This work evaluates mortars using sewage sludge calcined at temperatures of 600°C and 700°C as a hydraulic binder replacing the cement. The percentages incorporated by mass to replace the Portland cement were 10%, 20% and 30%, using the 1:3:0,60 (cement: sand: factor a/c) trace. Sludge ash was characterized and tensile strength at flexion as well as tensile strength (pullout test) were evaluated. As a way of performing a comparison with conventional mortars, the same tests were carried out using reference mortar. The results of the flexural tensile strength tests indicated that results were higher than the reference traces of the mortars with the calcined sludge at a temperature of 700°C, a factor related to the increase of the calcination temperature and the incorporated percentage. With respect to the tests on the determination of tensile strength, it was observed that the specimens submitted to the test suffered rupture in the mortar, and that the calcination temperature of the sewage sludge was not influenced. The results obtained with the mortars using sewage sludge ash with partial replacement of the cement are shown within the normative standards and approximate to the results obtained with the tests executed with the reference mortar.
For many years there has been an accommodation by the construction industry because it is believed to be a craft, rustic activity, being considered cautious and even inappropriate for the insertion of new building systems. Nowadays, the reduction of costs and lead times, as well as the increase of profit margins, are the main goals of construction companies owners, where in the construction industry, in the vast majority of projects, the speed of construction and the use of new technologies are market demands, which makes it more competitive. The challenging globalized scenario encourages the standardization of future development guidelines for all industries in the country, particularly construction. This paper presents the industrialized construction as well as the constructive characteristics of this system and the expectations of its wide use in the construction industry through a study of case in a work placed in Santa Rita, Paraíba. The project is part of the Minha Casa Minha Vida Program of the Federal Government.
Through environmental policies that provide a gradual discussion about the disposal of waste produced in the most diverse industrial sectors, sewage sludge is emphasized by the problematic destination of the toxic compounds that compose it, compromising its disposal. Based on the need to implement measures to mitigate environmental impacts through the production of eco-efficient materials, the application of the ashes of sanitary sewage sludge as a partial substitute for Portland cement is currently being used as a coating mortars study. This replacement has a focus, besides reducing the large volume of sludge generated by Sewage Treatment Plants, to allow an attenuation in the consumption of cement, a large CO2 generator during its manufacturing process. It could be observed that the use of the calcined residue applied in mortar, ratifies a relevant physical-mechanical performance to the material, which compared to the material without the use of it, has better results coming from its reactivity provided by action of the thermal process of degradation.
A indústria da construção civil é bastante relevante no contexto socioeconômico brasileiro e mundial. Contudo, sua atividade caracteriza-se por exercer pressões no meio ambiente, seja pelo consumo de recursos naturais, seja pela geração de somas de resíduos ou por mudanças na paisagem decorrentes do descarte irregular desses. Problemas relacionados a geração de Resíduos da Construção Civil (RCC) se agravam rapidamente e veem sendo debatidos, sendo o discurso centrado em ações de gerenciamento dos RCCs no canteiro de obras ou opções pela reciclagem e/ou reuso, mas poucas experiências foram realizadas utilizando BIM (Building Information Modeling) para minimizar a sua geração. Este artigo faz parte de uma pesquisa de mestrado e restringir-se-á a apresentar uma revisão sistemática da literatura, realizada como etapa inicial da dissertação, analisando a produção científica sobre o uso do BIM na minimização da geração de RCCs, no período de 2009-2017, onde foram selecionadas e analisadas dez publicações relevantes. Utilizou-se métodos de estudos sistemáticos, com natureza descritiva e abordagem qualitativa. Como resultado, identificou-se que o estágio atual do conhecimento acadêmico de BIM na minimização da geração de RCCs está voltado às fases de concepção e projeto e que as pesquisas acadêmicas têm um caráter para propor e validar inovações.
Based on the environmental assumptions that permeate the role of researchers in enabling the use of waste in consumer goods, using sewage sludge in human consumption material has become the object of worldwide study because of the potential that it carries. Aiming to fulfill the sustainable role through the creation of mechanisms that favor the ecological coexistence between environment and human beings, the use of the calcined sewage sludge as a potentiator in the properties of the material is made possible through the construction materials, behavior. Coating mortars are currently evaluated by exposing, from the replacement of the cement by the calcined material, an effective applicability with respect to its resistance to deleterious agents. It is understood that to idealize unconventional materials with the use of residues that have high degradation power to the environment, ratifies the attempt to mitigate large and irreversible environmental impacts arising from improper and poorly planned disposal.
Through the environmental perspective of producing new construction materials with the inclusion of tailings or residues that improve their properties and, at the same time, promote a practice that mitigates environmental impacts, the objective of this work is to diagnose the effect of incorporating scheelite- tailings as recycled aggregate in soil-cement bricks, partially replacing the soil, seeking to make its use feasible in interlocking pavements, as well as studying the physical-chemical properties of the mixing water used in the making of soil-cement bricks, originating from drains air conditioning system at IFPB Campus Campina Grande. The bricks produced used CP II Z-32 class cement, landfill cut-off soil for disposal, scheelite-tailings, and kneading water from air conditioning drains at the IFPB Campus Campina Grande. Conformation was performed manually with the aid of a hydraulic press, with subsequent curing at room temperature and periodic wetting during the first 7 days of cement hydration (alkaline stabilizer), until the ages of laboratory tests of compressive strength reached (28 days) and direct flexion (180 days). It was noted that the results of compressive strength exceeded the minimum limits of ABNT NBR 10834:2013, as well as the results of the flexion test demonstrated that the mechanical strength of the bricks is superior when incorporating the mineral tailings, a phenomenon also noticed through of the compressive strength test. The quality of the water used to manufacture the bricks, in addition to ensuring better chemical potential in the hydration reaction based on the state of the art, promotes a reduction in the use of water from the public supply, which comes from a relatively low water source.
Through environmental policies that provide a gradual discussion about the destination of the tailings produced in the most diverse industrial sectors, the sewage sludge is emphasized by the problematic destination arising from the amount of toxic compounds that compose it, compromising its disposal. Aiming to fulfill the sustainable role through the creation of mechanisms that favor the ecological coexistence between environment and human beings, it is possible through the use of construction materials, considered as conventional, the use of calcined sewage sludge as an enhancer of the properties of matrix materials cement, significantly improving its performance against mechanical stresses and degradation mechanisms. Based on the need to implement measures to mitigate environmental impacts through the production of eco-efficient materials, the ashes of sanitary sewage sludge as a partial substitute for Portland cement have now been used as an input in coating mortars. This substitution focuses on reducing the large volume of sludge generated by the Sewage Treatment Plants, as well as on the reduction in the consumption of cement, a large CO2 generator during its manufacturing process. It was observed that through the use of this calcined by-product applied in mortars, a relevant physical-mechanical performance in cementitious materials is ratified, that in comparison to the material without the use of it, better results are observed, resulting from the reactivity conferred to the sludge after the thermal degradation process, making it a pozzolana.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
hi@scite.ai
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.