1. The cement concrete pavement patching material is characterized by being mainly prepared from the following raw materials in parts by weight: 48-52 parts of Portland cement, 7-10 parts of cement admixture, water: 17-19 parts of resin powder, 0.7-0.9 part of coarse aggregate, 280-320 parts of tailing powder: 120-160 parts; 0.12-0.36 parts of fiber, an early strength agent: 2-5 parts.

2. A cement concrete pavement patching material as claimed in claim 1, wherein: the cement additive comprises kaolinite type pyrite flotation tailing, and the kaolinite type pyrite flotation tailing is calcined for 1-1.5 hours at 750 ℃, and then ground for 2-3 hours to prepare powder.

3. A cement concrete pavement patching material as claimed in claim 2, wherein: the resin adhesive powder comprises one or more of ultrahigh molecular weight polyethylene powder and ethylene-vinyl acetate copolymer adhesive powder, redispersible adhesive powder, mortar adhesive powder and urea-formaldehyde resin adhesive powder, and the weight ratio of the mixture is 2: 3.

4. a cement concrete pavement patching material as claimed in claim 3, wherein: the early strength agent is calcium gluconate and calcium formate with the weight ratio of 1: 3.

5. A cement concrete pavement patching material as claimed in claim 4, wherein: the aggregate is prepared by the following method: weighing certain mass of tailing powder, cement, water, a beta sodium naphthalene sulfonate formaldehyde condensate water reducer and inorganic rubber powder, wherein the weight ratio of the tailing powder to the cement to the water to the beta sodium naphthalene sulfonate formaldehyde condensate water reducer is 5: 1: 2: 0.2: 0.03; and then, dry-mixing and mixing the tailing powder and the cement in proportion, adding water for wet mixing after uniform mixing, adding a beta sodium naphthalenesulfonate formaldehyde condensate water reducer and inorganic rubber powder after uniform stirring, and then putting the mixture into a centrifugal roller to rotate for 30-45 min at the rotating speed of 15-20 r/min to prepare the aggregate serving as tailing balls.

6. A cement concrete pavement patching material as claimed in claim 5, wherein: the fiber comprises one or more of polypropylene fiber, polyacrylonitrile fiber and polyvinyl alcohol fiber, and is mixed with steel fiber, and the weight ratio is 2: 1.

7. A process for the preparation of a cementitious concrete pavement patching material as claimed in claim 6, characterized by comprising the following steps:

preparing coarse aggregate: weighing certain mass of tailing powder, cement, water, a beta sodium naphthalene sulfonate formaldehyde condensate water reducer and inorganic rubber powder, wherein the weight ratio of the tailing powder to the cement to the water to the beta sodium naphthalene sulfonate formaldehyde condensate water reducer is 5: 1: 2: 0.2: 0.03; firstly, dry-mixing and mixing the tailing powder and the cement in proportion, adding water for wet mixing after uniform mixing, adding a beta sodium naphthalenesulfonate formaldehyde condensate water reducer and inorganic rubber powder after uniform stirring, and then putting the mixture into a centrifugal roller to rotate for 30-45 min at the rotating speed of 15-20 r/min to prepare tailing balls serving as aggregates;

weighing 48-52 parts of Portland cement, 7-10 parts of cement additives, 17-19 parts of water, 0.7-0.9 part of resin powder, 280-320 parts of coarse aggregate and tailing powder: 120-160 parts; and (3) 0.12-0.36 part of fiber is placed in a stirrer to be stirred, 2-5 parts of early strength agent is added in the stirring process, and the repairing material is obtained after uniform mixing.

8. A method for repairing a pavement of a cement concrete pavement patching material, comprising the pavement patching material prepared by the preparation process of claim 7, and comprising the steps of:

taking cracks or damaged parts of the cement concrete pavement as centers, knocking off loose concrete blocks due to floating, removing the concrete blocks and sundries in the pit grooves, vertically cutting downwards at a position 6-10cm inwards along the side walls of the pit grooves, flatly cleaning the side walls and the bottom surfaces of the grooves, ensuring that the side walls are vertical and the depth of the pit grooves is not less than 6cm, pouring the repairing material into the pit grooves, closely inserting and vibrating the repairing material, leveling the repairing material to be flush with the original cement concrete pavement, maintaining the repairing material under natural conditions, and filling the repairing material by adopting a layered pouring mode, a layered inserting and vibrating mode when the depth of the pit grooves is more than 20 cm.

