CN113387651A - Polyurethane concrete with long setting time and good construction workability for paving steel bridge deck in seasonal frozen region and preparation method thereof - Google Patents
Polyurethane concrete with long setting time and good construction workability for paving steel bridge deck in seasonal frozen region and preparation method thereof Download PDFInfo
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- CN113387651A CN113387651A CN202110728080.2A CN202110728080A CN113387651A CN 113387651 A CN113387651 A CN 113387651A CN 202110728080 A CN202110728080 A CN 202110728080A CN 113387651 A CN113387651 A CN 113387651A
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
- C04B24/24—Macromolecular compounds
- C04B24/28—Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- C04B24/282—Polyurethanes; Polyisocyanates
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/40—High-molecular-weight compounds
- C08G18/48—Polyethers
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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Abstract
A polyurethane concrete for paving a steel bridge deck in a freezing region with long setting time and good construction workability and a preparation method thereof. The invention belongs to the field of novel concrete. The invention aims to solve the technical problems that the polyurethane concrete of the existing system has short setting time, is inconvenient to construct, cannot finish the construction processes of stirring, discharging, paving and the like in the setting time under the current technical conditions, even possibly causes that materials are solidified in a stirring tank without discharging, and has poor construction workability. The polyurethane concrete is prepared from isocyanate, polyether polyol, portland cement, basalt, phosphoglyceride and a dehumidifying agent. The polyurethane material obtained by the reaction of the polyether polyol of the MN450 system and the polyisocyanate has the advantages of high strength, excellent mechanical property, wear resistance, high-temperature stability, low-temperature crack resistance, ultraviolet resistance and the like which are far higher than those of the existing steel bridge deck pavement material.
Description
Technical Field
The invention belongs to the field of novel concrete, and particularly relates to polyurethane concrete for paving a steel bridge deck in a seasonal freezing region, which is long in setting time and good in construction workability, and a preparation method thereof.
Background
The polyurethane concrete is a novel polyurethane concrete material which is formed by base materials such as polyurethane, cement, an additive, graded broken stones and the like according to a certain mixing ratio and is not used for a steel bridge deck pavement layer in a freezing region in a large area. The steel bridge deck pavement layer material is laid on a bridge steel panel, and has the main functions of preventing the bridge panel from being directly stressed, diffusing wheel load, avoiding direct contact abrasion, providing a smooth and anti-skid running surface for a vehicle, and protecting a main beam from being corroded by media such as rain, snow, deicing chloride and the like.
The mechanical property, high-temperature stability, low-temperature bending resistance, fatigue resistance, wear resistance and ageing resistance of the novel polyurethane concrete material pavement are far superior to those of the existing asphalt concrete pavement, SMA pavement and epoxy resin asphalt concrete pavement, but the novel polyurethane concrete material pavement is not widely popularized and applied to pavement of steel bridge floors so far, one of the most important reasons is that the initial setting time of the polyurethane concrete material before the performance is not optimized is too short, only a few minutes exist, the polyurethane concrete material is basically set within 30 minutes generally, great inconvenience is brought to construction, construction processes such as stirring, discharging, paving and the like cannot be completed within the short time, and even serious accidents that the material is set in a stirring tank without being discharged can be caused. It is also important to determine how to determine the initial setting time and the final setting time of the polyurethane concrete to guide the construction, and patent CN112161896 of the present invention determines the quality of workability from the displacement-force curve under the temperature condition corresponding to the viscosity of 0.35mpa.s, but does not indicate how to determine the initial setting time and the final setting time. Therefore, how to solve the problem that the setting time of the polyurethane concrete is too short and how to judge the initial setting time and the final setting time of the polyurethane concrete are technical problems to be solved urgently.
Disclosure of Invention
The invention aims to solve the technical problems of short setting time and poor workability of the existing polyurethane concrete, and provides the polyurethane concrete for paving the steel bridge deck in the seasonal frozen region and the preparation method thereof, wherein the polyurethane concrete has long setting time and good construction workability.
