High-fracture-resistance cement-based capillary crystalline waterproof coating as well as preparation method and application thereof

Abstract

The invention discloses a high-fracture-resistance cement-based permeable crystallization type waterproof coating as well as a preparation method and application thereof. The high-fracture-resistance cement-based permeable crystallization type waterproof coating comprises the following raw materials in percentage by weight: 40-55% of 425 # grey cement; 40%-55% of a filling agent; 2%-4% of redispersible latex powder; 0.2%-0.6% of cellulose ether; 0.5%-1.5% of an active material; 0.1%-0.3% of calcium formate; wherein the filling agent is one of ground calcium carbonate, fly ash and talcum powder; according to the high-fracture-resistance cement-based permeable crystallization type waterproof coating, quartz sand in an existing cement-based permeable crystallization type waterproof coating is replaced with one of the ground calcium carbonate, the coal ash and the talcum powder, so that cavitation structures generated in the hydration process of the cement-based permeable crystallization type waterproof coating can be effectively reduced; and the structural uniformity of the waterproof coating is improved, so that the breaking strength of the waterproof coating is improved, the purposes of low cost and high breaking strength are achieved, and the waterproof coating has important application value in waterproofing of building structures in a relatively strong deformation environment.

Description

Technical Field

[0001] The invention belongs to building materials, and in particular relates to a high-flexural-resistance cement-based penetrating crystalline waterproof coating and a preparation method and application thereof. Background Art

[0002] Cement-based penetrating crystalline waterproof material is a rigid waterproof material used in cement concrete. After it reacts with water, the active chemical substances contained in the material penetrate into the concrete with water as the carrier, and form water-insoluble needle-shaped crystals with cement hydration products, filling capillary channels and tiny gaps, thereby improving the compactness and waterproofness of concrete. Cement-based penetrating crystalline waterproof materials are divided into cement-based penetrating crystalline waterproof coatings and cement-based penetrating crystalline waterproof agents according to their usage.

[0003] Cement-based penetrating crystalline waterproof coatings are usually made of silicate cement and quartz sand as the main ingredients, with a certain amount of active chemical substances added to make powdered materials. After mixing with water, they are mixed into slurries that can be brushed or sprayed on the surface of cement concrete; they can also be dry-spread and pressed into the surface of cement concrete that has not been completely solidified; cement-based penetrating crystalline waterproof coatings have the characteristics and properties of multiple anti-seepage, self-repairing, and breathable and impermeable, and have extremely strong compressive resistance. The waterproof layer and the concrete surface form a complete system and will not separate. Compared with flexible organic waterproof coatings, cement-based penetrating crystalline waterproof coatings have unique properties and are widely used; however, the waterproof coating of cement-based penetrating crystalline waterproof coatings used in bridges, tunnels, and buildings in earthquake-prone areas often fails due to cracks in the base layer. This is because the existing cement-based penetrating crystalline waterproof coatings lack flexibility and have no extension effect. When deformation stress occurs in the base layer, the waterproof coating is easy to break and lose its waterproof effect.

[0004] In order to better meet the requirements for concrete waterproofing of building structures in strong deformation environments such as bridges, tunnels, and earthquake-prone areas, how to improve the flexural properties of cement-based penetrating crystalline waterproof coatings is a difficult problem that needs to be solved urgently. Summary of the invention

[0005] In order to solve the above technical problems, the purpose of the present invention is to provide a high-flexural-resistance cement-based penetrating crystalline waterproof coating and a preparation method and application thereof, which can effectively improve the flexural resistance of the obtained cement-based penetrating crystalline waterproof coating. The prepared cement-based penetrating crystalline waterproof coating has important application value in the waterproofing of building structures in strong deformation environments such as bridges, tunnels, and buildings in earthquake-prone areas.

[0006] To achieve the above object, the present invention adopts the following technical solutions:

[0007] The first aspect of the present invention is to provide a high-flexural-resistance cement-based permeable crystalline waterproof coating, the raw material composition and weight percentage ratio of which are:

[0008]

[0009] Wherein, the filler is one of heavy calcium, fly ash and talcum powder.

[0010] Preferably, the filler is heavy calcium.

[0011] Using heavy calcium as a filler can better improve the flexural strength and waterproof performance of cement-based penetrating crystalline waterproof coatings.

[0012] Furthermore, the mesh size of the heavy calcium is 325 mesh to 800 mesh.

