CN109133712A - A kind of additive and its application method improving alkali slag cement stone cracking and water suction - Google Patents

A kind of additive and its application method improving alkali slag cement stone cracking and water suction Download PDF

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Publication number
CN109133712A
CN109133712A CN201811168515.7A CN201811168515A CN109133712A CN 109133712 A CN109133712 A CN 109133712A CN 201811168515 A CN201811168515 A CN 201811168515A CN 109133712 A CN109133712 A CN 109133712A
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slag cement
additive
alkali
parts
test specimen
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CN109133712B (en
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杨长辉
李青
杨凯
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Chongqing University
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Chongqing University
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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
    • 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
    • C04B7/00—Hydraulic cements
    • C04B7/14—Cements containing slag
    • 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
    • C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
    • C04B2103/46—Water-loss or fluid-loss reducers, hygroscopic or hydrophilic agents, water retention agents
    • C04B2103/465—Water-sorbing agents, hygroscopic or hydrophilic agents
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P40/00—Technologies relating to the processing of minerals
    • Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding

Abstract

The present invention relates to the additives and its application method of a kind of improvement alkali slag cement stone cracking and water suction, belong to building material technical field, the additive in parts by mass, consists of the following components: 40-70 parts of stearate, 10-20 parts of alkali-activated slag retarder, 5-10 parts of organosilicon, 45-60 parts of calcium hydroxide.By the restriction for carrying out reasonably combined and each Ingredient Amount to each ingredient in the additive, the additive is set to can significantly improve the problem of Cracking of alkali slag cement stone, and then reduce the water imbibition of alkali slag cement stone, and the additive does not cause to negatively affect too much to the mechanical property of alkali slag cement stone, its synthetic method is simple, raw material are easy to get, and are suitble to industrialized production.

Description

A kind of additive and its application method improving alkali slag cement stone cracking and water suction
Technical field
The invention belongs to building material technical fields, and in particular to a kind of to improve alkali slag cement stone cracking and absorb water outer Add agent and its application method.
Background technique
Alkali slag cement (AAS) is a kind of novel hydraulic obtained with alkali metal compound excitation ground granulated blast-furnace slag Property cementitious material.Alkali slag cement stone, intensity is high and corrosion-resistant, and fire resistance, precenting chlorate corrosion etc. are superior to general silicic acid Salt cement, but its drying contraction is larger, is easier to cause the cracking of slurry, mortar or concrete than common portland cement, lead It causes its water imbibition to increase, finally induces various endurance issues, this has become the technology that alkali slag cement is widely used that restricts " bottleneck ".Since alkali slag cement hydration process is complicated, the poor hydrated product of order exists big in form and configuration aspects Measure microdefect, the problem of this is both that alkali slag cement stone is easily-deformable, cracking source and the big basic reason of its water imbibition it One.
Currently, the method for solving alkali slag cement stone cracking and water suction is as follows:
(1) metal ion swelling agent is mixed, such as common portland cement swelling agent, mechanism is to be formed to have relatively strong expansion The entringite of effect, and in alkali slag cement high alkali environment, entringite is difficult to be formed, the effect of expected expansion is not achieved, and The Ca (OH) of addition simultaneously2The condensation of alkali slag cement can be made too fast.
(2) economization agent is mixed, to reduce the surface tension of hole solution, but the economization agent for common portland cement is in alkali Adaptability and stability in slag high alkali environment is not high.
(3) mineral microparticle is mixed, the non-gelling for reaching toughening purpose by " pinning effect " of micro-aggregate, but mixing Mineral grain can reduce the gelling of alkali slag cement, make the reduction of its mechanical property.
However there is no to the glue for the method by adding swelling agent, economization agent and mineral admixture into alkali slag cement Microdefect inside gel material is changed, it is difficult to be improved the crack resistance of alkali slag cement stone from the root and be reduced water suction Property.Therefore, it is badly in need of one kind under the premise of guaranteeing alkali slag cement stone mechanical property, alkali slag cement stone cracking can be improved and inhales The additive of water.