The polyurethane concrete for paving the steel bridge deck in the seasonal frozen region, which has long setting time and good construction workability, is prepared from isocyanate, polyether polyol, portland cement, basalt, phosphoglyceride and a dehumidifying agent; wherein the mass ratio of the isocyanate to the polyether polyol is 1: (0.8-1.2), wherein the mass ratio of the isocyanate to the portland cement is 1: (1.8-2.2), wherein the mass ratio of the isocyanate to the basalt is 1: (2.8-3.2), wherein the mass ratio of the isocyanate to the phosphoglyceride is (0.8-1.2): 0.01, wherein the mass ratio of the isocyanate to the dehumidifying agent is (0.8-1.2): 0.15.
further defined, the isocyanate to polyether polyol mass ratio is 1: 1, the mass ratio of the isocyanate to the portland cement is 1: 2, the mass ratio of the isocyanate to the basalt is 1: 3, the mass ratio of the isocyanate to the phosphoglyceride is 1: 0.01, wherein the mass ratio of the isocyanate to the dehumidifying agent is 1: 0.15.
further limited, the content of isocyanate in the isocyanate is 30.5-32%.
Further defined, the polyether polyol has a hydroxyl value of from 440mgKOH/g to 460 mgKOH/g.
Further limiting, the basalt is formed by mixing two kinds of basalt with different grain sizes to form a suspension compact structure.
Further limiting, the particle sizes of the two kinds of basalt with different particle sizes are respectively 4.75 mm-5 mm and 2.36 mm-3 mm.
Further defined, the desiccant is a solid silicone.
Further limiting, the water content of the isocyanate, the polyether glycol, the portland cement, the basalt, the phosphoglyceride and the dehumidifying agent is less than or equal to 0.05 percent.
The preparation method of the polyurethane concrete for paving the steel bridge deck in the frozen season region, which has long setting time and good construction workability, is carried out according to the following steps:
step 1: placing polyether polyol, a dehumidifying agent and phosphoglyceride into a dispersion machine for premixing, and standing until air bubbles are removed after premixing to obtain a primary mixed material;
step 2: when the temperature of the initially mixed material is reduced to 18-22 ℃, adding Portland cement and isocyanate, and continuously stirring and mixing to obtain a polyurethane cement mixed material;
and step 3: and after the two kinds of basalt with different particle sizes are mixed uniformly in advance, adding the polyurethane cement mixed material into the basalt mixed uniformly in advance, and continuously stirring and mixing to obtain the polyurethane concrete for paving the steel bridge deck in the seasonal freezing region, which has long setting time and good construction workability.
Further defined, the premixing in the step 1 is completed by stirring and mixing for 3min to 5min at 1500 +/-500 rpm.
And (3) further limiting, adding the Portland cement and the isocyanate when the temperature of the initial stirring material is reduced to 20 ℃ in the step 2, and continuously stirring and mixing at 1500 +/-500 rpm for 3-5 min.
Further, in the step 3, the stirring is carried out for 2min to 4min under the condition of not higher than 100 rpm.
The polyurethane concrete for paving the steel bridge deck in the freezing region has the advantages of long setting time and good construction workability, the construction temperature range is 15-25 ℃, the relative environment humidity is less than or equal to 75%, the water content of all materials is less than or equal to 0.05%, the steel bridge deck plate needs to be dried and cleaned, and the cleanliness and the roughness meet the steel bridge deck pavement design and construction technical specifications.
Compared with the prior art, the invention has the advantages that:
1) the polyurethane concrete which has long setting time and excellent workability and is suitable for paving the steel bridge deck in the seasonal frozen region is prepared by reasonably selecting materials and reasonably proportioning, and the polyurethane material obtained by reacting the polyether polyol of the MN450 system and the polyisocyanate selected by the invention has the advantages of high strength, excellent mechanical property, wear resistance, high-temperature stability, low-temperature crack resistance, ultraviolet resistance and the like which are far higher than those of the existing steel bridge deck paving material. The setting time is obviously prolonged by adding the phosphoglyceride, the initial setting time is as long as 140min and the final setting time is as long as 230min under the condition of the adding amount of the phosphoglyceride, the compression strength and the breaking strength of the phosphoglyceride are ensured to be excellent, the 7d compression strength is as high as 88.4MPa, the 7d breaking strength is as high as 24.9MPa, the respective strength is more than 90% of that of the phosphoglyceride when the phosphoglyceride is not added, the comprehensive performance is excellent, if the adding amount of the phosphoglyceride is too much or too little, the setting time can be reduced, and the strength can not meet the use requirement.