Background

Road maintenance has long been one of the important issues in the field of road engineering. The cement concrete pavement is a high-grade pavement structure form with higher importance and larger proportion, is an engineering composite material formed by mixing cement, sand, stone and the like with water into a whole, and has the advantages of water resistance, good durability, high rigidity, strong bearing capacity and the like. However, with the increasing of road surface overload and traffic volume, cracks, broken plates and damages of different degrees can be generated in the using process, if the repair treatment is not performed in time, the condition is increasingly serious under the repeated rolling of vehicles, the driving safety is affected, and even traffic accidents are caused. The cost of digging and re-paving is too high, and a repairing method is generally adopted. In addition, nowadays, energy conservation and environmental protection are increasingly emphasized, and the preparation of the repair material with excellent performance, energy conservation and environmental protection is very important.

The traditional repairing materials are roughly divided into organic materials and inorganic materials, the organic repairing materials are mainly asphalt or resin materials, although the organic repairing materials have high bonding strength and good corrosion resistance and impermeability, the difference of the shrinkage and expansibility of the organic repairing materials and the concrete materials is large, the repairing difficulty is large, and the cost is high. The inorganic repairing material is generally a special cement-doped early strength agent, is used for repairing a cement concrete pavement, has high compressive strength, low tensile strength and poor durability, and is easy to generate secondary damage. In view of the above, various cement concrete pavement repair materials such as fiber concrete and polymer concrete have appeared in the present year, and although some repair materials have good repair performance, the requirements of energy saving and environmental protection are not met. For example, patent CN106892630A discloses a cement concrete pavement patching material and a preparation method thereof, because fine sand is only selected as aggregate, the prepared patching material has low compressive strength, and high alumina cement needs to be added in the preparation process, the preparation process of the high alumina cement is very complicated, the cost is high, and the material is not economical and environment-friendly. The cement concrete pavement patching material disclosed in patent CN104045291A takes portland cement and sulphoaluminate cement as cementing materials, and although the prepared patching material has strong compressive strength and long-term stability, the coarse aggregate is continuous graded broken stone with the particle size of 4-10 mm, which is not beneficial to relieving the pressure of mineral resources. And steel fiber is required to be added to enhance the crack resistance of the steel fiber, so that the cost is high.

Disclosure of Invention

Aiming at the problems, the cement concrete pavement repairing material is energy-saving, environment-friendly and excellent in performance from the perspective of relieving resource and energy constraints and reducing the pressure of the ecological environment. In addition, the method is realized by the following technical method:

the cement concrete pavement patching material is mainly prepared from the following raw materials in parts by weight: 48-52 parts of Portland cement, 7-10 parts of cement admixture, and water: 17-19 parts of resin powder, 0.7-0.9 part of coarse aggregate, 280-320 parts of tailing powder: 120-160 parts; 0.12-0.36 parts of fiber, an early strength agent: 2-5 parts.

Wherein: the cement additive comprises kaolinite type pyrite flotation tailing, and the kaolinite type pyrite flotation tailing is calcined for 1-1.5 hours at 750 ℃, and then ground for 2-3 hours to prepare powder.

Wherein: the resin adhesive powder comprises one or more of ultrahigh molecular weight polyethylene powder and ethylene-vinyl acetate copolymer adhesive powder, redispersible adhesive powder, mortar adhesive powder and urea-formaldehyde resin adhesive powder, and the weight ratio of the mixture is 2: 3.

wherein: the early strength agent is calcium gluconate and calcium formate with the weight ratio of 1: 3.