Summary of the invention
In view of this, one of the objects of the present invention is to provide a kind of improvement alkali slag cement stone cracking and absorbing water additional Agent, the second purpose are to provide the application method of a kind of improvement alkali slag cement stone cracking and the additive to absorb water.
In order to achieve the above objectives, the invention provides the following technical scheme:
1, a kind of additive for improving alkali slag cement stone cracking and water suction, in parts by mass, the additive is by as follows Component composition: 40-70 parts of stearate, 10-20 parts of alkali-activated slag retarder, 5-10 parts of organosilicon, 45-60 parts of calcium hydroxide.
Preferably, in parts by mass, the additive consists of the following components: 40 parts of stearate, alkali-activated slag retarder 10 parts, 5 parts of organosilicon, hydroxide Ca45 part.
Preferably, in parts by mass, the additive consists of the following components: 50 parts of stearate, alkali-activated slag retarder 12 parts, 6 parts of organosilicon, 50 parts of calcium hydroxide.
Preferably, in parts by mass, the additive consists of the following components: 60 parts of stearate, alkali-activated slag retarder 15 parts, 8 parts of organosilicon, 55 parts of calcium hydroxide.
Preferably, in parts by mass, the additive consists of the following components: 70 parts of stearate, alkali-activated slag retarder 20 parts, 10 parts of organosilicon, 60 parts of calcium hydroxide.
Preferably, the stearate is one of calcium stearate, odium stearate, magnesium stearate or zinc stearate.
2, the application method of the additive, the method specifically: additive described in alkali slag cement is mixed It is 4-8wt% with amount.
Preferably, the blending amount of additive described in alkali slag cement is 4wt%.
The beneficial effects of the present invention are: the present invention provides a kind of improvement alkali slag cement stone cracking and absorb water additional Agent and its application method keep this additional by carrying out the restriction of reasonably combined and each Ingredient Amount to each ingredient in the additive Agent can significantly improve the problem of Cracking of alkali slag cement stone, and then reduce the water imbibition of alkali slag cement stone, and the additive The mechanical property of alkali slag cement is had no adverse effect, synthetic method is simple, and raw material are easy to get, and is suitble to industrialized production.
The effect of each component is as follows in the additive:
Stearate: as the principal component of the additive, rising improves alkali slag cement stone microdefect and reduces water suction Effect.The mechanism of action is, stearate has a surface-active action, when slag aquation, is adsorbed in hydrated product gel particle Surface reduces reciprocation and cohesiveness between gel particle, is conducive to the dispersion of hydrated product (gel particle), Jin Erjia The order of strong gel particle space networks structure, reduces the microdefect of alkali slag cement stone solid phase micro-structure, to improve alkali mine The crack resistance of pulp water mudstone.In addition, being adsorbed in the stearate of alkali slag cement stone has film forming characteristics, the film layer is by a large amount of alkane Base functional group is constituted, and has stronger hydrophobicity, to reduce the water imbibition of alkali slag cement stone.
Alkali-activated slag retarder: the tune as the additive coagulates component.By University Of Chongqing's independent research and obtain country's invention specially Benefit authorization.Stearate shifts to an earlier date alkali slag cement slurry initial set, can operate to the facilitation of alkali slag cement early hydration Time is reduced.This is one of deficiency when stearate is individually modified alkali slag cement stone, introduces alkali mine in additive thus Slag retarder, to guarantee the operability of alkali slag cement slurry.Meanwhile alkali-activated slag retarder can make alkali slag cement aquation When have sufficient condensation firm time, be conducive to the ordered arrangement of water mudrock microcosmos structure, the coordinative role with stearate Further decrease microdefect.
Organosilicon: the defoaming component as the additive.The foam stabilizing characteristic of stearate makes alkali slag cement stirring molding When the bubble that introduces be difficult to eliminate, the mechanical property of alkali slag cement stone reduces.This is the modified alkali slag cement stone of stearate When another shortcoming, organosilicon is introduced in additive thus, to cut down the bubble inside alkali slag cement stone, improves water The mechanical property of mudstone.In addition, organosilicon also has hydrophobicity, it is adsorbed in alkali slag cement stone surface, further decreases alkali The water imbibition of slag cements stone.