2) The invention strictly controls the temperature and the rotating speed of materials to control the reaction speed and the curing speed so as to achieve the optimal workability and the setting time of polyurethane concrete, the environment temperature and the material temperature which are developed by the invention and have long setting time and excellent workability and are suitable for preparing the polyurethane concrete paved on the steel bridge deck in the seasonal freezing area are 15-25 ℃, if the temperature is too low, the polyether polyol and the polyisocyanate can not be fully polymerized, the material performance is influenced, if the temperature is too high, the reaction of the polyether polyol and the polyisocyanate can be aggravated, meanwhile, the curing speed is accelerated, the setting time is shortened, and the invention is not beneficial to paving construction of the steel bridge deck.
3) Because the viscosity of phosphoglyceride is very big, 3000 ~ 8000mpa.s, need high-speed dispersion just can carry out the homogeneous mixing with polyether polyol, in addition because polyurethane concrete material is extremely sensitive to water in the forming process, it is swelling to meet water, consequently need add the dehumidizer and remove the trace moisture in polyether polyol and the cement, and the dehumidizer presents powdered, just can be even, fully with the mixture equally need high-speed dispersion, through the experiment demonstration, when the stirring rate of dispenser is 1500 + -500 revolutions per minute, for best stirring rate, it is insufficient that low then can lead to the material stirring, too high then can lead to material intensification aggravation reaction rate because of friction stir.
Drawings
FIG. 1 is a graph of the through-man resistance versus time for the polyurethane concrete of comparative example 1;
FIG. 2 is a graph of the through-man resistance versus time for the polyurethane concretes of example 1 and comparative examples 1-2; curve 1-example 1, curve 2-no addition of phosphoglyceride, curve 3-addition of 0.5% phosphoglyceride, curve 4-addition of 2% phosphoglyceride, curve 5-addition of 3% phosphoglyceride, curve 6-addition of 4% phosphoglyceride;
FIG. 3 is a graph of the through-man resistance versus time for the polyurethane concrete of comparative example 1 and comparative example 3; curve 1-without phosphoglyceride, curve 2-with 5% castor oil, curve 3-with 10% castor oil, curve 4-with 15% castor oil, curve 5-with 20% castor oil;
FIG. 4 is a field photograph of slump test;
FIG. 5 is a graph of slump as a function of time for the polyurethane concrete of example 1;
FIG. 6 is a graph showing the reaction temperature of the polyurethane concrete of comparative example 1 as a function of time;
FIG. 7 is a graph showing the reaction temperature of the polyurethane concrete of example 1 as a function of time.
Detailed Description
Example 1: the polyurethane concrete for paving the steel bridge deck in the seasonal freezing region, which is long in setting time and good in workability, is prepared from isocyanate, polyether polyol MN450, P.O.42.5 portland cement, primary basalt, phosphoglyceride and a desiccant solid organic silicon; wherein the mass ratio of the isocyanate to the polyether polyol MN450 is 1: 1, the mass ratio of the isocyanate to the P.O.42.5 Portland cement is 1: 2, the mass ratio of the isocyanate to the primary basalt is 1: 3, the mass ratio of the isocyanate to the phosphoglyceride is 1: 0.01, wherein the mass ratio of the isocyanate to the dehumidifying agent solid organosilicon is 1: 0.15;
wherein the physical and chemical indexes of the materials are as follows:
TABLE 1 physical and chemical indexes of isocyanates
TABLE 2 physical and chemical indexes of polyether polyol MN450
TABLE 3 solid organosilicon physicochemical index of desiccant
The portland cement is swan brand ordinary portland cement P.O 42.5.5 produced by Harbin Aditai cement Co., Ltd, the cement is required to meet the factory index, and the newly factory cement is ensured, so that the water content of the cement meets the requirement of less than or equal to 0.05%.
The basalt adopts the first-grade basalt of a Harbin Archeng quarry, the rock index meets the factory requirement, and in addition, the important point is that the moisture content of the rock is less than or equal to 0.05 percent, so if the rock is wet before construction, the stone is required to be dried, and the moisture content is less than or equal to 0.05 percent.
