Preparation of recycled concrete through compound enhancement of low-elasticity-modulus modified coarse fibre and active mineral material

A technology of recycled concrete and concrete, applied in the field of green building materials, can solve the problems of the discreteness of concrete restricting the development of recycled concrete, and achieve the effect of improving the interface transition zone

Inactive Publication Date: 2013-05-15
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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Problems solved by technology

However, in the preparation of recycled concrete, the coarse aggregate used is artificially crushed and processed aggregate from waste concrete from different sources. Compared with natural aggregate, due to the initial defects of recycled aggregate and the new Many factors, such as the weak contact interface between mortar and recycled aggregate and the discreteness of concrete itself, limit the development of recycled concrete preparation technology.

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  • Preparation of recycled concrete through compound enhancement of low-elasticity-modulus modified coarse fibre and active mineral material
  • Preparation of recycled concrete through compound enhancement of low-elasticity-modulus modified coarse fibre and active mineral material
  • Preparation of recycled concrete through compound enhancement of low-elasticity-modulus modified coarse fibre and active mineral material

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Embodiment

[0029] 1. Carry out mechanical crushing, screening, cleaning, etc. on waste concrete, and the particle gradation of the prepared coarse aggregate should meet the table in Article 3.2.1 of "Standards for the Quality and Testing Methods of Sand and Stone for Ordinary Concrete" (JGJ52-2006). 3.2.1-2 (grain grading range of crushed stone or pebble) Requirements for aggregate. Depend on figure 2 It can be seen that natural coarse aggregate NA-I, recycled coarse aggregate RA-I, RA-II, and RA-III all meet the requirements of JGJ52-2006 for continuous gradation of coarse aggregate.

[0030] Cumulative curve of particle size distribution figure 2 Determine the relevant particle size d of the particles 10 、d 30 and d 60 , and obtain the unevenness coefficient Ku=d 60 / d 10 and coefficient of curvature where d 10 is the corresponding particle size when the mass percentage of particles smaller than a certain particle size is 10%; d 30 is the corresponding particle size when th...

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Abstract

The invention relates to a method for preparing recycled concrete through compound enhancement of low-elasticity-modulus modified coarse fibre and active mineral material. Cracked waste concrete is adopted as partially recycled coarse aggregate the concrete; modified polypropylene TANK fiber, coal ash, silicon powder and a high-efficient water reducing agent are added to improve the mechanical property of the recycled concrete; in terms of 100 parts by weight, the concrete comprises 14 parts of 32.5R common portland cement, 20 parts of fine aggregate (medium-coarse sand), 36 parts of natural macadam (5-31.5mm), 15 parts of recycled aggregate (5-20mm), 4-5 parts of second-level coal ash, 1-2 parts of silicon powder, 0.3 part of high-efficient water reducing agent, 9 parts of water and 0.01-0.04 part of modified polypropylene TANK fiber per cubic meter. The method is simple in preparation and reliable in performance, provides a new method for effectively utilizing and promoting the recycled concrete, increases utilization rate of the waste concrete and has economy and social value.

Description

technical field [0001] The invention belongs to the field of new environment-friendly green building materials, and relates to recycled concrete prepared from waste concrete, in particular to a preparation method of composite reinforced recycled concrete with low elastic modulus modified polypropylene coarse TANK fiber active cementitious material. Background technique [0002] The massive consumption and irrational use of natural resources have resulted in an increasing shortage of natural resources. Waste concrete is used as waste from building construction and demolition of old buildings. If it is discarded, it will not only bring about complex environmental problems, but also cause A huge waste of resources. Therefore, in order to meet the requirements of the circular economy strategy and realize the sustainable development of the concrete industry, the research and application of recycled concrete is imperative. However, in the preparation of recycled concrete, the coa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/04C04B18/30C04B18/16C04B18/08C04B16/06
CPCY02W30/91
Inventor 王社良张博何金胜丁怡洁李彬彬李涛
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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