[0013] Using heavy calcium carbonate with a mesh size of 325 to 800 mesh as a filler can more evenly fill the waterproof coating during the cement hydration process, reduce voids and defects, improve the density and uniformity of the waterproof coating, and thus improve the strength, hardness and toughness of the waterproof coating.

[0014] Preferably, the mesh size of the heavy calcium is 500 mesh.

[0015] The present invention finds that the fineness of heavy calcium carbonate with a mesh size of 500-800 mesh has little effect on the flexural strength of the cement-based penetrating crystalline waterproof coating. Generally, the higher the fineness of the heavy calcium carbonate, the higher the price. Therefore, selecting 500-mesh heavy calcium carbonate as a filler can take into account both the high flexural strength and low cost of the cement-based penetrating crystalline waterproof coating.

[0016] Furthermore, the active material is one of sodium silicate and sodium methyl silicate.

[0017] Preferably, the active material is sodium methyl silicate.

[0018] The use of sodium methyl silicate as the active material can better improve the flexural strength, anti-penetration and moisture-proof properties of cement-based penetrating crystalline waterproof coatings, while making the waterproof coatings more workable and stable.

[0019] Preferably, the weight percentage of the redispersible latex powder is 2% to 3.3%.

[0020] The present invention finds that for the high flexural resistance cement-based penetrating crystalline waterproof coating made from the raw materials of the present invention, after the addition amount of redispersible latex powder reaches 3.3%, continuing to add redispersible latex powder has little effect on its flexural strength, but the cost will continue to increase. Therefore, the addition amount of 3.3% of redispersible latex powder can take into account both the high flexural resistance and low cost of the cement-based penetrating crystalline waterproof coating.

[0021] Preferably, the raw material composition and weight percentage ratio of the above-mentioned high flexural resistance cement-based penetrating crystalline waterproof coating are:

[0022]

[0023] The present invention finds that the use of such a ratio enables the cement-based penetrating crystallization waterproof coating to have high flexural strength and relatively high compressive strength, bonding strength and anti-seepage performance, while taking into account the low cost of the waterproof coating.

[0024] The second aspect of the present invention is to provide a method for preparing a high-flexural-resistance cement-based permeable crystalline waterproof coating, comprising the following steps:

[0025] Put 425# gray cement, filler, redispersible latex powder, cellulose ether, active material and calcium formate into a dry powder mixer according to the above raw material ratio, stir at a stirring speed of 1000-1500r / min for 20-30min, and then pack the materials.

[0026] The third aspect of the present invention is to provide an application of a high-flexural-resistance cement-based penetrating crystalline waterproof coating in concrete waterproofing technology, wherein the high-flexural-resistance cement-based penetrating crystalline waterproof coating is the above-mentioned high-flexural-resistance cement-based penetrating crystalline waterproof coating or is prepared by the above-mentioned preparation method of the high-flexural-resistance cement-based penetrating crystalline waterproof coating.

[0027] Compared with the prior art, the present invention has at least the following beneficial effects:

[0028] 1. The high-flexural-resistance cement-based penetrating crystalline waterproof coating provided by the present invention can increase the structural uniformity of the waterproof coating, thereby increasing the flexural strength: the existing cement-based penetrating crystalline waterproof coating uses quartz sand as fine aggregate. When the cement-based penetrating crystalline waterproof coating is added with water and stirred, and is applied to form a waterproof coating, the cement begins to hydrate. Since there are many microscopic gaps on the surface of the quartz sand, these gaps will produce many cavitation structures during the cement hydration reaction, affecting the flexural strength of the waterproof coating; the high-flexural-resistance cement-based penetrating crystalline waterproof coating provided by the present invention can effectively reduce the cavitation structure generated by the cement-based penetrating crystalline waterproof coating during the hydration process by replacing the quartz sand in the existing cement-based penetrating crystalline waterproof coating with one of heavy calcium, fly ash, and talcum powder, thereby increasing the structural uniformity of the waterproof coating and increasing the flexural strength of the waterproof coating.

