CN110229611B - Cement concrete component surface protective agent and preparation method thereof - Google Patents
Cement concrete component surface protective agent and preparation method thereof Download PDFInfo
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Abstract
本发明涉及一种水泥混凝土构件表面防护剂及其制备方法，其包括如下重量份的组分：异辛基三乙氧基硅烷3~5份、笼型倍半硅氧烷1~1.2份、硅烷吸附剂0.3~1份、盐酸阻聚剂25~35份、质量浓度为20~22%的氢氧化钠8~13份、水50~55份和硅烷偶联剂3~5份；在硅烷吸附剂的作用下，异辛基三乙氧基硅烷会大量附着在笼型倍半硅氧烷中，防护剂渗透入混凝土孔隙内部，混凝土中的硅、钙在水的作用下生成硅酸钙化合物，硅酸钙化合物在混凝土中起主要强度作用，而笼型倍半硅氧烷可进一步提高与其他组分的吸附性能，还可起到骨架支撑作用，进一步提高混凝土构件的抗渗性、强度和硬度。The invention relates to a surface protective agent for cement concrete components and a preparation method thereof, comprising the following components in parts by weight: 3-5 parts of isooctyl triethoxysilane, 1-1.2 parts of cage silsesquioxane, 0.3-1 part of silane adsorbent, 25-35 parts of hydrochloric acid polymerization inhibitor, 8-13 parts of sodium hydroxide with mass concentration of 20-22%, 50-55 parts of water and 3-5 parts of silane coupling agent; Under the action of the adsorbent, isooctyltriethoxysilane will adhere to the cage silsesquioxane in large quantities, the protective agent penetrates into the interior of the concrete pores, and the silicon and calcium in the concrete form calcium silicate under the action of water. Calcium silicate compounds play a major role in strength in concrete, while cage silsesquioxane can further improve the adsorption performance with other components, and can also play a skeleton support role to further improve the impermeability of concrete components, strength and hardness.
Description
Technical Field
The invention relates to the technical field of concrete protection, in particular to a cement concrete member surface protective agent and a preparation method thereof.
Background
The cement concrete material is a multi-phase and porous substance, and various durability performances of the concrete such as dry-wet cycle damage, carbonization damage, chloride ion corrosion, sulfate damage, freeze-thaw damage and the like are almost related to permeability, because the permeability of the concrete controls the penetration rate of liquid (or gas), and harmful liquid or gas is subjected to a series of physical, chemical or mechanical actions with the components of the concrete after penetrating into the concrete.
The water is used as a carrying tool of erosion ions, and products caused by chemical erosion can be timely carried out of the concrete body and then are supplemented with the erosion ions, so that vicious circle is caused; the water itself also plays a role in non-unity, and because the concrete is saturated with water, when the concrete is frozen, the water freezes to cause frost cracking of the concrete; water is one of the necessary conditions for the alkali-aggregate reaction of concrete, and therefore, improving the impermeability of concrete is one of the important measures for improving the durability of concrete.
Currently, the most common protective measures for concrete are to treat the surface of the concrete, such as coating the surface of the concrete with silicone emulsion or water-based epoxy to form a hydrophobic layer or protective film on the surface of the concrete. A common protection method comprises the steps of adding 0.5-2.5 parts of methyl trichlorosilane into 0.2-0.6 part of 18% -22% hydrochloric acid solution, fully mixing to obtain methyl silicic acid, removing the hydrochloric acid solution, adding 0.1-1.5 parts of sodium hydroxide solution to obtain stock solution, and diluting the stock solution according to use requirements to obtain the protective agent. However, in the using process of the protective agent, the strength of the repaired concrete is not as high as that of the original concrete, so that the use limitation is caused.
Disclosure of Invention
The invention aims to provide a cement concrete member surface protective agent, the protected concrete has higher strength, the strength is equivalent to the strength of the concrete body, and the application field is widened.
The above object of the present invention is achieved by the following technical solutions:
the surface protective agent for the cement concrete member comprises the following components in parts by weight: 3-5 parts of isooctyltriethoxysilane, 1-1.2 parts of cage-type silsesquioxane, 0.3-1 part of a silane adsorbent, 25-35 parts of a hydrochloric acid polymerization inhibitor, 8-13 parts of sodium hydroxide with the mass concentration of 20-22%, 50-55 parts of water and 3-5 parts of a silane coupling agent.