The basalt is formed by mixing two kinds of basalt with different grain sizes, the grain sizes of the two kinds of basalt with different grain sizes are 4.75mm and 2.36mm respectively, the mass ratio of the basalt with the grain size of 4.75mm to isocyanate is 1.92:1, and the mass ratio of the basalt with the grain size of 2.36mm to isocyanate is 1.08: 1;
the dehumidifying agent is solid organic silicon and white powder, and has the functions of removing trace water molecules in polyether polyol, deeply absorbing water and eliminating bubbles;
the solid content of the phosphoglyceride is more than or equal to 98 percent, the water content is less than or equal to 1 percent, the viscosity is 3000-;
the process for the preparation of the polyurethane concrete described in example 1 was carried out as follows:
step 1: premixing polyether polyol MN450, desiccant solid organic silicon and phosphoglyceride, wherein the stirring speed of a disperser is 1500rpm during premixing, stirring and mixing for 3min, and standing until bubbles are removed to obtain a primary mixed material;
step 2: when the temperature of the initially mixed material is reduced to 20 ℃, adding P.O.42.5 Portland cement and isocyanate, and continuously stirring and mixing at 1500rpm for 3min to obtain a polyurethane cement mixed material;
and step 3: and (3) uniformly mixing the primary basalt with the particle sizes of 4.75mm and 2.36mm in advance, adding the mixture into a polyurethane cement mixed material, and stirring and mixing for 3min under the condition of not higher than 100rpm to obtain the polyurethane concrete for paving the steel bridge deck in the seasonal freezing region, which has long setting time and good construction workability.
Comparative example 1: this example differs from example 1 in that: no phosphoglyceride was added. Other steps and parameters are the same as those of the embodiment.
Comparative example 2: this example differs from example 1 in that: the mass ratio of the phosphoglyceride to the isocyanate is 1: 0.005, 1: 0.02, 1:0.03 and 1: 0.04. Other steps and parameters are the same as those of the embodiment.
Comparative example 3: this example differs from example 1 in that: castor oil is used for replacing phosphoglyceride, and the mass ratio of the castor oil to isocyanate is 1: 0.05, 1:0.1, 1:0.15 and 1: 0.2. Other steps and parameters are the same as those of the embodiment.
Coagulation time determination test and results:
first, penetration resistance test
1) Placing the test piece on a through-man resistance meter base, and recording the total mass of the polyurethane concrete and the container displayed on the dial;
2) and selecting a proper measuring needle according to the through-human resistance of the sample. Generally, when micro cracks appear at the hole measuring edge of the surface of the polyurethane concrete, a measuring needle with a smaller cross section area is immediately changed, such as a surface;
TABLE 4 reference for use with the stylus
| Penetration resistance per unit area (MPa) | 0.2-3.5 | 3.5-20 | 20-28 |
| Flat head measuring probe circle area (mm)2) | 100 | 50 | 20 |
3) Firstly, the end face of the measuring needle is just contacted with the surface of mortar, then the hand wheel is rotated, the measuring needle is vertically and uniformly inserted into a test sample within 10s +2s, the depth is 25mm and 2mm, and the increment displayed by the dial scale is recorded, and the accuracy is 10N. The time elapsed since mixing was recorded (to the nearest 1min) and the ambient temperature (to the nearest 0.5C). During measurement, the distance between the measuring probe and the edge of the test mold is at least 25mm, and the clear distance between each point of the mortar penetrated by the measuring probe is at least two times of the diameter of the measuring probe and is not less than 15 mm. And (4) measuring 1-2 points of each time of the three test molds, and taking the arithmetic average value of the three test molds as the penetration resistance value of the time. The per-sample per-pass resistance test should be between 0.2MPa and 28MPa, and not less than six times, and the per-unit-area per-pass resistance of the last time should be not less than 28 MPa. The measurement was performed every two minutes from the end of the mixing.
4) The penetration resistance per unit area was calculated as follows:
fPR＝P/A
wherein, P is the penetration pressure (N) when the penetration depth of the measuring needle is 25 mm;
a-area of the cross section of the penetration probe (mm)2)；
And drawing a relation curve between the human-through resistance in unit area and the test time by taking the human-through resistance in unit area as a vertical coordinate and the test time as a horizontal coordinate, and drawing two straight lines parallel to the horizontal coordinate through 3.5MPa and 28MPa according to the test regulations of highway engineering cement and cement concrete, wherein the intersection points of the straight lines and the horizontal coordinate of the curve are the initial setting time and the final setting time. The verification proves that the surface of the polyurethane concrete begins to lose plastic deformation when the strength reaches 3.5Mpa, the temperature rise amplitude of the test piece begins to become slow, the initial setting standard can be positioned, the surface of the polyurethane concrete completely loses plastic deformation when the strength reaches 28Mpa, and the final setting standard can be positioned.
