CN117843326A - Cement composite-based rapid repair material in negative temperature environment and preparation method and application thereof - Google Patents
Cement composite-based rapid repair material in negative temperature environment and preparation method and application thereof Download PDFInfo
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- CN117843326A CN117843326A CN202311623131.0A CN202311623131A CN117843326A CN 117843326 A CN117843326 A CN 117843326A CN 202311623131 A CN202311623131 A CN 202311623131A CN 117843326 A CN117843326 A CN 117843326A
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- 239000000292 calcium oxide Substances 0.000 claims description 6
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims description 6
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- 229920003088 hydroxypropyl methyl cellulose Polymers 0.000 claims description 6
- 235000010979 hydroxypropyl methyl cellulose Nutrition 0.000 claims description 6
- UFVKGYZPFZQRLF-UHFFFAOYSA-N hydroxypropyl methyl cellulose Chemical compound OC1C(O)C(OC)OC(CO)C1OC1C(O)C(O)C(OC2C(C(O)C(OC3C(C(O)C(O)C(CO)O3)O)C(CO)O2)O)C(CO)O1 UFVKGYZPFZQRLF-UHFFFAOYSA-N 0.000 claims description 6
- 239000000395 magnesium oxide Substances 0.000 claims description 6
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims description 6
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 claims description 6
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- 230000008014 freezing Effects 0.000 description 7
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- MKRNVBXERAPZOP-UHFFFAOYSA-N Starch acetate Chemical compound O1C(CO)C(OC)C(O)C(O)C1OCC1C(OC2C(C(O)C(OC)C(CO)O2)OC(C)=O)C(O)C(O)C(OC2C(OC(C)C(O)C2O)CO)O1 MKRNVBXERAPZOP-UHFFFAOYSA-N 0.000 description 6
- CADZRPOVAQTAME-UHFFFAOYSA-L calcium;hydroxy phosphate Chemical compound [Ca+2].OOP([O-])([O-])=O CADZRPOVAQTAME-UHFFFAOYSA-L 0.000 description 6
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- WMFOQBRAJBCJND-UHFFFAOYSA-M Lithium hydroxide Chemical compound [Li+].[OH-] WMFOQBRAJBCJND-UHFFFAOYSA-M 0.000 description 2
- 239000011384 asphalt concrete Substances 0.000 description 2
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Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention provides a cement composite-based rapid repair material in a negative temperature environment, and a preparation method and application thereof, belonging to the technical field of road repair materials, and comprising the following steps: 35-45% of mixed cement and 55-65% of auxiliary materials; wherein, the mixed cement comprises quick hardening sulphoaluminate cement and ordinary silicate cement; the auxiliary materials comprise silica fume, quartz sand, polypropylene fibers, rubber powder, carbon black, a water reducing agent, lithium carbonate, a defoaming agent, a water retaining agent, an expanding agent, nano silicon dioxide and sodium nitrite. The rapid repairing material has the advantages of high coagulation speed, good compatibility and cohesiveness with the base material, no heating maintenance, rapid early strength development, stable and increased later strength, good construction performance and excellent durability, is suitable for rapid repairing of bridge deck/expansion joints at normal temperature and negative temperature, and can meet the requirements of rapid repairing and traffic for 2 hours at normal temperature and negative temperature.
Description
Technical Field
The invention relates to the technical field of road repair materials, in particular to a cement composite-based rapid repair material in a negative temperature environment, and a preparation method and application thereof.
Background
Asphalt concrete is mostly adopted in road bridge deck pavement layers in China, the tensile deformation capacity of the asphalt concrete is poor, and the concrete pavement layers can be cracked and damaged to different degrees under the comprehensive actions of factors such as temperature difference, shrinkage, vehicle load and the like. On one hand, harmful ions in rainwater can be caused to infiltrate into the lower structures such as reinforced concrete main beams of the bridge through cracks to influence the service life of the bridge; on the other hand, the driving comfort and the appearance of the road deck are seriously affected. Similarly, if concrete on two sides of the bridge expansion joint is impacted, stress concentration is easy to generate to cause damage, and the main form of expansion joint damage comprises damage to concrete on two sides of the expansion joint and bonding failure between the concrete and steel plates and old concrete, so that further damage such as exposure of the steel plates of the expansion joint and steel bar breakage and the like can be caused, and finally, poor connection between a road surface and a bridge deck is caused, early damage is generated, and traffic operation is influenced. Therefore, how to repair the concrete structure at the road and bridge deck and/or the expansion joint, and to prolong the service life and service quality of the concrete structure are one of the most important problems faced in the current public transportation field.
To solve the above problems, at present, cement-based materials are generally adopted for repairing, and with the rapid development of economy and the acceleration of life pace, the time-efficiency requirement on the repairing engineering of a concrete structure is higher and higher, the time requirement on traffic opening is shorter and the durability requirement on the repairing materials is higher and higher. At present, the research of the rapid repair material is mainly focused on the normal temperature environment, but the winter temperature is below zero in more than 60% of areas in China, and the negative temperature construction time is as long as 4 months, so that the defects of rapid pavement repair are more prominent and difficult to overcome when the construction cost and difficulty are greatly increased due to the cold climate environment after entering the winter construction period. When the existing cement-based repairing material is used, the following defects and shortcomings exist:
1. expansion joint maintenance and bridge deck pavement maintenance belong to maintenance engineering, and traffic needs to be closed, so that the road traffic rate is reduced, and the loss caused by the reduction is more serious for highways. The conventional cement concrete material has longer maintenance period, long road closing time, particularly in winter environment, the pavement contacted in the construction process is in a negative temperature state, the hydration activity of the cement-based repair material is obviously reduced, and the setting and hardening are slow, so that the strength development is slow, the final strength is low, the shrinkage is large, and the requirements of repairing and repairing engineering for repairing and recovering traffic rapidly in winter cannot be met.
2. The repaired concrete material is easy to cause secondary damage under the impact load effect due to higher modulus. In addition, the adhesiveness of the current repair material with the original road surface and the expansion joint has a certain problem, so that the repair material is easy to fall off, and the driving safety is affected.