By adopting the technical scheme, under the action of the silane adsorbent, a large amount of isooctyl triethoxysilane can be attached to the cage-type silsesquioxane, the protective agent permeates into the pores of the concrete, silicon and calcium in the concrete generate calcium silicate compounds under the action of water, the calcium silicate compounds play a main strength role in the concrete, the cage type silsesquioxane plays a role in supporting the framework, can further improve the strength and the hardness of concrete, and in addition, after the concrete is initially set, hydration reaction is still carried out, the reaction can not be completely carried out under the natural state, a large amount of free cage-type silsesquioxane is in a cage type, which is beneficial to component attachment, and active silicate ions in the protective agent and unreacted free calcium ions in the concrete generate calcium silicate hydrate, so that the calcium ions in the concrete further participate in the reaction, and the strength, the hardness and the impermeability of the concrete are further improved.
The invention is further configured to: the relative molecular mass of the cage-type silsesquioxane is 2500-3000.
By adopting the technical scheme, the relative molecular mass of the cage-type silsesquioxane is limited within the range of 2500-3000, the intermolecular interaction force is large, and the framework structure of the cage-type silsesquioxane can have large adsorption force, so that the cage-type silsesquioxane has high adsorption performance with other components.
The invention is further configured that the silane adsorbent comprises the following components in parts by weight: 10-15 parts of calcined kaolin, 5-10 parts of argil, 3-5 parts of heavy metal stone powder, 10-12 parts of polyborosiloxane, 15-20 parts of diatomite slurry and 5-10 parts of magnesium chloride.
By adopting the technical scheme, the calcined kaolin has more active points and fine and uniform particle size, and compared with uncalcined kaolin, the hardness is unchanged and the tensile strength is improved; the argil has higher cohesive force, and good plasticity and sintering performance; the heavy metal stone powder can increase the thickness, strength and durability of the coating and can also improve the early strength of concrete; the polyborosiloxane is used as a binder and can be used for uniformly dispersing calcined kaolin, argil and heavy goldfine powder; the diatomite slurry has excellent elasticity, higher impact strength, tensile strength and tear strength, light and soft body and high fineness; the diatomite slurry has strong adsorption performance, neutral pH value, no toxicity and good mixing uniformity, can also obviously improve the corrosion resistance and the strength of the product, has a sedimentation volume of 95 percent, can improve the chemical performances of the product such as heat resistance, wear resistance, heat preservation, ageing resistance and the like, and also has the advantages of capacity increase, thickening and high adhesive force; magnesium chloride is a coagulant with excellent performance; the silane adsorbent prepared by the formula has good adsorption performance, and simultaneously has high strength, durability and corrosion resistance.
The invention is further configured to: the diatomite slurry comprises the following components in parts by weight: 20-25 parts of diatomite, 40-45 parts of methyl methacrylate, 10-15 parts of redispersible latex powder, 3-5 parts of titanate coupling agent, 1-3 parts of KH-550and 0.1-0.3 part of cumene hydroperoxide.
By adopting the technical scheme, methyl methacrylate is subjected to self-crosslinking reaction, the diatomite is grafted on a branched chain structure of the methyl methacrylate, and the redispersible latex powder is dispersed in a self-crosslinking system, so that the diatomite slurry has the advantages of excellent elasticity, higher impact strength, tensile strength, tearing strength, light and soft constitution and high fineness.
The invention is further configured to: the viscosity of the diatomite slurry is 200-1000 centipoises.
By adopting the technical scheme, the diatomite slurry with the viscosity of 200-1000 centipoises can ensure the fluidity of the diatomite slurry, can also ensure the uniform dispersion of other components in the diatomite slurry, and plays beneficial thickening and reinforcing roles.
The invention is further configured to: the preparation method of the silane adsorbent comprises the following steps:
(1) putting polyborosiloxane into a high-speed mixer, adjusting the temperature to 175-185 ℃, and waiting for the polyborosiloxane to be completely melted;
(2) uniformly dispersing calcined kaolin, argil and heavy gold stone powder in polyborosiloxane to obtain a blend;
(3) calcining the blend at high temperature, and crushing the calcined blend into a micron-sized porous structure;
(4) adding the micron-sized porous structure into the diatomite slurry, and uniformly stirring;
(5) adding magnesium chloride, and stirring.
