CN112851221A - Anti-disturbance concrete and preparation method thereof - Google Patents
Anti-disturbance concrete and preparation method thereof Download PDFInfo
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- CN112851221A CN112851221A CN202110180878.8A CN202110180878A CN112851221A CN 112851221 A CN112851221 A CN 112851221A CN 202110180878 A CN202110180878 A CN 202110180878A CN 112851221 A CN112851221 A CN 112851221A
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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
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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
- 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
Abstract
The invention relates to disturbance resistant concrete and a preparation method thereof, wherein the disturbance resistant concrete comprises the following components in parts by weight: 12-18 parts of cement, 64-69 parts of sand, 3-6 parts of silica fume, 0.3-0.6 part of fiber, 0.2-0.4 part of water reducing agent, 6.5-8.5 parts of water and 2-5 parts of temperature-sensitive hydrogel. Compared with the prior art, the method can effectively reduce the disturbance-induced cracks, improve the compactness of concrete and repair the cracks in time when the cracks are generated.
Description
Technical Field
The invention relates to the technical field of concrete, in particular to disturbance-resistant concrete and a preparation method thereof.
Background
In the road surface expanding project, the demand of continuous traffic is increasing day by day. At the joint of the new concrete and the old concrete, the strength of the concrete is reduced under the influence of the vibration load of the vehicle on the road surface in service after the initial setting of the new concrete. Some loss of strength can be tolerated by the use of UHPC and the like, due to its higher design strength, but the higher cost of UHPC makes this approach unacceptable to the owner. Therefore, the disturbance-resistant concrete has important practical significance and obvious economic benefit. The main ideas of the existing preparation method of the disturbance-resistant concrete are to adjust the mix proportion of the concrete to shorten the disturbed time, and add an expanding agent and a toughening agent to reduce surface cracks, improve the self-healing rate and the like.
The invention patent CN106278030B discloses an application of a temperature-sensitive hydrogel in improving the drying shrinkage cracking resistance of concrete, and concrete preparation raw materials comprise the temperature-sensitive hydrogel, cement, aggregate and water. The preparation method of the concrete comprises the steps of firstly preparing the temperature-sensitive hydrogel, then uniformly mixing the aggregate and the cement, finally adding the temperature-sensitive hydrogel and water, and uniformly mixing to obtain the concrete. The preparation raw materials of the temperature-sensitive hydrogel comprise an N-isopropyl acrylamide monomer, deionized water, an initiator and a cross-linking agent. The temperature-sensitive hydrogel is used as an internal curing agent of the cement concrete, and the hydration heat release of the cement is used as the water release power of the temperature-sensitive hydrogel to perform internal curing on the cement concrete, so that the shrinkage rate of the concrete is reduced, and the dry shrinkage resistance of the concrete is finally improved. The temperature-sensitive hydrogel is a lightly crosslinked polymer, is polymerized into a film after water release, does not leave holes in the cement concrete, and does not influence other properties of the cement concrete while improving the cracking resistance of the concrete. However, the crack response of the hydrogels of this invention is not stable and requires further exploration and study.
Disclosure of Invention
The invention aims to provide disturbance-resistant concrete and a preparation method thereof, which can effectively reduce the cracks caused by disturbance, improve the compactness of the concrete and repair the cracks in time when the cracks are generated.
The purpose of the invention can be realized by the following technical scheme: the anti-disturbance concrete comprises the following components in parts by weight: 12-18 parts of cement, 64-69 parts of sand, 3-6 parts of silica fume, 0.3-0.6 part of fiber, 0.2-0.4 part of water reducing agent, 6.5-8.5 parts of water and 2-5 parts of temperature-sensitive hydrogel.
According to the invention, the temperature-sensitive hydrogel is added into the concrete, so that the self-healing rate of the disturbed concrete is improved, when micro cracks appear on the surface of the concrete due to disturbance, the hydrogel at the cracks is automatically bonded under the chemical action, so that the cracks are inhibited, the micro cracks in the disturbed concrete are partially repaired within a certain period, the strength of the cracked parts can be improved, the ductile bending capability is enhanced, the performance of the whole structure is improved, and the rigidity and the strength of the structure can be recovered.
Further, the temperature-sensitive hydrogel is poly N-isopropyl acrylamide hydrogel. The poly-N-isopropyl acrylamide hydrogel has rich hydrophilic groups, stores a large number of water molecules at normal temperature, releases water when the temperature is higher than the low critical dissolution temperature, can improve the water content at the crack, promotes the hydration of cement at the crack and the precipitation of calcium carbonate, releases a large amount of heat in the cement hydration process, releases water, promotes the hydration of the cement, and increases the generation amount of hydration products.
