CN107192793A - Distress in concrete grouting material concrete castability test method - Google Patents

Abstract

The invention provides a concrete crack grouting material groutability test method, the method comprises the following steps, step 1, the first proportion of the grouting material is poured into the grouting joint of the crack simulation test device, through the transparent left and right Observe the contact and fit relationship between the grouting material of the first proportion and the left and right side panels on the side panel; step 2, before the grouting material of the first proportion is not solidified, grout the grouting material of the first proportion in the grouting joint The grouting material is cleaned, and then the grouting material of the second proportion is poured into the grouting joint, and the contact and matching relationship between the grouting material of the second proportioning and the left and right side plates is observed through the transparent left and right side plates. The invention solves the problems in the prior art that the standards of concrete cracks are not uniform during the grouting test, and the groutability of the cracks in the longitudinal direction is not easy to observe.

Description

Test method for groutability of concrete crack grout

technical field

The invention relates to a method for testing the groutability of a concrete crack grouting material.

Background technique

In construction engineering, concrete will produce different forms of cracks due to reasons such as plastic shrinkage, temperature difference, uneven settlement, and excessive bearing capacity. Among them, surface cracks will accelerate the erosion of concrete, and deep cracks will cause leakage of the structure. Stability and security of the structure. Therefore, it is particularly important to repair the cracks in concrete in time. Pouring grout into concrete cracks is a common form of crack repair, but how to choose the most suitable grout for cracks of different widths and depths requires a comparative evaluation of the workability of grouts with different ratios. The groutability of the grout is an important index to evaluate its workability, but there is no standardized test method at present. During the groutability test of the grouting material, it is necessary to find a suitable crack for the grouting test. In the past, in the grouting test, the concrete beam specimen was first broken by the testing machine to form simulated cracks, and then the grouting material was poured into the cracks, and the grouting performance of the grouting material was judged by observing the filling degree of the grouting material to the cracks. . The problems of this test method are: (1) The simulated concrete cracks obtained by the flexural test can only be used once, and the simulated cracks obtained on different concrete specimens are inconsistent in cross-sectional structure and scale. Therefore, When it is necessary to compare the groutability of different proportions of grouting materials, it is impossible to draw a reasonable comparison conclusion because the reference grouting benchmarks are not uniform; (2) Due to the opacity of the concrete specimens, during the grouting test, It is only possible to observe the filling situation at the end of the crack, and it is difficult to observe the cooperation between the grouting material and the concrete crack surface, that is, the degree of filling of the entire crack by the grouting material, and it is difficult to obtain comprehensive groutability data and perform accurate groutability. sexual judgment. (3) Existing methods are costly, low in efficiency, and poor in comparability.

Contents of the invention

The purpose of the present invention is to provide a concrete crack grouting material groutability test method to solve the problems in the prior art that the concrete crack standards are not uniform during the grouting test, and the groutability of the cracks in the longitudinal direction is not easy to observe.

In order to achieve the above object, the technical solution adopted in the present invention is:

The concrete crack grouting material groutability test method, the method comprises the following steps, step 1, pouring the grouting material of the first kind of ratio into the grouting joint of the crack simulation test device, observing the first through the transparent left and right side plates The contact and fit relationship between the first proportioned grouting material and the left and right side panels; step 2, before the first proportioned grouting material is not cured, clean the first proportioned grouting material in the grouting joint, and then Pour the grouting material of the second proportion into the grouting joint, and observe the contact and fit relationship between the grouting material of the second proportioning and the left and right side plates through the transparent left and right side plates.

Preferably, in said step 2, when the grouting material of the first proportion in the grouting joint is cleaned, the mechanism fixing plate of the right side plate and the crack simulation test device is taken as a whole by the front of the crack simulation test device, The rear side panel is detached, and the left side panel and the right side panel are cleaned separately.

Preferably, in step 1, before pouring the grouting material of the first proportion into the grouting joint of the crack simulation test device, first adjust the distance between the left and right side plates through the distance adjustment mechanism, in step 2, Before pouring the second type of grouting material into the grouting joint of the crack simulation test device, adjust the distance between the left and right side plates so that the width of the grouting joint in step 2 is the same as that in step 1.

Preferably, in step 1 and step 2, the grouting material is injected into the grouting joint through a grouting material feeder.

Preferably, the grouting material feeder includes a barrel body with a discharge port, the discharge port is above the grouting joint, and a gate plate capable of adjusting the size of the discharge port is provided at the discharge port.

Preferably, the gate is mounted on the barrel body through the rotation of the gate shaft. Tighten the screws.

