CN115231881A - Ultra-early-strength anti-cracking type sulpho-aluminum cement stabilized macadam and preparation method thereof - Google Patents
Ultra-early-strength anti-cracking type sulpho-aluminum cement stabilized macadam and preparation method thereof Download PDFInfo
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- CN115231881A CN115231881A CN202210861078.7A CN202210861078A CN115231881A CN 115231881 A CN115231881 A CN 115231881A CN 202210861078 A CN202210861078 A CN 202210861078A CN 115231881 A CN115231881 A CN 115231881A
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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
- C04B28/06—Aluminous 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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/0075—Uses not provided for elsewhere in C04B2111/00 for road construction
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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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/34—Non-shrinking or non-cracking materials
- C04B2111/343—Crack resistant materials
-
- 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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- 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Road Paving Structures (AREA)
Abstract
The invention provides ultra-early-strength anti-cracking type sulpho-aluminum cement stabilized macadam and a preparation method thereof, and relates to the technical field of road building materials. The ultra-early-strength anti-cracking sulpho-aluminum cement stabilized macadam is prepared by taking aggregate and admixture as raw materials through the steps of aggregate preparation, infiltration for standby, admixture, curing and the like. According to the invention, the performance of the sulphoaluminate cement binding material is regulated and controlled by compounding the composite retarder and the composite early strength agent, and the relation between the setting time and the early strength is balanced, so that the sulphoaluminate cement stabilized macadam can reach higher unconfined compressive strength and indirect tensile strength when the age is 12-24 h, and further, the technical effect of rapidly opening traffic is realized when the cement stabilized macadam base is repaired. Meanwhile, the ultra-early-strength anti-cracking type sulpho-aluminum cement stabilized macadam provided by the invention is smaller in drying shrinkage, and the service life of a roadbed and a pavement can be prolonged.
Description
Technical Field
The invention relates to the technical field of road building materials, in particular to super early-strength anti-cracking type sulpho-aluminum cement stabilized macadam and a preparation method thereof.
Background
Cement stabilized macadam (hereinafter referred to as water-stabilized) material has become the most widely applied form of road base in our country in recent years due to its advantages of good integrity, good water stability, strong load diffusion capacity and the like. Under the combined action of traffic load, water and temperature, the water stabilization base layer is easy to generate fatigue damage, shrinkage cracking and water damage, so that the surface layer is easy to generate reflection cracks. When the hydrothermally stable foundation is severely damaged, structural repair measures (milling and re-laying) have to be taken. In order to ensure enough bearing capacity, the cement stabilized base layer needs to be maintained for at least 7 days to carry out surface layer construction according to the standard requirement. However, as the traffic volume increases, the traffic jam is easily caused by the excessively long curing time. The method is one of effective means for solving the above dilemma by rapidly improving the early strength of the water stabilization base layer and realizing rapid opening.
The measures for improving the water-stable early strength in the prior art are mainly divided into construction process improvement and cement admixture addition, compared with methods such as construction process improvement, the early strength improving effect of the method for adding the early strength agent to the water-stable early strength is more obvious, but the early strength improvement only by adding the cement admixture is limited, the higher strength is difficult to form in a shorter time, and the quick open traffic cannot be realized. Sulphoaluminate cement has very high early strength and is widely applied to a plurality of rapid repair projects. However, the setting time of the sulphoaluminate cement is very short, and the requirement of the cement stabilized base layer construction on the setting time cannot be met.
Disclosure of Invention
In order to solve the problems, the invention provides the ultra-early-strength anti-cracking type sulphoaluminate cement stabilized macadam and the preparation method thereof.
