CN111620655B - Polymer mortar and preparation method thereof - Google Patents
Polymer mortar and preparation method thereof Download PDFInfo
- Publication number
- CN111620655B CN111620655B CN202010522481.8A CN202010522481A CN111620655B CN 111620655 B CN111620655 B CN 111620655B CN 202010522481 A CN202010522481 A CN 202010522481A CN 111620655 B CN111620655 B CN 111620655B
- Authority
- CN
- China
- Prior art keywords
- polymer
- powder
- parts
- emulsion
- polymer mortar
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/14—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements
-
- 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
- C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B14/02—Granular materials, e.g. microballoons
- C04B14/04—Silica-rich materials; Silicates
- C04B14/20—Mica; Vermiculite
-
- 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
- C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B14/38—Fibrous materials; Whiskers
- C04B14/383—Whiskers
-
- 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
- C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
- C04B24/24—Macromolecular compounds
- C04B24/26—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
- C04B24/2641—Polyacrylates; Polymethacrylates
-
- 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
- C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
- C04B24/24—Macromolecular compounds
- C04B24/26—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
- C04B24/2676—Polystyrenes
-
- 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
- C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
- C04B24/24—Macromolecular compounds
- C04B24/26—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
- C04B24/2682—Halogen containing polymers, e.g. PVC
-
- 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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/76—Use at unusual temperatures, e.g. sub-zero
-
- 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
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/10—Mortars, concrete or artificial stone characterised by specific physical values for the viscosity
-
- 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
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Civil Engineering (AREA)
- Inorganic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention provides polymer mortar and a preparation method thereof, wherein the polymer mortar comprises the following raw material components in parts by weight: 90-100 parts of quick-hardening sulphoaluminate cement, 35-45 parts of polymer emulsion, 2-3 parts of superfine powder, 5-10 parts of gypsum powder, 5-10 parts of expanding agent, 190-210 parts of sand, 30-40 parts of water, 0.5-1.0 part of powder water reducing agent, 0.5-1.0 part of polymer fiber, 0-0.05 part of hardening accelerator, 0-0.05 part of retarder and 0.3-0.8 part of defoaming agent. The method comprises the steps of preparing dry powder, preparing pre-dispersion emulsion, and finally putting the dry powder, the pre-dispersion emulsion, water and a defoaming agent into a stirrer to be mixed and stirred for 1-3 minutes to be in a uniform state to prepare the polymer mortar. The invention can meet the construction requirements of the CRTS II slab ballastless track filling layer.
Description
Technical Field
The invention relates to the technical field of concrete materials, in particular to polymer mortar and a preparation method thereof.
Background
The technical prototype of the CRTS II slab ballastless track originates from germany. The research on the longitudinal-connected slab ballastless track starts in 1977 in Germany, and linear and curved test sections of the CRTS II slab ballastless track are respectively built in 1999. In 2006, a German New England-Engo Gorstat ultra high speed railway is formally opened for operation, and a CRTS II type plate ballastless track with the length of about 70km is paved on the section of the railway. Compared with the CRTS I type slab ballastless track technology from Japan, the CRTS II type slab ballastless track is relatively late in application, and a mature maintenance and repair technology is not formed yet. Since the relevant Germany technology is introduced from the country, the country forms the independent technical characteristics on the basis of absorbing the advanced foreign experience, and accumulates and compiles the complete construction, maintenance and operation maintenance technology. The Jingjin intercity railway built in 2008 is the first high-speed railway adopting CRTS II type plate track structure in China, and passenger special lines such as Jinghu, Shiwu, Hukun and the like which are built next to China also adopt the track structure. However, with the increase of the operation life, various serious diseases appear on the CRTS II slab ballastless track, and the track structure needs to be partially or even integrally replaced.