By adopting the technical scheme, when the silane adsorbent is prepared, the high-strength high-dispersion micron-sized powder is prepared in advance, the micron-sized powder is formed by uniformly dispersing calcined kaolin, argil and heavy gold stone powder in molten polyborosiloxane, then calcining and crushing at high temperature to form a micron-sized porous structure, the micron-sized porous structure is uniformly dispersed in diatomite slurry, and the thickening agent magnesium chloride is added, so that the silane adsorbent with strong adsorbability and high adhesiveness can be prepared.
The second aim of the invention is realized by the following technical scheme:
a preparation method of a cement concrete member surface protective agent comprises the following steps:
(1) uniformly mixing isooctyl triethoxysilane, cage-type silsesquioxane and a silane adsorbent for 2-3 hours to obtain a modified monomer;
(2) adding a silane coupling agent and water into the modified monomer, and uniformly mixing to obtain a preformed body;
(3) adding a hydrochloric acid polymerization inhibitor into the preformed body, and reacting for 6-8 h; heating to remove a hydrochloric acid solution, and then adding sodium hydroxide with the mass concentration of 20-22% to obtain a protective agent for later use;
(4) and spraying or brushing the protective agent on the surface breakage of the cement concrete member.
By adopting the technical scheme, isooctyl triethoxysilane is dispersed on a cage-type framework of cage-type silsesquioxane, uniformly stirred to form a preformed body, and then the preformed body reacts with a hydrochloric acid polymerization inhibitor and sodium hydroxide to generate an insoluble waterproof high molecular compound which has certain permeability and impermeability and can form a film-shaped surface.
The invention is further configured to: in the step (1), the mixing temperature is controlled to be 60-80 ℃.
By adopting the technical scheme, when the isooctyl triethoxysilane is modified, the reaction temperature is increased to 60-80 ℃, the composition of the isooctyl triethoxysilane and the cage-type silsesquioxane can be improved, and the composite effect is firmer.
In conclusion, the beneficial technical effects of the invention are as follows:
1. high strength, high hardness: the monomer isooctyl triethoxysilane is modified by the cage-type silsesquioxane, and the silane adsorbent is added, so that the micron-sized porous structure has excellent adsorption performance, and the adhesion of the isooctyl triethoxysilane on the cage-type silsesquioxane can be improved, thereby being beneficial to improving the strength and hardness of the protective agent;
2. excellent water-proof and seepage-proof properties: after the protective agent is coated, high-molecular organic cross-linked substances and surface films with high density are formed on the surface and in the limited depth of the cement concrete member, and the cement concrete member has waterproofness, seepage resistance and corrosion resistance;
3. the silane adsorbent has moderate viscosity, and can ensure good spraying property.
Detailed Description
The present invention will be described in further detail with reference to examples.
The first embodiment is as follows:
the diatomite slurry is prepared by the following preparation method:
(1) preparing materials: weighing 20 parts of diatomite, 40 parts of methyl methacrylate, 10 parts of redispersible latex powder, 3 parts of titanate coupling agent, KH-5501 parts and 0.1 part of cumene hydroperoxide according to parts by weight;
(2) adding titanate coupling agent and KH-550 into methyl methacrylate, and uniformly stirring;
(3) continuously adding the diatomite and the redispersible latex powder, and uniformly stirring;
(4) cumene hydroperoxide was added to initiate the polymerization.
Example two:
the diatomite slurry is prepared by the following preparation method:
(1) preparing materials: weighing 22 parts of diatomite, 42 parts of methyl methacrylate, 12 parts of redispersible latex powder, 3.5 parts of titanate coupling agent, KH-5501.5 parts and 0.15 part of cumene hydroperoxide according to parts by weight;
(2) adding titanate coupling agent and KH-550 into methyl methacrylate, and uniformly stirring;
(3) continuously adding the diatomite and the redispersible latex powder, and uniformly stirring;
(4) cumene hydroperoxide was added to initiate the polymerization.
Example three:
the diatomite slurry is prepared by the following preparation method:
(1) preparing materials: weighing 23 parts of diatomite, 43 parts of methyl methacrylate, 13 parts of redispersible latex powder, 4 parts of titanate coupling agent, KH-5502 parts and 0.2 part of cumene hydroperoxide according to parts by weight;
(2) adding titanate coupling agent and KH-550 into methyl methacrylate, and uniformly stirring;
(3) continuously adding the diatomite and the redispersible latex powder, and uniformly stirring;
(4) cumene hydroperoxide was added to initiate the polymerization.