Wherein: the aggregate is prepared by the following method: weighing certain mass of tailing powder, cement, water, a beta sodium naphthalene sulfonate formaldehyde condensate water reducer and inorganic rubber powder, wherein the weight ratio of the tailing powder to the cement to the water to the beta sodium naphthalene sulfonate formaldehyde condensate water reducer is 5: 1: 2: 0.2: 0.03; and then, dry-mixing and mixing the tailing powder and the cement in proportion, adding water for wet mixing after uniform mixing, adding a beta sodium naphthalenesulfonate formaldehyde condensate water reducer and inorganic rubber powder after uniform stirring, and then putting the mixture into a centrifugal roller to rotate for 30-45 min at the rotating speed of 15-20 r/min to prepare the aggregate serving as tailing balls.

Wherein: the fiber comprises one or more of polypropylene fiber, polyacrylonitrile fiber and polyvinyl alcohol fiber, and is obtained by mixing with steel fiber in a weight ratio of 2: 1;

the preparation process of the cement concrete pavement patching material comprises the following steps:

preparing coarse aggregate: weighing certain mass of tailing powder, cement, water, a beta sodium naphthalene sulfonate formaldehyde condensate water reducer and inorganic rubber powder, wherein the weight ratio of the tailing powder to the cement to the water to the beta sodium naphthalene sulfonate formaldehyde condensate water reducer is 5: 1: 2: 0.2: 0.03; firstly, dry-mixing and mixing the tailing powder and the cement in proportion, adding water for wet mixing after uniform mixing, adding a beta sodium naphthalenesulfonate formaldehyde condensate water reducer and inorganic rubber powder after uniform stirring, and then putting the mixture into a centrifugal roller to rotate for 30-45 min at the rotating speed of 15-20 r/min to prepare tailing balls serving as aggregates;

weighing 48-52 parts of Portland cement, 7-10 parts of cement additives, 17-19 parts of water, 0.7-0.9 part of resin powder, 280-320 parts of coarse aggregate and tailing powder: 120-160 parts; and (3) 0.12-0.36 part of fiber is placed in a stirrer to be stirred, 2-5 parts of early strength agent is added in the stirring process, and the repairing material is obtained after uniform mixing.

The pavement repairing method of the cement concrete pavement repairing material comprises the pavement repairing material prepared by the preparation process, and comprises the following steps:

taking cracks or damaged parts of the cement concrete pavement as centers, knocking off loose concrete blocks due to floating, clearing away the concrete blocks and sundries in the pit grooves, vertically cutting downwards at a position 6-10cm inwards along the side walls of the pit grooves, flatly clearing the side walls and the bottom surfaces of the grooves, ensuring that the side walls are vertical and the depth of the pit grooves is not less than 6cm, pouring the repairing material into the pit grooves, closely inserting and vibrating the repairing material, leveling the repairing material to be flush with the original cement concrete pavement, maintaining the repairing material under natural conditions, and filling the repairing material by adopting a layered pouring mode, a layered inserting and vibrating mode when the depth of the pit grooves is more than 20 cm.

Compared with the prior art, the invention has the following technical effects:

(1) in the past 50 years, with the development of mineral resources, hundreds of millions of tons of tailings are generated, and because the tailings are not fully utilized, the tailings have adverse effects on the environment, the tailings are used as raw materials, are calcined and ground at high temperature to a certain fineness and then are used as cement additives and high-performance concrete additives, and have high volcanic activity, and the activity index is up to 120%;

(2) the tailing ball is prepared by taking tailing powder, cement, water, a beta sodium naphthalene sulfonate formaldehyde condensate water reducer and inorganic rubber powder as raw materials, and the experimental detection shows that the prepared tailing ball meets the relevant requirements of recycled aggregate in concrete recycled coarse aggregate (GB/T25177-2010), and the tailing ball prepared by utilizing the tailing powder has huge market demand as the concrete recycled aggregate, so that better economic benefit and environmental benefit can be obtained.

