CN114150840A - Anti-seepage repairing method for floor hardening - Google Patents
Anti-seepage repairing method for floor hardening Download PDFInfo
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- CN114150840A CN114150840A CN202111231768.6A CN202111231768A CN114150840A CN 114150840 A CN114150840 A CN 114150840A CN 202111231768 A CN202111231768 A CN 202111231768A CN 114150840 A CN114150840 A CN 114150840A
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04F—FINISHING WORK ON BUILDINGS, e.g. STAIRS, FLOORS
- E04F15/00—Flooring
- E04F15/12—Flooring or floor layers made of masses in situ, e.g. seamless magnesite floors, terrazzo gypsum floors
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04F—FINISHING WORK ON BUILDINGS, e.g. STAIRS, FLOORS
- E04F15/00—Flooring
- E04F15/18—Separately-laid insulating layers; Other additional insulating measures; Floating floors
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04F—FINISHING WORK ON BUILDINGS, e.g. STAIRS, FLOORS
- E04F2290/00—Specially adapted covering, lining or flooring elements not otherwise provided for
- E04F2290/04—Specially adapted covering, lining or flooring elements not otherwise provided for for insulation or surface protection, e.g. against noise, impact or fire
Abstract
The invention provides a method for repairing hardened terrace with seepage prevention, which belongs to the technical field of constructional engineering and comprises the following steps: base layer treatment, lime soil cushion layer construction, concrete layer construction, mortar layer construction and anticorrosion surface layer construction; an impermeable layer is arranged between the lime soil cushion layer and the concrete layer; c30 fine stone concrete is laid on the concrete layer, and the flatness is controlled to be not more than 3mm in height difference; epoxy mortar is paved on the mortar layer, and the thickness is 20-50 mm; the anti-corrosion surface layer adopts a construction scheme of epoxy glass fiber reinforced plastic three cloth five oil. The repairing method provided by the invention can prevent liquid and chemical media from corroding the terrace structure by arranging multiple interlayers with good interlayer bonding degree and good seepage-proofing effect, can adapt to larger foundation deformation, reduces terrace settlement, has good service durability, and is suitable for repairing seepage-proofing and corrosion-proofing hardened terraces with large foundation difference deformation and heavy load.
Description
Technical Field
The invention relates to the technical field of constructional engineering, in particular to a seepage-proofing repairing method for hardened terrace.
Background
The terrace is a ground which is constructed and treated by using specific materials and processes and presents certain decoration and functionality, and is suitable for onePlaces with higher ground requirements, such as hospital ground, workshop ground of food or pharmaceutical factory, experimental building ground, machine room ground and the like; impact-resistant, corrosion-resistant and wear-resistant ground such as underground parking lots, factory storehouses and the like is required. According to the national environmental protection requirement, the underground water pollution should be prevented to general industrial pollution place, consider to take prevention of seepage to handle the terrace: the anti-seepage performance index is that the permeability coefficient is less than 1.0 multiplied by 10-7cm/s。
In the chemical production process, production area and storage area all have leakage and waste liquid waste water discharge, harden prevention of seepage and handle to the terrace and can prevent leakage liquid and waste liquid waste water etc. seepage to the underground, and then corrode the steel column basis in the ground, bring the destruction for factory building structural safety, influence factory building structural strength and the long period steady operation of device. Meanwhile, the pollution of the soil caused by the leakage of pollutants can be avoided, and further the serious threat to the ecological balance and the human health is caused, so that the soil becomes a new environmental pollution source. Meanwhile, large-scale equipment is involved in production, and the terrace where the equipment is located must be a terrace capable of bearing large load.
Usually, the construction of the plant area adopts a concrete terrace or a reinforced concrete structure. The concrete is easy to crack due to shrinkage, temperature difference change and other reasons in construction, so that the strength of the floor surface is weakened, and after long-term use, the abrasion and even the fracture of the floor surface can be accelerated; in production, the terrace structure bears higher pressure, more frequent mechanical damage, more severe chemical corrosion and the like, so that the terrace is easy to damage, and even the phenomena of plate breakage, dislocation and mud extrusion occur. Considering the requirement of environmental protection, in order to avoid pollution caused by chemical leakage, the terrace needs to be repaired in time when being damaged. However, in actual repair, due to the poor bonding force between the repair material and the original structure, the repair material cannot withstand severe chemical corrosion, the foundation is not firm, the repair structure is deformed, or the repair material cannot reach the optimal strength, i.e., the repair material is put into use, and the like, and the repair area is generally difficult to maintain for a long time. Therefore, the method causes repeated repair, brings troubles to a plurality of enterprises, seriously influences normal production and brings great potential safety hazard. Therefore, the method for repairing the terrace which can bear the load of the large-scale equipment and prevent the leakage of the waste liquid must be considered, so that the safety of the terrace structure and the damage to the ecological environment can be ensured.