[0029] 2. The high flexural resistance cement-based penetrating crystalline waterproof coating provided by the present invention achieves the goal of low cost and high flexural strength through a unique formula, that is, high flexural strength can be achieved by using raw materials with lower cost: the existing cement-based penetrating crystalline waterproof coating uses quartz sand as fine aggregate, although it has high compressive strength, but poor flexural strength. In order to improve its flexural strength, a large amount of redispersible latex powder is usually added to enhance the flexural strength of the waterproof coating, resulting in the high cost of the existing cement-based penetrating crystalline waterproof coating; the high flexural resistance cement-based penetrating crystalline waterproof coating provided by the present invention can achieve high flexural strength by replacing the quartz sand in the existing cement-based penetrating crystalline waterproof coating with one of heavy calcium, fly ash, and talcum powder, and adding a small amount of redispersible latex powder, thereby reducing the cost of the high flexural resistance cement-based penetrating crystalline waterproof coating.

[0030] 3. In the waterproofing of building structures in a strong deformation environment, such as bridges, tunnels, and buildings in earthquake-prone areas, these buildings have high requirements on the flexural strength of the concrete waterproof coating, but relatively low requirements on its compressive strength. The high flexural resistance cement-based penetrating crystalline waterproof coating provided by the present invention can achieve higher flexural strength with lower-cost materials, and the compressive strength, bonding strength and impermeability are also higher than the requirements of the national standard (GB 18445-2012 "Cement-based penetrating crystalline waterproof material"), and has important application value in the concrete waterproofing technology of these buildings. DETAILED DESCRIPTION

[0031] The present invention will be further described below by specific examples. It should be understood that these examples are only used to illustrate the present invention and are not intended to limit the scope of the present invention.

[0032] It should be noted that the mixing method of the high-flexural-resistance cement-based penetrating crystalline waterproof coating in the present invention has no effect on the final product performance of the present invention, as long as the various raw materials and dry materials of the present invention can be finally mixed evenly. The stirring parameters of the dry powder mixer commonly used in daily production work are used in the following embodiments; the redispersible latex powder used in the embodiments of the present invention is ethylene-vinyl acetate copolymer, but the redispersible latex powder in the present invention includes but is not limited to ethylene-vinyl acetate copolymer, and can also be vinyl acetate / versatate copolymer, acrylic copolymer, etc.

[0033] Example 1

[0034] This embodiment first provides a high-flexural-resistance cement-based permeable crystalline waterproof coating, the raw material composition and weight percentage ratio of which are:

[0035]

[0036] This embodiment further provides a method for preparing the above-mentioned high-flexural-resistance cement-based permeable crystalline waterproof coating, which is specifically as follows:

[0037] 425# gray cement, 500 mesh heavy calcium, redispersible latex powder, cellulose ether, sodium methyl silicate and calcium formate are put into a dry powder mixer according to the above raw material ratio. After stirring at a stirring speed of 1500r / min for 20 minutes, a high-flexural-resistance cement-based penetrating crystalline waterproof coating of this embodiment is obtained, which is recorded as X1.

[0038] Example 2

[0039] This embodiment first provides a high-flexural-resistance cement-based permeable crystalline waterproof coating, the raw material composition and weight percentage ratio of which are:

[0040]

[0041] This embodiment further provides a method for preparing the above-mentioned high-flexural-resistance cement-based permeable crystalline waterproof coating, which is specifically as follows:

[0042] 425# gray cement, 500 mesh heavy calcium, redispersible latex powder, cellulose ether, sodium methyl silicate and calcium formate are put into a dry powder mixer according to the above raw material ratio. After stirring at a stirring speed of 1500r / min for 20 minutes, a high-flexural-resistance cement-based penetrating crystalline waterproof coating of this embodiment is obtained, which is recorded as X2.

[0043] Example 3

[0044] This embodiment first provides a high-flexural-resistance cement-based permeable crystalline waterproof coating, the raw material composition and weight percentage ratio of which are:

[0045]

[0046] This embodiment further provides a method for preparing the above-mentioned high-flexural-resistance cement-based permeable crystalline waterproof coating, which is specifically as follows:

[0047] 425# gray cement, 500 mesh heavy calcium, redispersible latex powder, cellulose ether, sodium methyl silicate and calcium formate are put into a dry powder mixer according to the above raw material ratio. After stirring at a stirring speed of 1000r / min for 30 minutes, a high-flexural-resistance cement-based penetrating crystalline waterproof coating of this embodiment is obtained, which is recorded as X3.