According to the field investigation result of the structural damage condition of the CRTS II type slab ballastless track, the main forms of serious damage are found to be track slab fragmentation and CA mortar filling layer damage. In order to ensure the safe operation of the high-speed railway, the damaged parts need to be replaced in time. Generally, repairing a damaged track slab or a damaged filling layer requires re-pouring mortar into the filling layer. However, the operation skylight time on the high-speed rail operation line is only 4-5 hours, and the application requirement of filling layer replacement cannot be met by adopting the common CA mortar, so that special rapid hardening mortar needs to be developed to meet the maintenance requirement. According to the technical specification of maintenance and repair of the CRTS II type slab ballastless track, the rapid hardening mortar needs to have enough working time and high hardening speed, develops enough strength and rigidity within 2 hours, can support the track slab and the vibration load generated by train operation, and has similar elastic modulus with CA mortar, firm bonding with the track slab and good durability.
In recent years, polymer mortar has been widely used as a concrete repair material. For example, the invention patent with the application number of 201810636651.8 discloses a high-performance polymer mortar and a preparation method thereof, wherein the polymer mortar comprises the following raw materials: portland cement, quartz sand, a water reducing agent, an anti-aging agent, a polymer, lignocellulose, a defoaming agent, calcium carbonate whiskers and inorganic nanoparticles. The preparation method comprises the steps of activating quartz sand, calcium carbonate whiskers and inorganic nanoparticles, adding the water reducing agent, the anti-aging agent, the polymer, the lignocellulose and the defoaming agent into the portland cement, stirring uniformly, adding the activated mixture, and stirring uniformly to obtain the water-based cement. The polymer in the invention is a mixed polymer of ethylene-vinyl acetate copolymer, acrylic acid copolymer and polyvinyl alcohol. The invention patent with application number 201810271268.7 discloses a special cement-based polymer mortar for repairing and a preparation method thereof, wherein the mortar comprises the following raw materials: the modified gypsum comprises the following components of volcanic mud of a Wudalianchi, modified composite mineral micro powder, phosphogypsum slag, sodium bentonite, diabase fiber, aminopropyltriethoxysilane, silicone polyether emulsion, sodium tripolyphosphate, polyacrylamide, calcium chloride, an adhesion auxiliary agent, a water reducing agent, a foaming agent and an anti-irradiation agent. The preparation method is prepared by mixing and grinding the raw materials. The performance of the polymer mortar related in the two patents does not meet the construction requirements of a CRTS II slab ballastless track filling layer, is not suitable for pouring construction, and does not meet the mortar performance standard in the current ballastless track maintenance course.
In conclusion, a polymer mortar and a preparation method thereof are urgently needed to solve the problems that the performance of the polymer mortar in the prior art cannot meet the construction requirements of a CRTS II type slab ballastless track filling layer and the mortar performance standard in the current ballastless track maintenance course.
Disclosure of Invention
The first purpose of the invention is to provide a polymer mortar, which has the following specific technical scheme:
the polymer mortar comprises the following raw material components in parts by weight: 90-100 parts of quick-hardening sulphoaluminate cement, 35-45 parts of polymer emulsion, 2-3 parts of superfine powder, 5-10 parts of gypsum powder, 5-10 parts of expanding agent, 190-210 parts of sand, 30-40 parts of water, 0.5-1.0 part of powder water reducing agent, 0.5-1.0 part of polymer fiber, 0-0.05 part of hardening accelerator, 0-0.05 part of retarder and 0.3-0.8 part of defoaming agent.
Preferably, the polymer emulsion comprises at least one of a styrene-acrylic emulsion, a styrene-butadiene emulsion, a polyacrylate emulsion and a neoprene latex emulsion.
Preferably, the viscosity of the polymer emulsion is 50mPa & s-1000mPa & s, the solid content is 40-50%, and the minimum film-forming temperature is not more than 10 ℃.
