CN112665976B - Design method for strength ratio of caustic sludge improved lime stabilized soil - Google Patents
Design method for strength ratio of caustic sludge improved lime stabilized soil Download PDFInfo
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Abstract
The invention discloses a strength proportion design method of caustic sludge improved lime stabilized soil, which comprises the following steps: (1) Sampling test materials of caustic sludge, lime and plain soil and testing natural water content; (2) Selecting a qualified lime soil proportioning scheme in the test road section as a reference group proportioning, and determining the proportioning scheme of each test group; (3) determining the optimal moisture content of each test group; (4) Preparing a test piece of unconfined compressive strength of the caustic sludge limestone soil; (5) And calculating the unconfined compressive strength of the soda residue lime stabilized soil test piece for 7 days, fitting the data, and predicting the optimal soda residue mixing amount of the soda residue lime soil according to the fitting result. According to the invention, a proper amount of caustic sludge is added on the basis of the original lime stabilized soil, the consolidation and plate body characteristics of the lime stabilized soil body are improved by utilizing the caustic sludge, the strength of the lime stabilized soil is improved, the caustic sludge lime stabilized soil has better engineering bearing capacity, and the recycling of the caustic sludge waste is realized.
Description
Technical Field
The invention relates to a road surface base material for road engineering, in particular to a design method for strength proportion of caustic sludge improved lime stabilized soil.
Background
Soda ash is an important industrial raw material, and is inseparable from industries such as building materials, steel, metallurgy, textile and the like. According to statistics, 0.6 ton of industrial waste alkali residues are generated when 1 ton of soda is produced by an ammonia-soda process in an alkali plant, the conventional treatment mode of the waste alkali residues is ground accumulation, and the accumulated alkali residue mountain occupies a large amount of land resources and pollutes surrounding soil and environment. At present, mature alkali residue engineering application methods are few, the utilization rate is low, and how to comprehensively utilize the alkali residue in an environment-friendly manner becomes a technical problem.
On the other hand, with the continuous development of road engineering, the road engineering has a great demand on road building materials, and the supply of road building materials is very tight. If the 'alkali slag mountain' accumulated waste can be consumed in road engineering, not only the environmental pollution can be improved, but also the supply of increasingly tense road materials can be relieved. The test results show that the caustic sludge has low strength and is difficult to be used as engineering filling material independently and directly, but researches show that the engineering performance of the material can be improved by adding a small amount of caustic sludge as a modifier.
If the caustic sludge is directly used as a road filling material, the engineering effect is not ideal when the caustic sludge is singly used as an engineering filler due to the characteristics of high water content, strong hydrophilicity, poor water stability and large pore ratio, and the application engineering value of the caustic sludge as the filler is lower. At present, only the additive is used as an additive in a road bed material to be mixed with soil, and the additive is not used as a modifier for improving the lime soil at present.
Disclosure of Invention
The purpose of the invention is as follows: aiming at the defects in the prior art, the invention provides a design method for improving the strength ratio of lime stabilized soil by using caustic sludge so as to improve the strength of the lime stabilized soil.
The technical scheme is as follows: the design method for improving the strength ratio of the lime stabilized soil by the caustic sludge comprises the following steps:
(1) And sampling the test material and testing the natural water content of the test material. The method comprises the steps that dehydrated and dried lime is prepared by the lime according to the grade requirement, caustic sludge and plain soil sample materials are selected from different places of a caustic sludge plant and a roadbed soil taking pit, the caustic sludge and the plain soil sample materials are transported to a laboratory and stored in a ventilation place, the caustic sludge and the plain soil are naturally dried, then the caustic sludge and the plain soil are ground and crushed by a ceramic grinder, a standard sieve is used for sieving, particles larger than 10mm are removed, and finally the natural water content of the caustic sludge and the plain soil are respectively measured through a drying test.
(2) And selecting a certain road as a test section, and taking the existing lime soil ratio of the test road as a reference group ratio. The reference group lime stabilized soil is assumed to be lime by mass ratio: soil = x:100. Lime components in a reference group are replaced by caustic sludge, 4 to 6 groups of caustic sludge lime soil tests with different proportions are designed, and taking 5 groups as an example, the group numbers are A1, A2, A3, A4 and A5 in sequence. The mass ratio of the design soil of each group of samples is unchanged, the caustic sludge of each group is 0%, x/4%, x/2%, 3x/4% and x% in sequence, the content of the corresponding lime of each group is x%, 3x/4%, x/2%, x/4% and 0%, wherein A1 is a reference group number, and the material ratio is lime: alkali residue: soil = X: 0.