The preparation method of the ultra-early-strength anti-cracking sulpho-aluminum cement stabilized macadam comprises the following steps:
(1) Aggregate preparation: screening the used aggregate step by step to obtain aggregate:
(2) Adding 2-3 parts by weight of water into 100 parts by weight of aggregate to mix, and putting the uniformly mixed aggregate into a closed container or a sealed plastic bag for soaking for later use;
(3) Uniformly mixing 3-5 parts by weight of cement and 0.025-0.045 part by weight of composite early strength agent to obtain a mixture of the cement and the composite early strength agent;
(4) Pouring the completely soaked aggregate into a mixing pot, adding 0.5-2.5 parts by weight of externally-mixed water, mixing for 30-40 s, adding the cement and the composite early strength agent mixture, and mixing for 60-90 s;
(5) Adding 0.03-0.05 part by weight of composite retarder into the mixture mixed in the step (4) and mixing for 60-90 s;
(6) And (5) fully compacting the mixture mixed in the step (5) and then curing to the corresponding age.
Further, the soaking time in the step (1) is 4-6 h.
Further, in the step (6), the curing temperature is 20 ℃, and the curing relative humidity is more than or equal to 95%.
Further, the aggregate is limestone, and the grading of the limestone satisfies the following conditions: the percentage of passing mesh size 31.5mm is 100%, the percentage of passing mesh size 19.0mm is 75-82%, the percentage of passing mesh size 9.5mm is 44-50%, the percentage of passing mesh size 4.75mm is 28-34%, the percentage of passing mesh size 2.36mm is 18-23%, the percentage of passing mesh size 0.6mm is 8-15% and the percentage of passing mesh size 0.075mm is 2-4%.
Further, the cement is 42.5 sulphoaluminate cement.
Further, the composite retarder comprises 0.01-0.02 part by weight of polycarboxylic acid water reducing agent and 0.015-0.03 part by weight of borax.
Further, the polycarboxylate superplasticizer is white powder, and the water reducing rate is 40%.
Further, the composite early strength agent comprises 0.007 to 0.015 weight part of lithium carbonate and 0.015 to 0.03 weight part of calcium formate.
The invention also provides the ultra-early-strength anti-cracking type sulpho-aluminous cement stabilized macadam prepared by the method.
Compared with the prior art, the invention has the beneficial technical effects that:
(1) The performance of the sulphoaluminate cement cementing material is regulated and controlled by using the compound retarder and the early strength agent, and the relation between the setting time and the early strength is balanced, so that the setting time of the cement-based material is 1.5-2 h, and the construction requirement of cement stabilized macadam is met;
(2) The cement stabilized macadam prepared by the cement admixture and the sulphoaluminate cement-based material can reach higher unconfined compressive strength and indirect tensile strength when the age is 12-24 hours, the unconfined compressive strength is equivalent to the unconfined compressive strength of the cement stabilized macadam prepared by using common portland cement during the 7d age, and when the cement stabilized macadam is repaired, rapid traffic opening can be realized;
(3) The ultra-early-strength anti-cracking water-stable broken stone has higher splitting tensile strength than common water-stable broken stones, smaller drying shrinkage and stronger anti-cracking capability, and can prolong the service life of a roadbed and a road surface.
Detailed Description
The technical solution provided by the present invention is further illustrated by the following examples.
Example 1
A preparation method of ultra-early-strength anti-cracking type sulpho-aluminum cement stabilized macadam comprises the following steps:
(1) Aggregate preparation: screening the used aggregate step by step to obtain aggregate total:
(2) Adding 3 parts by weight of water into 100 parts by weight of aggregate to mix, and soaking the uniformly mixed aggregate in a closed container or a sealed plastic bag for 4 hours for later use;
(3) 3.5 parts by weight of R.SAC.42.5 sulphoaluminate cement and 0.03 part by weight of composite early strength agent are uniformly mixed to obtain a mixture of the cement and the composite early strength agent;
(4) Pouring the completely soaked aggregate into a mixing pot, adding 0.8 part by weight of externally-mixed water, mixing for 30-40 s, adding the mixture of the cement and the composite early strength agent, and mixing for 60-90 s;
(5) Adding 0.035 weight parts of composite retarder into the mixture mixed in the step (4) and mixing for 60-90 s;
(6) And (3) molding the mixture mixed in the step (5) by using a press until the upper cushion block and the lower cushion block are pressed into the mold, demolding after the test piece is molded for 2 hours, and curing the test piece to a specified age in a cement concrete constant-temperature constant-humidity curing box with the temperature of 20 ℃ and the relative humidity of more than or equal to 95% after demolding.