[0048] Example 4

[0049] This embodiment first provides a high-flexural-resistance cement-based permeable crystalline waterproof coating, the raw material composition and weight percentage ratio of which are:

[0050]

[0051] This embodiment further provides a method for preparing the above-mentioned high-flexural-resistance cement-based permeable crystalline waterproof coating, which is specifically as follows:

[0052] 425# gray cement, 500 mesh heavy calcium, redispersible latex powder, cellulose ether, sodium methyl silicate and calcium formate are put into a dry powder mixer according to the above raw material ratio. After stirring at a stirring speed of 1000r / min for 30 minutes, a high-flexural-resistance cement-based penetrating crystalline waterproof coating of this embodiment is obtained, which is recorded as X4.

[0053] Example 5

[0054] This embodiment first provides a high-flexural-resistance cement-based permeable crystalline waterproof coating, the raw material composition and weight percentage ratio of which are:

[0055]

[0056]

[0057] This embodiment further provides a method for preparing the above-mentioned high-flexural-resistance cement-based permeable crystalline waterproof coating, which is specifically as follows:

[0058] 425# gray cement, 500 mesh heavy calcium, redispersible latex powder, cellulose ether, sodium methyl silicate and calcium formate are put into a dry powder mixer according to the above raw material ratio. After stirring at a stirring speed of 1500r / min for 20 minutes, a high-flexural-resistance cement-based penetrating crystalline waterproof coating of this embodiment is obtained, which is recorded as X5.

[0059] Example 6

[0060] This embodiment first provides a high-flexural-resistance cement-based permeable crystalline waterproof coating, the raw material composition and weight percentage ratio of which are:

[0061]

[0062] This embodiment further provides a method for preparing the above-mentioned high-flexural-resistance cement-based permeable crystalline waterproof coating, which is specifically as follows:

[0063] 425# gray cement, 500 mesh heavy calcium, redispersible latex powder, cellulose ether, sodium methyl silicate and calcium formate are put into a dry powder mixer according to the above raw material ratio. After stirring at a stirring speed of 1000r / min for 30 minutes, a high-flexural-resistance cement-based penetrating crystalline waterproof coating of this embodiment is obtained, which is recorded as X6.

[0064] Example 7

[0065] This embodiment first provides a high-flexural-resistance cement-based permeable crystalline waterproof coating, the raw material composition and weight percentage ratio of which are:

[0066]

[0067]

[0068] This embodiment further provides a method for preparing the above-mentioned high-flexural-resistance cement-based permeable crystalline waterproof coating, which is specifically as follows:

[0069] 425# gray cement, 500 mesh heavy calcium, redispersible latex powder, cellulose ether, sodium methyl silicate and calcium formate are put into a dry powder mixer according to the above raw material ratio. After stirring at a stirring speed of 1000r / min for 30 minutes, the high-flexural-resistance cement-based penetrating crystalline waterproof coating of this embodiment is obtained, which is recorded as X7.

[0070] Example 8

[0071] This embodiment first provides a high-flexural-resistance cement-based permeable crystalline waterproof coating, the raw material composition and weight percentage ratio of which are:

[0072]

[0073] This embodiment further provides a method for preparing the above-mentioned high-flexural-resistance cement-based permeable crystalline waterproof coating, which is specifically as follows:

[0074] 425# gray cement, 500 mesh heavy calcium, redispersible latex powder, cellulose ether, sodium methyl silicate and calcium formate are put into a dry powder mixer according to the above raw material ratio. After stirring at a stirring speed of 1500r / min for 20 minutes, a high-flexural-resistance cement-based penetrating crystalline waterproof coating of this embodiment is obtained, which is recorded as X8.

[0075] Example 9

[0076] This embodiment first provides a high-flexural-resistance cement-based permeable crystalline waterproof coating, the raw material composition and weight percentage ratio of which are:

[0077]

[0078]

[0079] This embodiment further provides a method for preparing the above-mentioned high-flexural-resistance cement-based permeable crystalline waterproof coating, which is specifically as follows:

[0080] 425# gray cement, 500 mesh heavy calcium, redispersible latex powder, cellulose ether, sodium methyl silicate and calcium formate are put into a dry powder mixer according to the above raw material ratio. After stirring at a stirring speed of 1000r / min for 30 minutes, a high-flexural-resistance cement-based penetrating crystalline waterproof coating of this embodiment is obtained, which is recorded as X9.

