A modified cement-based grouting material and its application

Abstract

The present invention discloses a modified cement-based grouting material, comprising a first component and a second component, wherein the first component is a cement system mixture, and the second component is a modified polymer emulsion obtained by modifying a polymer emulsion with a petroleum resin emulsion; the second component comprises a petroleum resin emulsion and a polymer emulsion; the mass ratio of the petroleum resin emulsion to the polymer emulsion in the second component is 1:2.5-3.2; the cement system mixture comprises an inorganic filler composed of sodium metaaluminate, sodium carbonate and calcium oxide. The grouting material suitable for plain concrete in the present invention, through the modified polymer emulsion of the second component, gives the cement-based grouting material the characteristics of flexibility and high elasticity, compensates for the microcracks generated by the cement gel, and fills the pores inside the cement, thereby modifying the cement system, making the cement system have good flexibility and elasticity, so that the condensate of the grouting material can adapt to the deformation of the structure, and has better sealing, water blocking and durability.

Description

[0001] This application is a divisional application of the invention patent application with application date of December 31, 2020, application number 2020116355907, and invention name "Grouting materials, preparation methods and applications thereof". Technical Field

[0002] The invention relates to the technical field of building waterproofing and grouting materials, and in particular to a flexible and highly elastic modified cement-based grouting material and application of the grouting material in building waterproofing. Background Art

[0003] There are often many gaps under the balcony tiles or roof surface. For example, there is a 3-5 cm dry sand layer under the balcony tiles and an insulation layer under the roof surface. The insulation materials are often porous materials. Once water penetrates into these gaps, it will form a source of water leakage. Coupled with problems such as failure of the waterproof layer or structural cracks, the water source will often reach the room along the leakage channel, causing trouble to everyone's life.

[0004] There are two main methods for dealing with this type of leakage problem. One method is to remove all the surface layers of the building surface to the structural layer and then rebuild the waterproof layer. This method is time-consuming, labor-intensive and costly. The other method is to use machine pressure to inject materials with a certain fluidity into the gaps under the surface layer. After a certain period of time, these fluid materials will gradually condense into elastomers, blocking all leakage channels and squeezing out the water in the gaps. This is equivalent to reshaping a waterproof layer above the structural layer, which is also called "rebuilding the waterproof layer method" in the industry.

[0005] At present, the grouting materials used in the reconstruction of waterproof layer on the market mainly include cement-based grouting materials and acrylate grouting materials. Traditional cement-based grouting materials occupy most of the grouting material market due to their low cost, wide range of raw materials, simple operation and convenient construction; but at the same time, traditional cement-based grouting materials are rigid materials, easy to crack, and cannot adapt to the deformation of the base layer; while acrylate grouting materials have low solid content and are easy to lose water and shrink in a dry environment, re-forming leakage channels.

[0006] If the goal of repairing the balcony or roof without removing bricks or damaging it after a leak occurs is to be achieved, then a flexible, highly elastic modified cement-based grouting material is needed so that the condensate of the grouting material can adapt to the deformation of the structure and have better sealing, water blocking and durability. Summary of the invention

[0007] In view of this, in order to overcome the defects of the prior art, the purpose of the present invention is to provide an improved grouting material and the application of the grouting material, which has good water resistance and shrinkage resistance as well as excellent flexibility and high elasticity.

[0008] In order to achieve the above object, the present invention adopts the following technical solutions:

[0009] A grouting material includes a first component and a second component, wherein the mass ratio of the first component to the second component is 1.6:1 to 2.8:1; the first component is a cement system mixture, and the second component includes a petroleum resin emulsion and a polymer emulsion. In some embodiments of the present invention, the mass ratio of the first component to the second component is preferably 1.9:1. The cement system mixture is similar to a traditional cement-based composition.

