Joint sealer for joint filling and reinforcing of ganged brick and preparation method of joint sealer

Abstract

The invention relates to a crack sealer for joint filling and reinforcing of ganged bricks and a preparation method of the crack sealer. The crack sealer comprises the following components in percentage by mass: 30-35% of quartz sand with the particle size of 0.125-0.25 mm, 30-35% of quartz sand with the particle size of 0.25-0.5 mm, 20-30% of natural hydraulic lime, 5.5-6.5% of titanium dioxide, 1% of cellulose ether, 1% of lignocellulose and 2% of dispersible rubber powder. The crack sealer for joint filling and reinforcing of ganged bricks, provided by the invention, is relatively high in strength and relatively good in toughness, can be relatively well combined with original mortar joint mortar, and is similar to an original brick surface crack sealer in color texture. The two working procedures of joint filling and joint pointing can be combined into a whole, the reinforcing effect is achieved, the artistic value of the plain brick wall is not damaged, and therefore the effect of reinforcing the historical plain brick wall in a lossless mode is achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of masonry structures, and particularly relates to a grout for filling and reinforcing seams of plain bricks and a preparation method thereof. Background Art

[0002] The exposed brick wall is an important form of masonry structure facade, which refers to the construction process of directly using bricks as the facing without other painting. The exposed brick wall combines the main structure with the facade decoration. In order to increase the aesthetic effect, the exposed bricks need to be additionally grouted. Grouting means that after the wall is built, some sand and ash are scratched off before the mortar solidifies, leaving space between the bricks, and filling it with cement mortar or mixed mortar. Common grouting forms include flat joints, oblique joints and convex joints (yuanbao joints). After grouting, the wall has a neat shape and beautiful rhythm, which fully reflects the aesthetic value of the masonry structure.

[0003] Brick walls are common in modern historical buildings. After more than a hundred years of excessive use and lack of maintenance, most brick walls have become structurally unstable and have insufficient bearing capacity. In order to protect historical buildings, single-sided support or the addition of a plastering surface layer is often used. However, these methods are not reversible, and they are also a kind of destruction to the style of historical buildings. They cannot be applied to the reinforcement of higher-grade masonry structures where both sides of the wall are not allowed to be damaged. In the above situation, the quality of the bricks themselves is often acceptable, and large-scale damage rarely occurs. The reason for the insufficient bearing capacity of the wall is the shedding of the grout on the brick surface and the deterioration of the performance of the mortar. If this type of mortar is repaired, the original structural bearing capacity can be partially restored, and even a preliminary structural reinforcement effect can be achieved.

[0004] Most of the mortar and grouting agents used in modern exposed brick walls are lime mortar, which has low strength and high toughness. The premixed mortar commonly used now has the characteristics of high strength and low toughness, and cannot be well integrated with the mortar joint materials of the original exposed brick wall, and may even reduce the existing structural strength. In addition, the color and texture of the premixed mortar are significantly different from the original lime mortar. If the premixed mortar is used directly for mortar joint repair, the artistic value of the exposed brick wall itself will be destroyed, and the grouting and beautification must be continued outside the repair surface, which is a complicated process.

[0005] Therefore, how to provide a grout for repairing and reinforcing the seams of plain bricks and a preparation method thereof is a technical problem that those skilled in the art urgently need to solve. Summary of the invention

[0006] The present invention provides a grout for repairing and reinforcing the seams of exposed bricks and a preparation method thereof. The grout has the characteristics of high strength, good toughness, good combination with the original mortar, and similar color and texture to the original brick surface grout. The grout is used to repair the seams of mortar, and the two processes of repairing and grouting can be combined into one, and the reinforcement effect can be achieved without destroying the artistic value of the exposed brick wall, thereby achieving the effect of non-destructive reinforcement of the historical exposed brick wall.

[0007] In order to solve the above technical problems, the present invention includes the following technical solutions:

[0008] A grout for repairing and reinforcing the seams of clear water bricks, wherein the mass fractions of the components of the grout are:

[0009] 30% to 35% of quartz sand with a particle size of 0.125 to 0.25 mm, 30% to 35% of quartz sand with a particle size of 0.25 to 0.5 mm, 20% to 30% of natural hydraulic lime, 5.5% to 6.5% of titanium dioxide, 1% of cellulose ether, 1% of wood cellulose, and 2% of dispersible rubber powder.

[0010] Furthermore, the natural hydraulic lime is NHL3.5 produced by Saint-Astier, France.

[0011] Furthermore, the titanium dioxide is domestically produced R-298.

