Estela Oliari Garcez

Micromechanics-Based Optimization of Pigmentable Strain-Hardening Cementitious Composites

AbstractArchitectural and decorative concrete (ADC) has become an enormously popular product for both building interiors and exteriors, combining an aesthetic finish with structural capabilities. Cracking and chipping of ADC product during handling and transportation, however, is of great concern due to the brittleness of ADC materials. This paper looks at the development of a white strain-hardening cementitious composite (SHCC) as an alternative ADC material to address the above-mentioned challenges. It was found that the replacement of ordinary portland cement and fly ash with white cement altered SHCC microstructure which is unfavorab to the tensile strain-hardening behavior. A micromechanical model was engaged for composite optimization through ingredients selection and component tailoring to reengineer white SHCCs.

ASSESSMENT OF MIX PROPORTIONS FOR DEVELOPING LIGHTWEIGHT CEMENTITIOUS COMPOSITES WITH WOOD WASTES

1 Received on 20.01.2016 accepted for publication on 11.11.2016. 2 Universidade Federal do Rio Grande do Sul, Departamento Interdisciplinar, Tramandaí, RS Brasil. E-mail: <monica.garcez@ufrgs.br>. 3 Universidade Federal de Pelotas, Centro de Engenharias, Pelotas, RS Brasil. E-mail: <estelagarcez@gmail.com>. 4 Universidade Federal de Pelotas, Graduanda em Engenharia Civil, Pelotas, RS Brasil. E-mail: <ali.oli.edi@bol.com.br>. 5 Universidade Federal de Pelotas, Engenharia Industrial Madeireira, Pelotas, RS Brasil. E-mail: <darcigatto@yahoo.com>. *Corresponding author.

Modelo dinâmico de sistemas para o gerenciamento de resíduos da construção civil na cidade de Porto Alegre: estudo de caso

This work presents the development of a system dynamic model for the use of recycled material from construction and demolition waste in the production of non-structural concrete blocks, using the software Stella for modeling of parameters. The modeling allows the individual analysis of the production process parameters, serving as a base for the definition of critical activities and possibilities for the improvement and optimization of the production. The modeling is also a validation criterion to ensure an efficient reuse of construction waste, given the current regulations, environmental and technical specifications. This study resulted in a conceptual analysis model considering several variables related to the production process. It was possible to demonstrate that the use of construction and demolition waste is a feasible social and environmental activity with economic potential.