CN114315244B - Cement stabilized macadam mixture and preparation method thereof - Google Patents
Cement stabilized macadam mixture and preparation method thereof Download PDFInfo
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- CN114315244B CN114315244B CN202111556608.9A CN202111556608A CN114315244B CN 114315244 B CN114315244 B CN 114315244B CN 202111556608 A CN202111556608 A CN 202111556608A CN 114315244 B CN114315244 B CN 114315244B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The application relates to the technical field of pavement base materials, and particularly discloses a cement stabilized macadam mixture and a preparation method thereof. The cement stabilized macadam mixture comprises water and aggregates and is characterized by comprising the following raw materials in parts by weight: 1-5 parts of cement, 50-70 parts of broken stone, 4-8 parts of fly ash, 5-15 parts of sand, 5-15 parts of stone chips, 1-3 parts of carboxymethyl cellulose, 1-3 parts of polyvinyl alcohol fiber and 4-10 parts of water; the preparation method comprises the following steps: primarily mixing the broken stone, the sand, the stone chips and the polyvinyl alcohol fiber, then adding water, cement and modified sodium carboxymethylcellulose, and uniformly stirring the mixture for the second time to prepare a mixture. The polyvinyl alcohol fiber cement stabilized macadam mixture can be used for constructing a highway pavement, and has the advantages of avoiding the cracking of cement stabilized macadams as much as possible and ensuring the stability of a pavement base.
Description
Technical Field
The application relates to the technical field of pavement base materials, in particular to a cement stabilized macadam mixture and a preparation method thereof.
Background
The cement stabilized macadam mixture is formed by taking graded macadams as aggregates, filling gaps among the aggregates by adopting a certain amount of cementing materials and enough mortar volume, and spreading and paving the aggregates. The cement stabilized macadam mixture is an ideal base material of a high-grade pavement, and the currently common cement stabilized macadam mixture is mainly applied to road engineering after the procedures of stirring and mixing aggregate and water.
In the process of forming a pavement base material after a cement stabilized macadam mixture is spread and paved in the related technology, the cement stabilized macadam is compacted and formed to have a dry shrinkage phenomenon in a normal curing period, so that a dry shrinkage crack is generated, the strength of the whole structure is reduced, and the stability of the pavement base is influenced.
Disclosure of Invention
In order to avoid the cracking of cement stabilized macadam as much as possible and ensure the stability of a pavement base, the application provides a cement stabilized macadam mixture and a preparation method thereof.
In a first aspect, the application provides a cement stabilized macadam mixture, which adopts the following technical scheme:
the cement stabilized macadam mixture comprises the following raw materials in parts by weight: 1-5 parts of cement, 50-70 parts of broken stone, 4-8 parts of fly ash, 5-15 parts of sand, 5-15 parts of stone chips, 1-3 parts of carboxymethyl cellulose, 1-3 parts of polyvinyl alcohol fiber and 4-10 parts of water.
By adopting the technical scheme, the carboxymethyl cellulose, the polyvinyl alcohol fiber and the fly ash are added into the cement stabilized macadam, so that the addition amount of cement in the aggregate is reduced, the adsorption of the fly ash to water is not strong, the water consumption is reduced when the raw materials are added, the phenomena of drying and temperature shrinkage of the cement are inhibited, and the crack resistance of the cement stabilized macadam mixture is improved; in addition, the fly ash is preferably spherical particles and has fluidity, particles such as broken stones and the like are wrapped and lubricated in the stirring process, so that the cement stabilized broken stone mixture has cohesiveness and plasticity, and aggregate particles of the fly ash play a ball bearing effect at contact points when all raw materials are contacted with each other, so that the stirring workability of the cement stabilized broken stone mixture is improved.