[0010] The second component in the present invention is a modified polymer emulsion obtained by modifying a polymer emulsion with a petroleum resin emulsion. The modified polymer emulsion can compensate for microcracks generated by cement gel and fill the pores inside the cement, thereby modifying the cement system to give the cement system good flexibility and elasticity, so that the condensate of the grouting material can adapt to the deformation of the structure and have better sealing, water blocking and durability.

[0011] According to some preferred implementation aspects of the present invention, the mass ratio of the petroleum resin emulsion to the polymer emulsion in the second component is 1:2.5 to 1:3.2. In some embodiments of the present invention, the mass ratio of the petroleum resin emulsion to the polymer emulsion is preferably 1:3.

[0012] According to some preferred embodiments of the present invention, the second component comprises the following raw material ingredients, measured in parts by weight: 8 to 20 parts of petroleum resin emulsion and 25 to 50 parts of polymer emulsion.

[0013] According to some preferred embodiments of the present invention, the petroleum resin emulsion is one of C5 petroleum resin emulsion, C9 petroleum resin emulsion, C5 petroleum resin and C9 petroleum resin copolymer emulsion or DCPD petroleum resin emulsion; preferably DCPD petroleum resin emulsion. Petroleum resin is a by-product of catalytic cracking of petroleum. It is polymerized or copolymerized at an appropriate temperature by utilizing the unsaturated groups in the cracking raw materials under the action of a catalyst. The molecular weight of the petroleum resin used in the present invention is less than 2000, and it is mainly used for the modification of polymer emulsions to improve the compatibility of polymer emulsions with cement systems. DCPD petroleum resin emulsion contains highly reactive double bonds and has good compatibility with other resins or polymer emulsions. It can modify polymer emulsions, significantly improve their working performance, improve the compatibility of polymer emulsions with cement systems, stabilize the cement system, and avoid stratification.

[0014] According to some preferred embodiments of the present invention, the polymer emulsion is one, two or a combination of chloroprene latex, acrylic emulsion, styrene-acrylic emulsion and styrene-butadiene emulsion; preferably chloroprene latex. Chloroprene latex is polymerized by chloroprene in emulsion, which can compensate for microcracks generated by cement gel, give elasticity to the cement system, and fill the pores inside the cement, strengthen the structure, reduce shrinkage, and improve its mechanical properties and weather resistance.

[0015] According to some preferred embodiments of the present invention, the first component includes the following raw material ingredients, measured by weight: 35-55 parts of Portland cement, 0.3-0.6 parts of inorganic filler, 0.01-0.05 parts of retarder, 0.15-0.25 parts of water reducer, 0.01-7 parts of mineral admixture, and 22-47 parts of water.

[0016] According to some preferred implementation aspects of the present invention, the raw materials in the first component are specifically as follows:

[0017] The silicate cement is ordinary silicate cement with a strength coefficient of about 42.5 MPa. Its main function is to serve as a base material for grouting and plugging materials, and to provide the required strength for the grouting and plugging materials.

[0018] The inorganic filler is one, two or a combination of sodium aluminate, sodium carbonate and calcium oxide. The preferred mass ratio is sodium carbonate: sodium aluminate: calcium oxide = 1:1:0.5. The main function of the inorganic filler is to promote the hydration reaction of cement and inhibit the conversion of silica gel in cement into precipitation, thereby accelerating coagulation, enhancing the fluidity of cement slurry and improving the strength of the cement system. Cement undergoes hydration reaction, and the hydration product calcium hydroxide reacts with sodium carbonate in the mineral admixture to form calcium carbonate precipitation that is insoluble in water. At this time, the sodium ion and hydroxide ion content in the cement increases significantly, so that the pH value of the cement remains stable or even further increases. Properly increasing the pH value of the cement can accelerate the hydration rate of the cement and increase its strength. The added sodium aluminate can react with the gypsum in the cement in the alkaline medium formed by the cement hydration to form sodium sulfate, causing the gypsum to lose its original retarding effect, thereby causing the calcium aluminate mineral to hydrate rapidly and precipitate its hydration product crystals, thereby accelerating the coagulation of the cement and improving the strength of the cement system. The added calcium oxide can generate calcium hydroxide during the hydration process of the cement, while slightly increasing the pH value of the cement system, it can also promote the effects of sodium carbonate and sodium aluminate in the added inorganic filler. That is, the inorganic fillers of sodium aluminate, sodium carbonate, and calcium oxide can also play a synergistic role with each other.

