CN107036938B - Measuring device and measuring method for evaluating hydrophobicity of concrete surface - Google Patents
Measuring device and measuring method for evaluating hydrophobicity of concrete surface Download PDFInfo
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Abstract
The invention discloses a measuring device for evaluating the hydrophobicity of a concrete surface, wherein a base is axially provided with a driving and reversing spiral guide rail, the driving and reversing spiral guide rail is provided with a lifting bracket, and the upper end of the lifting bracket is provided with an objective table; the front end of the base is provided with a front support, the end part of the front support is fixedly provided with a vertical adjustment support, a first horizontal guide rail is arranged on the vertical adjustment support, a vertical imager and a spiral liquid feeder are arranged on the first horizontal guide rail, the rear end of the base is vertically provided with a rear support, a second horizontal guide rail is arranged on the rear support, and a horizontal imager is arranged on the second horizontal guide rail; the advantages are that: simple structure, convenient operation and low cost. The hydrophobicity of the tested piece is evaluated by titrating deionized water on the surface of the tested piece, taking a photo after the liquid beads reach static balance, and obtaining the absolute contact area and the residual absolute volume of the liquid beads after a liquid bead model is built by Auto CAD software; the operation is simple, and the influence of human factors can be reduced.
Description
Technical Field
The invention relates to the technical field of material hydrophobicity evaluation, in particular to a measuring device and a measuring method for evaluating the hydrophobicity of a concrete surface, and particularly relates to hydrophobicity evaluation for a concrete surface corrosion prevention technology contrast test.
Background
To improve the durability of concrete structures, various design and construction measures can be generally taken at the material level, the member level and/or the structural level, wherein the corrosion protection of concrete surfaces belongs to a class of economical and effective corrosion protection techniques at the material level.
The concrete structure surface corrosion prevention technology mainly relies on an isolation layer on the concrete surface as a physical shield, so that mediums such as moisture, oxygen, chloride ions, acid gas and the like are difficult to permeate into a concrete protection layer to block an ion migration channel of electrochemical reaction, thereby prolonging the service life of the concrete structure. Practice shows that the concrete surface anticorrosion technology has longer application history, wider range and better effect.
However, the concrete structure surface corrosion prevention technology has a plurality of types, and can be divided into permeation type sealants, thin film protective coatings, thick film barrier coatings and the like only by physical action, wherein some of the technologies mainly block liquid permeation and diffusion, and some of the technologies also block gas permeation at the same time; some are pore hydrophobic lining mechanisms, some are pore filling and blocking mechanisms, and some are surface blocking mechanisms only. Therefore, what kind of surface corrosion protection scheme is adopted is often a entanglement problem in the durability design process of concrete engineering, and especially for some important infrastructure engineering in special environments.
The conventional method is to simulate the actual engineering environment under the same condition to carry out complex comparison experiments, and compare the technical index, construction operation, single manufacturing cost and full life cost of the scheme to be selected. However, different technical schemes, whether the conventional anticorrosive paint, polyurea elastomer paint, cement-based permeable crystallization paint or fluorosilicone-based permeable protective agent correspond to different technical standards, so that the experimental obtained technical index parameters are often not comparable.
Because a plurality of corrosion factors enter the concrete through the concrete surface by taking water as a medium, the hydrophobicity of the concrete surface after different corrosion resistance treatments is an important index for evaluating the corrosion resistance of the surface. The hydrophobicity of a concrete surface is one of the important properties of concrete durability and is determined by the chemical composition and the microscopic geometry of the surface. When the drop is dropped onto a horizontal surface of concrete, the drop forms an angle with the concrete surface to reach equilibrium, which is commonly referred to as the contact angle, which is denoted by "θ". The size of theta can measure the infiltration degree of the solid surface, the greater the theta is, the better the hydrophobicity of the concrete is, the better the self-cleaning or easy-cleaning effect is, and the stronger the capability of inhibiting the invasion of corrosion factors is.
