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Polypropylene fiber reinforced red mud-based geopolymer material and preparation method thereof

A technology of polypropylene fiber and polymer materials, applied in cement production, etc., can solve the problems of low toughness, low flexural strength, and large drying shrinkage of polymers, and achieve enhanced toughness, environmentally friendly preparation process, and brittle failure under pressure The effect of improving the situation

Active Publication Date: 2021-06-18
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problems of low toughness, low flexural strength and large drying shrinkage of the red mud base polymer, the present invention provides a polypropylene fiber reinforced red mud base polymer material and its preparation method

Method used

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  • Polypropylene fiber reinforced red mud-based geopolymer material and preparation method thereof
  • Polypropylene fiber reinforced red mud-based geopolymer material and preparation method thereof
  • Polypropylene fiber reinforced red mud-based geopolymer material and preparation method thereof

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preparation example Construction

[0032] The preparation method of polypropylene fiber reinforced red mud base polymer material provided by the invention comprises the following steps:

[0033] (1) Use the high-speed gas generated by the high-pressure air gun to fully blow the agglomerated polypropylene fibers;

[0034] (2) Accurately weigh the Bayer process red mud and coal-based metakaolin according to the parts by weight, add them to the mortar mixer and stir for 2 minutes, add polypropylene fibers, and stir for 2 minutes. After the fibers are evenly dispersed, add the alkali activator and continue stirring for 3 minutes , forming a uniformly mixed fiber-reinforced geopolymer slurry;

[0035] (3) Pouring the fiber-reinforced geopolymer slurry into a 40mm×40mm×160mm steel mold, vibrating it on a vibrating table for 1min, then sealing the mold with plastic wrap and curing it at room temperature for 24 hours before demoulding;

[0036] (4) Put the demoulded fiber-reinforced geopolymer in a standard curing box...

Embodiment 1

[0042] Formula: prepare 700 parts of Bayer process red mud, 300 parts of coal series metakaolin, 70 parts of distilled water, 80 parts of sodium hydroxide, 640 parts of water glass solution, and 4 parts of polypropylene fiber. Among them, the length of the polypropylene fiber is 9mm.

[0043] Prepare the sample: Pour the mixture of Bayer process red mud and coal-based metakaolin into a mortar mixer and mix thoroughly for 2 minutes; add dispersed polypropylene fibers and stir for 2 minutes, then add alkali activator, stir for 3 minutes, and rotate at 150r / min. A uniformly mixed slurry is formed, and the slurry is packed into a steel mold of 40mm×40mm×160mm. Vibrate on a mortar vibrating table, level off with a scraper, and stand at room temperature for 24 hours to form a geopolymer cementitious material.

Embodiment 2

[0045] Formula: Prepare 700 parts of Bayer process red mud, 300 parts of coal series metakaolin, 70 parts of distilled water, 80 parts of sodium hydroxide, 640 parts of water glass solution, and 6 parts of polypropylene fiber. Among them, the length of the polypropylene fiber is 12mm.

[0046] The test block preparation and testing process are the same as in Example 1.

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Abstract

The invention relates to the field of red mud-based geopolymer materials in building materials, in particular to a polypropylene fiber reinforced red mud-based geopolymer material and a preparation method thereof. The geopolymer material is prepared from the following raw materials in parts by weight: 600-800 parts of Bayer process red mud, 200-400 parts of coal series metakaolin, 750-850 parts of an alkali activator and 2-8 parts of polypropylene fibers. The length of the polypropylene fiber is larger than or equal to 6 mm, and the diameter of the polypropylene fiber is 30-35 microns. The key problems that the red mud-based geopolymer is low in breaking strength, small in toughness, large in drying shrinkage and the like are solved. Due to the bridging capability of the polypropylene fiber and the firm bonding of the polypropylene fiber and a geopolymer matrix, the highest breaking strength and the compressive brittle failure condition of the prepared fiber-reinforced geopolymer material are remarkably improved, the toughness is enhanced, and obvious residual strength exists; and the 90d drying shrinkage is reduced.

Description

technical field [0001] The invention relates to the field of red mud-based polymer materials in building materials, in particular to a polypropylene fiber reinforced red mud-based polymer material and a preparation method thereof. Background technique [0002] Red mud is an industrial waste discharged during the production of alumina, named for its red mud shape. According to statistics, for every ton of alumina produced, 1 to 2 tons of red mud will be produced. At present, the cumulative discharge of red mud in the world has exceeded 2.7 billion tons. Due to the high alkalinity and heavy metal content in red mud, its utilization rate has been low. Geopolymer is a new type of inorganic gelling material formed by the reaction of alkali activator and aluminosilicate raw material. Using red mud as raw material to prepare red mud base polymer is one of the most effective ways to solve red mud accumulation. However, like most ceramic materials, red mud-based polymers have majo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/00C04B12/00
CPCC04B28/006C04B12/005C04B2201/50C04B16/0633Y02P40/10
Inventor 郭天天白晓红高黎明马富丽李婕黄占芳韩鹏举申攀王瑞杰
Owner TAIYUAN UNIV OF TECH
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