CN110862249A - High-fluidity ECC self-healing mortar material and preparation method, performance evaluation method and application thereof - Google Patents
High-fluidity ECC self-healing mortar material and preparation method, performance evaluation method and application thereof Download PDFInfo
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- 238000005452 bending Methods 0.000 claims description 27
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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
- C04B28/04—Portland cements
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C7/00—Coherent pavings made in situ
- E01C7/08—Coherent pavings made in situ made of road-metal and binders
- E01C7/10—Coherent pavings made in situ made of road-metal and binders of road-metal and cement or like binders
- E01C7/12—Mortar-bound paving
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/38—Concrete; Lime; Mortar; Gypsum; Bricks; Ceramics; Glass
- G01N33/383—Concrete or cement
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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
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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
- C04B2111/72—Repairing or restoring existing buildings or building materials
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Abstract
The invention relates to a high-fluidity ECC self-healing mortar material and a preparation method and application thereof, belonging to the technical field of road engineering. The high-fluidity ECC self-healing mortar material provided by the invention comprises the following components in percentage by weight: 20-50% of cement, 10-40% of fly ash, 10-50% of sand, 0.1-5% of a water reducing agent, 0.1-5% of a shrinkage reducing agent, 0.5-1% of a stabilizer, 0.5-1% of an early strength agent, 5-40% of a quick hardening agent, 1-5% of fiber and 5-20% of water. The high-fluidity ECC self-healing mortar material provided by the invention solves the problem of cracking of a semi-flexible pavement, effectively improves the pavement performance of the semi-flexible pavement, makes up for short slab of the semi-flexible pavement material in the aspect of cracking resistance and durability, and further prolongs the service life of road infrastructure.
Description
Technical Field
The invention relates to a high-fluidity ECC self-healing mortar material and a preparation method and application thereof, belonging to the technical field of road engineering.
Background
At present, highway materials in China are mainly divided into two types: cement concrete and asphalt concrete. The cement concrete as rigid material features high strength, high durability and stability, no ageing, but high cost, great environmental pollution and inconvenient later maintenance. The asphalt concrete is a flexible pavement structure and is an environment-friendly material. The method has the advantages of no seam, little pollution, convenient maintenance and the like, but has higher temperature sensitivity, such as: the asphalt concrete pavement is easy to form ruts and pits in a high-temperature environment, and the driving safety is reduced. The road surface is easy to crack in a low-temperature environment, so that the road surface cracks to influence the driving comfort and safety.
The existing research shows that the high-modulus high-wear-resistance material can improve the strength and the service life of a pavement material, but is difficult to bear on an economic level. There is thus still a need for a pavement material which has good properties and is economically reasonable. Obviously, the semi-flexible pavement material with the characteristics of good high-temperature stability, wear resistance, low investment and the like is a suitable choice. The semi-flexible pavement material is a composite material which is formed by taking asphalt mixture as a framework and pouring special cement slurry into the large-gap asphalt mixture. The high-temperature stability of the asphalt pavement is superior to that of an asphalt pavement, and the asphalt pavement also has the characteristics of excellent deformation resistance, water damage resistance, skid resistance and the like of a cement pavement. Meanwhile, the low-temperature crack resistance is superior to that of a cement pavement, and in addition, no joint can be arranged, so that the driving comfort is enhanced.
However, the semi-flexible pavement material adopts cement and asphalt as cementing materials, the strength, the rigidity and the temperature sensitivity of the two materials are greatly different, the problem of cracking caused by uneven deformation under the conditions of temperature and traffic load is the biggest obstacle of development and popularization of the pavement, the repair process of the semi-flexible pavement is complex, the maintenance time is long, and certain influence is caused on the traffic capacity of a maintenance road section during maintenance. Therefore, the method has important significance for solving the cracking problem of the semi-flexible pavement by knowing the cracking reason, mechanism and influencing factors and finding a grouting material with good performance.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides the ECC self-healing mortar material with high fluidity by designing a novel grouting material, so that the pavement performance of the semi-flexible material is effectively improved, short plates of the semi-flexible pavement material in the aspect of cracking resistance and durability are made up, and the service life of road infrastructure is further prolonged.