Disclosure of Invention
The invention provides a method for repairing hardened terrace with seepage prevention, which is used for solving the problems of poor bonding force between a repairing material and an original structure, poor seepage prevention and corrosion prevention effects and poor durability. The repairing method has the advantages that the interlayer with good bonding degree and good seepage-proofing effect among multiple layers is arranged, so that the corrosion of liquid and chemical media to the terrace structure can be prevented, the method can adapt to larger foundation deformation, the terrace settlement is reduced, the service durability is good, and the method is suitable for repairing the seepage-proofing, corrosion-proofing and hardening terrace with large foundation difference deformation and heavy load.
Specifically, the invention provides a method for repairing hardened terrace with seepage prevention, which comprises the following steps: base layer treatment, lime soil cushion layer construction, concrete layer construction, mortar layer construction and anticorrosion surface layer construction; an impermeable layer is arranged between the lime soil cushion layer and the concrete layer; c30 fine stone concrete is laid on the concrete layer, and the flatness is controlled to be not more than 3mm in height difference; epoxy mortar is paved on the mortar layer, and the thickness is 20-50 mm; the anti-corrosion surface layer adopts a construction scheme of epoxy glass fiber reinforced plastic three cloth five oil.
According to the restoration method in the technical scheme, the multiple interlayers are arranged to form a flat surface and a compact interlayer structure, and each interlayer has an anti-seepage effect and can isolate the liquid leakage waste liquid on the surface of the terrace from the surface soil layer, so that pollutants are prevented from polluting soil and water under the foundation, the anti-seepage effect is good, the liquid and chemical media can be prevented from corroding the terrace structure, and the adaptive deformability is strong.
In a specific embodiment, the base course treatment comprises a step of breaking the damaged original terrace structure, wherein the breaking depth is not less than 420-700mm below the surface layer of the original terrace structure. The purpose of cleaning the surface is not to affect the quality of the bond between the substrate and the dirt layer. The original terrace is broken, dislocated, settled, large gaps and the like, so that the further development of breakage is prevented, and the functions of preventing infiltration and preventing fouling are achieved.
In the specific implementation scheme, the tamped pseudo-ginseng gray soil is paved on the gray soil cushion layer, the paving total thickness is 300-450mm, the tamping is carried out in 2-3 layers, the thickness of each layer is 150mm, and the compaction coefficient is more than or equal to 0.97. The soil of basic unit can be consolidated as the substructure of terrace to the lime soil bed course, and high compaction coefficient has then guaranteed the high strength of lime soil, can reduce the terrace structure and subside to prevent the seepage.
In a specific embodiment, the impermeable layer is paved with an impermeable membrane with the thickness of 0.5-1.5mm, and the impermeable membrane adopts a geomembrane made of polyethylene materials. The impermeable layer has the advantages of moisture-proof, waterproof and impermeable isolation functions, capability of effectively avoiding impermeable blind spots, high water-blocking reliability, better corrosion resistance and deformation resistance and capability of adapting to larger foundation deformation.
In a specific embodiment, the concrete layer is laid to a thickness of 100-200 mm. The concrete layer is a rigid bearing layer, a compact interlayer structure is formed after hardening treatment, the bearing and pressure-bearing effects are achieved, the pressure resistance, the shock resistance and the weather resistance of the terrace are improved, the settlement of the terrace can be further reduced, and the long-term protection effect is guaranteed.
In a specific embodiment, the raw materials of the C30 fine-grained concrete comprise the following components in parts by weight: 350 parts of 250-350 parts of portland cement, 1100 parts of continuous graded broken stone of 800-1100 parts of 700-950 parts of river sand, 50-75 parts of fly ash, 6-8 parts of a water reducing agent and 190 parts of water of 140-140 parts of sand.
The components in the C30 fine stone concrete raw material play a synergistic role, the filling is realized in the concrete cementing material by utilizing the difference of the particle sizes of the components, the gaps among the particles of the components are reduced, the total surface area and the void ratio of the prepared concrete mixture are proper, the vibrated concrete is more compact, and the impermeability, the corrosion resistance and the strength of a concrete layer are obviously improved.
Further setting the grain diameter of the continuous graded broken stone to be 5-15 mm; the river sand is hard clean natural river sand, and the fineness modulus is 2.6-3.0; the water reducing agent is a polycarboxylate water reducing agent.
In a specific embodiment, the epoxy mortar comprises the following components in parts by weight: the water-based epoxy resin, the water-based epoxy curing agent, the water, the cement, the river sand and the accelerator are 1:1.3-1.5:3-5:10-13:25-30: 0.1-0.3.
The epoxy mortar can form a flat surface, and is quickly cured after being laid to form a compact mortar layer with excellent durability. The mortar layer has low permeability and excellent chemical medium corrosion resistance, and can ensure long-term protection effect. The epoxy mortar can also be used in cracks or connecting seam parts.
