Waterborne polyurethane concrete based on moisture absorption induction

Abstract

The invention discloses water-based polyurethane concrete based on moisture absorption induction, and belongs to the field of water-based polyurethane concrete.The method comprises the following steps that the target dosage of all raw materials of the water-based polyurethane concrete to be prepared is determined, and the raw materials are prepared according to the target dosage; the method comprises the following steps: preparing CaCl2. 6H2O, and carrying out dehydration recovery on the CaCl2. 6H2O to obtain recovered water and CaCl2; the recycled water quantity is judged, and when a water quantity gap exists, mixed water with Cl <-> smaller than or equal to 100 mg / L is used for supplementing the water quantity gap; preparing a binding agent, and mixing the binding agent with other components to prepare the waterborne polyurethane concrete. According to the method, the chloride-free condensate water is recycled by dehydrating CaCl2. 6H2O, so that water resources are recycled, and the water consumption is reduced; zinc phosphate and carboxylic butadiene-styrene latex in the binding agent have a synergistic effect, a passive film is generated on the surface of the reinforcing steel bar, an interpenetrating network structure is formed, and the interface bonding strength is effectively improved.

Description

Technical Field

[0001] The present invention relates to the technical field of waterborne polyurethane concrete, in particular to a waterborne polyurethane concrete based on moisture absorption induction. Background Art

[0002] In the field of construction engineering, concrete's durability, environmental friendliness, and interfacial bonding performance are key technical challenges affecting structural safety and sustainable development. Traditional concrete preparation consumes large amounts of water and has a low recycling rate. Each ton of concrete requires a significant amount of water, while construction wastewater treatment is costly and inconsistent with the concept of green building. Furthermore, chloride ion corrosion has long plagued the engineering community. When the chloride ion concentration in the mixing water exceeds the rated value, chloride ions penetrate the concrete protective layer, destroying the passivation film on the steel bar surface, leading to an increase in the annual corrosion rate of the steel bar, causing safety hazards such as cracking and reduced bearing capacity. Furthermore, interfacial bonding defects between steel bar surface oxide scale and loose rust significantly affect the mechanical properties of the structure. The loose layer formed by steel bar mill scale and loose rust weakens the mechanical bond with concrete, making it susceptible to slippage or crack expansion under load. While existing technologies have addressed the issue of improving bonding performance through interfacial agents, the synergistic enhancement of chemical anchoring and physical bonding on corroded steel bars is limited. Furthermore, traditional waterborne polyurethane concrete suffers from complex raw material moisture content control and cumbersome chloride ion treatment processes.

[0003] Currently, no effective solutions have been proposed for the problems in related technologies. Summary of the Invention

[0004] In response to the problems in the related art, the present invention proposes a water-based polyurethane concrete based on moisture absorption induction to overcome the technical problems existing in the existing related technology, such as high water resource consumption, insufficient structural durability caused by chloride ion corrosion of steel bars, and low interfacial bonding strength caused by oxide scale and floating rust on the surface of steel bars.

[0005] To this end, the specific technical solutions adopted in the present invention are as follows: A waterborne polyurethane concrete based on moisture absorption induction, the method comprising the following steps: S1. Determine the target amount of each raw material for the waterborne polyurethane concrete to be prepared, and prepare the raw materials according to the target amount; S2, preparing CaCl2·6H2O and dehydrating and recovering it to obtain recycled water and CaCl2; S3. Determine the amount of recycled water. If there is a water gap, use Cl - ≤100mg / L mixed water to make up for the water shortage; S4. preparing a binder, and mixing the binder with other ingredients to form waterborne polyurethane concrete.

[0006] As a preferred embodiment, the target amount of the waterborne polyurethane modified concrete material to be prepared is determined, and the amount of each component is obtained according to the target amount by the following steps: S11, determining the total amount of waterborne polyurethane modified concrete to be prepared, and determining the amount of each raw material based on the total amount; S12, the raw materials of waterborne polyurethane modified concrete are composed of waterborne polyurethane emulsion, Portland cement, quartz sand, hygroscopic salt, additives, added water, catalyst, and binder, wherein the raw materials are 54.5 parts of waterborne polyurethane emulsion, 19 parts of Portland cement, 12.4 parts of quartz sand, 1 part of hygroscopic salt, 1 part of additives, 3.5 parts of added water, 0.3 part of catalyst, and 7.6 parts of binder; S13, the hygroscopic salt is CaCl2, and the additives are composed of a defoamer and a leveling agent, wherein the mass fraction of the defoamer is 0.3 parts and the mass fraction of the leveling agent is 0.7 parts; S14. Prepare raw materials according to the total amount of waterborne polyurethane modified concrete to be prepared and the number of each raw material.