As a result: (1) comparative example 1 the curve of the relationship between the man-through resistance and the time of the polyurethane concrete without adding phosphate is shown in fig. 1, and it can be seen from the curve that the initial setting time is about 35min and the final setting time is about 70min under the standard room temperature without adding phosphate; (2) the relationship curve between the man-through resistance and the time of the polyurethane concrete of example 1 and comparative examples 1-2 is shown in fig. 2, and it can be seen from the curve that, at the standard test temperature, different dosages of phosphate are added, the retardation effect is best when 1% of phosphate is added, the initial setting time is 140min when the content of phosphate is 1%, the final setting time is 230min, and the setting time is reduced along with the increase or decrease of the content of phosphate; (3) the curves of the polyurethane concrete of comparative example 1 and comparative example 3 showing the relationship between the through resistance and the time are shown in fig. 3, the retardation effect is the best when the content of castor oil is 5%, the initial setting time is 45min, the final setting time is 90min, and the setting time is only about one third of the setting time of the phosphate added in the invention. (4) The results of the 7d strength of the polyurethane concrete are shown in Table 5. from Table 5, it can be seen that the concrete of example 1 has the best retardation effect, and the compressive strength and the flexural strength are slightly reduced, but the strength of the concrete can be maintained to be more than 90% of the strength of the concrete without phosphate ester. The initial setting time can reach 140min, and the final setting time can reach 230 min.
TABLE 5 7d Strength of polyurethane concretes
Second, slump test
The mixed polyurethane concrete is loaded into a cylinder in three layers, the loading height of each layer is slightly larger than one third of the height of the cylinder, a tamping rod is used for uniformly inserting and tamping on the cross section of each layer for 25 times, the inserting and tamping are carried out on the whole area, the bottom layer is inserted to the bottom when the bottom layer is inserted and tamped from the edge to the center along a spiral line, the bottom layer is inserted to the bottom when the other two layers are inserted and tamped, the bottom layer is inserted to be 20-30 mm through the layer, and the inserting and tamping needs to be vertically pressed down (except the edge part), so that the polyurethane concrete cannot be impacted. When the top layer is inserted and tamped, the concrete filled in the top layer is higher than the opening of the slump cone, and the mixture is added at any time along with the inserting and tamping process. After the top layer is inserted and tamped, the tamping rod is sawn and rolled to remove redundant concrete, a trowel is used for smoothing the opening of the barrel, and the mixture around the bottom is scraped. And then, the slump cone is immediately and vertically lifted, the lifting of the slump cone is finished within 5-10 s, and the concrete is not influenced by transverse and torsion forces. The whole process from the start of charging to the work out of slump should be completed within 120 s. And (3) placing the slump cone on one side of the cone concrete sample, flatly placing the wood ruler on the simple top, and measuring the vertical distance from the bottom surface of the wood ruler to the highest point of the sample top surface by using a small steel ruler, namely the slump of the concrete mixture, wherein the slump is accurate to 1 mm. When one side of the concrete sample collapses or is sheared and damaged, the sample is taken again for another measurement. If this still occurs for the second time, it is an indication that the workability of the concrete is not good and should be recorded. The photograph in situ is shown in FIG. 4, the graph of slump change with time is shown in FIG. 5, and the slump result is shown in Table 6, which shows that the average slump value of the polyurethane concrete of this compounding ratio is 125 mm when no phosphate is added, similarly to the plastic concrete. After the phosphate is added, the change trend of the slump along with the pouring forming time is in four stages, namely a liquid state in 0-45 minutes, a plastic state in 45-90 minutes, a low plastic state in 90-135 minutes and a dry and thick state in more than 135 minutes. The relation curve of the slump and the pouring time can be obtained, in order to facilitate construction, construction should be carried out at the stage that the material presents plasticity, namely if phosphate is not added, the construction processes such as stirring, discharging, paving and the like should be completed within 10 minutes, if a retardant is added, the whole construction process can be completed within 90 minutes, the construction time is sufficient, and the required construction time is met.
