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Lithium carbonate-halloysite nanotube as well as preparation method and application thereof

A technology of halloysite nanotubes and lithium carbonate, which is applied in the field of concrete mineral admixtures to achieve the effects of reducing damage, easy handling, and improving strength

Pending Publication Date: 2021-09-24
SHENZHEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, countries in the world do not have a method that can radically cure concrete engineering alkali-aggregate reaction damage. The only effective way is to prevent

Method used

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  • Lithium carbonate-halloysite nanotube as well as preparation method and application thereof
  • Lithium carbonate-halloysite nanotube as well as preparation method and application thereof
  • Lithium carbonate-halloysite nanotube as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] With a water-cement ratio of 0.45, a mass ratio of cement to standard sand (mortar ratio) of 1:3, and no addition of lithium carbonate-halloysite nanotubes, cement mortar was prepared, and the ingredients were shown in Table 1; this was used as a control group. Refer to the concrete crack resistance test (circle method) to test the crack resistance of the cement mortar specimens. After the mortar is poured, the time is recorded, and the test records the cracking time of the first specimen and the average cracking of the first 5 specimens. The time and test results are shown in Table 2; with this as the control group, the mechanical performance test was carried out on the cement mortar specimen with reference to the standard GB / T50081-2016 for the test method of mechanical properties of ordinary concrete. The test ages were 3d, 7d, and 28d. The test results See Table 3.

Embodiment 2

[0055] With a water-cement ratio of 0.45 and a mass ratio of cement to standard sand (mortar-sand ratio) of 1:3, lithium carbonate-halloysite nanotubes accounting for 1% of the concrete mass percentage were mixed in to prepare cement mortar. The ingredients are listed in Table 1. Show; With reference to the concrete crack resistance test (circle method), the cement mortar specimen is tested for crack resistance, and the time is recorded after the mortar is poured, and the test records the cracking time of the first specimen and the cracking time of the first 5 specimens. The average cracking time, the test results are shown in Table 2; referring to the standard GB / T50081-2016 for the test method of mechanical properties of ordinary concrete, the mechanical properties of the cement mortar specimens were tested, and the test ages were 3d, 7d, and 28d. The test results are shown in Table 3.

Embodiment 3

[0057] With a water-cement ratio of 0.45 and a mass ratio of cement to standard sand (mortar-sand ratio) of 1:3, lithium carbonate-halloysite nanotubes accounting for 2% of the concrete mass percentage were mixed to prepare cement mortar. The ingredients are listed in Table 1. Show; With reference to the concrete crack resistance test (circle method), the cement mortar specimen is tested for crack resistance, and the time is recorded after the mortar is poured, and the test records the cracking time of the first specimen and the cracking time of the first 5 specimens. The average cracking time, the test results are shown in Table 2; referring to the standard GB / T50081-2016 for the test method of mechanical properties of ordinary concrete, the mechanical properties of the cement mortar specimens were tested, and the test ages were 3d, 7d, and 28d. The test results are shown in Table 3.

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Abstract

The invention discloses a lithium carbonate-halloysite nanotube as well as a preparation method and application thereof. The preparation method comprises the following steps: taking a halloysite nanotube and lithium carbonate as raw materials, and preparing the lithium carbonate-halloysite nanotube by adopting a vacuum impregnation method. The lithium carbonate-halloysite nanotube is added into concrete, Li<+> in the lithium carbonate-halloysite nanotube can be gradually separated out along with cement hydration reaction, and the Li<+> can replace K<+> and Na<+> in slurry to react with silicate substances to generate non-expansive lithium silicic acid gel, so that expansion of a sample is effectively hindered, and the effect of inhibiting the alkali-aggregate reaction of the sample is achieved; CO3<2-> in the lithium carbonate-halloysite nanotube plays a role in curing Ca<2+>, and calcium carbonate is formed in the halloysite nanotube, so that the content of Ca<2+> is reduced, and the damage of carbonate reaction to a matrix is reduced; and the halloysite nanotube can also be used as a reinforcing material to improve the crack resistance and mechanical properties of the concrete.

Description

technical field [0001] The invention relates to the field of concrete mineral admixtures, in particular to a lithium carbonate-halloysite nanotube and a preparation method and application thereof. Background technique [0002] Alkali-aggregate reaction (abbreviated as AAR) refers to the chemical reaction between cement, aggregate, admixture, mixture and alkaline substances (potassium oxide or sodium oxide) in the mixing water and the alkali-active mineral components in the aggregate. , to generate swelling substances (or water-absorbing swelling substances), so that the concrete will gradually generate self-expansion stress inside after several years of pouring, resulting in the damage phenomenon of concrete extending and cracking from the inside to the outside. In my country's concrete engineering, the Xizhimen Overpass in Beijing, which was damaged due to the alkali-aggregate reaction, was demolished in less than one year of operation. The Beijing Sanyuan Bridge project w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B22/10C04B22/08C04B103/60
CPCC04B40/0039C04B22/08C04B22/10C04B2103/603
Inventor 汪峻峰方媛殷小红何克泽林琛鲁刘磊
Owner SHENZHEN UNIV
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