Calcium hydroxide: the dispersed component as the additive.Stearate is light to be insoluble in water, in alkali slag cement slurry It can reunite when stirring, dispersibility is poor, and functioning efficiency is low.When this is stearate modified alkali slag cement stone it is another not Foot place, thus by stearate the above components and calcium hydroxide mix grinding, to improve stearate in alkali slag cement Dispersibility and functioning efficiency.In addition, calcium hydroxide can optimize the pore-size distribution of alkali slag cement stone, capillary pressure is reduced, into The crack resistance of one step raising alkali slag cement.
By the synergistic effect of the above components, the microdefect inside alkali slag cement stone is reduced, and in alkali-activated slag water Hydrophobic membranous layer is introduced on mudstone pore wall, from the root improves the crack resistance of alkali slag cement stone, and water imbibition reduces.
Detailed description of the invention
In order to keep the purpose of the present invention, technical scheme and beneficial effects clearer, the present invention provides following attached drawing and carries out Illustrate:
Fig. 1 is alkali slag cement test specimen 1, alkali slag cement test specimen 1-1 and alkali slag cement test specimen 1-2 intensity test Figure；
Fig. 2 is the dry front and back dry shrinkage and cracking situation comparison diagram of alkali slag cement test specimen 1；(A is the photo before drying, B in figure It is the photo after drying)
Fig. 3 is the dry front and back dry shrinkage and cracking situation comparison diagram of alkali slag cement test specimen 1-1；(A is the photograph before drying in figure Piece, B are the photo after drying)
Fig. 4 is the dry front and back dry shrinkage and cracking situation comparison diagram of alkali slag cement test specimen 1-2；(A is the photograph before drying in figure Piece, B are the photo after drying)
Fig. 5 is after alkali slag cement test specimen 1, alkali slag cement test specimen 1-1 and alkali slag cement test specimen 1-2 are dried 500 Scanning electron microscope (SEM) photograph under times；(A is the scanning electron microscope (SEM) photograph of alkali slag cement test specimen 1, the scanning electricity that B is alkali slag cement test specimen 1-1 Mirror figure, C are the scanning electron microscope (SEM) photograph of alkali slag cement test specimen 1-2)
Fig. 6 is the dry back aperture point of alkali slag cement test specimen 1, alkali slag cement test specimen 1-1 and alkali slag cement test specimen 1-2 Butut；
Fig. 7 is alkali slag cement test specimen 1, alkali slag cement test specimen 1-1 and the test of alkali slag cement test specimen 1-2 water imbibition Figure；
Fig. 8 is after alkali slag cement test specimen 1, alkali slag cement test specimen 1-1 and alkali slag cement test specimen 1-2 are dried 5000 Scanning electron microscope (SEM) photograph under times；(A is the scanning electron microscope (SEM) photograph of alkali slag cement test specimen 1, the scanning electricity that B is alkali slag cement test specimen 1-1 Mirror figure, C are the scanning electron microscope (SEM) photograph of alkali slag cement test specimen 1-2)
Fig. 9 is that alkali slag cement test specimen 1, alkali slag cement test specimen 1-1 and alkali slag cement test specimen 1-2 hole tortuosity are surveyed Attempt；
Figure 10 is that alkali slag cement test specimen 1, alkali slag cement test specimen 2-1 and alkali slag cement test specimen 2-2 compression strength are surveyed Attempt；
Figure 11 is the dry front and back dry shrinkage and cracking situation comparison diagram of alkali slag cement test specimen 2-1；(A is the photograph before drying in figure Piece, B are the photo after drying)
Figure 12 is the dry front and back dry shrinkage and cracking situation comparison diagram of alkali slag cement test specimen 2-2；(A is the photograph before drying in figure Piece, B are the photo after drying)
Figure 13 is alkali slag cement test specimen 1, alkali slag cement test specimen 2-1 and the test of alkali slag cement test specimen 2-2 water imbibition Figure；
Figure 14 is that alkali slag cement test specimen 1, alkali slag cement test specimen 3-1 and alkali slag cement test specimen 3-2 compression strength are surveyed Attempt；
Figure 15 is the dry front and back dry shrinkage and cracking situation comparison diagram of alkali slag cement test specimen 3-1；(A is the photograph before drying in figure Piece, B are the photo after drying)
Figure 16 is the dry front and back dry shrinkage and cracking situation comparison diagram of alkali slag cement test specimen 3-2；(A is the photograph before drying in figure Piece, B are the photo after drying)
Figure 17 is alkali slag cement test specimen 1, alkali slag cement test specimen 3-1 and the test of alkali slag cement test specimen 3-2 water imbibition Figure；
Figure 18 is that alkali slag cement test specimen 1, alkali slag cement test specimen 4-1 and alkali slag cement test specimen 4-2 compression strength are surveyed Attempt；
Figure 19 is the dry front and back dry shrinkage and cracking situation comparison diagram of alkali slag cement test specimen 4-1；(A is the photograph before drying in figure Piece, B are the photo after drying)
Figure 20 is the dry front and back dry shrinkage and cracking situation comparison diagram of alkali slag cement test specimen 4-2；(A is the photograph before drying in figure Piece, B are the photo after drying)
Figure 21 is alkali slag cement test specimen 1, alkali slag cement test specimen 4-1 and the test of alkali slag cement test specimen 4-2 water imbibition Figure.