However, for concrete engineering, in the prior art, the contact angle is used as an index for evaluating the surface hydrophobicity of a concrete structure, so that the special test instrument is high in cost, complex in operation and insufficient in field portability, the contact angle before and after the rotation of the same liquid drop by 180 degrees is measured, and particularly, the contact angle has a plurality of limitations on a sample and an experimental environment, and consistency of experimental conditions and pertinence of experimental conditions cannot be achieved for different surface corrosion prevention technologies.
Disclosure of Invention
Aiming at the current state of the art, the invention provides the measuring device for evaluating the hydrophobicity of the concrete surface and the measuring method thereof, which have the advantages of simple structure, convenient operation, strong practicability and low cost.
The technical scheme adopted for solving the technical problems is as follows:
the measuring device for evaluating the hydrophobicity of the concrete surface comprises a base, wherein a driving and reversing spiral guide rail is axially arranged on the base, a lifting support is arranged on the driving and reversing spiral guide rail, and an objective table is arranged at the upper end of the lifting support; the front end of base is provided with the fore-stock, and the tip of fore-stock is fixed with vertical adjustment support, is provided with first horizontal guide rail on this vertical adjustment support, is provided with vertical imager and at least one spiral feed liquor ware on the first horizontal guide rail, and the rear end of base is vertical to be provided with the rear bracket, is provided with the second horizontal guide rail on the rear bracket, is provided with horizontal imager on this second horizontal guide rail.
The optimized technical measures also comprise:
the base is provided with a horizontal bubble instrument.
Leveling supporting feet are respectively arranged at four corners of the bottom surface of the base.
The middle part of the front bracket is provided with an LED lamp strip.
The front bracket is of an inverted L-shaped structure.
The number of the spiral liquid feeders is two, and the two spiral liquid feeders are respectively arranged on two sides of the vertical imaging instrument.
The vertical imager and the screw liquid feeder are both provided with a knob for adjusting the horizontal position.
The measuring method of the measuring device for evaluating the hydrophobicity of the concrete surface comprises the following steps:
step one, fixing a tested piece on an objective table, and adjusting a lifting bracket to enable the upper surface of the objective table to be level with the horizontal central line of a horizontal imager;
step two, titrating deionized water on the surface of the tested piece by using a spiral liquid feeder, and waiting for the liquid beads to reach static balance;
thirdly, placing a horizontal scale beside the liquid beads, adjusting the vertical position and the horizontal position of the vertical imaging instrument by utilizing a vertical adjusting bracket and a first horizontal guide rail, shooting clear overlook photos of the liquid beads by using the vertical imaging instrument after adjusting the vertical position and the horizontal position in place, and guiding the photos into a computer;
step four, a vertical scale is placed beside the liquid beads, the horizontal position of the horizontal imaging instrument is adjusted by utilizing a second horizontal guide rail, after the horizontal imaging instrument is adjusted in place, a clear side view photo of the liquid beads is shot by the horizontal imaging instrument, and the side view photo is led into a computer;
and fifthly, establishing a liquid bead model by using Auto CAD software, reading the area and the volume of the bottom surface of the liquid bead, and obtaining the absolute contact area and the residual absolute volume of the liquid bead to evaluate the hydrophobicity of the tested piece.
The absolute contact area is obtained by the following specific steps:
opening Auto CAD software, entering an Auto CAD operation interface, clicking the tool bar for 'insert' by the left button of a mouse, clicking the grating image reference by the left button of the mouse, entering the operation interface for 'select reference file', finding out a needed overlook photo, clicking the left button of the mouse for insertion, and adjusting the size of the photo until the scale factor is 1;
clicking a left button of the mouse to perform drawing in a toolbar, clicking a multi-section line again to enter a multi-section line drawing function, continuously moving the mouse along the contact boundary between the liquid bead and the surface of the test piece, and clicking the left button of the mouse once every moving a section of distance until a closed polygon is formed;
the left mouse button clicks the drawing in the toolbar, then clicks the area, pops up the selection object frame, moves the mouse, makes the selection object frame select the multi-section line, clicks the left mouse button, clicks the right mouse button or clicks the Enter, and creates the area successfully;
the left mouse button clicks a tool in the toolbar, the left mouse button clicks a query, the area/quality characteristic is clicked, the selection object box is popped up, the mouse is moved to enable the selection object box to select a multi-section line and click the left mouse button, the right mouse button is clicked or the Enter is clicked, and the required area is obtained from the popped Auto CAD text box.