Furthermore, the polymerization degree of the poly N-isopropylacrylamide hydrogel is 3-9. The poly-N-isopropylacrylamide hydrogel used in the invention is a lightly crosslinked polymer, and is polymerized into a film after water release, so that holes cannot be left in cement concrete, and the cracking resistance of the concrete is improved without affecting other properties of the cement concrete.
The poly N-isopropyl acrylamide hydrogel is obtained by reacting an N-isopropyl acrylamide monomer under the action of an initiator and a cross-linking agent. The initiator comprises ammonium persulfate, potassium persulfate, sodium persulfate and the like, and the cross-linking agent comprises tetramethylethylenediamine, dicumyl peroxide, acrylic acid and the like.
The molar ratio of the N-isopropylacrylamide monomer to the initiator to the crosslinking agent is 4.32-4.44: 0.83-0.85: 1; the reaction temperature is 25-30 ℃, the reaction time is 2-2.5 h, the reaction is carried out in deionized water, and the mass ratio of the N-isopropylacrylamide monomer to the deionized water is 0.001-0.0015: 1.
The fiber comprises steel fiber, polyvinyl alcohol fiber or polypropylene fiber. The addition of the fiber can improve the crack resistance of the concrete. The steel fiber is doped to improve the mechanical property of concrete, the compressive strength can be improved by 10-18%, the bending tensile strength is improved by 25-40%, and the splitting tensile strength is improved by about 30%; the polyvinyl alcohol fiber is high-quality polyvinyl alcohol with high polymerization degree, has good mechanical property, high elastic modulus and strength, has the characteristics of acid resistance and corrosion resistance, and has good dispersibility; the polypropylene fiber has the characteristics of alkali resistance and good dispersibility, and has higher toughness and strength.
The particle size range of the sand is 5-18 mm; the particle size range of the silica fume is 0.1-0.42 mu m. The silica fume has small particle size and high activity, can promote the hydration reaction of cement, can fill pores and improve the compactness of concrete.
The water reducing agent comprises naphthalene sulfonate formaldehyde condensate, calcium lignosulfonate or polycyclic aromatic sulfonate formaldehyde condensate. The water reducing rate of the naphthalene water reducing agent is about 20-30%, and the rhodamine is small, so that the strength and plasticity of the concrete can be improved, and the early strength effect of the concrete can be realized; the water reducing rate of the lignosulfonate water reducing agent is about 10-14%, so that the workability of concrete can be improved, and the loss of the concrete is inhibited; the polycyclic aromatic sulfonate formaldehyde condensate water reducing agent has good early strength effect, improves workability and improves freezing resistance and permeation resistance.
The components of the concrete have good synergistic effect, the activity of the silica fume is high, the particle size is small, the specific surface area is large, and the silica fume as a cementing material can effectively reduce the cost and promote the hydration reaction of the cement; the fiber improves the toughness of the concrete, when a concrete crack interface is generated, the concrete cannot be suddenly brittle-broken, and the fiber can effectively improve the fracture resistance and the bending resistance of the concrete; the poly N-isopropyl acrylamide hydrogel is used as a repairing material, and reacts in time to repair the crack when the crack occurs, and the concrete is repaired under the synergistic action of the fibers.
The preparation method of the disturbance-resistant concrete specifically comprises the following steps:
(1) weighing the components in parts by weight;
(2) uniformly stirring cement, sand, silica fume and half of fibers, adding the rest half of fibers, then adding water for slow stirring, adding a water reducing agent after stirring for a period of time, and then quickly stirring for a period of time;
(3) adding temperature-sensitive hydrogel, and rapidly stirring for a period of time to obtain the disturbance-resistant concrete.
Further, the slow stirring speed in the step (2) is 600-800 rpm, the slow stirring time is 2.5-3 min, the fast stirring speed is 1500-1800 rpm, and the fast stirring time is 4-4.5 min; the rapid stirring speed in the step (3) is 1500-1800 rpm, and the rapid stirring time is 3-3.5 min.