[0019] The retarder is one of citric acid, boric acid or tartaric acid, preferably citric acid. The main function of the retarder is to adjust the gel time of the modified cement-based grouting material by controlling the dosage of the added retarder to adapt to the construction needs under different circumstances. The hydroxyl contained in the molecular structure of citric acid can generate an unstable complex with free calcium in the alkaline medium of the cement hydration product, and control the concentration of calcium in the liquid phase in the early stage of the hydration process to produce a retarding effect. As the hydration process proceeds, this unstable complex will decompose on its own, allowing the hydration reaction of the cement to continue, without affecting the later hydration of the cement. Secondly, the hydroxyl, amino and carboxyl groups carried in the citric acid and molecular structure are all easily combined with water molecules through hydrogen bonds, and the hydrogen bonds between the water molecules are combined to form a stable solvated water film on the surface of the cement particles, thereby preventing direct contact between the cement particles, reducing the heat release rate of hydration heat, delaying the cement hydration reaction, and extending the coagulation and hardening time of the cement system, thereby adjusting the gel time of the modified cement-based grouting material.

[0020] The water reducer is one of a polycarboxylate water reducer, a naphthalene water reducer or a lignin water reducer, preferably a polycarboxylate water reducer. The main function of the water reducer is to disperse cement particles, improve the working performance of the cement system, improve the fluidity of the cement system, and reduce the shrinkage of the cement system. After the water reducer is added, the water reducer molecules can be directional adsorbed on the surface of the cement particles, so that the surface of the cement particles carries the same charge (usually negative charge), forming an electrostatic repulsion effect, which promotes the mutual dispersion of cement particles, so that the flocculation structure formed by the mutual association of cement particles due to the different charges on the surface of the cement particles is disintegrated, and the encapsulated part of the water is released to participate in the flow, thereby effectively improving the fluidity of the cement system; at the same time, since the hydrophilic group in the water reducer molecule is very polar, the water reducer adsorption film attached to the surface of the cement particles can form a stable solvated water film with water molecules, and this water film has a good lubricating effect, which can effectively reduce the sliding resistance between the cement particles, thereby further improving the fluidity of the cement system.

[0021] The mineral admixture is fly ash, preferably Class C first-grade fly ash, with a fineness of no more than 12%. It can react chemically with calcium hydroxide or other alkaline earth metal hydroxides in cement to generate hydraulic gelling substances, thereby improving the strength and durability of the cement system; at the same time, it can reduce the friction between cement particles, improve its working performance, and enhance the fluidity of cement paste. The added fly ash can undergo hydration reaction, consume a large amount of calcium hydroxide, generate silica gel and stable fibrous calcium sulfoaluminate crystals, the gel has greater toughness than the crystal, and the calcium sulfoaluminate crystals have better tensile properties than calcium hydroxide crystals, and the hydration products are cross-linked on the surface of the fly ash glass microspheres, thereby improving the strength of the cement system.

[0022] The water is deionized water, and its resistivity is greater than or equal to 10 megohm·cm.

[0023] According to some preferred embodiments of the present invention, the first component also includes 0.25 to 0.75 parts of a fungicide, which is isothiazolinone and / or an isothiazolinone derivative, preferably an isothiazolinone derivative. Isothiazolinone is a highly effective, low-toxic, and environmentally friendly paint preservative. Since the product raw materials contain moisture and nutrients, they are easily infected by bacteria, which can cause the viscosity of the grouting material to decrease, corruption, and other harmful physical and chemical changes.