(3) The optimal moisture content determination was performed for each test group. Given that the optimal water content of the reference group of the test section is y%, 5 target water contents are designed for each test group of A1, A2, A3, A4 and A5, wherein the target water contents are respectively (y-2)%, (y-1)%, (y + 1)% and (y + 2)% (integers), according to the target water content requirement, a light or heavy compaction test is carried out according to the road engineering inorganic binder stable material test specification and the soil type, and the maximum dry density and the optimal water content of the samples of the groups A1 to A5 are obtained by calculation and fitting according to the dry density of each group.
(4) Based on the optimal water content and the maximum dry density of the group A1-A5, manufacturing a test piece of unconfined compressive strength of alkaline residue limestone soil according to corresponding specifications of Highway engineering inorganic binder stabilized material test regulation (JTG E51-2009), and specifically operating as follows:
a. and (3) designing the ratio of the caustic sludge, the lime and the soil according to the groups A1-A5, and respectively calculating the mass of the three materials of the caustic sludge, the lime and the soil of each group of samples by combining the natural water content and the optimal water content of the caustic sludge and the plain soil.
(1) According to the optimal water content of each group and the natural water content of lime, caustic sludge and soil, calculating the mass of water required to be added to achieve the optimal water content in each group of tests, weighing sufficient water by using a measuring cylinder, filling the water into a spraying pot, uniformly spraying the water into a mixture for 2-3 times, uniformly stirring, filling the mixture into a plastic bag for sealing after uniform stirring, and soaking the plastic bag in the prepared water for sealing.
(2) Coating a thin layer of lubricating oil or butter on the inner wall of a cylindrical test mold specified in an unconfined strength test by using a brush, putting a lower cushion block into the test mold, exposing the bottom end of the lower cushion block for 2cm according to the test specification, and pouring the mixture after the blank material is sealed for a specified time into the cylindrical test mold for 2-3 times. And placing the upper cushion block into the upper part of the cylindrical test mold, gradually compacting downwards, and controlling the end part of the upper cushion block to be exposed for 2cm.
(3) And (3) placing the test mold filled with the soda residue lime stabilized soil on a base of a press machine, enabling an upper chassis of the press machine to contact an upper cushion block of the test mold, starting the press machine, controlling the pressurizing speed to be 1mm/min, maintaining the pressure for 2min when the upper cushion block and the lower cushion block are all pressed into the test mold, stopping pressurizing, taking down the test mold, placing the pressed and formed test mold on a demolding machine for demolding, and taking out the cylindrical test piece.
(4) Weighing the mass m of the test piece by using an electronic scale, accurately measuring the mass m to 1g, measuring the height h of the test piece by using a vernier caliper, measuring the average value for three times, determining the test piece to be qualified if the average value meets the specification, and otherwise, re-manufacturing the test piece. And (4) after the test piece is removed from the test mold and qualified through detection, immediately placing the test piece into a curing box for curing, wherein the conditions are controlled to be 20 +/-1 ℃, the humidity is 95%, and the curing time is 7d. On the last day of the regimen, the test pieces were soaked in water for wet-curing, the water depth exceeding the top surface of the test pieces by about 2.5cm. The test piece was weighed before being placed in water. During the curing period, the quality loss of the test piece is required to be in accordance with the requirement that the small test piece does not exceed 1g, and if the quality loss is not in accordance, the test piece is discarded and is re-made.
(5) The test piece soaked day and night is taken out of the water, and the visible free water on the surface of the test piece is sucked by soft old cloth and the mass m of the test piece is called. And measuring the height h of the test piece by using the vernier caliper to be accurate to 0.1mm, and inspecting the qualification of the test piece according to the standard.
(6) And placing the test piece on a press machine for a compression test. During the test, the displacement control holding rate is about 1mm/min. The maximum pressure P at which the test piece fails is observed and recorded.
