Self-stress and self-compacting fiber concrete and preparation method thereof

A self-compacting concrete and self-stressing technology, which is applied in the field of building structural materials, can solve problems such as unfavorable seismic performance of steel pipe concrete structures, difficulty in ensuring fiber dispersion, wasting structural use space, etc., to solve vibration difficulties, improve combination effects, The effect of increasing the tensile strength

Inactive Publication Date: 2015-10-14
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] 1. Common-strength concrete is cheap and widely used. However, with the increase of building structure height and load, if ordinary-strength concrete is used, the component size will be larger, which will waste the structural space and lower economic benefits;
[0009] 2. High-strength concrete has a high bearing capacity, which saves the space used by the building structure, but with the increase of strength, the brittlenes

Method used

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  • Self-stress and self-compacting fiber concrete and preparation method thereof
  • Self-stress and self-compacting fiber concrete and preparation method thereof
  • Self-stress and self-compacting fiber concrete and preparation method thereof

Examples

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Comparison scheme
Effect test

Embodiment 1

[0039] The invention provides a fiber self-stressing self-compacting concrete and a preparation method thereof. The method includes the following steps:

[0040] Step 1. Select medium sand as the fine aggregate, and select the gravel with a diameter of 5-15mm and continuous gradation as the coarse aggregate;

[0041] Step 2. Mix 2.67kg of polycarboxylic acid-based high-performance water reducing agent into 247.5kg of water (mass ratio 1.08%: 1) and stir evenly for later use;

[0042] Step 3: Put 634.1kg of medium sand and 730.5kg of stones (mass ratio 1:1.15) into the mixing tank and mix for 30s;

[0043] Step 4. Add 47.1kg of high-quality bonded steel fibers (0.6% by volume to concrete: 1) into the well-stirred medium sand and gravel mixture and stir for 60s to make it evenly dispersed;

[0044] Step 5. Put 750kg of sulphoaluminate self-stressing cement into the mixing tank and mix for 60s to make the different materials evenly mixed;

[0045] Step 6, adding the water mixed with the adm...

Embodiment 2

[0047] The invention provides a fiber self-stressing self-compacting concrete and a preparation method thereof. The method includes the following steps:

[0048] Step 1. Select medium sand as the fine aggregate, and select the gravel with a diameter of 5-15mm and continuous gradation as the coarse aggregate;

[0049] Step 2: Add 3.66kg of polycarboxylic acid-based high-performance water reducing agent to 247.5kg of water (mass ratio 1.5%: 1) and stir evenly for later use;

[0050] Step 3. Put 634.1kg of medium sand and 729kg of gravel photos (mass ratio 1: 1.15) into the mixing tank and mix for 45s, and mix well;

[0051] Step 4. Add 94.2kg of high-quality bonded steel fibers (1.2% by volume to concrete: 1) into the well-stirred medium sand and gravel mixture and stir for 90s to make it evenly dispersed;

[0052] Step 5. Put 750kg of sulphoaluminate self-stressing cement into the mixing tank and mix for 90s to make the different materials evenly mixed;

[0053] Step 6, adding water (wate...

Embodiment 3

[0055] The invention provides a fiber self-stressing self-compacting concrete and a preparation method thereof. The method includes the following steps:

[0056] Step 1. Select medium sand as the fine aggregate, and select the gravel with a diameter of 5-15mm and continuous gradation as the coarse aggregate;

[0057] Step 2: Add 6.24kg of polycarboxylic acid-based high-performance water reducing agent to 172.5kg of water (mass ratio 3.6%: 1) and stir evenly for later use;

[0058] Step 3: Put 806kg of medium sand and 814kg of stones (mass ratio 1:1) into the mixing tank and mix for 40s, and mix evenly;

[0059] Step 4. Add 47.1kg of high-quality bonded steel fibers (with a volume ratio of 0.6% to concrete: 1) into the well-stirred medium sand and gravel mixture and stir for 70s to make it evenly dispersed;

[0060] Step 5. Put 750kg of sulphoaluminate self-stressing cement into the mixing tank and mix for 60s to make the different materials evenly mixed;

[0061] Step 6, adding water (wa...

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Abstract

The invention discloses a self-stress and self-compacting fiber concrete and a preparation method thereof. The preparation method comprises the following steps: (1) adding awater reducer or the water reducer and the thickening agent into water at the same time and stirring evenly; (2) feeding coarse aggregate and fine aggregate according to a ratio into a stirring barrel and evenly stirring; (3) adding fibers according to a certain ratio into an evenly mixed coarse aggregate-fine aggregate mixture and stirring so that the fibers can be evenly dispersed; (4) feeding cement or cement and a mineral additive into the stirring barrel according to a certain ratio and evenly stirring; and (5) feeding water doped with an additive obtained in the step (1) into the mixture obtained in the step (4), stirring evenly and discharging, thus obtaining the self-stress and self-compacting fiber concrete. According to the self-stress and self-compacting fiber concrete and the preparation method thereof, expansion of microcracks and generation of macro-cracks inside core concrete can be effectively inhibited, tensile strength, flexure strength, toughness, shock resistance and fatigue resistance of the core concrete can be improved, brittleness of the core concrete can be obviously reduced, and ductility of components can be enhanced.

Description

Technical field [0001] The invention relates to the technical field of building structural materials, in particular to a concrete filling material for steel tube concrete structures and a preparation method thereof. Background technique [0002] The concrete-filled steel tube structure is a composite structure with superior performance. Its good performance comes from the interaction between steel tube and concrete during the stress process, that is, restraint and support. Therefore, there are the following requirements for core concrete: [0003] (1) Concrete is easy to pouring, easy to ensure pouring quality and good interface performance; [0004] (2) The core concrete has small shrinkage, ensuring that steel pipes and concrete have good restraint and support effects in the short and long term; [0005] (3) It has high strength and good deformation ability, and meets the requirements of modern structure heavy load, large use space and good seismic performance. [0006] The existing...

Claims

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Application Information

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IPC IPC(8): C04B28/00
Inventor 卢亦焱李娜李杉李伟捷祝涛胡玲
Owner WUHAN UNIV
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