3. The shrinkage and thermal shrinkage of cement-based repair materials are one of the main causes of early cracks. Because the humidity of the external environment is reduced and the water consumption rate generated by the hydration of the cement is higher than the external water migration rate, negative pressure is generated in capillary holes to form shrinkage, and finally cracks are formed and harmful substances invade, so that the durability of the concrete is seriously affected. The conventional repairing material is a cement-based material, and the problems of dry shrinkage and thermal shrinkage exist.
At present, the engineering construction under the negative temperature environment mainly adopts methods of raw material preheating, auxiliary heat preservation, heating maintenance and the like to improve the material temperature so as to ensure the normal hydration of cement. When the rush repair and rush construction work is carried out in a negative temperature environment, the method is tedious and time-consuming, so that the development of the cement-based rapid repair material capable of normally hydration hardening in the negative temperature environment has important significance.
Disclosure of Invention
The invention provides the cement composite-based rapid repair material which has the advantages of high coagulation speed, good compatibility and cohesiveness with a base material, no heating maintenance, good construction performance and excellent durability, is suitable for rapid repair of bridge decks/expansion joints at normal temperature and under negative temperature, and can meet the requirements of rapid repair for 2 hours under the negative temperature environment and the traffic environment at normal temperature and under the negative temperature environment, and the preparation method and the application thereof.
In order to achieve the above object, the present invention provides a cement composite-based rapid repair material in a negative temperature environment, comprising: 35-45% of mixed cement and 55-65% of auxiliary materials; wherein, the mixed cement includes: 350-400 parts by weight of quick hardening sulphoaluminate cement and 18-28 parts by weight of ordinary silicate cement; the auxiliary materials comprise: 20 to 33 parts by weight of silica fume, 520 to 580 parts by weight of quartz sand, 1 to 3 parts by weight of polypropylene fiber, 15 to 25 parts by weight of rubber powder, 0.5 to 2.0 parts by weight of carbon black, 2 to 4 parts by weight of water reducing agent, 0.2 to 1.5 parts by weight of lithium carbonate, 0.5 to 1.0 part by weight of defoamer, 0.3 to 1.5 parts by weight of water retaining agent, 0.1 to 0.8 part by weight of expanding agent, 0.2 to 1.0 part by weight of nano silicon dioxide and 0.5 to 3.5 parts by weight of sodium nitrite.
The rapid repair material provided by the invention has the advantages that the early strength of the material is provided by a rapid hardening sulphoaluminate cement, ordinary silicate cement and silica fume multielement system, the workability and ductility of the material are improved by utilizing other auxiliary materials, the flowability and cohesion strength of the material are improved, the deformability of the material is improved, the elastic modulus is reduced, meanwhile, the mixed cement and the auxiliary materials can form a good space structure, the superior durability is provided, the construction time of the material meets the requirements of the highway cement concrete pavement maintenance technical specification, and the requirements of 2h rapid repair and traffic can be met under normal temperature and negative temperature environments (particularly suitable for the environmental conditions of minus 5 ℃ to minus 10 ℃).
According to the present invention, a rapid repair material includes: 37-42% of mixed cement and 58-63% of auxiliary materials; wherein, the mixed cement includes: 355-385 parts by weight of quick-hardening sulphoaluminate cement and 20-25 parts by weight of ordinary silicate cement; the auxiliary materials comprise: 25-30 parts of silica fume, 530-570 parts of quartz sand, 2-3 parts of polypropylene fiber, 15-20 parts of rubber powder, 0.5-1.5 parts of carbon black, 2.5-3.5 parts of water reducing agent, 0.4-1.0 parts of lithium carbonate, 0.3-1.0 parts of defoamer, 0.3-1.0 parts of water retaining agent, 0.1-1.0 parts of expanding agent, 0.2-0.5 parts of nano silicon dioxide and 0.8-2.8 parts of sodium nitrite.
Various auxiliary materials (such as nano silicon dioxide belonging to active nano materials, which can increase hydration heat release rate and is beneficial to the coagulation and hardening of the materials in a negative temperature environment) are added into the rapid repair material, so that cracking caused by heat release in the cement hydration process can be improved, the rapid repair material has higher crack resistance, the service life of the rapid repair material is prolonged, and the durability of the rapid repair material is improved; meanwhile, the material has the advantages of high coagulation speed, rapid strength increase, good compatibility and cohesiveness with the base material, and capability of generating higher cohesive strength in early stage and meeting the requirement of quick repair.
According to the invention, the rapid hardening sulphoaluminate cement is R.SAC42.5 or R.SAC52.5; the Portland cement is P.O.42.5 or P.O.52.5. The ordinary silicate cement is widely applied due to the advantages of reliable performance and low price, but has the problems of long curing time, slow early strength development, poor fluidity, low setting rate and the like, and the quick hardening sulphoaluminate cement not only has the advantages of quick setting and hardening, concentrated hydration heat release, high early strength and the like, but also has good low-temperature hydration and hardening performance, shows the potential of being used as a cementing component in a low-temperature or negative-temperature environment, effectively reduces the setting time of mixed cement by doping the ordinary silicate cement into the sulphoaluminate cement, realizes controllable setting time of a repairing material, also improves the strength of the mixed cement mortar in each period, particularly greatly improves the later strength, and meets the requirement of quick repairing.
According to the invention, the particle size of the quartz sand is classified into 10-20 meshes, 20-40 meshes and 70-140 meshes; wherein, the weight part of the quartz sand with 10 to 20 meshes is 360 to 375 parts, the weight part of the quartz sand with 20 to 40 meshes is 85 to 100 parts, and the weight part of the quartz sand with 70 to 140 meshes is 85 to 95 parts. The more reasonable the gradation among different particle sizes of quartz sand, the denser the structure of the quick repair material, and as well, the adoption of the cooperation of quartz sand particles with different particle sizes and silica fume can improve the compactness of the microstructure of the quick repair material, improve the compactness of the repair concrete, be favorable for the occlusion and the cohesive force between new and old materials, and improve the mechanical property and the durability of the repaired concrete.