The invention also aims to provide a preparation method of the high-fluidity ECC self-healing mortar material.
The invention further aims to provide a performance evaluation method of the high-fluidity ECC self-healing mortar material.
The invention further aims to provide application of the high-fluidity ECC self-healing mortar material in semi-flexible pavements.
In order to achieve the purpose, the invention adopts the technical scheme that: the high-fluidity ECC self-healing mortar material comprises the following components in percentage by weight: 20-50% of cement, 10-40% of fly ash, 10-50% of sand, 0.1-5% of a water reducing agent, 0.1-5% of a shrinkage reducing agent, 0.5-1% of a stabilizer, 0.5-1% of an early strength agent, 5-40% of a quick hardening agent, 1-5% of fiber and 5-20% of water.
Preferably, the high-fluidity ECC self-healing mortar material comprises the following components in percentage by weight: 35% of cement, 25% of fly ash, 20% of sand, 0.4% of water reducing agent, 0.6% of shrinkage reducing agent, 1% of stabilizing agent, 1% of early strength agent, 8% of quick hardening agent, 1% of fiber and 8% of water.
Preferably, the high-fluidity ECC self-healing mortar material comprises the following components in percentage by weight: 35% of cement, 25% of fly ash, 20% of sand, 0.4% of water reducing agent, 0.6% of shrinkage reducing agent, 1% of stabilizing agent, 1% of early strength agent, 7% of quick hardening agent, 2% of fiber and 8% of water.
In the high fluidity ECC self-healing mortar material, when the weight percentage of the fibers is 1% or 2%, the weight ratio of the water to the cement is about 0.23, and the high fluidity ECC self-healing mortar material has the largest fluidity and is easy to grout under the matching condition.
The high-fluidity ECC self-healing mortar material provided by the invention has the advantages that the water consumption is low, and as the water consumption is reduced, more unhydrated active substances exist in ECC, and the active mineral substances are subjected to secondary hydration under different environments, so that the self-healing is facilitated.
The high-fluidity ECC self-healing mortar material provided by the invention contains fibers, the fibers have a bridging effect, the area of a crack can be reduced under the bridging effect of the fibers, the fluid effect is reduced, the value of the crack is improved, in addition, the water content in the high-fluidity ECC self-healing mortar material can promote chemical reaction near the fibers, and the self-healing can be promoted by the bridging effect of hydration products and the fibers at the crack.
Preferably, the cement is portland cement, the fly ash is secondary fly ash, the sand is river sand, the water reducing agent is a polycarboxylic acid water reducing agent or a high-efficiency water reducing agent, the shrinkage reducing agent is a SKY shrinkage reducing agent, the stabilizer is cellulose ether, the early strength agent is calcium formate, the quick-hardening agent is amorphous calcium sulphoaluminate, and the fiber is polyvinyl alcohol fiber.
Preferably, the fineness modulus of the river sand is 1.0-1.4; the length of the polyvinyl alcohol fiber is 5-10 mm.
In addition, the invention provides a preparation method of the high-fluidity ECC self-healing mortar material, which comprises the following steps:
(1) weighing the components according to the proportion, and putting the cement, the fly ash, the sand, the water reducing agent, the shrinkage reducing agent, the stabilizing agent, the early strength agent and the quick hardening agent into a stirrer to be stirred to obtain a uniformly mixed mixture;
(2) adding water weighed in the step (1) of 2/3 weight into the mixture in the step (1), stirring for 4 minutes, then adding the rest 1/3 weight of water, stirring for 4 minutes, adding fibers, stirring for 2 minutes, and uniformly dispersing the fibers in slurry to obtain the high-fluidity ECC self-healing mortar material.