The accelerator further comprises a fatty amine accelerator, benzhydrylamine and triethylene glycol monomethyl ether in a weight ratio of 1:0.2-0.5: 0.1-0.5. The mutual cooperation of the accelerators can enable the water-based epoxy resin to form a compact three-dimensional cross-linked structure, so that the mortar layer has excellent mechanical properties such as wear resistance and rolling resistance. In addition, the benzhydrylamine and the triethylene glycol monomethyl ether can be mutually permeated with substances in a concrete layer by utilizing molecular chains and radicals, so that the bonding strength of an interface transition region can be improved, a mortar layer can be firmly attached to the concrete layer, and the compressive strength is improved; the mutual permeation is also beneficial to sealing capillary pores inside the concrete layer or the mortar layer after curing, further reduces the permeability, further improves the chlorine ion pollution resistance, and enhances the corrosion resistance and the impermeability of the concrete layer, the mortar layer and the repair structure in a high saline-alkali environment.
In a specific embodiment, the mortar layer construction is carried out after the bleeding on the surface of the concrete layer is removed and the initial setting state is achieved; the construction of the anti-corrosion surface layer is carried out after the surface of the epoxy mortar layer is initially set.
Through adopting above-mentioned technical scheme, interlayer interval construction lays next interlayer when the interlayer is preliminary solidification, can make interfacial interpenetration between the layer, bonding, can improve the bonding strength between the interlayer, and then improves the holistic performance of terrace.
The invention also provides a terrace hardening anti-seepage repair structure prepared by the method, which comprises a base layer, wherein the surface of the base layer is sequentially provided with a lime soil cushion layer, a concrete layer, a mortar layer and an anti-corrosion surface layer from bottom to top; an impermeable layer is arranged between the lime soil cushion layer and the concrete layer.
The repairing structure is provided with multiple anti-seepage and anti-corrosion interlayers, so that the production load requirement can be met, and disordered leakage of waste liquid can be prevented. The hardened anti-seepage repaired terrace can be well bonded with an original terrace structure, has the characteristics of good wear resistance, high strength, heavy pressure resistance, chemical medium erosion resistance, and excellent anti-seepage property and durability, and can provide a long-term protection effect.
The repairing method and the repairing structure provided by the invention can be suitable for large-scale factory buildings such as textile factories, electronic factories, pharmaceutical factories, automobile factories, precision instrument production workshops and the like, and large-area epoxy terrace construction places such as hospitals, aviation, aerospace bases, laboratories, supermarkets, parking lots and the like, and can play roles in hardening, seepage-proofing repairing, corrosion prevention and chemical medium corrosion prevention.
The repairing method provided by the invention realizes the following beneficial effects by arranging multiple anti-seepage and anti-corrosion interlayers:
1) the terrace repaired by the method has high leakage resistance level, low surface roughness of the terrace, multiple anti-seepage layer structures of the anti-seepage repairing structures, good adhesion degree between the interlayers, capability of adapting to larger foundation deformation and reducing terrace settlement, good ageing resistance and corrosion resistance and strong capability of adapting to foundation deformation.
2) The repairing method is convenient and simple to construct, short in period and easy to ensure the construction quality; the seepage-proofing repair structure is simple, the seepage-proofing effect is good, the seepage-proofing blind spot can be effectively avoided, the leakage of pollutants can be controlled, the pollutants are prevented from polluting water and soil under the foundation, the seepage-proofing and corrosion-proofing effects are realized, and the seepage-proofing repair structure is particularly suitable for repairing seepage-proofing hardened terraces with large foundation differential deformation and heavy loads.
3) The restored structure has good anti-permeability performance, high compressive strength and good use durability, the ground leakage can be prevented after the terrace is restored, the restored structure has excellent wear resistance and corrosion resistance, the production load requirement can be met, the foundation of the equipment is not easy to sink, the long-period stable operation of the equipment is ensured, and the disordered leakage of pollutants and waste liquid can be prevented.
4) The repairing material in the method has the advantages of excellent mechanical property, excellent curing property, good compatibility with an original terrace structure, good bonding performance, excellent chemical tolerance, basically flat large-area interface, excellent durability and ideal service life.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
FIG. 1 is a schematic view of a repair structure made by a repair method according to an embodiment of the present invention;
FIG. 2 is a schematic view of a repair structure made by the repair method according to another embodiment of the present invention.
Description of reference numerals: 8; an in-place terrace structure; 1, a base layer; 2, a lime soil cushion layer; 3, a concrete layer; 4, a mortar layer; 5, an anti-corrosion surface layer; 6, an impermeable layer; 7, surface layer.