According to the invention, the rubber powder is at least one of ethylene-vinyl acetate copolymer rubber powder, acrylic polymer rubber powder, polyethylene oxide rubber powder, styrene-acrylic rubber powder and styrene-butadiene rubber powder.
Preferably, the gum is an ethylene-vinyl acetate copolymer gum.
According to the invention, the specific surface area of the silica fume is 20000m 2 /kg。
According to the invention, the water reducing agent is a polycarboxylic acid high-efficiency water reducing agent. The polycarboxylic acid high-efficiency water reducer can be used for dispersing cement particles, and has a good steric hindrance effect, so that the rapid repair material has optimal construction performance.
According to the invention, the length specification of the polypropylene fibers is 3mm, 6mm or 9mm.
Preferably, the polypropylene fibers have a length of 6mm. The anti-cracking performance of the rapid repair material can be improved by doping the polypropylene fiber.
According to the invention, the water-retaining agent is compounded by hydroxypropyl methyl cellulose and water-absorbing resin according to the weight ratio of (0.5-1.5): 1.
Preferably, the hydroxypropyl methylcellulose and the water-absorbent resin are compounded in a weight ratio of 1:1. The presence of the hydroxypropyl methylcellulose and the water-absorbent resin can provide internal curing water for the rapid repair material during repair, maintain the relative humidity of the interior of the cement-based material, and facilitate the alleviation of early self-shrinkage of the rapid repair material and the compensation of rapid shrinkage of concrete, thereby reducing crack formation after repair and enhancing durability.
According to the invention, the expanding agent is compounded by calcium oxide expanding agent and magnesium oxide expanding agent according to the weight ratio of 1 (0.5-1.5).
Preferably, the calcium oxide expanding agent and the magnesium oxide expanding agent are compounded according to a weight ratio of 1:1. The rapid reaction between the calcium oxide expanding agent and water can compensate early shrinkage, and the delayed expansion of the magnesium oxide expanding agent is suitable for reducing later shrinkage, and the compounded expanding agent can effectively compensate the early shrinkage of the rapid repair material and reduce the cracking risk after use.
According to the invention, the weight ratio of the lithium carbonate to the sodium nitrite in the auxiliary materials is (0.4-0.6): 1. After the rapid repair material is used for repairing, li in the rapid repair material is + Strong alkali LiOH is formed, so that the alkalinity of cement hydration reaction is increased, and Al is accelerated 3+ Thereby promoting ettringite formation; li (Li) + The protective film formed in the cement hydration process can be destroyed to shorten the induction period, the early hydration degree of the rapid repair material is improved, and the dual function finally shortens the setting time of the mixed cement. The sodium nitrite can reduce the solidifying point of the liquid phase in the hydration reaction under the negative temperature environment, and enough liquid phase still exists under the negative temperature to ensure the continuous hydration of cement, so that the amount of the hydration product AFt is greatly increased, the hydration degree and the hydration rate are greatly improved, the hydration products are mutually overlapped to form a stable network structure, higher strength is obtained, and the quick repairing material can be normally coagulated and hardened; meanwhile, the formed cement stone pore structure can be improved, the number of macropores is reduced, the number of pores is increased (the pore diameter of cement stone without sodium nitrite is more than Kong Zhanliang percent of 500A, the pore occupation of the cement stone with sodium nitrite can be reduced to 47.36 percent), the ice content is also reduced, and the damage effect caused by liquid phase icing is weakened.
According to the invention, lithium carbonate and sodium nitrite with special proportions are added into the rapid repair material, and the two components are used for participating in hydration to ensure that sufficient liquid phase water exists in hydration reaction to the greatest extent, so that the hydration reaction is promoted, the early hydration of cement minerals can be mutually and synergistically improved, the setting and hardening speed of mixed cement in a negative temperature state is improved, the setting time is reduced, the early strength is improved, the cement composite base material is completely suitable for application in a negative temperature environment (particularly suitable for the environment condition of minus 5 ℃ to minus 10 ℃), and the engineering requirement of 2h traffic can be realized.
The invention also provides a preparation method of the cement composite-based rapid repair material in a negative temperature environment, which comprises the following steps:
1) Mixing quick hardening sulphoaluminate cement, ordinary portland cement, silica fume, quartz sand, polypropylene fiber, rubber powder, carbon black and a water reducing agent according to parts by weight, and stirring for 2-5 min at a speed of 120-300 r/min to obtain a component A;
2) Mixing lithium carbonate, a defoaming agent, a water-retaining agent, an expanding agent, nano silicon dioxide and sodium nitrite according to parts by weight, and stirring at a speed of 140-200 r/min for 2-5 min to obtain a component B;
3) Mixing the component A and the component B, uniformly stirring for 5-10 min at a speed of 100-200 r/min, uniformly mixing, and sealing in a moistureproof packaging bag to obtain the cement composite-based rapid repair material under the negative temperature environment.
According to the invention, the rapid repair material comprises: 350-400 parts by weight of quick-hardening sulphoaluminate cement, 18-28 parts by weight of ordinary portland cement, 20-33 parts by weight of silica fume, 520-580 parts by weight of quartz sand, 1-3 parts by weight of polypropylene fiber, 15-25 parts by weight of rubber powder, 0.5-2.0 parts by weight of carbon black, 2-4 parts by weight of water reducer, 0.2-1.5 parts by weight of lithium carbonate, 0.5-1.0 parts by weight of defoamer, 0.3-1.5 parts by weight of water retention agent, 0.1-0.8 parts by weight of expanding agent, 0.2-1.0 parts by weight of nano silicon dioxide and 0.5-3.5 parts by weight of sodium nitrite.