[0007] As a preferred embodiment, the preparation of CaCl2·6H2O and its dehydration recovery to obtain recycled water and CaCl2 includes the following steps: S21. Put CaCl2·6H2O with a purity of ≥98% into a crusher to reduce the particle size to 2 cm-5 cm, and sieve to remove the powder; S22. The crushed CaCl2·6H2O was placed in a fluidized bed and introduced with 180°C hot air at a speed of 3 m / s for dehydration for 30 minutes. Nitrogen was continuously injected at a flow rate of 0.5 m³ / min to prevent oxidation and agglomeration. S23, use infrared moisture meter to detect, when the water content is ≤0.3%, it will automatically stop; S24, introducing the steam-containing exhaust gas into a titanium alloy condensation tower, setting the refrigeration temperature to 5° C., obtaining condensed water, and filtering the condensed water through a 5 μm stainless steel filter element. After filtration, the condensed water is collected and stored; S25. Take out the dehydrated CaCl2·6H2O to obtain CaCl2.

[0008] As a preferred embodiment, the amount of recovered water is judged, and when there is a water gap, Cl is used. - Filling the water gap with mixed water of ≤100mg / L includes the following steps: S31. Determine whether the amount of recycled water meets the total water amount required by the formula. If the amount of recycled water does not meet the total water amount, calculate the water gap and prepare corresponding mixing water according to the water gap. S32. Use a chloride ion selective electrode to detect the Cl⁻ concentration of the mixed water. When Cl⁻ in the mixed water ≤ 100 mg / L, directly mix the mixed water with the recycled water. When 100 mg / L < Cl⁻ ≤ 300 mg / L in the mixed water, add sodium sulfite for treatment. When ORP < 200 mV, it indicates that the mixed water can meet the use standard, and then mix the treated mixed water with the condensate water.

[0009] As a preferred embodiment, the preparation of the binder and the mixing of the binder with other components to form the waterborne polyurethane concrete include the following steps: S41. Prepare the binder raw materials, which are composed of zinc phosphate, silane coupling agent, carboxy styrene butadiene latex, fumed silica, calcium magnesium ore powder, recycled glass powder, modified bentonite, and composite thickening fiber. S42. The mass fractions of each raw material component are: 0.40 parts of zinc phosphate, 0.25 parts of silane coupling agent, 0.20 parts of carboxy styrene butadiene latex, 0.15 parts of fumed silica, 5 parts of calcium magnesium ore powder, 0.8 parts of recycled glass powder, 0.6 parts of modified bentonite, and 0.2 parts of composite thickening fiber. S43. Prepare each raw material component according to the formula and prepare the binder. S44. Use the prepared binder as one of the raw materials of the waterborne polyurethane concrete and conduct the preparation.

[0010] As a preferred embodiment, the preparation of each raw material component according to the formula and the preparation of the binder include the following steps: S431. Slowly add the calcium magnesium ore powder and glass powder into the mixing equipment in sequence, start stirring, set the stirring speed to 100 - 200 r / min, and stir for 5 - 10 minutes. During the stirring process, it is necessary to closely observe the mixing situation of the raw materials to ensure that the two powdery raw materials are preliminarily mixed evenly and avoid local agglomeration. S432. Add zinc phosphate, silane coupling agent, carboxy styrene butadiene latex, and fumed silica in sequence and continue to stir and mix. S433. Add the modified bentonite and composite thickening fiber into the mixing container in sequence, and appropriately reduce the stirring speed to 200 - 300 r / min, and continue to stir for 15 - 20 minutes. S434. After adding all the raw materials, raise the stirring speed to 500 - 800 r / min again and stir for 20 - 30 minutes to make the binder reach a highly uniform state.

