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Preparation method of metakaolin-based magnesium oxide type rapid repair material

A metakaolin-based magnesia technology, which is applied in the field of preparation of metakaolin-based magnesia-type rapid repair materials, can solve the problems of slow strength growth, slow setting and hardening process, and low early strength, and achieve high early strength and initial setting. Shorter time and better work performance

Inactive Publication Date: 2015-03-11
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the above method can alleviate the problem of slow strength growth of concrete structures to a certain extent, it also brings problems such as relatively slow setting and hardening process and low early strength.

Method used

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  • Preparation method of metakaolin-based magnesium oxide type rapid repair material
  • Preparation method of metakaolin-based magnesium oxide type rapid repair material
  • Preparation method of metakaolin-based magnesium oxide type rapid repair material

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Experimental program
Comparison scheme
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Embodiment 1-8

[0031] Embodiment 1-8, the weight ratio of each raw material is shown in Table 1.

[0032] Table 1

[0033]

[0034] Test its expansion degree and coagulation time in advance, and then use a 40mm×40mm×160mm triple test mold to form the sample according to JGJ55-2000. After standing at room temperature for 1 hour, remove the mold, and cure it at room temperature for 3 hours (3h) and 1 day. (1d) After that, test its strength on DKZ-5000 electric cement bending machine and WE-5 hydraulic universal testing machine.

[0035] The interface bonding strength between the quick repair material and the old concrete was measured by the indirect method of flexural strength. Firstly, a 40mm×40mm×160mm cement mortar test block (JGJ55-2000, standard mortar strength test) was prepared, and maintained in water for 28 days. The cement mortar test block is cut horizontally from the middle, and half of it is placed at the bottom of the 40mm×40mm×160mm mold with the section facing up, and then ...

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Abstract

The invention discloses a preparation method of a metakaolin-based magnesium oxide type rapid repair material. The preparation method comprises the following steps: calcining magnesian marble at the temperature of 1200-1500 DEG C for 2-4 hours, naturally cooling to room temperature, and carrying out ball milling to obtain dead burnt magnesium oxide; calcining a kaolin powder at the temperature of 550-800 DEG C for 2-4 hours, cooling to room temperature, and carrying out ball milling to obtain metakaolin; uniformly mixing dead burnt magnesium oxide, metakaolin, fly ash, carbon black and sand in a mixer so as to obtain a solid raw material; uniformly mixing ammonium biphosphate, boric acid and water to obtain a liquid raw material; and uniformly stirring the solid raw material and the liquid raw material in the mixer to obtain the metakaolin-based magnesium oxide type rapid repair material. According to the invention, initial setting time is basically controlled within 15-25 min and is extremely obviously shortened in comparison with 3-4 hours' initial setting time of a common cement-based repair material. A certain amount of waste fly ash can be consumed. The preparation method has advantages of environmental protection, energy conservation and emission reduction.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a preparation method of a metakaolin-based magnesium oxide type quick repair material. Background technique [0002] Cement concrete pavement has good construction performance and excellent durability, and the pavement structure is firm, with good skid resistance and wear resistance, and long service life. Therefore, cement concrete pavement occupies a very important position in my country's road network. However, due to the continuous increase of traffic volume, the lack of pavement design and construction management, and the increase of pavement service life, many cement concrete pavements have been damaged to varying degrees because they cannot withstand the increasingly heavy transport capacity. The commonly used local repair technology for cement substrates is not only complicated in process, but also takes a long time to open to traffic, and the bond...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/34
Inventor 孙涛水中和余风王桂明包明韩金龙周吉陆建鑫
Owner WUHAN UNIV OF TECH
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