The rapid repair material prepared by the invention can meet the use requirements in normal temperature and negative temperature environments by cooperatively controlling the hydration reaction process through the components, realizes direct mixing, pouring and heating-free maintenance in normal temperature and negative temperature environments, is suitable for rapid repair of road bridge decks/expansion joints in normal temperature and negative temperature environments, is particularly suitable for the environment conditions of minus 5 ℃ to minus 10 ℃, has rapid short-term strength improvement, does not influence construction in negative temperature, is suitable for rapid rush repair in negative temperature environments, and has repair construction time meeting the requirements of the technical specification of road cement concrete pavement maintenance, and can meet the requirements of rapid repair traffic in normal temperature and negative temperature environments.
In addition, the invention also provides application of the cement composite-based rapid repair material in repairing road and bridge surfaces and expansion joints in a negative temperature environment, wherein the rapid repair material is the cement composite-based rapid repair material in the negative temperature environment; the rapid repair material is free from heating and maintenance in a negative temperature environment, and the traffic is opened for 2 hours.
The rapid repair material can realize rapid setting and hardening and heating-free maintenance in normal temperature and negative temperature environments, is particularly suitable for the environmental conditions of minus 5 ℃ to minus 10 ℃, has rapid early strength development, stable and increased later strength, good interface cohesiveness and fatigue resistance, can be used for traffic in a short time, has low shrinkage rate, is not easy to crack, has good durability, reduces maintenance cost, and is more suitable for practical use.
The cement composite-based rapid repair material provided by the invention can keep short setting time under normal temperature and negative temperature environment, is especially suitable for the environment condition of-5 to-10 ℃, has fast early strength development, stably increases later strength, has good volume stability, has the shrinkage rate of not more than 0.02% in 28 days, and has good crack resistance, impermeability and waterproof performance;
when the rapid repair material is applied to repairing road and bridge surfaces and expansion joints, construction is simple and rapid, special heat preservation measures are not needed even in winter construction, heating-free maintenance can be realized, high mechanical property development can be kept in a negative temperature environment, and the rapid repair material can be used for repairing the road and bridge surfaces for 2 hours and then can be used for traffic, so that the open traffic time is greatly shortened, the practicability is good, the damage resistance of the road and bridge surfaces and the expansion joints is effectively improved, and the service life of the rapid repair material is prolonged.
The rapid repairing material disclosed by the invention realizes self-compaction molding by utilizing the flowability and the ductility of the rapid repairing material through the combination, the proportioning and the synergistic effect of various raw materials, has good bonding performance and synergistic stress performance with base materials (such as concrete, stone and metal), is low in shrinkage, does not crack, can be used for construction at negative temperature, is normally coagulated at negative temperature, is not influenced in strength increase, and is used for road repair without influencing engineering progress.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, the following description will briefly explain the drawings used in the embodiments or the description of the prior art, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a graph showing the relationship between the mass loss rate and the freeze-thaw cycle times of different rapid repair materials;
FIG. 2 is a graph showing the relationship between the compressive strength loss rate and the freeze-thaw cycle times of different rapid repair materials.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are also within the scope of the invention.
The following examples use instrumentation conventional in the art. The test materials, reagents, etc. used in the examples described below are commercially available in the specification conventional in the art unless otherwise specified. Those of skill or conditions not identified in the following examples may be performed according to the techniques or conditions described in the literature in this field or according to the product specifications.
In the present invention and the following examples, the concentration, the proportion, etc. not specifically described are weight concentration, the weight ratio, etc., and "%" all represent weight percentages, and "parts" all represent weight parts, which belong to the writing habit commonly used by those skilled in the art, so that the description thereof is omitted herein.
According to the invention, the use of the rapid repair material comprises the following steps:
(1) Drawing a boundary line on the surface to be repaired according to the damage range, and performing boundary cutting along the boundary line by using a cutting machine to form a pit slot with a specification geometric shape;
(2) Removing broken blocks and other sundries in the pit groove, and sprinkling water for wetting;
(3) Adding the cement composite base rapid repairing material into a stirrer, stirring for 45-60 s at the speed of 50-100 r/min, and uniformly dispersing; adding water accounting for 12-15% of the weight of the rapid repairing material, and stirring for 100-150 s at a speed of 150-200 r/min to obtain slurry;
(4) Pouring the slurry into the pit slot, vibrating, trowelling and curing without heating.
According to the invention, sand or sand stone can be added into the slurry in the step 3) to be uniformly stirred, so that mortar or concrete is formed to pour and repair the pit. The rapid repairing material has the characteristics of good fluidity, quick setting time, low elastic modulus, high early strength, high bonding strength and the like, can realize rapid grouting construction, is well stressed in cooperation with a base layer, is rapid and simple to construct, and is used for repairing roads without influencing engineering progress.
In order to further improve the performance of the rapid repair material, the rapid repair material further comprises: starch acetate 0.5-1 weight portions and calcium hydroxy phosphate 0.2-1.5 weight portions. Starch acetate and calcium hydroxy phosphate cooperate with other components to form a gel-like structure so as to fill the internal pores of the rapid repair material, improve the compactness and integrity of the material, so that the later strength development can be continuously provided, and simultaneously, capillary pores can be plugged and thinned and moisture is blocked, so that the rapid repair material can obviously reduce the flaking amount and the mass loss rate after freeze thawing while improving the compactness, and the freeze thawing resistance and the freezing resistance of the rapid repair material are obviously improved.
The defoaming agent in the auxiliary material is a powder defoaming agent commonly used in the field, and the water-absorbent resin is a water-absorbent resin commonly used in the field, and is not particularly limited and repeated.
In the examples, the water-absorbent resin was polyacrylamide resin, the defoamer was P803 powder defoamer, and the rubber powder was Wake chemical5010N, the strength grade of the quick hardening sulphoaluminate cement is 52.5, and the strength grade of the ordinary silicate cement is 42.5.
The present invention will be described in further detail with reference to examples. It is to be understood that the examples are for illustrative purposes only and are not intended to limit the scope of the present invention.