Specific embodiment
Below by a preferred embodiment of the present invention will be described in detail.
Comparative example
Prepare alkali slag cement test specimen
Using net slurry blender, the waterglass that water and modulus are 1.5 is added into slag, stirs 30s slowly, stops 10s for pot wall On powder scrape in pot, then stir 60s fastly, then form the slurry stirred evenly, in relative humidity 95%, 20 DEG C of temperature It conserves in curing box and demoulds afterwards for 24 hours, and continue to conserve 28 days in curing box, obtain alkali slag cement test specimen 1, the alkali-activated slag water The alkali equivalent of mud test specimen 1 is 5%, water-cement ratio 0.45.
Embodiment 1
1, the additive of a kind of improvement alkali slag cement stone cracking and water suction is prepared
Ball mill is used after 40 parts of calcium stearates, 10 parts of alkali-activated slag retarder, 5 parts of organosilicons and 45 parts of calcium hydroxides are mixed Grinding 30min, then through vibromill grinding 30min, the additive for improving alkali exciting slag cement cracking and water suction is made.
2, alkali slag cement test specimen is prepared
Using net slurry blender, first by the additive prepared in 1 and slag dry mixing 30s, water then is added and modulus is 1.5 waterglass, stirs 30s slowly, stops 10s and scrapes the powder in pot wall in pot, then stirs 60s fastly, the slurry that then will be stirred evenly It is body formed, it conserves in relative humidity 95%, the curing box that 20 DEG C of temperature and demoulds afterwards for 24 hours, and continue to conserve 28 in curing box It.Volume, alkali equivalent and the water-cement ratio of additive are referring to table 1 in each alkali slag cement test specimen of preparation.
Table 1
Mechanics Performance Testing is carried out to test specimen 1, test specimen 1-1 and 1-2, test result is shown in Fig. 1, as shown in Figure 1, compares and does not add The alkali slag cement test specimen for entering additive, the compression strength that joined the alkali slag cement test specimen of additive are increased slightly, and with Increasing for admixture dosage, intensity reduce degree become larger, show that the additive has increasing to the mechanical property of alkali slag cement stone Pretend use.
Test specimen 1, the excision of test specimen 1-1 and 1-2 surface layer laitance are leaked out into internal layer slurry first and taken pictures, then by test specimen 1, examination Part 1-1 and 1-2 are put into 40 DEG C, and drying 48 hours, takes pictures again in the baking oven of relative humidity 25%, compare the dry each test specimen in front and back The development in crack, is as a result shown in Fig. 2, Fig. 3 and Fig. 4, wherein A is the photo before drying in three width figures, after B is dry Photo, comparison diagram 2, Fig. 3 and Fig. 4 it is found that incorporation additive after, the dry shrinkage and cracking of alkali slag cement test specimen has obtained obviously changing It is kind.
