CN116597926A - Design system and method for high-ductility cement-based repair material for dichotomy crack development - Google Patents
Design system and method for high-ductility cement-based repair material for dichotomy crack development Download PDFInfo
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- 239000000463 material Substances 0.000 title claims abstract description 285
- 239000004568 cement Substances 0.000 title claims abstract description 234
- 230000008439 repair process Effects 0.000 title claims abstract description 121
- 238000000034 method Methods 0.000 title claims abstract description 22
- 239000004567 concrete Substances 0.000 claims abstract description 111
- 239000011159 matrix material Substances 0.000 claims abstract description 107
- 239000002356 single layer Substances 0.000 claims abstract description 3
- 239000010410 layer Substances 0.000 claims description 27
- 230000003993 interaction Effects 0.000 claims description 18
- 230000000977 initiatory effect Effects 0.000 claims description 9
- 239000000203 mixture Substances 0.000 claims description 4
- 229910001208 Crucible steel Inorganic materials 0.000 claims description 3
- 238000005266 casting Methods 0.000 claims description 3
- 238000001514 detection method Methods 0.000 claims description 3
- 238000005336 cracking Methods 0.000 abstract description 14
- 230000009471 action Effects 0.000 abstract description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 14
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 12
- 239000004576 sand Substances 0.000 description 11
- 230000007547 defect Effects 0.000 description 8
- 229910000831 Steel Inorganic materials 0.000 description 5
- 239000003638 chemical reducing agent Substances 0.000 description 5
- 239000000835 fiber Substances 0.000 description 5
- 239000010959 steel Substances 0.000 description 5
- 238000002360 preparation method Methods 0.000 description 4
- 229910021487 silica fume Inorganic materials 0.000 description 3
- 238000009826 distribution Methods 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000011398 Portland cement Substances 0.000 description 1
- 239000006004 Quartz sand Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 210000000988 bone and bone Anatomy 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 239000008367 deionised water Substances 0.000 description 1
- 229910021641 deionized water Inorganic materials 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000010438 granite Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000021715 photosynthesis, light harvesting Effects 0.000 description 1
- 229920005646 polycarboxylate Polymers 0.000 description 1
- 239000003469 silicate cement Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 239000008399 tap water Substances 0.000 description 1
- 235000020679 tap water Nutrition 0.000 description 1
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Abstract
The invention discloses a system and a method for designing a high-ductility cement-based repair material for developing a dichotomy crack, and belongs to the field of concrete. The invention limits the elastic modulus ratio of the high-ductility cement-based repair material to the concrete matrix to be 1.25-1.45; the high-ductility cement-based repair material is poured on the surface of the concrete matrix, the thickness ratio of the single-layer high-ductility cement-based repair material to the concrete matrix is 0.1-0.15, and the thickness-span ratio of the whole test piece is 0.07-0.1. The high-ductility cement-based repairing material disclosed by the invention shows dichotomous crack development under the drive action of two external forces, and the crack development of the cement-based material appears at the middle position of the whole section of cement-based material and shows dichotomous cracking, so that the randomness of cracking of the traditional cement-based material is changed, and the crack development of the cement-based material is controllable.
Description
Technical Field
The invention belongs to the field of concrete, and particularly relates to a system and a method for designing a high-ductility cement-based repair material for developing a dichotomy crack.
Background
The disclosure of this background section is only intended to increase the understanding of the general background of the invention and is not necessarily to be construed as an admission or any form of suggestion that this information forms the prior art already known to those of ordinary skill in the art.
The cement-based material has strong loading capacity, good durability and high cost performance, and is a main structural engineering material at present, but the traditional cement-based material has low tensile strength and large brittleness, which is unfavorable for the earthquake-resistant performance of the civil engineering structure, and the cement-based material is easy to deteriorate and lose efficacy during service so as to be out of service. Crack development is the primary mode of structural vibration and energy dissipation, and the crack development is shown to be the ductility of the cement-based material.