Preferably, the superfine powder is a mixture of superfine muscovite powder and calcium carbonate whiskers, wherein the fineness of the superfine muscovite powder is 1200 meshes, the length-diameter ratio of the calcium carbonate whiskers is 20:1-30:1, and the mass ratio of the superfine muscovite powder to the calcium carbonate whiskers is 3: 2.
Preferably, the expanding agent is a magnesium oxide expanding agent, the calcining temperature of the magnesium oxide expanding agent is 1150 ℃, and the content of magnesium oxide is 85%.
Preferably, the polymer fiber is polypropylene fiber or polyvinyl alcohol fiber, the length of the polymer fiber is 5mm-9mm, and the diameter is 20 μm-40 μm.
Preferably, the hardening accelerator comprises at least one of lithium carbonate and lithium chloride; the retarder comprises one of sodium gluconate, borax and tartaric acid; the defoaming agent comprises at least one of polyether defoaming agent, alcohol defoaming agent and fatty acid defoaming agent.
Preferably, the rapid hardening sulphoaluminate cement is marked by 42.5 or more; the gypsum powder is semi-hydrated fiber gypsum powder; the powder water reducing agent is a polycarboxylic acid powder water reducing agent, and the water reducing rate is 25-30%; the sand is machine-made sand or river sand, the maximum particle size is less than 2.38mm, the fineness modulus is 2.4-2.7, and the grading curve is a zone II.
The second purpose of the invention is to provide a preparation method of polymer mortar, which comprises the following specific technical scheme:
a preparation method of polymer mortar comprises the following steps:
step 1: uniformly mixing quick-hardening sulphoaluminate cement, gypsum powder, an expanding agent, sand, a powder water reducing agent, polymer fibers, a retarder and a hardening accelerator in raw material components to prepare a dry powder material;
step 2: adding superfine powder in the raw material components into the polymer emulsion and uniformly mixing to prepare pre-dispersed emulsion;
and step 3: and putting the dry powder, the pre-dispersed emulsion, the water and the defoaming agent into a stirrer, and mixing and stirring for 1-3 minutes to be uniform to prepare the polymer mortar.
Preferably, the prepared polymer mortar is adaptive to the environment temperature of 5-35 ℃.
The technical scheme of the invention has the following beneficial effects:
(1) the polymer mortar disclosed by the invention adopts the polymer emulsion to replace emulsified asphalt, so that the production and storage cost is reduced, and the adverse environmental influence generated in the construction process of the traditional CA mortar is greatly eliminated. The polymer mortar with proper fluidity is obtained by selecting polymer emulsions with different types, different viscosities and different glass transition temperatures and adjusting the dosage of the polymer emulsions, the quick-hardening sulphoaluminate cement and the water reducing agent. On the basis, the superfine muscovite powder, the calcium carbonate crystal whiskers and the semi-hydrated fiber gypsum powder are selected to improve the static and dynamic stability of the polymer mortar, and the phenomena of segregation, bleeding and sand setting are avoided. Meanwhile, the dosage of the polymer emulsion, the semi-water fiber gypsum powder, the hardening accelerator and the retarder is adjusted, so that the polymer mortar has proper fluidity retention time, and can meet the requirements of early-age strength and elastic modulus. The raw materials adopted by the invention are wide in source, the prepared polymer mortar is good in quality stability, the performance of the polymer mortar meets the construction requirement of a CRTS II slab ballastless track filling layer and the mortar performance standard in the current ballastless track maintenance course, and the construction efficiency and the engineering quality are effectively ensured.
(2) The polymer mortar provided by the invention regulates the hydration process of the quick-hardening sulphoaluminate cement by adjusting the weight parts of the quick-hardening sulphoaluminate cement, the polymer emulsion and the semi-hydrated fiber gypsum powder and adding the magnesia expanding agent with relatively low activity, so that the shrinkage rate of the polymer mortar is improved, even the polymer mortar generates micro-expansion, the requirement of the shrinkage rate is met, the magnesia expanding agent can fill the common micro-cracks in the quick-hardening sulphoaluminate cement in the later hydration process, and the later strength shrinkage phenomenon can be improved.