[0011] As a preferred embodiment, the use of the prepared binder as one of the raw materials of the waterborne polyurethane concrete and the conduct of the preparation include the following steps: S441, adding the aqueous polyurethane emulsion to a large mixing device, starting stirring, setting the stirring speed to 200-300 r / min, and slowly adding the binder to the aqueous polyurethane emulsion during stirring, and continuing stirring for 15-20 minutes to fully disperse the binder in the aqueous polyurethane emulsion to form a uniform mixture; S442, add Portland cement, quartz sand, and hygroscopic salt in sequence. After adding each raw material, increase the stirring speed to 400-600 r / min and set the stirring time to 10-15 minutes. S443, slowly adding the additive to the mixture, and continuously mixing and stirring, while slowly adding mixing water; S444. Add polyurethane catalyst, increase stirring speed to 600-800 r / min, and stir for 20-30 minutes to allow all ingredients to fully react and mix evenly.

[0012] As a preferred embodiment, the preparation method of the polyurethane emulsion comprises the following steps: S4411, the raw materials of polyurethane emulsion are composed of polyol, diisocyanate, hydrophilic chain extender, small molecule chain extender, neutralizer and condensed water, wherein, polyol 45 parts, diisocyanate 35 parts, hydrophilic chain extender 6 parts, small molecule chain extender 4 parts, neutralizer 2.5 parts and condensed water 7.5 parts; S4412, add polyol to the reactor, turn on the stirrer and set the stirring speed to 100-300 r / min, raise the temperature to 100-120°C, and perform vacuum dehydration for 1-2 hours; S4413. After the polyol is dehydrated and cooled to 50-70°C, diisocyanate is slowly added dropwise through a dropping funnel while stirring. The reaction temperature is controlled between 70-90°C. After the addition is complete, heat and react for 2 to 3 hours to allow the diisocyanate and polyol to fully react to form a prepolymer with terminal isocyanate groups; S4414, adding a hydrophilic chain extender to the reactor to continue reacting with the prepolymer, controlling the reaction temperature to 70-80°C and the reaction time to 1-2 hours; S4415, slowly add the neutralizing agent and continue stirring the reaction for 0.5 to 1 hour; S4416. Slowly add the decondensed water into the reactor and continue stirring for 0.5 to 1 hour to make the emulsion fully uniform.

[0013] The beneficial effects of the present invention are: 1. The present invention condenses and recovers the steam generated during the dehydration process of CaCl2·6H2O. The resulting condensed water can be directly used to prepare waterborne polyurethane concrete. This process significantly reduces dependence on fresh water resources, saves a large amount of water per ton of concrete, and reduces construction costs. 2. When preparing waterborne polyurethane concrete, if the chloride ion content in the mixing water exceeds the standard, the chloride ion will penetrate the concrete protective layer and adsorb on the surface of the steel bar, destroying the steel bar passivation film and accelerating the steel bar corrosion reaction, resulting in a reduction in the cross-sectional area of the steel bar and a decrease in the bond strength, thereby causing safety hazards such as concrete cracking and reduced structural bearing capacity, seriously affecting the durability and service life of the concrete structure. Therefore, the present invention can simplify the processing steps and reduce the cost of additional processing by using recycled condensed water. The chloride ion content of the recycled condensed water is close to zero, and it can be used directly without additional dechlorination treatment. When there is a water gap, the water gap can be supplemented.

[0014] 3. The present invention can significantly improve the interfacial bonding performance between steel bars and concrete by preparing a binder. During concrete pouring, the presence of mill scale and floating rust on the outside of the steel bars will weaken the mechanical bite between the steel bars and concrete. The zinc phosphate added to the binder can form an iron-zinc phosphate composite passivation film on the surface of the steel bars through a chemical reaction, forming a chemical anchoring effect on the mill scale Fe3O4 or floating rust α-FeOOH, thereby improving the interfacial bonding strength. The carboxyl styrene-butadiene latex penetrates into the micropores of the steel bars and the gaps in the rust layer through the emulsion film-forming properties, forming a resin-rust layer-metal interpenetrating network structure, further enhancing the physical bite effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0016] Figure 1 This is a flow chart of a waterborne polyurethane concrete based on moisture absorption induction according to an embodiment of the present invention; Figure 2 The invention relates to a dechlorination process for mixing water of waterborne polyurethane concrete based on moisture absorption induction according to an embodiment of the present invention. DETAILED DESCRIPTION

[0017] To further illustrate each embodiment, the present invention provides drawings, which are part of the disclosure of the present invention. They are mainly used to illustrate the embodiments and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. By referring to these contents, ordinary technicians in this field should be able to understand other possible implementation methods and advantages of the present invention. The components in the figures are not drawn to scale, and similar component symbols are generally used to represent similar components.