The cement-based composite material performance is designed to improve the ductility of the cracked matrix, control the crack propagation direction or change the failure mode, so that the tensile capacity and the deformability of the concrete are improved. The cracking position of the cement-based material usually occurs at the defect position in the cement-based material, the cracking position is full of randomness and uncertainty, and the cracking is essentially that the tensile stress at the section of the cement-based material is larger than the tensile strength of the cement-based material, so that the cracking occurs; for a uniformly stressed cement-based material, the cement-based material tensile stress depends on the cross-sectional stressed area, i.e. on how many defects are at the cross-section, whereas the defects of the cement-based material are random, in other words the cracking of the cement-based material is also random.
The random development of cracks enables the design of the ductility of the cement-based material based on the probability of random distribution of defects, the randomness of the cracks enables the designability of the ductility of the cement-based material to be reduced, and if the cracks of the cement-based material are developed in order, the ductility and the energy consumption of the cement-based material can be designed and controlled. Therefore, providing a method for designing a cement-based material with orderly developed cracks is a technical problem to be solved in the field.
Disclosure of Invention
In order to solve the defects in the prior art, the invention aims to provide a design method of a high-ductility cement-based repair material for developing a bisection crack, which changes the randomness of the cracking of the traditional cement-based material and ensures that the crack development of the cement-based material has controllability.
In order to achieve the above purpose, the technical scheme of the invention is as follows:
in a first aspect of the invention, there is provided a method of designing a high-ductility cement-based repair material for dichotomous crack initiation, comprising:
preparing a cement-based repairing material, detecting the elastic modulus and tensile strength of the cement-based repairing material, and detecting the elastic modulus and thickness of a concrete matrix to be repaired;
carrying out uniform roughness treatment on the surface of the concrete matrix, and pouring a cement-based repairing material on the surface of the concrete matrix after the treatment;
calculating tensile stress of the cement-based repair material based on the interface interaction coefficient of the concrete matrix and the cement-based repair material, the unequal deformation of the cement-based repair material and the concrete matrix, the elastic modulus of the cement-based repair material, the thickness of the cement-based repair material layer, the elastic modulus of the concrete matrix, the thickness of the concrete matrix layer and the overall span length after pouring;
the tensile stress of the cement-based repairing material is larger than that of the cement-based repairing material, and the cement-based repairing material is a high-ductility cement-based repairing material for developing a bisection crack; the tensile stress is smaller than the tensile strength of the cement-based repairing material, and the parameters of the elastic modulus of the cement-based repairing material, the thickness ratio of the cement-based repairing material to the concrete matrix and the overall thickness-to-span ratio after pouring are adjusted so that the tensile stress of the cement-based repairing material is larger than the tensile strength of the cement-based repairing material.
The random development of cracks makes the cement-based material ductility designed based on the angle of probability of random distribution of defects, and the randomness of cracks makes the cement-based material ductility designability reduced. If cracks of the cement-based material develop orderly, the ductility and energy consumption of the cement-based material can be designed and controlled. The development essence of the crack is that the tensile stress at the section is larger than the tensile strength of the material, the traditional method is that the section force of the material is equal, the interface stress is different due to different defects, and the crack development is uncontrollable due to the randomness of the defects. If the stresses experienced by the sections in the cement-based material of equal cross-sectional area are not equal, the stresses are not due to the inequality of the actual stressed areas of the sections, so that the crack development of the cement-based material can be controlled and designed. Therefore, the invention provides a design method of a high-ductility cement-based material for developing a dichotomous crack.
The high-ductility cement-based repairing material provided by the invention has the advantages that the repairing material develops a dichotomous crack under the driving action of two external forces, the shrinkage of the repairing material is performed, the repairing material and the concrete matrix are enabled to generate non-equivalent deformation, the curing time of the concrete matrix is long, the shrinkage is basically stable, when the repairing material is shrunk, the repairing material is subjected to the interface action, the tensile stress is generated by the repairing material, the maximum position of the tensile stress is generated in the middle of a pouring section, and along with the increase of the shrinkage driving force, the tensile stress received by the repairing material is larger than the tensile strength of the repairing material, and the repairing material is cracked at the midspan position.