As a preferable embodiment of the preparation method of the high fluidity ECC self-healing mortar material of the present invention, in the step (1), the stirring time is 1 minute, and the stirring speed is 150 r/min;
as a preferable embodiment of the preparation method of the ECC self-healing mortar material with high fluidity, in the step (2), the stirring speed is 300r/min
In addition, the invention provides a performance evaluation method of the high-fluidity ECC self-healing mortar material, which comprises the following steps:
(1) taking 3 groups of high-fluidity ECC self-healing mortar materials with the same component content, placing the 3 groups of high-fluidity ECC self-healing mortar materials and a mould in a curing environment for curing, demolding after 1 day, and then placing in a water curing box at 50-60 ℃ for curing; if the high-fluidity ECC self-healing mortar material is slow to harden, the demolding time can be prolonged;
(2) the high fluidity ECC self-healing mortar material of the group 1 is pre-pressed and anti-bending treated after being cured for 7 days, and the maximum anti-bending strength is recorded as R0(ii) a The high fluidity ECC self-healing mortar material of the group 2 is pre-pressed and anti-bending treated after being cured for 7 days, and the range of the press machine is adjusted to 50 percent R0After the prepressing is finished, placing the high fluidity ECC self-healing mortar material in the group 2 in a water curing box at the temperature of 50-60 ℃, and continuing curing for 21 days;
(3) pre-pressing and anti-bending treatment is carried out on the high fluidity ECC self-healing mortar material in the group 3 in the step (1) after 28 days of maintenance, and the maximum anti-bending strength R is recorded1(ii) a Carrying out pre-pressing anti-bending treatment on the 2 nd group of high-fluidity ECC self-healing mortar materials which are cured for 21 days in the step (2), and recording the maximum anti-bending strength R2；R2And R1The ratio of (a) is the self-healing index HI of the high fluidity ECC self-healing mortar material, and when the HI is more than 25%, the high fluidity ECC self-healing mortar material has self-healing performance.
The ECC self-healing mortar material with high fluiditySelf-healing performance evaluation: HI ═ R2/R1And drawing a self-healing index HI curve of the high-fluidity ECC self-healing mortar material under the conditions of different fiber mixing amounts, and considering that the high-fluidity ECC self-healing mortar material has better self-healing performance when HI is more than 25%.
As a preferable embodiment of the method for evaluating the performance of the high-fluidity ECC self-healing mortar material, in the step (1), the length, the width and the height of the 3 groups of high-fluidity ECC self-healing mortar materials are 40mm, 40mm and 160mm respectively, and the curing environment is at a temperature of 20 ℃ and a humidity of more than 80%.
As a preferred embodiment of the performance evaluation method of the high fluidity ECC self-healing mortar material, in the step (2), when the 2 nd group of high fluidity ECC self-healing mortar materials are subjected to pre-pressing and bending-resisting treatment after being cured for 7 days, the loading rate of the 2 nd group of high fluidity ECC self-healing mortar materials on a press is 1mm/min, so that the high fluidity ECC self-healing mortar materials are prevented from being directly cracked, the crack of the 2 nd group of high fluidity ECC self-healing mortar materials after being subjected to pre-pressing and bending-resisting treatment is smaller than 1mm, and the recovery of the mechanical performance of the high fluidity ECC self-healing mortar materials under different temperature and humidity curing conditions is researched.
The performance evaluation of the high fluidity ECC self-healing mortar material shows that the high fluidity ECC self-healing mortar material has good crack control capability, the structural integrity of the high fluidity ECC self-healing mortar material is good due to fibers, the crack width is narrow, and the structural internal stress is redistributed due to continuous generation of new cracks under the bridging action similar to reinforcing steel bars.
As a preferable embodiment of the method for evaluating the performance of the high fluidity ECC self-healing mortar material, in the step (3), in the pre-pressing and anti-bending treatment, the loading rate of the high fluidity ECC self-healing mortar materials in the groups 2 and 3 on the press is 0.5 mm/min.
In addition, the invention also provides application of the high-fluidity ECC self-healing mortar material in a semi-flexible pavement.