[0018] According to an embodiment of the present invention, a waterborne polyurethane concrete based on moisture absorption induction is provided.

[0019] The present invention will now be further described with reference to the accompanying drawings and specific embodiments. Figure 1 As shown, according to an embodiment of the present invention, a waterborne polyurethane concrete based on moisture absorption induction comprises the following steps: S1. Determine the target amount of each raw material for the waterborne polyurethane concrete to be prepared, and prepare the raw materials according to the target amount; Furthermore, the target dosage of the waterborne polyurethane modified concrete material to be prepared is determined, and the dosage of each component is obtained according to the target dosage. The following steps are performed: S11, determining the total amount of waterborne polyurethane modified concrete to be prepared, and determining the amount of each raw material based on the total amount; S12, the raw materials of waterborne polyurethane modified concrete are composed of waterborne polyurethane emulsion, Portland cement, quartz sand, hygroscopic salt, additives, added water, catalyst, and binder, wherein the raw materials are 54.5 parts of waterborne polyurethane emulsion, 19 parts of Portland cement, 12.4 parts of quartz sand, 1 part of hygroscopic salt, 1 part of additives, 3.5 parts of added water, 0.3 part of catalyst, and 7.6 parts of binder; S13, the hygroscopic salt is CaCl2, and the additives are composed of a defoamer and a leveling agent, wherein the mass fraction of the defoamer is 0.3 parts and the mass fraction of the leveling agent is 0.7 parts; S14, prepare raw materials according to the total amount of waterborne polyurethane modified concrete to be prepared and the number of each raw material S2, preparing CaCl2·6H2O and dehydrating and recovering it to obtain recycled water and CaCl2; Further, preparing CaCl2·6H2O and dehydrating and recovering it to obtain recycled water and CaCl2 includes the following steps: S21. Put CaCl2·6H2O with a purity of ≥98% into a crusher to reduce the particle size to 2 cm-5 cm, and sieve to remove the powder; S22. The crushed CaCl2·6H2O was placed in a fluidized bed and introduced with 180°C hot air at a speed of 3 m / s for dehydration for 30 minutes. Nitrogen was continuously injected at a flow rate of 0.5 m³ / min to prevent oxidation and agglomeration. S23. Detect using an infrared moisture meter and automatically stop the machine when the water content is ≤ 0.3%; S24. Introduce the steam-containing waste gas into a titanium alloy condensation tower, set the refrigeration temperature to 5°C to obtain condensed water, and filter the condensed water through a 5μm stainless steel filter element. After filtration, collect and store the condensed water; S25. Take out the dehydrated CaCl2·6H2O to obtain CaCl2.

[0020] It should be noted that using the recycled condensed water to make subsequent concrete has significant advantages; on the one hand, since the recycled condensed water has no chloride ions after treatment, this avoids the corrosion of the steel bars in the concrete by chloride ions; in the concrete structure, the durability of the steel bars is crucial. The presence of chloride ions will accelerate the corrosion of the steel bars, thereby reducing the strength and service life of the concrete structure. Using the recycled condensed water without chloride ions can effectively guarantee the performance of the steel bars and improve the stability and safety of the concrete structure; on the other hand, by condensing and recycling the steam generated during the dehydration process of CaCl2·6H2O, the water that can be used to make concrete is obtained, which can reduce the dependence on fresh water resources, realize the recycling of water resources, greatly save the water use cost, and conform to the concept of green building and environmental protection construction; S3. Judge the recycled water volume. When there is a water volume gap, use the mixed water with Cl - ≤ 100mg / L to fill the water volume gap; Furthermore, judging the recycled water volume. When there is a water volume gap, using the mixed water with Cl - ≤ 100mg / L to fill the water volume gap includes the following steps: S31. Judge whether the recycled water volume meets the total water volume required by the formula. When the recycled water volume does not meet the total water volume, calculate the water volume gap and prepare the corresponding mixed water according to the water volume gap; S32. Use a chloride ion selective electrode to detect the Cl- concentration of the mixed water. When Cl- in the mixed water ≤ 100mg / L, directly mix the mixed water with the recycled water. When 100mg / L < Cl- ≤ 300mg / L in the mixed water, add sodium sulfite for treatment. When ORP < 200mV, it means that the mixed water can meet the use standard, and mix the treated mixed water with the condensed water S4. Prepare a binder and mix the binder with other components to make waterborne polyurethane concrete.

