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Application of Bioengineering in Construction

Open Journal of Civil Engineering 2024年第3期14卷 391-404页

作者： sassan mohasseb Atiyeh Meidanchi Sonia Daneshgari Department of Energy Engineering Smteam GmbH Zurich Switzerland Department of Leadership Western Trinity University Vancouver Canada

Bio-cement and bio-concrete are innovative solutions for sustainable construction, aiming to reduce environmental impact while maintaining the durability and versatility of building materials. Bio-cement is an eco-friendly alternative to traditional cement, produced through Microbially Induced Calcium Carbonate Precipitation (MICP), which mimics natural biomineralization processes. This method reduces CO2 emissions and enhances the strength and durability of construction materials. Bio-concrete incorporates bio-cement into concrete, creating a self-healing material. When cracks form in bio-concrete, dormant bacteria within the material become active in the presence of water, producing limestone to fill the cracks, extending the material’s lifespan and reducing the need for repairs. The environmental impact of traditional cement production is significant, with cement generation accounting for up to 8% of global carbon emissions. Creative solutions are needed to develop more sustainable construction materials, with some efforts using modern innovations to make concrete ultra-durable and others turning to science to create affordable bio-cement. The research demonstrates the potential of bio-cement to revolutionize sustainable building practices by offering a low-energy, low-emission alternative to traditional cement while also addressing environmental concerns. The findings suggest promising applications in various construction scenarios, including earthquake-prone areas, by enhancing material durability and longevity through self-repair mechanisms.

关键词： Sustainable Construction Microbially Induced Calcium Carbonate Precipitation (MICP) Cement Construction Industry Microorganisms Eco-Friendly Sustainable Solution Durability Carbon Dioxide Emission (CO2)

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The Effects of Nanoparticle Additives on Thermophysical Properties of Concrete Mixtures

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Open Journal of Civil Engineering 2022年第4期12卷 587-614页

作者： Kamran Rahmati Shadbad Ali Foroughi-Asl Siamak Talatahari sassan mohasseb Faculty of Civil Engineering University of Tabriz Tabriz Iran ETH SMTEAM GmbH Meilen Switzerland

In recent years, energy-retrofitting is becoming an imperative aim for existing buildings worldwide and increased interest has focused on the development of nanoparticle blended concretes with adequate mechanical properties and durability performance, through the optimization of concrete permeability and the incorporation of the proper nanoparticle type in the concrete matrix. In order to investigate the potential use of nanocomposites as dense barriers against the permeation of liquids into the concrete, three types of nanoparticles including Zinc Oxide (ZnO), Magnesium Oxide (MgO), and composite nanoparticles were used in the present study as partial replacement of cement. Besides, the effect of adding these nanoparticles on both pore structure and mechanical strengths of the concrete at different ages was determined, and scanning electron microscopy (SEM) images were then used to illustrate the uniformity dispersion of nanoparticles in cement paste. It was demonstrated that the addition of a small number of nanoparticles effectively enhances the mechanical properties of concrete and consequently reduces the extent of the water permeation front. Finally, the behavioral models using Genetic Algorithm (GA) programming were developed to describe the time-dependent behavioral characteristics of nanoparticle blended concrete samples in various compressive and tensile stress states at different ages.

关键词： Nanoparticle Blended Concretes Zinc Oxide (ZnO) Magnesium Oxide (MgO) Composite Nanoparticles Genetic Algorithm (GA) Programming Time-Dependent Behavioral Model

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