CN113046086B - Formula and preparation method for adjusting humidity of super absorbent resin modified loess roadbed - Google Patents
Formula and preparation method for adjusting humidity of super absorbent resin modified loess roadbed Download PDFInfo
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- CN113046086B CN113046086B CN202110265851.9A CN202110265851A CN113046086B CN 113046086 B CN113046086 B CN 113046086B CN 202110265851 A CN202110265851 A CN 202110265851A CN 113046086 B CN113046086 B CN 113046086B
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Abstract
The invention discloses a formula and a preparation method for adjusting the humidity of a super absorbent resin modified loess subgrade, belongs to the technical field of road subgrade construction, and can solve the problems that the mechanical strength of the subgrade is reduced and the engineering properties are degraded due to the fact that the local soil body is humidified and dehumidified due to water migration in the loess subgrade. Super absorbent resin: the mass ratio of water is 200: (0-4): (23-45), a humidity field self-adjusting system is formed inside the loess subgrade, and the relative stability of the loess subgrade is maintained. The super absorbent resin used in the invention has low cost, is environment-friendly and pollution-free, can be repeatedly used, and is beneficial to large-area popularization; the proportion and the preparation method can improve the water stability of the loess subgrade and effectively adjust the humidity of the loess subgrade.
Description
Technical Field
The invention belongs to the technical field of road subgrade construction, and particularly relates to a formula and a preparation method for adjusting the humidity of a super absorbent resin modified loess subgrade.
Background
Loess is very sensitive to water due to large porosity and poor airtightness, so that the mechanical strength of a roadbed is reduced due to the local humidifying and dehumidifying action of a soil body caused by water migration, the engineering property is degraded, and disasters are caused by serious people. The current research suggests that: the moisture content is an important factor affecting the strength and deformation of loess. Therefore, loess is problematic soil and presents a great challenge to people when it is applied to fill a roadbed.
The conventional method for curing the loess subgrade represented by gypsum and cement has high cost and resource waste, and the moisture content of the loess subgrade cannot be reduced fundamentally. Therefore, from the moisture content angle of loess road bed, it is necessary to look for a material that can self-interacting loess road bed humidity state, improves the sensitivity of loess road bed to moisture, adjusts the moisture content of loess road bed, improves the adaptability of loess road bed to moisture, maintains humidity field relative stability in the loess road bed, ensures the stability of road bed mechanical properties.
Disclosure of Invention
The invention provides a formula for adjusting the humidity of a super absorbent resin modified loess subgrade and a preparation method thereof, aiming at the problems that the mechanical strength of the subgrade is reduced and the engineering property is degraded due to the local humidification and dehumidification of soil body caused by the water migration in the loess subgrade. The roadbed is formed by uniformly mixing the roadbed with loess and then uniformly compacting the loess by adding water, has good water stability, higher dynamic resilience modulus, simple and easy construction and low cost, saves the engineering investment, simultaneously takes account of environmental protection, and has good ecological benefit and social benefit.
The invention adopts the following technical scheme:
a formula for adjusting the humidity of a super absorbent resin modified loess roadbed comprises the following components in parts by weight: 200 parts of loess, 1-4 parts of super absorbent resin and 23-45 parts of water.
Further, a formula for adjusting the humidity of the super absorbent resin modified loess subgrade comprises the following components in parts by weight: 200 parts of loess, 1 part of super absorbent resin and 34 parts of water.
The loess is low liquid limit Clay (CL), the particle size is less than 5mm, the natural water content w is 13-17%, and the liquid limit w is123 to 30 percent of plastic limit wp15-20% of plastic index IpIs 10, liquidity index IlLess than 0, and the maximum dry density of 1.7-1.92 g/cm3The optimal water content is 17-21%.
