Waterproof mortar with root resistance and sag resistance and preparation method thereof

Abstract

The application discloses a root-resistant and sag-resistant waterproof mortar and a preparation method thereof. The components of the waterproof mortar by weight specifically comprise: cement 35-50%; quartz sand 45-60%; latex powder 1.5-3%; gelling agent 1 2-4%; gelling agent 2 1-2%; thixotropic agent 0.1-0.4%; anti-cracking fiber 0.1-0.3%; water reducing agent 0.05-0.1%; and root inhibitor 0.1-0.3%. The waterproof mortar is prepared by mixing the components and water in a weight ratio of 100:13-15, and then stirring uniformly, and can be used in construction. The product of the application comprehensively adopts various innovative technologies, utilizes colloid chemistry, grid technology, interface effect physics and chemical action, and can realize good construction performance on inclined vertical surfaces, high strength, high impermeability and penetration resistance of plant root hairs.

Description

Technical Field

[0001] This invention relates to the field of building waterproofing materials technology, and more specifically, to a root-resistant and anti-sagging waterproof mortar and its preparation method. Background Technology

[0002] Currently, polymer cement waterproof mortar, also known as polymer-modified cement waterproof mortar, is classified into dry powder type (i.e., single-component type) and emulsion type (i.e., two-component type) according to the "Polymer Cement Waterproof Mortar" standard. Among them, dry powder polymer cement waterproof mortar is more widely used due to its advantages such as convenient packaging and transportation.

[0003] With the implementation of GB55030-2022, the mandatory standard for waterproofing in building and municipal engineering, it is stipulated that only Type II standard waterproofing mortar can be used. Compared to the original Type I standard waterproofing mortar, which is made of cement, fine sand or river sand (40-60 mesh), latex powder, cellulose, etc., Type II standard waterproofing mortar requires a large amount of coarser sand (10-30 mesh) and a small amount of fine sand for preparation. It has better waterproofing performance, but the technical requirements are also higher. Moreover, it has been found in construction applications that Type II standard waterproofing mortar has a larger density, specifically reaching 1.7-1.8 tons / m³. 3 It far exceeds the density value of Type I waterproof mortar, which is 1.3-1.4 tons / m³. 3 This causes the mortar to sag and drip easily when applied to building slopes and facades, resulting in a fish-scale-like appearance. After drying, the mortar layer develops numerous cracks, leading to waterproofing failure. At the same time, the Type II waterproof mortar layer is also easily penetrated by plant roots. Well-developed tree roots can directly penetrate the mortar layer, causing it to crack and bulge. Summary of the Invention

[0004] To address these issues, this invention provides a root-resistant and anti-sagging waterproof mortar and its preparation method. This addresses the problems of existing Type II waterproof mortar, which has a high density during construction, leading to sagging and dripping on sloping and vertical surfaces, resulting in a fish-scale-like appearance. Furthermore, the mortar layer develops numerous cracks after drying, causing reduced or even failed waterproofing performance. Additionally, Type II waterproof mortar is easily penetrated by plant roots, with developed tree roots directly penetrating the mortar layer, causing cracking and bulging.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] According to a first aspect of the present invention, a root-resistant and anti-sagging waterproof mortar is provided, comprising, by weight, the following components:

[0007] The cement content is set at 35 to 50 parts by weight relative to 100 parts by weight of the whole;

[0008] Quartz sand, with a content of 45 to 60 parts by weight relative to 100 parts by weight of the whole;

[0009] Latex powder, with a content of 0.8 to 1.5 parts by weight relative to 100 parts by weight of the whole;

[0010] Gelling agent 1, with a content of 2 to 4 parts by weight relative to 100 parts by weight of the whole;

[0011] Gelling agent 2, with a content of 1 to 2 parts by weight relative to 100 parts by weight of the whole;

[0012] The thixotropic agent is present in a content of 0.1 to 0.4 parts by weight relative to 100 parts by weight of the whole.

[0013] The content of crack-resistant fiber is set at 0.1 to 0.3 parts by weight relative to 100 parts by weight of the whole;

[0014] The water-reducing agent is set at a content of 0.05 to 0.1 parts by weight relative to 100 parts by weight of the whole.

[0015] The root inhibitor is prepared at a concentration of 0.1 to 0.3 parts by weight relative to 100 parts by weight of the whole.