Example 1:
a preparation method of a cement composite-based rapid repair material in a negative temperature environment comprises the following steps:
1) Mixing 374.6 parts by weight of quick-hardening sulphoaluminate cement, 24 parts by weight of ordinary portland cement, 28 parts by weight of silica fume, 565 parts by weight of quartz sand (10-20 meshes 373 parts, 20-40 meshes 97 parts and 70-140 meshes 95 parts), 3 parts by weight of polypropylene fiber, 22.5 parts by weight of rubber powder, 0.5 part by weight of carbon black and 4 parts by weight of water reducer according to parts by weight, and stirring for 3min at a speed of 180r/min to obtain a component A;
2) Mixing 0.4 weight part of lithium carbonate, 0.8 weight part of defoaming agent, 1.2 weight parts of water-retaining agent, 0.8 weight part of expanding agent, 0.8 weight part of nano silicon dioxide and 2 weight parts of sodium nitrite according to weight parts, and stirring at a speed of 200r/min for 5min to obtain a component B;
3) Mixing the component A and the component B, stirring at a constant speed of 200r/min for 10min, and sealing in a moisture-proof packaging bag after uniform mixing, thus obtaining the rapid repair material.
The length of the polypropylene fiber is 9mm. The water-retaining agent is compounded by hydroxypropyl methyl cellulose and water-absorbing resin according to the weight ratio of 0.5:1. The expanding agent is compounded by calcium oxide expanding agent and magnesium oxide expanding agent according to the weight ratio of 1:1.5. The weight ratio of the lithium carbonate to the sodium nitrite in the auxiliary materials is 0.4:1.
Comparative example 1:
the preparation method of the cement composite-based rapid repair material in the negative temperature environment is different from that of the embodiment 1 in that:
step 2) mixing 0.8 part by weight of defoamer, 1.2 parts by weight of water-retaining agent, 0.8 part by weight of expanding agent, 0.8 part by weight of nano silicon dioxide and 2 parts by weight of sodium nitrite according to parts by weight, and stirring for 5min at a speed of 200r/min to obtain a component B; i.e. no lithium carbonate is added to the rapid repair material.
Comparative example 2:
the preparation method of the cement composite-based rapid repair material in the negative temperature environment is different from that of the embodiment 1 in that:
step 2) mixing 0.4 weight part of lithium carbonate, 0.8 weight part of defoaming agent, 1.2 weight part of water-retaining agent, 0.8 weight part of expanding agent and 0.8 weight part of nano silicon dioxide according to weight parts, and stirring for 5min at a speed of 200r/min to obtain a component B; namely, sodium nitrite is not added into the rapid repair material.
Test example 1:
the test method comprises the following steps: the cement composite-based quick repair materials of example 1, comparative example 1 and comparative example 2 were added to a mixer, stirred at a rate of 100r/min for 45s, and uniformly dispersed; then adding water accounting for 12% of the weight of the quick repair material, stirring for 100s at the speed of 200r/min, pouring the obtained slurry into a steel triple test mold with the thickness of 40mm multiplied by 160mm, and then placing the steel triple test mold into a specified curing box for curing. Stirring and forming environment: the temperature is 20 ℃ and the humidity is more than or equal to 50%; maintenance environment: the temperature is respectively 0 ℃, -5 ℃, -10 ℃ and the humidity is as follows: more than or equal to 50 percent. Setting time was determined by reference to GB/T1346-2011 method for testing water consumption, setting time, stability of Cement Standard consistency, 3 replicates per test group, and averaged. The results are shown in Table 1.
TABLE 1
The result shows that when the rapid repair material simultaneously comprises lithium carbonate and sodium nitrite, sufficient liquid phase water can be ensured to participate in hydration reaction under the negative temperature environment, so that the hydration reaction is promoted, the rapid setting and hardening time of a cement system under the negative temperature state is reduced, and the cement composite-based rapid repair material is completely suitable for being applied in the negative temperature environment.
Example 2:
a preparation method of a cement composite-based rapid repair material in a negative temperature environment comprises the following steps:
1) Mixing 360 parts by weight of quick-hardening sulphoaluminate cement, 25 parts by weight of ordinary silicate cement, 25 parts by weight of silica fume, 565.4 parts by weight of quartz sand (10-20 meshes 373.4 parts, 20-40 meshes 97 parts and 70-140 meshes 95 parts), 2 parts by weight of polypropylene fiber, 16 parts by weight of rubber powder, 1 part by weight of carbon black and 2.6 parts by weight of water reducer according to parts by weight, and stirring at a speed of 150r/min for 5min to obtain a component A;
2) Mixing 0.6 weight part of lithium carbonate, 0.5 weight part of defoaming agent, 0.4 weight part of water-retaining agent, 0.2 weight part of expanding agent, 0.3 weight part of nano silicon dioxide and 1 weight part of sodium nitrite according to weight parts, and stirring at a speed of 150r/min for 5min to obtain a component B;
3) Mixing the component A and the component B, stirring at a constant speed of 150r/min for 10min, and sealing in a moisture-proof packaging bag after uniform mixing, thus obtaining the rapid repair material.
The length of the polypropylene fiber is 6mm. The water-retaining agent is compounded by hydroxypropyl methyl cellulose and water-absorbing resin according to the weight ratio of 1:1. The expanding agent is compounded by calcium oxide expanding agent and magnesium oxide expanding agent according to the weight ratio of 1:1.
Example 3:
the preparation method of the cement composite-based rapid repair material in the negative temperature environment is different from that in the embodiment 2 in the following steps:
1) Mixing 375 parts by weight of quick-hardening sulphoaluminate cement, 20 parts by weight of ordinary silicate cement, 30 parts by weight of silica fume, 552 parts by weight of quartz sand (10-20 meshes of 370 parts, 20-40 meshes of 92 parts and 70-140 meshes of 90 parts), 2 parts by weight of polypropylene fiber, 17.5 parts by weight of rubber powder, 1 part by weight of carbon black and 2.9 parts by weight of water reducer according to parts by weight, and stirring at a speed of 300r/min for 2min to obtain a component A;
2) Mixing 0.75 weight part of lithium carbonate, 0.65 weight part of defoaming agent, 0.75 weight part of water-retaining agent, 0.5 weight part of expanding agent, 0.45 weight part of nano silicon dioxide and 1.5 weight part of sodium nitrite according to weight parts, and stirring at a speed of 200r/min for 2min to obtain a component B;
3) Mixing the component A and the component B, stirring at a constant speed of 200r/min for 5min, and sealing in a moisture-proof packaging bag after uniform mixing, thus obtaining the rapid repair material.