Preferably, at least one side of the arc-shaped slot hole is provided with an outlet adjustment scale.

The beneficial effects of the present invention are: in the present invention, concrete cracks in reality are simulated through the grouting joints of the crack simulation device, no need to press and fold the floor slab, the obtaining form of concrete cracks is simple, and it is also beneficial to the grouting in each grouting test The standards of the joints are consistent, and the groutability of different grouting materials can be compared more accurately. In addition, by observing the left and right sides of the transparent material in the length direction of the grouting joint, the grouting material can be clearly seen The fullness and pouring depth between the left and right side panels can be used to obtain a more comprehensive groutability data; before pouring another proportion of grouting material, the uncured grouting material should be cleaned to avoid the previous The influence of the grouting material on the subsequent grouting material also makes the cleaning of the grouting material more convenient, which is conducive to improving the test efficiency.

Description of drawings

Fig. 1 is a schematic structural view of a crack simulation device in Embodiment 1 of the present invention;

Fig. 2 is the top view of Fig. 1;

Fig. 3 is a schematic structural view of the crack simulation device in Embodiment 2 of the present invention;

Fig. 4 is a sectional view taken along line A-A of Fig. 3 .

detailed description

Embodiment 1 of concrete crack grouting material groutability test method is as shown in Figure 1-2:

The crack simulation test device involved in this method comprises a base plate 18 made of transparent material, on which a left side plate 14, a front side plate 25 and a rear side plate 24 are fixedly arranged, and the right ends of the front and rear side plates are fastened by threads The structure is connected with a mechanism fixing plate 19, and the screw fastening structure includes a first fastening screw 23 hinged on the right end of the front side plate and a second fastening screw hinged on the right end of the rear side plate. Corresponding to the screw hole through which the fastening screw is overturned, the mechanism fixing plate 19 has an inner convex positioning boss 30 protruding to the left, and the inner convex positioning boss 30 is positioned and matched with the gap between the front and rear side plates. There is a nut 23 in the uniform threaded connection. When the nut is loosened in use, the fastening screw can be pulled out from the corresponding screw hole. The nut does not need to be completely removed from the fastening screw to remove the mechanism fixing plate. The removal is very convenient, and it also avoids the problem of nut loss.

The mechanism fixed plate is connected with the right side plate 15 by the distance adjustment mechanism, and the distance adjustment mechanism connects the right side plate 15 and the mechanism fixed plate 19 into an integral structure, and the left and right positions of the right side plate can be adjusted by the distance adjustment mechanism, thereby adjusting the left and right sides. The spacing between the right side plates, the spacing adjustment mechanism includes the adjusting bolt 21 whose axis extends in the left and right direction, the adjusting bolt 21 is screwed with the mechanism fixing plate 19, and the spacing adjustment mechanism also includes the bearing 22 that the outer ring is connected with the right side plate, the bearing The inner ring of the inner ring is connected with the left end of the adjustment bolt 21. When the adjustment bolt 21 is rotated, the adjustment bolt 21 can drive the right side plate to move left and right through the bearing. The right side plate 15 guides and slidably cooperates with the front and rear side plates through a guide structure. The guide structure includes guide grooves 20 arranged on the inner side walls of the front and rear side plates extending in the left and right directions, and the corresponding guide recesses arranged on the front and back of the right side plate 15. Groove-fit guide lugs. At the same time, in order to simulate a more realistic concrete crack situation, the opposite sides of the left and right side panels are roughened to obtain greater roughness. In this embodiment, the front side panel, the rear side panel, the left side panel and the right side panel are all made of transparent material, and the transparent material is made of acrylic. Both the front and rear side plates are provided with horizontal scales 17 and vertical scales 16, the accurate spacing between the left and right side plates can be determined by the horizontal scales 17, and the grouting depth can be determined by the vertical scales 16. A grouting joint 13 with an open upper end is formed between the left and right side plates and the bottom plate, and the upper end of the left and right side plates is provided with a funnel-shaped structure 12 with a large top and a small bottom.

