阅读说明：本技术 定量表征高聚物注浆材料与混凝土接触面形貌特征的方法 (Method for quantitatively characterizing morphological characteristics of contact surface of high polymer grouting material and concrete ) 是由 杜明瑞 方宏远 赵焱 张皓月 薛冰寒 杜雪明 李曼珺 于 2021-09-07 设计创作，主要内容包括：本发明涉及建筑施工技术领域,具体涉及一种定量表征高聚物注浆材料与混凝土接触面形貌特征的方法,具体包括：高聚物注浆材料－混凝土组合体试件三维CT工业扫描；高聚物注浆材料－混凝土组合体试件切割；接触面附近区域残留混凝土的酸化学腐蚀清理；接触面高精度三维激光扫描；接触面三维形貌重构及定量分析。本发明定量分析高聚物注浆材料与混凝土接触面的三维形貌特征,有助于研究注浆压力、高聚物材料密度等关键参数对二者接触面形成过程的影响,并且进一步揭示接触面胶结机理和利用能量耗散理论研究接触面力学特性的基础,对评价高聚物注浆加固效果有重要的理论意义。(The invention relates to the technical field of building construction, in particular to a method for quantitatively characterizing the morphological characteristics of a contact surface of a high polymer grouting material and concrete, which specifically comprises the following steps: three-dimensional CT industrial scanning of a high polymer grouting material-concrete composite test piece; cutting a high polymer grouting material-concrete composite test piece; acid chemical corrosion cleaning of residual concrete in the area near the contact surface; high-precision three-dimensional laser scanning of a contact surface; and (5) reconstructing the three-dimensional shape of the contact surface and carrying out quantitative analysis. The method quantitatively analyzes the three-dimensional morphological characteristics of the contact surface of the high polymer grouting material and the concrete, is beneficial to researching the influence of key parameters such as grouting pressure, high polymer material density and the like on the forming process of the contact surface of the high polymer grouting material and the concrete, further discloses the cementing mechanism of the contact surface and utilizes the energy dissipation theory to research the basis of the mechanical property of the contact surface, and has important theoretical significance for evaluating the grouting reinforcement effect of the high polymer.)

1. A method for quantitatively characterizing the morphological characteristics of the contact surface of a high polymer grouting material and concrete is characterized by comprising the following steps:

s1, obtaining a high polymer grouting material-concrete combination test piece, carrying out nondestructive slice scanning, and quantitatively analyzing the intrusion range of the high polymer grouting material to the concrete surface depression or pore;

s2, cutting off the concrete medium at the contact surface according to the invasion range, carrying out corrosion treatment on the residual concrete medium on the contact surface, and washing to completely expose the contact surface;

s3, scanning the exposed high polymer surface in a full range, and collecting the space three-dimensional coordinates of the contact surface to obtain contact surface point cloud data;

s4, meshing and reconstructing the contact surface, quantitatively calculating the area of the contact surface, and quantitatively characterizing the roughness characteristic of the contact surface by using a contour arithmetic mean deviation method.

2. The method for quantitatively characterizing the morphological characteristics of the contact surface of the polymer grouting material and the concrete as claimed in claim 1, wherein in the method, a three-dimensional industrial CT system is used for non-destructive slice scanning of the polymer grouting material-concrete composite test piece, and the morphological characteristics of the contact surface of the polymer grouting material and the concrete are preliminarily judged based on the scanning result.

3. The method for quantitatively characterizing the morphological features of the contact surface of the polymer grouting material and the concrete according to claim 2, wherein in the method, ImageJ software is used for extracting the pore shape information of the material near the contact surface and quantitatively analyzing the invasion range of the polymer grouting material to the concrete surface depression or pore.

4. The method for quantitatively characterizing the contact surface topography of the polymer grouting material and the concrete according to claim 1, wherein, in the method, most of the concrete medium near the contact surface is cut off by mechanical cutting, and simultaneously the polymer grouting material intruding into the pores of the concrete surface is kept unchanged.

5. The method for quantitatively characterizing the morphological characteristics of the contact surface of the polymer grouting material and the concrete according to claim 1, wherein in the method, under the room temperature condition, the residual concrete medium on the contact surface is corroded by using a dilute hydrochloric acid solution with the mass fraction of N%, and then is washed by clean water to completely expose the contact surface, wherein N is less than 8 and less than 10.