[0016] Based on the above technical solution, the present invention is further described as follows:

[0017] As a further embodiment of the present invention, the quartz sand is composed of three types of quartz sand with different sand grades: #1, #2, and #3.

[0018] As a further embodiment of the present invention, the gelling agent 1 is one or both of neutral silica sol powder and acidic silica powder, and the neutral silica sol powder and the acidic silica powder are 1-100μm powders.

[0019] As a further embodiment of the present invention, the root inhibitor is configured as a plant root growth regulator, 3'-chloroacetone benzene.

[0020] As a further embodiment of the present invention, the latex powder is set as polyethylene-vinyl acetate latex powder, and its glass transition temperature Tg = 0-5℃.

[0021] As a further embodiment of the present invention, the gelling agent 2 is powdered aluminum sulfide.

[0022] As a further embodiment of the present invention, the thixotropic agent is an organically modified bentonite, and the carbon chain length of the cationic surfactant that exchanges with Na+ in the bentonite is greater than 16.

[0023] As a further embodiment of the present invention, the crack-resistant fiber is one or more of polyvinyl alcohol fiber, polyacrylic acid fiber, and nylon fiber.

[0024] As a further embodiment of the present invention, the water-reducing agent is configured as a powdered polycarboxylate high-efficiency water-reducing agent.

[0025] According to a second aspect of the present invention, a method for preparing a root-resistant and anti-sagging waterproof mortar is provided, comprising the following steps:

[0026] Preparation of powdered gelling agent 1;

[0027] The specific process is as follows: Add 5-8% ethanol by weight of silica sol, stir evenly, cool to -5 to -10℃, put into a sealed container, and remove the volatile components under vacuum (pressure 90 to 100 kPa) until the solid content is greater than 99.5%. Then, at low temperature (-5 to -10℃), it is high-frequency pulverized into powder with a particle size of 1 to 100 μm.

[0028] Preparation of root-resistant and sagging-resistant waterproof mortar;

[0029] The specific process is as follows: Add No. 3 quartz sand to the mixing tank according to the quartz sand ratio, start the mixer at a speed of 60-80 r / min, and slowly add the liquid root inhibitor 3'-chloroacetone benzene while stirring. Stir for 15-25 min, then add latex powder, gelling agent 1, gelling agent 2, thixotropic agent, crack-resistant fiber and water-reducing agent according to the ratio, and continue stirring for 20-30 min. Finally, add cement, No. 1 quartz sand and No. 2 quartz sand according to the ratio and stir evenly.

[0030] The present invention has the following beneficial effects:

[0031] 1. Excellent construction feasibility of sloping facades;

[0032] Through colloidal chemistry, mesh technology, and physical and chemical measures of interface effect, the invented Type II waterproof mortar not only performs well on flat surfaces, but also does not sag, drip, or crack when applied to inclined vertical surfaces.

[0033] 2. Root suppression performance;

[0034] Inhibiting or desensitizing the growth of plant roots prevents roots from damaging the waterproof mortar layer, thus protecting the waterproof layer and maintaining its durability.

[0035] 3. High strength;

[0036] Using high-grade cement, the waterproof mortar achieves a 28-day compressive strength greater than 65 MPa, a flexural strength greater than 8 MPa, and a bond strength greater than 1.8 MPa.

[0037] 4. High resistance to seepage pressure;

[0038] By employing graded sand, latex powder, and high-efficiency water-reducing agents, the waterproof mortar has a seepage resistance pressure exceeding 1.5 MPa, meeting the needs of waterproofing projects. Attached Figure Description

[0039] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. The structures, proportions, sizes, etc., drawn in this specification are only used to complement the content disclosed in the specification, so that those skilled in the art can understand and read them. Any modifications to the structure, changes in the proportional relationships, or adjustments to the size, without affecting the effects and objectives that the present invention can produce, should still fall within the scope of the technical content disclosed in the present invention.

[0040] Figure 1 This is a schematic diagram showing the components and weight ratios of the root-resistant and anti-sagging waterproof mortar provided in an embodiment of the present invention. Detailed Implementation

[0041] The following specific embodiments illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0042] The terms "upper," "lower," "left," "right," and "middle" used in this specification are merely for clarity of description and are not intended to limit the scope of the invention. Any changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of the invention.