Compared with the prior art, the invention has the beneficial effects that:
(1) the high-fluidity ECC self-healing mortar material provided by the invention solves the problem of cracking of a semi-flexible pavement, effectively improves the pavement performance of the semi-flexible pavement, makes up for short slab of the semi-flexible pavement material in the aspect of cracking resistance and durability, and further prolongs the service life of road infrastructure;
(2) compared with the traditional cement-based material, the ECC self-healing mortar material with high fluidity provided by the invention can generate a better self-healing effect;
(3) the high-fluidity ECC self-healing mortar material provided by the invention has less water consumption, and as the water consumption is reduced, more unhydrated active substances exist in ECC, and the active mineral substances are subjected to secondary hydration under different environments, so that the self-healing is facilitated;
(4) the high-fluidity ECC self-healing mortar material provided by the invention contains fibers, the fibers have a bridging effect, the crack area can be reduced under the bridging effect of the fibers, the fluid effect is reduced, and the crack value is improved;
(5) the performance evaluation of the high fluidity ECC self-healing mortar material shows that the high fluidity ECC self-healing mortar material has good crack control capability, the structural integrity of the high fluidity ECC self-healing mortar material is good due to fibers, the crack width is narrow, and the structural internal stress is redistributed due to continuous generation of new cracks under the bridging action similar to reinforcing steel bars.
Drawings
Fig. 1 is a schematic structural view of a funnel: the units of the numbers in the figures are mm;
FIG. 2 is a graph showing the results of fluidity comparison of mortars with different fiber contents;
FIG. 3 is a wet curing box used in curing the ECC mortar material;
FIG. 4 shows a constant temperature water tank used for curing the ECC mortar material.
Detailed Description
To better illustrate the objects, aspects and advantages of the present invention, the present invention will be further described with reference to specific examples.
Example 1
The embodiment of the invention relates to a high-fluidity ECC self-healing mortar material, which comprises the following components in percentage by weight: 35% of portland cement, 25% of secondary fly ash, 20% of river sand (fineness modulus of 1.0), 0.4% of polycarboxylic acid water reducing agent, 0.6% of SKY shrinkage reducing agent, 1% of cellulose ether, 1% of calcium formate, 8% of amorphous calcium sulphoaluminate, 1% of polyvinyl alcohol fiber (length of 5mm) and 8% of water.
The preparation method of the high-fluidity ECC self-healing mortar material comprises the following steps:
(1) weighing the components according to the proportion, respectively putting the portland cement, the secondary fly ash, the river sand (with the fineness modulus of 1.0), the polycarboxylic acid water reducing agent, the shrinkage reducing agent, the cellulose ether, the calcium formate and the amorphous calcium sulphoaluminate into a stirrer for stirring, and stirring at the stirring speed of 150r/min for 1 minute to obtain a uniformly mixed mixture;
(2) adding water weighed in the step (1) of 2/3 weight into the mixture in the step (1), stirring for 4 minutes at a stirring speed of 300r/min, then adding the residual 1/3 weight of water, stirring for 4 minutes at a stirring speed of Y, adding polyvinyl alcohol fibers, stirring for 2 minutes, uniformly dispersing the fibers in slurry, and thus obtaining the high-fluidity ECC self-healing mortar material.
Example 2
The embodiment of the invention relates to a high-fluidity ECC self-healing mortar material, which comprises the following components in percentage by weight: 35% of portland cement, 25% of secondary fly ash, 20% of river sand (fineness modulus of 1.0), 0.4% of polycarboxylic acid water reducing agent, 0.6% of SKY shrinkage reducing agent, 1% of cellulose ether, 1% of calcium formate, 7% of amorphous calcium sulphoaluminate, 2% of polyvinyl alcohol fiber (length of 5mm) and 8% of water.
The preparation method of the high-fluidity ECC self-healing mortar material comprises the following steps: the same as in example 1.