The specific steps of obtaining the residual absolute volume are as follows:
opening Auto CAD software, entering an Auto CAD operation interface, clicking the tool bar for 'insert' by the left button of a mouse, clicking the grating image reference by the left button of the mouse, entering the operation interface for 'select reference file', finding out a needed side view photo, clicking the left button of the mouse for insertion, and adjusting the size of the photo until the scale factor is 1;
drawing in the left mouse button clicking toolbar, clicking the straight line again, ejecting the straight line drawing frame, drawing a line segment along the contact interface between the liquid ball and the surface of the test piece, and marking as l 1 Finding out the midpoint of the line segment using the object capturing function, and drawing a line perpendicular to l again using the "straight line" tool 1 Is denoted as l 2 The method comprises the steps of carrying out a first treatment on the surface of the The left mouse button clicks the drawing in the toolbar again, and the multi-section line drawing interface is popped up by clicking the multi-section line function with the left mouse button, so that the drawing interface is drawn by the line section l 1 One mouse left button is clicked once to draw a multi-section line by moving the mouse along the surface of the liquid bead for a short distance by taking one end point as a starting point until the multi-section line is connected with the line section l 2 Intersecting, and recording the multi-section line as l 3 The method comprises the steps of carrying out a first treatment on the surface of the The three lines can form a closed polygon, and the redundant length line segments are removed;
clicking the 'modification' in the toolbar by the left mouse button, clicking the 'merging' by the left mouse button, popping up a selection frame of the 'object to be merged', sequentially selecting three line segments by the frame, clicking the left mouse button, and displaying the line changed into a dotted line to indicate that the selection is successful; after the three line segments are successfully selected, clicking the right button of the mouse or clicking the Enter to combine the three line segments into a closed polygon;
the left mouse button clicks the drawing in the toolbar, then clicks the area, pops up the selection object frame, moves the mouse, makes the selection object frame select the multi-section line, clicks the left mouse button, clicks the right mouse button or clicks the Enter, and creates the area successfully;
clicking the left button of the mouse to click the drawing in the toolbar, clicking the modeling, clicking the rotating, popping up the selection frame of the object to be rotated, selecting the polygon by the selection frame, clicking the left button of the mouse, clicking the Enter or clicking the right button of the mouse, selecting the confirm in the popped up dialog, and clicking the left button of the mouse; then the interface for selecting the rotation axis is popped up, and the left button of the mouse clicks the line segment l in turn 2 After the two endpoints of the R-F-R interface are popped up, the default rotation angle of software is 360 degrees, and the Enter is directly clicked;
clicking the formed wire frame graph by the left button of the mouse, clicking the view in the toolbar by the left button of the mouse, clicking the visual style again by the left button, and clicking the true again by the left button, so as to obtain a simulation graph of the liquid phase residual volume;
the left mouse button clicks a tool in the toolbar, the left mouse button clicks a query, then clicks a surface area/quality characteristic, pops up a selection object box, moves the mouse to enable the selection object box to select a graph, clicks the left mouse button, clicks the right mouse button or clicks an Enter, and obtains a required volume from the popped Auto CAD text box.
The measuring device for evaluating the hydrophobicity of the concrete surface adjusts the horizontal position of the objective table through the advancing and retreating spiral guide rail and adjusts the vertical position of the objective table through the lifting support, so that the position of the objective table is adjusted, and the measuring device is simple in structure and convenient to adjust; the measuring device completes dropping liquid through the spiral liquid feeder, obtains overlook photos and side view photos through the vertical imaging instrument and the horizontal imaging instrument correspondingly, and prepares for subsequent absolute contact area and residual absolute volume measurement.