[0043] To address the performance and construction requirements of waterproof mortars under the new circumstances and meet the needs of waterproofing projects, this invention comprehensively employs multiple innovative technologies, utilizing colloidal chemistry, mesh technology, and the physical and / or chemical effects of interface effects to develop a root-resistant and anti-sagging waterproof mortar with excellent comprehensive performance. This root-resistant and anti-sagging waterproof mortar exhibits good flat-surface application and is less prone to sagging, dripping, and cracking on inclined vertical surfaces. Simultaneously, it can inhibit or passivate the growth of plant roots, preventing root damage to the waterproof mortar layer and maintaining the durability of the waterproof layer. Furthermore, this root-resistant and anti-sagging waterproof mortar has high compressive strength, flexural strength, and bond strength, exhibiting strong resistance to seepage pressure and effectively meeting the needs of waterproofing projects. Please refer to [reference needed]. Figure 1 Its specific components include the following:

[0044] The composition comprises cement, quartz sand, latex powder, cementitious agent 1, cementitious agent 2, thixotropic agent, crack-resistant fiber, water-reducing agent, and root inhibitor, wherein, by weight, the cement content is 35-50 parts by weight relative to 100 parts by weight, the quartz sand content is 45-60 parts by weight relative to 100 parts by weight, the latex powder content is 0.8-1.5 parts by weight relative to 100 parts by weight, and the cementitious agent 1 content is 2-4 parts by weight relative to 100 parts by weight. The content of the gelling agent 2 is set at 1 to 2 parts by weight relative to 100 parts by weight of the whole, the content of the thixotropic agent is set at 0.1 to 0.4 parts by weight relative to 100 parts by weight of the whole, the content of the crack-resistant fiber is set at 0.1 to 0.3 parts by weight relative to 100 parts by weight of the whole, the content of the water-reducing agent is set at 0.05 to 0.1 parts by weight relative to 100 parts by weight of the whole, and the content of the root suppressant is set at 0.1 to 0.3 parts by weight relative to 100 parts by weight of the whole.

[0045] The root-resistant and anti-sagging waterproof mortar, prepared from the above components, can be mixed with water at a weight ratio of 100:13-15 and then applied. Its working principle is as follows:

[0046] When root-resistant and anti-sagging waterproof mortar is mixed with water at a weight ratio of 100:13-15, a series of complex physical or chemical reactions occur between the components and / or between them, including:

[0047] High-strength ordinary Portland cement begins to hydrate, producing a series of hydrates including dicalcium silicate, tricalcium silicate, and tetracalcium aluminoferrite. These hydrates provide the mortar with compressive strength, flexural strength, and bond strength. As hydration progresses, it releases heat of hydration, accelerating the reaction between the cement itself and other components.

[0048] As an optional solution in this embodiment, the cement may be, but is not limited to, ordinary silicate high-grade cement with specifications of P.O52.5 or P.O62.5.

[0049] In a preferred embodiment of this invention, the quartz sand, as an aggregate filler, is an inert material that serves a filling function. The quartz sand in this embodiment is composed of three grades: #1, #2, and #3. The mass ratio of #1, #2, and #3 quartz sand is 1:1–1.5:0.3–0.6. While #1 coarse sand is beneficial for mortar strength, it is not used entirely to avoid the problem of high mortar density and sagging during vertical construction. The mesh size of #1 quartz sand is 10–16 mesh (1–1.6 mm), allowing for a mortar thickness of 3 mm with one coat and 6 mm with two coats, as per specifications. #2 quartz sand has a mesh size of 20–30 mesh, and #3 quartz sand has a mesh size of 40–50 mesh. Using some fine sand as filler for the coarse sand further improves the smoothness of the mortar surface.

[0050] The latex powder is a polyethylene-vinyl acetate latex powder with a glass transition temperature (Tg) of 0–5°C. This latex powder increases bonding strength and improves lateral deformation, impermeability, and water tightness. Polyethylene-vinyl acetate latex powder is chosen because it dissolves more easily in mortar. Furthermore, using a latex powder with a higher glass transition temperature is more beneficial for bonding strength. Excessive latex powder should not be added, otherwise the mortar will become too viscous, making construction difficult.

[0051] The gelling agent 1 is one or both of neutral silica sol powder and acidic silica powder, and the neutral silica sol powder and the acidic silica powder are 1-100μm powders.