Example 3
The embodiment of the invention relates to a high-fluidity ECC self-healing mortar material, which comprises the following components in percentage by weight: 20% of portland cement, 10% of secondary fly ash, 50% of river sand (fineness modulus of 1.4), 0.1% of polycarboxylic acid water reducing agent, 0.1% of SKY shrinkage reducing agent, 0.5% of cellulose ether, 1% of calcium formate, 10.3% of amorphous calcium sulphoaluminate, 3% of polyvinyl alcohol fiber (length of 10mm) and 5% of water.
The preparation method of the ECC self-healing mortar material with high fluidity is the same as that of the embodiment 1.
Example 4
The embodiment of the invention relates to a high-fluidity ECC self-healing mortar material, which comprises the following components in percentage by weight: 50% of portland cement, 10% of secondary fly ash, 10% of river sand (fineness modulus of 1.3), 5% of a high-efficiency water reducing agent, 5% of a SKY (short-chain Y) shrinkage reducing agent, 1% of cellulose ether, 0.5% of calcium formate, 5% of amorphous calcium sulphoaluminate, 4% of polyvinyl alcohol fiber (length of 6mm) and 9.5% of water.
The preparation method of the ECC self-healing mortar material with high fluidity is the same as that of the embodiment 1.
Example 5
The embodiment of the invention relates to a high-fluidity ECC self-healing mortar material, which comprises the following components in percentage by weight: 20% of portland cement, 40% of secondary fly ash, 20% of river sand (fineness modulus of 1.2), 2% of high-efficiency water reducing agent, 1% of SKY shrinkage reducing agent, 0.6% of cellulose ether, 0.8% of calcium formate, 5% of amorphous calcium sulphoaluminate, 5% of polyvinyl alcohol fiber (length of 8mm) and 5.6% of water.
The preparation method of the ECC self-healing mortar material with high fluidity is the same as that of the embodiment 1.
Comparative example 1
The comparative example is a mortar material, which comprises the following components in percentage by weight: 35% of portland cement, 25% of secondary fly ash, 20% of river sand (fineness modulus of 1.0), 0.4% of polycarboxylic acid water reducing agent, 0.6% of SKY shrinkage reducing agent, 1% of cellulose ether, 1% of calcium formate, 9% of amorphous calcium sulphoaluminate and 8% of water.
Effect example 1
The mortar strength and the flow property thereof are greatly influenced by water and fiber, and tests show that: the incorporation of fibers leads to poor mortar flowability and reduced pourability. Therefore, the water consumption and the fiber mixing amount are determined on the premise of ensuring the flowing property and the strength of the mortar. The semi-flexible road of the Japan road Association is specified by mortar regulations, and the fluidity is measured by a special V-shaped funnel (as shown in FIG. 1), and the standard time of arrival is 12s-18 s. The bore is 178mm on the funnel, and the bore is 13mm down, and outflow pipe is long 38mm, and effective volume 1000ml adopts the stainless steel processing, and the inner wall is smooth to be equipped with the tripod.
The research shows that the fiber mixing amount in the high-performance ECC cement-based material is kept to be 1-3% of the total volume of the mortar. The mortar special for the semi-flexible pavement for the test of the effect example has a water cement ratio of 0.20-0.24, the mortar with the water cement ratio of 0.20, 0.21, 0.22, 0.23 and 0.24 is respectively tested, and the high-fluidity ECC self-healing mortar material (except for the materials with the fiber contents of 1%, 2% and 3%, other components and the preparation method of the material are the same as those in the example 1) of the invention with the fiber contents of 1%, 2% and 3% is added into the mortar for the fluidity test.
As can be seen from FIG. 2, the fluidity of the mortar increases as the water-cement ratio increases; under the same water-cement ratio, the fluidity of the fiber decreases with the increase of the fiber content. When the fiber content reaches 3%, the fluidity of the mortar is high, at the moment, the floccules in the mortar are high, the material does not have good fluidity and cannot meet the filling requirement, when the 1% and 2% fibers are doped, the fluidity value of the mortar meets the requirement, the overall effect is in a flowing water shape, and the good grouting effect is achieved. Therefore, the high-fluidity ECC self-healing mortar material is prepared by selecting 0.23 water-cement ratio and 1% and 2% of fiber mixing amount, and subsequent tests are carried out.