The aggregate has the grading composition that: the percentage of passing mesh size 31.5mm is 100%, the percentage of passing mesh size 19.0mm is 75-85%, the percentage of passing mesh size 9.5mm is 42-54%, the percentage of passing mesh size 4.75mm is 25-35%, the percentage of passing mesh size 2.36mm is 16-26%, the percentage of passing mesh size 0.6mm is 8-15% and the percentage of passing mesh size 0.075mm is 0-5%.
The aggregate is prepared by the following steps: the percentage through mesh size of 31.5mm was 100%, the percentage through mesh size of 19.0mm was 78%, the percentage through mesh size of 9.5mm was 46%, the percentage through mesh size of 4.75mm was 30%, the percentage through mesh size of 2.36mm was 21%, the percentage through mesh size of 0.6mm was 10% and the percentage through mesh size of 0.075mm was 2.8%.
The composite retarder comprises 0.014 part by weight of polycarboxylic acid water reducing agent and 0.021 part by weight of borax.
The composite early strength agent comprises 0.009 parts by weight of lithium carbonate and 0.0021 parts by weight of calcium formate.
Example 2
The difference from the example 1 is that the raw materials and the mixture ratio thereof are as follows: 100 parts of aggregate, 4.0 parts of sulphoaluminate cement, 0.016 part of polycarboxylic acid water reducer, 0.024 part of borax, 0.01 part of lithium carbonate, 0.024 part of calcium formate and 3.8 parts of water by weight, wherein the weight parts of water by weight in the step (2) and the weight parts of water by weight in the step (4) are included.
Example 3
The difference from the example 1 is that the raw materials and the mixture ratio are as follows: 100 parts of aggregate, 4.5 parts of sulphoaluminate cement, 0.018 part of polycarboxylic acid water reducing agent, 0.027 part of borax, 0.027 part of calcium formate, 0.0113 part of lithium carbonate and 3.8 parts of water by weight, wherein the aggregate comprises 3.0 parts of water by weight in the step (2) and 0.8 part of water by weight in the step (4).
Comparative example 1
(1) Aggregate preparation: screening the used aggregate step by step to obtain aggregate total:
(2) Adding 3.2 parts by weight of water into 100 parts by weight of aggregate to mix, and putting the uniformly mixed aggregate into a closed container or a sealed plastic bag for soaking for 4 hours for later use;
(3) Pouring 4.0 parts by weight of ordinary Portland cement and the completely soaked aggregate into a mixing pot, adding 0.8 part by weight of externally-mixed water, and mixing for 120-150 s;
(4) And (4) molding the mixture mixed in the step (3) by using a press machine until the upper cushion block and the lower cushion block are pressed into the mold, demolding after the test piece is molded for 2 hours, and curing the test piece to a specified age by putting the test piece into a cement concrete constant-temperature constant-humidity curing box with the temperature of 20 ℃ and the relative humidity of more than or equal to 95% after demolding.
The aggregate grading was the same as in example 1.
The strength rating of the regular silicate was 42.5.
Comparative example 2
(1) Aggregate preparation: screening the used aggregate step by step to obtain aggregate total:
(2) Adding 3.2 parts by weight of water into 100 parts by weight of aggregate to mix, and putting the uniformly mixed aggregate into a closed container or a sealed plastic bag for soaking for 4 hours for later use;
(3) Uniformly mixing 4.0 parts by weight of ordinary portland cement, 0.01 part by weight of lithium carbonate and 0.024 part by weight of calcium formate to obtain a mixture of cement and an early strength agent;
(4) Pouring the aggregate completely soaked into a mixing pot, adding the mixture of the cement and the early strength agent, and mixing for 60-90 s;
(5) And (3) molding the mixture mixed in the step (5) by using a press until the upper cushion block and the lower cushion block are pressed into the mold, demolding after the test piece is molded for 2 hours, and curing the test piece to a specified age in a cement concrete constant-temperature constant-humidity curing box with the temperature of 20 ℃ and the relative humidity of more than or equal to 95% after demolding.