[0052] The gelling agent 1 used in this embodiment of the invention is silica sol powder, which is a powder. Since silica sol is conventionally a liquid, it needs to be pre-prepared as a powder. Because silica sol loses its activity through solvent crosslinking as its concentration increases at room temperature, this embodiment of the invention limits its activity at low temperatures to reduce condensation and crosslinking. Moisture is removed through vacuum drying, and then the powder is pulverized into micron-sized fine powder at low temperature using high-frequency grinding to maximize the preservation of silica activity in the silica sol. Furthermore, the gelling agent 1 does not use alkaline silica sol because the silica in alkaline silica sol is more active than neutral and acidic silica, and it easily crosslinks and condenses during dehydration, losing its activity.

[0053] When silica sol powder encounters the alkaline hydration solution of cement and calcium and aluminum polyvalent ions, it rapidly forms a gel and undergoes condensation and dehydration, resulting in the following reactions, equations (a) and (b) as follows:

[0054] Na2O.nS i O2 + (n+1)H2O = 2N a OH+nS i (OH)4……(a)

[0055]

[0056] As shown in reaction (b), the silica sol generates a cross-linked three-dimensional network structure, and the -Si-O- bonds are chemical bonds with high bond energy and greater stability. In the mortar system, it acts like a net to hold other components in the lattice. Furthermore, the generated silica gel itself is stable, does not flow, and has a good fixing effect, which is the main factor affecting the mortar sloping surface construction in the embodiments of the present invention from sagging.

[0057] The gelling agent 2 is powdered aluminum sulfide, which also adopts the principle of silica sol technology. It is a further functional supplement to the silica sol anti-sag mortar technology. Aluminum sulfide reacts rapidly in water, especially under the heat of cement hydration, and the reaction formulas (c) and (d) are as follows:

[0058] Al2S3+6H2O=2Al(OH)3+3H2S…… (c)

[0059] H2S+ Ca(OH)2= CaS+ 2H2O…… (d)

[0060] Aluminum hydroxide, generated by the double hydrolysis of aluminum sulfide, is in a gel state and also plays a role in fixing mortar components. However, since aluminum hydroxide molecules form gels only through weak bonds, it is difficult to fix large particles of quartz sand by relying solely on aluminum hydroxide gel. Nevertheless, aluminum hydroxide gel can serve as a good functional supplement to silica sol gel.

[0061] As a preferred embodiment, the thixotropic agent is organically modified bentonite, and the carbon chain length of the cationic surfactant that exchanges with Na+ in bentonite is greater than 16.

[0062] First, organic bentonite has weaker hydrophilicity than inorganic bentonite. The mortar in the embodiment of the present invention is thicker during construction, and the organic bentonite can be more easily dispersed in the mortar by using mechanical stirring.

[0063] Secondly, the organic bentonite is produced by reacting sodium-based bentonite with an organic covering agent. In this embodiment of the invention, sodium-based bentonite reacted with a cationic surfactant with a carbon chain length greater than 16 is selected, rather than a low-length carbon chain cationic surfactant. This is primarily because organic bentonite prepared with long-chain cationic surfactants exhibits a stronger hydrophobic interface with the mortar. Generally, the better the affinity between components, the more favorable the mortar flow. Therefore, this embodiment of the invention uses a long-chain cationic surfactant to increase the hydrophobic interface effect between components, which is more conducive to mortar anti-sagging and improves the construction effect of mortar on sloping vertical surfaces.

[0064] As an optional solution in this embodiment, the crack-resistant fiber is one or more of polyvinyl alcohol fiber, polyacrylic acid fiber, and nylon fiber. The crack-resistant fiber can prevent shrinkage cracks caused by excessive thickness or uneven thickness of the waterproof mortar in one application. Since the thickness of the waterproof mortar does not exceed 6mm, the length of the crack-resistant fiber is selected to be 6-12mm and the filament diameter is selected to be 1-2μm.

[0065] The water-reducing agent is a powdered polycarboxylate high-efficiency water-reducing agent with a cement paste fluidity greater than 320 mm. By selecting a polycarboxylate high-efficiency water-reducing agent, the amount of water used in mortar mixing can be reduced, which is more beneficial to strength. The traditional dosage of polycarboxylate high-efficiency water-reducing agent in mortar is 0.2%, while the dosage in this embodiment of the invention is reduced to 0.05-0.1%. The reason for this is that the high-efficiency water-reducing agent is a strong dispersant, which can enhance the affinity between components through interfacial charge action, thereby reducing water usage. However, one objective of this embodiment of the invention is to reduce sag during construction on sloping facades; therefore, the dosage is reduced to 0.05-0.1% to reduce the affinity between components and decrease fluidity.