The polyvinyl alcohol fibers are mutually lapped to form a fiber framework to support the cement stabilized macadam from the inside, so that cracks of the cement stabilized macadam mixture caused by drying and temperature shrinkage of cement are reduced, and the bonding strength of the polyvinyl alcohol fibers and the cement stabilized macadam is high, so that the toughness and the impact resistance of the cement stabilized macadam are improved; carboxymethyl cellulose is dissolved in water to form an aqueous solution, the carboxymethyl cellulose aqueous solution has the functions of thickening, film forming and bonding, the cohesive force among all raw material particles is increased, the toughness, the strength and the impact resistance of the cement stabilized macadam are improved, the carboxymethyl cellulose is in a framework form and can be cooperated with polyvinyl alcohol fiber, the stability and the impact resistance of the framework are increased, the mechanical property of the cement stabilized macadam mixture is ensured, meanwhile, the carboxymethyl cellulose reacts with calcium hydroxide contained in fly ash to generate carboxymethyl cellulose calcium, the rapid water absorption and expansion effect is achieved, the carboxymethyl cellulose calcium absorbs water and expands, cracks generated by the cement stabilized macadam are reduced, the condition that the cement stabilized macadam cracks is avoided as much as possible, and the stability effect of a pavement base is ensured.
Preferably, the carboxymethyl cellulose is modified carboxymethyl cellulose, and the modified carboxymethyl cellulose is prepared by graft copolymerization of acrylic acid on carboxymethyl cellulose.
By adopting the technical scheme, after the carboxymethyl cellulose is subjected to acrylic acid graft copolymerization, acrylic acid is connected to a skeleton structure of the carboxymethyl cellulose, so that the carboxymethyl cellulose has a water reducing effect, and the fly ash and the modified carboxymethyl cellulose are cooperated, the water reducing capacity of the modified carboxymethyl cellulose is increased, the content of water required by cement is reduced when the cement stabilized macadam is used, the moisture is prevented from being separated out from the cement stabilized macadam as much as possible, the cracking of the cement stabilized macadam is reduced, and the stability of a pavement base is ensured.
Preferably, the modified carboxymethyl cellulose is prepared from acrylic acid, potassium permanganate and carboxymethyl cellulose in a weight ratio of (4-6): 1: (93-95), the modified carboxymethyl cellulose is prepared by the following steps:
a1, dissolving carboxymethyl cellulose and acrylic acid in water, introducing nitrogen, and stirring for 50-70min to obtain a mixed solution;
and A2, adding the potassium permanganate solution into the mixed solution prepared in the A1, uniformly stirring, heating to 60-80 ℃, and preserving heat for 3-5 hours to prepare the modified carboxymethyl cellulose solution.
Through adopting above-mentioned technical scheme, through potassium permanganate with acrylic acid through the nitrogen agitation, heat preservation and so on step graft copolymerization on carboxymethyl cellulose's skeleton, make carboxymethyl cellulose have the water reducing effect of acrylic acid to make the cement stabilize the rubble reduce the content of the required water of cement when using, avoid moisture to appear from the cement stabilizes the rubble as far as possible, reduce the condition of cement and stabilize the rubble fracture and take place, guarantee the stability of road surface basic unit.
Preferably, the length of the polyvinyl alcohol fiber is 22-26mm.
By adopting the technical scheme, when the length of the polyvinyl alcohol fiber is within the range of 22-26mm, the polyvinyl alcohol fiber can be lapped in the cement stabilized macadam for a certain length to form a high-elasticity and high-hydrophilicity polyvinyl alcohol fiber framework, and a support is formed in the cement stabilized macadam, so that the cement stabilized macadam is effectively inhibited from generating cracks, the toughness of the cement stabilized macadam is increased, and the impact resistance is improved; when the length of the polyvinyl alcohol fibers is less than 22mm, the polyvinyl alcohol fibers are difficult to lap, so that a fiber framework cannot be formed, and the cement stabilized macadam is difficult to support; when the length of the polyvinyl alcohol fiber is more than 26mm, the polyvinyl alcohol fiber is easy to disperse unevenly, and cannot support the cement stabilized macadam all over, so that the cement stabilized macadam still has cracks, and the stability of the pavement base is influenced
Preferably, the particle size of the crushed stone is 10-20mm.