6. The method for quantitatively characterizing the morphological characteristics of the contact surface of the polymer grouting material and the concrete according to claim 1, wherein the method is characterized in that a high-precision three-dimensional laser scanner is used for scanning the exposed surface of the polymer in a full range to obtain the point cloud data of the contact surface.

7. The method for quantitatively characterizing the morphological characteristics of the contact surface of the polymer grouting material and the concrete as claimed in claim 1, wherein the method comprises the steps of meshing and reconstructing the contact surface by using a reverse engineering software Geomagic Studio, and quantitatively calculating the area of the contact surface.

8. The method according to claim 1, wherein when the roughness characteristic of the contact surface is quantitatively characterized by using a contour arithmetic mean deviation method, the plane-1 and the plane-2 are two planes which are parallel to an x-y plane in space and respectively pass through a lowest point and a highest point in a curved plane, the ordinate of a point on the curved plane, which is intersected with the plane-1, is 0, and the ordinate of the other points on the curved plane is z_i(x,y)；

Determining the plane (plane-m) at the middle position of the curved surface according to the space positions of the plane-1 and plane-2 planes, and making the longitudinal coordinate of the plane-m as z₀Then, the distance formula from each point on the curved surface to the plane-m plane is:

d_i＝|z_i(x,y)-z₀|

the plane roughness formula is then:

Technical Field

The invention relates to the technical field of building construction, in particular to a method for quantitatively representing the appearance characteristics of a contact surface of a high polymer grouting material and concrete.

Background

The high polymer grouting technology is characterized in that a double-component raw material of isocyanate and polyol is directly injected into cracks of a rock-soil body under the action of pressure, and the raw material is solidified and expanded after a chemical reaction, so that the aims of lifting an upper structure, filling cavity cracks and preventing seepage and stopping leakage are fulfilled. The high polymer grouting technology is successfully applied to the trenchless rapid repair of traffic, water conservancy, municipal and other infrastructure engineering facilities.

In actual engineering, the high polymer grouting material is usually tightly attached to existing engineering bodies such as roadbeds, pipelines and dams, and the engineering problem of the contact surface of the high polymer material and concrete occurs.

The method has the advantages that the three-dimensional morphology characteristics of the contact surface of the high polymer grouting material and the concrete are quantitatively analyzed, the influence of key parameters such as grouting pressure and the density of the high polymer material on the forming process of the contact surface of the high polymer grouting material and the concrete is facilitated to be researched, the method is a basis for further disclosing the cementing mechanism of the contact surface and researching the mechanical property of the contact surface by utilizing an energy dissipation theory, and has important theoretical significance for evaluating the grouting reinforcement effect of the high polymer.

Disclosure of Invention

Aiming at the defects of the prior art, the invention discloses a method for quantitatively characterizing the morphological characteristics of the contact surface of a high polymer grouting material and concrete, which is used for solving the engineering problem caused by the fact that the contact surface of the high polymer grouting material and the concrete cannot be accurately analyzed.

The invention is realized by the following technical scheme:

the invention provides a method for quantitatively characterizing the morphological characteristics of the contact surface of a high polymer grouting material and concrete, which comprises the following steps:

s1, obtaining a high polymer grouting material-concrete combination test piece, carrying out nondestructive slice scanning, and quantitatively analyzing the intrusion range of the high polymer grouting material to the concrete surface depression or pore;

s2, cutting off the concrete medium at the contact surface according to the invasion range, carrying out corrosion treatment on the residual concrete medium on the contact surface, and washing to completely expose the contact surface;

s3, scanning the exposed high polymer surface in a full range, and collecting the space three-dimensional coordinates of the contact surface to obtain contact surface point cloud data;

s4, meshing and reconstructing the contact surface, quantitatively calculating the area of the contact surface, and quantitatively characterizing the roughness characteristic of the contact surface by using a contour arithmetic mean deviation method.

Furthermore, in the method, a three-dimensional industrial CT system is used for carrying out nondestructive slice scanning on the high polymer grouting material-concrete composite test piece, and the morphological characteristics of the contact surface of the high polymer grouting material and the concrete are preliminarily judged based on the scanning result.

Furthermore, in the method, ImageJ software is used for extracting the pore shape information of the material near the contact surface, and the invasion range of the high polymer grouting material to the concrete surface depression or the pore is quantitatively analyzed.