[0066] The root inhibitor is a plant root growth regulator, which is an effective component to prevent plant roots from penetrating the mortar waterproof layer. It has the function of inhibiting and passivating plant root growth. For example, 3'-chloroacetone benzene, after the plant roots come into contact with the root inhibitor, they are passivated and stop growing, thus preventing the roots from damaging the waterproof mortar layer and effectively protecting the waterproof layer.

[0067] This invention also provides a method for preparing root-resistant and anti-sagging waterproof mortar, which specifically includes the following steps:

[0068] S1: Prepare powdered gelling agent 1;

[0069] The specific process is as follows: Add 5-8% ethanol by weight of silica sol, stir evenly, cool to -5 to -10℃, put into a sealed container, and remove the volatile components under vacuum (pressure 90 to 100 kPa) until the solid content is greater than 99.5%. Then, at low temperature (-5 to -10℃), it is high-frequency pulverized into powder with a particle size of 1 to 100 μm.

[0070] S2: Preparation of root-resistant and anti-sagging waterproof mortar;

[0071] The specific process is as follows: Add No. 3 quartz sand to the mixing tank according to the quartz sand ratio, start the mixer at a speed of 60-80 r / min, and slowly add the liquid root inhibitor 3'-chloroacetone benzene while stirring. Stir for 15-25 min, then add latex powder, gelling agent 1, gelling agent 2, thixotropic agent, crack-resistant fiber and water-reducing agent according to the ratio, and continue stirring for 20-30 min. Finally, add cement, No. 1 quartz sand and No. 2 quartz sand according to the ratio and stir evenly.

[0072] Based on the preparation method provided in the embodiments of the present invention, the following further preferred examples are described:

[0073] Example 1, its preparation method includes the following steps:

[0074] For the preparation of gelling agent 1: Add 6% by weight of ethanol to silica sol, stir evenly and cool to -5 to -10℃, put into a sealed container, and remove volatile components under vacuum (pressure 90 to 100 kPa) until the solid content is greater than 99.5%, and then pulverize into powder with a particle size of 1 to 100 μm at low temperature (-5 to -10℃).

[0075] For the preparation of waterproof mortar: Add 7 parts of No. 3 quartz sand to the mixing tank, start the mixer, and rotate at 60-80 r / min. While stirring, slowly add 0.15 parts of 3'-chloroacetone benzene and stir for 15-25 min. Then add 2.1 parts of latex powder, 1.5 parts of gelling agent 1, 1.21 parts of aluminum sulfide, 0.26 parts of organobentonite, 0.12 parts of polyvinyl alcohol fiber, and 0.06 parts of polycarboxylate superplasticizer. Continue stirring for 20-30 min. Finally, add 37.3 parts of P.O52.5 cement, 20 parts of No. 1 quartz sand, and 30.3 parts of No. 2 quartz sand, and stir evenly.

[0076] Example 2, its preparation method includes the following steps:

[0077] For the preparation of gelling agent 1: Add 8% by weight of ethanol to silica sol, stir evenly and cool to -5 to -10℃, put into a sealed container, and remove volatile components under vacuum (pressure 90 to 100 kPa) until the solid content is greater than 99.5%, and then pulverize into powder with a particle size of 1 to 100 μm at low temperature (-5 to -10℃).

[0078] For the preparation of waterproof mortar: Add 8 parts of No. 3 quartz sand to the mixing tank, start the mixer, and rotate at 60-80 r / min. While stirring, slowly add 0.21 parts of 3'-chloroacetone benzene and stir for 15-25 min. Then add 1.8 parts of latex powder, 2.2 parts of binder 1, 1.6 parts of aluminum sulfide, 0.4 parts of organobentonite, 0.21 parts of polyacrylic acid fiber, and 0.06 parts of polycarboxylate superplasticizer. Continue stirring for 20-30 min. Finally, add 48 parts of P.O62.5 cement, 16 parts of No. 1 quartz sand, and 21.5 parts of No. 2 quartz sand, and stir evenly.

[0079] Example 2, its preparation method includes the following steps:

[0080] For the preparation of gelling agent 1: 7% by weight of ethanol of silica sol was added, stirred evenly and cooled to -5 to -10℃, put into a sealed container, and the volatile components were removed under vacuum (pressure 90 to 100 kPa) until the solid content was greater than 99.5%. Then, it was pulverized at low temperature (-5 to -10℃) by high frequency into powder with a particle size of 1 to 100 μm.

