CN110845204A - Polymer repair mortar used under low-temperature condition, and preparation method and construction method thereof - Google Patents
Polymer repair mortar used under low-temperature condition, and preparation method and construction method thereof Download PDFInfo
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- CN110845204A CN110845204A CN201910754590.XA CN201910754590A CN110845204A CN 110845204 A CN110845204 A CN 110845204A CN 201910754590 A CN201910754590 A CN 201910754590A CN 110845204 A CN110845204 A CN 110845204A
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- reducing agent
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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
- 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
- C04B28/02—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 hydraulic cements other than calcium sulfates
- C04B28/06—Aluminous cements
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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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/72—Repairing or restoring existing buildings or building materials
-
- 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
- C04B2111/766—Low temperatures, but above 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
- C04B2201/05—Materials having an early high strength, e.g. allowing fast demoulding or formless casting
-
- 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
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention relates to polymer repair mortar used under low temperature condition, which comprises the following components by mass percent: 40-55% of inorganic cementing material, 0.4-2.6% of organic cementing material, 43-55% of fine-grade sand, 0.2-0.5% of water reducing agent, 0.1-0.25% of water retention thickening agent, 0.05-0.25% of coagulant, 0.05-0.4% of defoaming agent and 0.25-1.5% of shrinkage reducing agent. According to the invention, the organic cementing material is added into the raw materials, so that the bonding effect of the mortar to the concrete is increased; the water reducing agent is added, so that the water consumption is effectively reduced, the strength is improved, the workability and the constructability of the mortar are improved by adding the water-retaining thickening material, the early hydration is promoted by adding the coagulant, the early strength is improved, the generation of bubble bags is reduced by adding the defoaming agent, and the volume stability of the mortar is effectively improved by adding the shrinkage reducing agent.
Description
Technical Field
The invention belongs to the technical field of concrete pavement repairing materials, and particularly relates to polymer repairing mortar used under a low-temperature condition, and a preparation method and a construction method thereof.
Background
The concrete surface layer is abraded, cracked and dropped due to long-term use, the surface needs to be maintained, the service life is prolonged, and the use cost is reduced. In order to ensure smooth traffic, the repair of concrete pavements needs to be rapid, and the repair materials are increasing day by day. For example, patent CN101830684B discloses a super early strength polymer rapid repair mortar material, the 3h compressive strength of the material is greater than 25MPa, the 1d flexural strength is greater than 10MPa, and the 1d compressive strength is greater than 50 MPa. At present, the rapid repair mortar applied to low temperature mainly adopts a ternary system of silicate cement-aluminate cement-gypsum. Although the existing repair materials are various, the repair mortar material in the prior art has the disadvantages of low index, poor volume stability, poor water resistance and poor bonding performance with a base layer, is mainly used for repairing concrete at normal temperature, and has little consideration for repairing concrete at low temperature/in winter. Therefore, under the condition of low temperature, the strength, the volume stability and the water resistance of the repair mortar are improved, the bonding with the base layer is enhanced, the peeling from the base layer is eliminated, and new requirements are provided for the use of the repair mortar. The concrete can be used for repairing engineering of old concrete, and is particularly suitable for realizing traffic within 10 hours during low-temperature/winter construction, such as rush-repair engineering of concrete bridge floors, pavements, airport runways and the like.
Disclosure of Invention
Aiming at the problems in the prior art, the invention aims to provide the polymer repair mortar suitable for the condition of 5-10 ℃, the preparation method and the construction method, the polymer repair mortar has simple components, high hourly strength and stable later strength development in a low-temperature environment, strong bonding with base layer concrete, good volume stability and strong water resistance, and is suitable for low-temperature/winter construction.
The invention is realized by the following technical scheme:
the polymer repair mortar for the low-temperature condition is characterized by comprising the following components in percentage by mass: 40-55% of inorganic cementing material, 0.4-2.6% of organic cementing material, 43-55% of fine-grade sand, 0.2-0.5% of water reducing agent, 0.1-0.25% of water-retaining thickening agent, 0.05-0.25% of coagulant, 0.05-0.4% of defoaming agent and 0.25-1.5% of shrinkage reducing agent, wherein the cementing material is redispersible latex powder, the water-retaining thickening agent is hydroxypropyl methyl cellulose, and the viscosity of the hydroxypropyl methyl cellulose is 6000 m.Pa.s.
The polymer repair mortar for the low-temperature condition is characterized by comprising 48% of an inorganic cementing material, 1.3% of an organic cementing material, 49% of fine-grade sand, 0.4% of a water reducing agent, 0.1% of a water-retaining thickening agent, 0.1% of a coagulant, 0.1% of a defoaming agent and 1.0% of a shrinkage reducing agent, wherein the cementing material is redispersible latex powder, the water-retaining thickening agent is hydroxypropyl methyl cellulose, and the viscosity of the hydroxypropyl methyl cellulose is 400 m.Pa.s.
