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Test method for researching concrete crack chemical excitation healing

A test method and concrete technology, applied in the direction of applying stable tension/pressure to test the strength of materials, scientific instruments, preparation of test samples, etc., to achieve accurate experimental conclusions and remove error factors

Inactive Publication Date: 2019-09-10
NANHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the field of concrete self-healing research, while using SO 4 2- There are few studies on improving the self-healing performance of concrete cracks by environmental curing and adding MgO expansion agent

Method used

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  • Test method for researching concrete crack chemical excitation healing
  • Test method for researching concrete crack chemical excitation healing
  • Test method for researching concrete crack chemical excitation healing

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] A chemically stimulated healing test method for studying concrete cracks, the test method comprising:

[0033] (1) Material preparation: The experimental materials include P.O32.5 Portland cement for cement, ordinary river sand for fine aggregate, crushed stone with a particle size of 10-22mm for coarse aggregate, tap water for mixing, and MgO for analysis. Pure MgO, Na 2 SO 4 For analytically pure anhydrous Na 2 SO 4 ;

[0034](2) Test block preparation: the test design prepares C25 concrete with different MgO (0%, 4%, 8%, 12%) content, the size is 150mm × 150mm × 150mm, after making the test block according to the concrete experiment specification, place Enter the standard curing room for 28 days of curing, put the test block after standard curing for 28 days under the TYE-600E pressure testing machine, adjust the pressure bearing surface to be perpendicular to the top surface of the test block when it is formed, and align the center of the pressure bearing surfac...

Embodiment 2

[0054] A chemically stimulated healing test method for studying concrete cracks, the test method comprising:

[0055] (1) Material preparation: The experimental materials include P.O32.5 Portland cement for cement, ordinary river sand for fine aggregate, crushed stone with a particle size of 10-22mm for coarse aggregate, tap water for mixing, and MgO for analysis. Pure MgO, Na 2 SO 4 For analytically pure anhydrous Na 2 SO 4 ;

[0056] (2) Test block preparation: The test design prepares C25 ordinary concrete without MgO, the size of which is 150mm×150mm×150mm. After the test block is made according to the concrete experiment specification, it is placed in the standard curing room for 28 days. The curing conditions in the standard curing room are: The temperature is (20±1)°C, the humidity is 96%, put the test block after standard curing for 28 days under the TYE-600E pressure testing machine, adjust the pressure-bearing surface to be perpendicular to the top surface of the...

Embodiment 3

[0072] A chemically stimulated healing test method for studying concrete cracks, the test method comprising:

[0073] (1) Material preparation: experimental materials include cement, fine aggregate, coarse aggregate, mixing water, MgO is analytically pure MgO, Na 2 SO 4 For analytically pure anhydrous Na 2 SO 4 ;

[0074] (2) Test block preparation: the test design prepares C25 concrete with different MgO (0%, 4%, 8%, 12%) content, the size is 150mm × 150mm × 150mm, after making the test block according to the concrete experiment specification, place Enter the standard curing room for curing for 28 days. The curing conditions in the standard curing room are temperature (20±1)°C and humidity 96%. Put the test block after standard curing for 28 days under the TYE-600E pressure testing machine, and adjust the pressure bearing surface and The top surface of the test block is vertical when it is formed, and the center of the pressure-bearing surface is aligned with the center o...

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Abstract

The invention discloses a test method for researching concrete crack chemical excitation healing. The test method comprises the steps of: material preparation; test block preparation; mechanics performance testing; ultrasonic wave velocity testing; and experiment conclusion analysis. Cracks are prefabricated for the magnesium oxide concrete test blocks with different mixing amounts, the maintenance test is performed in sodium sulfate solutions with different concentrations, the rebound wave velocities of the test blocks with the cracks are measured by utilizing an ultrasonic comprehensive rebound method, the wave velocities and the compressive strength change of the test blocks at different maintenance ages are contrastively analyzed, the chemical excitation effect of the magnesium oxide and the sodium sulfate on the self-healing performance of the concrete cracks is researched, and the obtained experimental conclusion provides theoretical reference for the application and developmentof the chemical excitation healing of the concrete cracks in engineering.

Description

technical field [0001] The invention relates to the field of building materials, in particular to a chemically stimulated healing test method for researching concrete cracks. Background technique [0002] In the development and construction of today's society, concrete materials are widely used in construction projects due to their advantages of convenient materials and low prices. However, due to the shortcomings of low tensile strength and easy cracking of concrete materials, concrete cracks have become one of the widespread diseases in concrete structures. Traditional repair methods such as surface repair and chemical grouting are difficult to effectively repair internal micro-cracks. Regarding the repair of concrete cracks, scholars at home and abroad have done a lot of research on concrete self-healing technology. Chai Peng and other studies have shown that concrete cracks have a certain self-healing ability in wet conditions or in water. Studies by Liu Surui et al. h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/08G01N29/07G01N1/28
CPCG01N1/28G01N3/08G01N29/07G01N2203/0676G01N2291/0232
Inventor 彭成朱武俊樊军伟郭庆梅夏清陈国梁欧阳曾辉
Owner NANHUA UNIV
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