[0081] For the preparation of waterproof mortar: Add 7.4 parts of No. 3 quartz sand to the mixing tank, start the mixer, and rotate at 60-80 r / min. While stirring, slowly add 0.26 parts of 3'-chloroacetone benzene and stir for 15-25 min. Then add 3.2 parts of latex powder, 3.57 parts of binder 1, 1.4 parts of aluminum sulfide, 0.33 parts of organobentonite, 0.24 parts of nylon fiber, and 0.1 parts of polycarboxylate superplasticizer. Continue stirring for 20-30 min. Finally, add 42 parts of P.O52.5 cement, 17.4 parts of No. 1 quartz sand, and 24.1 parts of No. 2 quartz sand, and stir evenly.

[0082] Performance tests were conducted on the root-barrier and anti-sagging waterproof mortars prepared in Examples 1 to 3 above:

[0083] The product of this invention was tested according to the standard test methods of JC / T984-2011 "Polymer Cement Waterproof Mortar", JG / T157 "Putty for Building Exterior Walls", and GB / T35468-2017 "Root Penetration Resistant Waterproof Membrane for Green Roofs". The test results are shown in Table 1 below.

[0084]

[0085] Table 1 shows the test results of root-barrier and anti-sagging waterproof mortar products prepared in Examples 1 to 3.

[0086] As can be seen from Examples 1 to 3, the root-resistant and anti-sagging waterproof mortar prepared in the embodiments of the present invention meets the standards when tested according to the relevant standard test methods, and some indicators far exceed the standard requirements.

[0087] Continuing with the design of comparative examples based on Example 1 and Example 2 of the preparation methods of the embodiments of the present invention:

[0088] Comparative Example 1:

[0089] Add 7.4 parts of No. 3 quartz sand to the mixing tank, start the mixer, and rotate at 60-80 r / min. While stirring, slowly add 0.26 parts of 3'-chloroacetone benzene and stir for 15-25 min. Then add 3.2 parts of latex powder, 0.33 parts of organobentonite, 0.24 parts of polyvinyl alcohol fiber, and 0.1 parts of polycarboxylate superplasticizer. Continue stirring for 20-30 min. Finally, add 42 parts of P.O52.5 cement, 17.4 parts of No. 1 quartz sand, and 29.07 parts of No. 2 quartz sand and stir evenly to obtain the waterproof mortar product of Comparative Example 1.

[0090] Comparative Example 2:

[0091] For the preparation of gelling agent 1: Add 8% ethanol by weight of silica sol, stir evenly and cool to -5 to -10℃, put into a sealed container, and remove volatile components under vacuum (pressure 90 to 100 kPa) until the solid content is greater than 99.5%, and then pulverize into powder with a particle size of 1 to 100 μm at low temperature (-5 to -10℃).

[0092] For the preparation of waterproof mortar: 8 parts of No. 3 quartz sand, 1.8 parts of latex powder, 2.2 parts of cementitious agent 1, 1.6 parts of aluminum sulfide, 0.4 parts of organic bentonite, 0.21 parts of polyacrylic acid fiber and 0.06 parts of polycarboxylate superplasticizer were added to the mixing tank. The mixer was started and the speed was 60-80 r / min. The mixture was stirred for 15-25 min. Finally, 48 parts of P.O62.5 cement, 16 parts of No. 1 quartz sand and 21.71 parts of No. 2 quartz sand were added and stirred evenly to obtain the waterproof mortar of Comparative Example 2.

[0093] The test results of the waterproof mortar in Comparative Example 1 and Comparative Example 2 are shown in Table 2 below.

[0094]

[0095]

[0096] Table 2. Test results of waterproof mortar in Comparative Example 1 and Comparative Example 2

[0097] Compared to Example 1 of this invention, Comparative Example 1 did not include the gel materials corresponding to silica sol and aluminum sulfide, while other conditions remained the same. The test results show that the mortar did not flow or sag immediately after construction on the sloping facade, but signs of sagging appeared afterward, indicating that the mortar did not quickly develop strong thixotropy after construction. Organic bentonite has a certain effect on the mortar's anti-sagging properties (effective in the short term), but without the grid effect and gelation effect formed by silica sol and aluminum sulfide, the thixotropy of the mortar cannot be well demonstrated. Furthermore, the mortar constructed on the sloping facade developed numerous fine cracks due to sagging, and even with the addition of a root-stopping agent, plant roots could still penetrate the mortar waterproofing layer.