(3) The polymer mortar of the invention adopts superfine powder and semi-hydrated fiber gypsum powder to improve the cohesiveness of the polymer mortar. By utilizing the good dispersibility of the polymer emulsion, the superfine powder is pre-dispersed in the polymer emulsion, and the action effect of the superfine powder in the polymer mortar is improved. In addition, the superfine muscovite powder is flaky, and the calcium carbonate crystal whisker and the semi-hydrated fiber gypsum powder are fibrous, so that the calcium carbonate crystal whisker, the semi-hydrated fiber gypsum powder and the semi-hydrated fiber gypsum powder can also play a good morphological effect and a synergistic effect in the polymer mortar, reduce bleeding in the newly prepared polymer mortar (namely the polymer mortar before hardening), and improve the stability of the aggregate; in the process of hardening the polymer mortar, the microfiber function is exerted, and the mechanical property of the polymer mortar is improved.
(4) The retarding effect of the polymer emulsion on the quick-hardening sulphoaluminate cement is utilized, the consumption of the retarder and the hardening accelerator is reduced, the polymer mortar can meet the fluidity requirement within 30min of window time only by a small amount of the hardening accelerator under the condition of 20 ℃, and can be quickly hardened after the construction is finished, sufficient strength is developed within 2h, and the normal operation requirement of the high-speed railway after the construction is met. Meanwhile, according to different working conditions of different areas, by adjusting the relative amounts of the quick-hardening sulphoaluminate cement, the polymer emulsion, the superfine powder, the gypsum powder, the retarder and the hardening accelerator, the consistency regulation of the working time, hydration, compressive strength and shrinkage rate of the polymer mortar at different temperatures can be realized, and the temperature adaptability of the polymer mortar is improved.
(5) The polymer mortar can introduce a proper amount of bubbles during subsequent mixing and stirring by regulating and controlling the viscosity of the polymer emulsion, the solid content of the polymer emulsion and the dosage of the polymer emulsion and the quick-hardening sulphoaluminate cement. Meanwhile, a proper amount of superfine powder and semi-hydrated fiber gypsum powder are added, so that the polymer mortar has good cohesiveness while keeping high fluidity. The addition of a proper amount of the defoaming agent can remove large-size harmful bubbles in the polymer mortar, reduce the generation of bubble aggregation of the contact surface of the polymer mortar and the track slab after pouring, improve the quality of a bonding interface and improve the bonding strength of the bonding interface.
(6) The polymer mortar has the performance meeting the construction requirements of a CRTS II slab ballastless track filling layer and the mortar performance standard in the current ballastless track maintenance course under the condition of different simulated environment temperatures of 5-35 ℃, and effectively ensures the construction efficiency and the engineering quality.
(7) The preparation method of the polymer mortar comprises the steps of preparing the dry powder, preparing the pre-dispersion emulsion, and finally putting the dry powder, the pre-dispersion emulsion, water and the defoaming agent into a stirrer to be mixed and stirred for 1-3 minutes to be in a uniform state on a construction site to prepare the polymer mortar, so that the working steps of the construction site are reduced, the construction difficulty is reduced, and the construction efficiency is improved. The preparation method provided by the invention is simple in steps and easy to prepare.
In addition to the objects, features and advantages described above, other objects, features and advantages of the present invention are also provided. The present invention will be described in further detail with reference to examples.
Detailed Description
The following is a detailed description of embodiments of the invention, but the invention can be implemented in many different ways, as defined and covered by the claims.
Example 1 (simulated ambient temperature 35 ℃):
the polymer mortar comprises the following raw material components in parts by weight in one cubic meter of concrete: 90 parts of quick-hardening sulphoaluminate cement, 45 parts of polymer emulsion, 2 parts of superfine powder, 5 parts of gypsum powder, 10 parts of expanding agent, 190 parts of sand, 30 parts of water, 1.0 part of powder water reducing agent, 0.5 part of polymer fiber, 0 part of hardening accelerator, 0.04 part of retarder and 0.3 part of defoaming agent.