Compared with the prior art, the invention has the following advantages:
1. according to the invention, the temperature-sensitive hydrogel is added into the concrete, so that the self-healing rate of the disturbed concrete is improved, and when the surface of the concrete is disturbed and micro cracks appear, the micro cracks in the disturbed concrete can be partially repaired by the hydrogel within a certain period;
2. the invention can effectively reduce the disturbance-induced cracks, improve the compactness of concrete and repair the cracks in time when the cracks are generated;
3. the poly-N-isopropylacrylamide hydrogel used in the invention has rich hydrophilic groups, stores a large amount of water molecules at normal temperature, releases water when the temperature is higher than the low critical dissolving temperature, can improve the water content at the crack, and promotes the hydration of cement and the precipitation of calcium carbonate at the crack;
4. according to the invention, through selection of the addition amounts of the components such as cement, sand, silica fume, fiber, a water reducing agent, temperature-sensitive hydrogel and the like, a synergistic effect is generated among the components, the silica fume has small particle size and high activity, the hydration reaction of the cement can be promoted, the pores can be filled, the compactness of the concrete is improved, the temperature-sensitive hydrogel is bonded with the interface when cracks are generated, the cracks are prevented from being increased, and the concrete is repaired;
5. according to the invention, through setting the preparation conditions of the poly N-isopropylacrylamide hydrogel, the repairing and bonding effects of the hydrogel are improved, and the response characteristic of the crack is enhanced;
6. according to the invention, through setting the adding sequence of raw materials, the stirring speed and the stirring time in the concrete preparation process, the concrete is fully stirred, the aggregate is uniformly distributed, the cement is fully contacted with materials such as water, cementing materials and sand, and the compactness of the concrete is improved;
7. the invention effectively solves the problems that the hydration process, the surface cracking, the strength reduction and the like of the concrete in the initial setting middle section are influenced by external vibration and the like, and can be used for pouring new and old pavement structures such as expressways and the like under the condition of not interrupting traffic.
Detailed Description
The following examples are given to illustrate the present invention, and the following examples are carried out on the premise of the technical solution of the present invention, and give detailed embodiments and specific procedures, but the scope of the present invention is not limited to the following examples.
Example 1
The preparation method of the disturbance-resistant concrete comprises the following steps:
(1) putting an N-isopropylacrylamide monomer into deionized water at the temperature of 25-30 ℃, fully stirring, adding ammonium persulfate and tetramethylethylenediamine, wherein the molar ratio of the N-isopropylacrylamide monomer to the ammonium persulfate to the tetramethylethylenediamine is 4.32-4.44: 0.83-0.85: 1, and reacting for 2-2.5 hours to obtain poly-N-isopropylacrylamide hydrogel with the polymerization degree of 3-9;
(2) weighing 12-18 parts of cement, 64-69 parts of sand, 3-6 parts of silica fume, 0.3-0.6 part of steel fiber, 0.2-0.4 part of naphthalene sulfonate formaldehyde condensate, 6.5-8.5 parts of water and 2-5 parts of poly N-isopropyl acrylamide hydrogel according to parts by weight;
(3) uniformly stirring cement, sand, silica fume and a half steel fiber, adding the remaining half steel fiber, adding water for slow stirring at the stirring speed of 600-800 rpm, stirring for 2.5-3 min, adding a naphthalene sulfonate formaldehyde condensation compound, and quickly stirring at the stirring speed of 1500-1800 rpm for 4-4.5 min;
(4) adding poly N-isopropyl acrylamide hydrogel, and rapidly stirring at a stirring speed of 1500-1800 rpm for 3-3.5 min to obtain the disturbance-resistant concrete.
The concrete was poured into a 160mm x 40mm triplex mold for performance testing.
Example 2
The preparation method of the disturbance-resistant concrete comprises the following steps:
(1) putting an N-isopropylacrylamide monomer into deionized water at the temperature of 25-30 ℃, fully stirring, adding ammonium persulfate and tetramethylethylenediamine, wherein the molar ratio of the N-isopropylacrylamide monomer to the ammonium persulfate to the tetramethylethylenediamine is 4.32-4.44: 0.83-0.85: 1, and reacting for 2-2.5 hours to obtain poly-N-isopropylacrylamide hydrogel with the polymerization degree of 3-9;
(2) weighing 12-18 parts of cement, 64-69 parts of sand, 3-6 parts of silica fume, 0.3-0.6 part of polyvinyl alcohol fiber, 0.2-0.4 part of naphthalene sulfonate formaldehyde condensate, 6.5-8.5 parts of water and 2-5 parts of poly N-isopropylacrylamide hydrogel according to parts by weight;
(3) uniformly stirring cement, sand, silica fume and half of polyvinyl alcohol fibers, adding the rest half of polyvinyl alcohol fibers, adding water for slow stirring at the stirring speed of 600-800 rpm, stirring for 2.5-3 min, adding calcium lignosulfonate, and quickly stirring for 4-4.5 min at the stirring speed of 1500-1800 rpm;
(4) adding poly N-isopropyl acrylamide hydrogel, and rapidly stirring at a stirring speed of 1500-1800 rpm for 3-3.5 min to obtain the disturbance-resistant concrete.
