91 resultados para sustainable nanoscience
em Iowa Publications Online (IPO) - State Library, State of Iowa (Iowa), United States
Resumo:
For a variety of reasons, the concrete construction industry is not sustainable. First, it consumes huge quantities of virgin materials. Second, the principal binder in concrete is portland cement, the production of which is a major contributor to greenhouse gas emissions that are implicated in global warming and climate change. Third, many concrete structures suffer from lack of durability which has an adverse effect on the resource productivity of the industry. Because the high-volume fly ash concrete system addresses all three sustainability issues, its adoption will enable the concrete construction industry to become more sustainable. In this paper, a brief review is presented of the theory and construction practice with concrete mixtures containing more than 50% fly ash by mass of the cementitious material. Mechanisms are discussed by which the incorporation of high volume of fly ash in concrete reduces the water demand, improves the workability, minimizes cracking due to thermal and drying shrinkage, and enhances durability to reinforcement corrosion, sulfate attack, and alkali-silica expansion. For countries like China and India, this technology can play an important role in meeting the huge demand for infrastructure in a sustainable manner.
Resumo:
Sustainable Concrete Pavements: A Manual of Practice is a product of the National Concrete Pavement Technology Center at Iowa State University’s Institute for Transportation, with funding from the Federal Highway Administration (DTFH61-06-H-00011, Work Plan 23). Developed as a more detailed follow-up to a 2009 briefing document, Building Sustainable Pavement with Concrete, this guide provides a clear, concise, and cohesive discussion of pavement sustainability concepts and of recommended practices for maximizing the sustainability of concrete pavements. The intended audience includes decision makers and practitioners in both owner-agencies and supply, manufacturing, consulting, and contractor businesses. Readers will find individual chapters with the most recent technical information and best practices related to concrete pavement design, materials, construction, use/operations, renewal, and recycling. In addition, they will find chapters addressing issues specific to pavement sustainability in the urban environment and to the evaluation of pavement sustainability. Development of this guide satisfies a critical need identified in the Sustainability Track (Track 12) of the Long-Term Plan for Concrete Pavement Research and Technology (CP Road Map). The CP Road Map is a national research plan jointly developed by the concrete pavement stakeholder community, including Federal Highway Administration, academic institutions, state departments of transportation, and concrete pavement–related industries. It outlines 12 tracks of priority research needs related to concrete pavements. CP Road Map publications and other operations support services are provided by the National Concrete Pavement Technology Center at Iowa State University. For details about the CP Road Map, see www.cproadmap. org/index.cfm.
Resumo:
The Leopold Center was created by the Iowa Legislature as part of the Iowa Groundwater Protection Act of 1987. The Leopold Center believes contribute to a healthy ways of thinking about markets for Iowa farmers, a better understanding of local ecosystems, public policies and economic practices, and partnerships with consumers.
Resumo:
The Leopold Center was established by the Iowa Legislature as part of the Iowa Groundwater Protection Act of 1987. Its mandated missions are to identify impacts of agricultural practices, contribute to the development of profitable farming systems that conserve natural resources, and cooperate with Iowa State University Extension to inform the public of new findings.Information for this report was compiled by Leopold Center staff with the help of its researchers and educators who are committed to improving Iowa agriculture and the lives of Iowans.
Resumo:
The Leopold Center was created by the Iowa Legislature as part of the Iowa Groundwater Protection Act of 1987. The Leopold Center believes contribute to a healthy ways of thinking about markets for Iowa farmers, a better understanding of local ecosystems, public policies and economic practices, and partnerships with consumers.
Resumo:
The Leopold Center was created by the Iowa Legislature as part of the Iowa Groundwater Protection Act of 1987. The Leopold Center believes contribute to a healthy ways of thinking about markets for Iowa farmers, a better understanding of local ecosystems, public policies and economic practices, and partnerships with consumers.
Resumo:
The Leopold Center was created by the Iowa Legislature as part of the Iowa Groundwater Protection Act of 1987. The Leopold Center believes contribute to a healthy ways of thinking about markets for Iowa farmers, a better understanding of local ecosystems, public policies and economic practices, and partnerships with consumers.
Resumo:
The Leopold Center was created by the Iowa Legislature as part of the Iowa Groundwater Protection Act of 1987. The Leopold Center believes contribute to a healthy ways of thinking about markets for Iowa farmers, a better understanding of local ecosystems, public policies and economic practices, and partnerships with consumers.
Resumo:
The Leopold Center was created by the Iowa Legislature as part of the Iowa Groundwater Protection Act of 1987. The Leopold Center believes contribute to a healthy ways of thinking about markets for Iowa farmers, a better understanding of local ecosystems, public policies and economic practices, and partnerships with consumers.
Resumo:
The Leopold Center was created by the Iowa Legislature as part of the Iowa Groundwater Protection Act of 1987. The Leopold Center believes contribute to a healthy ways of thinking about markets for Iowa farmers, a better understanding of local ecosystems, public policies and economic practices, and partnerships with consumers.
Resumo:
The Leopold Center was created by the Iowa Legislature as part of the Iowa Groundwater Protection Act of 1987. The Leopold Center believes contribute to a healthy ways of thinking about markets for Iowa farmers, a better understanding of local ecosystems, public policies and economic practices, and partnerships with consumers.
Resumo:
The Leopold Center was created by the Iowa Legislature as part of the Iowa Groundwater Protection Act of 1987. The Leopold Center believes contribute to a healthy ways of thinking about markets for Iowa farmers, a better understanding of local ecosystems, public policies and economic practices, and partnerships with consumers.
Resumo:
The Leopold Center was created by the Iowa Legislature as part of the Iowa Groundwater Protection Act of 1987. The Leopold Center believes contribute to a healthy ways of thinking about markets for Iowa farmers, a better understanding of local ecosystems, public policies and economic practices, and partnerships with consumers.
Resumo:
The Leopold Center was created by the Iowa Legislature as part of the Iowa Groundwater Protection Act of 1987. The Leopold Center believes contribute to a healthy ways of thinking about markets for Iowa farmers, a better understanding of local ecosystems, public policies and economic practices, and partnerships with consumers.
Resumo:
The Leopold Center was established by the Iowa Legislature as part of the Iowa Groundwater Protection Act of 1987. Its mandated missions are to identify impacts of agricultural practices, contribute to the development of profitable farming systems that conserve natural resources, and cooperate with Iowa State University Extension to inform the public of new findings.Information for this report was compiled by Leopold Center staff with the help of its researchers and educators who are committed to improving Iowa agriculture and the lives of Iowans.