[0024] The present invention also provides a method for preparing the grouting material as described above, comprising the following steps:

[0025] (1) Preparation of the first component: Weigh each component according to the formula ratio, mix the silicate cement, inorganic filler, mineral admixture, water reducer and retarder evenly, then add water and stir thoroughly to obtain the first component. The addition ratio of the retarder in the first component can be appropriately adjusted to adjust the gel time of the grouting material to meet the requirements of construction operability in different situations.

[0026] (2) Preparation of the second component: Weigh each component according to the formula ratio, mix the petroleum resin emulsion and the polymer emulsion, and stir evenly to obtain the second component.

[0027] The present invention also provides an application of the grouting material as described above in building waterproofing. The modified cement-based grouting material of the present application is used in the construction of building waterproofing and anti-leakage, specifically including the following steps: firstly, pre-treat the base surface of the building roof to remove oil stains or other debris on the surface of the base surface, keep the surface dry, then drill holes and insert needles on the base surface, inject the grouting material into the building base surface with a double-liquid grouting machine, and keep it dry for 2 days or more.

[0028] Compared with the prior art, the advantages of the present invention are as follows: the grouting material suitable for plain concrete in the present invention, through the modified polymer emulsion of the second component, gives the cement-based grouting material the characteristics of flexibility and high elasticity, compensates for the microcracks produced by the cement gel, and fills the pores inside the cement, thereby modifying the cement system so that the cement system has good flexibility and elasticity, so that the condensate of the grouting material can adapt to the deformation of the structure and have better sealing, water blocking and durability. DETAILED DESCRIPTION

[0029] In order to enable those skilled in the art to better understand the technical solution of the present invention, the technical solution in the embodiments of the present invention is clearly and completely described below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0030] The raw materials used in the following examples are as follows:

[0031] Cement: Ordinary Portland Cement (Southern Cement Co., Ltd., P.O42.5)

[0032] Inorganic filler: sodium carbonate (Jiangsu Minglin Chemical Technology Co., Ltd., analytical grade)

[0033] Sodium aluminate (Changzhou Wanlang Chemical Technology Co., Ltd., analytical grade)

[0034] Calcium oxide (Jiangsu Minglin Chemical Technology Co., Ltd., analytical grade)

[0035] Retarder: Citric acid (Suzhou Tenghao Chemical Technology Co., Ltd.)

[0036] Water reducing agent: polycarboxylic acid high performance water reducing agent (Jiangsu Subote New Materials Co., Ltd., model: PCA-1)

[0037] Mineral admixture: fly ash (Changxing Huafei Chemical Co., Ltd.)

[0038] Bactericide: isothiazolinone derivative (Jiangsu Guangcheng Chemical Co., Ltd., model: GF)

[0039] Petroleum resin emulsion: DCPD petroleum resin emulsion (Jiangsu Nanyang Chemical Co., Ltd.)

[0040] Polymer emulsion: Chloroprene latex (Jiangsu Nanyang Chemical Co., Ltd.)

[0041] Example 1

[0042] The composition of the flexible high-elastic cement-based grouting material of this embodiment is as follows:

[0043] The first component (parts by weight): 35 parts of ordinary Portland cement, 0.16 parts of sodium carbonate, 0.16 parts of sodium aluminate, 0.08 parts of calcium oxide, 0.15 parts of polycarboxylate water reducer, 3.5 parts of fly ash, 0.25 parts of fungicide, 0.01 parts of citric acid, and 30 parts of deionized water.

[0044] The second component (parts by weight): 9 parts of DCPD petroleum resin emulsion, 27 parts of chloroprene rubber latex.