TABLE 6 slump test results
Third, testing the reaction temperature of the materials
The polyurethane concrete material is a high polymer material, the temperature change in the reaction process directly reacts the intensity of the chemical reaction in the material, generally, the temperature is increased smoothly, which means that the reaction is smooth, and the setting time is increased slowly; if the temperature rises suddenly, the reaction is severe, and the coagulation time suddenly becomes fast and short. It is extremely important to monitor the temperature change of the polyurethane concrete material from the completion of casting to before curing. The temperature measurements were performed using an insertion thermometer and the results are shown in FIGS. 6-7. As can be seen from the graph, it can be seen from the curve of the change of the material reaction temperature with time that the temperature of the polyurethane concrete material without phosphate ester reaches the highest point at 30 minutes and is 64.8 ℃, the temperature gradually decreases when the reaction is most severe, the temperature of the polyurethane concrete material with phosphate ester reaches the highest point at 90 minutes and is 30.1 ℃, the temperature gradually decreases when the reaction is most severe, that is, the initial setting time of the polyurethane concrete without phosphate ester is 30 minutes, and the initial setting time of the polyurethane concrete with phosphate ester is 90 minutes.
In summary, from the construction perspective, the workability of construction cannot be determined only from one factor of penetration resistance, slump, temperature and the like, and the initial setting time and the final setting time of the polyurethane concrete need to be comprehensively determined by combining three factors, and the concrete formula is reasonably designed according to the workability of construction to meet the construction requirement.
Claims (10)
1. The polyurethane concrete for paving the steel bridge deck in the seasonal freezing region is long in setting time and good in construction workability, and is characterized by being prepared from isocyanate, polyether polyol, portland cement, basalt, glycerol phosphate and a dehumidifying agent; wherein the mass ratio of the isocyanate to the polyether polyol is 1: (0.8-1.2), wherein the mass ratio of the isocyanate to the portland cement is 1: (1.8-2.2), wherein the mass ratio of the isocyanate to the basalt is 1: (2.8-3.2), wherein the mass ratio of the isocyanate to the phosphoglyceride is (0.8-1.2): 0.01, wherein the mass ratio of the isocyanate to the dehumidifying agent is (0.8-1.2): 0.15.
2. the polyurethane concrete for paving steel bridge decks in seasonal frozen regions, which has long setting time and good workability in construction, according to claim 1, wherein the mass ratio of the isocyanate to the polyether polyol is 1: 1, the mass ratio of the isocyanate to the portland cement is 1: 2, the mass ratio of the isocyanate to the basalt is 1: 3, the mass ratio of the isocyanate to the phosphoglyceride is 1: 0.01, wherein the mass ratio of the isocyanate to the dehumidifying agent is 1: 0.15.
3. the polyurethane concrete for paving steel bridge decks in seasonal frozen regions, which has long setting time and good workability, according to claim 1, wherein the isocyanate content is 30.5 to 32 percent, and the hydroxyl value of the polyether polyol is 440 to 460 mgKOH/g.
4. The polyurethane concrete for paving steel bridge decks in seasonal frozen regions, which has long setting time and good workability in construction, according to claim 1, wherein the basalt is a suspension compact structure formed by mixing two kinds of basalt with different particle sizes.
5. The polyurethane concrete for paving steel bridge decks in seasonal frozen regions, which has long setting time and good workability, according to claim 4, wherein the two kinds of basalt with different particle sizes have particle sizes of 4.75mm to 5mm and 2.36mm to 3mm, respectively.
6. The polyurethane concrete for paving steel bridge decks in seasonal frozen regions, which has long setting time and good construction workability, as claimed in claim 1, is characterized in that the dehumidifying agent is solid organosilicon, and the moisture contents of the isocyanate, the polyether polyol, the portland cement, the basalt, the glycerol phosphate and the dehumidifying agent are all less than or equal to 0.05%.