By adopting the technical scheme, the particle size of the crushed stones is 10-20mm, and gaps among the crushed stones are smaller, so that the amount of other raw materials required for filling the gaps can be reduced, the addition amount of moisture is further reduced, and the moisture of other raw materials is prevented from being separated out under the environmental factors of temperature, time and the like as much as possible, so that the cement stabilized crushed stone mixture is not easy to crack; when the particle size of the crushed stone is less than 10mm, the support of the crushed stone on other raw materials such as cement and the like is reduced, and the lightness and hardness of the formed cement stabilized crushed stone mixture are reduced, so that the quality of the cement stabilized crushed stone mixture is influenced; when the particle size of the crushed stones is larger than 20mm, gaps formed among the crushed stones are increased, and the cement amount needs to be increased for filling the gaps, so that the dry shrinkage coefficient and the temperature shrinkage coefficient of the cement stabilized crushed stone mixture are increased, the probability of generating cracks is increased, and the quality of the cement stabilized crushed stone mixture is influenced.
In a second aspect, the application provides a method for preparing a cement stabilized macadam mixture, which adopts the following technical scheme:
a preparation method of a cement stabilized macadam mixture comprises the following steps:
s1, primary mixing: mixing and stirring the broken stone, the fly ash, the sand, the stone chips and the polyvinyl alcohol fiber uniformly to obtain a primary mixture;
s2, secondary mixing: and adding water, cement and carboxymethyl cellulose into the preliminary mixture prepared in the step S1, and uniformly stirring to prepare the cement stabilized macadam mixture.
Through adopting above-mentioned technical scheme, earlier with rubble, fly ash, sand, stone chip and polyvinyl alcohol fibre primary mixing, form cement stabilization rubble mixture after mixing cement, carboxymethyl cellulose and water with preliminary mixture secondary again, make all can evenly distributed in cement stabilization mixture of each raw materials to make cement stabilization rubble reduce the content of the required water of cement when using, avoid moisture to appear from cement stabilization rubble as far as possible, reduce the condition emergence of cement stabilization rubble fracture, guarantee the stability of road surface basic unit.
Preferably, in the step S1, the stirring time is controlled to be 3 to 7S.
By adopting the technical scheme, the stirring time of the broken stone, the fly ash, the sand, the stone chips and the polyvinyl alcohol fiber is controlled to be 3-7s, so that the polyvinyl alcohol fiber is initially and uniformly mixed in other raw materials, the stirring time of the cement stabilized broken stone mixture is shortened as much as possible, and the working efficiency is improved; when the stirring time is less than 3s, the polyvinyl alcohol fibers are easily dispersed unevenly, so that the polyvinyl alcohol fibers are difficult to form an evenly distributed fiber skeleton, and the quality of cement stabilized macadam is influenced; when the stirring time is more than 7s, the polyvinyl alcohol fibers are initially uniformly distributed in other raw materials, so that unnecessary time waste is caused, and the working efficiency is influenced.
Preferably, in the S2, the stirring time is controlled to be 33-37S.
By adopting the technical scheme, the mixture has moisture, a certain lubricating effect can be achieved, the internal friction force generated between particles of each raw material during stirring is effectively reduced, the particles are favorably separated from each other and uniformly mixed, the stirring time of the water, the cement, the modified carboxymethyl cellulose and other raw materials during mixing is controlled to be 33-37s, the raw materials can be stirred more uniformly under the mechanical action, and the effect of improving the quality of cement stabilized macadam is achieved; when the stirring time is less than 33s, all the raw materials are not completely and uniformly dispersed, so that the quality of the prepared cement stabilized macadam mixture is difficult to ensure; when the stirring time is longer than 37s, moisture in the cement is easy to separate out from the cement, so that cracks are easy to appear in the cement stabilized macadam mixture, and the condition that water in the cement is separated out and other raw materials sink is caused, so that the condition that the surface hardness and the strength of the cement stabilized macadam mixture are reduced is caused.
Preferably, in the S1 and the S2, the stirring speed is controlled to be 46-50r/min.