Effect example 2
In the effect example, the self-healing performance of the ECC mortar materials of examples 1 and 2 of the present invention and the mortar material of comparative example 1 were evaluated, and in the effect example, the mortar materials of examples 1 and 2 of the present invention and comparative example 1 were cured in a curing oven at a temperature of 20 ℃ and a humidity of more than 80% for 3, 7, 14, and 28, respectively, and pre-pressed, anti-fracture or anti-compression treatments were performed, and the corresponding anti-fracture or anti-compression strengths were recorded. The flexural strength is shown in Table 1, and the compressive strength is shown in Table 2.
TABLE 1 result of ECC mortar material prepressing and bending resistance under different curing time
As can be seen from Table 1 above, the flexural strength of the ordinary mortar of comparative example 1 and the fiber-doped ECC mortar of examples 1-2 increased with the increase of curing time, and reached about 15MPa in 28 days. The flexural strength of the fiber-doped ECC mortar of examples 1-2 is greater than that of the ordinary mortar of comparative example 1 with the same curing time, and the difference between the flexural strength and the curing time gradually increases. The material has no brittle failure in the anti-fracture test process, cracks are slowly unfolded, the bridging effect of fibers in the test piece is not obvious at the moment, and the anti-fracture strength of the three materials is not greatly different. After 14 days of curing, the strength of the mortar is rapidly increased to about 85% of the strength in 28 days, and after 14 days, the flexural strength of the ECC mortar doped with the fibers in the examples 1-2 is greater than that of the ordinary mortar in the comparative example 1, and the mortar doped with the fibers in the example 2 in a proportion of 2% is greater than that in the example 1 in a proportion of 1%.
The following are found in the test process: the comparative example 1 ordinary mortar not doped with fibers was all brittle and was observed to instantaneously break into two parts during the test. The ECC mortar of the embodiment 1 and the embodiment 2 doped with the fibers is still a whole after loading is finished, but a small crack appears at a stress part, the width is about 0.1mm, and the crack of the ECC mortar doped with 2% of the fibers of the embodiment 2 is slightly smaller than that of the ECC mortar doped with 1% of the fibers of the embodiment 1.
TABLE 2 results of ECC mortar material pre-compaction and compression resistance at different curing times
From table 2 above, it can be seen that: the compressive strength of the ordinary mortar in the comparative example 1 and the ECC mortar doped with fibers in the examples 1-2 is increased along with the increase of the curing time, but the compressive strength values of the ordinary mortar and the ECC mortar doped with fibers are not very different, and the compressive strength requirements of the specifications on pavement materials are met. In addition, the increase of the compressive strength value of the ECC mortar doped with the fibers in the examples 1-2 is mainly 14 days before curing, and the strength value is 85% of the 28-day age strength. However, when the mortar is cured for 3 to 7 days, the compressive strength of the ECC mortar doped with the fibers in the examples 1 to 2 is slightly smaller than that of the common mortar in the comparative example 1.
The following are found in the test process: the fiber is mixed to slow the crack propagation speed when the test piece is damaged under pressure, prolong the damage time and realize ductile damage.