After the first crack occurs, the cement-based material of the repair layer is divided into two parts as the shrinkage of the repair material increases. The respective integral repairing materials interact with the matrix interface, the tensile force born by the repairing materials is gradually increased, the corresponding maximum position appears in the middle position of the respective integral repairing materials until the tensile stress born by the repairing materials is larger than the tensile strength of the repairing materials, and the cracking appears in the midspan position of the respective integral repairing materials. And sequentially carrying out, wherein the crack is developed from the middle to two sides, and the appearance positions are the middle positions of the cross sections of the repairing materials which are respectively integral.
The other driving force is that the matrix is subjected to tensile stress, at the moment, the repairing material applies force in the opposite direction of external load to the matrix through the interface, the repairing material is subjected to tensile stress, the maximum position of the tensile stress is shown in the midspan position of the interface of the repairing material, until the tensile stress of the repairing material generated by the external load driving force is larger than the tensile strength, and the repairing material is cracked in the midspan position.
After the first crack appears, the cement-based material of the repair layer is divided into two parts, and the cement-based material is further divided into two parts along with the gradual increase of the tensile stress applied to the concrete matrix. The respective integral repairing materials interact with the matrix interface, the tensile force born by the repairing materials is gradually increased, the corresponding maximum position appears in the middle position of the respective integral repairing materials until the tensile stress born by the repairing materials is larger than the tensile strength of the repairing materials, and the cracking appears in the midspan position of the respective integral repairing materials. And sequentially carrying out, wherein the crack is developed from the middle to two sides, and the appearance positions are the middle positions of the cross sections of the repairing materials which are respectively integral.
The repair material and the concrete matrix deform uncoordinated.
In some embodiments of the invention, the casting is casting along the upper and lower symmetry planes of the concrete matrix.
In some embodiments of the invention, the concrete matrix has a set time of more than two years, and shrinkage tends to stabilize, enabling non-equivalent deformation with high-ductility cement-based restorative materials.
In some embodiments of the invention, the modulus of elasticity of the cement-based repair material is adjusted such that the ratio of the modulus of elasticity of the cement-based repair material to the modulus of elasticity of the concrete matrix is between 1.25 and 1.45; the thickness ratio of the single-layer cement-based repair material to the concrete matrix is adjusted to be 0.1-0.15, and the thickness-span ratio of the whole body after pouring is adjusted to be 0.07-0.1.
In some embodiments of the invention, the modulus of elasticity of the cement-based repair material is adjusted by adjusting the composition of the cement-based repair material.
In some embodiments of the present invention, the calculation formula of the interfacial interaction coefficient between the concrete matrix and the cement-based repair material is shown in formula 1; the calculation formula of the tensile stress of the cement-based repair material is shown in formula 2;
wherein: f (f) t -the cement-based repair material is subjected to tensile stress;
delta-unequal deformation of cement-based restorative material and concrete matrix;
E X -the modulus of elasticity of the cement-based repair material;
H X -cement-based repair material layer thickness;
E J -the modulus of elasticity of the concrete matrix;
H J -concrete base layer thickness;
l-overall span length after pouring;
a- -the interfacial interaction coefficient between the concrete matrix and the repair material.
The invention is not limited to the composition and the preparation method of the concrete matrix, and can be matched with the high-ductility cement-based repair material for use. For example, the aggregate matrix proportions are in mass percent: 360-450 parts of cement, 200-245 parts of water, 560-620 parts of sand and 1000-1200 parts of coarse aggregate. The preparation method of the concrete matrix comprises the following steps: mixing cement, water, sand and coarse aggregate in proportion.
The cement is ordinary Portland cement, the water is tap water or deionized water, the sand is machine-made sand or river sand, and the coarse bone stone is granite or basalt.
In some embodiments of the present invention, the composition and preparation method of the high-ductility cement-based restoration material are not limited, and the high-ductility cement-based restoration material can be applied as a restoration material. For example, the high-ductility cement-based repair material is proportioned by mass fraction: 860-950 parts of cement, 260-300 parts of silica fume, 920-1100 parts of sand, 140-165 parts of steel fiber, 220-250 parts of water and 19-23 parts of water reducer. The preparation method of the high-ductility cement-based repair material comprises the following steps: mixing cement, silica fume, sand, steel fiber, water and water reducing agent in certain proportion.