The base plate 18 is also provided with a grouting material discharger by a support 6, the grouting material discharger comprises a funnel-shaped barrel body 2 with a feed inlet 1, the barrel body is an inverted truncated square cone structure, and the outlet of the barrel body The material outlet 5 is a rectangular structure whose length extends along the front-to-back direction, and the length of the material outlet 5 matches the length of the grouting joint 13 . The grouting material feeder also includes a flashboard 11 arranged at the discharge port, the flashboard 11 is fixedly provided with a flashboard rotating shaft 10, and the barrel is provided with an axle sleeve 9, and the flashboard rotating shaft is rotatably matched with the axle sleeve. The rotating shaft of the flashboard passes through the shaft sleeve 9 and is connected with a turntable 8. The turntable is provided with an arc-shaped slot, and the side wall of the barrel body corresponding to the arc-shaped slot is provided with a turntable tightening screw 7. The turntables on both sides of the arc-shaped slot hole are provided with discharge opening adjustment scales 4 . The gate 11, the gate shaft 10, the bushing 9, the turntable 8, the turntable tightening screw 7 and the like form a valve structure that can accurately control the release rate of the grouting material. The outer edge of the inlet 1 can be fitted on the bracket 6 , and the bracket can be set so that the outlet 5 is just above the grouting seam 13 . The inner wall of the barrel body is provided with a capacity scale 3 that can determine the amount of grouting material poured in. During the test, the grouting material poured into the feeder is about 1.05 to 1.2 times the volume of the simulated crack when the simulated crack reaches the maximum set width. . The material of the grouting feeder is stainless steel or acrylic.

The concrete crack grouting material groutability test method comprises the following steps, step 1, pouring the grouting material of the first kind of proportion into the grouting joint of the crack simulation test device, observing the first kind of proportioning through the transparent left and right side plates The contact and fit relationship between the specific grouting material and the left and right side plates;

Step 2, before the grouting material of the first proportion is not cured, the grouting material of the first proportion in the grouting joint is cleaned, and then the grouting material of the second proportioning is poured into the grouting joint, Observe the contact and fit relationship between the second proportion of grouting material and the left and right side panels through the transparent left and right panels.

In said step 2, when the grouting material of the first proportion in the grouting joint is cleaned, the mechanism fixing plate of the right side plate and the crack simulation test device is taken as a whole by the front and rear side plates of the crack simulation test device Separately clean the left side panel and the right side panel.

In step 1, before pouring the grouting material of the first proportion into the grouting joint of the crack simulation test device, firstly adjust the distance between the left and right side boards through the distance adjustment mechanism, in step 2, place the second Before the grouting material of this kind of ratio is poured into the grouting joint of the crack simulation test device, adjust the spacing between the left and right side plates so that the width of the grouting joint in step 2 is the same as the width of the grouting joint in step 1.

In this method, the difference between the grouting material of the first proportion and the grouting material of the second proportion means that the components of the two grouting materials are different or the components are the same but the proportions of the different components are different.

Before grouting, the following preparatory work is required: 1. Prepare the cement paste mixer, crack simulation test device, grouting material feeder, material shovel, material tray and stopwatch and other test instruments.

2. The crack simulation test device and the grouting material feeder are assembled and installed in place, the grouting joint is adjusted to simulate the crack to the set width, and the discharge port is closed with a gate.

3. Prepare grouting materials with different proportions according to different purposes.

In the specific grouting process, the prepared grouting material is injected into the grouting material feeder at one time to the set volume scale, and the turntable is moved to drive the gate set at the discharge port of the feeder to the set position, so that The grouting material flows into the feeding port of the crack simulation test device at a uniform speed from the discharge port, and the stopwatch is started at the same time for timing.

When the grouting material fills the entire simulated crack under its own weight or stops pouring into the flow, observe the contact state between the grouting material and the simulated crack interface through the transparent left and right panels, and record the filling simulation with the help of a stopwatch and a vertical scale Infusion time, infusion fullness and infusion depth used for the fracture. (1) Infusion time: the time it takes for the grouting material to fill the entire simulated crack under the action of its own weight or stop pouring into the flow; (2) Filling fullness: the volume of the grouting material poured into the simulated crack after a specific time accounts for the volume of the simulated crack (3) Filling depth: the maximum depth that the grouting material can be poured into the simulated crack by its own weight

After the data recording is completed, the grout in the simulated crack is cleaned. According to different test accuracy, grouting can be done three times (or more times), and the average value is taken as the pouring time, filling fullness and pouring depth of the grouting material.