By adopting the technical scheme, the stirring speed is controlled to be 46-50r/min, and the stirring time can be shortened to a certain extent while all raw materials are uniformly stirred, so that the working efficiency is improved while the quality of the cement-stabilized macadam mixture is ensured; when the stirring speed is less than 46r/min, the required stirring time is long, the cement stabilized macadam mixture cannot be uniformly stirred within the same time, and the quality of the cement stabilized macadam mixture is influenced; when the stirring speed is higher than 50r/min, the polyvinyl alcohol fibers are difficult to fully contact with each other, so that the polyvinyl alcohol fibers are difficult to form a skeleton, the strength of the cement-stabilized macadam is reduced, and the cement-stabilized macadam is easy to crack.
In summary, the present application has the following beneficial effects:
1. because the carboxymethyl cellulose, the polyvinyl alcohol fiber and the fly ash are added into the cement stabilized macadam, the addition amount of the cement in the aggregate is reduced, the conditions of drying shrinkage and temperature shrinkage of the cement are inhibited in the raw material proportion, and the crack resistance of the cement stabilized macadam mixture is improved; the fly ash enables the cement stabilized macadam mixture to have cohesiveness and plasticity in the stirring processThe performance of stirring is improved; carboxymethyl cellulose can cooperate with polyvinyl alcohol fiber to increase the stability and impact resistance of a framework, the carboxymethyl cellulose reacts with calcium hydroxide contained in the fly ash to generate carboxymethyl cellulose calcium, the carboxymethyl cellulose calcium can absorb and expand water, and the dry shrinkage coefficient of the cement stabilized macadam is controlled to be (45.11-48.53) multiplied by 10 -6 The temperature coefficient is controlled to be (10.07-11.74) multiplied by 10 in the range of/° C -6 In the range, the crack that the rubble produced is stabilized to the try hard to avoid cement, guarantees the effect of the stability of road surface basic unit.
2. In the application, the length of the polyvinyl alcohol fiber is preferably 22-26mm, so that the polyvinyl alcohol fiber can be lapped for a certain length in the cement stabilized macadam to form a high-elasticity and high-hydrophilicity polyvinyl alcohol fiber framework, thereby forming a support in the cement stabilized macadam, effectively inhibiting the cement stabilized macadam from generating cracks, increasing the toughness of the cement stabilized macadam, improving the impact resistance and obtaining the effect of ensuring the stability of a pavement base.
3. According to the method, cement, gravel, fly ash, sand, stone chips, carboxymethyl cellulose, polyvinyl alcohol fiber and water are subjected to primary mixing and secondary mixing to form a cement stabilized gravel mixture, so that all raw materials are uniformly distributed in the cement stabilized mixture, the content of water required by the cement is reduced when the cement stabilized gravel is used, the precipitation of water from the cement stabilized gravel is avoided as much as possible, the cracking of the cement stabilized gravel is reduced, and the stability of a pavement base is ensured.
Detailed Description
The present application will be described in further detail with reference to examples.
Starting materials
The raw materials used in the examples are commercially available, wherein carboxymethyl cellulose is available from 9000-11-7 of Shanghai-derived leaf Biotech, inc., acrylic acid is available from R017966-500g of Shanghai Yi En Chemicals, inc., potassium permanganate is available from 7722-64-7 of Guangdong aviation Xin science, inc., hydroxyethyl cellulose is available from S14167-250g of Shanghai-derived leaf Biotech, inc., carboxyethyl cellulose is available from 9004-30-2 of Wuhan Jiang Xin Biotech, inc., crotonic acid is available from R008063-100g of Shanghai Yi En Chemicals, inc., acrolein is available from 107-02-8 of Hubei Chengfeng chemical, inc., and polyvinyl alcohol fiber is available from S30196-500g of Shanghai leaf Biotech, inc.
Preparation examples
Preparation example 1
The preparation method of the modified carboxymethyl cellulose comprises the following steps:
a1, dissolving 95kg of carboxymethyl cellulose and 4kg of acrylic acid in water, introducing nitrogen, and stirring for 50min to obtain a mixed solution;
and A2, adding 1kg of potassium permanganate solution into the mixed solution prepared in the A1, uniformly stirring, heating to 60 ℃, and preserving heat for 3 hours to prepare the modified carboxymethyl cellulose solution.