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 are clearly and completely described below, 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 obtained by a person skilled in the art based on the embodiments of the present invention without any inventive step, also belong to the scope of protection of the present invention.
It is to be understood that in fig. 1 of the present invention, the orientations and positional relationships shown in the drawings are for convenience in describing the flow of the present invention only, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus are not to be considered as limiting the present invention.
Referring to fig. 1, the invention provides a method for repairing a hardened terrace with seepage prevention, which comprises the following steps: base layer treatment, lime soil cushion layer construction, concrete layer construction, mortar layer construction and anticorrosion surface layer construction; an impermeable layer is arranged between the lime soil cushion layer and the concrete layer.
The hardened anti-seepage repairing structure of the terrace repaired by the method comprises a base layer 1, wherein a lime soil cushion layer 2, a concrete layer 3, a mortar layer 4 and an anti-corrosion surface layer 5 are sequentially arranged on the surface of the base layer from bottom to top; an impermeable layer 6 is arranged between the lime soil cushion layer and the concrete layer. The repairing structure is arranged on the basis of the original terrace structure 8.
In a more specific embodiment, the base layer processing steps are as follows: and (3) breaking the damaged original terrace structure, cleaning concrete fragments, floating dust, sludge and the like, compacting the base layer of the part to be filled, and carrying out surface treatment to be smooth.
In a more specific embodiment, the lime soil pad construction steps are as follows: and (3) paving the tamped pseudo-ginseng gray soil on the surface of the base layer, and ensuring that the compaction coefficient is more than or equal to 0.97 to obtain a gray soil cushion layer with a smooth surface.
Furthermore, the volume ratio of slaked lime and clay adopted by the pseudo-ginseng soil is 3:7, the particle size of the clay is not more than 15mm, and the particle size of the slaked lime is not more than 5 mm. The water content is controlled to be 20-23%. The notoginseng gray soil is mixed uniformly and has consistent color. After the construction of the lime soil cushion layer is completed, the next construction should be carried out in time, if the construction cannot be completed, temporary covering should be carried out on the surface in time, and the sun and rain are avoided.
In a more specific embodiment, the concrete layer construction steps are as follows: and paving an impermeable film on the surface of the lime soil cushion layer to serve as an impermeable layer, paving a mixture of C30 fine stone concrete on the surface of the impermeable layer, vibrating and compacting, and controlling the flatness to be not more than 3mm in height difference to form a concrete layer.
In a more specific embodiment, the C30 fine-grained concrete is prepared by the steps of:
(1) firstly, dry-mixing the continuously graded broken stone, river sand and fly ash with 50% of the amount of Portland cement, then adding 50% of the amount of water, and then pre-mixing for 10-30min to obtain a pre-mixed material;
(2) and adding the water reducing agent, the balance of cement and water into the premixed material, and stirring in a double-roller forced stirrer for 20-30min to prepare the mixture of the C30 fine aggregate concrete.
In a more specific embodiment, the epoxy mortar is comprised of a 20-140 mesh grade of river sand. River sand has a smaller specific surface area and better workability, and is used for increasing the strength of a mortar system and improving the compactness of the system.
In a more specific embodiment, the aliphatic amine accelerator in the components of the epoxy mortar is DMP-30 or EP-184.
In a more specific embodiment, the epoxy mortar is prepared by the steps of:
(1) uniformly mixing a waterborne epoxy curing agent, water and an accelerant to obtain a component A;
(2) uniformly mixing cement and river sand to obtain a component B;
(3) and (2) mixing the water-based epoxy resin with the component A, fully stirring by using a low-cost stirrer until the mixture becomes milky white and uniform without viscous feeling during stirring, adding the component B into the mixture, and uniformly stirring again to obtain the epoxy mortar.
In a more specific embodiment, the epoxy glass fiber reinforced plastic three-cloth five-oil construction scheme specifically comprises the following steps: firstly painting an epoxy resin primer on the surface of the mortar layer, then painting a second epoxy resin primer, pasting a first layer of glass cloth on the primer, then painting a first epoxy resin finish paint, pasting a second layer of glass cloth on the primer, then painting a second epoxy resin finish paint, pasting a third layer of glass cloth on the primer, and finally painting a third epoxy resin finish paint, and completing acceptance check.
Further, the construction environment of epoxy glass fiber reinforced plastic three cloth five oil is as follows: the temperature is 15-30 ℃, and the relative humidity is less than 80%. Above-mentioned anticorrosive surface course forms the plane effect that the roughness is low on the terrace surface, improves the wearability of terrace, can also prevent liquid and chemical medium to the erosion of terrace structure, improves the anticorrosive effect of terrace.