The polymer repair mortar for low temperature is characterized in that the inorganic cementing material is high belite sulphoaluminate cement; the water reducing agent is a polycarboxylic acid water reducing agent; the coagulant is lithium carbonate or lithium sulfate; the defoaming agent is an organic silicon defoaming agent, a mineral oil defoaming agent or a polyether defoaming agent; the shrinkage reducing agent is polyalcohol or pentanediol shrinkage reducing agent.
The polymer repair mortar for low temperature is characterized in that the selected graded sand is river sand or quartz sand, and the particle size is 0.16-1.25 mm.
The polymer repair mortar for low-temperature conditions is characterized in that the selected graded sand consists of 40-70 meshes of quartz sand and 70-100 meshes of quartz sand.
The preparation method of the polymer repair mortar used under the low-temperature condition is characterized by comprising the following steps:
1) screening out quartz sand of 40-70 meshes and quartz sand of 70-100 meshes, and conveying the yarn to a sand material warehouse by adopting conveying equipment;
2) respectively putting the inorganic cementing material, the organic cementing material, the water reducing agent, the water retention thickening agent, the coagulant, the defoaming agent and the shrinkage reducing agent into corresponding bins for storage;
3) accurately metering and batching;
4) putting the raw materials metered in the step 3) and the quartz sand screened in the step 1) into a double gravity-free mixer for stirring, and performing opposite operation by adopting double horizontal shafts to uniformly stir to prepare finished mortar;
5) and (3) conveying the finished product mortar prepared in the step 4) into a finished product bin for product packaging or bulk loading.
The construction method of the polymer repair mortar used under the low-temperature condition is characterized by comprising the following steps:
1) cleaning the concrete ground, and sprinkling water for wetting;
2) when 3 parts of stones are paved on the concrete base layer, the paving height is only about 2-3cm away from the finished surface, and the paving surface is as flat as possible so as to ensure the flatness of the finally poured ground;
3) pouring the stirred super early strength polymer repair mortar at the position where the stones are paved in advance; when the mortar slurry permeates into the gaps of the stones, continuously pouring the slurry until the slurry completely covers the stones;
4) when pouring the ultra-early-strength polymer repair mortar, in order to ensure the integrity of the whole ground, a continuous operation mode is adopted so as to avoid influencing the construction;
5) and (5) when the surface of the slurry begins to be initially set, finishing and leveling.
According to the invention, the organic cementing material is added into the raw materials, so that the bonding effect of the mortar to the concrete is increased; the water reducing agent is added, so that the water consumption is effectively reduced, the strength is improved, the workability and the constructability of the mortar are improved by adding the water-retaining thickening material, the early hydration is promoted by adding the coagulant, the early strength is improved, the generation of bubble bags is reduced by adding the defoaming agent, and the volume stability of the mortar is effectively improved by adding the shrinkage reducing agent.
Detailed Description
The present invention will be described in further detail with reference to specific examples.
The invention accurately measures selected raw materials according to a specified range, and the raw materials comprise inorganic gelled materials, organic gelled materials, selected quartz sand, water reducing agents, water retention thickening materials, coagulants, antifoaming agents and shrinkage reducing agents, and are mixed according to a scientific formula, so that the finished mortar has the characteristics of high early strength and continuous increase of later strength under a low-temperature condition, excellent water retention property, high cohesiveness, good flexibility and the like. The product can be transported to a construction site in a packaging or bulk form, water is added according to a specified proportion, the mixture is stirred according to a given stirring system, and the mixture can be used after being uniformly stirred.
Example 1
48% of inorganic cementing material, high belite sulphoaluminate cement; organic cementing material, re-dispersible latex powder, 1.3%, EVA component glue powder, such as Vinnapas 5010N of Wake; 40-70 mesh quartz sand, 20 percent, 70-100 mesh quartz sand, 29 percent; 0.4 percent of polycarboxylic acid water reducing agent; water-retaining thickener, hydroxypropyl methylcellulose, viscosity 400m.Pa.s, 0.1%; 0.1% of lithium carbonate; 0.1% of organic silicon defoaming agent; 1.0% of pentanediol shrinkage reducing agent.