Preparation examples 2 to 3
Different from preparation example 1, the raw material ratios and reaction conditions for preparing modified carboxymethyl cellulose in preparation examples 2 to 3 are different, and the details are shown in Table 1.
TABLE 1 raw material ratios of preparation examples 1 to 3
| Carboxymethyl cellulose/kg | Acrylic acid/kg | Potassium permanganate/kg | Stirring time/min | Heating temperature/. Degree.C | Holding time/h | |
| Preparation example 1 | 95 | 4 | 1 | 70 | 80 | 5 |
| Preparation example 2 | 94 | 5 | 1 | 60 | 70 | 4 |
| Preparation example 3 | 93 | 6 | 1 | 50 | 60 | 3 |
Preparation example 4
In contrast to preparation 2, preparation 4 used the same amount of crotonic acid instead of acrylic acid.
Preparation example 5
In contrast to preparation 2, preparation 5 used an equivalent amount of acrolein in place of acrylic acid.
Examples
Example 1
The preparation method of the cement stabilized macadam mixture comprises the following steps:
s1, primary mixing: mixing and stirring 50kg of broken stones, 15kg of sand, 5kg of stone chips and 3kg of polyvinyl alcohol fibers uniformly to obtain a primary mixture, wherein the particle size of the broken stones is 10mm, and the length of the polyvinyl alcohol fibers is 22mm;
s2, secondary mixing: and adding 4kg of water, 5kg of cement and 1kg of carboxymethyl cellulose into the primary mixture prepared in the step S1, and uniformly stirring to prepare the cement stabilized macadam mixture.
Examples 2 to 9
Different from the embodiment 1, the raw material proportion for preparing the polyvinyl alcohol fiber cement stabilized macadam mixture in the embodiments 2 to 9 is different, and the details are shown in the table 2.
TABLE 2 raw material ratios of examples 1-9
| Examples | Crushed stone/kg | Crushed stone particle size/mm | Sand/kg | Stone chips/kg | Polyvinyl alcohol fiber/kg | Length/mm of polyvinyl alcohol fiber | Water/kg | Cement/kg | Carboxymethyl cellulose/kg |
| Example 1 | 50 | 15 | 15 | 15 | 3 | 22 | 4 | 1 | 1 |
| Example 2 | 60 | 15 | 10 | 10 | 2 | 22 | 7 | 3 | 1 |
| Example 3 | 70 | 15 | 5 | 5 | 1 | 22 | 10 | 5 | 1 |
| Example 4 | 60 | 15 | 10 | 10 | 2 | 22 | 7 | 3 | 2 |
| Example 5 | 60 | 15 | 10 | 10 | 3 | 22 | 7 | 3 | 3 |
| Example 6 | 60 | 15 | 10 | 10 | 2 | 24 | 7 | 3 | 2 |
| Example 7 | 60 | 15 | 10 | 10 | 2 | 26 | 7 | 3 | 2 |
| Example 8 | 60 | 10 | 10 | 10 | 2 | 24 | 7 | 3 | 2 |
| Example 9 | 60 | 20 | 10 | 10 | 2 | 24 | 7 | 3 | 2 |
Examples 10 to 14
In contrast to example 6, in examples 10 to 14, the carboxymethyl cellulose was replaced with an equal amount of the modified carboxymethyl cellulose from preparation examples 1 to 5.
Comparative example
Comparative example 1
A cement stabilized macadam mixture, which is different from example 1 in that no carboxymethyl cellulose is added in comparative example 1.
Comparative example 2
A cement stabilized macadam mixture, different from example 1, in comparative example 2, polyvinyl alcohol fiber was not added.
Comparative example 3
A cement stabilized macadam mixture, which is different from example 1 in that polyvinyl alcohol fiber and carboxymethyl cellulose are not added in comparative example 3.
Comparative example 4
A cement stabilized macadam mixture, differing from example 1 in that in comparative example 4 the carboxymethylcellulose is replaced by an equivalent amount of hydroxyethylcellulose.
Comparative example 5
A cement stabilized macadam mixture differing from example 1 in that in comparative example 5 the carboxymethyl cellulose was replaced by an equal amount of carboxyethyl cellulose.