In order to further observe additive to the improvement of alkali slag cement test specimen dry shrinkage and cracking after dry, with pliers from The fritter that length, width and height about 4-7mm is clamped on each test specimen, is dried 48 hours with 40 DEG C in a vacuum drying oven.Existed with scanning electron microscope Additive is observed under 500 times to the improvement of alkali slag cement test specimen dry shrinkage and cracking, as a result as shown in figure 5, A is outer in Fig. 5 Adding agent volume is 0% alkali slag cement test specimen scanning electron microscope (SEM) photograph, and B is that the alkali slag cement test specimen that admixture dosage is 4% is swept Electron microscope is retouched, C is the alkali slag cement test specimen scanning electron microscope (SEM) photograph that admixture dosage is 8%, by alkali slag cement in B in Fig. 5 and C The cracking degree of test specimen is significantly less than the cracking degree of alkali slag cement test specimen in A, further illustrates, after mixing additive, alkali The dry shrinkage and cracking of slag cements test specimen is obviously improved.
Capillary tension is the basic reason for causing alkali slag cement temperature-caused shrinkage to generate and increase, capillary tension Theory thinks that capillary tension is represented by (Laplace's equation):
In formula- capillary tension；
σ-surface tension of liquid；
r1, r2The radius of curvature of-capillary water.By formula as it can be seen that influencingImportant parameter be σ and r.For this purpose, with Pliers clamps the fritter of length, width and height about 4-7mm from each test specimen again, is dried 48 hours with 40 DEG C in a vacuum drying oven, uses MIP The pore-size distribution variation for testing alkali slag cement test specimen after mixing additive, as a result as shown in fig. 6, it will be appreciated from fig. 6 that with outer Add the increase of agent volume, pore-size distribution of the alkali slag cement test specimen within the scope of 9.1-21.1nm is gradually increased, i.e. r increases, and is made Capillary tension reduces, and the contraction distortion of alkali slag cement test specimen reduces when illustrating dry, and cracking is improved.
According to the water imbibition of ASTM C1585 test test specimen 1, test specimen 1-1 and 1-2, test results are shown in figure 7, by Fig. 7 It is found that compared to the alkali slag cement test specimen that additive is not added, the water imbibition that joined the alkali slag cement test specimen of additive is The 1/5 of the alkali slag cement test specimen water imbibition of additive is not added, illustrates that additive can be effectively improved the suction of alkali slag cement It is aqueous.
In order to further investigate additive to the improvement result of alkali slag cement test specimen water imbibition, with scanning electron microscope 5000 Pattern under times inside observation alkali slag cement test specimen, as a result as shown in Figure 8.A is the alkali mine that admixture dosage is 0% in Fig. 8 Slag cement test specimen scanning electron microscope (SEM) photograph, B are the alkali slag cement test specimen scanning electron microscope (SEM) photograph that admixture dosage is 4%, and C mixes for additive The alkali slag cement test specimen scanning electron microscope (SEM) photograph that amount is 8%, B and C can be seen that the pore wall of alkali slag cement test specimen from Fig. 8 On have one layer of hydrophobic membranous layer, which be greatly reduced the water imbibition of alkali slag cement stone.
The tortuosity τ of the pore structure of test specimen 1, test specimen 1-1 and 1-2 is calculated, calculation formula is as follows:
In formula: αenThe maximum percentage into mercury volume is accounted for be detained mercury volume, is read by MIP data, calculated result such as Fig. 9 Shown, as shown in Figure 9, the hole tortuosity of alkali slag cement test specimen increases and becomes larger with additive incorporation, i.e. moisture Transmission range in the hole of alkali slag cement test specimen becomes larger, and further illustrates that additive can be obviously improved alkali slag cement The water imbibition of test specimen.
Embodiment 2
1, the additive of a kind of improvement alkali slag cement stone cracking and water suction is prepared
Ball mill is used after 50 parts of calcium stearates, 12 parts of alkali-activated slag retarder, 6 parts of organosilicons and 50 parts of calcium hydroxides are mixed Grinding 30min, then through vibromill grinding 30min, the additive for improving alkali exciting slag cement cracking and water suction is made.
Referring to alkali slag cement test specimen method is prepared in embodiment 1, alkali slag cement test specimen is prepared with above-mentioned additive, is made The test specimen obtained is respectively 2-1 and 2-2.
