RETRACTED: Influence of polypropylene fibres and silica fume on the mechanical and fracture properties of ultra-high-performance geopolymer concrete

Abstract

This article has been retracted: please see Elsevier Policy on Article Withdrawal ( https://www.elsevier.com/about/our-business/policies/article-withdrawal ). This article has been retracted at the request of the Editors-in-Chief. Following receipt of whistle-blower complaints, an investigation of this and related papers was conducted. The Editor-in-Chief no longer has confidence in the scientific integrity of this paper. This paper contains multiple instances of the use of unattributed third party images. Figure 1 is a ‘catalogue’ image that can be found in multiple locations on the internet and therefore may not be a true representation of the fibre material used in this study. Figure 2 was published previously in an unrelated study [ https://doi.org/10.1590/S1983-41952018000500006 ]. Figure 11 is an image that has appeared in various locations on the internet and in published academic papers; its provenance is not known. In addition, this image has been manipulated (without acknowledgement) in this paper. Unattributed use of images and unacknowledged image manipulation are violations of COPE publishing ethics guidelines and can have the effect of distorting the scientific record. Communication with the corresponding author raised further concerns with the integrity of this work to the extent that he has expressed that he no longer has confidence in its content.