In a more specific embodiment, the above-mentioned method for repairing floor with hardened anti-seepage material further comprises a step of maintenance. Specifically, the curing step is as follows: after the whole floor is hardened, the floor can be put into use after natural curing. The curing period is usually 7 days. During the curing period, water immersion, flying insects, dust and the like are prevented from entering within the first 6 hours, and people are prohibited from stepping, scraping hard objects and the like within 3-7 days. Maintenance can guarantee that each layer structure has suitable sclerosis condition, makes its intensity constantly increase, avoids moisture excessive evaporation, influences the intensity and the durability of terrace structure.
In other embodiments, the original terrace structure only has abrasion and cracks on the surface layer, and the abraded terrace and the cracks are repaired in advance, so that the cracks and the abrasion can be prevented from further developing, and the prevention and protection effects are achieved. Referring to fig. 2, the repaired floor hardening anti-seepage repair structure comprises a surface layer 7, wherein a mortar layer 4 and an anti-corrosion surface layer 5 are sequentially arranged on the surface of the surface layer from bottom to top; the crack is filled with epoxy mortar for the mortar layer 4.
Further, the repair method provided by the repair structure is as follows:
1) surface layer treatment: the surface of the original lawn structure, which is only severely worn, is cleaned by a wire brush, blown clean by compressed gas and moistened by sprinkling water, and the surface is used as a surface layer. If small cracks exist on the surface of the original terrace structure, performing crack expanding treatment on the cracks by using a concrete cutting machine, and expanding the cracks to 20 mm; after the crack expansion is finished, blowing the inside of the crack by adopting compressed gas, and cleaning by using clear water; and then, pouring the epoxy mortar into the crack gap, and after the epoxy mortar is initially set, performing troweling treatment to keep the whole surface layer flat and integrated. The pressure of the compressed gas is 6MPa of nitrogen.
2) And (3) construction of a mortar layer: before construction, the chips, impurities and water on the surface layer are swept and cleaned by compressed gas, and then epoxy mortar with the thickness of 20-50mm is paved on the surface layer.
3) And (3) constructing an anticorrosive surface layer: and after the surface of the epoxy mortar is initially set, laying an anticorrosive layer on the surface of the mortar layer. The anticorrosive coating adopts three-cloth five-oil epoxy glass fiber reinforced plastic for corrosion prevention.
In the embodiment of the invention, the water-based epoxy resin is bisphenol A type epoxy resin with the trade name of E-54; the waterborne epoxy curing agent is a waterborne epoxy curing agent with the trademark of MF 20; the cement is P.O42.5 portland cement. The water reducing agent is polycarboxylate water reducing agent, the solid content is 40%, and the water reducing rate is 26%. The epoxy resin primer and the finish paint for the anticorrosion surface layer are epoxy resin E-44(6101) type, and the glass cloth is alkali-free flame-retardant glass fiber cloth.
Example 1:
a method for repairing hardened terrace with seepage prevention comprises the following steps:
1) base layer treatment: and (3) breaking the damaged original terrace structure, cleaning concrete fragments, floating dust, sludge and the like, compacting the base layer of the part to be filled, and carrying out surface treatment to be smooth. The breaking depth is not less than 420mm below the surface layer of the original plateau structure.
2) Construction of a lime soil cushion layer: and (3) paving the tamped pseudo-ginseng gray soil on the surface of the base layer, and ensuring that the compaction coefficient is more than or equal to 0.97 to obtain a gray soil cushion layer with a smooth surface. The total thickness of the pseudo-ginseng gray soil is 300mm, the pseudo-ginseng gray soil is tamped in 2 layers, and the thickness of each layer is 150 mm. The pseudo-ginseng grey soil is prepared by mixing slaked lime and clay in a volume ratio of 3:7, wherein the particle size of the clay is not more than 15mm, the particle size of the slaked lime is not more than 5mm, the water content is controlled to be 20%, and the pseudo-ginseng grey soil is uniformly mixed and has consistent color.
3) Preparation of C30 fine-grained concrete: firstly, taking 800 parts by weight of continuous graded broken stone, 700 parts by weight of river sand, 50 parts by weight of fly ash and 50% of Portland cement for dry mixing, then adding 50% of water, and then performing pre-mixing for 30min to obtain a pre-mixed material; and then adding 6 parts by weight of water reducing agent, the balance of cement and water into the premixed material, and stirring in a double-roller forced stirrer for 30min to prepare the mixture of the C30 fine aggregate concrete. The total amount of portland cement used in the above preparation process was 250 parts by weight, and the total amount of water was 140 parts by weight. The grain diameter of the continuous graded broken stone is 5-15 mm; the river sand is hard clean natural river sand, and the fineness modulus is 2.8; the water reducing agent is a polycarboxylate water reducing agent.
4) And (3) concrete layer construction: and (3) paving an impermeable film-polyethylene geomembrane with the thickness of 0.5mm on the surface of the lime soil cushion layer to serve as an impermeable layer, paving a mixture of C30 fine stone concrete on the surface of the impermeable layer, vibrating and compacting, and controlling the flatness to be not more than 3mm in height difference to form a concrete layer with the thickness of 100 mm.