The concrete was poured into a 160mm x 40mm triplex mold for performance testing.
Example 3
The preparation method of the disturbance-resistant concrete comprises the following steps:
(1) putting an N-isopropylacrylamide monomer into deionized water at the temperature of 25-30 ℃, fully stirring, adding ammonium persulfate and tetramethylethylenediamine, wherein the molar ratio of the N-isopropylacrylamide monomer to the ammonium persulfate to the tetramethylethylenediamine is 4.32-4.44: 0.83-0.85: 1, and reacting for 2-2.5 hours to obtain poly-N-isopropylacrylamide hydrogel with the polymerization degree of 3-9;
(2) weighing 12-18 parts of cement, 64-69 parts of sand, 3-6 parts of silica fume, 0.3-0.6 part of polypropylene fiber, 0.2-0.4 part of naphthalene sulfonate formaldehyde condensate, 6.5-8.5 parts of water and 2-5 parts of poly N-isopropyl acrylamide hydrogel according to parts by weight;
(3) uniformly stirring cement, sand, silica fume and half of polypropylene fibers, adding the rest half of the polypropylene fibers, then adding water for slow stirring at the stirring speed of 600-800 rpm, stirring for 2.5-3 min, then adding a polycyclic aromatic sulfonate formaldehyde condensate, and then quickly stirring for 4-4.5 min at the stirring speed of 1500-1800 rpm;
(4) adding poly N-isopropyl acrylamide hydrogel, and rapidly stirring at a stirring speed of 1500-1800 rpm for 3-3.5 min to obtain the disturbance-resistant concrete.
The concrete was poured into a 160mm x 40mm triplex mold for performance testing.
Comparative example 1
The preparation method of the concrete comprises the following steps:
(1) weighing 12-18 parts of cement, 64-69 parts of sand, 3-6 parts of silica fume, 0.3-0.6 part of polypropylene fiber, 0.2-0.4 part of naphthalene sulfonate formaldehyde condensate and 6.5-8.5 parts of water according to parts by weight;
(3) uniformly stirring cement, sand, silica fume and half of the polypropylene fibers, adding the rest half of the polypropylene fibers, then adding water for slow stirring at the stirring speed of 600-800 rpm, stirring for 2.5-3 min, then adding the polycyclic aromatic sulfonate formaldehyde condensate, and then quickly stirring for 4-4.5 min at the stirring speed of 1500-1800 rpm to obtain the concrete.
The concrete was poured into a 160mm x 40mm triplex mold for performance testing.
Comparative example 2
The preparation method of the concrete comprises the following steps:
(1) putting an N-isopropylacrylamide monomer into deionized water at the temperature of 25-30 ℃, fully stirring, adding ammonium persulfate and tetramethylethylenediamine, wherein the molar ratio of the N-isopropylacrylamide monomer to the ammonium persulfate to the tetramethylethylenediamine is 4.32-4.44: 0.83-0.85: 1, and reacting for 2-2.5 hours to obtain poly-N-isopropylacrylamide hydrogel with the polymerization degree of 3-9;
(2) weighing 12-18 parts of cement, 64-69 parts of sand, 3-6 parts of silica fume, 0.2-0.4 part of naphthalene sulfonate formaldehyde condensate, 6.5-8.5 parts of water and 2-5 parts of poly N-isopropylacrylamide hydrogel according to parts by weight;
(3) uniformly stirring cement, sand and silica fume, then adding water for slow stirring at the stirring speed of 600-800 rpm, stirring for 2.5-3 min, then adding a polycyclic aromatic sulfonate formaldehyde condensate, and then quickly stirring for 4-4.5 min at the stirring speed of 1500-1800 rpm;
(4) adding poly N-isopropyl acrylamide hydrogel, and rapidly stirring at a stirring speed of 1500-1800 rpm for 3-3.5 min to obtain the concrete.
The concrete was poured into a 160mm x 40mm triplex mold for performance testing.