Wherein the cement is ordinary silicate cement. The sand is quartz sand or river sand. The steel fiber is a straight steel fiber, the diameter is 0.1-0.3 mm, and the length is 10-15 mm. The water reducer is a polycarboxylate water reducer, the solid content is 30%, and the water reducing rate is more than 40%.
In a second aspect of the present invention, there is provided a system for designing a high-ductility cement-based repair material for dichotomous crack initiation, comprising:
the detection module is used for configuring the cement-based repair material, detecting the elastic modulus and tensile strength of the cement-based repair material and detecting the elastic modulus and thickness of the concrete matrix to be repaired;
the pouring module is used for carrying out uniform roughness treatment on the surface of the concrete matrix, and pouring the cement-based repair material onto the surface of the concrete matrix after the treatment;
the calculation module is used for calculating tensile stress of the cement-based restoration material based on the interface interaction coefficient of the concrete matrix and the cement-based restoration material, the unequal deformation of the cement-based restoration material and the concrete matrix, the elastic modulus of the cement-based restoration material, the thickness of the cement-based restoration material layer, the elastic modulus of the concrete matrix, the thickness of the concrete matrix layer and the overall span length after pouring;
the adjusting module is used for comparing the tensile stress of the cement-based repairing material with the tensile strength of the cement-based repairing material; the tensile stress is larger than the tensile strength of the cement-based repair material, and the crack bisection method of the cement-based repair material is developed; if the tensile stress is smaller than the tensile strength of the cement-based repairing material, the parameters of the elastic modulus of the cement-based repairing material, the thickness ratio of the cement-based repairing material to the concrete matrix and the overall thickness-to-span ratio after pouring are adjusted, so that the tensile stress of the cement-based repairing material is larger than the tensile strength of the cement-based repairing material.
In some embodiments of the invention, the adjustment module adjusts the elastic modulus of the cement-based repair material such that the elastic modulus ratio of the cement-based repair material to the concrete matrix is 1.25-1.45; the thickness ratio of the cement-based repair material to the concrete matrix is adjusted to be 0.1-0.15; and adjusting the thickness-span ratio of the whole cast steel to be 0.07-0.1.
In some embodiments of the present invention, the calculation formula of the interfacial interaction coefficient between the concrete matrix and the cement-based repair material is shown in formula 1; the calculation formula of the tensile stress of the cement-based repair material is shown as the formula 2
Wherein: f (f) t -the cement-based repair material is subjected to tensile stress;
delta-unequal deformation of cement-based restorative material and concrete matrix;
E X -the modulus of elasticity of the cement-based repair material;
H X -cement-based repair material layer thickness;
E J -the modulus of elasticity of the concrete matrix;
H J -concrete base layer thickness;
l-overall span length after pouring;
a- -the interfacial interaction coefficient between the concrete matrix and the repair material.
The beneficial effects of the invention are as follows:
(1) According to the design method of the high-ductility cement-based repair material for developing the bisection method cracks, the crack development of the cement-based material is performed at the middle position of the whole section of cement-based material, and the cracking is performed in a bisection mode, so that the randomness of the cracking of the traditional cement-based material is changed, and the crack development of the cement-based material is controllable.
(2) The gradient stress to which the cement-based material is subjected is mainly realized by virtue of the unequal deformation of the two cement-based materials and the interaction of the two cement-based materials through an interface. The invention makes the stress of cement-based materials with the same cross-section area present a stress gradient form, and provides possibility for designing stress cracking positions of cement-based materials.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention.
FIG. 1 is a schematic diagram of the stress effect of non-equivalent deformation of the high-ductility cement-based repair material and the concrete matrix material of the present invention;
FIG. 2 is a graph showing the tensile stress gradient of the high-ductility cement-based repair material of the present invention;
FIG. 3 is a graph showing crack initiation positions and sequences of the high-ductility cement-based repair material according to the present invention, wherein 1 represents the 1 st crack and occurrence position, 2 represents the 2 nd crack and occurrence position, and 3 represents the 3 rd crack and occurrence position.
