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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Concrete aggregates properties crushed by jaw and impact secondary crushing

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Author(s):
Ulsen, Carina [1] ; Tseng, Ester [2] ; Angulo, Sergio Cirelli [3] ; Landmann, Mirko [4] ; Contessotto, Renato [1] ; Balbo, Jose Tadeu [2] ; Kahn, Henrique [1]
Total Authors: 7
Affiliation:
[1] Univ Sao Paulo, Polytech Sch, Min & Petr Engn Dept, Sao Paulo - Brazil
[2] Univ Sao Paulo, Polytech Sch, Transportat Engn Dept, Sao Paulo - Brazil
[3] Univ Sao Paulo, Polytech Sch, Construct Engn Dept, Sao Paulo - Brazil
[4] IAB Weimar gGmbH, Weimar Inst Appl Construct Res, Weimar - Germany
Total Affiliations: 4
Document type: Journal article
Source: JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T; v. 8, n. 1, p. 494-502, JAN-MAR 2019.
Web of Science Citations: 3
Abstract

This paper compares the use of jaw and impact secondary crushing for producing coarse recycled aggregates from concrete wastes, obtained from road pavement and demolished building materials. The crushing mechanism interferes directly with recycled aggregate properties at different levels: particle size distribution, aggregate shape, generation of micro-fractures, as well as regarding the detachment of porous hardened cement paste from particle surface in order to recover pure, non-porous natural aggregates. However, crusher selection in the recycling industry is mostly carried out by acquisition and maintenance costs, industry and manufacturer traditional habits, low cost associated with second hand equipment. It also does not consider essential parameters such as the final properties of the desired end-product. Representative samples from two recycling plants were collected after primary impact crusher and secondary crushing were performed in a controlled laboratory condition through jaw and impact crushers. The aggregates attained were characterized, demonstrating similar density, porosity, particle size distribution and content of attached cement paste. Minor observed differences do not justify the common belief in the industry that impact crushers provide an improvement in the quality of recycled aggregates due to the higher detachment of cement paste from aggregates. (C) 2018 Brazilian Metallurgical, Materials and Mining Association. Published by Elsevier Editora Ltda. (AU)

FAPESP's process: 09/01972-0 - Full Recycling of Concrete Pavements for Use as Aggregate for New Concrete Pavement Construction
Grantee:Ester Tseng
Support Opportunities: Scholarships in Brazil - Master