Example 4:
the preparation method of the cement composite-based rapid repair material in the negative temperature environment is different from that in the embodiment 2 in the following steps:
1) Mixing 380 parts by weight of quick-hardening sulphoaluminate cement, 25 parts by weight of ordinary silicate cement, 30 parts by weight of silica fume, 533 parts by weight of quartz sand (10-20 meshes 361 parts, 20-40 meshes 87 parts and 70-140 meshes 85 parts), 2 parts by weight of polypropylene fiber, 19.5 parts by weight of rubber powder, 1 part by weight of carbon black and 3.15 parts by weight of water reducer according to parts by weight, and stirring for 3min at a speed of 240r/min to obtain a component A;
2) Mixing 0.85 parts by weight of lithium carbonate, 0.7 parts by weight of a defoaming agent, 1.0 part by weight of a water-retaining agent, 0.65 parts by weight of an expanding agent, 0.5 parts by weight of nano silicon dioxide and 2.65 parts by weight of sodium nitrite according to parts by weight, and stirring at a speed of 140r/min for 4min to obtain a component B;
3) Mixing the component A and the component B, stirring at a constant speed of 150r/min for 7min, and sealing in a moisture-proof packaging bag after uniform mixing, thus obtaining the rapid repair material.
Comparative example 3:
the preparation method of the cement composite-based rapid repair material in the negative temperature environment is different from that in the embodiment 2 in the following steps:
step 2) mixing 0.6 weight part of lithium carbonate, 0.5 weight part of defoaming agent, 0.4 weight part of water-retaining agent, 0.2 weight part of expanding agent, 0.3 weight part of nano silicon dioxide and 2 weight parts of sodium nitrite according to weight parts, and stirring at a speed of 150r/min for 5min to obtain a component B; namely, the weight ratio of the lithium carbonate to the sodium nitrite in the auxiliary materials is 0.3:1.
Comparative example 4:
the preparation method of the cement composite-based rapid repair material in the negative temperature environment is different from that in the embodiment 2 in the following steps:
step 2) mixing 0.96 weight part of lithium carbonate, 0.5 weight part of defoaming agent, 0.4 weight part of water-retaining agent, 0.2 weight part of expanding agent, 0.3 weight part of nano silicon dioxide and 1.2 weight part of sodium nitrite according to weight parts, and stirring at a speed of 150r/min for 5min to obtain a component B; namely, the weight ratio of the lithium carbonate to the sodium nitrite in the auxiliary materials is 0.8:1.
Test example 2:
the test method comprises the following steps: the cement composite-based quick repair materials of examples 2 to 4 and comparative examples 3 and 4 were added into a mixer, stirred at a rate of 100r/min for 45s, and uniformly dispersed; adding water, stirring at a speed of 200r/min for 100s, pouring the obtained slurry into a steel triple test mold with the thickness of 40mm multiplied by 160mm, and then placing into a specified curing box for curing. Stirring and forming environment: the temperature is 20 ℃ and the humidity is more than or equal to 50%; maintenance environment: humidity: more than or equal to 50 percent.
Setting time is measured by referring to GB/T1346-2011 method for testing water consumption, setting time and stability of cement standard consistency, and compressive strength is measured according to GB/T17671-1999 method for testing cement mortar strength (ISO method); the fluidity is tested by referring to GB/T2419-2005 cement mortar fluidity measurement method, the bonding strength is carried out according to JGJ70-2009 building mortar basic performance test method standard, and the base material is a concrete slab meeting the JCT547-2005 ceramic wall and floor tile adhesive standard. The volume stability is measured according to T0511-2005 cement mortar dry shrinkage test method. The bleeding rate is tested according to GB/T50080-2016 standard for testing the performance of common concrete mixtures, and the elastic modulus is tested according to GB/T50082-2009 standard for testing the long-term performance and durability of common concrete. Each test group was set to 3 replicates and averaged. The results are shown in Table 2.
TABLE 2
The result shows that the rapid repairing material has the characteristics of good fluidity, quick setting time, low elastic modulus, high early strength, stable development of later strength, high bonding strength and the like, can realize rapid grouting construction, has the shrinkage rate meeting the requirement that the 28d shrinkage rate required in the cement concrete pavement slab repairing material and repairing technology comparison is not more than 0.02 percent, can achieve the compressive strength of more than 20MPa even if being maintained for 2 hours in a negative temperature environment, meets the open traffic regulations, and is suitable for rapid rush repair in the negative temperature environment.
The results of comparative example 2, comparative example 3 and comparative example 4 show that the hydration reaction can be promoted to the greatest extent only by adding lithium carbonate and sodium nitrite in a specific proportion into the rapid repair material, and the early hydration of cement minerals is improved cooperatively, the setting time is reduced, and the early strength is improved, so that the engineering requirements of 2h traffic are met.
Example 5:
the preparation method of the cement composite-based rapid repair material in the negative temperature environment is different from that in the embodiment 2 in the following steps:
step 2) mixing 0.6 weight part of lithium carbonate, 0.5 weight part of defoamer, 0.4 weight part of water retention agent, 0.2 weight part of expanding agent, 0.3 weight part of nano silicon dioxide, 1 weight part of sodium nitrite, 0.7 weight part of starch acetate and 1.2 weight part of calcium hydroxy phosphate according to weight parts, and stirring at a speed of 160r/min for 4min to obtain a component B.
