Lightweight high-strength high-ductility mortar and preparation method thereof

A high-ductility, high-strength technology, applied in the field of building materials, can solve problems such as insufficient charge-to-mass ratio, low elastic modulus, and high density, and achieve the effects of simple preparation method, improved durability, and reduced density

Inactive Publication Date: 2019-10-22
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of the deficiencies in the prior art, in order to solve the technical problems of high density, low ductility, insufficient charge-to-mass ratio of UHPC materials, and the existing high-toughness crack-controlling and anti-fiber concrete strength and l

Method used

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  • Lightweight high-strength high-ductility mortar and preparation method thereof
  • Lightweight high-strength high-ductility mortar and preparation method thereof
  • Lightweight high-strength high-ductility mortar and preparation method thereof

Examples

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preparation example Construction

[0083]

[0084] The preparation method of lightweight high-strength high-ductility mortar of the present invention comprises the following steps:

[0085] (1), 300-600 parts of cement, 100-250 parts of silica fume, 0-450 parts of slag powder, 0-250 parts of recycled powder, 0-300 parts of fly ash floating beads, 0-200 parts of glass microspheres and Add 0-300 parts of regenerated rubber powder into the mixer and mix well, then dry the powder and stir to obtain the first mixture;

[0086] (2) Add the mixed liquid of 20-50 parts of water reducer and 150-300 parts of water into the first mixture and stir to make the dry powder into a slurry to obtain the second mixture;

[0087] (3), adding 5-15 parts of ultra-high molecular weight polyethylene fibers and 0-10 parts of polyester fibers into the second mixture in batches and stirring to obtain a third mixture;

[0088] (4) Finally, transfer the third mixture into the mold, vibrate and form it, and perform standard curing after ...

Embodiment 1

[0099] Contain three products in the present embodiment, and its serial number is recorded as 1-1, 1-2, 1-3 respectively.

[0100] The light, high-strength and high-ductility mortar of this embodiment includes P.O.52.5 (28-day compressive strength of cement>52.5MPa) ordinary Portland cement, silica fume, slag powder, recycled powder, fly ash floating beads, water reducing agent, Tap water and UHMWPE fibers. Each component is shown in Table 1 below, and each part in the table is the content in parts by weight. The length of the ultra-high molecular weight polyethylene fiber in Table 1 is 12 mm, and the aspect ratio is 600.

[0101] Table 1 product components and parts by weight content

[0102]

[0103] The preparation method of the lightweight high-strength high-ductility mortar of the present embodiment comprises the following steps:

[0104] (1) Add cement, silica fume, slag powder, regenerated powder, and fly ash floating beads into the mixer and mix well, and stir the...

Embodiment 2

[0112] Contain three products in this embodiment, and its serial number is marked as 2-1, 2-2, 2-3 respectively.

[0113] The light, high-strength and high-ductility mortar of this embodiment includes P.O.52.5 (28-day compressive strength of cement > 52.5MPa) ordinary Portland cement, silica fume, slag powder, recycled powder, glass microspheres, water reducing agent, tap water and Ultra-high molecular weight polyethylene fibers. Each component is shown in Table 3 below, and each part in the table is the content in parts by weight. The length of the ultra-high molecular weight polyethylene fiber in Table 3 is 12 mm, and the aspect ratio is 600.

[0114] Table 3 product components and parts by weight

[0115]

[0116] The preparation method of the lightweight high-strength high-ductility mortar of the present embodiment comprises the following steps:

[0117] (1) Add cement, silica fume, slag powder, regenerated powder, and glass microspheres into the mixer and mix well, a...

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Abstract

The invention provides a lightweight high-strength high-ductility mortar and a preparation method thereof. The mortar comprises cement, silica fume, slag powder, recycled powder, fly ash floating beads, glass microbeads, recycled rubber powder, a water reducing agent, water, ultrahigh-molecular-weight polyethylene fibers and polyester fibers. The preparation method comprises the following steps of: mixing the cement, the silica fume, the slag powder, the recycled powder, the fly ash floating beads, the glass microbeads and the recycled rubber powder under stirring to obtain a first mixture; adding the mixed liquid of the water reducing agent and the water into the first mixture and carrying out stirring to obtain a second mixture; adding the ultrahigh-molecular-weight polyethylene fibers and the polyester fibers into the second mixture and carrying out stirring to obtain a third mixture; and finally, subjecting the third mixture to vibration molding and maintenance. The mortar of the invention has the characteristics of light weight, high compressive strength, high tensile strength, excellent energy-dissipating capacity, high stretching charge mass ratio and ultra-high tensile ductility, thereby significantly reducing the deadweight of materials and structures and maintaining sufficient bearing capacity.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a light-weight, high-strength, high-ductility mortar and a preparation method thereof. Background technique [0002] Ultra high performance concrete (UHPC for short) has a compressive strength of 200MPa, a flexural strength of 20-40MPa, and a straight tensile strength of not less than 8MPa. In the published patents (CN104030634A, CN101874004A), ultra-high performance concrete materials have significant strength properties, including compressive strength, flexural strength and unidirectional tensile strength, but their unidirectional tensile strain is only 0.5% , and the multi-crack distribution cannot be formed, and the strain value has a significant size effect. The unidirectional tensile strain is only slightly higher than the yield strain of the steel bar, which leads to the risk of crack localization and expansion in UHPC members, thus limiting the use...

Claims

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Application Information

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IPC IPC(8): C04B28/04C04B111/40
CPCC04B28/04C04B2111/40C04B2201/20C04B2201/50C04B2201/52C04B18/146C04B18/141C04B18/082C04B14/24C04B18/22C04B2103/302C04B16/0633C04B16/0683
Inventor 俞可权李凌志谭迪余江滔
Owner TONGJI UNIV
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