The aggregate grading was the same as in example 1.
The strength rating of the regular silicate was 42.5.
Comparative example 3
(1) Aggregate preparation: screening the used aggregate step by step to obtain aggregate:
(2) Adding 3.2 parts by weight of water into 100 parts by weight of aggregate to mix, and putting the uniformly mixed aggregate into a closed container or a sealed plastic bag for soaking for 4 hours for later use;
(3) Uniformly mixing 4.0 parts by weight of ordinary portland cement and 0.4 part by weight of SES-I type early strength agent to obtain a mixture of cement and a composite early strength agent;
(4) Pouring the totally soaked aggregate into a mixing pot, adding 0.8 part by weight of externally-mixed water, mixing for 30-40 s, adding the mixture of the cement and the composite early strength agent, and mixing for 60-90 s;
(5) And (4) molding the mixture mixed in the step (4) by using a press until the upper cushion block and the lower cushion block are pressed into the mold, demolding after the test piece is molded for 2 hours, and curing the test piece to a specified age in a cement concrete constant-temperature constant-humidity curing box with the temperature of 20 ℃ and the relative humidity of more than or equal to 95% after demolding.
The aggregate grading was the same as in example 1.
The strength rating of the regular silicate was 42.5.
Test example 1
The unconfined compressive strength, the split tensile strength and the 28d dry shrinkage test were carried out on 12h, 1d, 3d and 7d of examples 1, 2 and 3 and on 1d, 3d, 7d and 28d of comparative examples 1, 2 and 3 by using the test method specified in the test procedure for inorganic binder stabilizing materials for road engineering (JTGE 51-2009).
The unconfined compressive strength and the splitting tensile strength are as follows:
as can be seen from Table 1, the unconfined 12h compressive strength of examples 2 and 3 is higher than the unconfined 7d compressive strength of comparative examples 1 and 2, and the unconfined 12h compressive strength of example 1 is slightly lower than the unconfined 7d compressive strength of comparative example 1. Therefore, although the ordinary early strength agent can improve the early strength of the cement, the improvement effect is not obvious, and the improvement effect on the early strength of the cement is obviously lower than that of the ultra-early strength anti-cracking type sulpho-aluminum cement stabilized macadam.
The split tensile strength development law and the unconfined tensile strength law are similar, the split tensile strength and the unconfined tensile strength are increased along with the increase of age and cement content, the 12h split tensile strength of the examples 2 and 3 is higher than the 7d split tensile strength of the comparative example 1, and the 12h split tensile strength of the example 1 is slightly lower than the 7d split tensile strength of the comparative example 1.
If the unconfined compressive strength index of 7 days is 6MPa, the ultra-early-strength anti-cracking sulpho-aluminum cement stabilized macadam can meet the requirement of surface construction strength within 12 h-1 d, and the technical effect of rapid traffic opening is realized.
The results of the drying shrinkage test are as follows:
as can be seen from table 2, the trend of the change rule of the dry shrinkage strains of examples 1, 2 and 3 is similar to that of comparative examples 1, 2 and 3, and increases with the age. Comparing the dry shrinkage coefficients of example 1, comparative example 2 and comparative example 3, it is known that the dry shrinkage of the cement-stabilized macadam becomes large as the cement content increases. Except that the drying shrinkage of examples 1, 2 and 3 was mainly concentrated in 3d, while the drying shrinkage of comparative examples 1, 2 and 3 was continuously developed in the early stage and the growth rate was gradually slowed down after 7 d. The drying shrinkage factor of example 1, example 2 and example 3 is less than that of comparative example 1, comparative example 2 and comparative example 3 at the same age. As can be seen from comparative examples 1, 2 and 3, the early strength agent can reduce the drying shrinkage of the cement stabilized macadam, but the reducing effect is inferior to that of the super early strength anti-cracking sulpho-alumina cement stabilized macadam proposed in the invention.