The polymer emulsion is butylbenzene emulsion, the viscosity is 80mPa.s, the solid content is 50%, and the lowest film forming temperature is 0 ℃.
The superfine powder is a mixture of superfine muscovite powder and calcium carbonate whiskers, wherein the fineness of the superfine muscovite powder is 1200 meshes, the length-diameter ratio of the calcium carbonate whiskers is 20:1, and the mass ratio of the superfine muscovite powder to the calcium carbonate whiskers is 1.5: 1.
The expanding agent is a magnesium oxide expanding agent, the calcining temperature of the magnesium oxide expanding agent is 1150 ℃, and the content of magnesium oxide is 85%.
The polymer fiber is polypropylene fiber or polyvinyl alcohol fiber, the length of the polymer fiber is 6mm, and the diameter of the polymer fiber is 20 mu m.
The retarder is sodium gluconate; the defoaming agent is a polyether defoaming agent.
The rapid hardening sulphoaluminate cement is marked by 42.5; the gypsum powder is semi-hydrated fiber gypsum powder; the powder water reducing agent is a polycarboxylic acid powder water reducing agent, and the water reducing rate is 25%; the sand is river sand, the maximum particle size is less than 2.38mm, the fineness modulus is 2.5, and the grading curve is a zone II.
A preparation method of polymer mortar comprises the following steps:
step 1: uniformly mixing quick-hardening sulphoaluminate cement, gypsum powder, an expanding agent, sand, a powder water reducing agent, polymer fibers, a retarder and a hardening accelerator (0 part of the hardening accelerator in example 1) in raw material components to prepare a dry powder material;
step 2: adding superfine powder in the raw material components into the polymer emulsion and uniformly mixing to prepare pre-dispersed emulsion;
and step 3: and putting the dry powder, the pre-dispersed emulsion, the water and the defoaming agent into a stirrer, and mixing and stirring for 1-3 minutes to be uniform to prepare the polymer mortar.
Example 2 (simulated ambient temperature 20 ℃):
different from the embodiment 1, 95 parts of quick hardening sulphoaluminate cement, 40 parts of polymer emulsion, 2.5 parts of superfine powder, 10 parts of gypsum powder, 8 parts of expanding agent, 200 parts of sand, 35 parts of water, 0.8 part of powder water reducing agent, 0.8 part of polymer fiber, 0.02 part of hardening accelerator, 0.01 part of retarder and 0.5 part of defoaming agent, and other conditions are not changed.
Example 3 (simulated ambient temperature 5 ℃):
different from the embodiment 1, the quick hardening sulphoaluminate cement is 100 parts, the polymer emulsion is 35 parts, the superfine powder is 3 parts, the gypsum powder is 10 parts, the expanding agent is 5 parts, the sand is 210 parts, the water is 40 parts, the powder water reducing agent is 0.5 part, the polymer fiber is 1.0 part, the hardening accelerator is 0.05 part, the retarder is 0 part and the defoaming agent is 0.8 part, and other conditions are not changed.
The performance tests of the polymer mortars prepared from examples 1 to 3 each included two test phases, the first: the newly prepared polymer mortar (i.e., the polymer mortar before hardening) is shown in tables 1, 3 and 5 (it should be noted that t in tables 1, 3 and 5280The time required for the polymer mortar to reach the extension degree of 280 mm); second stage, hardened polymer mortar, see tables 2, 4 and 6.
TABLE 1 Performance results for the newly prepared polymer mortar of example 1
TABLE 2 Performance results of the hardened polymer mortar of example 1
TABLE 3 Performance results for the newly prepared polymer mortar of example 2
Table 4 performance results of the polymer mortar after hardening of example 2
TABLE 5 Performance results for the newly prepared polymer mortar of example 3
TABLE 6 Performance results of the hardened polymer mortar of example 3
In examples 1-6, the technical requirements defined by the performance test of the hardened polymer mortar are derived from Q/CR 659-.