Example 2
47% of inorganic cementing material, high belite sulphoaluminate cement; organic cementing material, re-dispersible latex powder, 0.57%, EVA component glue powder, such as Vinnapas 5010N of Wake; 40-70 meshes of quartz sand, 25 percent of quartz sand, 70-100 meshes of quartz sand, 25 percent of quartz sand; 0.3 percent of polycarboxylic acid water reducing agent; water-retaining thickener, hydroxypropyl methylcellulose, viscosity 400m.Pa.s, 0.1%; 0.15% of lithium carbonate; 0.08 percent of organic silicon defoaming agent; 0.8 percent of pentanediol shrinkage reducing agent.
Example 3
53% of inorganic cementing material, high belite sulphoaluminate cement; 1.1 percent of organic cementing material and redispersible latex powder; 40-70 mesh quartz sand, 22.5%, 70-100 mesh quartz sand, 22.5%; 0.2 percent of polycarboxylic acid water reducing agent; a water-retaining thickener with the viscosity of 100-6000m.Pa.s, 0.1%; 0.10% of lithium carbonate coagulant; 0.2 percent of organic silicon defoamer; 0.30 percent of pentanediol shrinkage reducing agent.
Comparative example 1
Inorganic cement, 43%; 0.1 percent of organic cementing material and redispersible latex powder;
70-100 mesh quartz sand, 56%; water-retaining thickener, HPMC with viscosity of 100000m.Pa.s, 0.15%; 0.1 percent of polycarboxylic acid water reducing agent; 0.65% of organic silicon defoamer.
Examples 1-3 and comparative example 1 a method for preparing a single-component high-fluidity ultra-early-strength polymer repair mortar comprises the following steps:
1) in the pretreatment process of the sand, quartz sand of 40-70 meshes and quartz sand of 70-100 meshes are screened out, and the sand is conveyed to a sand and stone material warehouse by adopting conveying equipment;
2) placing the inorganic cementing material, the organic cementing material, the water reducing agent, the water retention thickening material, the early strength agent, the defoaming agent and the shrinkage reducing agent into corresponding bins for storage;
3) accurately metering and batching;
4) the raw materials metered in the step 3) are put into a double gravity-free mixer for stirring, and the double horizontal shafts are adopted for opposite operation, so that the stirring is uniform, the use efficiency is high, and the damage is avoided;
5) and conveying the finished product mortar into a finished product bin for product packaging or bulk loading.
The work-up method of the single-component high-fluidity super early-strength polymer repair mortar prepared in the embodiment comprises the following steps: 1) cleaning the concrete ground, and sprinkling water for wetting; 2) when 3 parts of stones are paved on the concrete base layer, the paving height is only about 2-3cm away from the finished surface, and the paving surface is as flat as possible so as to ensure the flatness of the finally poured ground; 3) pouring the stirred super early strength polymer repair mortar at the position where the stones are paved in advance; when the mortar slurry permeates into the gaps of the stones, continuously pouring the slurry until the slurry completely covers the stones; 4) when pouring the ultra-early-strength polymer repair mortar, in order to ensure the integrity of the whole ground, a continuous operation mode is adopted so as to avoid influencing the construction; 5) and (5) when the surface of the slurry begins to be initially set, finishing and leveling.
Performance testing
The single-component high-fluidity ultra-early-strength polymer repair mortar prepared in examples 1 to 3 and comparative example 1 were tested for setting time, fluidity, 5h flexural strength, 5h compressive strength, 5h tensile bond strength, 28d flexural strength, 28d compressive strength, 28d tensile bond strength and shrinkage at low temperature according to the testing methods commonly used in the prior art, and the test results are shown in table 1.
TABLE 1
As can be seen from Table 1, in examples 1 to 3, it can be seen that the setting time of the mortar at low temperature is controlled within 100 minutes, the initial fluidity and the fluidity after 20 minutes are high, the fluidity loss is small, the flexural strength and the compressive strength are high, especially the early strength is rapidly developed, the later strength is stably increased, the tensile bonding strength is greater than 2.0MPa by adding the latex powder, and the micro-expansion effect is generated by adding the shrinkage reducing agent. The latex powder of comparative example 1 has low mixing amount, low tensile bonding strength and high viscosity of cellulose ether, so that the fluidity is low, the fluidity loss is large, no shrinkage reducing agent is added, and a sample generates large shrinkage at 28d, so that the volume stability is not facilitated, and the risk of cracking is caused.
Therefore, the ultra-early-strength polymer repair mortar used under the low-temperature condition has the advantages of simple components, low production cost, high strength and high tensile bonding strength, greatly improves the crack resistance and the water retention property of the mortar, widens the application range, and is particularly suitable for low-temperature or winter construction.
The above examples are only intended to illustrate the inventive concept of the present invention, and not to limit the scope of the claims of the present invention, and any insubstantial modifications of the invention using the above concepts are intended to fall within the scope of the present invention.