[0021] Furthermore, preparing a binder and mixing the binder with other components to make waterborne polyurethane concrete includes the following steps: S41. Prepare binder raw materials, wherein the binder raw materials are composed of zinc phosphate, silane coupling agent, carboxyl styrene butadiene rubber latex, fumed silica, calcium magnesium ore powder, recycled glass powder, modified bentonite, and composite thickening fiber; S42, the mass parts of each raw material component are: 0.40 parts of zinc phosphate, 0.25 parts of silane coupling agent, 0.20 parts of carboxylated styrene butadiene rubber latex, 0.15 parts of fumed silica, 5 parts of calcium magnesium ore powder, 0.8 parts of recycled glass powder, 0.6 parts of modified bentonite, and 0.2 parts of composite thickening fiber; S43, preparing the raw materials according to the recipe and preparing the binding agent; Furthermore, preparing the raw materials according to the formula and preparing the binder includes the following steps: S431. Slowly add calcium magnesium ore powder and glass powder to the mixing equipment in sequence, start stirring, set the stirring speed to 100-200 r / min, and stir for 5-10 minutes; S432, adding zinc phosphate, silane coupling agent, carboxylated styrene-butadiene rubber latex, and fumed silica in sequence, and continuously stirring and mixing; It should be noted that carboxylated styrene-butadiene latex is in liquid form, so the addition speed should be controlled to prevent splashing. In addition, fumed silica is light and easily floats, so it should be added slowly and as close to the stirring paddle as possible to ensure that it can be quickly stirred and dispersed. After adding each raw material, increase the stirring speed to 400-600 r / min and stir for 10-15 minutes. During the stirring process, pay attention to the temperature changes of the mixture. S433, adding modified bentonite and composite thickening fiber to the mixing container in sequence, and appropriately reducing the stirring speed to 200-300 r / min, and continuing stirring for 15-20 minutes; S434. After all raw materials are added, the stirring speed is increased again to 500-800 r / min and stirred for 20-30 minutes to make the binder reach a highly uniform state; By fixing the proportions of all other ingredients and only changing the ratio of zinc phosphate and carboxylated styrene butadiene latex, the optimal mass proportions of zinc phosphate and carboxylated styrene butadiene latex can be obtained from the following experimental table: Proportional gradient experiment table 1 Experimental data record table 2 S44, using the prepared binder as one of the raw materials for waterborne polyurethane concrete, and preparing it; Furthermore, the prepared binder is used as one of the raw materials for waterborne polyurethane concrete, and the preparation process includes the following steps: S441, adding the aqueous polyurethane emulsion to a large mixing device, starting stirring, setting the stirring speed to 200-300 r / min, and slowly adding the binder to the aqueous polyurethane emulsion during stirring, and continuing stirring for 15-20 minutes to fully disperse the binder in the aqueous polyurethane emulsion to form a uniform mixture; S442, add Portland cement, quartz sand, and hygroscopic salt in sequence. After adding each raw material, increase the stirring speed to 400-600 r / min and set the stirring time to 10-15 minutes. S443, slowly adding the additive to the mixture, and continuously mixing and stirring, while slowly adding mixing water; It should be noted that after adding additives and water, the stirring speed should be reduced to 300-400 r / min and stirred for 15-20 minutes. During the stirring process, the fluidity and foaming of the mixture should be observed to ensure that the defoamer and leveling agent can fully play their role. S444. Add polyurethane catalyst, increase stirring speed to 600-800 r / min, and stir for 20-30 minutes to allow all ingredients to fully react and mix evenly; Furthermore, the preparation method of the polyurethane emulsion comprises the following steps: S4411, the raw materials of polyurethane emulsion are composed of polyol, diisocyanate, hydrophilic chain extender, small molecule chain extender, neutralizer and condensed water, wherein, polyol 45 parts, diisocyanate 35 parts, hydrophilic chain extender 6 parts, small molecule chain extender 4 parts, neutralizer 2.5 parts and condensed water 7.5 parts; S4412, add polyol to the reactor, turn on the stirrer and set the stirring speed to 100-300 r / min, raise the temperature to 100-120°C, and perform vacuum dehydration for 1-2 hours; S4413. After the polyol is dehydrated and cooled to 50-70°C, diisocyanate is slowly added dropwise through a dropping funnel while stirring. The reaction temperature is controlled between 70-90°C. S4414, adding a hydrophilic chain extender to the reactor to continue reacting with the prepolymer, controlling the reaction temperature to 70-80°C and the reaction time to 1-2 hours; S4415, slowly add the neutralizing agent and continue stirring the reaction for 0.5 to 1 hour; S4416. Slowly add the decondensed water into the reactor and continue stirring for 0.5 to 1 hour to make the emulsion fully uniform.