[0081] Example 10

[0082] This embodiment first provides a high-flexural-resistance cement-based permeable crystalline waterproof coating, the raw material composition and weight percentage ratio of which are:

[0083]

[0084] This embodiment further provides a method for preparing the above-mentioned high-flexural-resistance cement-based permeable crystalline waterproof coating, which is specifically as follows:

[0085] 425# gray cement, 500 mesh heavy calcium, redispersible latex powder, cellulose ether, sodium methyl silicate and calcium formate are put into a dry powder mixer according to the above raw material ratio. After stirring at a stirring speed of 1000r / min for 30 minutes, a high-flexural-resistance cement-based penetrating crystalline waterproof coating of this embodiment is obtained, which is recorded as X10.

[0086] Embodiment 11

[0087] This embodiment first provides a high-flexural-resistance cement-based permeable crystalline waterproof coating, the raw material composition and weight percentage ratio of which are:

[0088]

[0089]

[0090] This embodiment further provides a method for preparing the above-mentioned high-flexural-resistance cement-based permeable crystalline waterproof coating, which is specifically as follows:

[0091] 425# gray cement, 500 mesh heavy calcium, redispersible latex powder, cellulose ether, sodium methyl silicate and calcium formate are put into a dry powder mixer according to the above raw material ratio. After stirring at a stirring speed of 1000r / min for 30 minutes, a high-flexural-resistance cement-based penetrating crystalline waterproof coating of this embodiment is obtained, which is recorded as X11.

[0092] Example 12

[0093] This embodiment first provides a high-flexural-resistance cement-based permeable crystalline waterproof coating, the raw material composition and weight percentage ratio of which are:

[0094]

[0095] This embodiment further provides a method for preparing the above-mentioned high-flexural-resistance cement-based permeable crystalline waterproof coating, which is specifically as follows:

[0096] 425# gray cement, 500 mesh talcum powder, redispersible latex powder, cellulose ether, sodium methyl silicate and calcium formate are put into a dry powder mixer according to the above raw material ratio. After stirring at a stirring speed of 1500r / min for 20 minutes, a high-flexural-resistance cement-based penetrating crystalline waterproof coating of this embodiment is obtained, which is recorded as X12.

[0097] Example 13

[0098] This embodiment first provides a high-flexural-resistance cement-based permeable crystalline waterproof coating, the raw material composition and weight percentage ratio of which are:

[0099]

[0100]

[0101] This embodiment further provides a method for preparing the above-mentioned high-flexural-resistance cement-based permeable crystalline waterproof coating, which is specifically as follows:

[0102] 425# gray cement, 800 mesh fly ash, redispersible latex powder, cellulose ether, sodium methyl silicate and calcium formate are put into a dry powder mixer according to the above raw material ratio. After stirring at a stirring speed of 1500r / min for 20 minutes, a high-flexural-resistance cement-based penetrating crystalline waterproof coating of this embodiment is obtained, which is recorded as X13.

[0103] Embodiment 14

[0104] This embodiment first provides a high-flexural-resistance cement-based permeable crystalline waterproof coating, the raw material composition and weight percentage ratio of which are:

[0105]

[0106] This embodiment further provides a method for preparing the above-mentioned high-flexural-resistance cement-based permeable crystalline waterproof coating, which is specifically as follows:

[0107] 425# gray cement, 325 mesh heavy calcium carbonate, redispersible latex powder, cellulose ether, sodium methyl silicate and calcium formate are put into a dry powder mixer according to the above raw material ratio. After stirring at a stirring speed of 1000r / min for 30 minutes, a high-flexural-resistance cement-based penetrating crystalline waterproof coating of this embodiment is obtained, which is recorded as X14.

[0108] Embodiment 15

[0109] This embodiment first provides a high-flexural-resistance cement-based permeable crystalline waterproof coating, the raw material composition and weight percentage ratio of which are:

[0110]

[0111] This embodiment further provides a method for preparing the above-mentioned high-flexural-resistance cement-based permeable crystalline waterproof coating, which is specifically as follows:

[0112] 425# gray cement, 800 mesh heavy calcium, redispersible latex powder, cellulose ether, sodium methyl silicate and calcium formate are put into a dry powder mixer according to the above raw material ratio. After stirring at a stirring speed of 1000r / min for 30 minutes, the high-flexural-resistance cement-based penetrating crystalline waterproof coating of this embodiment is obtained, which is recorded as X15.