According to the measuring method of the measuring device for evaluating the hydrophobicity of the concrete surface, deionized water is titrated on the surface of a tested piece, after the liquid beads reach static balance, a top view photo and a side view photo are taken, the top view photo and the side view photo are imported into a computer, and after a liquid bead model is built by Auto CAD software, the absolute contact area and the residual absolute volume of the liquid beads are obtained to evaluate the hydrophobicity of the tested piece. The method is simple to operate, low in cost, capable of reducing the influence of human factors, and suitable for evaluation of comparative experiments of various concrete surface corrosion prevention technologies.
Whether the experiment of salt water resistance, salt fog resistance, acid and alkali resistance, water absorption capacity and acid rain resistance or the evaluation of ultraviolet aging resistance is carried out; both short-term accelerated laboratory simulation environments and long-term field exposure experimental environments can be subjected to experimental and comparative evaluation by using the method of the invention.
Drawings
Fig. 1 is a schematic structural view of the present invention.
Detailed Description
The invention is described in further detail below with reference to the embodiments of the drawings.
As shown in the schematic structural diagram of figure 1,
icon number description: base 1, front bracket 11, LED lamp area 11a, back support 12, horizontal bubble appearance 13, leveling supporting legs 14, advance and retreat spiral guide rail 2, lifting support 3, first horizontal guide rail 4, vertical adjustment support 41, vertical imaging appearance 5, spiral feed liquor ware 6, second horizontal guide rail 7, horizontal imaging appearance 8, knob 9.
The present invention is described in further detail below with reference to examples.
The measuring device for evaluating the hydrophobicity of the concrete surface comprises a base 1, wherein a driving and reversing spiral guide rail 2 is axially arranged on the base 1, a lifting support 3 is arranged on the driving and reversing spiral guide rail 2, and an objective table 31 is arranged at the upper end of the lifting support 3; the front end of the base 1 is provided with a front support 11, the end of the front support 11 is fixedly provided with a vertical adjustment support 41, a first horizontal guide rail 4 is arranged on the vertical adjustment support 41, a vertical imager 5 and a screw liquid feeder 6 are arranged on the first horizontal guide rail 4, the rear end of the base 1 is vertically provided with a rear support 12, a second horizontal guide rail 7 is arranged on the rear support 12, and a horizontal imager 8 is arranged on the second horizontal guide rail 7.
In the embodiment, a horizontal bubble meter 13 is arranged on the base 1.
In the embodiment, leveling support feet 14 are respectively arranged at four corners of the bottom surface of the base 1.
In order to ensure the accuracy of measurement, the device needs to be leveled before use, and the leveling bubble instrument 13 and the leveling supporting legs 14 are arranged, so that the leveling operation is greatly facilitated, and the measurement efficiency can be effectively improved.
In the embodiment, the middle part of the front bracket 11 is provided with an LED light strip 11a. The LED lamp strip 11a is arranged, so that the effect of the pictures shot by the vertical imager 5 and the horizontal imager 8 is better and clearer.
In the embodiment, the front bracket 11 has an inverted L-shaped structure.
In the embodiment, the number of the spiral liquid feeders 6 is two, and the two spiral liquid feeders 6 are respectively arranged at two sides of the vertical imager 5. The two spiral liquid feeders 6 are arranged to drop liquid from two tested pieces, so that the experimental efficiency can be improved, the consistency of objective conditions can be ensured during a comparison experiment, and the experimental accuracy is improved.
In the embodiment, a knob 9 for adjusting the horizontal position is provided on each of the vertical imager 5 and the screw feeder 6.
The measuring method of the measuring device for evaluating the hydrophobicity of the concrete surface comprises the following steps:
step one, fixing a tested piece on an objective table 31, and adjusting a lifting bracket 3 to enable the upper surface of the objective table 31 to be level with the horizontal central line of a horizontal imager 8;
step two, dripping quantitative (2 ml) deionized water on the surface of the tested piece by using a spiral liquid feeder 6, and waiting for the liquid beads to reach static balance;
thirdly, placing a horizontal scale beside the liquid beads, adjusting the vertical position and the horizontal position of the vertical imaging instrument 5 by utilizing the vertical adjusting bracket 41 and the first horizontal guide rail 4, taking a clear overlook picture of the liquid beads by the vertical imaging instrument 5 after the vertical imaging instrument 5 is adjusted in place, and guiding the picture into a computer; the horizontal scale adopts a film scale;
step four, a vertical scale is placed beside the liquid beads, the horizontal position of the horizontal imaging instrument 8 is adjusted by the aid of the second horizontal guide rail 7, after the horizontal imaging instrument 8 is adjusted in place, a clear side view picture of the liquid beads is shot by the aid of the horizontal imaging instrument 8, and the side view picture is led into a computer; the vertical scale adopts an inside micrometer;
and fifthly, establishing a liquid bead model by using Auto CAD software, reading the area and the volume of the bottom surface of the liquid bead, and obtaining the absolute contact area and the residual absolute volume of the liquid bead to evaluate the hydrophobicity of the tested piece.