Effect example 3
The effect example is that the ECC mortar material of example 2 of the present invention is placed in three different curing environments, and then the self-healing performance is evaluated, where the evaluation method includes the following steps:
(1) taking 3 groups of high-fluidity ECC self-healing mortar materials which are same in component content, 40mm in length, width and height and 160mm in height, placing the 3 groups of high-fluidity ECC self-healing mortar materials and a mould in a curing environment with the temperature of 20 ℃ and the humidity of more than 80% for curing, demolding after 1 day, and then placing in a 50 ℃ water curing box for curing;
(2) the high fluidity ECC self-healing mortar material of the group 1 is pre-pressed and anti-bending treated after being cured for 7 days, and the maximum anti-bending strength is recorded as R0(ii) a The high fluidity ECC self-healing mortar material of the group 2 is pre-pressed and anti-bending treated after being cured for 7 days, and the range of the press machine is adjusted to 50 percent R0The loading rate is 1mm/min, the crack after prepressing and bending resistance treatment is less than 1mm, after the prepressing is finished, the high fluidity ECC self-healing mortar material of the group 2 is placed in three different curing environments, and is taken out and placed in a room at intervalsContinuously maintaining for 21 days at the temperature;
(3) carrying out prepressing and anti-bending treatment on the high fluidity ECC self-healing mortar material in the group 3 in the step (1) after 28 days of maintenance, wherein the loading rate on a press machine is 0.5mm/min, and recording the maximum anti-bending strength R1(ii) a Carrying out prepressing and anti-bending treatment on the 2 nd group of high-fluidity ECC self-healing mortar materials which are cured for 21 days in the step (2), wherein the loading rate on a press machine is 0.5mm/min, and recording the maximum anti-bending strength R2。
The self-healing performance evaluation of the high-fluidity ECC self-healing mortar material is as follows: HI ═ R2/R1And drawing a self-healing index HI curve of the high-fluidity ECC self-healing mortar material under the conditions of different fiber mixing amounts, and considering that the high-fluidity ECC self-healing mortar material has better self-healing performance when HI is more than 25%.
In the step (2), the three different curing environments are respectively:
and (3) dry air curing: and placing the pretreated high-fluidity ECC self-healing mortar material in dry air, and performing a test when the mortar material is maintained to a specified age, wherein the test is used for simulating the working condition of the crack-carrying member in the actual engineering in a dry environment.
And (3) moist air curing: the high-fluidity ECC self-healing mortar material is placed in a wet curing box for curing, the temperature is 20 ℃, the humidity is 80%, as shown in figure 2, and the test is carried out when the mortar reaches the specified age, so that the high-fluidity ECC self-healing mortar material is used for simulating an environment with much rain all year round.
And (3) maintaining by moist and hot air: the test piece is placed in a water curing box at the temperature of 50-60 ℃, taken out every 12 hours, placed at room temperature, cured to a specified age for testing, and used for simulating a high-temperature and rainy humid environment all year round, as shown in fig. 3.
The experimental results are as follows: the ECC mortar material of the embodiment 2 has the recovery strength of 0.8Mpa and the recovery ratio of 5.3% in a dry air curing environment; under the humid air curing environment, the recovery strength is 2.1Mpa, and the recovery ratio is 14%; under the environment of moist and hot air curing, the recovery strength is 4.1Mpa, 27.3%.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting the protection scope of the present invention, and although the present invention is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.
Claims (10)
1. The high-fluidity ECC self-healing mortar material is characterized by comprising the following components in percentage by weight: 20-50% of cement, 10-40% of fly ash, 10-50% of sand, 0.1-5% of a water reducing agent, 0.1-5% of a shrinkage reducing agent, 0.5-1% of a stabilizer, 0.5-1% of an early strength agent, 5-40% of a quick hardening agent, 1-5% of fiber and 5-20% of water.
2. The high-fluidity ECC self-healing mortar material is characterized by comprising the following components in percentage by weight: 35% of cement, 25% of fly ash, 20% of sand, 0.4% of water reducing agent, 0.6% of shrinkage reducing agent, 1% of stabilizing agent, 1% of early strength agent, 8% of quick hardening agent, 1% of fiber and 8% of water.
3. The high-fluidity ECC self-healing mortar material is characterized by comprising the following components in percentage by weight: 35% of cement, 25% of fly ash, 20% of sand, 0.4% of water reducing agent, 0.6% of shrinkage reducing agent, 1% of stabilizing agent, 1% of early strength agent, 7% of quick hardening agent, 2% of fiber and 8% of water.