Performance test
The following performance tests were performed on the cement stabilized macadam mixtures obtained in examples 1 to 14 and comparative examples 1 to 5. The performance detection comprises unconfined compression strength, indirect tensile strength, dry shrinkage coefficient and temperature shrinkage coefficient of the cement stabilized macadam mixture, and the detection data are shown in a table 3.
1. Unconfined compressive strength
And detecting the unconfined compressive strength of the prepared cement stabilized macadam mixture according to the detection standard of national standard JTG 3430-2020 road geotechnical test regulation. Detecting the environment: at 25 ℃.
2. Indirect tensile strength
And detecting the indirect tensile strength of the prepared cement stabilized macadam mixture according to the detection standard of national standard JTG E51-2009 test Specification for inorganic binder stabilizing materials for highway engineering. Detecting the environment: at 25 ℃.
3. Coefficient of dry shrinkage
And detecting the shrinkage rate of the prepared cement stabilized macadam mixture according to the detection standard of GB/T29417-2012 test method for drying shrinkage cracking performance of cement mortar and concrete. Detecting the environment: at 25 ℃.
4. Coefficient of thermal contraction
And (3) detecting the shrinkage rate of the prepared cement stabilized macadam mixture according to the detection standard of the national standard GB/T29417-2012 test method for the drying shrinkage cracking performance of cement mortar and concrete. Detecting the environment: at 25 ℃.
TABLE 3 Performance test data sheet
| Unconfined compressive strength/MPa | Indirect tensile strength/Mpa | Coefficient of drying shrinkage (10) -6 /℃） | Coefficient of thermal contraction (10) -6 ） | |
| Example 1 | 4.1 | 0.42 | 51.10 | 12.46 |
| Example 2 | 4.3 | 0.43 | 50.27 | 12.25 |
| Example 3 | 4.2 | 0.43 | 50.75 | 12.37 |
| Example 4 | 4.6 | 0.45 | 48.82 | 11.93 |
| Examples5 | 4.4 | 0.44 | 49.59 | 12.07 |
| Example 6 | 4.7 | 0.46 | 48.53 | 11.74 |
| Example 7 | 4.4 | 0.43 | 48.64 | 11.82 |
| Example 8 | 4.5 | 0.42 | 48.71 | 11.89 |
| Example 9 | 4.4 | 0.43 | 48.69 | 11.84 |
| Example 10 | 5.0 | 0.49 | 47.32 | 10.79 |
| Example 11 | 5.5 | 0.53 | 45.11 | 10.07 |
| Example 12 | 5.3 | 0.52 | 45.23 | 10.37 |
| Example 13 | 4.8 | 0.49 | 48.23 | 11.17 |
| Example 14 | 4.9 | 0.48 | 48.31 | 11.25 |
| Comparative example 1 | 3.7 | 0.40 | 53.29 | 13.8 |
| Comparative example 2 | 3.6 | 0.39 | 53.92 | 13.87 |
| Comparative example 3 | 3.5 | 0.37 | 54.17 | 14.00 |
| Comparative example 4 | 3.8 | 0.41 | 53.22 | 13.71 |
| Comparative example 5 | 3.8 | 0.40 | 53.19 | 13.70 |
The present application is described in detail below with reference to the test data provided in table 3.
The cement-stabilized macadam mixtures prepared in the examples 1 to 14 are better than the comparative examples in all properties by combining the examples 1 to 14 and the comparative examples 1 to 5, which shows that the cement-stabilized macadam mixtures prepared in the application are better in unconfined compressive strength, indirect tensile strength, dry shrinkage coefficient and temperature shrinkage coefficient.
In examples 1 to 5, the addition ratio of the cement stabilized macadam mixture and the particle size of the macadam were compared. The result shows that the cement stabilized macadam mixture prepared in the example 4 is better in the aspects of unconfined compressive strength, indirect tensile strength, dry shrinkage coefficient and temperature shrinkage coefficient, which shows that the addition proportion of the cement stabilized macadam mixture in the example 4 is better.