Comparative example 5:
the preparation method of the cement composite-based rapid repair material in the negative temperature environment is different from that in the embodiment 5 in the following steps:
step 2) mixing 0.6 weight part of lithium carbonate, 0.6 weight part of defoamer, 0.8 weight part of water retention agent, 1.0 weight part of expanding agent, 0.5 weight part of nano silicon dioxide, 1.2 weight part of sodium nitrite and 0.7 weight part of starch acetate according to weight parts, and stirring at a rate of 160r/min for 4min to obtain a component B.
Comparative example 6:
the preparation method of the cement composite-based rapid repair material in the negative temperature environment is different from the embodiment 5 in the following steps:
step 2) mixing 0.6 weight part of lithium carbonate, 0.6 weight part of defoamer, 0.8 weight part of water retention agent, 1.0 weight part of expanding agent, 0.5 weight part of nano silicon dioxide, 1.2 weight part of sodium nitrite and 1.2 weight part of calcium hydroxy phosphate according to weight parts, and stirring at a rate of 160r/min for 4min to obtain a component B.
Test example 3:
the test method comprises the following steps: the cement composite-based quick repair materials of example 2, example 5 and comparative example 6 were added to a mixer and stirred at a rate of 100r/min for 45s, and uniformly dispersed; then adding water accounting for 14% of the weight of the quick repair material, stirring for 100s at the speed of 200r/min, pouring the obtained slurry into a steel triple test mold with the thickness of 40mm multiplied by 160mm, and then placing the steel triple test mold into a specified curing box for curing. Stirring and forming environment: the temperature is 20 ℃ and the humidity is more than or equal to 50%; maintenance environment: the temperature is-5 ℃ and the humidity is more than or equal to 50 percent. Each test group was set to 3 replicates and averaged. Compressive strength was measured according to the method in test example 2.
Freeze resistance determination: each test block was first cured in a curing chamber for 26 days, and then immersed in water for 2 days. Before the freeze-thawing cycle test, the test block is taken out of water and the surface moisture is wiped off, the mass is called and the initial compressive strength is tested. After the initial quality and the compressive strength of the test piece maintenance 28d are tested, the test piece is placed in a KDR-A concrete quick freezing and thawing test machine for a freezing and thawing test, and the freezing and thawing test method refers to a quick freezing method. The test piece is frozen and melted at a temperature range of (-18-5) +/-2 ℃, the mass and the compressive strength of the test piece are tested 25 times per freeze-thawing cycle, the mass loss rate and the strength loss rate are used as indexes for evaluating the freezing resistance of the test piece, the freeze-thawing time is 150 times, and the test is stopped when the mass loss rate and the compressive strength loss rate of the test piece in the freeze-thawing cycle exceed 5% and 25% respectively. The mass loss rate is the ratio of the mass difference of the test block before the freeze thawing cycle and after the freeze thawing n times to the mass of the test block before the freeze thawing cycle, and the compressive strength loss rate is the ratio of the compressive strength difference of the test block before the freeze thawing cycle and after the freeze thawing n times to the compressive strength of the test block before the freeze thawing cycle. The results are shown in Table 3, FIG. 1 and FIG. 2.
TABLE 3 Table 3
| Example 2 | Example 5 | Comparative example 5 | Comparative example 6 | |
| Compressive strength MPa for 2h | 25.4 | 25.7 | 25.5 | 25.1 |
| Compressive strength MPa for 24 hours | 50.5 | 50.6 | 50.7 | 50.4 |
| 3d compressive Strength MPa | 60.9 | 62.4 | 61.5 | 61.2 |
| 28d compressive strength MPa | 68.7 | 73.7 | 70.8 | 70.3 |
The results show that the early strength of the rapid repair material added with the starch acetate and the calcium hydroxy phosphate in example 5 is not obviously different from that of the rapid repair material not added in example 2, but the later strength is obviously improved, and the early strength and the later strength are obviously improved in a synergistic way, so that the compactness and the integrity of the material are improved, and the later strength development can be continuously provided.
FIG. 1 is a graph showing the relationship between the mass loss rate and the freeze-thaw cycle times of different rapid repair materials.
FIG. 2 is a graph showing the relationship between the compressive strength loss rate and the freeze-thaw cycle times of different rapid repair materials.
The results in FIG. 1 show that the mass loss rate for example 5 is only 0.64% at 150 freeze-thaw cycles, which is much lower than 1.33% for example 2, and that the differences are less pronounced for comparative examples 5 and 6 than for example 2. The results of fig. 2 show that the early compressive strength loss rates of example 2, comparative example 6 and comparative example 5 increase slowly, the later compressive strength loss rate increases rapidly, the compressive strength loss rate of each group is lower than 15% when the number of freeze-thawing cycles is less than 75, the compressive strength loss rates of example 2 and comparative example 6 increase sharply when the number of freeze-thawing cycles is greater than 75, and finally the compressive strength loss rate exceeds 25% at the end of the test, while the compressive strength loss rate of comparative example 5 reaches 24.3% at the end of the test, and the compressive strength loss rate of example 5 increases relatively gently, and does not exceed 20% at the end of the test.
Both sets of test results in fig. 1 and 2 show that the mass loss rate and the compressive strength loss rate of the rapid repair material in example 5 are obviously lower than those in example 2, and the rapid repair material shows a remarkable synergistic effect of 1+1 > 2, which indicates that starch acetate and calcium hydroxy phosphate cooperate with other components to form a gel-like structure, the gel-like structure is filled in the pores of the repair material, the compactness of the cement is increased, and the compressive strength loss rate after freeze thawing are obviously reduced, and the freezing resistance of the rapid repair material are enhanced.
It should be noted that, in the present invention, detailed steps of part of operations are not described in detail, but are known in the prior art by those skilled in the art, and thus are not described herein. Moreover, in the present invention, all features such as values, amounts, contents, and concentrations defined in numerical ranges or percentage ranges are for brevity and convenience only. Accordingly, the description of a numerical range or percentage range should be considered to cover and specifically disclose all possible sub-ranges and individual values (including integers and fractions) within the range.