5) Preparing epoxy mortar: uniformly mixing a waterborne epoxy curing agent, water and an accelerant to obtain a component A; uniformly mixing cement and river sand to obtain a component B; and (2) mixing the water-based epoxy resin with the component A, fully stirring by using a low-cost stirrer until the mixture becomes milky white and uniform without viscous feeling during stirring, adding the component B into the mixture, and uniformly stirring again to obtain the epoxy mortar. The weight ratio of the components is that the water-based epoxy resin, the water-based epoxy curing agent, the water, the cement, the river sand and the accelerator are 1:1.3:3:10:25: 0.1. The river sand adopts 20-140 meshes of gradation. The accelerator comprises a fatty amine accelerator DMP-30, benzhydrylamine and triethylene glycol monomethyl ether in a weight ratio of 1:0.2: 0.1.
6) And (3) construction of a mortar layer: and after bleeding on the surface of the concrete layer is removed and the initial setting state is achieved, laying the epoxy mortar with the thickness of 20mm on the surface of the concrete layer.
7) And (3) constructing an anticorrosive surface layer: after the surface of the epoxy mortar layer is initially set, an anticorrosive surface layer is laid on the surface of the mortar layer by adopting a construction scheme of epoxy glass fiber reinforced plastic three cloth five oil. Specifically, firstly painting an epoxy resin primer on the surface of the mortar layer, then painting a second epoxy resin primer, pasting a first glass cloth layer on the first epoxy resin primer, then painting a first epoxy resin finish paint, pasting a second glass cloth layer on the second epoxy resin primer, then painting a second epoxy resin finish paint, pasting a third glass cloth layer on the second epoxy resin primer, finally painting a third epoxy resin finish paint, and completing the acceptance check. Construction environment: the temperature is 15-30 ℃, and the relative humidity is less than 80%.
8) And (5) maintenance: after the whole terrace is hardened, the terrace can be put into use after natural curing for 7 days. During the curing period, water immersion, flying insects, dust and the like are prevented from entering within the first 6 hours, and people are prohibited from stepping, scraping hard objects and the like within 3-7 days.
Example 2:
the difference between the method for repairing the hardened terrace with seepage prevention provided in the embodiment and the embodiment 1 is only that:
in the step 1), the breaking depth is not less than 700mm below the surface layer of the original terrace structure.
In the step 2), the total paving thickness of the pseudo-ginseng gray soil is 450mm, the pseudo-ginseng gray soil is tamped in 3 layers, the thickness of each layer is 150mm, and the water content of the pseudo-ginseng gray soil is controlled to be 23%.
In the step 3), the consumption of the C30 fine-stone concrete is as follows: 350 parts of Portland cement, 1100 parts of continuous graded broken stone, 950 parts of river sand, 75 parts of fly ash, 8 parts of water reducing agent and 190 parts of water.
In the step 4), an impermeable film-polyethylene geomembrane with the thickness of 1.5mm is paved on the surface of the lime soil cushion layer to be used as an impermeable layer, and then a concrete layer with the thickness of 200mm is paved on the surface of the impermeable layer.
In the step 5), the weight ratio of each component of the epoxy mortar is as follows: the water-based epoxy resin, the water-based epoxy curing agent, the water, the cement, the river sand and the accelerator are 1:1.5:5:13:30: 0.3. The accelerator comprises fatty amine accelerator EP-184, benzhydrylamine and triethylene glycol monomethyl ether in a weight ratio of 1:0.5: 0.5.
And 6), paving 50mm thick epoxy mortar on the surface of the concrete layer.
Example 3:
the difference between the method for repairing the hardened terrace with seepage prevention provided in the embodiment and the embodiment 1 is only that:
in the step 1), the breaking depth is not less than 530mm below the surface layer of the original terrace structure.
In the step 2), the total paving thickness of the pseudo-ginseng gray soil is 300mm, the pseudo-ginseng gray soil is tamped in 2 layers, the thickness of each layer is 150mm, and the water content of the pseudo-ginseng gray soil is controlled to be 22%.
In the step 3), the consumption of the C30 fine-stone concrete is as follows: 330 parts of Portland cement, 1050 parts of continuous graded broken stone, 850 parts of river sand, 65 parts of fly ash, 8 parts of water reducing agent and 185 parts of water.
In the step 4), an impermeable film-polyethylene geomembrane with the thickness of 1.0mm is paved on the surface of the lime soil cushion layer to be used as an impermeable layer, and then a concrete layer with the thickness of 200mm is paved on the surface of the impermeable layer.