Detailed Description
In order to enable those skilled in the art to more clearly understand the technical scheme of the present invention, the technical scheme of the present invention will be described in detail with reference to specific embodiments.
Example 1
The embodiment discloses a design method of a high-ductility cement-based repair material for developing a dichotomous crack, which comprises the following steps:
the concrete matrix comprises 449 parts of cement, 220 parts of water, 606 parts of river sand and 1125 parts of coarse aggregate according to mass fraction. The components are mixed to prepare the concrete matrix with the dimensions of 2000mm long, 25mm wide and 180mm high. The concrete matrix was left for 3 years and the shrinkage area was stable. The elastic modulus of the concrete matrix was found to be 37GPa.
The high-ductility cement-based repair material is prepared from 920 parts of cement, 276 parts of silica fume, 1012 parts of sand, 156 parts of steel fiber, 239 parts of water and 21 parts of water reducer according to mass fraction. The components are mixed to prepare the high-ductility cement-based repair material. The elastic modulus of the high-ductility cement-based repair material is 50GPa and the tensile strength is 6MPa.
The high-ductility cement-based repairing material is poured on the surface of the concrete matrix, the concrete matrix is symmetrically poured along the surface of the concrete matrix, the poured dimension is 2000mm multiplied by 25mm, the poured thickness is 20mm, and before repairing the concrete matrix, the two surfaces with the dimension of 2000mm multiplied by 25mm are roughened, so that the roughness of the surface of the concrete matrix is improved, and the mechanical biting force between new and old concrete is enhanced.
The tensile stress to which the high-ductility cement-based restoration material is subjected is calculated according to formulas 1 and 2.
Wherein: f (f) t -the cement-based repair material is subjected to tensile stress;
delta-unequal deformation of cement-based restorative material and concrete matrix;
E X -the modulus of elasticity of the cement-based repair material;
H X -cement-based repair material layer thickness;
E J -the modulus of elasticity of the concrete matrix;
H J -concrete base layer thickness;
l-overall span length after pouring;
a- -the interfacial interaction coefficient between the concrete matrix and the repair material.
Shrinkage of the high-ductility cement-based repair material itself causes non-equivalent deformation of the repair material and the concrete matrix, as shown in fig. 1. The concrete matrix is basically stable in solidification time and shrinkage, when the repairing material is shrunk, the repairing material generates tensile stress under the action of an interface, the maximum tensile stress position appears in the middle of the pouring section, and along with the increase of the shrinkage driving force, the tensile stress born by the repairing material is larger than the tensile strength of the repairing material, and the repairing material is cracked at the midspan position. As shown in fig. 2, the tensile stress of the high-ductility cement-based restoration material is graded.
The tensile stress to which the repair material is subjected was calculated to be 7MPa and the shrinkage was calculated to be 600 mu epsilon according to the above-described formulas 1 and 2. The tensile strength of the repairing material is 6MPa. At this time, the tensile stress of the repair material is larger than the tensile strength of the repair material, and the middle position of the cross section of the repair material is cracked. After the first crack occurs, the cement-based material of the repair layer is bisected, and is bisected again as the shrinkage of the repair material increases. The respective integral repairing materials interact with the matrix interface, the tensile force born by the repairing materials is gradually increased, the corresponding maximum position appears in the middle position of the respective integral repairing materials until the tensile stress born by the repairing materials is larger than the tensile strength of the repairing materials, and the cracking appears in the midspan position of the respective integral repairing materials. And sequentially carrying out, wherein the crack is developed from the middle to two sides, and the appearance positions are the middle positions of the cross sections of the repairing materials which are respectively integral. The sequence and position of the cracks are shown in fig. 3, and it can be seen that the high-ductility cement-based repair material shows dichotomous crack development under the driving action of two external forces.
Example 2
It is an object of this embodiment to provide a high-ductility cement-based repair material design system for dichotomous crack propagation, comprising:
the detection module is used for configuring the cement-based repair material, detecting the elastic modulus and the tensile strength of the cement-based repair material and detecting the elastic modulus and the thickness of the concrete matrix to be repaired.