Furthermore, in the method, most of the concrete medium near the contact surface is cut off by a mechanical cutting mode, and meanwhile, the high polymer grouting material intruding into the pores of the concrete surface is kept unchanged.

Furthermore, in the method, under the condition of room temperature, a dilute hydrochloric acid solution with the mass fraction of N% is used for carrying out corrosion treatment on the residual concrete medium on the contact surface, and then the contact surface is washed by clear water to be completely exposed, wherein 8 < N < 10 >.

Furthermore, the high polymer grouting material has strong acid corrosion resistance, and dilute hydrochloric acid solution cannot damage the high polymer grouting material in the corrosion process, so that the original shape and other information of a contact surface are reserved on the surface of the high polymer exposed after the concrete is corroded and stripped.

Furthermore, in the method, a high-precision three-dimensional laser scanner is used for scanning the exposed surface of the high polymer in a full range to obtain contact surface point cloud data.

Furthermore, in the method, the contact surface is subjected to meshing and reconstruction by using a reverse engineering software Geomagic Studio, and the area of the contact surface is quantitatively obtained.

Furthermore, in the method, when the roughness characteristic of the contact surface is quantitatively characterized by using a contour arithmetic mean deviation method, a plane-1 and a plane-2 are taken as two planes which are parallel to an x-y plane in space and respectively pass through the lowest point and the highest point in a curved surface, the vertical coordinate of a point on the curved surface, which is intersected with the plane-1, is taken as 0, and the vertical coordinates of the other points on the curved surface are recorded as z_i(x,y)；

Determining the plane (plane-m) at the middle position of the curved surface according to the space positions of the plane-1 and plane-2 planes, and making the longitudinal coordinate of the plane-m as z₀Then, the distance formula from each point on the curved surface to the plane-m plane is:

d_i＝|z_i(x,y)-z₀|

the plane roughness formula is then:

the invention has the beneficial effects that:

the method quantitatively analyzes the three-dimensional morphological characteristics of the contact surface of the high polymer grouting material and the concrete, is beneficial to researching the influence of key parameters such as grouting pressure, high polymer material density and the like on the forming process of the contact surface of the high polymer grouting material and the concrete, further discloses the cementing mechanism of the contact surface and utilizes the energy dissipation theory to research the basis of the mechanical property of the contact surface, and has important theoretical significance for evaluating the grouting reinforcement effect of the high polymer.

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, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a diagram of the steps of a method for quantitatively characterizing the topography of the contact surface of a polymer grouting material and concrete;

FIG. 2 is a schematic diagram illustrating the calculation of the roughness of the contact surface according to the embodiment of the present invention;

FIG. 3 is a schematic diagram of the three-dimensional morphology actual measurement structure of the test piece and the contact surface of the polymer grouting material-concrete composite in the embodiment of the invention;

FIG. 4 is a graph showing the three-dimensional topography of the contact surface of the test piece of the polymer grouting material-concrete composite according to the embodiment of the invention.

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 drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. 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.

Example 1

The embodiment discloses a method for quantitatively characterizing the contact surface morphology of a high polymer grouting material and concrete, which is shown in fig. 1, and comprises the following steps:

s1, obtaining a high polymer grouting material-concrete combination test piece, carrying out nondestructive slice scanning, and quantitatively analyzing the intrusion range of the high polymer grouting material to the concrete surface depression or pore;

s2, cutting off the concrete medium at the contact surface according to the invasion range, carrying out corrosion treatment on the residual concrete medium on the contact surface, and washing to completely expose the contact surface;

s3, scanning the exposed high polymer surface in a full range, and collecting the space three-dimensional coordinates of the contact surface to obtain contact surface point cloud data;

s4, meshing and reconstructing the contact surface, quantitatively calculating the area of the contact surface, and quantitatively characterizing the roughness characteristic of the contact surface by using a contour arithmetic mean deviation method.

The three-dimensional morphological characteristics of the contact surface of the high polymer grouting material and the concrete are quantitatively analyzed, and the influence of key parameters such as grouting pressure and the density of the high polymer material on the forming process of the contact surface of the high polymer grouting material and the concrete is favorably researched.