[0098] Comparative Example 2, compared to Example 2 of the present invention, did not include a root-stopping agent, but all other conditions were the same. The test results show that the mortar on the sloping vertical surface exhibited no sagging or dripping, and construction was unimpeded, thanks to the addition of silica sol, aluminum sulfide, and organobentonite materials. However, due to the absence of a root-stopping agent, the mortar layer developed cracks after 6 months as plant roots grew into or penetrated it, leading to the failure of the waterproof layer.

[0099] Although the present invention has been described in detail above with general descriptions and specific embodiments, modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, all such modifications or improvements made without departing from the spirit of the present invention fall within the scope of protection claimed by the present invention.

Claims

1. A root-resistant and anti-sagging waterproof mortar, characterized in that, By weight, it comprises the following components: The cement content is set at 35-50 parts by weight relative to 100 parts by weight of the whole; Quartz sand, with a content of 45-60 parts by weight relative to 100 parts by weight of the whole; Latex powder, with a content of 0.8 to 1.5 parts by weight relative to 100 parts by weight of the whole; Gelling agent 1, with a content of 2 to 4 parts by weight relative to 100 parts by weight of the whole; Gelling agent 2, with a content of 1 to 2 parts by weight relative to 100 parts by weight of the whole; The thixotropic agent is present in a content of 0.1 to 0.4 parts by weight relative to 100 parts by weight of the whole. The content of crack-resistant fiber is set at 0.1 to 0.3 parts by weight relative to 100 parts by weight of the whole; The water-reducing agent is set at a content of 0.05 to 0.1 parts by weight relative to 100 parts by weight of the whole. The root suppressant is prepared at a concentration of 0.1 to 0.3 parts by weight relative to 100 parts by weight of the whole. The gelling agent 1 is one or both of neutral silica sol powder and acidic silica powder, and the neutral silica sol powder and the acidic silica powder are 1~100μm powders; The gelling agent 2 is powdered aluminum sulfide.

2. The root-resistant and anti-sagging waterproof mortar according to claim 1, characterized in that, The quartz sand is composed of three types of quartz sand with different sand grades: #1, #2, and #3.

3. The root-resistant and anti-sagging waterproof mortar according to claim 2, characterized in that, The root-suppressing agent is 3'-chloroacetone benzene, a plant root growth regulator.

4. The root-resistant and anti-sagging waterproof mortar according to claim 1, characterized in that, The latex powder is a polyethylene-vinyl acetate latex powder with a glass transition temperature Tg of 0~5℃.

5. The root-resistant and anti-sagging waterproof mortar according to claim 1, characterized in that, The thixotropic agent is an organically modified bentonite, and the cationic surfactant that exchanges Na+ with the bentonite has a carbon chain length greater than 16.

6. The root-resistant and anti-sagging waterproof mortar according to claim 1, characterized in that, The crack-resistant fiber is one or more of polyvinyl alcohol fiber, polyacrylic acid fiber, and nylon fiber.

7. The root-resistant and anti-sagging waterproof mortar according to claim 1, characterized in that, The water-reducing agent is a powdered polycarboxylate high-efficiency water-reducing agent.

8. A method for preparing the root-resistant and anti-sagging waterproof mortar according to claim 3, characterized in that, Includes the following steps: Preparation of powdered gelling agent 1; The specific process is as follows: Add 5-8% ethanol by weight of silica sol to silica sol, stir evenly and cool to -5~-10℃, put it into a sealed container, and use vacuum pressure of 90~100KPa to remove volatile components until the solid content is greater than 99.5%. Then, use high frequency pulverization at low temperature of -5~-10℃ to form powder with a particle size of 1~100μm. Preparation of root-resistant and sagging-resistant waterproof mortar; The specific process is as follows: Add No. 3 quartz sand to the mixing tank according to the quartz sand ratio, start the mixer, and slowly add the liquid root inhibitor 3'-chloroacetone benzene while stirring. Stir for 15-25 minutes, then add latex powder, gelling agent 1, gelling agent 2, thixotropic agent, crack-resistant fiber and water-reducing agent according to the ratio, and continue stirring for 20-30 minutes. Finally, add cement, No. 1 quartz sand and No. 2 quartz sand according to the ratio and stir evenly.

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