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A method of using formamide-double metal hydroxide as concrete early strength agent

A hydroxide, formamide technology, applied in the field of concrete early strength agent, formamide-double metal hydroxide, double metal hydroxide, can solve the problems of reduced early strength performance, LDH nanosheet aggregation, etc. Early strength, early growth-promoting effect

Active Publication Date: 2021-11-23
QINGDAO UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Solve the problem that the LDH nanosheets in the aqueous dispersion will aggregate as the storage time prolongs, resulting in a decrease in its early strength performance

Method used

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  • A method of using formamide-double metal hydroxide as concrete early strength agent
  • A method of using formamide-double metal hydroxide as concrete early strength agent
  • A method of using formamide-double metal hydroxide as concrete early strength agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The concrete processing steps of the present embodiment are:

[0020] (1), Mg(NO 3 ) 2 and Al(NO 3 ) 3 Dissolve in 50ml of deionized water to prepare a mixed salt solution with a total concentration of metal ions of 0.2mol / l; the ratio of the amount of Mg to Al is 2:1; prepare 50ml of ammonia solution with a mass concentration of 7%;

[0021] (2), using the common co-precipitation method, drop the ammonia solution into the mixed salt solution, and fully stir for 30 minutes; the reaction temperature is 30°C;

[0022] (3) Continue stirring the precipitate at 30°C for 2 hours, centrifuge at 8000rpm for 3 minutes, wash with deionized water and dry at 60°C;

[0023] (4) Take 1 g of dried LDH and disperse it in 15 mL of formamide, observe and observe a gel-like substance after ultrasonication for 30 minutes;

[0024] (5) Take 0.32g of the above-mentioned LDH formamide stripped product and 1.44g of water for 3 minutes, then add 4g of ordinary Portland cement P.O.42.5 and ...

Embodiment 2

[0028] The concrete processing steps of the present embodiment are:

[0029] (1), Mg(NO 3 ) 2 and Al(NO 3 ) 3 Dissolve in 50ml of deionized water to prepare a mixed salt solution with a total concentration of metal ions of 1.0mol / l; the ratio of the amount of Mg to Al is 2:1; prepare 50ml of ammonia solution with a mass concentration of 7%;

[0030] (2), using the common co-precipitation method, drip the ammonia solution into the mixed salt solution, and fully stir for 30 minutes; the reaction temperature is 25 ° C;

[0031] (3), continue to stir the precipitate at 40°C for 2 hours, centrifuge at 8000rpm for 3 minutes, wash with deionized water and dry at 60°C;

[0032] (4) Take 1 g of dried MgAl-LDH and disperse it in 15 mL of formamide, observe and find a gel-like substance after ultrasonication for 30 minutes;

[0033] (5) Take 0.32g of the above-mentioned MgAl-LDH formamide stripped product and 1.44g of water for ultrasonication for 3 minutes, then add 4g of ordinary ...

Embodiment 3

[0037] (1), Mg(NO 3 ) 2 and Al(NO 3 ) 3 Dissolve in 50ml of deionized water to prepare a mixed salt solution with a total concentration of metal ions of 0.2mol / l; the ratio of the amount of Mg to Al is 3:1; prepare 50ml of ammonia solution with a mass concentration of 7%;

[0038] (2), using the common co-precipitation method, drop the ammonia solution into the mixed salt solution, and fully stir for 30 minutes; the reaction temperature is 30°C;

[0039] (3) Continue stirring the precipitate at 160°C for 2 hours, centrifuge at 8000rpm for 3 minutes, wash with deionized water and dry at 60°C;

[0040] (4) Take 1 g of dried LDH and disperse it in 30 mL of formamide, observe and observe a gel-like substance after ultrasonication for 30 minutes;

[0041] (5) Take 0.96g of the above-mentioned LDH formamide stripped product and 0.80g of water for ultrasonication for 3 minutes, then add 4g of ordinary Portland cement P.O.42.5 and mix well;

[0042] (6), the mixture in (5) is pla...

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Abstract

The invention discloses a method for using formamide-double metal hydroxide as a concrete early strength agent, and belongs to the technical field of inorganic non-metallic materials. Firstly, layered double hydroxides (LDHs) were dispersed in formamide by ultrasonic to obtain ultra-thin LDHs uniformly and stably dispersed in formamide. The ultra-thin LDHs and water were ultrasonically mixed, and then added to cement and mixed evenly. The present invention finds that using formamide to exfoliate LDH can make its aggregated sheet structure into a highly dispersed ultra-thin sheet structure, and the ultra-thin sheet is stable in the mixed solution of formamide and water, and is not easy to agglomerate. Under the dual effects of amide synergistic promotion and high dispersion, it promotes the improvement of its early strength performance.

Description

Technical field: [0001] The invention belongs to the technical field of inorganic non-metallic materials, and relates to a double metal hydroxide capable of improving the early strength of cement, in particular to a method for using formamide-double metal hydroxide as a concrete early strength agent. Background technique: [0002] Cement concrete products are products suitable for large-scale industrial production, which can avoid problems such as environmental pollution caused by on-site pouring and difficult control of engineering quality. In order to improve production efficiency, cement concrete needs to have good strength in a short period of time, and the early strength agent can be added to the prefabricated component concrete to achieve a good early strength effect. Among the existing accelerators, the addition of inorganic accelerators will destroy the surface structure of concrete and reduce the durability of concrete and its products. Organic early-strength agent...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B24/12C04B28/04C04B103/10
CPCC04B28/04C04B40/0039C04B2103/10C04B22/06C04B24/124C04B22/066C04B22/064
Inventor 庞秀江袁衍广李少香陈利
Owner QINGDAO UNIV OF SCI & TECH
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