And the pouring module is used for carrying out uniform roughness treatment on the surface of the concrete matrix, and pouring the cement-based repair material onto the surface of the concrete matrix after the treatment.
The calculation module is used for calculating tensile stress of the cement-based restoration material based on the interface interaction coefficient of the concrete matrix and the cement-based restoration material, the unequal deformation of the cement-based restoration material and the concrete matrix, the elastic modulus of the cement-based restoration material, the thickness of the cement-based restoration material layer, the elastic modulus of the concrete matrix, the thickness of the concrete matrix layer and the overall span length after pouring.
The calculation formula of the interface interaction coefficient of the concrete matrix and the cement-based repair material is shown as formula 1; the calculation formula of the tensile stress of the cement-based repair material is shown in formula 2;
wherein: f (f) t -the cement-based repair material is subjected to tensile stress;
delta-unequal deformation of cement-based restorative material and concrete matrix;
E X -the modulus of elasticity of the cement-based repair material;
H X -cement-based repair material layer thickness;
E J -the modulus of elasticity of the concrete matrix;
H J -concrete base layer thickness;
l-overall span length after pouring;
a- -the interfacial interaction coefficient between the concrete matrix and the repair material.
The adjusting module is used for comparing the tensile stress of the cement-based repairing material with the tensile strength of the cement-based repairing material; the tensile stress is larger than the tensile strength of the cement-based repair material, and the crack bisection method of the cement-based repair material is developed; if the tensile stress is smaller than the tensile strength of the cement-based repairing material, the parameters of the elastic modulus of the cement-based repairing material, the thickness ratio of the cement-based repairing material to the concrete matrix and the overall thickness-to-span ratio after pouring are adjusted, so that the tensile stress of the cement-based repairing material is larger than the tensile strength of the cement-based repairing material. The adjusting module is used for adjusting the elastic modulus of the cement-based repairing material to enable the elastic modulus ratio of the cement-based repairing material to the concrete matrix to be 1.25-1.45; the thickness ratio of the cement-based repair material to the concrete matrix is adjusted to be 0.1-0.15; and adjusting the thickness-span ratio of the whole cast steel to be 0.07-0.1.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A method of designing a high-ductility cement-based repair material for dichotomous crack propagation, comprising:
preparing a cement-based repairing material, detecting the elastic modulus and tensile strength of the cement-based repairing material, and detecting the elastic modulus and thickness of a concrete matrix to be repaired;
carrying out uniform roughness treatment on the surface of the concrete matrix, and pouring a cement-based repairing material on the surface of the concrete matrix after the treatment;
calculating tensile stress of the cement-based repair material based on the interface interaction coefficient of the concrete matrix and the cement-based repair material, the unequal deformation of the cement-based repair material and the concrete matrix, the elastic modulus of the cement-based repair material, the thickness of the cement-based repair material layer, the elastic modulus of the concrete matrix, the thickness of the concrete matrix layer and the overall span length after pouring;
the tensile stress of the cement-based repairing material is larger than that of the cement-based repairing material, and the cement-based repairing material is a high-ductility cement-based repairing material for developing a bisection crack; the tensile stress is smaller than the tensile strength of the cement-based repairing material, and the parameters of the elastic modulus of the cement-based repairing material, the thickness ratio of the cement-based repairing material to the concrete matrix and the overall thickness-to-span ratio after pouring are adjusted so that the tensile stress of the cement-based repairing material is larger than the tensile strength of the cement-based repairing material.
2. The method of designing a high-ductility cement-based repair material for bisection crack growth according to claim 1, wherein the casting is performed along upper and lower symmetry planes of the concrete matrix.
3. The method of designing a high-ductility cement-based repair material for dichotomous crack growth of claim 1, wherein the concrete matrix has a curing time exceeding two years and shrinkage is stabilized.
4. The method for designing a cement-based repair material with high ductility for crack initiation by a dichotomy according to claim 1, wherein the elastic modulus of the cement-based repair material is adjusted so that the elastic modulus ratio of the cement-based repair material to the concrete matrix is 1.25 to 1.45; the thickness ratio of the single-layer cement-based repair material to the concrete matrix is adjusted to be 0.1-0.15, and the thickness-span ratio of the whole body after pouring is adjusted to be 0.07-0.1.