4. The high fluidity ECC self-healing mortar material according to any one of claims 1 to 3, wherein the cement is portland cement, the fly ash is secondary fly ash, the sand is river sand, the water reducing agent is a polycarboxylic acid water reducing agent or a high efficiency water reducing agent, the shrinkage reducing agent is SKY shrinkage reducing agent, the stabilizer is cellulose ether, the early strength agent is calcium formate, the quick hardening agent is amorphous calcium sulphoaluminate, and the fiber is polyvinyl alcohol fiber.
5. The high fluidity ECC self-healing mortar material according to claim 4, wherein the fineness modulus of the river sand is 1.0 to 1.4; the length of the polyvinyl alcohol fiber is 5-10 mm.
6. The preparation method of the high fluidity ECC self-healing mortar material according to any one of claims 1 to 5, which comprises the following steps:
(1) weighing the components according to the proportion, and putting the cement, the fly ash, the sand, the water reducing agent, the shrinkage reducing agent, the stabilizing agent, the early strength agent and the quick hardening agent into a stirrer to be stirred to obtain a uniformly mixed mixture;
(2) adding water weighed in the step (1) of 2/3 weight into the mixture in the step (1), stirring for 4 minutes, then adding the rest 1/3 weight of water, stirring for 4 minutes, adding fibers, stirring for 2 minutes, and uniformly dispersing the fibers in slurry to obtain the high-fluidity ECC self-healing mortar material.
7. The method according to claim 6, wherein in the step (1), the stirring time is 1 minute, and the stirring speed is 150 r/min; in the step (2), the stirring speed is 300 r/min.
8. The method for evaluating the performance of the high fluidity ECC self-healing mortar material according to any one of claims 1 to 5, wherein the method for evaluating the performance comprises the following steps:
(1) taking 3 groups of high-fluidity ECC self-healing mortar materials with the same component content, placing the 3 groups of high-fluidity ECC self-healing mortar materials and a mould in a curing environment for curing, demolding after 1 day, and then placing in a water curing box at 50-60 ℃ for curing;
(2) the high fluidity ECC self-healing mortar material of the group 1 is pre-pressed and anti-bending treated after being cured for 7 days, and the maximum anti-bending strength is recorded as R0(ii) a The high fluidity ECC self-healing mortar material of the group 2 is pre-pressed and anti-bending treated after being cured for 7 days, and the range of the press machine is adjusted to 50 percent R0After the prepressing is finished, placing the high fluidity ECC self-healing mortar material in the group 2 in a water curing box at the temperature of 50-60 ℃, and continuing curing for 21 days；
(3) Pre-pressing and anti-bending treatment is carried out on the high fluidity ECC self-healing mortar material in the group 3 in the step (1) after 28 days of maintenance, and the maximum anti-bending strength R is recorded1(ii) a Carrying out pre-pressing anti-bending treatment on the 2 nd group of high-fluidity ECC self-healing mortar materials which are cured for 21 days in the step (2), and recording the maximum anti-bending strength R2；R2And R1The ratio of (a) is the self-healing index HI of the high fluidity ECC self-healing mortar material, and when the HI is more than 25%, the high fluidity ECC self-healing mortar material has self-healing performance.
9. The performance evaluation method according to claim 8, wherein in the step (1), the 3 sets of the high fluidity ECC self-healing mortar material have a length, a width and a height of 40mm, 40mm and 160mm respectively, and the curing environment is at a temperature of 20 ℃ and a humidity of more than 80%; in the step (2), when the 2 nd group of high fluidity ECC self-healing mortar materials are subjected to prepressing and bending resistance treatment after being cured for 7 days, the loading rate of the 2 nd group of high fluidity ECC self-healing mortar materials on a press machine is 1mm/min, and the crack of the 2 nd group of high fluidity ECC self-healing mortar materials after being subjected to prepressing and bending resistance treatment is less than 1 mm; in the step (3), in the pre-pressing and anti-bending treatment, the loading rate of the 2 nd group and the 3 rd group high fluidity ECC self-healing mortar material on the press machine is 0.5 mm/min.
10. Use of the high fluidity ECC self-healing mortar material according to any one of claims 1 to 5 in a semi-flexible pavement.
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