[0045] The preparation method of the flexible high-elastic cement-based grouting material of this embodiment is as follows:

[0046] Preparation of the first component: Weigh the components according to the above formula ratio, add ordinary Portland cement, sodium carbonate, sodium aluminate, calcium oxide, polycarboxylate water reducer, fly ash, fungicide and citric acid into a stirring tank, pre-stir to make them fully mixed, then add deionized water into the stirring tank, stir until it is uniform, and obtain the first component.

[0047] Preparation of the second component: Mix the petroleum resin emulsion and the polymer emulsion, and stir them thoroughly until they are uniform to obtain the second component.

[0048] Example 2

[0049] The composition of the flexible high-elastic cement-based grouting material of this embodiment is as follows:

[0050] The first component (parts by weight): 35 parts of ordinary Portland cement, 0.16 parts of sodium carbonate, 0.16 parts of sodium aluminate, 0.08 parts of calcium oxide, 0.15 parts of polycarboxylate water reducer, 3.5 parts of fly ash, 0.25 parts of fungicide, 0.01 parts of citric acid, and 30 parts of deionized water.

[0051] The second component (parts by weight): 9.5 parts of DCPD petroleum resin emulsion, 30 parts of chloroprene rubber latex.

[0052] The preparation method of the flexible high-elastic cement-based grouting material of this embodiment is as follows:

[0053] Preparation of the first component: Weigh the components according to the above formula ratio, add ordinary Portland cement, sodium carbonate, sodium aluminate, calcium oxide, polycarboxylate water reducer, fly ash, fungicide and citric acid into a stirring tank, pre-stir to make them fully mixed, then add deionized water into the stirring tank, stir until it is uniform, and obtain the first component.

[0054] Preparation of the second component: Mix the petroleum resin emulsion and the modified polymer emulsion, and stir them thoroughly until they are uniform to obtain the second component.

[0055] Example 3

[0056] The composition of the flexible high-elastic cement-based grouting material of this embodiment is as follows:

[0057] The first component (parts by weight): 42 parts of ordinary Portland cement, 0.2 parts of sodium carbonate, 0.2 parts of sodium aluminate, 0.1 parts of calcium oxide, 0.18 parts of polycarboxylic acid water reducer, 3.8 parts of fly ash, 0.27 parts of fungicide, 0.01 parts of citric acid, and 36 parts of deionized water.

[0058] The second component (parts by weight): 12 parts of DCPD petroleum resin emulsion, 30.5 parts of chloroprene rubber latex.

[0059] The preparation method of the flexible high-elastic cement-based grouting material of this embodiment is as follows:

[0060] Preparation of the first component: Weigh the components according to the above formula ratio, add ordinary Portland cement, sodium carbonate, sodium aluminate, calcium oxide, polycarboxylate water reducer, fly ash, fungicide and citric acid into a stirring tank, pre-stir to make them fully mixed, then add deionized water into the stirring tank, stir until it is uniform, and obtain the first component.

[0061] Preparation of the second component: Mix the petroleum resin emulsion and the modified polymer emulsion, and stir them thoroughly until they are uniform to obtain the second component.

[0062] Example 4

[0063] The composition of the flexible high-elastic cement-based grouting material of this embodiment is as follows:

[0064] The first component (parts by weight): 48 parts of ordinary Portland cement, 0.25 parts of sodium carbonate, 0.25 parts of sodium aluminate, 0.12 parts of calcium oxide, 0.2 parts of polycarboxylate water reducer, 4.1 parts of fly ash, 0.29 parts of fungicide, 0.01 parts of citric acid, and 38 parts of deionized water.

[0065] The second component (parts by weight): 10 parts of DCPD petroleum resin, 28 parts of chloroprene rubber latex.

[0066] The preparation method of the flexible high-elastic cement-based grouting material of this embodiment is as follows:

[0067] Preparation of the first component: Weigh the components according to the above formula ratio, add ordinary Portland cement, sodium carbonate, sodium aluminate, calcium oxide, polycarboxylate water reducer, fly ash, fungicide and citric acid into a stirring tank, pre-stir to make them fully mixed, then add deionized water into the stirring tank, stir until it is uniform, and obtain the first component.