As shown in the data in tables 1 to 6, the polymer mortar prepared in the embodiments 1 to 3 can meet the construction requirements of the CRTS II slab ballastless track filling layer and the mortar performance standard in the current ballastless track maintenance process under the conditions of different simulated environment temperatures of 35 ℃, 20 ℃ and 5 ℃, and the construction efficiency and the engineering quality are effectively ensured.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. The polymer mortar is characterized by comprising the following raw material components in parts by weight: 90-100 parts of quick-hardening sulphoaluminate cement, 35-45 parts of polymer emulsion, 2-3 parts of superfine powder, 5-10 parts of gypsum powder, 5-10 parts of expanding agent, 190-210 parts of sand, 30-40 parts of water, 0.5-1.0 part of powder water reducing agent, 0.5-1.0 part of polymer fiber, 0-0.05 part of hardening accelerator, 0-0.05 part of retarder and 0.3-0.8 part of defoaming agent;
the viscosity of the polymer emulsion is 50-1000 mPa.s, the solid content is 40-50%, and the lowest film-forming temperature is not more than 10 ℃;
the superfine powder is a mixture of superfine muscovite powder and calcium carbonate whiskers, wherein the fineness of the superfine muscovite powder is 1200-1350 meshes, the length-diameter ratio of the calcium carbonate whiskers is 20:1-30:1, and the mass ratio of the superfine muscovite powder to the calcium carbonate whiskers is 1:1-1.5: 1;
the gypsum powder is semi-hydrated fiber gypsum powder.
2. The polymer mortar of claim 1, wherein the polymer emulsion comprises at least one of a styrene-acrylic emulsion, a styrene-butadiene emulsion, a polyacrylate emulsion, and a neoprene latex emulsion.
3. The polymer mortar of claim 2, wherein the expanding agent is a magnesia expanding agent having a calcination temperature of 1050 ℃ to 1150 ℃, wherein the magnesia content is not less than 85%.
4. Polymer mortar according to claim 3, characterized in that the polymer fibres are polypropylene fibres or polyvinyl alcohol fibres, the polymer fibres having a length of 5mm-9mm and a diameter of 20 μm-40 μm.
5. The polymer mortar of claim 4, wherein the hardening enhancer comprises at least one of lithium carbonate and lithium chloride; the retarder comprises one of sodium gluconate, borax and tartaric acid; the defoaming agent comprises at least one of polyether defoaming agent, alcohol defoaming agent and fatty acid defoaming agent.
6. Polymer mortar according to claim 5, wherein the rapid hardening sulphoaluminate cement has a designation of 42.5 and above; the powder water reducing agent is a polycarboxylic acid powder water reducing agent, and the water reducing rate is 25-30%; the sand is machine-made sand or river sand, the maximum particle size is less than 2.38mm, the fineness modulus is 2.4-2.7, and the grading curve is a zone II.
7. A process for preparing a polymer mortar according to any one of claims 1 to 6, comprising the following steps:
step 1: uniformly mixing quick-hardening sulphoaluminate cement, gypsum powder, an expanding agent, sand, a powder water reducing agent, polymer fibers, a retarder and a hardening accelerator in raw material components to prepare a dry powder material;
step 2: adding superfine powder in the raw material components into the polymer emulsion and uniformly mixing to prepare pre-dispersed emulsion;
and step 3: and putting the dry powder, the pre-dispersed emulsion, the water and the defoaming agent into a stirrer, and mixing and stirring for 1-3 minutes to be uniform to prepare the polymer mortar.
