Ultrahigh-performance concrete, ultrahigh-performance concrete cored slab and preparation method thereof

An ultra-high-performance concrete technology, applied in floors, building components, buildings, etc., can solve problems such as free flow, poor fluidity, and easy air-dried crust on the surface

Pending Publication Date: 2019-04-09
BEIJING MUNICIPAL ENG RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the high viscosity and poor fluidity of the existing ultra-high performance concrete, it is difficult to flow freely in the pouring gap between the molds, which may easily cause defects and cavities during the pouring process; secondly, the surface of the exi

Method used

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  • Ultrahigh-performance concrete, ultrahigh-performance concrete cored slab and preparation method thereof
  • Ultrahigh-performance concrete, ultrahigh-performance concrete cored slab and preparation method thereof
  • Ultrahigh-performance concrete, ultrahigh-performance concrete cored slab and preparation method thereof

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preparation example Construction

[0048] The present invention also provides a preparation method for the ultra-high performance concrete hollow slab described in the above technical solution, comprising the following steps:

[0049] Assembling the outer formwork to obtain the outer formwork cavity;

[0050] Fix the foam board in the outer formwork cavity, and form a pouring gap between the outer formwork and the foam board;

[0051] After pouring the ultra-high-performance concrete into the gap between the outer formwork and the foam board, spray a steam reducing agent on the pouring surface, and perform surface closing treatment to obtain a hollow blank;

[0052] After the hollow preform is steam-cured, the outer mold is removed to obtain an ultra-high performance concrete hollow slab.

[0053] The invention assembles the outer formwork to obtain the outer formwork cavity.

[0054] In the present invention, the outer formwork is preferably a steel formwork. The present invention has no special requirement...

Embodiment 1

[0066] Ultra-high performance concrete contains the following components by weight: Portland 42.5R cement is 25 parts; silica fume is 5 parts; fly ash microbeads is 5 parts; medium sand is 22 parts; fine sand is 25 parts; 5 parts for steel fiber; 6 parts for water; 0.7 parts for water reducing agent; 0.8 parts for anti-crack toughening agent; 0.25 parts for defoaming agent; 40%.

Embodiment 2

[0068] Ultra-high performance concrete contains the following components and weight ratios: Portland 42.5R cement is 22 parts; silica fume is 6 parts; fly ash microbeads is 7 parts; medium sand is 22 parts; fine sand is 25 parts; 5 parts for steel fiber; 6 parts for water; 0.7 parts for water reducing agent; 0.8 parts for anti-crack toughening agent; 0.25 parts for defoaming agent; 40%.

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Abstract

The invention provides ultrahigh-performance concrete, an ultrahigh-performance concrete cored slab and a preparation method thereof and belongs to the technical field of concrete members. The ultrahigh-performance concrete comprises the following components in parts by weight: 20-30 parts of Portland cement, 3-8 parts of silica fume, 3-8 parts of coal ash microspheres, 20-30 parts of medium sand,20-30 parts of fine sand, 4-7 parts of steel fibers, 5-7 parts of water, 0.5-1 part of water reducing agent, 0.5-1 part of anti-cracking and toughening agent and 0.5-1 part of defoaming agent; and the water reducing rate of the water reducing agent is 35% or above. Due to the adoption of the components and ratios, the gap of the ultrahigh-performance concrete can be minimized, furthermore, waterin the gap can be favorably extruded, the flowability of the concrete is improved, and the ultrahigh-performance concrete can be used for pouring a cored slab.

Description

technical field [0001] The invention belongs to the technical field of concrete components, and in particular relates to an ultra-high-performance concrete, an ultra-high-performance concrete hollow slab and a preparation method thereof. Background technique [0002] A building assembled on site by prefabricated components is called a prefabricated building. In recent years, with the country's strong support for prefabricated buildings, its proportion in construction has increased significantly. A large number of building parts of prefabricated buildings are produced and processed by the workshop. The main types of components are: exterior wall panels, interior wall panels, laminated panels, balcony / balcony partitions, air-conditioning panels, stairs, prefabricated beams, prefabricated columns, etc. Among them, the balcony partition mainly plays the role of decoration and partition, but because it is located on the lower balcony without support, the weight requirements are ...

Claims

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Application Information

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IPC IPC(8): C04B28/04E04B5/04
CPCE04B5/043C04B28/04C04B40/04C04B18/146C04B18/082C04B14/06C04B14/48C04B22/002C04B2103/302C04B2103/50C04B24/42
Inventor 夏春蕾李宇容李世元任成传王贯明张磊赵志刚
Owner BEIJING MUNICIPAL ENG RES INST
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