3 and embodiment 6 complex cement slurry significantly reduces, and particularly the drying shrinkage value of embodiment 1 complex cement slurry 168 days time is close to zero.This mainly produces owing to MgO expansion agent reaction and expands, and compensate for the dry shrinkage of test specimen, meanwhile, in complex cement, various industrial waste residues instead of cement clinker, decreases cement consumption, also contributes to the dry shrinkage reducing test specimen.
To complex cement prepared by above each embodiment, with reference to cement mortar strength test standard, take a cement, three parts of standard sands and 0.5 part of water, stir, shaping 40mm × 40mm × 160mm mortar specimen, test compound cement is respectively in anti-folding, the ultimate compression strength of 3 days, 28 days and 90 days.Table 1 is the cement mortar strength test-results of above each embodiment complex cement.
Table 1
As can be seen from the table, the various embodiments described above complex cement 3 days ultimate compression strength is all more than or equal to 15MPa, and within 28 days, ultimate compression strength is all more than or equal to 40MPa.Wherein in embodiment 2, embodiment 3, embodiment 4 and embodiment 6 complex cement 28 days intensity higher than 28 days requirement of strength of 42.5 silicate cements.Particularly, 90 days time, the resistance to compression of each complex cement and folding strength have obvious increase, and this is mainly owing to the secondary pozzolanic reaction of industrial residue.
Claims (5)
1. a preparation method for low-heat micro-expansion complex cement, is characterized in that:
(1) following component is prepared burden by weight: MgO expansion agent: 1-8 part, industrial residue: 25-70 part, Portland clinker 25-70 part, gypsum 1-4 part;
(2) MgO expansion agent, Portland clinker and gypsum combined grinding in batching are prepared magnesium oxide expansive cement, cement specific surface area is not less than 300 m
2/ kg, then by this magnesium oxide expansive cement and industrial residue according to proportioning, mix, be mixed with complex cement; Or by MgO expansion agent, cement clinker, gypsum and industrial residue according to proportion ingredient, intergrinding, prepares complex cement, complex cement fineness prepared by the method is that 80 microns of square hole sieves tail over and are less than 10%, and specific surface area is not less than 300 m
2/ kg.
2. the preparation method of a kind of low-heat micro-expansion complex cement according to right 1, it is characterized in that described MgO expansion agent take periclasite as main ingredient, content of magnesia is not less than 60 wt%, and the specific surface area that BET-nitrogen adsorption method records is 5-80 m
2/ kg, adopts citric acid method test activity index to be 30s-600s.
3. the preparation method of a kind of low-heat micro-expansion complex cement according to right 1, is characterized in that described industrial residue is made up of at least two kinds in flyash, slag, slag, magnesium slag.
4. the preparation method of a kind of low-heat micro-expansion complex cement according to right 1, is characterized in that the industrial residue of described substep grinding, and wherein the specific surface area of grinding granulated blast-furnace slag, slag and magnesium slag is not less than 400 m
2/ kg.
5. the low-heat micro-expansion complex cement of any one of claim 1 ~ 4 preparation method gained.
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| CN104529319B CN104529319B (en) | 2017-04-05 |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105295876A (en) * | 2015-10-12 | 2016-02-03 | 嘉华特种水泥股份有限公司 | Slightly-expanded oil well cement |
| CN105781568A (en) * | 2016-03-21 | 2016-07-20 | 浙江温州沈海高速公路有限公司 | Shrinkage-compensating high-resistance tunnel structure |
| CN106946479A (en) * | 2017-04-06 | 2017-07-14 | 绵阳莫仕科技有限公司 | A kind of humble thermal expansion portland cement |
| CN109437637A (en) * | 2018-12-12 | 2019-03-08 | 盐城市国泰混凝土有限公司 | A kind of steel slag matter expansive agent for cement slurry and the portland-type cement for adulterating the swelling agent |
| CN109553320A (en) * | 2018-12-12 | 2019-04-02 | 盐城市国泰混凝土有限公司 | A kind of nickel slag expansive agent for cement slurry and the portland-type cement for adulterating the swelling agent |
| CN109665730A (en) * | 2018-12-19 | 2019-04-23 | 龚家玉 | A kind of anticracking cement and preparation method thereof |
| CN112608046A (en) * | 2020-11-21 | 2021-04-06 | 河北京兰水泥有限公司 | Coal-fired furnace slag composite mixed material and preparation method and application thereof |
| CN115259783A (en) * | 2022-06-28 | 2022-11-01 | 江苏苏博特新材料股份有限公司 | High-magnesium low-heat anti-cracking cement for hydraulic large-volume concrete and preparation method thereof |
| CN117003501A (en) * | 2023-05-09 | 2023-11-07 | 河北工业大学 | Ultralow-carbon magnesia slag cement and preparation method and application thereof |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105295876A (en) * | 2015-10-12 | 2016-02-03 | 嘉华特种水泥股份有限公司 | Slightly-expanded oil well cement |
| CN105295876B (en) * | 2015-10-12 | 2019-01-08 | 嘉华特种水泥股份有限公司 | A kind of microdilatancy oil-well cement |
| CN105781568A (en) * | 2016-03-21 | 2016-07-20 | 浙江温州沈海高速公路有限公司 | Shrinkage-compensating high-resistance tunnel structure |
| CN106946479A (en) * | 2017-04-06 | 2017-07-14 | 绵阳莫仕科技有限公司 | A kind of humble thermal expansion portland cement |
| CN109437637A (en) * | 2018-12-12 | 2019-03-08 | 盐城市国泰混凝土有限公司 | A kind of steel slag matter expansive agent for cement slurry and the portland-type cement for adulterating the swelling agent |
| CN109553320A (en) * | 2018-12-12 | 2019-04-02 | 盐城市国泰混凝土有限公司 | A kind of nickel slag expansive agent for cement slurry and the portland-type cement for adulterating the swelling agent |
| CN109437637B (en) * | 2018-12-12 | 2021-06-22 | 盐城市国泰混凝土有限公司 | Steel slag cement expanding agent and silicate cement doped with same |
| CN109553320B (en) * | 2018-12-12 | 2021-07-27 | 盐城市国泰混凝土有限公司 | Nickel slag cement expanding agent and silicate cement doped with same |
| CN109665730A (en) * | 2018-12-19 | 2019-04-23 | 龚家玉 | A kind of anticracking cement and preparation method thereof |
| CN112608046A (en) * | 2020-11-21 | 2021-04-06 | 河北京兰水泥有限公司 | Coal-fired furnace slag composite mixed material and preparation method and application thereof |
| CN115259783A (en) * | 2022-06-28 | 2022-11-01 | 江苏苏博特新材料股份有限公司 | High-magnesium low-heat anti-cracking cement for hydraulic large-volume concrete and preparation method thereof |
| CN117003501A (en) * | 2023-05-09 | 2023-11-07 | 河北工业大学 | Ultralow-carbon magnesia slag cement and preparation method and application thereof |
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