Mechanics Performance Testing is carried out to test specimen 1, test specimen 2-1 and 2-2, test result is shown in Figure 10, as shown in Figure 10, preceding 14 It, compared to the alkali slag cement test specimen that additive is not added, the compression strength that joined the alkali slag cement test specimen of additive is omited There are increase, and increasing with admixture dosage, Strength Changes degree is little, illustrates additive to alkali slag cement stone mechanical property There can be humidification.
Test specimen 2-1 and 2-2 surface layer laitance is cut off first and leaks out internal layer slurry and takes pictures, then puts test specimen 2-1 and 2-2 Enter 40 DEG C, drying 48 hours, takes pictures again in the baking oven of relative humidity 25%, compares the development feelings in the dry each test specimen crack in front and back Condition, the result is shown in Figure 11 and 12, wherein A is the photo before drying in two width figures, and B is the photo after drying, comparison diagram 2, figure It is found that after incorporation additive, the dry shrinkage and cracking of alkali slag cement test specimen is obviously improved 11 and Figure 12.
According to the water imbibition of ASTM C1585 test test specimen 1, test specimen 2-1 and 2-2, test result is as shown in figure 13, by scheming 13 it is found that alkali slag cement test specimen water imbibition increasing and reduce with additive incorporation, illustrate that additive can be effective Improve the water imbibition of alkali slag cement, wherein compared to the alkali slag cement test specimen that additive is not added, additive incorporation is The water imbibition of 8% alkali slag cement test specimen be not added additive alkali slag cement test specimen water imbibition 1/5.
Embodiment 3
1, the additive of a kind of improvement alkali slag cement stone cracking and water suction is prepared
Ball mill is used after 60 parts of calcium stearates, 15 parts of alkali-activated slag retarder, 8 parts of organosilicons and 55 parts of calcium hydroxides are mixed Grinding 30min, then through vibromill grinding 30min, the additive for improving alkali exciting slag cement cracking and water suction is made.
Referring to alkali slag cement test specimen method is prepared in embodiment 1, alkali slag cement test specimen is prepared with above-mentioned additive, is made The test specimen obtained is respectively 3-1 and 3-2.
Mechanics Performance Testing is carried out to test specimen 1, test specimen 3-1 and 3-2, test result is shown in Figure 14, as shown in Figure 14, compared to not The alkali slag cement test specimen of additive is added, the compression strength that joined the alkali slag cement test specimen of additive is increased slightly, and With increasing for admixture dosage, Strength Changes degree is little, shows that the additive has increasing to alkali slag cement stone mechanical property Pretend use.
Test specimen 3-1 and 3-2 surface layer laitance is cut off first and leaks out internal layer slurry and takes pictures, then puts test specimen 3-1 and 3-2 Enter 40 DEG C, drying 48 hours, takes pictures again in the baking oven of relative humidity 25%, compares the development feelings in the dry each test specimen crack in front and back Condition, the result is shown in Figure 15 and 16, wherein A is the photo before drying in two width figures, and B is the photo after drying, comparison diagram 2, figure It is found that after incorporation additive, the dry shrinkage and cracking of alkali slag cement test specimen is obviously improved 15 and Figure 16.
According to the water imbibition of ASTM C1585 test test specimen 1, test specimen 3-1 and 3-2, test result is as shown in figure 17, by scheming 17 it is found that joined the water imbibition of the alkali slag cement test specimen of additive compared to the alkali slag cement test specimen that additive is not added For be not added additive alkali slag cement test specimen water imbibition 1/5, illustrate that additive can be effectively improved alkali slag cement Water imbibition.
Embodiment 4
1, the additive of a kind of improvement alkali slag cement stone cracking and water suction is prepared
Ball milling is used after 70 parts of calcium stearates, 20 parts of alkali-activated slag retarder, 10 parts of organosilicons and 60 parts of calcium hydroxides are mixed Machine grinding 30min, then through vibromill grinding 30min, the additive for improving alkali exciting slag cement cracking and water suction is made.