5. The method for designing a cement-based restoration material with high ductility for crack initiation by a dichotomy according to claim 4, wherein the elastic modulus of the cement-based restoration material is adjusted by adjusting the composition of the cement-based restoration material.
6. The design method of the high-ductility cement-based repair material for dichotomy crack initiation according to claim 1, wherein a calculation formula of the interfacial interaction coefficient between the concrete matrix and the cement-based repair material is shown in formula 1;
wherein:
E X -the modulus of elasticity of the cement-based repair material;
H X -cement-based repair material layer thickness;
E J -the modulus of elasticity of the concrete matrix;
H J -concrete base layer thickness;
a- -the interfacial interaction coefficient between the concrete matrix and the repair material.
7. The method for designing a high-ductility cement-based repair material for dichotomy crack initiation according to claim 1, wherein a calculation formula of tensile stress of the cement-based repair material is shown in formula 2;
wherein: f (f) t -the cement-based repair material is subjected to tensile stress;
delta-unequal deformation of cement-based restorative material and concrete matrix;
E X -the modulus of elasticity of the cement-based repair material;
H X -cement-based repair material layer thickness;
E J -the modulus of elasticity of the concrete matrix;
H J -concrete base layer thickness;
l-overall span length after pouring;
a- -the interfacial interaction coefficient between the concrete matrix and the repair material.
8. A system for designing a high-ductility cement-based repair material for dichotomous crack propagation, comprising:
the detection module is used for configuring the cement-based repair material, detecting the elastic modulus and tensile strength of the cement-based repair material and detecting the elastic modulus and thickness of the concrete matrix to be repaired;
the pouring module is used for carrying out uniform roughness treatment on the surface of the concrete matrix, and pouring the cement-based repair material onto the surface of the concrete matrix after the treatment;
the calculation module is used for calculating tensile stress of the cement-based restoration material based on the interface interaction coefficient of the concrete matrix and the cement-based restoration material, the unequal deformation of the cement-based restoration material and the concrete matrix, the elastic modulus of the cement-based restoration material, the thickness of the cement-based restoration material layer, the elastic modulus of the concrete matrix, the thickness of the concrete matrix layer and the overall span length after pouring;
the adjusting module is used for comparing the tensile stress of the cement-based repairing material with the tensile strength of the cement-based repairing material; the tensile stress is larger than the tensile strength of the cement-based repair material, and the crack bisection method of the cement-based repair material is developed; if the tensile stress is smaller than the tensile strength of the cement-based repairing material, the parameters of the elastic modulus of the cement-based repairing material, the thickness ratio of the cement-based repairing material to the concrete matrix and the overall thickness-to-span ratio after pouring are adjusted, so that the tensile stress of the cement-based repairing material is larger than the tensile strength of the cement-based repairing material.
9. The system for designing a high-ductility cement-based repair material for dichotomy crack initiation of claim 8, wherein the adjusting module adjusts the elastic modulus of the cement-based repair material so that the elastic modulus ratio of the cement-based repair material to the concrete matrix is 1.25-1.45; the thickness ratio of the cement-based repair material to the concrete matrix is adjusted to be 0.1-0.15; and adjusting the thickness-span ratio of the whole cast steel to be 0.07-0.1.
10. The system for designing a high-ductility cement-based repair material for dichotomy crack initiation of claim 8, wherein the calculation formula of the interfacial interaction coefficient of the concrete matrix and the cement-based repair material by the calculation module is shown in formula 1; the calculation formula of the tensile stress of the cement-based repair material is shown in formula 2;
wherein: f (f) t -the cement-based repair material is subjected to tensile stress;
delta-unequal deformation of cement-based restorative material and concrete matrix;
E X -the modulus of elasticity of the cement-based repair material;
H X -cement-based repair material layer thickness;
E J -the modulus of elasticity of the concrete matrix;
H J -concrete base layer thickness;
l-overall span length after pouring;
a- -the interfacial interaction coefficient between the concrete matrix and the repair material.
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