[0012] Furthermore, the cellulose ether is produced by Shandong ETON.

[0013] Furthermore, the wood cellulose is German JRS wood fiber ARBOCEL BWW40 FD40.

[0014] Furthermore, the dispersible rubber powder is 5010N produced by VINNAPAS of Germany.

[0015] The present invention also provides a method for preparing a grout for repairing and reinforcing a clear brick joint, the method comprising the following steps:

[0016] Step S1, put the two kinds of quartz sand of the formula amount into a dry powder mixer, and stir them thoroughly for 5 minutes;

[0017] Step S2, putting the formulated amount of cellulose ether, wood cellulose and dispersible rubber powder into a dry powder mixer and stirring them thoroughly for 5 minutes;

[0018] Step S3, adding the formulated amount of natural hydraulic lime into a dry powder mixer and stirring for 25 minutes;

[0019] Step S4, adding the formulated amount of titanium dioxide into a dry powder mixer and stirring for 25 minutes;

[0020] Step S5: obtain the mixed material, discharge the material and bag it, with the stacking height not exceeding 1m.

[0021] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0022] The present invention provides a grout for repairing and reinforcing the seams of plain bricks, wherein the mass fractions of the components of the grout are:

[0023] 30% to 35% of quartz sand with a particle size of 0.125 to 0.25 mm, 30% to 35% of quartz sand with a particle size of 0.25 to 0.5 mm, 20% to 30% of natural hydraulic lime, 5.5% to 6.5% of titanium dioxide, 1% of cellulose ether, 1% of wood cellulose, and 2% of dispersible rubber powder.

[0024] The grouting agent for repairing and reinforcing the exposed brick provided by the present invention has high strength, good toughness, can be well combined with the original mortar, and has a color and texture similar to the original brick surface grouting agent. The two processes of repairing and grouting can be combined into one, and the reinforcement effect can be achieved without destroying the artistic value of the exposed brick wall, thereby achieving the effect of non-destructive reinforcement of the historical exposed brick wall. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic diagram of the grouting effect of a grouting agent for repairing and reinforcing the seams of plain bricks according to an embodiment of the present invention;

[0026] Figure 2 This is a schematic diagram of the effect of commercially available grouting agents;

[0027] Figure 3 This is a schematic diagram of the exposed bricks of the historical wall. DETAILED DESCRIPTION

[0028] The following is a further detailed description of a grout for repairing and reinforcing the seams of clear water bricks and a preparation method thereof provided by the present invention in conjunction with specific embodiments and drawings. The advantages and features of the present invention will become more apparent from the following description.

[0029] Embodiment 1: A grout for repairing and reinforcing the seams of plain bricks, wherein the mass fractions of the components of the grout are:

[0030] 30% to 35% of quartz sand with a particle size of 0.125 to 0.25 mm, 30% to 35% of quartz sand with a particle size of 0.25 to 0.5 mm, 20% to 30% of natural hydraulic lime, 5.5% to 6.5% of titanium dioxide, 1% of cellulose ether, 1% of wood cellulose, and 2% of dispersible rubber powder.

[0031] Particularly, the natural hydraulic lime is NHL3.5 produced in Saint-Astier, France.

[0032] Particularly, the titanium dioxide is domestically produced R-298.

[0033] Particularly, the cellulose ether is produced by Shandong ETON.

[0034] Particularly, the wood cellulose is German JRS wood fiber ARBOCEL BWW40 FD40.

[0035] In particular, the dispersible rubber powder is 5010N produced by VINNAPAS of Germany.

[0036] Quartz sand is the aggregate of the grout in this embodiment; natural hydraulic lime is the binder; titanium dioxide can make the material close to the color and texture of historical grout; cellulose ether is a water-retaining agent, which can increase the workability of the material; wood cellulose can improve the bonding strength of the material and play an anti-cracking role; dispersible glue powder will enhance the bonding strength, tensile strength and flexural strength of the grout material, and can effectively prevent the material from cracking.

[0037] The present invention also provides a method for preparing a grout for repairing and reinforcing a clear brick joint, the method comprising the following steps:

[0038] Step S1, put the two kinds of quartz sand of the formula amount into a dry powder mixer, and stir them thoroughly for 5 minutes;

[0039] Step S2, putting the formulated amount of cellulose ether, wood cellulose and dispersible rubber powder into a dry powder mixer and stirring them thoroughly for 5 minutes;

[0040] Step S3, adding the formulated amount of natural hydraulic lime into a dry powder mixer and stirring for 25 minutes;

[0041] Step S4, adding the formulated amount of titanium dioxide into a dry powder mixer and stirring for 25 minutes;

[0042] Step S5: obtain the mixed material, discharge the material and bag it, with the stacking height not exceeding 1m.