(5) And calculating the unconfined compressive strength of the A1-A5 groups of soda residue lime stabilized soil test pieces for 7 days by referring to the Highway engineering inorganic binder stabilized material test regulations (JTG E51-2009), fitting the data, predicting the optimal soda residue mixing amount of the soda residue lime soil according to the fitting result, and finally determining the optimal proportioning of the soda residue lime stabilized soil.
The working principle is as follows: the invention adds proper amount of caustic sludge on the basis of the original lime stabilized soil, utilizes the caustic sludge to improve the consolidation and plate body characteristics of the lime stabilized soil body, and improves the strength of the lime stabilized soil, so that the caustic sludge lime stabilized soil has better engineering bearing capacity.
Has the beneficial effects that: compared with the prior art, the invention has the following advantages:
(1) The invention reduces the use amount of lime in the roadbed engineering and reduces the engineering cost.
(2) The invention applies the industrial waste residue of the alkaline residue to the roadbed construction, thereby reducing the influence of the alkaline residue on the environment; different proportions are adopted according to the grade of the constructed road, and the proper proportion is selected by changing the use amount of the alkaline residue, so that the engineering is more in line with economic expectation and strength expectation.
(3) The strength of the caustic sludge lime stabilized soil obtained by the method is higher than that of the lime stabilized soil before modification, so that the recycling of caustic sludge waste is realized, and the influence of the traditional caustic sludge on production, life and society is reduced.
Drawings
FIG. 1 is a graph showing the results of the moisture content and dry density tests of group A1;
FIG. 2 is a graph showing the results of the A2 group moisture content and dry density tests;
FIG. 3 is a graph showing the results of the A3 group moisture content and dry density tests;
FIG. 4 is a graph of the test results of group A4 of water content and dry density;
FIG. 5 is a graph of the results of the A5 group moisture content and dry density tests;
FIG. 6 is a graph showing the strength test results of test groups under different alkali residue mixing amounts.
Detailed Description
Example (b):
1. selection of test materials
The test cases take a lime stabilized soil material of a certain section of road base in gold lake 247 as a reference group, and the finished dry anhydrous lime is purchased from lime according to the grade requirement. The alkali residue is sampled from a Huaian alkali factory, the alkali residue material is conveyed to a laboratory and then is subjected to preliminary artificial air drying and crushing treatment, and then the alkali residue material is placed in a ventilated place for natural storage. The plain soil is sampled from different places of a soil pit of a road bed of a provincial road of a gold lake 247, the material is conveyed to a test room and then is subjected to primary artificial crushing treatment, and then the material is placed in a ventilated place for natural storage. Screening the preliminarily crushed and naturally stored caustic sludge and plain soil by using a standard sieve to remove particles larger than 10mm, then randomly sampling 10 parts of the caustic sludge and the plain soil, and respectively placing the 10 parts of the caustic sludge and the plain soil into different aluminum boxes, wherein the aluminum boxes are sequentially marked with 1-10. Measuring the mass of the alkali residue and the natural water content of the plain soil by using an electronic scale, then transferring the aluminum box into a drying oven, drying the aluminum box for 12 hours at the temperature of 100 ℃, taking out the baked aluminum box, measuring the mass of the aluminum box by using the electronic scale again, and measuring the average value of the mass of the aluminum box as the natural water content of the alkali residue and the plain soil, wherein the test results are shown in tables 1 and 2.
TABLE 1 Natural water content test result of plain soil
TABLE 2 test results of natural water content of alkaline residue
2. Design of test set proportion scheme and test of optimum water content
(1) The lime stabilized soil for the pavement base of the road in Jinhu 247 province is taken as a reference group, and the mixture ratio is lime: and (2) designing 5 groups of alkaline residue lime soil test groups with different proportions, wherein the group names are A1, A2, A3, A4 and A5 respectively, and the soil = 12. The quality of the soil of each group of samples is unchanged, the caustic sludge of each group is 0%, 3%, 6%, 9% and 12% in sequence, and the corresponding lime content of each group is 12%, 9%, 6%, 3% and 0%. Wherein A1 is a reference group, and the material ratio is lime: alkali residue: soil =12, and the concrete proportioning scheme of each group is shown in table 3.