[0113] Example 16

[0114] This embodiment first provides a high-flexural-resistance cement-based permeable crystalline waterproof coating, the raw material composition and weight percentage ratio of which are:

[0115]

[0116] This embodiment further provides a method for preparing the above-mentioned high-flexural-resistance cement-based permeable crystalline waterproof coating, which is specifically as follows:

[0117] 425# gray cement, 500 mesh heavy calcium, redispersible latex powder, cellulose ether, sodium silicate and calcium formate are put into a dry powder mixer according to the above raw material ratio. After stirring at a stirring speed of 1000r / min for 30 minutes, a high-flexural-resistance cement-based penetrating crystalline waterproof coating of this embodiment is obtained, which is recorded as X16.

[0118] Comparative Example 1

[0119] This comparative example provides a waterproof coating, which differs from Example 1 only in that the 500-mesh heavy calcium is replaced with 70-150-mesh quartz sand, denoted as T1.

[0120] Comparative Example 2

[0121] This comparative example provides a waterproof coating, which is different from Example 1 in that no redispersible latex powder is added in this comparative example and the raw material composition and weight percentage ratio of the waterproof coating in this comparative example are:

[0122]

[0123]

[0124] The raw materials of this comparative example are mixed evenly according to the proportion to obtain the waterproof coating of this comparative example, which is recorded as T2.

[0125] Comparative Example 3

[0126] This comparative example provides a waterproof coating, which is different from Example 1 in that cellulose ether is not added in this comparative example and the raw material composition and weight percentage ratio of the waterproof coating in this comparative example are:

[0127]

[0128] The raw materials of this comparative example are mixed evenly according to the proportion to obtain the waterproof coating of this comparative example, which is recorded as T3.

[0129] Comparative Example 4

[0130] This comparative example provides a waterproof coating, which is different from Example 1 in that sodium methyl silicate is not added in this comparative example and the raw material composition and weight percentage ratio of the waterproof coating in this comparative example are:

[0131]

[0132] The raw materials of this comparative example are mixed evenly according to the proportion to obtain the waterproof coating of this comparative example, which is recorded as T4.

[0133] Comparative Example 5

[0134] This comparative example provides a waterproof coating, which is different from Example 1 in that calcium formate is not added in this comparative example and the raw material composition and weight percentage ratio of the waterproof coating in this comparative example are:

[0135]

[0136] The raw materials of this comparative example are mixed evenly according to the ratio to obtain the waterproof coating of this comparative example, which is recorded as T5.

[0137] Comparative Example 6

[0138] This comparative example provides a waterproof coating, which differs from Example 5 only in that the 500-mesh heavy calcium is replaced with 70-150-mesh quartz sand, denoted as T6.

[0139] Comparative Example 7

[0140] Take the existing cement-based penetrating crystalline waterproof coating on the market and record it as T7.

[0141] The flexural strength, compressive strength, wet base surface bonding strength and impermeability of X1 to X16 in each embodiment and T1 to T7 in the comparative example were tested, and the test method was based on GB 18445-2012 "Cement-based penetrating crystalline waterproof material"; the test results are shown in Table 1.

[0142] Table 1. Test results of waterproof coatings in various embodiments and comparative examples

[0143]