[0022] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A waterborne polyurethane concrete based on moisture absorption induction, characterized in that: The method comprises the following steps: S1. Determine the target amount of each raw material for the waterborne polyurethane concrete to be prepared, and prepare the raw materials according to the target amount; S2, preparing CaCl2·6H2O and dehydrating and recovering it to obtain recycled water and CaCl2; S3. Determine the amount of recycled water. If there is a water gap, use Cl - ≤100mg / L mixed water to make up for the water shortage; S4. preparing a binder, and mixing the binder with other ingredients to form waterborne polyurethane concrete.

2. The waterborne polyurethane concrete based on moisture absorption induction according to claim 1, characterized in that: Determine the target dosage of the waterborne polyurethane modified concrete material to be prepared, and obtain the dosage of each component according to the target dosage. S11, determining the total amount of waterborne polyurethane modified concrete to be prepared, and determining the amount of each raw material based on the total amount; S12, the raw materials of waterborne polyurethane modified concrete are composed of waterborne polyurethane emulsion, Portland cement, quartz sand, hygroscopic salt, additives, added water, catalyst, and binder, wherein the raw materials are 54.5 parts of waterborne polyurethane emulsion, 19 parts of Portland cement, 12.4 parts of quartz sand, 1 part of hygroscopic salt, 1 part of additives, 3.5 parts of added water, 0.3 part of catalyst, and 7.6 parts of binder; S13, the hygroscopic salt is CaCl2, and the additives are composed of a defoamer and a leveling agent, wherein the mass fraction of the defoamer is 0.3 parts and the mass fraction of the leveling agent is 0.7 parts; S14. Prepare raw materials according to the total amount of waterborne polyurethane modified concrete to be prepared and the number of each raw material.

3. The waterborne polyurethane concrete based on moisture absorption induction according to claim 1, characterized in that: The preparation of CaCl2·6H2O and its dehydration and recovery to obtain recycled water and CaCl2 comprises the following steps: S21. Put CaCl2·6H2O with a purity of ≥98% into a crusher to reduce the particle size to 2 cm-5 cm, and sieve to remove the powder; S22. The crushed CaCl2·6H2O was placed in a fluidized bed and introduced with 180°C hot air at a speed of 3 m / s for dehydration for 30 minutes. Nitrogen was continuously injected at a flow rate of 0.5 m³ / min to prevent oxidation and agglomeration. S23, use infrared moisture meter to detect, when the water content is ≤0.3%, it will automatically stop; S24, introducing the steam-containing exhaust gas into a titanium alloy condensation tower, setting the refrigeration temperature to 5° C., obtaining condensed water, and filtering the condensed water through a 5 μm stainless steel filter element. After filtration, the condensed water is collected and stored; S25. Take out the dehydrated CaCl2·6H2O to obtain CaCl2.

4. The waterborne polyurethane concrete based on moisture absorption induction according to claim 3, characterized in that: When judging the amount of recycled water, if there is a water gap, use Cl - Filling the water gap with mixed water of ≤100mg / L includes the following steps: S31. Determine whether the amount of recycled water meets the total water amount required by the formula. If the amount of recycled water does not meet the total water amount, calculate the water gap and prepare corresponding mixing water according to the water gap. S32. Use a chloride ion selective electrode to detect the Cl- concentration of the mixed water. When Cl- in the mixed water is ≤100 mg / L, directly mix the mixed water with the recycled water. When 100 mg / L < Cl- ≤ 300 mg / L in the mixed water, add sodium sulfite for treatment. When ORP <200 mV, it indicates that the mixed water meets the use standard, and the treated mixed water is mixed with the condensed water.