In comparison with example 4, the present application examined the effect of polyvinyl alcohol fiber length on cement stabilized macadam mixtures in examples 6 and 7. The result shows that the polyvinyl alcohol fiber in example 4 is shorter, the unconfined compressive strength and indirect tensile strength of the prepared cement stabilized macadam mixture are lower, and the dry shrinkage coefficient and the temperature shrinkage coefficient are higher; in example 7, the polyvinyl alcohol fiber is longer, and the unconfined compressive strength and indirect tensile strength of the prepared cement stabilized macadam mixture are still lower, and the dry shrinkage coefficient and the temperature shrinkage coefficient are larger, which indicates that the polyvinyl alcohol fiber selected in example 6 is moderate in length, and has better effects on the unconfined compressive strength, the indirect tensile strength, the dry shrinkage coefficient and the temperature shrinkage coefficient of the cement stabilized macadam mixture.
In comparison with example 6, the present application examined the influence of the particle size of the crushed stone on the cement stabilized crushed stone mixture in examples 8 and 9. The result shows that the particle size is smaller at any time in the example 8, the unconfined compressive strength and indirect tensile strength of the prepared cement stabilized macadam mixture are lower, and the dry shrinkage coefficient and the temperature shrinkage coefficient are larger; the crushed stone in the example 9 has larger particle size, the unconfined compressive strength and indirect tensile strength of the prepared cement stabilized crushed stone mixture are still lower, and the dry shrinkage coefficient and the temperature shrinkage coefficient are larger, which shows that the crushed stone selected in the example 6 has moderate particle size and has better effects on the unconfined compressive strength, the indirect tensile strength, the dry shrinkage coefficient and the temperature shrinkage coefficient of the cement stabilized crushed stone mixture.
The present application examined the effect of modified carboxymethylcellulose in examples 10-12, using example 6 as a control. As a result, it was found that the cement stabilized macadam mixtures prepared in examples 10 to 12 are superior to example 6 in terms of unconfined compressive strength, indirect tensile strength, dry shrinkage coefficient and temperature shrinkage coefficient, probably because the carboxymethyl cellulose is modified to improve the dispersibility, expansibility and water absorbability of carboxymethyl cellulose, so that the carboxymethyl cellulose can better reduce the occurrence of cracks in the cement stabilized macadam mixture due to moisture exudation, and improve the crack resistance of the cement stabilized macadam mixture.
In examples 10 to 12 of the present application, the influence of different raw material ratios of the modified carboxymethyl cellulose on the cement stabilized macadam mixture was examined. As a result, the cement stabilized macadam mixture prepared in example 11 was found to perform better in terms of unconfined compressive strength, indirect tensile strength, dry shrinkage coefficient and temperature shrinkage coefficient, which indicates that the raw material formulation of the modified carboxymethyl cellulose in example 11 is better than the effects achieved by the cement stabilized macadam mixture in terms of unconfined compressive strength, indirect tensile strength, dry shrinkage coefficient and temperature shrinkage coefficient.
In comparison with example 11, the present application examined the effect of different substances on the modification of carboxymethylcellulose in examples 13 and 14. As a result, in example 13 and example 14, since the carboxymethyl cellulose is replaced by the butyl acid and the acrolein respectively, the prepared cement stabilized macadam mixture has poor performances in terms of unconfined compressive strength, indirect tensile strength, dry shrinkage coefficient and temperature shrinkage coefficient, which indicates that the better effect can be achieved by selecting the acrylic acid to modify the carboxymethyl cellulose.
In comparison with example 1, the present application examined the effect of carboxymethylcellulose and polyvinyl alcohol fibers on cement stabilized macadam mixes in comparative examples 1-3. The result shows that the cement stabilized macadam mixture prepared by the method of the comparative example 1 without adding the modified carboxymethyl cellulose has poor performances in the aspects of unconfined compressive strength, indirect tensile strength, dry shrinkage coefficient and temperature shrinkage coefficient; compared with the prior art, the polyvinyl alcohol fiber is not added in the comparative example 2, and the prepared cement stabilized macadam mixture has poor performances in unconfined compressive strength, indirect tensile strength, dry shrinkage coefficient and temperature shrinkage coefficient; in the comparative example 3, the modified carboxymethyl cellulose and the polyvinyl alcohol fiber are not added, and the prepared cement stabilized macadam mixture has the same poor performance in the aspects of unconfined compressive strength, indirect tensile strength, dry shrinkage coefficient and temperature shrinkage coefficient; the fact shows that the carboxymethyl cellulose and the polyvinyl alcohol fiber are added, so that the carboxymethyl cellulose and the polyvinyl alcohol fiber are cooperated, cracks of the cement stabilized macadam mixture are inhibited, and the crack resistance of the cement stabilized macadam is improved.