Finally, it should be noted that the foregoing examples are only for illustrating the technical solution of the present invention, and not for limiting the same, and all possible combinations of the technical features in the various embodiments or examples are not described in the present invention, so long as there is no contradiction between the combinations of the technical features, and any combination of the technical features in the various embodiments or examples may be performed, and all possible combinations should be considered as the scope described in the present specification. Although the invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art will appreciate that; the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.
Claims (10)
1. The cement composite-based rapid repair material in a negative temperature environment is characterized by comprising the following components: 35-45% of mixed cement and 55-65% of auxiliary materials;
wherein the mixed cement comprises: 350-400 parts by weight of quick hardening sulphoaluminate cement and 18-28 parts by weight of ordinary silicate cement;
the auxiliary materials comprise: 20 to 33 parts by weight of silica fume, 520 to 580 parts by weight of quartz sand, 1 to 3 parts by weight of polypropylene fiber, 15 to 25 parts by weight of rubber powder, 0.5 to 2.0 parts by weight of carbon black, 2 to 4 parts by weight of water reducing agent, 0.2 to 1.5 parts by weight of lithium carbonate, 0.5 to 1.0 part by weight of defoamer, 0.3 to 1.5 parts by weight of water retaining agent, 0.1 to 0.8 part by weight of expanding agent, 0.2 to 1.0 part by weight of nano silicon dioxide and 0.5 to 3.5 parts by weight of sodium nitrite.
2. The rapid repair material of claim 1, wherein the rapid repair material comprises: 37-42% of mixed cement and 58-63% of auxiliary materials;
wherein the mixed cement comprises: 355-385 parts by weight of quick-hardening sulphoaluminate cement and 20-25 parts by weight of ordinary silicate cement;
the auxiliary materials comprise: 25-30 parts of silica fume, 530-570 parts of quartz sand, 2-3 parts of polypropylene fiber, 15-20 parts of rubber powder, 0.5-1.5 parts of carbon black, 2.5-3.5 parts of water reducing agent, 0.4-1.0 parts of lithium carbonate, 0.3-1.0 parts of defoamer, 0.3-1.0 parts of water retaining agent, 0.1-1.0 parts of expanding agent, 0.2-0.5 parts of nano silicon dioxide and 0.8-2.8 parts of sodium nitrite.
3. The rapid repair cement composite base material under the negative temperature environment according to claim 1, wherein the rapid hardening sulphoaluminate cement is R.SAC42.5 or R.SAC52.5; the Portland cement is P.O.42.5 or P.O.52.5.
4. The rapid repair material based on cement composite in a negative temperature environment according to claim 1, wherein the particle size of the quartz sand is classified into 10-20 mesh, 20-40 mesh and 70-140 mesh; wherein, the weight part of the quartz sand with 10 to 20 meshes is 360 to 375 parts, the weight part of the quartz sand with 20 to 40 meshes is 85 to 100 parts, and the weight part of the quartz sand with 70 to 140 meshes is 85 to 95 parts.
5. The rapid repair cement composite material according to claim 1, wherein the rubber powder is at least one of ethylene-vinyl acetate copolymer rubber powder, acrylic polymer rubber powder, polyethylene oxide rubber powder, styrene-acrylic rubber powder and styrene-butadiene rubber powder.
6. The rapid repair material based on cement composite in a negative temperature environment according to claim 1, wherein the specific surface area of the silica fume is 20000m 2 /kg; the water reducer is a polycarboxylic acid high-efficiency water reducer; the length specification of the polypropylene fiber is 3mm, 6mm or 9mm; the water-retaining agent is compounded by hydroxypropyl methyl cellulose and water-absorbing resin according to the weight ratio of (0.5-1.5): 1; the expanding agent is compounded by calcium oxide expanding agent and magnesium oxide expanding agent according to the weight ratio of 1 (0.5-1.5).
7. The rapid repair material based on cement composite in negative temperature environment according to any one of claims 1 to 6, wherein the weight ratio of lithium carbonate to sodium nitrite in the auxiliary material is (0.4 to 0.6): 1.
8. The preparation method of the cement composite-based rapid repair material in the negative temperature environment is characterized by comprising the following steps of:
1) Mixing quick hardening sulphoaluminate cement, ordinary portland cement, silica fume, quartz sand, polypropylene fiber, rubber powder, carbon black and a water reducing agent according to parts by weight, and stirring for 2-5 min at a speed of 120-300 r/min to obtain a component A;
2) Mixing lithium carbonate, a defoaming agent, a water-retaining agent, an expanding agent, nano silicon dioxide and sodium nitrite according to parts by weight, and stirring at a speed of 140-200 r/min for 2-5 min to obtain a component B;
3) Mixing the component A and the component B, stirring at a constant speed of 100-200 r/min for 5-10 min, uniformly mixing, and sealing in a moistureproof packaging bag to obtain the cement composite-based rapid repair material under the negative temperature environment of any one of claims 1-7.
9. The method for preparing a cement composite-based rapid repair material in a negative temperature environment according to claim 8, wherein the rapid repair material comprises: 350-400 parts by weight of quick-hardening sulphoaluminate cement, 18-28 parts by weight of ordinary portland cement, 20-33 parts by weight of silica fume, 520-580 parts by weight of quartz sand, 1-3 parts by weight of polypropylene fiber, 15-25 parts by weight of rubber powder, 0.5-2.0 parts by weight of carbon black, 2-4 parts by weight of water reducer, 0.2-1.5 parts by weight of lithium carbonate, 0.5-1.0 parts by weight of defoamer, 0.3-1.5 parts by weight of water retention agent, 0.1-0.8 parts by weight of expanding agent, 0.2-1.0 parts by weight of nano silicon dioxide and 0.5-3.5 parts by weight of sodium nitrite.
10. The application of the cement composite-based rapid repair material in the negative temperature environment in repairing road and bridge surfaces and expansion joints, which is characterized in that the rapid repair material is the cement composite-based rapid repair material in the negative temperature environment according to any one of claims 1 to 7; the rapid repair material is free from heating and maintenance in a negative temperature environment, and the traffic is opened for 2 hours.
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