In the step 5), the weight ratio of the components of the epoxy mortar is 1:1.4:4.5:12.5:28: 0.2. The accelerator comprises a fatty amine accelerator DMP-30, benzhydrylamine and triethylene glycol monomethyl ether in a weight ratio of 1:0.35: 0.40.
And 6), paving epoxy mortar with the thickness of 30mm on the surface of the concrete layer.
After the embodiment is used for repairing and constructing the terrace of the factory area, the terrace is put into normal use again. The field repair was observed after 2 months with the following results: the whole terrace is intact, and the surface is level and smooth, and there is not sunken, perk, condition such as crack in former terrace and restoration structure junction.
Example 4:
the method for repairing the hardened and impermeable terrace provided in the embodiment repairs the worn terrace and the worn crack in advance under the condition that the original terrace structure only has the surface layer of wear and crack, and the specific repairing method is as follows:
1) surface layer treatment: the surface of the original lawn structure, which is only severely worn, is cleaned by a wire brush, blown clean by compressed gas and moistened by sprinkling water, and the surface is used as a surface layer. If small cracks exist on the surface of the original terrace structure, performing crack expanding treatment on the cracks by using a concrete cutting machine, and expanding the cracks to 20 mm; after the crack expansion is finished, blowing the inside of the crack by adopting compressed gas, and cleaning by using clear water; and then, pouring the epoxy mortar into the crack gap, and after the epoxy mortar is initially set, performing troweling treatment to keep the whole surface layer flat and integrated. The pressure of the compressed gas is 6MPa of nitrogen.
2) And (3) construction of a mortar layer: before construction, the chips, impurities and water on the surface layer are swept and cleaned by compressed gas, and then epoxy mortar with the thickness of 20-50mm is paved on the surface layer.
3) And (3) constructing an anticorrosive surface layer: and after the surface of the epoxy mortar layer is initially set, laying an anticorrosive surface layer on the surface of the mortar layer. The anti-corrosion surface layer is made of three-cloth five-oil epoxy glass fiber reinforced plastic for corrosion prevention.
In this example, the epoxy mortar and the epoxy mortar in example 1 have the same raw material composition and preparation steps, and the material and construction scheme of the anticorrosive surface layer are also the same as those in example 1.
Comparative example 1:
the difference between the method for repairing the hardened terrace with seepage prevention and the method provided by the comparative example and the example 3 is only that: in the step 5), the accelerator used by the epoxy mortar is a fatty amine accelerator DMP-30 and benzhydrylamine, and the weight ratio is 1: 0.35.
Comparative example 2:
the difference between the method for repairing the hardened terrace with seepage prevention and the method provided by the comparative example and the example 3 is only that: in the step 5), the accelerators used by the epoxy mortar are an aliphatic amine accelerator DMP-30 and triethylene glycol monomethyl ether in a weight ratio of 1: 0.40.
Comparative example 3:
the difference between the method for repairing the hardened terrace with seepage prevention and the method provided by the comparative example and the example 3 is only that: in the step 5), the accelerator used by the epoxy mortar is an aliphatic amine accelerator DMP-30.
Experimental example 1:
performance detection of terrace restoration structures manufactured by different restoration methods
The experimental method comprises the following steps: test pieces of the repaired structures were prepared in the same manner as in examples 1 to 4. The appearance and impact resistance of the terrace are measured according to the standard GB/T22374-2018. The water resistance (30d), gasoline resistance (120# gasoline, 72h), acid resistance (30% sulfuric acid solution, 72h), alkali resistance (60% sodium hydroxide solution, 72h) and salt water resistance (3% sodium chloride solution, 14d) of the terrace were measured by the drop method in standard GB/T9274-1988. The wear resistance of the floor is measured according to the standard GB/T1768-2006 (750g/500 r). The results are shown in Table 1.
Table 1 performance test results of different terrace repair structures
The result shows that after the floor is hardened, seepage-proofing and repaired by the repairing method disclosed by the invention, the obtained repaired structure floor has the advantages of low surface roughness, good wear resistance, good seepage-proofing and corrosion-proofing effects, high compressive and impact strength, excellent chemical resistance, suitability for repairing the floor with large foundation difference deformation and heavy load, and capability of effectively enhancing the durability and the service life of the floor.
Experimental example 2:
influence of different epoxy mortars on terrace repair structure
The experimental method comprises the following steps: the test pieces of the repaired structure are prepared by the methods of the embodiment 3 and the comparative examples 1 to 3, wherein the construction of the anti-corrosion surface layer is not carried out after the construction of the mortar layer is finished, and then the test pieces are cured to 28d after being hardened. (1) The chlorine ion penetration resistance test is carried out by an electric flux method in the national standard GB 50082-2009. (2) After the maintenance is finished, the test piece is taken out and the 28d age compressive strength F of the test piece is tested0. After the test is finished, the test piece is placed in a NaCl solution with the mass concentration of 3% to carry out an anti-corrosion test in a dry-wet cycle coupling environment. The method comprises the following specific steps: and (3) soaking the test block in 3% NaCl solution for 16h, drying at 80 +/-5 ℃ for 6h, taking out, naturally cooling for 2h, wherein 24h is a cycle, and 3 months is a test period. After the end of a test period, testing the compressive strength F of the test piece in a drying statet. Calculating the erosion resistance coefficient K of the test piece: k ═ Ft/F0. The results are shown in table 2 below.