(3) The addition of the resin adhesive powder enhances the bonding capability of the repairing material at the interface of the new concrete and the old concrete, improves the bonding strength, and has good freeze-thaw damage resistance; the composite fiber formed by compounding the polymer fiber and the steel fiber is selected, so that the breaking strength, crack resistance and impact resistance of the material are improved; calcium gluconate and calcium formate are selected as early strength agents, so that the repair material has the characteristics of quick hardening and early strength, the traffic can be opened after 12-24 hours of construction, long-time maintenance is not needed, and the working efficiency is high.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are a part of the embodiments of the present invention, but not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The repair material is mainly prepared from the following raw materials in parts by weight: 48-52 parts of Portland cement, 7-10 parts of cement admixture, and water: 17-19 parts of resin powder, 0.7-0.9 part of coarse aggregate, 280-320 parts of tailing powder: 120-160 parts; 0.12-0.36 parts of fiber, an early strength agent: 2-5 parts.

The cement additive comprises kaolinite type pyrite flotation tailing, and is calcined for 1-1.5 hours at 750 ℃, and ground for 2-3 hours to prepare powder. The invention takes tailings as raw materials, and the tailings are calcined and ground at high temperature to a certain fineness to be used as cement admixtures and high-performance concrete admixtures, which have high volcanic activity and the activity index of up to 120%.

The resin adhesive powder comprises one or more of ultrahigh molecular weight polyethylene powder and ethylene-vinyl acetate copolymer adhesive powder, redispersible adhesive powder, mortar adhesive powder and urea-formaldehyde resin adhesive powder, and the weight ratio of the mixture is 2: 3. the redispersible rubber powder can be selected from 8010 rubber powder and 8020 rubber powder.

The early strength agent is calcium gluconate and calcium formate with the weight ratio of 1: 3.

The fiber comprises one or more of polypropylene fiber, polyacrylonitrile fiber and polyvinyl alcohol fiber mixed with steel fiber, and the weight ratio is 2: 1.

The addition of the resin adhesive powder enhances the bonding capability of the repairing material at the interface of the new concrete and the old concrete, improves the bonding strength, and has good freeze-thaw damage resistance; the composite fiber formed by compounding the polymer fiber and the steel fiber is selected, so that the breaking strength, crack resistance and impact resistance of the material are improved; calcium gluconate and calcium formate are selected as early strength agents, so that the repair material has the characteristics of quick hardening and early strength, the traffic can be opened after 12-24 hours of construction, long-time maintenance is not needed, and the working efficiency is high.

The aggregate is prepared by the following method: weighing certain mass of tailing powder, cement, water, a beta sodium naphthalene sulfonate formaldehyde condensate water reducer and inorganic rubber powder, wherein the weight ratio of the tailing powder to the cement to the water to the beta sodium naphthalene sulfonate formaldehyde condensate water reducer is 5: 1: 2: 0.2: 0.03; and then, dry-mixing and mixing the tailing powder and the cement in proportion, adding water for wet mixing after uniform mixing, adding a beta sodium naphthalenesulfonate formaldehyde condensate water reducer and inorganic rubber powder after uniform stirring, and then putting the mixture into a centrifugal roller to rotate for 30-45 min at the rotating speed of 15-20 r/min to prepare the aggregate serving as tailing balls.

The tailing ball is prepared by taking tailing powder, cement, water, a beta sodium naphthalene sulfonate formaldehyde condensate water reducer and inorganic rubber powder as raw materials, tests show that the prepared tailing ball meets the relevant requirements of recycled aggregate in recycled coarse aggregate for concrete (GB/T25177-2010), the tailing ball prepared by utilizing the tailing powder has huge market demand as the recycled aggregate for concrete, and better economic benefit and environmental benefit can be obtained