[0144] It can be seen from the data in Table 1 that under the same detection method, the flexural strength of the high flexural resistance cement-based penetrating crystalline waterproof coating of the present invention is significantly better than that of T7 (similar products on the market), and its compressive strength, wet base surface bonding strength and impermeability are also higher than the requirements of the national standard (GB 18445-2012 "Cement-based penetrating crystalline waterproof material"), indicating that the high flexural resistance cement-based penetrating crystalline waterproof coating provided by the present invention can achieve higher flexural strength by replacing quartz sand with one of heavy calcium, fly ash, and talcum powder, and adding a small amount of redispersible latex powder, thereby reducing the cost of the high flexural resistance cement-based penetrating crystalline waterproof coating; by comparing the performance parameters of X1, X4 and X5, it can be seen that the flexural resistance of the high flexural resistance cement-based penetrating crystalline waterproof coating increases with the increase in the amount of redispersible latex powder added, but compared with X1, the amount of redispersible latex powder added in X5 is increased by 0.7%, and the flexural resistance is only improved by 0.1MPa. And the compressive strength is reduced. Due to the high price of redispersible latex powder, considering the cost of waterproof coatings, X1 can have extremely high flexural strength and compressive strength at a lower cost. Therefore, the ratio of high flexural resistance cement-based penetrating crystalline waterproof coating in Example 1 is the best ratio (taking into account both high flexural resistance and low cost); comparing the performance parameters of X1 and T1, and comparing the performance parameters of X5 and T6, the flexural strength of X1 is much higher than that of T1, and the flexural strength of X5 is much higher than that of T6. It can be seen that replacing the quartz sand in the cement-based penetrating crystalline waterproof coating with heavy calcium can effectively increase the flexural strength of the waterproof coating; comparing the performance parameters of X1 and T6, T The amount of redispersible latex powder added in Example 6 is higher than that in Example 1, but its flexural strength is still much lower than that in Example 1, which further shows that the high flexural strength cement-based penetrating crystalline waterproof coating provided by the present invention achieves the goal of low cost and high flexural strength through a unique formula (adding a small amount of redispersible latex powder can achieve a higher flexural strength); comparing X1, X14 and X15, the difference between the three is only the fineness of heavy calcium, but the flexural strength of X1 is slightly higher than that of X14 and X15, which can further show that the ratio of the high flexural strength cement-based penetrating crystalline waterproof coating in Example 1 is the best ratio; comparing the performance parameters of X1 and X16, the difference between the two is only the active material difference, X The active material in X1 is sodium methyl silicate, and the active material in X16 is sodium silicate. The flexural strength of X1 is slightly higher than that of X16, and the anti-permeability performance of X1 is higher than that of X16, indicating that the use of sodium methyl silicate as the active material can better improve the flexural strength, anti-permeability and moisture-proof performance of the cement-based penetrating crystalline waterproof coating than sodium silicate. By comparing the performance parameters of X1 and T1 to T5, it can be seen that the components of the high-flexural-resistance cement-based penetrating crystalline waterproof coating of the present invention are indispensable, and the synergistic effect of the components can make the cement-based penetrating crystalline waterproof coating achieve the goal of low cost and high flexural strength, and the flexural strength of X1 reaches 8.1MPa, which is 2.89 times, making the high-flexural cement-based permeable crystalline waterproof coating of the present invention have important application value in the waterproof technology of building structures in a strong deformation environment.

[0145] The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with the technology to understand the content of the present invention and implement it accordingly, and they cannot be used to limit the protection scope of the present invention. Any equivalent transformation or modification made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. A high-flexural-resistance cement-based penetrating crystalline waterproof coating, characterized in that: The raw material composition and weight percentage ratio are as follows: Wherein, the filler is one of heavy calcium, fly ash and talcum powder.

2. The high-flexural-resistance cement-based penetrating crystalline waterproof coating according to claim 1, characterized in that: The filler is heavy calcium.

3. The high flexural resistance cement-based penetrating crystalline waterproof coating according to claim 2, characterized in that ,, the mesh number of the heavy calcium is 325 mesh to 800 mesh.

4. The high-flexural-resistance cement-based penetrating crystalline waterproof coating according to claim 3, characterized in that: The mesh number of the heavy calcium is 500 meshes.

5. The high-flexural-resistance cement-based penetrating crystalline waterproof coating according to claim 1, characterized in that: The active material is one of sodium silicate and sodium methyl silicate.

6. The high-flexural-resistance cement-based penetrating crystalline waterproof coating according to claim 5, characterized in that: The active material is sodium methyl silicate.

7. The high-flexural-resistance cement-based penetrating crystalline waterproof coating according to claim 1, characterized in that: The weight percentage of the redispersible latex powder is 2% to 3.3%.

8. The high-flexural-resistance cement-based penetrating crystalline waterproof coating according to claim 1, characterized in that: The raw material composition and weight percentage ratio are:

9. A method for preparing a high-flexural-resistance cement-based permeable crystalline waterproof coating, comprising the following steps: Put 425# gray cement, filler, redispersible latex powder, cellulose ether, active material and calcium formate into a dry powder mixer according to the raw material ratio of the high-flexural-resistance cement-based penetrating crystalline waterproof coating according to any one of claims 1-8, mix evenly, and then pack.

10. Application of a high-flexural-resistance cement-based penetrating crystalline waterproof coating in concrete waterproofing technology, wherein the high-flexural-resistance cement-based penetrating crystalline waterproof coating is the high-flexural-resistance cement-based penetrating crystalline waterproof coating described in any one of claims 1 to 8 or is prepared by the preparation method described in claim 9.

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