Claims (7)
1. The polymer repair mortar for the low-temperature condition is characterized by comprising the following components in percentage by mass: 40-55% of inorganic cementing material, 0.4-2.6% of organic cementing material, 43-55% of fine-grade sand, 0.2-0.5% of water reducing agent, 0.1-0.25% of water-retaining thickening agent, 0.05-0.25% of coagulant, 0.05-0.4% of defoaming agent and 0.25-1.5% of shrinkage reducing agent, wherein the cementing material is redispersible latex powder, the water-retaining thickening agent is hydroxypropyl methyl cellulose, and the viscosity of the hydroxypropyl methyl cellulose is 6000 m.Pa.s.
2. The polymer repair mortar for use under low temperature conditions of claim 1, wherein the inorganic cement is 48%, the organic cement is 1.3%, the selected grade sand is 49%, the water reducing agent is 0.4%, the water retention thickener is 0.1%, the accelerator is 0.1%, the defoamer is 0.1%, the shrinkage reducing agent is 1.0%, the cement is redispersible latex powder, the water retention thickener is hydroxypropyl methyl cellulose, and the viscosity of the hydroxypropyl methyl cellulose is 400 m.Pa.s.
3. The polymer repair mortar for use under low temperature conditions according to claim 1 or 2, characterized in that the inorganic cementitious material is a high belite sulphoaluminate cement; the water reducing agent is a polycarboxylic acid water reducing agent; the coagulant is lithium carbonate or lithium sulfate; the defoaming agent is an organic silicon defoaming agent, a mineral oil defoaming agent or a polyether defoaming agent; the shrinkage reducing agent is polyalcohol or pentanediol shrinkage reducing agent.
4. The polymer repair mortar for use under cryogenic conditions according to claim 1 or 2, characterized in that the fine grade of sand is river sand or quartz sand, with a particle size of 0.16 to 1.25 mm.
5. The polymer repair mortar for use under cryogenic conditions of claim 4, wherein the beneficiated graded sand is comprised of 40-70 mesh quartz sand and 70-100 quartz sand.
6. The method of claim 1 for preparing a polymer repair mortar for use under low temperature conditions, comprising the steps of:
1) screening out quartz sand of 40-70 meshes and quartz sand of 70-100 meshes, and conveying the yarn to a sand material warehouse by adopting conveying equipment;
2) respectively putting the inorganic cementing material, the organic cementing material, the water reducing agent, the water retention thickening agent, the coagulant, the defoaming agent and the shrinkage reducing agent into corresponding bins for storage;
3) accurately metering and batching;
4) putting the raw materials metered in the step 3) and the quartz sand screened in the step 1) into a double gravity-free mixer for stirring, and performing opposite operation by adopting double horizontal shafts to uniformly stir to prepare finished mortar;
5) and (3) conveying the finished product mortar prepared in the step 4) into a finished product bin for product packaging or bulk loading.
7. The method of constructing a polymer repair mortar for use under low temperature conditions according to claim 1, comprising the steps of:
1) cleaning the concrete ground, and sprinkling water for wetting;
2) when 3 parts of stones are paved on the concrete base layer, the paving height is only about 2-3cm away from the finished surface, and the paving surface is as flat as possible so as to ensure the flatness of the finally poured ground;
3) pouring the stirred super early strength polymer repair mortar at the position where the stones are paved in advance; when the mortar slurry permeates into the gaps of the stones, continuously pouring the slurry until the slurry completely covers the stones;
4) when pouring the ultra-early-strength polymer repair mortar, in order to ensure the integrity of the whole ground, a continuous operation mode is adopted so as to avoid influencing the construction;
5) and (5) when the surface of the slurry begins to be initially set, finishing and leveling.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111423193A (en) * | 2020-03-20 | 2020-07-17 | 浙江忠信新型建材股份有限公司 | Quick-hardening polymer cement waterproof mortar with low water absorption and preparation method thereof |
| CN114890711A (en) * | 2022-04-27 | 2022-08-12 | 吴为群 | Ground leveling system composition material and matched construction process |
| CN115215606A (en) * | 2022-05-10 | 2022-10-21 | 君旺节能科技股份有限公司 | Mortar suitable for negative temperature environment and preparation method thereof |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111423193A (en) * | 2020-03-20 | 2020-07-17 | 浙江忠信新型建材股份有限公司 | Quick-hardening polymer cement waterproof mortar with low water absorption and preparation method thereof |
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| CN115215606A (en) * | 2022-05-10 | 2022-10-21 | 君旺节能科技股份有限公司 | Mortar suitable for negative temperature environment and preparation method thereof |
| CN115215606B (en) * | 2022-05-10 | 2023-06-16 | 君旺节能科技股份有限公司 | Mortar suitable for negative temperature environment and preparation method thereof |
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