The preparation process comprises the following steps:

preparing coarse aggregate: weighing certain mass of tailing powder, cement, water, a beta sodium naphthalene sulfonate formaldehyde condensate water reducer and inorganic rubber powder, wherein the weight ratio of the tailing powder to the cement to the water to the beta sodium naphthalene sulfonate formaldehyde condensate water reducer is 5: 1: 2: 0.2: 0.03; firstly, dry-mixing and mixing the tailing powder and the cement in proportion, adding water for wet mixing after uniform mixing, adding a beta sodium naphthalenesulfonate formaldehyde condensate water reducer and inorganic rubber powder after uniform stirring, and then putting the mixture into a centrifugal roller to rotate for 30-45 min at the rotating speed of 15-20 r/min to prepare tailing balls serving as aggregates;

weighing 48-52 parts of Portland cement, 7-10 parts of cement additives, 17-19 parts of water, 0.7-0.9 part of resin powder, 280-320 parts of coarse aggregate and tailing powder: 120-160 parts; and (3) 0.12-0.36 part of fiber is placed in a stirrer to be stirred, 2-5 parts of early strength agent is added in the stirring process, and the repairing material is obtained after uniform mixing.

The method for repairing the pavement comprises the pavement repairing material prepared by the preparation process, and comprises the following steps:

taking cracks or damaged parts of the cement concrete pavement as centers, knocking off loose concrete blocks due to floating, clearing away the concrete blocks and sundries in the pit grooves, vertically cutting downwards at a position 6-10cm inwards along the side walls of the pit grooves, flatly clearing the side walls and the bottom surfaces of the grooves, ensuring that the side walls are vertical and the depth of the pit grooves is not less than 6cm, pouring the repairing material into the pit grooves, closely inserting and vibrating the repairing material, leveling the repairing material to be flush with the original cement concrete pavement, maintaining the repairing material under natural conditions, and filling the repairing material by adopting a layered pouring mode, a layered inserting and vibrating mode when the depth of the pit grooves is more than 20 cm.

Portland cement: whelk PII 52.5(R),

example 1

Preparing coarse aggregate: weighing certain mass of tailing powder, cement, water, a beta sodium naphthalene sulfonate formaldehyde condensate water reducer and inorganic rubber powder, wherein the weight ratio of the tailing powder to the cement to the water to the beta sodium naphthalene sulfonate formaldehyde condensate water reducer is 5: 1: 2: 0.2: 0.03. firstly, dry-mixing and mixing the tailing powder and the cement in proportion, adding water for wet mixing after uniform mixing, adding a beta sodium naphthalenesulfonate formaldehyde condensate water reducer and inorganic rubber powder after uniform stirring, and then putting the mixture into a centrifugal roller to rotate for 30min at the rotating speed of 15r/min to prepare the tailing ball serving as the aggregate. Soaking for 0.5 h.

Weighing 48 parts of conch PII 52.5(R) silicate cement and 7 parts of cement admixture, wherein the cement admixture comprises kaolinite type pyrite flotation tailing ore, calcining the kaolinite type pyrite flotation tailing ore at 750 ℃ for 1 to 1.5 hours, grinding the kaolinite type pyrite flotation tailing ore for 2 to 3 hours to prepare powder, 17 parts of water and 0.7 part of resin rubber powder, and the resin rubber powder comprises one or more of ultrahigh molecular weight polyethylene powder, ethylene-vinyl acetate copolymer rubber powder, 8010.20 rubber powder, 8020 rubber powder, mortar rubber powder and urea-formaldehyde resin rubber powder, and the weight ratio of the mixture is 2: 3, preferably, the composition ratio of Wanwei 8010 rubber powder to Wanwei 8020 rubber powder is 2: 3, 280 parts of coarse aggregate, 120 parts of tailing powder and 0.12 part of fiber, wherein the fiber comprises (polypropylene fiber and polyacrylonitrile fiber) and steel fiber which are mixed according to the weight ratio of (1.3+0.7) to 1, the mixture is placed in a stirrer to be stirred, 2 parts of early strength agent is added in the stirring process, the early strength agent comprises calcium gluconate and calcium formate according to the weight ratio of 1:3, and the repairing material is obtained after uniform mixing;

the method for repairing the pavement comprises the following steps: taking a crack or a damaged part of the cement concrete pavement as a center, and knocking off the loose concrete blocks in the virtual floating way; and removing concrete blocks and sundries in the pit, vertically cutting downwards along the side wall of the pit to the position 6cm inwards, flatly cleaning the side wall and the bottom surface of the groove, and ensuring that the side wall is vertical and the depth of the pit is not less than 6 cm. And pouring the repairing material into the pit slot, closely tamping or vibrating, leveling and leveling the repairing material to be flush with the original cement concrete pavement, and maintaining the repairing material under natural conditions.