[0068] Preparation of the second component: Mix the petroleum resin emulsion and the modified polymer emulsion, and stir them thoroughly until they are uniform to obtain the second component.

[0069] Example 5

[0070] The composition of the flexible high-elastic cement-based grouting material of this embodiment is as follows:

[0071] The first component (parts by weight): 35 parts of ordinary Portland cement, 0.16 parts of sodium carbonate, 0.16 parts of sodium aluminate, 0.08 parts of calcium oxide, 0.15 parts of polycarboxylate water reducer, 3.5 parts of fly ash, 0.25 parts of fungicide, 0.05 parts of citric acid, and 30 parts of deionized water.

[0072] The second component: 9 parts of DCPD petroleum resin emulsion and 27 parts of chloroprene rubber latex.

[0073] The preparation method of the flexible high-elastic cement-based grouting material of this embodiment is as follows:

[0074] Preparation of the first component: Weigh the components according to the above formula ratio, add ordinary Portland cement, sodium carbonate, sodium aluminate, calcium oxide, polycarboxylate water reducer, fly ash, fungicide and citric acid into a stirring tank, pre-stir to make them fully mixed, then add deionized water into the stirring tank, stir until it is uniform, and obtain the first component.

[0075] Preparation of the second component: Mix the petroleum resin emulsion and the modified polymer emulsion, and stir them thoroughly until they are uniform to obtain the second component.

[0076] Comparative Example 1

[0077] The grouting material of this comparative example is the traditional cement-based grouting material, and the Ningde Xinjiangong brand inorganic leak-proof grouting material is adopted.

[0078] Comparative Example 2

[0079] The composition and preparation method of the cement-based grouting material of this comparative example are basically the same as those of Example 2, except that the second component in the cement-based grouting material of this comparative example is 26 parts (by weight) of DCPD petroleum resin emulsion.

[0080] Comparative Example 3

[0081] The composition and preparation method of the cement-based grouting material of this comparative example are basically the same as those of Example 2, except that the second component in the cement-based grouting material of this comparative example is 27 parts (by weight) of chloroprene rubber latex.

[0082] Example 6

[0083] When the grouting materials in Examples 1-5 are used for building waterproof and anti-leakage construction, the applied building roof base surface is first pretreated, and the specific steps of the pretreatment are: remove the oil stains or other debris on the surface of the roof base surface, and keep the surface dry. Then, a hole is drilled on the building base surface with a depth of about 3-5 cm, and a special water stop needle for grouting is inserted. The grouting material product packaging is opened, and the first component and the second component of the grouting material are divided into two clean barrels, and the two suction pipes of the double-liquid grouting machine are placed in the two barrels respectively, and then the grouting machine butter head is connected with the water stop needle, and the grouting machine is started to inject the grouting material into the building base, and the grouting machine is closed. After the slurry in the butter head of the grouting machine is completely injected into the water stop needle, the butter head is pulled out, and so on. After the injected slurry reaches the initial setting time, that is, the surface is solidified and does not flow, the water stop needle is pulled out, the grouting hole is sealed, and it is kept dry and cured for 2 days or more.

[0084] The specific gel time can be adjusted by adding the amount of retarder, and the construction time can be adjusted within 8-40 minutes. A gel test can be carried out before grouting. According to the actual conditions of the site, temperature and other projects, the required gel time and the amount of retarder to be added can be confirmed, and then the grouting operation can be carried out.

[0085] Tests and Results

[0086] The flexible high-elastic cement-based grouting materials prepared in Examples 1-5 and the grouting materials in Comparative Examples 1-3 were subjected to various performance tests for waterproofing, plugging and reinforcement, as follows:

[0087] 1. Viscosity test

[0088] Under standard test conditions, weigh an appropriate amount of the mixed grouting material to be tested in each embodiment, and test and record according to the rotational viscometer method in GB / T 10247.