Table 2 influence results of different epoxy mortars on terrace repair structure
| Example 3 | Comparative example 1 | Comparative example 2 | Comparative example 3 | |
| Chloride ion mobility m2/s | 2.34×10-12 | 6.89×10-11 | 2.61×10-11 | 7.43×10-11 |
| Coefficient of erosion resistance | 1.03 | 0.89 | 0.93 | 0.87 |
The results show that, as a result of the test of comparative example 3 and comparative examples 1 to 3, it was found that: the mortar layer formed by the epoxy mortar in the example 3 has the lowest chloride ion mobility and the lowest chloride ion permeability; under the dry-wet cycle coupling environment, the corrosion resistance coefficient of the sample 3 is the lowest, and the corrosion resistance of the sample to chloride ions is the strongest. Comprehensive description: the accelerant in the embodiment 3 can improve the bonding capacity of the interface transition region, close capillary pores in a concrete layer or a mortar layer, further reduce the permeability of mortar, further improve the chlorine ion pollution resistance, and enhance the corrosion resistance and the impermeability of the concrete layer, the mortar layer and a repair structure in a high saline-alkali environment.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; while the invention has been described in detail and with reference to the foregoing embodiments, those skilled in the art will appreciate that; the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A method for repairing a hardened terrace with seepage prevention is characterized by comprising the following steps: base layer treatment, lime soil cushion layer construction, concrete layer construction, mortar layer construction and anticorrosion surface layer construction;
an impermeable layer is also arranged between the lime soil cushion layer and the concrete layer;
c30 fine stone concrete is laid on the concrete layer, and the flatness is controlled to be not more than 3mm in height difference;
epoxy mortar is paved on the mortar layer, and the thickness is 20-50 mm;
the anti-corrosion surface layer adopts a construction scheme of epoxy glass fiber reinforced plastic three cloth five oil.
2. The method of claim 1, wherein: the base course treatment comprises the step of breaking the damaged original terrace structure, wherein the breaking depth is not less than 420-700mm below the surface layer of the original terrace structure.
3. The method of claim 1, wherein: the tamped pseudo-ginseng gray soil is paved on the gray soil cushion layer, the total paving thickness is 300-450mm, the pseudo-ginseng gray soil is tamped in 2-3 layers, the thickness of each layer is 150mm, and the compaction coefficient is more than or equal to 0.97.
4. The method of claim 1, wherein: and an impermeable film with the thickness of 0.5-1.5mm is laid on the impermeable layer, and the impermeable film is a geomembrane made of polyethylene material.
5. The method of claim 1, wherein: the concrete layer is laid to be 100-200mm thick; the raw materials of the C30 fine-grained concrete comprise the following components in parts by weight: 350 parts of 250-350 parts of portland cement, 1100 parts of continuous graded broken stone of 800-1100 parts of 700-950 parts of river sand, 50-75 parts of fly ash, 6-8 parts of a water reducing agent and 190 parts of water of 140-140 parts of sand.
6. The method of claim 5, wherein: the grain size of the continuous graded broken stone is 5-15 mm; the river sand is hard clean natural river sand, and the fineness modulus is 2.6-3.0; the water reducing agent is a polycarboxylate water reducing agent.
7. The method of claim 1, wherein: the epoxy mortar comprises the following components in percentage by weight: the water-based epoxy resin, the water-based epoxy curing agent, the water, the cement, the river sand and the accelerator are 1:1.3-1.5:3-5:10-13:25-30: 0.1-0.3.
8. The method of claim 7, wherein: the accelerator comprises a fatty amine accelerator, benzhydrylamine and triethylene glycol monomethyl ether in a weight ratio of 1:0.2-0.5: 0.1-0.5.
9. The method according to any one of claims 1-8, wherein: the mortar layer construction is carried out after the bleeding on the surface of the concrete layer is removed and the initial setting state is achieved; the construction of the anticorrosion surface layer is carried out after the surface of the epoxy mortar layer is initially set.
10. The floor hardening seepage-proofing repair structure prepared by the method of any one of claims 1 to 9, which is characterized by comprising a base layer, wherein a lime soil cushion layer, a concrete layer, a mortar layer and an anti-corrosion surface layer are sequentially arranged on the surface of the base layer from bottom to top; and an impermeable layer is arranged between the lime soil cushion layer and the concrete layer.
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