Example 2

In a specific implementation aspect, the embodiment provides a test method for quantitatively characterizing three-dimensional morphology characteristics of a contact surface of a high polymer grouting material and concrete with high precision, which specifically comprises the following steps:

and obtaining the polymer grouting material-concrete composite test piece in a mode of drilling and coring on site or prefabricating and pouring in a laboratory.

In the embodiment, a three-dimensional industrial CT system is utilized to perform nondestructive slice scanning on the high polymer grouting material-concrete composite test piece, and the morphological characteristics of the contact surface of the high polymer grouting material and the concrete are preliminarily judged based on the scanning result.

In this embodiment, ImageJ software is used to extract information such as the pore shape of the material near the contact surface, and the intrusion range of the high polymer grouting material into the concrete surface depressions or pores is quantitatively analyzed.

According to the invasion range of the high polymer grouting material, most of the concrete medium near the contact surface is cut off by a mechanical cutting mode, and the high polymer grouting material invading into the pores on the concrete surface is not affected.

In this embodiment, a dilute hydrochloric acid solution with a mass fraction of 10% is used to corrode the concrete medium remaining on the contact surface at room temperature, and then the contact surface is washed with clean water to be completely exposed.

The high polymer grouting material has stronger acid corrosion resistance, and dilute hydrochloric acid solution can not damage the high polymer grouting material in the corrosion process, so that the information of the original shape and the like of a contact surface is reserved on the surface of the high polymer exposed after the concrete is corroded and stripped.

In the embodiment, the high-precision three-dimensional laser scanner is used for scanning the exposed surface of the high polymer in a full range, the space three-dimensional coordinates of the contact surface are collected, and the cloud data of the contact surface points are obtained.

According to the embodiment, the contact surface is subjected to grid division and reconstruction by using the Geomagic Studio software according to the contact surface point cloud data, and the area of the contact surface is quantitatively obtained.

In this embodiment, a roughness characteristic of a contact surface is quantitatively characterized by using a contour arithmetic mean deviation method according to point cloud data of the contact surface, as shown in fig. 2, the following is specifically described:

let plane-1 and plane-2 be two planes parallel to x-y plane in space and passing through lowest point and highest point in curved surface respectively, take the longitudinal coordinate of the point on the curved surface intersecting with plane-1 as 0, then the longitudinal coordinate of the rest points on the curved surface is recorded as z_i(x,y)；

Determining the plane (plane-m) at the middle position of the curved surface according to the space positions of the plane-1 and plane-2 planes, and making the longitudinal coordinate of the plane-m as z₀Then, the distance formula from each point on the curved surface to the plane-m plane is:

d_i＝|z_i(x,y)-z₀|

the plane roughness formula is then:

example 3

On the aspect of a specific embodiment, the embodiment discloses a specific implementation of a method for quantitatively characterizing the morphology characteristics of a contact surface of a polymer grouting material and concrete, and as shown in fig. 3, the structure is a schematic diagram of a three-dimensional morphology actual measurement structure of a polymer grouting material-concrete combination test piece and the contact surface; FIG. 4 shows the three-dimensional morphology results of the contact surface of the polymer grouting material and the concrete obtained by the method.

The high polymer grouting material-concrete composite test piece in the embodiment is a cube with the side length of 100mm and is obtained through prefabrication in a laboratory. Pouring a C30 concrete foundation (the height is 50mm), curing for 28 days under standard conditions, pressing a high polymer grouting material into a closed mold, curing for 2 hours under natural conditions, and removing the mold for later use.

After the concrete base is poured, part of cement paste is randomly dripped on the upper surface of the concrete base and then is maintained, so that irregular bulges are prefabricated, and the identification degree of the three-dimensional shape in the subsequent analysis process is improved.

After the characterization of the contact surface morphology, it can be found that the contact surface area is 10025.786mm2, the roughness is 0.00152mm, and the identification degree of the concave position on the contact surface is high.

In conclusion, the method disclosed by the invention has the advantages that the three-dimensional morphological characteristics of the contact surface of the high polymer grouting material and the concrete are quantitatively analyzed, the influence of key parameters such as grouting pressure and the density of the high polymer material on the forming process of the contact surface of the high polymer grouting material and the concrete is favorably researched, the cementing mechanism of the contact surface is further disclosed, the basis of researching the mechanical property of the contact surface by utilizing the energy dissipation theory is further disclosed, and the method has important theoretical significance for evaluating the grouting reinforcement effect of the high polymer.

The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; 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.