The super absorbent resin comprises sodium polyacrylate with particle size of 30-400 meshes and 0.037-0.6 mm, and has water absorption capacity of 52-57 g/g in 0.9% saline of 0.7PsiThe pressurized absorption capacity is 14-18 g/g, the centrifugal water retention capacity is 30-33 g/g, the physiological saline absorption rate is 14-30 s, and the bulk density is 0.64-0.84 g/cm3The pH value is 6.2, the water absorption is hydrogel, and the water absorption and release can be repeated in the loess subgrade with stable quality.
The water is municipal tap water.
A preparation method of a formula for adjusting the humidity of a super absorbent resin modified loess roadbed comprises the following steps:
manually mixing loess and super absorbent resin according to a proportion for 10min under the environment that the temperature is 10-18 ℃ and the relative humidity is 45-55%, adding water, continuously mixing for 15min, fully kneading to uniformly mix, and standing the obtained mixture for 1 day.
The invention has the following beneficial effects:
the main raw material super absorbent resin used in the formula of the invention is a novel functional polymer material integrating water absorption, water retention and slow release, contains a large number of strong hydrophilic functional groups (such as carboxyl, hydroxyl, carboxylate group, acyl and the like), has a certain three-dimensional cross-linked network structure, can absorb water which is hundreds of times or even thousands of times of the self weight, but is insoluble in water, has strong water retention capacity, and is insoluble in conventional organic solvents. The main component is sodium polyacrylate with the particle size of 200-400 meshes, the cost is low, the environment is friendly, no pollution is caused, the sodium polyacrylate can be repeatedly used, and large-area popularization is facilitated.
The moisture-adjusting loess subgrade disclosed by the invention utilizes the good water absorption, water retention and slow-release performance of the super absorbent resin to form a 'micro reservoir' in the loess subgrade, so that the 'micro reservoir' has the repeated circulation of water absorption, water shortage and water release ', water absorption in rainy season and water release in dry season', the sensitivity of the loess subgrade to water is improved, and the anti-erosion, anti-disintegration and water stability performances of soil particles are enhanced; adjust the moisture content of loess road bed, improve the adaptability of loess road bed to moisture, maintain humidity field relative stability in the loess road bed to guarantee the stability of road bed mechanical properties. The loess subgrade structure is easy to construct, has certain theoretical significance and engineering value for guaranteeing the construction safety of highway engineering and protecting the ecological environment, and has wide application prospect.
Drawings
FIG. 1 is a comparison chart of a super absorbent resin before and after water absorption, wherein (a) and (b) are a comparison chart of a super absorbent resin with 30-80 meshes before and after water absorption, and (c) and (d) are a comparison chart of a super absorbent resin with 200-400 meshes before and after water absorption;
FIG. 2 is a graph showing the maximum dry density and the optimum water content as a function of the amount of the super absorbent resin;
FIG. 3 is a graph showing the change of the volume water content of loess with time under different amounts of super absorbent resin;
FIG. 4 is a graph showing the predicted value of modified loess modulus of elasticity by super absorbent resin.
Detailed Description
The invention relates to a proportion and a preparation method for adjusting the humidity of a super absorbent resin modified loess roadbed, which comprises the following raw materials of loess, super absorbent resin and water in a weight proportion, wherein 200 parts of the loess, 1-4 parts of the super absorbent resin and 23-45 parts of the water are implemented in an environment with the temperature of 10-18 ℃ and the relative humidity of 45-55%. The following will describe in detail embodiments of the present invention.
Example 1
The composite material comprises the following raw materials in parts by weight: 200 parts of loess, 1 part of 200-400-mesh super absorbent resin and 26-43 parts of water.
The method comprises the steps of manually mixing loess and super absorbent resin according to a designed proportion for 10min at the temperature of 10-18 ℃ and under the environment with the relative humidity of 45-55%, adding a proper amount of water, continuing mixing for 15min, fully kneading to uniformly mix the loess, the super absorbent resin and the water, sealing one part of the loess, the super absorbent resin and the water after uniformly mixing, monitoring the change of the volume water content of a mixture in a closed system, sealing the other part of the loess, the super absorbent resin and the water, standing for 24h, performing compaction test, and predicting the dynamic resilience modulus of a mixed soil sample.