Referring to alkali slag cement test specimen method is prepared in embodiment 1, alkali slag cement test specimen is prepared with above-mentioned additive, is made The test specimen obtained is respectively 4-1 and 4-2.
Mechanics Performance Testing is carried out to test specimen 1, test specimen 4-1 and 4-2, test result is shown in Figure 18, as shown in Figure 18, works as age When being 28 days, the compression strength for the alkali slag cement test specimen that additive addition content is 8% and the alkali-activated slag water that additive is not added The compression strength of mud test specimen remains basically stable, and the compression strength for the alkali slag cement test specimen that additive addition content is 4%, which is higher than, not to be added The compression strength for entering the alkali slag cement test specimen of additive illustrates that additive is advantageous to the growth of alkali slag cement later strength.
Test specimen 4-1 and 4-2 surface layer laitance is cut off first and leaks out internal layer slurry and takes pictures, then puts test specimen 4-1 and 4-2 Enter 40 DEG C, drying 48 hours, takes pictures again in the baking oven of relative humidity 25%, compares the development feelings in the dry each test specimen crack in front and back Condition, the result is shown in Figure 19 and 20, wherein A is the photo before drying in two width figures, and B is the photo after drying, comparison diagram 2, figure It is found that after incorporation additive, the dry shrinkage and cracking of alkali slag cement test specimen is obviously improved 19 and Figure 20.
According to the water imbibition of ASTM C1585 test test specimen 1, test specimen 4-1 and 4-2, test result is as shown in figure 21, by scheming 21 it is found that alkali slag cement test specimen water imbibition increasing and reduce with additive incorporation, illustrate that additive can be effective Improve the water imbibition of alkali slag cement, wherein compared to the alkali slag cement test specimen that additive is not added, additive incorporation is The water imbibition of 8% alkali slag cement test specimen be not added additive alkali slag cement test specimen water imbibition 1/5.
Finally, it is stated that preferred embodiment above is only used to illustrate the technical scheme of the present invention and not to limit it, although logical It crosses above preferred embodiment the present invention is described in detail, however, those skilled in the art should understand that, can be Various changes are made to it in form and in details, without departing from claims of the present invention limited range.

Claims (8)

1. a kind of additive for improving alkali slag cement stone cracking and water suction, which is characterized in that in parts by mass, the additive It consists of the following components: 40-70 parts of stearate, 10-20 parts of alkali-activated slag retarder, 5-10 parts of organosilicon, calcium hydroxide 45-60 Part.
2. a kind of additive for improving alkali slag cement stone cracking and water suction as described in claim 1, which is characterized in that press matter Part meter is measured, the additive consists of the following components: 40 parts of stearate, 10 parts of alkali-activated slag retarder, 5 parts of organosilicon, hydrogen-oxygen Change Ca45 part.
3. a kind of additive for improving alkali slag cement stone cracking and water suction as described in claim 1, which is characterized in that press matter Part meter is measured, the additive consists of the following components: 50 parts of stearate, 12 parts of alkali-activated slag retarder, 6 parts of organosilicon, hydrogen-oxygen Change 50 parts of calcium.
4. a kind of additive for improving alkali slag cement stone cracking and water suction as described in claim 1, which is characterized in that press matter Part meter is measured, the additive consists of the following components: 60 parts of stearate, 15 parts of alkali-activated slag retarder, 8 parts of organosilicon, hydrogen-oxygen Change 55 parts of calcium.
5. a kind of additive for improving alkali slag cement stone cracking and water suction as described in claim 1, which is characterized in that press matter Part meter is measured, the additive consists of the following components: 70 parts of stearate, 20 parts of alkali-activated slag retarder, 10 parts of organosilicon, hydrogen-oxygen Change 60 parts of calcium.
6. a kind of additive for improving alkali slag cement stone cracking and water suction according to any one of claims 1-4, feature It is, the stearate is one of calcium stearate, odium stearate, magnesium stearate or zinc stearate.
7. the application method of the described in any item additives of claim 1-4, which is characterized in that the method specifically: alkali mine The blending amount of additive described in slag cement is 4-8wt%.
8. application method as claimed in claim 7, which is characterized in that the blending amount of additive described in alkali slag cement is 4wt%.
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