On the use of blast-furnace slag in sprayed concrete applications

Author(s)

Salvador, Renan P. ^{[1, 2]} ; Rambo, Dimas A. S. ^[1] ; Bueno, Roberto M. ^[1] ; Silva, Kaio T. ^[1] ; de Figueiredo, Antonio D. ^[2]

Affiliation

^[1] Univ Sao Judas Tadeu, Dept Civil Engn, 546 Taquari St, BR-03166000 Sao Paulo - Brazil

^[2] Univ Sao Paulo, Polytech Sch, Dept Civil Construct Engn, Prof Almeida Prado Av, Trav 2, 83, BR-05424970 Sao Paulo - Brazil

• Document type: Journal article
• Source: CONSTRUCTION AND BUILDING MATERIALS; v. 218, p. 543-555, SEP 10 2019.
• Web of Science Citations: 3

Abstract

Cement replacement by additions is crucial to produce sprayed concrete with proper mechanical properties and durability. The use of blast-furnace slag to produce sprayed concrete for tunnel linings may be restricted due to its low reactivity. In this context, the objective of this study is to evaluate the chemical and mechanical properties of sprayed concrete produced with cement and blast-furnace slag as a partial cement replacement. Hydration kinetics were characterized by isothermal calorimetry, X-ray diffraction and evolution of temperature, while mechanical properties were evaluated by needle penetration resistance and compressive strength of extracted cores. Results showed that slag was activated by the accelerators employed and the minimum strength specified for a J(2) class from 10 to 60 min and at 24 h was achieved. Therefore, blast-furnace slag may be used in sprayed concrete applications when the average strength evolution class is specified. (C) 2019 Elsevier Ltd. All rights reserved. (AU)

• FAPESP's process: 17/00125-9 - Characterization of chemical properties, mechanical performance and durability of sprayed concrete
• Grantee: Renan Pícolo Salvador
• Support Opportunities: Scholarships in Brazil - Post-Doctoral
• FAPESP's process: 14/50948-3 - INCT 2014: advanced eco-efficient technologies in cementitious products
• Grantee: Vanderley Moacyr John
• Support Opportunities: Research Projects - Thematic Grants