[0089] 2. Compressive strength

[0090] Weigh an appropriate amount of the mixed grouting material to be tested in each embodiment, pour it into a 70mm*70mm*70mm test mold for curing, take out the cured grouting material and put it into a mortar press, gradually pressurize it until the specimen is destroyed, and record the compressive strength.

[0091] 3. Consolidation strength

[0092] Weigh an appropriate amount of the mixed grouting material to be tested in each embodiment, pour it into a 70mm*70mm*70mm test mold filled with sand and gravel to solidify, take out the solidified grouting material and put it into a mortar press, gradually pressurize it until the specimen is destroyed, and record the consolidation strength.

[0093] 4. Elongation at break

[0094] The test pieces of each embodiment were tested according to GB / T 16777-2008, with a tensile speed of 200 mm / min, until they were tensile to fracture, and the average value was taken and recorded.

[0095] 5. Waterproof

[0096] The test pieces of each embodiment were tested using a water-tightness tester. The water injection valve was opened to maintain a constant pressure of 0.2 KPa for 30 minutes. Whether each test piece was water-permeable was observed and recorded.

[0097] 6. Acid and alkali resistance

[0098] The test pieces of each embodiment were immersed in 10% sodium hydroxide and 1% hydrochloric acid solution for 72 hours, taken out, and the surface of each test piece was observed to see whether there was powdering or cracking, and the results were recorded.

[0099] 7. Freeze-thaw resistance

[0100] The test pieces of each embodiment were placed in a freeze-thaw box for 15 cycles, taken out, and the surface of each test piece was observed to see if there was powdering or cracking, and the results were recorded.

[0101] 8. Water expansion rate

[0102] Test according to GB / T 18173.3-2002 and record the results.

[0103] The test results of the above experiments are shown in Table 1 below:

[0104] Table 1 Test data

[0105]

[0106]

[0107] It can be seen from the test data in Table 1 that the various properties of the flexible and highly elastic cement-based grouting materials prepared in Examples 1-5 are better than those in Comparative Examples 1-3, especially having significantly superior flexibility and elasticity (wherein the flexibility is reflected by the elongation at break, and the elasticity is reflected by the elastic modulus), and can adapt well to deformation conditions such as structural settlement; in addition, it also has good strength, acid and alkali resistance, and freeze-thaw resistance, and can effectively improve the waterproof and leak-proof effect of building structures.

[0108] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0109] 1. The present invention endows the cement-based grouting material with the characteristics of flexibility and high elasticity through the modified polymer emulsion of the second component. Traditional cement-based grouting materials are rigid materials, easy to crack, unable to adapt to the settlement of the base layer, and easy to be damaged and fail. The modified polymer emulsion in the present invention can compensate for the microcracks produced by cement gel and fill the pores inside the cement, thereby modifying the cement system and making the cement system have good flexibility and elasticity, so that the condensate of the grouting material can adapt to the deformation of the structure and have better sealing, water blocking and durability.

[0110] 2. The petroleum resin in the second component of the present invention can modify the polymer emulsion and significantly improve its working performance. At the same time, it can improve the compatibility of the polymer emulsion with the cement system, improve the stability of the modified cement system, and avoid stratification.

[0111] 3. The retarder in the first component cement system mixture of the present invention can reduce the heat release rate of cement hydration heat, delay the cement hydration reaction, and prolong the setting and hardening time of the cement system, thereby adjusting the gel time of the modified cement-based grouting material to adapt to the construction needs in different working environments and under different conditions.

[0112] 4. The inorganic filler in the first component cement system mixture of the present invention can control the loss of alkaline substances in the cement system, so that the pH value of the cement system remains stable or even further increases, thereby improving the strength of the cement system.