When in use, rotate the adjusting bolt to adjust the distance between the left and right side panels to a suitable distance. The groove structure can facilitate the filling of grouting materials. Since the left and right side panels and the front and rear side panels are made of transparent materials , observe the filling depth of the grouting material and the contact and fit between the grouting material and the left and right side plates, so you can obtain comprehensive groutability data to see if the grouting is full. Before the grouting material is solidified, remove the wing nut , to clean the grouting material to prevent the impact of the grouting material on the next grouting process. Since the right side plate and the mechanism fixing plate are an integral structure, the left side plate, front side plate, and rear side plate are an integral structure with the bottom plate, so The cleaning process of the whole device is simple and convenient. During the next grouting test, adjust the same distance between the left and right side plates and the previous test, pour another grouting material into the grouting joint, and pass the groutability data Compare to get the right mix of grout. The crack simulation device has a simple structure, is easy to use and clean, and can obtain comprehensive groutability data. At the same time, it also enables the grouting materials of various proportions to be tested under the same crack standard, and the obtained data is more comparable. The grouting material with suitable ratio can be compared in a short time, which greatly improves the test efficiency.

In other embodiments of the present invention: when it is necessary to test more than three kinds of grouting materials, the third step and the fourth step can also be carried out; the spacing adjustment mechanism can also not use the threaded adjustment mechanism of the adjusting bolt, such as It is said that the spacing adjustment mechanism is an adjustment mechanism that can drive the movement of the right side plate, such as a drive cylinder and an electric push rod; of course, the spacing adjustment mechanism can also be connected to the left and right side panels at the same time to realize the adjustment of the distance between the left and right side panels The guide groove on the front and rear side plates and the corresponding guide block on the right side plate can also be omitted. At this time, the right side plate can guide and cooperate with the front and rear side plates only through its side.

Example 1 of the concrete crack grouting material groutability test method is shown in Figure 3-4: the difference between embodiment 2 and embodiment 1 is that the right side plate of the crack simulation test device includes two right side plates arranged at intervals from left to right The first part 15-1 and the second part 15-2 of the right side panel, the first part of the right side panel and the second part of the right side panel are connected by a connecting body, and the grouting joint 13 is formed between the left side panel 14 and the first part of the right side panel Between 15-1. Mechanism fixed plate 19 comprises two mechanism fixed plate first parts 19-1 and the mechanism fixed plate second part 19-2 that are set up against, on the mechanism fixed plate, is embedded with the adjustment nut 31 that cooperates with adjusting bolt 21, and adjusting bolt 21 A bearing 22 is arranged between the left end of the left side and the second part 15-2 of the right side plate.

The fastening screw 23 is fixed on the screw fixing seat 4, and the screw fixing seat 4 is fixed on the corresponding side plate, and the screw rod perforation for the fastening rod 23 that does not extend to the side of the mechanism fixing plate is provided on the mechanism fixing plate. .

Claims (7)

1. concrete crack grouting material groutability test method is characterized in that the method comprises the following steps: step 1, the grouting material of the first kind of proportioning is poured in the grouting joint of crack simulation test device, through transparent left and right Observe the contact and fit relationship between the grouting material of the first proportion and the left and right side panels on the side panel; Step 2, before the grouting material of the first proportion is not cured, the grouting material of the first proportion in the grouting joint is cleaned, and then the grouting material of the second proportioning is poured into the grouting joint, Observe the contact and fit relationship between the second proportion of grouting material and the left and right side panels through the transparent left and right panels. 2. The concrete crack grouting material groutability test method according to claim 1 is characterized in that: in said step 2, when the grouting material of the first kind of proportioning in the grouting joint is cleaned, the right side plate The mechanism fixing plate of the crack simulation test device is detached from the front and rear side plates of the crack simulation test device as a whole, and the left side plate and the right side plate are cleaned separately. 3. The concrete crack grouting material groutability test method according to claim 1 or 2 is characterized in that: in step 1, before the grouting material of the first kind of proportioning is poured in the grouting joint of the crack simulation test device , first adjust the distance between the left and right side panels through the spacing adjustment mechanism. Spacing so that the width of the grout joint in step 2 is the same as the width of the grout joint in step 1. 4. The test method for groutability of concrete crack grouting material according to claim 1, characterized in that: in step 1 and step 2, the grouting material is injected into the grouting joint through a grouting material feeder. 5. concrete crack grouting material groutability test method according to claim 5, is characterized in that: described grouting material feeder comprises the bucket body with discharge port, and discharge port is at the top of grouting joint, and discharge There is a gate at the mouth that can adjust the size of the discharge port. 6. The concrete crack grouting material groutability test method according to claim 5 is characterized in that: the ram is assembled on the barrel through the rotation of the ram shaft, the ram is fixed with a turntable, and the turntable is provided with The arc-shaped slot hole is provided with a turntable tightening screw passing through the arc-shaped slot hole on the barrel body. 7. The test method for groutability of concrete crack grouting material according to claim 6, characterized in that: at least one side of the arc-shaped slot hole is provided with an outlet adjustment scale.