Example four:
the diatomite slurry is prepared by the following preparation method:
(1) preparing materials: weighing 24 parts of diatomite, 44 parts of methyl methacrylate, 14 parts of redispersible latex powder, 4.5 parts of titanate coupling agent, KH-5502.5 parts and 0.25 part of cumene hydroperoxide according to parts by weight;
(2) adding titanate coupling agent and KH-550 into methyl methacrylate, and uniformly stirring;
(3) continuously adding the diatomite and the redispersible latex powder, and uniformly stirring;
(4) cumene hydroperoxide was added to initiate the polymerization.
Example five:
the diatomite slurry is prepared by the following preparation method:
(1) preparing materials: weighing 25 parts of diatomite, 45 parts of methyl methacrylate, 15 parts of redispersible latex powder, 5 parts of titanate coupling agent, KH-5503 parts and 0.3 part of cumene hydroperoxide according to parts by weight;
(2) adding titanate coupling agent and KH-550 into methyl methacrylate, and uniformly stirring;
(3) continuously adding the diatomite and the redispersible latex powder, and uniformly stirring;
(4) cumene hydroperoxide was added to initiate the polymerization.
Example six:
a silane adsorbent is prepared by the following method:
(1) preparing materials: according to the parts by weight, 10 parts of calcined kaolin, 5 parts of argil, 3 parts of heavy gold stone powder, 10 parts of polyborosiloxane, 15 parts of diatomite slurry and 5 parts of magnesium chloride are weighed, wherein the diatomite slurry is prepared by adopting the first embodiment;
(2) putting polyborosiloxane into a high-speed mixer, adjusting the temperature to 175 ℃, and waiting for the polyborosiloxane to be completely melted;
(3) uniformly dispersing calcined kaolin, argil and heavy gold stone powder in polyborosiloxane to obtain a blend;
(4) calcining the blend at high temperature, and crushing the calcined blend into a micron-sized porous structure;
(5) adding the porous structure into the diatomite slurry, and uniformly stirring;
(6) adding magnesium chloride, and uniformly stirring to obtain the silane adsorbent.
Example seven:
a silane adsorbent is prepared by the following method:
(1) preparing materials: weighing 12 parts of calcined kaolin, 6 parts of argil, 3.5 parts of heavy gold stone powder, 11 parts of polyborosiloxane, 17 parts of diatomite slurry and 7 parts of magnesium chloride according to parts by weight, wherein the diatomite slurry is prepared by adopting the second embodiment;
(2) putting polyborosiloxane into a high-speed mixer, adjusting the temperature to 178 ℃, and waiting for the polyborosiloxane to be completely melted;
(3) uniformly dispersing calcined kaolin, argil and heavy gold stone powder in polyborosiloxane to obtain a blend;
(4) calcining the blend at high temperature, and crushing the calcined blend into a micron-sized porous structure;
(5) adding the porous structure into the diatomite slurry, and uniformly stirring;
(6) adding magnesium chloride, and uniformly stirring to obtain the silane adsorbent.
Example eight:
a silane adsorbent is prepared by the following method:
(1) preparing materials: according to the weight parts, 13 parts of calcined kaolin, 8 parts of argil, 4 parts of heavy gold stone powder, 11 parts of polyborosiloxane, 18 parts of diatomite slurry and 8 parts of magnesium chloride are weighed, and the diatomite slurry is prepared by adopting the third embodiment;
(2) putting polyborosiloxane into a high-speed mixer, adjusting the temperature to 180 ℃, and waiting for the polyborosiloxane to be completely melted;
(3) uniformly dispersing calcined kaolin, argil and heavy gold stone powder in polyborosiloxane to obtain a blend;
(4) calcining the blend at high temperature, and crushing the calcined blend into a micron-sized porous structure;
(5) adding the porous structure into the diatomite slurry, and uniformly stirring;
(6) adding magnesium chloride, and uniformly stirring to obtain the silane adsorbent.
Example nine:
a silane adsorbent is prepared by the following method:
(1) preparing materials: according to the weight parts, 13 parts of calcined kaolin, 9 parts of argil, 4.5 parts of heavy gold stone powder, 11.5 parts of polyborosiloxane, 19 parts of diatomite slurry and 8 parts of magnesium chloride are weighed, wherein the diatomite slurry is prepared by adopting the fourth embodiment;
(2) putting polyborosiloxane into a high-speed mixer, adjusting the temperature to 182 ℃, and waiting for the polyborosiloxane to be completely melted;
(3) uniformly dispersing calcined kaolin, argil and heavy gold stone powder in polyborosiloxane to obtain a blend;
(4) calcining the blend at high temperature, and crushing the calcined blend into a micron-sized porous structure;
(5) adding the porous structure into the diatomite slurry, and uniformly stirring;
(6) adding magnesium chloride, and uniformly stirring to obtain the silane adsorbent.