Comparative example 3
The preparation method of the concrete comprises the following steps:
(1) putting an N-isopropylacrylamide monomer into deionized water at the temperature of 25-30 ℃, fully stirring, adding ammonium persulfate and tetramethylethylenediamine, wherein the molar ratio of the N-isopropylacrylamide monomer to the ammonium persulfate to the tetramethylethylenediamine is 4.32-4.44: 0.83-0.85: 1, and reacting for 2-2.5 hours to obtain poly-N-isopropylacrylamide hydrogel with the polymerization degree of 3-9;
(2) weighing 12-18 parts of cement, 64-69 parts of sand, 0.3-0.6 part of polypropylene fiber, 0.2-0.4 part of naphthalene sulfonate formaldehyde condensate, 6.5-8.5 parts of water and 2-5 parts of poly N-isopropyl acrylamide hydrogel according to parts by weight;
(3) uniformly stirring cement, sand and half of the polypropylene fibers, adding the rest half of the polypropylene fibers, then adding water for slow stirring at the stirring speed of 600-800 rpm, stirring for 2.5-3 min, then adding the polycyclic aromatic sulfonate formaldehyde condensate, and then quickly stirring for 4-4.5 min at the stirring speed of 1500-1800 rpm;
(4) adding poly N-isopropyl acrylamide hydrogel, and rapidly stirring at a stirring speed of 1500-1800 rpm for 3-3.5 min to obtain the concrete.
The concrete was poured into a 160mm x 40mm triplex mold for performance testing.
The performance test results of the concrete prepared in examples 1 to 3 and comparative examples 1 to 3 are compared as follows:
as can be seen from the above table, the disturbance resistant concrete prepared by the method of the invention can still maintain higher compressive strength under the disturbed condition, no crack appears on the surface after severe vibration, and the disturbance resistance is good.
The embodiments described above are described to facilitate an understanding and use of the invention by those skilled in the art. It will be readily apparent to those skilled in the art that various modifications to these embodiments may be made, and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the above embodiments, and those skilled in the art should make improvements and modifications within the scope of the present invention based on the disclosure of the present invention.
Claims (10)
1. The disturbance-resistant concrete is characterized by comprising the following components in parts by weight: 12-18 parts of cement, 64-69 parts of sand, 3-6 parts of silica fume, 0.3-0.6 part of fiber, 0.2-0.4 part of water reducing agent, 6.5-8.5 parts of water and 2-5 parts of temperature-sensitive hydrogel.
2. The disturbance-resistant concrete according to claim 1, wherein the temperature-sensitive hydrogel is a poly-N-isopropylacrylamide hydrogel.
3. The disturbance-resistant concrete according to claim 2, wherein the polymerization degree of the poly-N-isopropylacrylamide hydrogel is 3-9.
4. The disturbance-resistant concrete according to claim 2, wherein the poly-N-isopropylacrylamide is obtained by reacting an N-isopropylacrylamide monomer under the action of an initiator and a crosslinking agent.
5. The disturbance-resistant concrete according to claim 4, wherein the molar ratio of the N-isopropylacrylamide monomer to the initiator to the crosslinking agent is 4.32-4.44: 0.83-0.85: 1; the reaction temperature is 25-30 ℃, the reaction time is 2-2.5 h, the reaction is carried out in deionized water, and the mass ratio of the N-isopropylacrylamide monomer to the deionized water is 0.001-0.0015: 1.
6. The disturbance-resistant concrete according to claim 1, wherein the fibers comprise steel fibers, polyvinyl alcohol fibers or polypropylene fibers.
7. The disturbance-resistant concrete according to claim 1, wherein the sand has a particle size in the range of 5-18 mm; the particle size range of the silica fume is 0.1-0.42 mu m.
8. The disturbance-resistant concrete according to claim 1, wherein the water reducing agent comprises naphthalene sulfonate formaldehyde condensate, calcium lignosulfonate, or polycyclic aromatic sulfonate formaldehyde condensate.
9. A preparation method of disturbance resistant concrete according to any one of claims 1 to 8, which specifically comprises the following steps:
(1) weighing the components in parts by weight;
(2) uniformly stirring cement, sand, silica fume and half of fibers, adding the rest half of fibers, then adding water for slow stirring, adding a water reducing agent after stirring for a period of time, and then quickly stirring for a period of time;
(3) adding temperature-sensitive hydrogel, and rapidly stirring for a period of time to obtain the disturbance-resistant concrete.
10. The method for preparing the disturbance resistant concrete according to claim 9, wherein the slow stirring speed in the step (2) is 600-800 rpm, the slow stirring time is 2.5-3 min, the fast stirring speed is 1500-1800 rpm, and the fast stirring time is 4-4.5 min; the rapid stirring speed in the step (3) is 1500-1800 rpm, and the rapid stirring time is 3-3.5 min.
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