[0043] In this embodiment, commercially available grouts, the grouts of this application, and historical wall grouts (mortars) were selected for comparative experiments on plain brick walls, and material performance tests were performed in the following ways: compressive strength was tested with reference to "Test Method for Strength of Cement Mortar - GB / T17671-1999", shrinkage was tested with reference to "Test Method for Drying Shrinkage of Cement Mortar - GC / T603-2004", and setting time was tested with reference to "Test Method for Basic Performance of Building Mortar - JGJ70-2009". Specific data are shown in Table 1.

[0044] Table 1

[0045] index This application grout Commercial grout Historical wall grout / mortar Compressive strength 2~4MPa 5~7MPa 0.5~1MPa Shrinkage <0.1％ <0.1％ / Coagulation time 2～3h 3～4h /

[0046] illustrate:

[0047] ① In order to make the new grout have good synergistic performance with the historical grout and historical mortar, the strength of the new grout cannot be much higher than the historical grout or mortar. The ideal value is the strength of the new grout = 4 times the strength of the historical grout.

[0048] ② In order to facilitate construction operations, the grout should have a setting time of no less than 1 hour after mixing, but this time should not be too long, otherwise its initial setting time will be long, which may cause hidden dangers in the protection of finished products. The ideal value is 2 to 3 hours.

[0049] ③ In order to restore the look and texture of the historical grouting wall, the sand and gravel particle size and content were adjusted in this application, and a small amount of titanium dioxide was added (because the original grouting agent contained a large amount of lime, which caused the color to turn white after hardening). The color of the existing commercial grouting agent is grayish yellow brick soil color.

[0050] It can be seen that titanium dioxide can make the material close to the color and texture of the historical grout, but titanium dioxide affects the workability of the grout material. Therefore, through the material ratio of this application, not only the problem of adding titanium dioxide is solved, but also the strength is higher, the toughness is better, it can be well combined with the original mortar, and the color and texture are similar to the original brick surface grout. The two processes of filling and grouting can be combined into one, and the reinforcement effect can be achieved without destroying the artistic value of the exposed brick wall, thereby achieving the effect of non-destructive reinforcement of the historical exposed brick wall, which has good promotion value.

[0051] The above examples are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above embodiments. The above embodiments only express several embodiments of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for those of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A grout for repairing and reinforcing the seams of plain bricks, characterized in that: The mass fractions of the components of the grout are: 30% to 35% of quartz sand with a particle size of 0.125 to 0.25 mm, 30% to 35% of quartz sand with a particle size of 0.25 to 0.5 mm, 20% to 30% of natural hydraulic lime, 5.5% to 6.5% of titanium dioxide, 1% of cellulose ether, 1% of wood cellulose, and 2% of dispersible rubber powder.

2. The grout for repairing and reinforcing the clear water brick according to claim 1, characterized in that: The natural hydraulic lime is NHL3.5 produced by Saint-Astier, France.

3. The grout for repairing and reinforcing the clear water brick according to claim 1, characterized in that: The titanium dioxide is domestically produced R-298.

4. The grout for repairing and reinforcing the clear water brick according to claim 1, characterized in that: The cellulose ether was produced by Shandong ETON.

5. The grout for repairing and reinforcing the seams of clear water bricks according to claim 1, characterized in that: The wood cellulose is German JRS wood fiber ARBOCEL BWW40 FD40.

6. The grout for repairing and reinforcing the seams of the clear water bricks according to claim 1, characterized in that: The dispersible rubber powder is 5010N produced by VINNAPAS of Germany.

7. The method for preparing the grout for repairing and reinforcing the clear water brick according to claim 1, characterized in that: The steps include: Step S1, put the two kinds of quartz sand of the formula amount into a dry powder mixer, and stir them thoroughly for 5 minutes; Step S2, putting the formulated amount of cellulose ether, wood cellulose and dispersible rubber powder into a dry powder mixer and stirring them thoroughly for 5 minutes; Step S3, adding the formulated amount of natural hydraulic lime into a dry powder mixer and stirring for 25 minutes; Step S4, adding the formulated amount of titanium dioxide into a dry powder mixer and stirring for 25 minutes; Step S5: obtain the mixed material, discharge the material and bag it, with the stacking height not exceeding 1m.

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