Absolute contact area of liquid phase: the area of the bead in contact with the surface of the test piece is referred to as the liquid phase contact area.
Absolute residual volume: and (3) dropwise adding quantitative liquid beads (2 ml) on the surface of the test piece, wherein after the liquid beads are contacted with the surface of the test piece, a part of water permeates into the test piece, so that the volume of the liquid beads on the surface of the test piece is changed, and the volume of the liquid beads is called the residual absolute volume after the liquid beads reach the static balance.
After the deionized water was added dropwise, the edge of the bead in contact with the test block was carefully observed with a magnifying glass, and the static equilibrium was judged when the contact edge did not significantly expand outward for a period of time (about 5 s).
To ensure the accuracy of the measurement, the software unit needs to be determined to be millimeter (mm) first, and the operation steps are as follows:
entering an Auto CAD operation interface, clicking a tool in a toolbar by a left key, clicking an option by the left key, clicking user system configuration by the left key, obtaining a source content unit and a target image unit from an insertion proportion in an opened interface, wherein the source content unit and the target image unit are both millimeter, and determining to exit an option operation interface by the left key.
From the viewpoint of size, the water droplet in the photograph has been scaled as compared with the actual water droplet, and in Auto CAD, in order to obtain the actual contact area or residual absolute volume of the water droplet with the test piece, the picture must be scaled again to be the same size as the actual water droplet. The specific operation steps are as follows:
1) Entering an Auto CAD operation interface, clicking ' insert ' in a toolbar by a left mouse button, clicking ' raster image reference ' by the left mouse button, entering a ' select reference file ' operation interface, finding a required picture, clicking a left mouse button, clicking ' open ' by the left mouse button, entering an ' attach image ' operation interface, determining that ' insert point ' and ' designate ' in a scaling scale ' are selected on a screen (hook selection exists in a previous box) on the interface, and leaving the other modes unchanged. And clicking the left button of the mouse to Enter the picture insertion interface, clicking the 'Enter' (the default picture insertion point of the software is the origin of coordinates (0, 0)), clicking the 'Enter' (the default picture scaling factor of the software is 1), clicking the roller, and displaying the picture on the center of the operation interface.
2) The scale mark of the scale (namely the inside micrometer and the film ruler) can be clearly seen from the picture, the distance between the two scale marks is measured to be a, and in reality, the distance between the two adjacent scale marks in the scale is 1 millimeter, so that the scaling multiple of the picture can be obtained. The specific operation steps are as follows: and clicking a tool on the left mouse button in the toolbar, clicking the query on the left mouse button, clicking the distance on the left mouse button, and sequentially clicking two adjacent scale marks on the scale, so that the distance between the two scale marks is obtained. The ratio of the actual distance (1 mm) between the two scale marks to the obtained distance is the scale factor of the picture needing to be rescaled.
3) The left mouse click on the "modify" in the toolbar, then click on the "zoom", pop up the "select object box", move the mouse, "put the select object box" on the picture, click the left mouse click on the picture, click the right mouse click or Enter, click the left mouse click on any point in the picture select the base point, then directly input the zoom factor by using the keyboard, click Enter or click the right mouse click on the right mouse click and click the "confirm" left mouse click. The scaling is completed.
4) Rechecking. This step is to check whether the size of the beads in the rescaled picture is the same as in practice. The operation is the same as in step 2) until the scale factor is 1.