Example 2
The composite material comprises the following raw materials in parts by weight: 200 parts of loess, 1.5 parts of 200-400 mesh super absorbent resin and 27-44 parts of water.
The method comprises the steps of manually mixing loess and super absorbent resin according to a designed proportion for 10min at the temperature of 10-18 ℃ and under the environment with the relative humidity of 45-55%, adding a proper amount of water, continuing mixing for 15min, fully kneading to uniformly mix the loess, the super absorbent resin and the water, sealing one part of the loess, the super absorbent resin and the water after uniformly mixing, monitoring the change of the volume water content of a mixture in a closed system, sealing the other part of the loess, the super absorbent resin and the water, standing for 24h, performing compaction test, and predicting the dynamic resilience modulus of a mixed soil sample.
Example 3
The composite material comprises the following raw materials in parts by weight: 200 parts of loess, 2 parts of 200-400-mesh super absorbent resin and 28-45 parts of water.
The method comprises the steps of manually mixing loess and super absorbent resin according to a designed proportion for 10min at the temperature of 10-18 ℃ and under the environment with the relative humidity of 45-55%, adding a proper amount of water, continuing mixing for 15min, fully kneading to uniformly mix the loess, the super absorbent resin and the water, sealing one part of the loess, the super absorbent resin and the water after uniformly mixing, monitoring the change of the volume water content of a mixture in a closed system, sealing the other part of the loess, the super absorbent resin and the water, standing for 24h, performing compaction test, and predicting the dynamic resilience modulus of a mixed soil sample.
Example 4
The composite material comprises the following raw materials in parts by weight: 200 parts of loess, 1 part of 30-80 mesh super absorbent resin and 23-39 parts of water.
The method comprises the steps of manually mixing loess and super absorbent resin according to a designed proportion for 10min at the temperature of 10-18 ℃ and under the environment with the relative humidity of 45-55%, adding a proper amount of water, continuing mixing for 15min, fully kneading to uniformly mix the loess, the super absorbent resin and the water, sealing one part of the loess, the super absorbent resin and the water after uniformly mixing, monitoring the change of the volume water content of a mixture in a closed system, sealing the other part of the loess, the super absorbent resin and the water, standing for 24h, performing compaction test, and predicting the dynamic resilience modulus of a mixed soil sample.
Control group
The composite material comprises the following raw materials in parts by weight: 200 parts of loess, 23-39 parts of non-super absorbent resin and water.
Adding a proper amount of water into 200 parts of loess at the temperature of 10-18 ℃ and under the environment with the relative humidity of 45-55%, stirring for 15min, fully kneading to mix uniformly, sealing one part of the mixture after uniformly stirring, monitoring the change of the volume water content of the mixture in a closed system, sealing the other part of the mixture, standing for 24h, performing compaction test, and predicting the dynamic resilience modulus of the mixed soil sample.
The following steps of monitoring the water content in the closed system, performing compaction tests and predicting the modulus of resilience in the closed system are performed in examples 1 to 4 and comparative examples:
1. compaction characteristics
Referring to JTG 34300-. The results are shown in Table 1.
TABLE 1
According to table 1, in an appropriate range, along with the increase of the same amount of super absorbent resin, the maximum dry density of the improved loess is increased and then reduced, and the optimal water content is increased continuously, mainly because under the low amount of super absorbent resin, the particle size of the super absorbent resin is small, the pores inside the loess structure play a role in filling, and on the other hand, the super absorbent resin has certain viscosity after absorbing water, and can be cemented with the loess particles. At a high loading, the super absorbent resin will wrap the loess particles, and the cohesion of the mixture is reduced, resulting in a reduction in dry density.
When the particle size of the super absorbent resin is different, the impact properties of the modified loess are affected differently. When the mixing amount is proper, the maximum dry density is closer, and the optimum water content is slightly smaller when the mixed particle size is larger. This is because the particle diameter is large, the specific surface area is small, and the water absorption property of the resin is limited, and the optimum water content of the modified loess is small.