In comparison with example 1, the present application examined the effect of different celluloses on cement stabilized macadam mixes in comparative examples 4 and 5. The results show that in comparative example 4 and comparative example 5, since carboxymethyl cellulose is replaced by hydroxyethyl cellulose and carboxyethyl cellulose respectively, the prepared cement stabilized macadam mixture has poor performances in terms of unconfined compressive strength, indirect tensile strength, dry shrinkage coefficient and temperature shrinkage coefficient, and the carboxymethyl cellulose is selected to achieve better effects.
The present embodiment is only for explaining the present application, and it is not limited to the present application, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present application.
Claims (6)
1. The cement stabilized macadam mixture is characterized by comprising the following raw materials in parts by weight: 1-5 parts of cement, 50-70 parts of broken stone, 4-8 parts of fly ash, 5-15 parts of sand, 5-15 parts of stone chips, 1-3 parts of modified carboxymethyl cellulose, 1-3 parts of polyvinyl alcohol fiber with the length of 22-26mm and 4-10 parts of water; wherein, the modified carboxymethyl cellulose is prepared by graft copolymerization of acrylic acid on carboxymethyl cellulose, and the modified carboxymethyl cellulose is prepared by mixing acrylic acid, potassium permanganate and carboxymethyl cellulose according to the weight ratio of (4-6): 1: (93-95), the modified carboxymethyl cellulose is prepared by the following steps:
a1, dissolving carboxymethyl cellulose and acrylic acid in water, introducing nitrogen, and stirring for 50-70min to obtain a mixed solution;
and A2, adding the potassium permanganate solution into the mixed solution prepared in the step A1, uniformly stirring, heating to 60-80 ℃, and preserving heat for 3-5 hours to prepare the modified carboxymethyl cellulose solution.
2. The cement stabilized macadam mixture as claimed in claim 1, wherein: the particle size of the gravel is 10-20mm.
3. A method of preparing a cement stabilized macadam mixture as claimed in any one of claims 1 to 2, characterised by: the method comprises the following steps:
s1, primary mixing: mixing and stirring the broken stone, the fly ash, the sand, the stone chips and the polyvinyl alcohol fiber uniformly to obtain a primary mixture;
s2, secondary mixing: and adding water, cement and modified carboxymethyl cellulose into the preliminary mixture prepared in the step S1, and uniformly stirring to prepare the cement stabilized macadam mixture.
4. The method for preparing a cement stabilized macadam mixture according to claim 3, wherein: and in the step S1, the stirring time is controlled to be 3-7S.
5. The method for preparing a cement stabilized macadam mixture according to claim 3, wherein: in the S2, the stirring time is controlled to be 33-37S.
6. The method for preparing a cement stabilized macadam mixture according to claim 3, wherein: in the S1 and the S2, the stirring speed is controlled to be 46-50r/min.
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| CN102515611B (en) * | 2011-12-13 | 2013-09-25 | 江南大学 | Multifunctional dry-mixed mortar additive and preparation method thereof |
| CA2879757C (en) * | 2012-09-07 | 2017-02-28 | Halliburton Energy Services, Inc. | Cement compositions and methods of using the same |
| CN104150834A (en) * | 2014-08-21 | 2014-11-19 | 东南大学 | Medium-coarse aggregate high-toughness polyvinyl alcohol fiber-reinforced cement-based composite material |
| CN110714382B (en) * | 2019-10-16 | 2021-11-23 | 北京城建华晟交通建设有限公司 | Road base construction method for cement stabilized macadam mixture in high-temperature season |
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