Table 3 experimental proportioning scheme
(2) Based on the known optimal moisture content of 18.8% for the reference group A1, 5 different target moisture contents were designed for each of the test groups A1, A2, A3, A4, A5, the target moisture contents were 17%, 18%, 19%, 20%, and 21%, respectively, and the test data are shown in Table 4. According to the requirement of the water content, a light compaction test is carried out according to the test specification of the inorganic binder stable material for road engineering, the design of the water content and the mass ratio of the A1-A5 groups of samples are shown in a table 4, the test results are shown in a figure 1-a figure 5, and the analysis of the results is shown in a table 5.
TABLE 4 Water content design and Mass ratios
TABLE 5 test results of optimum moisture content
3. Determination of 7-day unconfined compressive strength of test piece
Based on the optimal water content of the A1-A5 groups of samples, calculating the addition amount of each group of test raw materials and water under the state of the optimal water content of the A1-A5 groups, and manufacturing test pieces of unconfined compressive strength of the caustic sludge lime stabilized soil according to corresponding standards of Highway engineering inorganic binder stabilized material test regulations (JTG E51-2009), wherein the average value of the results of each group of three test pieces is obtained, and the specific operation is as follows:
(1) and naturally airing the alkaline residue and the plain soil in advance, crushing the alkaline residue and the plain soil by using a grinder, and screening by using a standard sieve to remove particles larger than 10 mm.
(2) The mixture ratio of the caustic sludge, the lime and the soil is designed according to the groups A1-A5, the natural water content of the caustic sludge and the plain soil is combined, the quality of the caustic sludge, the lime, the soil and the water of each group of samples is respectively calculated, and the test data are shown in a table 6.
TABLE 6 unconfined compressive strength test material calculation results
(3) And (3) calculating the mass of water required to be added to reach the optimal water content in each group of test samples according to the optimal water content of each group of test samples, weighing enough water by using a measuring cylinder, filling the enough water into a sprinkling can, spraying the enough water into the mixture, uniformly stirring, filling the mixture into a plastic bag after uniformly stirring, sealing the plastic bag, and soaking the plastic bag in the prepared water for sealing.
(4) And coating a thin layer of lubricating oil on the contact surfaces of the inner wall of the cylindrical test mold, the upper cushion block and the lower cushion block by using a brush. And (3) placing the lower cushion block on the bottom surface of the test mold and exposing the lower cushion block for 2cm, pouring the mixture after the material sealing time is reached into the test mold for 3 times, and placing the upper cushion block into the test mold, wherein the upper cushion block is exposed for 2cm.
(5) And (3) placing the test mold on a base of a press machine, enabling an upper chassis of the press machine to contact an upper cushion block of the test mold, starting the press machine, controlling the pressurizing speed to be 1mm/min, stopping pressurizing when the upper cushion block and the lower cushion block are all pressed into the test mold, releasing the pressure after maintaining the pressing state for 2min, taking down the test mold, and placing the pressed test mold on a demolding machine for demolding.
(6) Weighing the mass m of a test piece by using an electronic scale, measuring the mass m to be accurate to 1g, measuring the height h of the test piece by using a vernier caliper, measuring the height h to be accurate to 0.1mm, and determining the test piece to be qualified if the average value is in accordance with the requirement, otherwise, manufacturing the test piece again. After the test piece is taken out of the test mold and weighed, the test piece is immediately placed into a curing box for curing under the conditions that the temperature is 20 +/-1 ℃, the humidity is 95 percent and the curing time is 7 days. On the last day of the regimen, the test pieces were immersed in water to a depth of 2.5cm above the top surface of the test pieces (the mass of the test pieces was weighed before being placed in water). During the curing period, the loss of the quality of the test piece is required to be in accordance with the requirement that the quality of the small test piece is not more than 1g, and if the quality loss is not in accordance with the requirement, the test piece is rejected.
(7) The test piece soaked day and night is taken out of the water, and the visible free water on the surface of the test piece is sucked by soft old cloth and the mass m of the test piece is called. And measuring the height h of the test piece by using the vernier caliper to be accurate to 0.1mm, otherwise, manufacturing the test piece again.
(8) And placing the test piece on a lifting table of a pavement material strength tester to perform a compression test. During the test, the deformation of the test piece should be increased at a constant rate, and the rate should be kept at 1mm/min. And the maximum pressure P (kN) at which the test piece failed was recorded.
