Abstract
Generally, in most countries, there are no strict regulations regarding tire disposal. Hence, tires end up thrown in seas and lands as well as being burnt, harming the living beings, and are therefore considered a very dangerous pollution source for the environment. Over the past few years, several researchers have worked on incorporating shredded/powdered rubber tires into cement-based material. This strategy shows a dual functionality: Economic–environmental benefits and technological functionalization of the building material. Rubber-modified cement materials show interesting engineering and architectural properties due to the physical-chemical nature of the tire rubber aggregates. However, the abovementioned performances are affected by type, size, and content of polymer particles used in the cement-based mixtures production. Whereas an increase in the rubber content in the cement mix will negatively affect the mechanical properties of the material as a decrease in its compression strength. This aspect is crucial for the use of the material in building applications, where proper structural integrity must be guaranteed. In this context, the development of innovative manufacturing technologies and the use of multi-physics simulation software represent useful approaches for the study of shapes and geometries designed to maximize the technological properties of the material. After an overview on the performances of 3D printable rubber-cement mixtures developed in our research laboratory, a preliminary experimental Finite Element Method (FEM) analysis will be described. The modeling work aims to highlight how the topology optimization allows maximizing of the physical-mechanical performances of a standard rubber-cement component for building-architectural applications.
Highlights
Recycling processes, applied to the construction industry, aim to save the environment by reducing the need for extracting, refining, and processing mineral aggregates, as well as reducing wastes that have a negative impact as harmful chemicals and greenhouse gasses
According to the experimental results discussed in the previous section, P-G50/50 mix properties wereAscecloecrtdeidngastionptuhtemeaxtepreirailmdeantatailn rFeEsMul-tbsasdeidscmusescehdaniincalthaenaplyrseivsi(oTuasblese3c)t.ion, P-G50/50 mix properties were selected as input material data in Finite Element Method (FEM)-based mechanical analysis (Table 3)
The presence of the double polymer grain size in the mixture ensures lower loss in mechanical strength compared to the neat cementitious material, maintaining satisfactory deformability, toughness, and porosity properties
Summary
Recycling processes, applied to the construction industry, aim to save the environment by reducing the need for extracting, refining, and processing mineral aggregates, as well as reducing wastes that have a negative impact as harmful chemicals and greenhouse gasses. This effect inevitably promotes soil pollution and the spread of many diseases [2,3] Burning is another method for tire disposal, but the high temperatures involved in the thermal treatment imply the uncontrolled release of toxic gas and benzene compounds, potentially harmful to living beings and atmosphere [2]. In this paragraph, some research works are reported showing theoretical/experimental studies on the morphological optimization of structural elements (hollow blocks, bricks, perforated sheets). Comparing several types of perforation patterns, the hexagonal one provided the best mechanical strength performances
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