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Ultrahigh-toughness cement-based composite material used in ejection, and ejection process thereof

A technology of ultra-high toughness, composite materials, applied in the fields of manufacturing tools, climate sustainability, sustainable waste disposal, etc. Good rheological properties, easy to use results

Active Publication Date: 2014-11-19
浙江固邦新材料有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The technical problems that cannot be solved by the existing technology can be divided into the following aspects: 1) How to prepare the ultra-high toughness cement-based composite material that meets the requirements of the spraying process, so that it has good rheological properties in the state of the mixture, and Maintain the original micro-mechanical properties after spray hardening; 2) How to obtain and control the key parameters of the spraying process, so that the fibers are dispersed well, the rebound rate is low, and the spraying continuity is good during the spraying process; 3) How to solve the existing ultra-high The problem of long mixing time (more than 15~20min) of the tough cement-based composite material mixture can realize continuous and rapid construction; 4) How to realize a spraying process that does not need to modify the spraying machine to spray another accelerator; 5) How to use it Quantitative enhancement of crack control by spraying process and maximum efficiency utilization of materials

Method used

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  • Ultrahigh-toughness cement-based composite material used in ejection, and ejection process thereof
  • Ultrahigh-toughness cement-based composite material used in ejection, and ejection process thereof
  • Ultrahigh-toughness cement-based composite material used in ejection, and ejection process thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] In this example, a reinforced concrete slab is sprayed with ultra-high toughness cement-based composite material as an existing reinforced concrete structure to achieve enhanced crack control (such as figure 2 shown), where 1 is the ultra-high toughness cement-based composite material layer to be sprayed, 2 is the distributed reinforcement of the existing reinforced concrete structure, 3 is the stressed reinforcement of the existing reinforced concrete structure, and 4 is the existing reinforced concrete structure concrete. The length a=2340mm of the existing reinforced concrete structure, the width of the existing reinforced concrete structure b =1120mm, the height of the existing reinforced concrete structure h =80mm, the distance from the core of the steel bar in the tension zone of the existing reinforced concrete structure to the edge of the tension zone of the existing reinforced concrete structure m =20mm, the concrete compressive strength of the existing rein...

Embodiment 2

[0058] On the basis of Example 1, the enhancement target is to adjust the percentage of the bearing capacity that needs to be improved on the basis of the existing bearing capacity of the structure to α =25%, other conditions are the same.

[0059] The spray thickness of the ultra-high toughness cement-based composite material ( t ) is the minimum thickness required to meet the stated structural reinforcement needs t 1 =10mm, the minimum thickness required to meet the crack control requirements t 2 =9mm. Considering that the structure needs to meet the requirements of reinforcement and crack control at the same time, t need to be satisfied at the same time t 1 and t 2 , so take t = t 1 =10mm.

[0060] Other implementation steps are the same.

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Abstract

The invention discloses an ultrahigh-toughness cement-based composite material (UHTCC) which can be used in ejection, and an ejection process thereof. The invention relates to the technical field of ultrahigh-toughness cement-based composite material ejection. The main technical scheme of the invention is that the ultrahigh-toughness cement-based composite material used for ejection is designed based on rheological and micro-mechanical principals; the ejection process of the material is realized through determination and control over key parameters; and quantitative enhancement and crack control of a concrete structure requiring ejection reinforcement are realized. According to the invention, problems of ultrahigh-toughness cement-based composite material ejection, quantitative enhancement and crack control are solved. The technical scheme has the characteristics of simple application, fast and continuous construction, high applicability, realization of material maximal utilization rate, and the like. The material and the process can be widely applied in construction and existing structure reparation and reinforcement in the fields of hydraulic engineering, harbor engineering, traffic engineering, bridge and tunnel engineering, and underground engineering.

Description

technical field [0001] The patent of the invention belongs to the technical field of ultra-high toughness cement-based composite material spraying. Background technique [0002] Ultra-high toughness cement-based composite (UHTCC) is a kind of reinforced with short fibers, and the fiber content does not exceed 2.5% of the total volume of the composite. Cracking characteristics, the ultimate tensile strain can reach more than 3% cement-based materials. The strain hardening characteristics and the harmless dispersing ability of cracks possessed by this kind of material fundamentally change the brittle and easy cracking characteristics of ordinary concrete materials, and realize the strain hardening characteristics and ultra-high deformation and crack control ability that ordinary fiber concrete does not have. , can be widely used in water conservancy projects, harbor and sea projects, traffic projects, bridge and tunnel projects, construction of underground projects and repair...

Claims

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Application Information

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IPC IPC(8): C04B28/06C04B28/04B28B1/32C04B18/08C04B14/04C04B14/10
CPCY02W30/91
Inventor 徐世烺李庆华王激扬周斌黄博滔
Owner 浙江固邦新材料有限公司
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