Example ten:
a silane adsorbent is prepared by the following method:
(1) preparing materials: weighing 15 parts of calcined kaolin, 10 parts of argil, 5 parts of heavy goldfine powder, 12 parts of polyborosiloxane, 20 parts of diatomite slurry and 10 parts of magnesium chloride according to parts by weight, wherein the diatomite slurry is prepared by adopting the fifth embodiment;
(2) putting polyborosiloxane into a high-speed mixer, adjusting the temperature to 185 ℃, and waiting for the polyborosiloxane to be completely melted;
(3) uniformly dispersing calcined kaolin, argil and heavy gold stone powder in polyborosiloxane to obtain a blend;
(4) calcining the blend at high temperature, and crushing the calcined blend into a micron-sized porous structure;
(5) adding the porous structure into the diatomite slurry, and uniformly stirring;
(6) adding magnesium chloride, and uniformly stirring to obtain the silane adsorbent.
Example eleven:
a surface protective agent for a cement concrete member is prepared by the following method:
(1) preparing materials: 3 parts of isooctyltriethoxysilane, 1 part of cage-type silsesquioxane, 0.3 part of silane adsorbent, 25 parts of hydrochloric acid polymerization inhibitor, 8 parts of sodium hydroxide with the mass concentration of 20%, 50 parts of water and 3 parts of silane coupling agent are weighed according to the parts by weight, the silane coupling agent is KH-570, the hydrochloric acid polymerization inhibitor is hydrochloric acid solution with the mass concentration of 20%, and the silane adsorbent is prepared by adopting the sixth embodiment;
(2) uniformly mixing isooctyl triethoxysilane, cage-type silsesquioxane and a silane adsorbent for 2-3 hours to obtain a modified monomer;
(3) adding a silane coupling agent and water into the modified monomer, and uniformly mixing to obtain a preformed body;
(4) adding a hydrochloric acid polymerization inhibitor into the preformed body, and reacting for 6 hours; heating to remove hydrochloric acid solution, and adding sodium hydroxide to obtain protective agent;
(5) the protective agent is sprayed or brushed on the surface or the breakage of the cement concrete member.
Example twelve:
a surface protective agent for a cement concrete member is prepared by the following method:
(1) preparing materials: 3.5 parts of isooctyltriethoxysilane, 1.1 parts of cage-type silsesquioxane, 0.5 part of silane adsorbent, 28 parts of hydrochloric acid polymerization inhibitor, 8 parts of sodium hydroxide with the mass concentration of 20%, 50 parts of water and 3.5 parts of silane coupling agent are weighed according to the parts by weight, wherein the hydrochloric acid polymerization inhibitor adopts hydrochloric acid solution with the mass concentration of 20%, and the silane adsorbent is prepared by adopting the sixth embodiment;
(2) uniformly mixing isooctyl triethoxysilane, cage-type silsesquioxane and a silane adsorbent for 2-3 hours to obtain a modified monomer;
(3) adding a silane coupling agent and water into the modified monomer, and uniformly mixing to obtain a preformed body;
(4) adding a hydrochloric acid polymerization inhibitor into the preformed body, and reacting for 6.5 hours; heating to remove hydrochloric acid solution, and adding sodium hydroxide with mass concentration of 20% to obtain protective agent for later use;
(5) the protective agent is sprayed or brushed on the surface or the breakage of the cement concrete member.
Example thirteen:
a surface protective agent for a cement concrete member is prepared by the following method:
(1) preparing materials: weighing 4 parts of isooctyltriethoxysilane, 1.1 parts of cage-type silsesquioxane, 0.7 part of silane adsorbent, 30 parts of hydrochloric acid polymerization inhibitor, 10 parts of sodium hydroxide with the mass concentration of 21%, 52 parts of water and 4 parts of silane coupling agent according to parts by weight;
(2) uniformly mixing isooctyl triethoxysilane, cage-type silsesquioxane and a silane adsorbent for 2-3 hours to obtain a modified monomer;
(3) adding a silane coupling agent and water into the modified monomer, and uniformly mixing to obtain a preformed body;
(4) adding a hydrochloric acid polymerization inhibitor into the preformed body, and reacting for 7 hours; heating to remove hydrochloric acid solution, and adding sodium hydroxide with mass concentration of 22% to obtain protective agent for later use;
(5) the protective agent is sprayed or brushed on the surface or the breakage of the cement concrete member.