5. The waterborne polyurethane concrete based on moisture absorption induction according to claim 4, characterized in that: The preparation of the binder and mixing the binder with other ingredients to form waterborne polyurethane concrete comprises the following steps: S41. Prepare binder raw materials, wherein the binder raw materials are composed of zinc phosphate, silane coupling agent, carboxyl styrene butadiene rubber latex, fumed silica, calcium magnesium ore powder, recycled glass powder, modified bentonite, and composite thickening fiber; S42, the mass parts of each raw material component are: 0.40 parts of zinc phosphate, 0.25 parts of silane coupling agent, 0.20 parts of carboxylated styrene butadiene rubber latex, 0.15 parts of fumed silica, 5 parts of calcium magnesium ore powder, 0.8 parts of recycled glass powder, 0.6 parts of modified bentonite, and 0.2 parts of composite thickening fiber; S43, preparing the raw materials according to the recipe and preparing the binding agent; S44. Using the prepared binder as one of the raw materials for waterborne polyurethane concrete and preparing the same.

6. The waterborne polyurethane concrete based on moisture absorption induction according to claim 5, characterized in that: The steps of preparing the raw materials according to the formula and preparing the binder include: S431. Slowly add calcium magnesium ore powder and glass powder to the mixing equipment in sequence, start stirring, set the stirring speed to 100-200 r / min, and stir for 5-10 minutes; S432, adding zinc phosphate, silane coupling agent, carboxylated styrene-butadiene rubber latex, and fumed silica in sequence, and continuously stirring and mixing; S433, adding modified bentonite and composite thickening fiber to the mixing container in sequence, and appropriately reducing the stirring speed to 200-300 r / min, and continuing stirring for 15-20 minutes; S434. After all raw materials are added, increase the stirring speed to 500-800 r / min again and stir for 20-30 minutes to make the binder reach a highly uniform state.

7. The waterborne polyurethane concrete based on moisture absorption induction according to claim 5, characterized in that: The prepared binder is used as one of the raw materials of waterborne polyurethane concrete, and the preparation includes the following steps: S441, adding the aqueous polyurethane emulsion to a large mixing device, starting stirring, setting the stirring speed to 200-300 r / min, and slowly adding the binder to the aqueous polyurethane emulsion during stirring, and continuing stirring for 15-20 minutes to fully disperse the binder in the aqueous polyurethane emulsion to form a uniform mixture; S442, add Portland cement, quartz sand, and hygroscopic salt in sequence. After adding each raw material, increase the stirring speed to 400-600 r / min and set the stirring time to 10-15 minutes. S443, slowly adding the additive to the mixture, and continuously mixing and stirring, while slowly adding mixing water; S444. Add polyurethane catalyst, increase stirring speed to 600-800 r / min, and stir for 20-30 minutes to allow all ingredients to fully react and mix evenly.

8. The waterborne polyurethane concrete based on moisture absorption induction according to claim 7, characterized in that: The preparation method of the polyurethane emulsion comprises the following steps: S4411, the raw materials of polyurethane emulsion are composed of polyol, diisocyanate, hydrophilic chain extender, small molecule chain extender, neutralizer and condensed water, wherein, polyol 45 parts, diisocyanate 35 parts, hydrophilic chain extender 6 parts, small molecule chain extender 4 parts, neutralizer 2.5 parts and condensed water 7.5 parts; S4412, add polyol to the reactor, turn on the stirrer and set the stirring speed to 100-300 r / min, raise the temperature to 100-120°C, and perform vacuum dehydration for 1-2 hours; S4413. After the polyol is dehydrated and cooled to 50-70°C, diisocyanate is slowly added dropwise through a dropping funnel while stirring. The reaction temperature is controlled between 70-90°C. S4414, adding a hydrophilic chain extender to the reactor to continue reacting with the prepolymer, controlling the reaction temperature to 70-80°C and the reaction time to 1-2 hours; S4415, slowly add the neutralizing agent and continue stirring the reaction for 0.5 to 1 hour; S4416. Slowly add the decondensed water into the reactor and continue stirring for 0.5 to 1 hour to make the emulsion fully uniform.

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