The absolute contact area is obtained by the following specific steps:
opening Auto CAD software, entering an Auto CAD operation interface, clicking the tool bar for 'insert' by the left button of a mouse, clicking the grating image reference by the left button of the mouse, entering the operation interface for 'select reference file', finding out a needed overlook photo, clicking the left button of the mouse for insertion, and adjusting the size of the photo until the scale factor is 1;
clicking a left button of the mouse to perform drawing in a toolbar, clicking a multi-section line again to enter a multi-section line drawing function, continuously moving the mouse along the contact boundary between the liquid bead and the surface of the test piece, and clicking the left button of the mouse once every moving a section of distance until a closed polygon is formed;
the left mouse button clicks the drawing in the toolbar, then clicks the area, pops up the selection object frame, moves the mouse, makes the selection object frame select the multi-section line, clicks the left mouse button, clicks the right mouse button or clicks the Enter, and creates the area successfully;
the left mouse button clicks a tool in the toolbar, the left mouse button clicks a query, the area/quality characteristic is clicked, the selection object box is popped up, the mouse is moved to enable the selection object box to select a multi-section line and click the left mouse button, the right mouse button is clicked or the Enter is clicked, and the required area is obtained from the popped Auto CAD text box. The area shown in the Auto CAD text box is in square millimeters and is converted to square centimeters for use.
The specific steps of obtaining the residual absolute volume are as follows:
opening Auto CAD software, entering an Auto CAD operation interface, clicking the tool bar for 'insert' by the left button of a mouse, clicking the grating image reference by the left button of the mouse, entering the operation interface for 'select reference file', finding out a needed side view photo, clicking the left button of the mouse for insertion, and adjusting the size of the photo until the scale factor is 1;
drawing in the left mouse button clicking toolbar, clicking the straight line again, ejecting the straight line drawing frame, drawing a line segment along the contact interface between the liquid ball and the surface of the test piece, and marking as l 1 UsingThe object capturing function finds the midpoint of the line segment, and again uses the "straight line" tool to draw a line perpendicular to l 1 Is denoted as l 2 The method comprises the steps of carrying out a first treatment on the surface of the The left mouse button clicks the drawing in the toolbar again, and the multi-section line drawing interface is popped up by clicking the multi-section line function with the left mouse button, so that the drawing interface is drawn by the line section l 1 One mouse left button is clicked once to draw a multi-section line by moving the mouse along the surface of the liquid bead for a short distance by taking one end point as a starting point until the multi-section line is connected with the line section l 2 Intersecting, and recording the multi-section line as l 3 The method comprises the steps of carrying out a first treatment on the surface of the The three lines can form a closed polygon, and the redundant length line segments are removed;
clicking the 'modification' in the toolbar by the left mouse button, clicking the 'merging' by the left mouse button, popping up a selection frame of the 'object to be merged', sequentially selecting three line segments by the frame, clicking the left mouse button, and displaying the line changed into a dotted line to indicate that the selection is successful; after the three line segments are successfully selected, clicking the right button of the mouse or clicking the Enter to combine the three line segments into a closed polygon;
the left mouse button clicks the drawing in the toolbar, then clicks the area, pops up the selection object frame, moves the mouse, makes the selection object frame select the multi-section line, clicks the left mouse button, clicks the right mouse button or clicks the Enter, and creates the area successfully;
clicking the left button of the mouse to click the drawing in the toolbar, clicking the modeling, clicking the rotating, popping up the selection frame of the object to be rotated, selecting the polygon by the selection frame, clicking the left button of the mouse, clicking the Enter or clicking the right button of the mouse, selecting the confirm in the popped up dialog, and clicking the left button of the mouse; then the interface for selecting the rotation axis is popped up, and the left button of the mouse clicks the line segment l in turn 2 After the two endpoints of the R-F-R interface are popped up, the default rotation angle of software is 360 degrees, and the Enter is directly clicked;
clicking the formed wire frame graph by the left button of the mouse, clicking the view in the toolbar by the left button of the mouse, clicking the visual style again by the left button, and clicking the true again by the left button, so as to obtain a simulation graph of the liquid phase residual volume;
the left mouse button clicks a tool in the toolbar, the left mouse button clicks a query, then clicks a surface area/quality characteristic, pops up a selection object box, moves the mouse to enable the selection object box to select a graph, clicks the left mouse button, clicks the right mouse button or clicks an Enter, and obtains a required volume from the popped Auto CAD text box. The Auto CAD text box displays a volume in cubic millimeters, which is converted to cubic centimeters for use.