[0113] 5. The mineral admixture in the first component cement system mixture of the present invention can react with calcium hydroxide or other alkaline earth metal oxides in cement to generate hydraulic cementitious substances, thereby improving the strength and durability of the cement system.

[0114] 6. The water reducing agent in the first component cement system mixture of the present invention can disperse cement particles, improve the working performance of the cement system, increase the fluidity of the cement system, and reduce the shrinkage degree of the cement system.

[0115] 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 this technology to understand the contents of the present invention and implement them accordingly. They cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. A modified cement-based grouting material, characterized in that: The invention comprises a first component and a second component, wherein the first component is a cement system mixture, and the second component is a modified polymer emulsion obtained by modifying a polymer emulsion with a petroleum resin emulsion; the second component comprises a petroleum resin emulsion and a polymer emulsion, and the mass ratio of the petroleum resin emulsion to the polymer emulsion is 1:2.5-3.2; the molecular weight of the petroleum resin is less than 2000; the cement system mixture comprises an inorganic filler composed of sodium metaaluminate, sodium carbonate and calcium oxide; the petroleum resin emulsion is used to modify the polymer emulsion to form a modified polymer emulsion; the modified polymer emulsion is used to modify the cement system, compensate for microcracks generated by cement gel, fill the pores inside the cement, and make the cement system flexible and elastic The mass ratio between the first component and the second component is 1.6 to 2.8:1; In parts by weight, the second component comprises: 8 to 20 parts of petroleum resin emulsion and 25 to 50 parts of polymer emulsion; The petroleum resin emulsion is one of C5 petroleum resin emulsion, C9 petroleum resin emulsion, C5 petroleum resin and C9 petroleum resin copolymer emulsion or DCPD petroleum resin emulsion; the polymer emulsion is one of chloroprene rubber latex, acrylic emulsion, styrene acrylic emulsion and styrene butadiene emulsion or a combination thereof; The cement system mixture includes a retarder, which is one of citric acid, boric acid or tartaric acid; the cement system mixture includes a water reducer, which is one of polycarboxylic acid water reducer, naphthalene water reducer or lignin water reducer; the cement system mixture includes a mineral admixture; the mineral admixture is Class C primary fly ash, and its fineness is not more than 12%; the cement system mixture includes the following raw material components by weight: 35-55 parts of silicate cement, 0.3-0.6 parts of inorganic filler, 0.01-0.05 parts of retarder, 0.15-0.25 parts of water reducer, 0.01-7 parts of mineral admixture, and 22-47 parts of water; The grouting material is prepared by the following steps: Prepare the first component: weigh each component according to the formula ratio, mix the silicate cement, inorganic filler, mineral admixture, water reducer and retarder evenly, then add water, stir well to obtain the first component; Prepare the second component: weigh each component according to the formula ratio, mix the petroleum resin emulsion and the polymer emulsion, and stir evenly to obtain the second component; When the grouting material is used, it is necessary to drill holes and insert needles on the building roof base surface, inject the grouting material into the building base surface with a grouting machine, and keep it dry and cured for 2 days or more.

2. The modified cement-based grouting material according to claim 1, characterized in that: The cement system mixture includes silicate cement, and the silicate cement is ordinary silicate cement with a strength coefficient of 42.5 MPa.

3. The modified cement-based grouting material according to claim 1, characterized in that: The cement system mixture comprises a fungicide, and the fungicide is isothiazolinone and / or an isothiazolinone derivative.

4. The modified cement-based grouting material according to claim 1, characterized in that: The cement system mixture includes water; the resistivity of the water is greater than or equal to 10 megohm·cm.

5. An application of the modified cement-based grouting material as described in any one of claims 1 to 4 in building waterproofing; comprising the following steps: firstly pre-treating the base surface of the building roof to remove oil stains or other debris on the base surface, keeping the surface dry, then drilling holes and inserting needles on the base surface, injecting the grouting material into the building base surface with a double-liquid grouting machine, and keeping it dry for 2 days or more.

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