Brucite fiber paste used for toughening cement-based materials and preparation method thereof

A cement-based material and brucite fiber technology, which is applied in the field of cement-based material toughening materials, can solve problems such as the difficulty of applying liquid water reducing agents, and achieve the effect of facilitating fiber toughening and reducing production efficiency

Inactive Publication Date: 2012-10-17
CHANGAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the limitation of equipment conditions, it is difficult to apply liquid water reducer and other admixtures with a small amount in concrete preparation on site, which is not conducive to the improvement of concrete performance.

Method used

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  • Brucite fiber paste used for toughening cement-based materials and preparation method thereof
  • Brucite fiber paste used for toughening cement-based materials and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Add grade 7 brucite fiber, naphthalene-based high-efficiency water reducer and tap water into a forced mechanical mixer at a mass ratio of 1:0.25:0.75, stir for 10 minutes to obtain brucite fiber paste, and keep it sealed for 24 hours for later use.

[0019] Change P.0.42.5 # Ordinary Portland cement, river sand with a fineness modulus of 2.8 and continuously graded limestone gravel with a particle size of 4.75-31.5 mm, tap water and brucite fiber paste are put into a forced concrete mixer and stirred for 3 minutes to obtain freshly mixed brucite Fiber concrete material. The amount of cement is 350Kg / M 3 , water-cement ratio 0.38 (water in brucite fiber paste), sand rate 0.37. The amount of brucite fiber paste is 8% of the cement amount.

[0020] For comparison, under the same raw materials and dosage, the brucite fiber paste is replaced with brucite dry fiber and naphthalene-based high-efficiency superplasticizer dry powder, and the relative dosage of fiber and wate...

Embodiment 2

[0028] Add grade 6 brucite fiber, sulfamate high-efficiency superplasticizer with a solid content of 27%, retarder ethylene glycol and tap water into a forced mechanical mixer at a mass ratio of 1:1.2:0.01:0.29, and stir for 15 minutes to obtain Brucite fiber paste, airtight and stand for 24 hours for later use.

[0029] With the same cement of embodiment 1, sand, crushed stone, tap water, drop into the forced concrete mixer simultaneously with this example brucite fiber paste and stir for 2.5 minutes, obtain the freshly mixed brucite fiber concrete material. The dosage of brucite fiber paste is 10% of the cement dosage. The measured fresh concrete slump is 40mm, the 28d compressive strength is 7.1MPa, the 28d flexural strength is 44.7MPa, and the compressive / flexural strength ratio is 6.3.

Embodiment 3

[0031] Add grade 7 brucite fiber, grade 6 brucite fiber, aliphatic high-efficiency water reducer with a solid content of 35%, waterproofing agent ferric chloride and tap water into the compulsory formula at a mass ratio of 0.8:0.2:0.8:0.85:0.35 In a mechanical mixer, stir for 10 minutes to obtain brucite fiber paste, and keep it airtight for 24 hours for later use.

[0032] With the cement identical with embodiment 1, sand, crushed stone, tap water, drop into the forced concrete mixer simultaneously with this example brucite fiber paste and stir for 4 minutes, obtain freshly mixed brucite fiber concrete material. The consumption of brucite fiber paste is 12% of the cement consumption. The measured fresh concrete slump is 30mm, the 28d compressive strength is 44.8MPa, the 28d flexural strength is 7.6MPa, and the compressive / flexural strength ratio is 5.9.

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Abstract

The invention relates to brucite fiber paste used for toughening cement-based materials and a preparation method thereof. The brucite fiber paste comprises natural brucite fibers, water reducing agents and water in a weight ratio of 1:(0.2-1.2):(0.15-0.75), wherein, the natural brucite fiber is of grade 6 or 7. The preparation method is characterized by adding the above raw materials into a forced mechanical mixer to be mixed and stirred for 5-15min and then placing the mixture for more than 24h in an airtight mode. The brucite fiber paste is used in cement concrete as a toughening material. The usage of the brucite fiber paste in the cement concrete is 5-15% of that of the cement. The brucite fiber paste and other raw materials are simultaneously added into the mixer while the cement concrete is blended, and are mixed for 2-4min. The brucite fiber paste is used for the concrete, enjoys good fiber split property, good construction technological property and low cost, is easily dispersed in the concrete, can avoid dust fly while the concrete is blended and ensures obvious fiber toughening effect.

Description

technical field [0001] The invention relates to a cement-based material toughening material, in particular to a cement-based material toughened brucite fiber paste and a preparation method thereof. Background technique [0002] Cement concrete is a brittle material. It has low tensile capacity, low flexural strength, poor deformation performance, and it is difficult to suppress the initiation and expansion of cracks. Once overloaded, the concrete will crack. Especially high-strength concrete and high-grade high-performance concrete are more brittle. Therefore, improving the flexural strength and toughness of cement concrete to prolong the service life of concrete is a very important research direction of cement concrete materials. [0003] Introducing reinforcing fibers into concrete components to make fiber-reinforced concrete composites is one of the effective measures to improve the toughness and flexural strength of concrete. It can embody the characteristics of high...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B14/38
Inventor 刘开平钟佳墙王振军张艳关博文张晓旭王尉和孙志华温久然
Owner CHANGAN UNIV
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