The preferred embodiments of this invention have been described so far that various changes or modifications may be made by one of ordinary skill in the art without departing from the scope of this invention.
Claims (7)
1. The measuring method of the measuring device for evaluating the hydrophobicity of the concrete surface comprises a base (1) and is characterized in that: the base (1) is axially provided with a driving and reversing spiral guide rail (2), the driving and reversing spiral guide rail (2) is provided with a lifting support (3), and the upper end of the lifting support (3) is provided with an objective table (31); the front end of the base (1) is provided with a front support (11), the end part of the front support (11) is fixedly provided with a vertical adjustment support (41), a first horizontal guide rail (4) is arranged on the vertical adjustment support (41), a vertical imager (5) and at least one spiral liquid feeder (6) are arranged on the first horizontal guide rail (4), the rear end of the base (1) is vertically provided with a rear support (12), the rear support (12) is provided with a second horizontal guide rail (7), and a horizontal imager (8) is arranged on the second horizontal guide rail (7); the measuring method of the measuring device for evaluating the hydrophobicity of the concrete surface comprises the following steps:
step one, fixing a tested piece on an objective table (31), and adjusting a lifting bracket (3) to enable the upper surface of the objective table (31) to be level with the horizontal central line of a horizontal imager (8);
step two, titrating deionized water on the surface of the tested piece by using a spiral liquid feeder (6) until the liquid beads reach static balance;
thirdly, placing a horizontal scale beside the liquid beads, adjusting the vertical position and the horizontal position of the vertical imaging instrument (5) by utilizing the vertical adjusting bracket (41) and the first horizontal guide rail (4), shooting clear overlook photos of the liquid beads by the vertical imaging instrument (5) after adjusting the vertical position and the horizontal position to be in place, and guiding the photos into a computer;
step four, a vertical scale is placed beside the liquid beads, the horizontal position of a horizontal imaging instrument (8) is adjusted by a second horizontal guide rail (7), after the horizontal imaging instrument (8) is adjusted in place, a clear side view picture of the liquid beads is shot by the horizontal imaging instrument (8), and the side view picture is led into a computer;
fifthly, establishing a liquid bead model by using Auto CAD software, reading the area and the volume of the bottom surface of the liquid bead, and obtaining the absolute contact area and the residual absolute volume of the liquid bead to evaluate the hydrophobicity of the tested piece;
the specific steps of obtaining the absolute contact area are as follows:
opening Auto CAD software, entering an Auto CAD operation interface, clicking the tool bar for 'insert' by the left button of a mouse, clicking the grating image reference by the left button of the mouse, entering the operation interface for 'select reference file', finding out a needed overlook photo, clicking the left button of the mouse for insertion, and adjusting the size of the photo until the scale factor is 1;
clicking a left button of the mouse to perform drawing in a toolbar, clicking a multi-section line again to enter a multi-section line drawing function, continuously moving the mouse along the contact boundary between the liquid bead and the surface of the test piece, and clicking the left button of the mouse once every moving a section of distance until a closed polygon is formed;
the left mouse button clicks the drawing in the toolbar, then clicks the area, pops up the selection object frame, moves the mouse, makes the selection object frame select the multi-section line, clicks the left mouse button, clicks the right mouse button or clicks the Enter, and creates the area successfully;
clicking a tool in a toolbar by a left mouse button, clicking a query by the left mouse button, clicking a surface area/quality characteristic, popping up a selection object frame, moving the mouse to enable the selection object frame to select a multi-section line, clicking the left mouse button, clicking a right mouse button or clicking an Enter, and obtaining a required area from the popped Auto CAD text frame;
the specific steps of obtaining the residual absolute volume are as follows:
opening Auto CAD software, entering an Auto CAD operation interface, clicking the tool bar for 'insert' by the left button of a mouse, clicking the grating image reference by the left button of the mouse, entering the operation interface for 'select reference file', finding out a needed side view photo, clicking the left button of the mouse for insertion, and adjusting the size of the photo until the scale factor is 1;
