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Hybrid fiber toughened ultrahigh-strength and ultrahigh-ductility cement-based material

A technology of cement-based materials and hybrid fibers, applied in the field of materials science, can solve problems such as only focusing on strength, and achieve good fluidity

Pending Publication Date: 2018-09-28
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above-mentioned high (ultra-high) toughness concrete invention patents only focus on the strength (compressive strength, flexural strength) index, but in fact there are no relevant parameters that directly reflect its toughness index, and it still belongs to the traditional field of concrete

Method used

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  • Hybrid fiber toughened ultrahigh-strength and ultrahigh-ductility cement-based material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] 525 ordinary Portland cement: 1250 parts, silica fume: 291 parts, mineral powder: 200 parts, quartz sand: 407.8 parts, water: 201 parts, steel fiber: 7.5 parts, ultra-high molecular weight polyethylene fiber: 12.5 parts.

[0027] First add the solid mixture into the stirring pot, and dry stir for 3 minutes at a slow speed (revolution 62±5r / min, rotation 140±5r / min) until uniform. Then add the water reducer and aqueous solution into the stirring pot, stir quickly (revolution 125±10r / min, rotation 285±10r / min) for 5 minutes, add the fiber in the stated proportion, and stir for another 6 minutes until the ultra-high molecular weight polyethylene fiber Disperse evenly to obtain a super-high-strength and super-high-ductility cement-based material toughened by hybrid fibers. Finally, the slurry is put into a mold for molding and cured at room temperature for 28 days.

[0028] figure 1 Schematic diagram of the relationship between stress-strain and age of the ultra-high-stren...

Embodiment 2

[0030] 525 ordinary Portland cement: 700 parts, silica fume: 230 parts, mineral powder: 750 parts, quartz sand: 500 parts, water: 230 parts, steel fiber: 5 parts, ultra-high molecular weight polyethylene fiber: 15 parts.

[0031] First add the solid mixture into the stirring pot, and dry stir for 3 minutes at a slow speed (revolution 62±5r / min, rotation 140±5r / min) until uniform. Then add the water reducer and aqueous solution into the stirring pot, stir quickly (revolution 125±10r / min, rotation 285±10r / min) for 5 minutes, add the fiber in the stated proportion, and stir for another 6 minutes until the ultra-high molecular weight polyethylene fiber Disperse evenly to obtain a super-high-strength and super-high-ductility cement-based material toughened by hybrid fibers. Finally, the slurry is put into a mold for molding and cured at room temperature for 28 days.

[0032] The properties of the material at 3 days are as follows: the tensile strength is 8.6 MPa, and the ultimate s...

Embodiment 3

[0034] A hybrid fiber-reinforced ultra-high-strength and ultra-high ductility cement-based material, including the following components and raw materials in parts by weight: 525 ordinary Portland cement: 700, silica fume: 200, mineral powder: 200, quartz sand: 400 , water: 200, polycarboxylate superplasticizer: 20, ultra-high molecular weight polyethylene fiber: 5, ultra-high-strength steel fiber: 39.

[0035] Among them, the ultra-high molecular weight polyethylene fiber used has a length of 6mm, a diameter of 15μm, a tensile strength of 1800MPa, an elastic modulus of 40GPa, an ultimate elongation of 2%, and an aspect ratio greater than 400. The ultra-high-strength steel fiber is a straight fiber with a length of 6mm and a diameter of 0.115mm. The tensile strength is 2700MPa, the elastic modulus is 200GPa, and the ultimate elongation is 2%. The mesh number of quartz sand is 70 mesh, and the ratio of mortar to sand is not more than 0.5, so as to control the fracture toughness ...

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Abstract

The invention relates to a hybrid fiber toughened ultrahigh-strength and ultrahigh-ductility cement-based material which comprises the following ingredients in parts by weight: 700-1250 parts of 525 ordinary Portland cement, 200-300 parts of silica fume, 200-750 parts of mineral powder, 400-500 parts of quartz sand, 200-230 parts of water, 20-30 parts of a polycarboxylic acid high efficiency waterreducer, 5-20 parts of ultra-high molecular weight polyethylene fiber and 39-117 parts of ultrahigh-strength steel fiber. Compared with the prior art, the cement-based composite with maximum compressive strength of 200MPa, direct tension strength near 15MPa, tensile ductility near 10% and slump of greater than 180mm is obtained by mixed use of the ultra-high molecular weight polyethylene fiber and the steel fiber, and can be pumped and cast in place.

Description

technical field [0001] The invention belongs to the field of materials science, and relates to a composite material for construction, in particular to a super-high-strength and super-high-ductility cement-based material reinforced by hybrid fibers. Background technique [0002] As the most widely used building material in the world today, concrete has the disadvantages of low flexural strength and high brittleness, which leads to cracks or even fractures in concrete, which seriously affects the overall safety and service life of buildings or structures. There are a large number of building structures and parts in modern buildings, such as high-speed railway viaducts, bridge decks, expansion joints, and key nodes of super high-rise buildings. Due to the complex and harsh stress environment, bending resistance, High-strength and high-ductility concrete material with the highest possible tensile strength and ductility. [0003] Ultra-high performance concrete UHPC has a compre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04
CPCC04B28/04C04B2201/50C04B2201/52C04B18/146C04B18/12C04B14/48C04B14/06C04B16/0625C04B2103/302
Inventor 俞可权余江滔谢星星李凌志
Owner TONGJI UNIV
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