Example fourteen:
a surface protective agent for a cement concrete member is prepared by the following method:
(1) preparing materials: weighing 4.5 parts of isooctyltriethoxysilane, 1.2 parts of cage-type silsesquioxane, 0.8 part of silane adsorbent, 32 parts of hydrochloric acid polymerization inhibitor, 11 parts of sodium hydroxide with the mass concentration of 22%, 53 parts of water and 4.5 parts of silane coupling agent according to parts by weight;
(2) uniformly mixing isooctyl triethoxysilane, cage-type silsesquioxane and a silane adsorbent for 2-3 hours to obtain a modified monomer;
(3) adding a silane coupling agent and water into the modified monomer, and uniformly mixing to obtain a preformed body;
(4) adding a hydrochloric acid polymerization inhibitor into the preformed body, and reacting for 7.5 hours; heating to remove hydrochloric acid solution, and adding sodium hydroxide with mass concentration of 22% to obtain protective agent for later use;
(5) the protective agent is sprayed or brushed on the surface or the breakage of the cement concrete member.
Example fifteen:
a surface protective agent for a cement concrete member is prepared by the following method:
(1) preparing materials: weighing 5 parts of isooctyltriethoxysilane, 1.2 parts of cage-type silsesquioxane, 1 part of silane adsorbent, 35 parts of hydrochloric acid polymerization inhibitor, 13 parts of sodium hydroxide with the mass concentration of 22%, 55 parts of water and 5 parts of silane coupling agent according to parts by weight;
(2) uniformly mixing isooctyl triethoxysilane, cage-type silsesquioxane and a silane adsorbent for 2-3 hours to obtain a modified monomer;
(3) adding a silane coupling agent and water into the modified monomer, and uniformly mixing to obtain a preformed body;
(4) adding a hydrochloric acid polymerization inhibitor into the preformed body, and reacting for 8 hours; heating to remove hydrochloric acid solution, and adding sodium hydroxide with mass concentration of 22% to obtain protective agent for later use;
(5) the protective agent is sprayed or brushed on the surface or the breakage of the cement concrete member.
Comparative example one: unprotected concrete.
A protective agent is prepared by the following method: adding 2 parts of methyl trichlorosilane into 0.5 part of 20% hydrochloric acid solution, fully mixing to obtain methyl silicic acid, removing the hydrochloric acid solution, adding 1 part of sodium hydroxide solution to obtain stock solution, and diluting by 10 times to obtain a comparative example II; the dilution was 20-fold to prepare comparative example three.
Taking a maintenance and processing project of a lower structure of a Fuzhou-Ningde expressway as a construction object, specifically selecting a tidal range area on a Yunxi No. 1 bridge, respectively protecting by adopting eleventh to fifteenth embodiments and comparative examples, and comparing the detection results of the eleventh to fifteenth embodiments, the second comparative example and the third comparative example with the first comparative example, wherein the results are shown in the following table:
| sample (I) | Osmotic pressure (%) | Water absorption (%) | Compressive strength (%) | Flexural Strength (%) | Hardness (%) |
| Example one | 65 | 52 | 38 | 29 | 32 |
| Example two | 66 | 50 | 39 | 30 | 33 |
| EXAMPLE III | 67 | 48 | 40 | 31 | 33 |
| Example four | 67 | 45 | 42 | 31 | 34 |
| EXAMPLE five | 65 | 46 | 38 | 30 | 32 |
| Comparative example No. two | 46 | 61 | 25 | 18 | 25 |
| Comparative example No. three | 42 | 65 | 23 | 15 | 23 |
As can be seen from the above table, the concrete treated by the protective agent of the embodiment has excellent strength and hardness, can still maintain good service performance after protection, and has improved water resistance and seepage resistance, and excellent protection effect.
The embodiments of the present invention are preferred embodiments of the present invention, and the scope of the present invention is not limited by these embodiments, so: all equivalent changes made according to the structure, shape and principle of the invention are covered by the protection scope of the invention.
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