Example 2

Preparing coarse aggregate: weighing certain mass of tailing powder, cement, water, a beta sodium naphthalene sulfonate formaldehyde condensate water reducer and inorganic rubber powder, wherein the weight ratio of the tailing powder to the cement to the water to the beta sodium naphthalene sulfonate formaldehyde condensate water reducer is 5: 1: 2: 0.2: 0.03. firstly, dry-mixing and mixing the tailing powder and the cement in proportion, adding water for wet mixing after uniform mixing, adding a beta sodium naphthalenesulfonate formaldehyde condensate water reducer and inorganic rubber powder after uniform stirring, and then putting the mixture into a centrifugal roller to rotate for 38min at the rotating speed of 17r/min to prepare the tailing ball serving as the aggregate. Soaking for 0.71 h.

Weighing 50 parts of conch PII 52.5(R) portland cement, 8 parts of cement admixture, 18 parts of water, 0.8 part of resin powder, 300 parts of coarse aggregate and tailing powder: 140 parts of (B); 0.24 part of fiber is put into a stirrer to be stirred, 3 parts of early strength agent is added in the stirring process, and the repairing material is obtained after even mixing; wherein the components of the resin adhesive powder, the cement admixture, the resin adhesive powder and the fiber are the same as those in the embodiment 1, and the composition proportion is also consistent;

the method for repairing the pavement comprises the following steps: cutting vertically downwards at the position of 8cm to the inner side along the side wall of the pit groove, and performing the other steps in the same way as in the embodiment 1;

example 3

Preparing coarse aggregate: weighing certain mass of tailing powder, cement, water, a beta sodium naphthalene sulfonate formaldehyde condensate water reducer and inorganic rubber powder, wherein the weight ratio of the tailing powder to the cement to the water to the beta sodium naphthalene sulfonate formaldehyde condensate water reducer is 5: 1: 2: 0.2: 0.03. firstly, dry-mixing and mixing the tailing powder and the cement in proportion, adding water for wet mixing after uniform mixing, adding a beta sodium naphthalenesulfonate formaldehyde condensate water reducer and inorganic rubber powder after uniform stirring, and then putting the mixture into a centrifugal roller to rotate for 45min at the rotating speed of 20r/min to prepare the tailing ball serving as the aggregate. Soaking for 1h for use.

Weighing 52 parts of conch PII 52.5(R) portland cement, 10 parts of cement admixture, 19 parts of water, 0.9 part of resin powder, 320 parts of coarse aggregate and tailings powder: 160 parts of (B); 0.36 part of fiber is put into a stirrer to be stirred, 5 parts of early strength agent is added in the stirring process, and the repairing material is obtained after even mixing; wherein the components of the resin rubber powder, the cement admixture, the resin rubber powder and the fiber are the same as those in the embodiment 1, and the composition proportion is also consistent.

The method for repairing the pavement comprises the following steps: cutting vertically downwards along the position of 10cm inward of the side wall of the pit groove, and performing the other steps in the same way as in example 1;

and (3) performance detection:

the repair materials prepared in examples 1, 2 and 3 were tested according to the test protocol JTG 3420-2020 of Highway engineering Cement and Cement concrete. Testing the slump, the setting time and the compressive strength under the same-condition curing according to the specification JTG 3420-2020 as required, wherein the specific data are shown in the following table 5:

TABLE 5 performance test results for repair materials

As can be seen from Table 5, the energy-saving and environment-friendly cement concrete pavement patching material of the embodiments 1 to 3 has the initial setting time of about 35min and the final setting time of about 56min, and the compressive strength of 12h reaches more than 43MPa, which indicates that the patching material has high compressive strength and is fast and early-strong, and the traffic can be opened after 12 to 24h of construction.

Although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.