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Ultra-high performance concrete composition capable of being sprayed for construction

A concrete composition and ultra-high-performance technology, applied in the field of concrete, can solve problems such as low construction efficiency and difficulty in supporting formwork for non-planar ultra-high-performance concrete, and achieve the effects of improving production efficiency, enriching product types, and good fluidity

Pending Publication Date: 2022-02-22
JIANGSU SOBUTE NEW MATERIALS +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problems of non-planar ultra-high-performance concrete formwork difficulty and low construction efficiency, the present invention mainly provides a sprayable ultra-high-performance concrete composition to meet the needs of efficient preparation of special-shaped structures

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] An ultra-high-performance concrete composition that can be sprayed and constructed. It is composed of composite cementitious material, thixotropic agent, graded fine sand, special fiber, and water reducing agent. The mass ratio is 600:1.5:400:60:20; composite The cementitious material is made of Onoda ordinary silicate 52.5, gray silica fume, and ultrafine mineral powder in a mass ratio of 8:1:1; the thixotropic agent is montmorillonite; the graded fine sand is 20-40 mesh, 40-70 mesh, 70-120 mesh quartz sand, the mass percentage of the three kinds of sand is 10%:30%:60%; the special fiber is polyoxymethylene fiber with a length of 12 mm and a diameter of 0.2 mm; the water reducer is Jiangsu Subo The water reducing rate produced by Texin Materials Co., Ltd. is 45% polycarboxylate water reducing agent.

Embodiment 2

[0038] An ultra-high-performance concrete composition that can be sprayed and constructed. It is composed of composite cementitious material, thixotropic agent, graded fine sand, special fiber, and water reducing agent. The mass ratio is 500:5.0:500:10:18; composite The cementitious material is made of Onoda silicate 52.5, white silica fume, and microbeads in a mass ratio of 7.5:2.0:0.5; the thixotropic agent is attapulgite; the graded fine sand is 20-40 mesh, 40-70 mesh Mesh, 70-120 mesh quartz sand, the mass percentages of the three kinds of sand are 0%:25%:75%; the special fiber is the mixed use of polyoxymethylene and polyvinyl alcohol fibers with a length of 12 mm and a diameter of 0.2 mm, and the mass ratio is 7:3; the water reducing agent is a polycarboxylate water reducing agent with a water reducing rate of 42% produced by Jiangsu Subote New Material Co., Ltd.

Embodiment 3

[0040] An ultra-high-performance concrete composition that can be sprayed and constructed. It is composed of composite cementitious material, thixotropic agent, graded fine sand, special fiber, and water reducing agent. The mass ratio is 560:25:440:10:18; composite The cementitious material is Onoda silicate 52.5, ultrafine calcium carbonate, ultrafine mineral powder, and white silica fume in a mass ratio of 7:1.0:1.0:1.0; the thixotropic agent is attapulgite; graded fine sand It is 20-40 mesh, 40-70 mesh, 70-120 mesh quartz sand, the mass percentage of the three kinds of sand is 15%: 15%: 70%; the special fiber is polyoxymethylene fiber with a length of 6 mm and a diameter of 0.2 mm. 18 mm, 0.35 mm in diameter polyvinyl alcohol fiber and 20000 decitex high zirconium alkali-resistant glass fiber are mixed, the mass ratio is 4:4:2; The water rate is 40% polycarboxylate superplasticizer.

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Abstract

The invention discloses an ultra-high performance concrete composition capable of being sprayed for construction. The concrete composition disclosed by the invention consists of a composite cementing material, a thixotropic agent, graded fine sand, special fibers and a water reducing agent; the composite cementing material comprises cement and an admixture, the thixotropic agent is a clay mineral with a chain layer structure, the graded fine sand is selected from any one of river sand, quartz sand and machine-made sand, and the special fibers are one or a mixture of two of chopped fibers or continuous high-zirconium alkali-resistant glass fibers in any proportion; and the water reducing agent is a polycarboxylic acid high-efficiency water reducing agent, and the water reducing rate of the water reducing agent is not lower than 40%. Under the condition of ultra-low water-binder ratio, the concrete composition has good fluidity and thixotropy after spraying, does not sag, can be suitable for construction of various spraying devices, can be suitable for construction of vertical surfaces, top surfaces, curved surfaces and other positions of multi-material molds, can be used for preparing ultra-high performance concrete members or decorative products with complex shapes, and has wide application prospects.

Description

technical field [0001] The invention relates to the field of concrete, in particular to an ultra-high performance concrete composition capable of spraying construction. Background technique [0002] Ultra-high performance concrete is suitable for making exterior wall decorative panels because of its excellent mechanical properties and durability, especially the characteristics of bending resistance, low water absorption, high surface compactness, and stain resistance. Conventional pouring methods can only be used to prepare flat decorative panels. Under the background of increasingly complex, refined and large-scale modeling of building exterior decorative panels, it is necessary to prepare slopes, elevations, hyperbolic or multi-curved surfaces, and three-dimensional decorations. It is difficult to realize the direct pouring method, therefore, there is an urgent need to develop a spray-formable UHPC material system. [0003] Patent CN201910627894.X discloses a spray-on ult...

Claims

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Application Information

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IPC IPC(8): C04B28/04
CPCC04B28/04C04B2201/50C04B2201/52C04B18/146C04B18/141C04B14/104C04B14/06C04B16/0616C04B2103/302C04B14/24C04B14/102C04B16/0641C04B14/42C04B14/28Y02W30/91
Inventor 阳知乾沙建芳刘建忠刘加平韩方玉林玮郭飞徐海源黄文聪吕进
Owner JIANGSU SOBUTE NEW MATERIALS
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