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Self-healing effect evaluation method of self-healing cement-based materials

A technology for cement-based materials and evaluation methods, which is applied in the application of stable tension/pressure to test the strength of materials and the preparation of samples for testing, which can solve the lack of direct improvement in material stiffness, toughness, impermeability, erosion resistance and durability. Effective evaluation methods, single repair efficiency evaluation methods, etc.

Inactive Publication Date: 2017-11-28
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are still many unresolved problems in the evaluation of the self-healing effect
The repair efficiency evaluation method for self-repair of cement-based materials is relatively simple. Most of the evaluation methods at home and abroad are limited to the mechanical properties such as the compressive strength recovery rate of the material. The implementation method is loading-unloading repair-secondary loading
There is a lack of direct and effective evaluation methods for evaluating material stiffness, toughness, fracture behavior, constitutive behavior, damage, and impermeability, erosion resistance, carbonization, and other related durability improvements.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1 and 2

[0096] Both Examples 1 and 2 use microcapsule self-healing cement-based materials.

[0097] Firstly, microcapsules with self-healing properties were prepared. The ratio of the mass of the microcapsule particles to the total mass of the finished microcapsule (ie, the microcapsule emulsion system) is the solid content of the microcapsule. The solid content of the microcapsules in Examples 1 and 2 is 40%. The ratio of raw materials is as shown in Table 1:

[0098] Table 1:

[0099] raw material

[0100] potassium persulfate

[0101] The preparation process is as follows:

[0102] (1) take each component material by proportioning;

[0103] (2) Add the epoxy resin diluted with benzyl alcohol as a diluent into a bucket container, stir and dilute;

[0104] (3) Sodium dodecylbenzene sulfonate is used as emulsifier, and octylphenylpolyethylene oxide is used as surfactant, both are mixed with deionized water, after stirring and dispersing for 8 minutes, join in ...

test approach 1

[0113] The test method of embodiment 1 and 2 is consistent, and concrete steps are as follows:

[0114] (1) prepare sample according to sample preparation scheme described in the present invention, each test group prepares 9 specimens, wherein 3 specimens are used for testing reference strength, and other 6 specimens are used for setting different degrees of pre-destruction;

[0115] (2) After the test piece reaches its age, cut a crack with a length of 40mm, a width of 0.5mm, and a depth of 10mm on the side;

[0116] (3) Carry out three-point flexural tests on 3 test pieces of each test group, measure the flexural strength of the samples under different curing conditions with different dosages, and take the average value of the three test data for the final data;

[0117] (4) Carry out different degrees of pre-destruction to the other 6 specimens of each test group according to the method provided in the technical scheme, that is, the aforementioned summary of the invention, ...

Embodiment 3 and 4

[0133] Examples 3 and 4 both use mineral self-healing cement-based materials.

[0134] Both Examples 3 and 4 use a 40mm×40mm×160mm concrete test block to characterize the change of the internal damage degree of the material after mineral self-repair.

[0135] Firstly, concrete materials with mineral self-healing properties are prepared. In Examples 3 and 4, the cementitious material is P O4 2.5 ordinary portland cement; the fine aggregate is river sand, and the fineness modulus is 2.2; the coarse aggregate is continuously graded from 5mm to 25mm; the expansion agent is UEA expansion agent; water reducer using polycarboxylate water reducer. The ratio of raw materials is as shown in Table 5:

[0136] table 5:

[0137]

[0138] After the test pieces were formed, Example 3 was placed in a concrete standard curing room for 28 days, and Example 4 was placed in an aqueous calcium hydroxide solution for 28 days.

[0139] The test method of embodiment 3 and 4 is consistent, and ...

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Abstract

The invention relates to the field of methods for testing or analyzing concrete by means of measuring chemical or physical properties of materials, in particular to a method for evaluating self-repairing effects of self-repairing cement-based materials. A self-healing effect evaluation method for self-healing cement-based materials, characterized in that: evaluation indicators include relative dynamic elastic modulus, fracture behavior (stress intensity factor recovery rate, fracture toughness recovery rate), constitutive behavior comparison, bending resistance Stiffness recovery rate and strength recovery rate. Follow the steps below: Step 1: Prepare specimen; Step 2: Prefabricate local cracks and scattered cracks; Step 3: Test various parameters; Step 4: Complete self-repair; Step 5: Test various parameters; Step 6: Calculate Treatment and evaluation of restoration effects. The present invention is comprehensively evaluated.

Description

technical field [0001] The invention relates to the field of methods for testing or analyzing concrete by means of determining the chemical or physical properties of the material, in particular one. Background technique [0002] As the most widely used material in the field of construction today, the service life of concrete depends largely on its damage. In recent years, with the research and application of smart materials, smart concrete with functions such as self-sensing, self-diagnosis, and self-repair has received extensive attention and research. Self-healing concrete has become an important part of smart structures. It can solve technical problems that cannot be solved or are difficult to solve with traditional crack repair methods. It is very important to ensure the durability and safety of groundwater systems, high-rise buildings, dams and other major civil engineering facilities. In addition, it also has great application prospects in alleviating climate impact d...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N3/12G01N1/28
Inventor 蒋正武赵楠李文婷
Owner TONGJI UNIV
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