drawing in the left mouse button clicking toolbar, clicking the straight line again, ejecting the straight line drawing frame, drawing a line segment along the contact interface between the liquid ball and the surface of the test piece, and marking as l 1 Finding out the midpoint of the line segment using the object capturing function, and drawing a line perpendicular to l again using the "straight line" tool 1 Is denoted as l 2 The method comprises the steps of carrying out a first treatment on the surface of the The left mouse button clicks the drawing in the toolbar again, and the multi-section line drawing interface is popped up by clicking the multi-section line function with the left mouse button, so that the drawing interface is drawn by the line section l 1 One mouse left button is clicked once to draw a multi-section line by moving the mouse along the surface of the liquid bead for a short distance by taking one end point as a starting point until the multi-section line is connected with the line section l 2 Intersecting, and recording the multi-section line as l 3 The method comprises the steps of carrying out a first treatment on the surface of the The three lines can form a closed polygon, and the redundant length line segments are removed;
clicking the 'modification' in the toolbar by the left mouse button, clicking the 'merging' by the left mouse button, popping up a selection frame of the 'object to be merged', sequentially selecting three line segments by the frame, clicking the left mouse button, and displaying the line changed into a dotted line to indicate that the selection is successful; after the three line segments are successfully selected, clicking the right button of the mouse or clicking the Enter to combine the three line segments into a closed polygon;
the left mouse button clicks the drawing in the toolbar, then clicks the area, pops up the selection object frame, moves the mouse, makes the selection object frame select the multi-section line, clicks the left mouse button, clicks the right mouse button or clicks the Enter, and creates the area successfully;
clicking "drawing" in the toolbar by left mouse button, clicking "modeling", clicking "rotation", popping up the selection frame of "object to be rotated", selecting polygon with the selection frame and clicking left mouse button, clicking Enter or right mouse button, selecting "confirm" in the popped up dialog box and clicking mouse buttonMarking a left key; then the interface for selecting the rotation axis is popped up, and the left button of the mouse clicks the line segment l in turn 2 After the two endpoints of the R-F-R interface are popped up, the default rotation angle of software is 360 degrees, and the Enter is directly clicked;
clicking the formed wire frame graph by the left button of the mouse, clicking the view in the toolbar by the left button of the mouse, clicking the visual style again by the left button, and clicking the true again by the left button, so as to obtain a simulation graph of the liquid phase residual volume;
the left mouse button clicks a tool in the toolbar, the left mouse button clicks a query, then clicks a surface area/quality characteristic, pops up a selection object box, moves the mouse to enable the selection object box to select a graph, clicks the left mouse button, clicks the right mouse button or clicks an Enter, and obtains a required volume from the popped Auto CAD text box.
2. The measurement method of the measurement device for evaluating the hydrophobicity of a concrete surface according to claim 1, characterized in that: the base (1) is provided with a horizontal bubble instrument.
3. The measurement method of the measurement device for evaluating the hydrophobicity of the surface of concrete according to claim 2, characterized in that: leveling supporting feet (14) are respectively arranged at four corners of the bottom surface of the base (1).
4. The method for measuring the hydrophobicity of the concrete surface according to claim 3, wherein: the middle part of the front bracket (11) is provided with an LED lamp strip (11 a).
5. The method for measuring the hydrophobicity of the concrete surface according to claim 4, wherein: the front bracket (11) is of an inverted L-shaped structure.
6. The method for measuring the hydrophobicity of the concrete surface according to claim 5, wherein: the number of the spiral liquid feeders (6) is two, and the two spiral liquid feeders (6) are respectively arranged at two sides of the vertical imager (5).
7. The measurement method of the measurement device for evaluating the hydrophobicity of a concrete surface according to claim 6, characterized in that: the vertical imager (5) and the spiral liquid feeder (6) are provided with a knob (9) for adjusting the horizontal position.
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