8. The method of claim 7, wherein the polymer mortar produced is adapted to an ambient temperature of 5 ℃ to 35 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010522481.8A CN111620655B (en) | 2020-06-10 | 2020-06-10 | Polymer mortar and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010522481.8A CN111620655B (en) | 2020-06-10 | 2020-06-10 | Polymer mortar and preparation method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111620655A CN111620655A (en) | 2020-09-04 |
| CN111620655B true CN111620655B (en) | 2022-02-01 |
Family
ID=72270355
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010522481.8A Active CN111620655B (en) | 2020-06-10 | 2020-06-10 | Polymer mortar and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111620655B (en) |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6223820B2 (en) * | 2013-12-28 | 2017-11-01 | 太平洋マテリアル株式会社 | Polymer cement grout mortar |
| CN104030644B (en) * | 2014-06-09 | 2016-04-27 | 中国铁道科学研究院铁道建筑研究所 | A kind of polymer cement mortar for high-speed railway plate type ballastless track filling bed |
| CN107417151B (en) * | 2017-08-30 | 2018-08-31 | 广州市东浦建材有限公司 | A kind of modified micaceous powder of mortar |
| CN109626897A (en) * | 2018-12-11 | 2019-04-16 | 中国铁道科学研究院集团有限公司铁道建筑研究所 | A kind of injecting paste material and its technique for the regulation of ballastless track of high-speed railway roadbed grout |
-
2020
- 2020-06-10 CN CN202010522481.8A patent/CN111620655B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN111620655A (en) | 2020-09-04 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106517957B (en) | A kind of regular tenacity high elastic modulus concrete and preparation method thereof | |
| CN111533517B (en) | Rapid repair mortar for high-speed railway concrete track slab and preparation method thereof | |
| WO2017067411A1 (en) | Self-compacting concrete for use as crts iii slab ballastless railway track filler layer and method for preparation thereof | |
| CN109704695B (en) | Early-strength cast-in-situ reactive powder concrete and preparation method thereof | |
| CN112694299A (en) | High-crack-resistance concrete for plateau environment and preparation method thereof | |
| CN103803918A (en) | Porcelain powder waste mixed cement-based tiny-expansion crack repairing mortar and using method thereof | |
| CN110627445B (en) | High-impermeability cement-based repair material for tunnel engineering and preparation method thereof | |
| CN111574164A (en) | Rapid repairing material for super-early-strength shrinkage compensation road bridge and preparation method thereof | |
| CN115385624B (en) | Concrete containing recycled aggregate and preparation method and application thereof | |
| CN105016671A (en) | Superfluid self-compacting concrete and preparing method thereof | |
| CN110981375A (en) | Shrinkage-compensating rapid repairing material for bridge expansion joint | |
| CN111848035A (en) | Grouting material for connecting reinforcing steel bar sleeve and preparation method and application thereof | |
| CN108863148B (en) | Self-compacting concrete viscosity modifier | |
| CN111620655B (en) | Polymer mortar and preparation method thereof | |
| CN111848066A (en) | Rapid road repairing mortar and construction process thereof | |
| CN111362646B (en) | Low-elastic-modulus flexible ultrahigh-toughness mortar concrete system and preparation method thereof | |
| CN116514483A (en) | Self-compacting high-toughness semi-flexible pavement grouting material and preparation method thereof | |
| CN115849811A (en) | High-stability self-compacting concrete and preparation method thereof | |
| CN115321924A (en) | Durable self-compacting filling concrete material for underground structural engineering | |
| CN115057679A (en) | Special 100MPa non-shrinkage base slurry for wind power steel-concrete tower and preparation method thereof | |
| CN114790104A (en) | Concrete for repairing bridge expansion joint and preparation method and use method thereof | |
| CN110304860B (en) | Concrete flexibilizer and concrete | |
| CN113998954A (en) | Modified composite superfine powder pavement concrete, preparation method and application | |
| CN113248202A (en) | Cement-based recycled concrete | |
| CN112174562A (en) | Multifunctional admixture composition special for high-strength concrete and preparation method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |