CN113267406A - Material design method of cement asphalt composite cementing mixture based on crack resistance - Google Patents
Material design method of cement asphalt composite cementing mixture based on crack resistance Download PDFInfo
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Abstract
The invention discloses a material design method of a cement asphalt composite cementing mixture based on crack resistance, which comprises the following steps: step one, determining a reasonable dosage proportion of cement and emulsified asphalt: step 1, preparing a cement-emulsified asphalt composite cementing material test piece; step 2, preparing a direct tensile test; step 3, direct tensile test; step 4, processing test results; step 5, determining the reasonable dosage proportion of the cement and the emulsified asphalt; step two, determining the reasonable amount of the composite cementing material: step 6, manufacturing a cement asphalt composite cementing mixture test piece; step 7, testing strength; and 8, determining the reasonable using amount of the composite cementing material. The invention fully considers the cracking resistance of the cement asphalt composite cementing mixture and can better exert the capability of the cement asphalt composite cementing mixture for resisting reflection cracks.
Description
Technical Field
The invention relates to a material design method of a cement asphalt composite cementing mixture, in particular to a material design method of a cement asphalt composite cementing mixture based on crack resistance.
Background
The cement asphalt composite cementing mixture is formed by mixing cement, emulsified asphalt and aggregates with a certain gradation, and is formed by hydration of the cement and demulsification and cementation of the emulsified asphalt. The cement asphalt composite cementing mixture is formed by mixing a composite cementing material formed by cement and emulsified asphalt with aggregate, so that normal-temperature construction can be realized, heating is not required, and the cement asphalt composite cementing mixture has the technical advantages of construction. Meanwhile, the cement and asphalt composite cementing mixture adopts cement and asphalt as composite cementing materials, so that the cement and asphalt composite cementing mixture has certain rigidity and strength, and also has certain flexibility and deformability, and the cement and asphalt composite cementing mixture has good cracking resistance. In the material design of the cement asphalt composite cementing mixture, the dosage proportion of cement and emulsified asphalt and the dosage of the composite cementing material need to be determined, more factors need to be considered, and the material design is more complex.
At present, no unified material design method exists for the cement asphalt composite cementing mixture. The usual design method is to use marshall test method to determine the amount of cement and emulsified asphalt respectively. When the dosage of the cement and the emulsified asphalt is determined, an orthogonal test method is adopted, and the test amount is large. In addition, in the aspect of a specific design method, the strength characteristic of the cement asphalt composite cementing mixture is emphasized, the anti-cracking performance of the cement asphalt composite cementing mixture is not considered fully, and the anti-cracking performance requirement of the material is not considered fully in the material design of the cement asphalt composite cementing mixture.
Disclosure of Invention
The invention aims to provide a material design method of a cement asphalt composite cementing mixture based on crack resistance, which is used for guiding the material design of the cement asphalt composite cementing mixture, determining the reasonable mixing proportion of cement and emulsified asphalt and the reasonable dosage of a composite cementing material and fully exerting the crack resistance of the cement asphalt composite cementing mixture.
The purpose of the invention is realized by the following technical scheme:
a material design method of a cement asphalt composite cementing mixture based on crack resistance comprises the following steps:
step one, determining the reasonable dosage proportion of cement and emulsified asphalt
selecting 5 different cement-asphalt composite cementing material test pieces formed by the mass ratio of cement to emulsified asphalt respectively, and forming at least 4 test pieces in each proportion, wherein the concrete steps are as follows:
(1) mixing cement and emulsified asphalt according to a determined proportion, and then pouring into a test mold;
(2) in the pouring process of the test piece, inserting a thin steel sheet into the middle position of the top surface of the test mold, clamping the test mold, taking out the thin steel sheet after the test piece is hardened, and forming a crack on the top surface of the test piece;
(3) removing the mold after 3d, and placing the test piece into a curing chamber for curing after the mold is removed, wherein the curing time is 7 d;
step 2, preparing a direct tensile test:
firstly, repairing and leveling the top surface of a prefabricated crack of a cement-emulsified asphalt composite cementing material test piece, and then respectively bonding an upper loading plate and a lower loading plate on two sides of the crack of the test piece;
step 3, direct tensile test:
the method is characterized by carrying out direct tensile test on a cement-emulsified asphalt composite cementing material test piece, and specifically comprises the following steps: fixing a support base on a loading tester platform, connecting a loading head with an actuator of the loading tester, clamping the lower end of the loading head on a lower loading plate of a test piece, clamping an upper loading plate on the support base, and starting the loading tester to load until the test piece is completely broken;
and 4, processing test results:
respectively drawing a force-displacement curve at the upper pressure head for each test result, and respectively obtaining the peak force of each curve and the displacement corresponding to the peak force;
averaging the peak force and the displacement corresponding to the peak force of the parallel test pieces in the same proportion to obtain the average peak force and the average displacement corresponding to the peak force of the proportion;
step 5, determining the reasonable dosage proportion of the cement and the emulsified asphalt:
normalizing the average peak force and the corresponding average displacement, namely dividing the 5 average peak forces and the 5 average displacements by respective maximum values to obtain normalized values of the average peak force and the average displacement, drawing a curve by taking the mass ratio of the cement to the emulsified asphalt as an abscissa and the normalized values of the average peak force and the average displacement as an ordinate, and interpolating to obtain a reasonable dosage proportion of the cement to the emulsified asphalt through the intersection point of the two curves of the normalized values of the average peak force and the average displacement;
step two, determining the reasonable amount of the composite cementing material
Step 6, manufacturing a cement asphalt composite cementing mixture test piece:
taking the reasonable dosage proportion of the cement and the emulsified asphalt determined in the step one as a basis, taking different dosage of the cementing material, mixing the cementing material with aggregate to form a cement asphalt composite cementing mixture, manufacturing a cement asphalt composite cementing material test piece by a compaction method, and curing after the manufacturing is finished, wherein: preparing at least 8 test pieces by using the amount of each composite cementing material, wherein the curing time is 7 days;
step 7, strength testing:
testing the strength of the test piece reaching the health preserving period; averaging the strength of the test piece with the same amount of the composite cementing material to obtain the average strength of the test piece under the amount of each composite cementing material;
step 8, determining the reasonable amount of the composite cementing material:
according to the strength test result, drawing a composite cementing material dosage-strength curve by taking the composite cementing material dosage as an abscissa and the strength as an ordinate, and interpolating through the curve to obtain the corresponding minimum cementing material dosage when the strength is more than or equal to 3.0MPa, namely the reasonable dosage of the composite cementing material.
Compared with the prior art, the invention has the following advantages:
1. the method can determine the reasonable dosage proportion of the cement and the emulsified asphalt and the reasonable dosage of the composite cementing material, and the test amount is small.
2. The cracking resistance of the cement asphalt composite cementing mixture is fully considered, and the capability of the cement asphalt composite cementing mixture for resisting reflection cracks can be better exerted.
Drawings
FIG. 1 is a clamp assembly for direct tensile testing;
FIG. 2 is the bonding of a loading plate to a test piece;
FIG. 3 is a test pattern of a direct tensile test;
FIG. 4 is a determination of peak force and corresponding displacement;
FIG. 5 is a determination of a reasonable dosage ratio of cement to emulsified asphalt;
figure 6 is a determination of the reasonable amount of composite cement.
Detailed Description
The technical solution of the present invention is further described below with reference to the accompanying drawings, but not limited thereto, and any modification or equivalent replacement of the technical solution of the present invention without departing from the spirit and scope of the technical solution of the present invention shall be covered by the protection scope of the present invention.
The invention provides a material design method of a cement asphalt composite cementing mixture based on crack resistance, which is mainly characterized by comprising the following two aspects: firstly, a two-step design method is provided; secondly, in the material design process, a direct tensile test method for evaluating the cracking resistance of the material based on a reflection crack formation mechanism is provided, wherein:
the two-step design method for designing the cement asphalt composite cementing mixture material comprises the following steps: the method comprises the steps of firstly determining the reasonable dosage proportion of cement and emulsified asphalt, and secondly determining the reasonable dosage of the cement-emulsified asphalt composite cementing material on the basis of determining the reasonable dosage proportion of the cement and the emulsified asphalt.
A direct tensile test method for the crack resistance of a material based on a reflective crack formation mechanism comprises the following steps: reflective cracking is the upward propagation behavior of a crack due to the stretching effect created by the movement of the substrate after the crack is created in a semi-rigid substrate. At present, no effective test simulation method exists for the propagation behavior of the crack, which is mainly because a common MTS material testing machine can only provide a pressure loading test mode, and because of the particularity of the material, the conventional clamp cannot meet the tensile loading requirement of the material for a tensile testing machine with a tensile loading mode. The invention develops a direct tensile test fixture for simulating the propagation of the reflection crack based on an MTS pressure loading tester, and provides a direct tensile test method. The cracking resistance of the cement asphalt composite cementing mixture can be well evaluated by the method.
The specific method comprises the following steps:
firstly, determining the reasonable dosage proportion a of cement and emulsified asphalt
Step 2, preparing a direct tensile test: the direct tensile test fixture mainly comprises a supporting base, an upper loading plate, a lower loading plate and a loading head, and the direct tensile test fixture is shown in figure 1. The top surface of a prefabricated crack of a cement-emulsified asphalt composite cementing material test piece is firstly repaired to be flat, then an upper loading plate and a lower loading plate are respectively bonded on two sides of the crack of the test piece, and the bonding of the loading plates and the test piece is shown in figure 2.
Step 3, direct tensile test: the support base is fixed on the loading tester platform, the loading head is connected with the actuator of the MTS loading tester, the lower end of the loading head is clamped on the lower loading plate of the test piece, the upper loading plate is clamped on the support base, and the test mode of the direct tensile test is shown in figure 3. And starting the testing machine to load, and controlling the loading rate at 1mm/min until the test piece is completely broken. And (3) respectively carrying out direct tensile test on the cement emulsified asphalt composite cementing material test pieces with five proportions.
And 4, processing test results: and (4) respectively drawing a force-displacement curve at the upper pressure head for each test result, and respectively obtaining the peak force of each curve and the displacement corresponding to the peak force. And averaging the peak force and the displacement corresponding to the peak force of the four parallel test pieces in the same proportion to obtain the average peak force and the average displacement corresponding to the peak force of the proportion.
Step 5, determining the reasonable dosage proportion of the cement and the emulsified asphalt: and (3) normalizing the average peak force and the corresponding average displacement of the five proportions, namely dividing the average peak force and the average displacement by respective maximum values to obtain normalized values of the average peak force and the average displacement, drawing curves of the normalized values of the average peak force and the average displacement under the same coordinate system (the abscissa is the mass ratio of the cement to the emulsified asphalt, and the ordinate is the normalized value), and interpolating to obtain the reasonable dosage proportion of the cement to the emulsified asphalt through the intersection point of the two curves.
Secondly, determining the reasonable dosage b of the composite cementing material
Step 6, manufacturing a cement asphalt composite cementing mixture test piece: based on the above-determined reasonable dosage proportion of cement and emulsified asphalt, five different cementing material dosages are taken and mixed with a certain gradation aggregate to synthesize the cement asphalt composite cementing mixture, cement asphalt composite cementing material test pieces are manufactured by a compaction method, and 8 test pieces are manufactured by each composite cementing material dosage. The curing time is 7 days after the preparation is finished.
Step 7, strength testing: and testing the strength of the test piece reaching the life-preserving period. And averaging the strengths of the 8 test pieces to obtain the average strength of the test pieces under the use amount of each composite cementing material.
Step 8, determining the reasonable amount of the composite cementing material: according to the strength test result, drawing a composite cementing material dosage-strength curve by taking the composite cementing material dosage as an abscissa and the strength as an ordinate, and interpolating through the curve to obtain the corresponding minimum cementing material dosage when the strength is more than or equal to 3.0MPa, namely the reasonable dosage of the composite cementing material.
Examples of applications are:
firstly, determining the reasonable dosage proportion a of cement and emulsified asphalt
Step 2, preparing a direct tensile test: the top surface of a prefabricated crack of the cement-emulsified asphalt composite cementing material test piece is repaired to be flat, and then the upper loading plate and the lower loading plate are respectively bonded on two sides of the crack of the test piece.
Step 3, direct tensile test: the test support base is fixed on a loading tester platform, the loading head is connected with an actuator of the MTS loading tester, the lower end of the loading head is clamped on a lower loading plate of the test piece, an upper loading plate is clamped on the support base, the testing machine is started to carry out loading, and the loading rate is controlled to be 1m/min until the test piece is completely broken. And (3) respectively carrying out direct tensile test on the cement emulsified asphalt composite cementing material test pieces with five proportions.
And 4, processing test results: for each test result, a force-displacement curve is drawn, and the peak force and the displacement corresponding to the peak force of each curve are obtained, for example, for a sample with the mass ratio of cement to emulsified asphalt a1=0.5, the peak force F1-1 and the corresponding displacement S1-1 of the first sample are determined as shown in fig. 4. The peak forces of the four test pieces are determined to be F1-1, F1-2, F1-3 and F1-4 respectively through the method; the displacements corresponding to the peak forces of the four test pieces are respectively S1-1, S1-2, S1-3 and S1-4. And averaging the peak force and the displacement corresponding to the peak force of the four parallel test pieces to obtain the average peak force and the average displacement corresponding to the peak force of the mixture ratio. For example, for a sample with the mass ratio of cement to emulsified asphalt, a1=0.5, the average peak force is F1= (F1-1 + F1-2+ F1-3+ F1-4)/4; the average displacement was S1= (S1-1 + S1-2+ S1-3+ S1-4)/4.
Step 5, determining the reasonable dosage proportion of the cement and the asphalt: the average peak force (F1, F2, F3, F4 and F5) and the corresponding average displacement (S1, S2, S3, S4 and S5) of the five proportions are normalized, namely the average peak force and the average displacement are respectively divided by the respective maximum values to obtain normalized values of the average peak force and the average displacement. The maximum value of the average peak force is FMAX (generally, FMAX = F5), and the maximum value of the average displacement is SMAX (generally, SMAX = S1). The mean peak force normalized values are α 1= F1/FMAX, α 2= F2/FMAX, α 3= F3/FMAX, α 4= F4/FMAX, α 5= F5/FMAX, respectively; the normalized values of the average displacement are respectively β 1= S1/SMAX, β 2= S2/SMAX, β 3= S3/SMAX, β 4= S4/SMAX, β 5= S5/SMAX, and then the normalized values of the average peak force α and the normalized values of the average displacement β are plotted as a function of the mass ratio of cement to emulsified asphalt in the same coordinate system, as shown in fig. 5. And interpolating to obtain the reasonable dosage ratio of the cement to the emulsified asphalt, namely a =1.7, through the intersection point of the two curves.
Secondly, determining the reasonable dosage b of the composite cementing material
Step 6, manufacturing a cement asphalt composite cementing mixture test piece: based on the proportion a of the reasonable dosage of the cement and the emulsified asphalt determined above, five different dosage of the cementing materials (b 1=3.5%, b2=4.0%, b3=4.5%, b4=5.0%, b5= 5.5%) are taken and mixed with the aggregate with a certain gradation to synthesize the cement-asphalt composite cementing mixture, cement-asphalt composite cementing material test pieces are manufactured by a compaction method, and 8 test pieces are manufactured by each dosage of the composite cementing materials. The curing time is 7 days after the preparation is finished.
Step 7, strength testing: and testing the strength of the test piece reaching the life-preserving period. And averaging the strengths of the 8 test pieces to obtain the average strength of the test pieces under the use amount of each composite cementing material. For example, for a cement asphalt composite cementitious mixture test piece with b1=3.5%, the strength is σ 1-1, σ 1-2, σ 1-3, σ 1-4, σ 1-5, σ 1-6, σ 1-7, and σ 1-8, respectively, and the strength of the test piece is σ 1= (σ 1-1+ σ 1-2+ σ 1-3+ σ 1-4+ σ 1-5+ σ 1-6+ σ 1-7+ σ 1-8)/8. The strength of the test piece with five different cementing agent dosages respectively obtained is sigma 1, sigma 2, sigma 3, sigma 4 and sigma 5.
Step 8, determining the reasonable amount of the composite cementing material: according to the strength test result, the compound cementing material dosage is used as an abscissa, the strength is used as an ordinate, a compound cementing material dosage-strength curve is drawn, and the corresponding minimum cementing material dosage of 4.8 percent is obtained through interpolation according to the curve when the strength is more than or equal to 3.0MPa, namely the reasonable dosage b of the compound cementing material is less than 4.8 percent. As shown in fig. 6.
Claims (7)
1. A material design method of a cement asphalt composite cementing mixture based on crack resistance is characterized by comprising the following steps:
step one, determining the reasonable dosage proportion of cement and emulsified asphalt
Step 1, preparing a cement-emulsified asphalt composite cementing material test piece:
selecting 5 different cement-emulsified asphalt mass ratios to respectively form cement asphalt composite cementing material test pieces;
step 2, preparing a direct tensile test:
firstly, repairing and leveling the top surface of a prefabricated crack of a cement-emulsified asphalt composite cementing material test piece, and then respectively bonding an upper loading plate and a lower loading plate on two sides of the crack of the test piece;
step 3, direct tensile test:
carrying out direct tensile test on the cement-emulsified asphalt composite cementing material test piece;
and 4, processing test results:
respectively drawing a force-displacement curve at the upper pressure head for each test result, and respectively obtaining the peak force of each curve and the displacement corresponding to the peak force;
averaging the peak force and the displacement corresponding to the peak force of the parallel test pieces in the same proportion to obtain the average peak force and the average displacement corresponding to the peak force of the proportion;
step 5, determining the reasonable dosage proportion of the cement and the emulsified asphalt:
normalizing the average peak force and the corresponding average displacement, drawing a curve by taking the mass ratio of the cement to the emulsified asphalt as an abscissa and the normalized value of the average peak force and the average displacement as an ordinate, and interpolating to obtain a reasonable dosage proportion of the cement to the emulsified asphalt through the intersection point of the two curves of the normalized value of the average peak force and the average displacement;
step two, determining the reasonable amount of the composite cementing material
Step 6, manufacturing a cement asphalt composite cementing mixture test piece:
taking different cementing material dosages and mixing the cementing material dosages with aggregate to form a cement asphalt composite cementing mixture on the basis of the reasonable dosage proportion of the cement and the emulsified asphalt determined in the step one, manufacturing a cement asphalt composite cementing material test piece by a compaction method, and curing after the manufacturing is finished;
step 7, strength testing:
testing the strength of the test piece reaching the life-preserving period; averaging the strength of the test piece with the same amount of the composite cementing material to obtain the average strength of the test piece under the amount of each composite cementing material;
step 8, determining the reasonable amount of the composite cementing material:
according to the strength test result, drawing a composite cementing material dosage-strength curve by taking the composite cementing material dosage as an abscissa and the strength as an ordinate, and interpolating through the curve to obtain the corresponding minimum cementing material dosage when the strength is more than or equal to 3.0MPa, namely the reasonable dosage of the composite cementing material.
2. The material design method of the cement asphalt composite cemented mixture based on the crack resistance as set forth in claim 1, characterized in that in the step 1, at least 4 test pieces are molded per formulation.
3. The material design method of the cement asphalt composite cemented mixture based on the crack resistance as set forth in claim 1, characterized in that the concrete steps of the step 1 are as follows:
(1) mixing cement and emulsified asphalt according to a determined proportion, and then pouring into a test mold;
(2) in the pouring process of the test piece, inserting a thin steel sheet into the middle position of the top surface of the test mold, clamping the test mold, taking out the thin steel sheet after the test piece is hardened, and forming a crack on the top surface of the test piece;
(3) and 3d, removing the mold, and then placing the test piece into a curing chamber for curing.
4. The material design method for the cement asphalt composite cemented mixture based on the crack resistance as set forth in claim 3, characterized in that the curing time is 7 d.
5. The material design method of the cement asphalt composite cemented mixture based on the crack resistance as set forth in claim 1, characterized in that the concrete steps of the step 2 are as follows:
fixing a supporting base on a platform of a loading tester, connecting a loading head with an actuator of the loading tester, clamping the lower end of the loading head on a lower loading plate of a test piece, clamping an upper loading plate on the supporting base, and starting the loading tester to load until the test piece is completely broken.
6. The material design method of the cement asphalt composite cemented mixture based on the crack resistance as set forth in claim 1, characterized in that in the step 5, the specific steps of the normalization treatment are as follows:
the 5 average peak forces and the average displacements are divided by the respective maximum values to obtain normalized values of the average peak forces and the average displacements.
7. The material design method for the cement asphalt composite cemented mixture based on the crack resistance as set forth in claim 1, characterized in that in the step 6, at least 8 test pieces are made for each composite cement amount.
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