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Ultrahigh-toughness fiber-reinforced polymer modified cementitious composite and preparation method

A fiber-reinforced, ultra-high toughness technology, applied in the field of building materials, can solve the problems of unpublished literature reports and high prices, and achieve the effects of high bending initial cracking stress, improved matrix deformation capacity, and increased strain

Inactive Publication Date: 2017-03-08
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, this material has entered the stage of industrialization from the research and development stage in foreign countries, but the products of a few foreign companies (such as Danish Densit) are in a monopoly position, not only the price is high, but also the core technology is kept secret, such as material formula, molding and maintenance process, etc. The key technology has not been reported in the public literature

Method used

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  • Ultrahigh-toughness fiber-reinforced polymer modified cementitious composite and preparation method
  • Ultrahigh-toughness fiber-reinforced polymer modified cementitious composite and preparation method
  • Ultrahigh-toughness fiber-reinforced polymer modified cementitious composite and preparation method

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Embodiment 5

[0051] Ultra-high toughness fiber reinforced polymer modified cement-based composite material, prepared from ordinary portland cement, medium sand, polymer emulsion, synthetic polymer fiber, water reducer, defoamer, thickener and water , using the following formula by weight: Ordinary Portland cement 100, polymer emulsion (in terms of solid content) 25, medium sand 50, water reducer 0.1, thickener 0.1, water (including water contained in the emulsion) 30. Wherein, the synthetic polymer fiber accounts for 2.5% of the total volume of the composite material, and the defoamer accounts for 0.05% of the polymer emulsion quality. In this embodiment, the polymer emulsion is a styrene-acrylic emulsion with a solid content of 47%, and the synthetic polymer fiber is Polyvinyl alcohol fiber, the length is 10mm, the diameter is 15μm, the tensile strength is 1200MPa, the elastic modulus is 30GPa, the water reducer is polycarboxylate water reducer, the defoamer is emulsion defoamer, the thic...

Embodiment 6

[0058] Ultra-high toughness fiber-reinforced polymer modified cement-based composite material, prepared from cement, medium sand, polymer emulsion, synthetic polymer fiber, water reducer, defoamer, thickener and water, using the following weight Part formula composition: Ordinary Portland cement 100, polymer emulsion (calculated as solid content) 35, medium sand 50, water reducer 0.5, thickener 0.5, water 40, synthetic polymer fiber accounts for 2.5 of the total volume of the composite material %, the defoamer accounts for 0.05-0.2% of the mass of the polymer emulsion. The polymer emulsion is an emulsion for modifying cement mortar. In this embodiment, S400 styrene-acrylic emulsion with a solid content of 57% is used. The synthetic polymer fibers are polyvinyl alcohol fibers with a length of 15 mm, a diameter of 25 μm, a tensile strength of 1500 MPa, and an elastic modulus of 50 GPa. The water reducer is a polycarboxylate water reducer. The defoamer is an emulsion type defoa...

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Abstract

The invention relates to an ultrahigh-toughness fiber-reinforced polymer modified cementitious composite and a preparation method. The ultrahigh-toughness fiber-reinforced polymer modified cementitious composite is prepared from raw materials in parts by weight as follows: 100 parts of comprising cement, 50 parts of medium sand, 25-35 parts of polymer emulsion (in terms of solid content), synthetic polymer fibers, 0.1-0.5 parts of a water reducing agent, an antifoaming agent, 0.1-0.5 parts of a thickener and 30-40 parts of water according to a formula, wherein the synthetic polymer fibers account for 2.5% of the total volume of the composite, and the antifoaming agent accounts for 0.05%-0.2% of the mass of the polymer emulsion. Compared with the prior art, the ultrahigh-toughness fiber-reinforced polymer modified cementitious composite has the advantages of ultrahigh initial cracking strain, higher bending stress, higher initial cracking stress and the like.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to an ultrahigh-toughness fiber-reinforced polymer modified cement-based composite material and a preparation method thereof. Background technique [0002] In 1992, Victor C.Li, a professor at the University of Michigan at ACE-MRL, used the principles of fracture mechanics and micromechanics to systematically design, adjust and optimize cement-based composite materials for the first time. Through the study of steady-state cracking and multi-slit cracking, The feasibility of preparing the cement-based composite material ECC——Engineered Cementitous Composite with ultra-high toughness is theoretically discussed. The original ECC was just a general reference, but today, due to its outstanding performance in toughness, it has been called "UltraHigh Toughness Cementitious Composites" (UHTCC) by some scholars. , and defined as: use short fiber reinforcement, and the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04C04B16/06
CPCC04B16/06C04B16/0641C04B28/04C04B2201/50C04B14/06C04B24/2676C04B2103/50C04B2103/302C04B24/383
Inventor 陈维灯韩冬冬钟世云
Owner TONGJI UNIV
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