In conclusion, compared with the common Portland cement stabilized macadam, the ultra-early-strength anti-cracking sulpho-alumina cement stabilized macadam can achieve higher strength in a shorter time, and can realize quick open traffic when the cement stabilized macadam is repaired. Compared with the common Portland cement stabilized macadam, the ultra-early-strength anti-cracking sulpho-aluminum cement stabilized macadam has higher splitting tensile strength, smaller drying shrinkage and better anti-cracking performance in the same age, and can prolong the service life of the roadbed and the pavement.
The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to help understand the method and the core concept of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (9)
1. The preparation method of the ultra-early-strength anti-cracking sulpho-aluminum cement stabilized macadam is characterized by comprising the following steps of:
(1) Aggregate preparation: screening the used aggregate step by step to obtain aggregate:
(2) Adding 2-3 parts by weight of water into 100 parts by weight of aggregate to mix, and putting the uniformly mixed aggregate into a closed container or a sealed plastic bag for soaking for later use;
(3) Uniformly mixing 3-5 parts by weight of cement and 0.025-0.045 part by weight of composite early strength admixture to obtain a mixture of the cement and the composite early strength admixture;
(4) Pouring the completely soaked aggregate into a mixing pot, adding 0.5-2.5 parts by weight of externally-mixed water, mixing for 30-40 s, adding the cement and the composite early strength agent mixture, and mixing for 60-90 s;
(5) Adding 0.03-0.05 part by weight of composite retarder into the mixture mixed in the step (4) and mixing for 60-90 s;
(6) And (6) fully compacting the mixture mixed in the step (5) and then curing to the corresponding age.
2. The preparation method of the ultra-early-strength anti-cracking sulpho-aluminous cement stabilized macadam of claim 1, wherein the infiltration time in the step (1) is 4-6 hours.
3. The preparation method of the ultra-early-strength anti-cracking sulpho-aluminous cement stabilized macadam of claim 1, wherein the curing temperature in the step (6) is 20 ℃, and the curing relative humidity is not less than 95%.
4. The method for preparing the ultra-early-strength anti-cracking sulpho-aluminum cement stabilized macadam according to claim 1, wherein the aggregate is limestone, and the grading of the limestone meets the following requirements: the percentage of passing mesh size 31.5mm is 100%, the percentage of passing mesh size 19.0mm is 75-82%, the percentage of passing mesh size 9.5mm is 44-50%, the percentage of passing mesh size 4.75mm is 28-34%, the percentage of passing mesh size 2.36mm is 18-23%, the percentage of passing mesh size 0.6mm is 8-15% and the percentage of passing mesh size 0.075mm is 2-4%.
5. The method for preparing the ultra-early-strength anti-cracking sulpho-aluminous cement stabilized macadam according to claim 1, wherein the cement is 42.5 sulphoaluminate cement.
6. The method for preparing the ultra-early-strength anti-cracking sulpho-aluminum cement stabilized macadam of claim 1, wherein the composite retarder comprises 0.01-0.02 parts by weight of polycarboxylic acid water reducing agent and 0.015-0.03 parts by weight of borax.
7. The polycarboxylate water reducer of claim 6 is white powder with a water reduction of 40%.
8. The method for preparing the ultra-early-strength anti-cracking sulpho-aluminum cement stabilized macadam of claim 1, wherein the composite early strength agent comprises 0.007 to 0.015 parts by weight of lithium carbonate and 0.015 to 0.03 parts by weight of calcium formate.
9. An ultra-early-strength anti-cracking sulpho-aluminous cement stabilized macadam, which is prepared by the method of any one of claims 1 to 8.
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