And calculating the 7-day unconfined compressive strength of the alkaline residue lime soil samples of the groups A1-A5 by referring to the test regulations for inorganic binder stabilizing materials for highway engineering (JTGE 51-2009), fitting the data, and predicting the optimal alkaline residue mixing amount of the alkaline residue lime soil according to the fitting result, wherein the test data are shown in a table 7 and a figure 6.
TABLE 7 unconfined compressive strength test results
The test fitting result shows that: when the content of the caustic sludge is 2.824%, the compressive strength of the caustic sludge lime soil reaches the maximum value, and is 2.8223MPa. According to the stipulation of 4.2.6 in the detail rule of highway pavement base course construction technology (JTG/T F20-2015), the alkaline residue lime soil proportioning scheme designed by the invention can be used for the base courses of expressways and first-level highways.
Claims (1)
1. A design method for improving the strength ratio of lime stabilized soil by caustic sludge is characterized by comprising the following steps: the method comprises the following steps:
(1) Sampling test materials of caustic sludge, lime and plain soil and testing natural water content;
(2) Selecting a qualified lime soil proportioning scheme in the test road section as a reference group proportioning, and determining the proportioning scheme of each test group; the method comprises the following specific steps: the material proportion of a reference group is assumed as lime: soil = x:100, replacing lime components in a reference group by using caustic sludge, dividing the reference group into a plurality of test groups, keeping the mass ratio of each group of test sample soil unchanged, sequentially increasing the caustic sludge by x/4%, and decreasing the lime content by x/4%;
(3) Determining the optimal water content of each test group; the method specifically comprises the following steps:
(3.1) selecting a reference group and a test group, wherein the quality of the test soil of each group is unchanged;
(3.2) setting a target water content for each test group according to the optimal water content of the reference group, such as (y-2)%, (y-1)%, y%, (y + 1)%, and (y + 2)% and carrying out compaction test, wherein the value y is the optimal water content value of the reference group, and calculating the maximum dry density and the optimal water content of each group according to the dry density of each group;
(4) Preparing a test piece of unconfined compressive strength of the caustic sludge limestone soil; the method specifically comprises the following steps: (4.1) drying the alkaline residue and plain soil, crushing and screening;
(4.2) respectively calculating the mass of each sample group material containing the caustic sludge, the lime, the soil and the water by combining the natural water content of the caustic sludge and the natural water content of the plain soil;
(4.3) calculating the mass of water required by each group of tests to reach the optimal water content according to the optimal water content of each sample group, and spraying water into the mixture for material sealing;
(4.4) placing the lower cushion block of the test mold on the bottom surface of the test mold and exposing the lower cushion block, then pouring the blank material into the test mold, placing the upper cushion block into the test mold, and exposing the upper cushion block and the lower cushion block;
(4.5) placing the test mold on a base of a press machine, keeping the pressure for several minutes and then stopping pressurizing when the upper cushion block and the lower cushion block are completely pressed into the test mold, and placing the pressed test mold on an automatic demolding machine for demolding;
(4.6) stripping the qualified test piece from the test mold, weighing and then placing the test piece into a curing box for curing; during the curing period, if the mass loss of the test piece exceeds 1g, the test piece is rejected;
(4.7) soaking the test piece in water on the 7 th day, taking out the soaked test piece after several hours, sucking water on the surface of the test piece, weighing the mass m of the test piece, and measuring the height h of the test piece;
(4.8) carrying out a compressive strength test on the test piece, recording the maximum pressure of the test piece when the test piece is damaged, and calculating the n-day unconfined compressive strength value of the test piece;
(5) And calculating the unconfined compressive strength of the soda residue lime stabilized soil test piece for 7 days, fitting the data, and predicting the optimal soda residue mixing amount of the soda residue lime soil according to the fitting result.
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| CN116063036B (en) * | 2023-03-03 | 2023-07-21 | 佛山市穗鑫建材有限公司 | Preparation formula and preparation method of bentonite |
| CN117185719A (en) * | 2023-08-24 | 2023-12-08 | 江苏苏盐井神股份有限公司 | Method for designing key parameters of alkaline residue cement stone ash of pavement base layer based on environmental protection requirement |
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