2. Water content of super absorbent resin modified loess
Through self-control testing arrangement, adopt its survey loess of humidity transducer, super absorbent resin and water mixture back closed system inside volume moisture content change, the test result is seen in table 2.
TABLE 2
According to table 2, the super absorbent resin has significant influence on the moisture content of the loess, and along with the increase of the mixing amount of the super absorbent resin, the moisture content of the loess is significantly less, which is derived from that the super absorbent resin is a novel functional polymer material, contains a large amount of strong hydrophilic functional groups (such as carboxyl, hydroxyl, carboxylate group, acyl and the like), has a certain three-dimensional cross-linked network structure, integrates water absorption, water retention and slow release into a whole, and has super-strong water absorption performance, so the super absorbent resin plays a significant beneficial role in adjusting the humidity of the loess subgrade.
3. Dynamic modulus of resilience prediction
The samples after the modified loess test were observed and subjected to the touch compaction test to find that the modified loess was soft and elastic, and therefore the dynamic resilience modulus of the samples after the modified super absorbent resin was predicted, and the prediction results are shown in table 3.
TABLE 3
As can be seen from table 3, the addition of the super absorbent resin increases the dynamic resilience modulus of the loess foundation, because the super absorbent resin has a certain three-dimensional cross-linked network structure, expands into gel after absorbing water, and is bonded with loess to form viscoelasticity, so that the dynamic resilience modulus of the loess foundation improved by the super absorbent resin is higher than that of pure loess.
Finally, it should be noted that: the above-mentioned embodiments are only specific embodiments of the present invention, which are used for illustrating the technical solutions of the present invention and not for limiting the same, and the protection scope of the present invention is not limited thereto, although the present invention is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: any person skilled in the art can modify or easily conceive the technical solutions described in the foregoing embodiments or equivalent substitutes for some technical features within the technical scope of the present disclosure; such modifications, changes or substitutions do not depart from the spirit and scope of the embodiments of the present invention, and they should be construed as being included therein. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (3)
1. A preparation method of a super absorbent resin modified loess subgrade humidity regulator is characterized by comprising the following steps: the composition comprises the following components in parts by weight: 200 parts of loess, 1-4 parts of super absorbent resin and 23-45 parts of water;
the super absorbent resin comprises sodium polyacrylate with the particle size of 30-400 meshes, the water absorption capacity of 52-57 g/g in 0.9% saline water and the water absorption capacity of 0.7PsiThe pressurized absorption capacity is 14-18 g/g, the centrifugal water retention capacity is 30-33 g/g, the physiological saline absorption rate is 14-30 s, and the bulk density is 0.64-0.84 g/cm3The pH value is 6.2, the water-absorbing material is hydrogel after absorbing water, and the water-absorbing material can absorb and release water repeatedly when the water-absorbing material is stable in the loess subgrade;
the loess is low liquid limit clay with particle size less than 5mm, natural water content w of 13-17%, and liquid limit w123 to 30 percent of plastic limit wp15-20% of plastic index IpIs 10, liquidity index IlLess than 0, maximum dry densityThe degree of the reaction is 1.7 to 1.92g/cm3The optimal water content is 17-21%;
the preparation method of the super absorbent resin modified loess subgrade humidity regulator comprises the following steps:
manually mixing loess and super absorbent resin according to a proportion for 10min under the environment that the temperature is 10-18 ℃ and the relative humidity is 45-55%, adding water, continuously mixing for 15min, fully kneading to uniformly mix, and standing the obtained mixture for 1 day.
2. The method for preparing a super absorbent resin modified loess subgrade humidity adjusting agent as claimed in claim 1, wherein: the composition comprises the following components in parts by weight: 200 parts of loess, 1 part of super absorbent resin and 34 parts of water.
3. The method for preparing a super absorbent resin modified loess subgrade humidity adjusting agent as claimed in claim 1, wherein: the water is municipal tap water.
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