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Nanometer Al2O3-Ca<2+>-based metakaolin geopolymer road repairing material

An al2o3-ca2, road repair technology, applied in cement production and other directions, can solve the problems of repairing surface layer shedding, long time to form strength, poor mechanical properties, etc. Excellent grinding effect

Inactive Publication Date: 2019-05-28
NORTHEAST FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Existing road repair materials generally have the characteristics of long time for open traffic, long time for strength formation, high requirements for surface crack repair technology, and poor interface bonding performance.
In particular, the existing portland cement road repair materials have poor mechanical properties in the early stage, and the early opening of traffic is likely to cause the repair surface to fall off, and the actual application effect of the project is poor
Many researchers often improve a certain performance by adding admixtures or new composite materials. It is a big challenge to take into account various factors to make repair materials perform well in terms of mechanical properties, repair effects and construction difficulty. challenge
Nano Al 2 o 3 -Ca 2+ The metakaolin-based geopolymer road repair material has micro-swellability, good interfacial bonding performance and early strength, and can be used for grouting and excavation repairs, which can well solve the problem of single performance of existing repair materials

Method used

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  • Nanometer Al2O3-Ca&lt;2+&gt;-based metakaolin geopolymer road repairing material
  • Nanometer Al2O3-Ca&lt;2+&gt;-based metakaolin geopolymer road repairing material
  • Nanometer Al2O3-Ca&lt;2+&gt;-based metakaolin geopolymer road repairing material

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] In this embodiment, XRF (X-ray fluorescence spectrometry) method is used to analyze the main chemical components of metakaolin as shown in Table 1.

[0017] Table 1 Chemical composition of metakaolin

[0018] main ingredient

Embodiment 2

[0020] In this example, experiments were carried out on different proportions of metakaolin land polymer road repair materials. The size of the test block used in this embodiment is 40mm × 40mm × 160mm test pieces, three test pieces for each group, using the orthogonal experiment method with water-cement ratio, sodium hydroxide, sodium silicate as factors, carried out a total of 16 groups of tests, as shown in Table 2.

[0021] Table 2 Test composition and results

[0022]

[0023] The test results show that the early compressive strength is the best when the water-binder ratio is 0.3, the mass fraction of sodium hydroxide is 0.05, and the mass fraction of sodium silicate is 0.10. Therefore, the basic test formula of metakaolin geopolymer is distilled water / sodium hydroxide / sodium silicate / metakaolin=6:1:2:17.

Embodiment 3

[0025] In this embodiment, the curing temperature is compared with the test (the humidity is 95%, and the time is 12h). The size of the test block used in this embodiment is a test piece of 40mm×40mm×160mm. There are three test pieces in each group, and a total of 5 groups are carried out. Test, the test components are the same as test 1, and the test results are shown in Table 3.

[0026] Table 3 Experimental results

[0027] Test serial number

[0028] It can be seen from the test results that high temperature is beneficial to the development of early strength of metakaolin geopolymer road repair materials, and the optimum curing temperature is 60°C.

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Abstract

The invention discloses a nanometer Al2O3-Ca<2+>-based metakaolin geopolymer road repairing material. A formula comprises nanometer Al2O3, Ca(OH)2, calcined kaolin, sodium silicate, sodium hydroxide and distilled water according to a mass ratio of 0.02 to 0.1 to 1 to 0.1 to 0.05 to 0.3. A metakaolin geopolymer has good interfacial bond property and excellent durability and heat resistance, can beused for well repairing cracks and pit slots on a road, and can improve the service life of the road repairing material. Tests show that by adding the Ca(OH)2 into the metakaolin geopolymer, the setting time of the road repairing material can be shortened, and by adding the Al2O3, the compressive strength of the road repairing material can be obviously increased. The 1d compressive strength of theroad repairing material can reach 31 MPa; the initial and final setting time of the road repairing material is respectively 60 min and 295 min; the mechanical property is excellent; and the road repairing material can replace cement as a new green building material to a certain extent, and has a good application prospect.

Description

technical field [0001] The invention belongs to the technical field of road building materials, in particular to a nano-Al 2 o 3 -Ca 2+ Kaolin-based geopolymer road repair material. Background technique [0002] At the end of the 19th century and the beginning of the 20th century, a large number of highways and urban roads were built in my country. With the passage of time and the effect of vehicle loads, the road surface was damaged to varying degrees. Grouting technology has been widely used in highway engineering because of its advantages of convenient construction, technical feasibility and good social benefits. As an important building material, cement has obvious disadvantages of high pollution and high energy consumption. With the proposal of sustainable development and green economy, it has become a new scientific research topic to find a material that can replace cement. As a natural product, kaolin is widely distributed in the world, and it has the effect of re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/00C04B111/72
CPCY02P40/10
Inventor 王宏光何垚赵佳宁
Owner NORTHEAST FORESTRY UNIVERSITY
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