7. The method for preparing the polyurethane concrete for paving the steel bridge deck in the seasonal frozen region, which has long setting time and good construction workability as claimed in any one of claims 1 to 6, is characterized by comprising the following steps:
step 1: placing polyether polyol, a dehumidifying agent and phosphoglyceride into a dispersion machine for premixing, and standing until air bubbles are removed after premixing to obtain a primary mixed material;
step 2: when the temperature of the initially mixed material is reduced to 18-22 ℃, adding Portland cement and isocyanate, and continuously stirring and mixing to obtain a polyurethane cement mixed material;
and step 3: and after the two kinds of basalt with different particle sizes are mixed uniformly in advance, adding the polyurethane cement mixed material into the basalt mixed uniformly in advance, and continuously stirring and mixing to obtain the polyurethane concrete for paving the steel bridge deck in the seasonal freezing region, which has long setting time and good construction workability.
8. The method for preparing the polyurethane concrete for paving the steel bridge deck in the permafrost region, which has the advantages of long setting time and good workability according to claim 7, wherein the premixing in the step 1 is completed by stirring and mixing at 1500 +/-500 rpm for 3-5 min.
9. The method for preparing the polyurethane concrete for paving the steel bridge deck in the seasonal frozen region, which has the advantages of long setting time and good construction workability, as claimed in claim 7, wherein in the step 2, when the temperature of the initial mixing material is reduced to 20 ℃, the portland cement and the isocyanate are added, and the stirring and mixing are continued at 1500 +/-500 rpm for 3-5 min.
10. The method for preparing the polyurethane concrete for paving the steel bridge deck in the permafrost region, which has the advantages of long setting time and good workability according to claim 7, wherein the stirring in the step 3 is performed for 2-4 min under the condition of not higher than 100 rpm.
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4554300A (en) * | 1985-04-12 | 1985-11-19 | Goodyear Aerospace Corporation | Reducing the speed of aliphatic diamine curing agents in polyurethane cements |
| US4582861A (en) * | 1984-11-13 | 1986-04-15 | Air Products And Chemicals, Inc. | Delayed action/enhanced curing catalysis in polyurethane systems |
| US4783220A (en) * | 1986-12-18 | 1988-11-08 | Xerox Corporation | Vesicle ink compositions |
| US20030090016A1 (en) * | 2001-08-13 | 2003-05-15 | Zoran Petrovic | Polymer concrete and method for preparation thereof |
| WO2011094244A1 (en) * | 2010-01-27 | 2011-08-04 | Dow Global Technologies Llc | Delayed action polyurethane catalyst |
| DE102010060390A1 (en) * | 2010-11-05 | 2012-05-10 | Bayer Materialscience Aktiengesellschaft | Emulsion-shaped reaction mixture and process for producing polyurethane foams from such a reaction mixture |
| CN106432674A (en) * | 2015-08-11 | 2017-02-22 | 王娟 | Waterborne polyurethane emulsion |
| CN112143018A (en) * | 2020-10-12 | 2020-12-29 | 南京摩开科技有限公司 | Anti-fog polyurethane film and preparation method thereof |
-
2021
- 2021-06-29 CN CN202110728080.2A patent/CN113387651B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4582861A (en) * | 1984-11-13 | 1986-04-15 | Air Products And Chemicals, Inc. | Delayed action/enhanced curing catalysis in polyurethane systems |
| US4554300A (en) * | 1985-04-12 | 1985-11-19 | Goodyear Aerospace Corporation | Reducing the speed of aliphatic diamine curing agents in polyurethane cements |
| US4783220A (en) * | 1986-12-18 | 1988-11-08 | Xerox Corporation | Vesicle ink compositions |
| US20030090016A1 (en) * | 2001-08-13 | 2003-05-15 | Zoran Petrovic | Polymer concrete and method for preparation thereof |
| WO2011094244A1 (en) * | 2010-01-27 | 2011-08-04 | Dow Global Technologies Llc | Delayed action polyurethane catalyst |
| DE102010060390A1 (en) * | 2010-11-05 | 2012-05-10 | Bayer Materialscience Aktiengesellschaft | Emulsion-shaped reaction mixture and process for producing polyurethane foams from such a reaction mixture |
| CN106432674A (en) * | 2015-08-11 | 2017-02-22 | 王娟 | Waterborne polyurethane emulsion |
| CN112143018A (en) * | 2020-10-12 | 2020-12-29 | 南京摩开科技有限公司 | Anti-fog polyurethane film and preparation method thereof |
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