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An ultra-high performance cement-based composite material based on cellulose fiber internal curing and its preparation method

A cellulose fiber, ultra-high-performance technology, applied in the field of building materials or basic engineering construction, to achieve improved flexural strength, enhanced waterproof performance and durability, and easy-to-obtain effects

Active Publication Date: 2019-03-19
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

How to scientifically design the internal curing ultra-high performance cement-based composite material and its preparation process that meets the above technical requirements is the innovation point of this patent, which cannot be designed by referring to other existing internal curing materials and internal curing cement-based composite materials The goal that can be achieved by deduction or experimentation of the method and preparation process

Method used

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  • An ultra-high performance cement-based composite material based on cellulose fiber internal curing and its preparation method
  • An ultra-high performance cement-based composite material based on cellulose fiber internal curing and its preparation method
  • An ultra-high performance cement-based composite material based on cellulose fiber internal curing and its preparation method

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Experimental program
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Effect test

preparation example Construction

[0034] The preparation method of the above-mentioned ultra-high-performance cement-based composite material based on cellulose fiber internal maintenance comprises the following steps:

[0035] (1) Add water, fine aggregate and cellulose fiber into the mixer at a speed of 110-130 rpm, and stir for 20-35 minutes;

[0036] (2) Add cement, active mineral admixture, and high-efficiency admixture to the mixer in turn, at a speed of 55-65 rpm, and stir for 3-5 minutes until a slurry is formed;

[0037] (3) Slowly add fine steel fibers into the slurry, stir for 2 to 3 minutes at a rotation speed of 55 to 65 rpm, and then stir for 1 to 2 minutes at a rotation speed of 110 to 130 rpm;

[0038] (4) Pour the mortar into the forming mold, vibrate for 60-100 times, remove the mold after standing for 24 hours, and maintain it to obtain the ultra-high performance cement-based composite material.

Embodiment 1

[0041]

[0042]

[0043] Among them, the cement is P·I 52.5 Portland cement; mineral admixtures include F-class fly ash 13.1%, silica fume 4.3% and light calcium powder 4.3%; River sand, continuous gradation, fineness modulus 2.6; fine steel fiber diameter 0.2mm, length 13mm, ultimate tensile strength 2850MPa; cellulose fiber monofilament diameter 18μm, average length 2.1mm, ultimate tensile strength 800MPa; The water reducing agent is a polycarboxylate water reducing agent with a water reducing rate of 40%.

[0044] The performance of the ultra-high-performance cement-based composite material prepared by the above-mentioned components according to the aforementioned process after 28 days of standard curing is as follows:

[0045] Flexural strength 47.8MPa, compressive strength 125.5MPa, self-shrinkage strain 148.9×10 -6 .

Embodiment 2

[0047]

[0048] Among them, the cement is P·I 52.5 Portland cement; mineral admixtures include metakaolin 12.0%, rice husk ash 4.0%; fine aggregate is ordinary river sand with a maximum particle size of 2.50 mm, continuous gradation, Modulus 2.4; fine steel fiber diameter 0.25mm, length 12mm, ultimate tensile strength 2380MPa; cellulose fiber monofilament diameter 10μm, average length 1.8mm, ultimate tensile strength 900MPa; high-efficiency admixture is water reducing rate of 40% Polycarboxylate water reducer.

[0049] The performance of the ultra-high-performance cement-based composite material prepared by the above-mentioned components according to the aforementioned process after 28 days of standard curing is as follows:

[0050] Flexural strength 46.7MPa, compressive strength 128.4MPa, self-shrinkage strain 130×10 -6 .

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Abstract

The invention discloses a cellulose fiber internal curing-based ultra-high-performance cement-based composite material and a preparation method thereof. The cellulose fiber internal curing-based ultra-high-performance cement-based composite material comprises the following components in weight percentage: 20.3-40.5% of cement, 8.1-25.3% of active mineral admixture, 32.5-60.8% of fine aggregate, 3.3-9.8% of micro-fine steel fibers, 0.03-0.05% of cellulose fibers, 5.6-8.6% of water and 0.3-0.6% of efficient admixture. According to the technical scheme of the ultra-high-performance cement-based composite material and the preparation method thereof, the advantages of good slurry workability, high breaking strength, low early hydration speed of cement-based materials, small early shrinkage and deformation amount, high overall hydration degree and the like are realized compared with the prior art. Meanwhile, the later compressive strength of cement-based materials is less affected by cellulose fibers. Therefore, the mechanical property and the durability during the later period are improved.

Description

technical field [0001] The invention relates to an ultra-high-performance cement-based composite material based on internal maintenance of cellulose fibers and a preparation method thereof, belonging to the field of building materials or basic engineering construction. Background technique [0002] Ultra-high-performance cement-based composite materials have excellent mechanical properties and durability, and can be used in facilities engineering in harsh environments, military defense facilities, long-span bridge box girders and other fields. In order to achieve a denser matrix structure for ultra-high-performance cement-based composites, the demand for cement is greater, and the amount of free water must be controlled to reduce the pore structure and internal defects. A large amount of cementitious materials and a very low water-to-binder ratio result in a faster early hydration rate of ultra-high performance cement-based composite materials, accompanied by relatively obvi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/04C04B16/06
CPCC04B16/0675C04B28/04C04B2201/50C04B18/08C04B18/146C04B14/28C04B14/068C04B14/34C04B2103/302C04B14/106C04B18/101C04B18/142C04B14/14
Inventor 郭丽萍马瑞
Owner SOUTHEAST UNIV
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