Is Concrete a Green Building Material?

Is Concrete a Green Building Material?

Is Concrete a Green Building Material? The Emergy and Environmental Impact What is Emergy? Phrase originally coined by Professor Howard T. Odom in 1986 Emergy can be defined as the total solar equivalent available energy of one form that was used up and directly and indirectly in the work of making a product or service. (Odom, 1996) Measured by scientific unit Emjoule Embodied Energy, established as a means to understand and evaluate the energy involved in the

production and destruction of a particular material Concrete Production Patented in England by Joseph Aspdin in 1824, resembled Isle of Portland quarried Stone 75- 90 million tons of Concrete production per year in the last decade (Portland Cement Ass.) Cement production involves the mixture of Limestone, clay/sand, bauxite, iron ore in a rotary cement kiln:

Kiln rotates slowly mixing contents progressively getting hotter to reach temperatures up to 2700 Largest piece of moving industrial equipment in the world Concrete is made up of: 1. 2. 3. 4. Portland Cement 12% Sand 34%

Crushed Stone 48% Water 6% Emergy Efficiency It takes 2,300 to 3,500 pounds of raw materials to produce one ton (2,000#) of cement. Cement is the most energy intensive component of concrete and all industrial manufacturing processes, 92% of emergy in concrete Cement production takes about six million BTus for every ton of cement; includes direct fuel for mining and transporting raw materials Pros of Concrete Creates sustainable Sites Enhances energy performance Contains recycled material (fly-ash, slag cement, etc.) Cement kiln burn hazardous waste

materials as fuel; high temp = complete combustion and decrease pollution Manufactured Locally Builds durable structures LEED Certified as Green building material Utilizing concrete in commercial buildings offers up to 25 certification points. Cons of Concrete Concrete accounts for up to 67% by weight, 53% by volume of C&D Solid Wasteand only 5% avg. is recycled! Tons of C02 per ton of cement in the combustion of fossil fuel

Additional CO2 released in calcining; turning limestone into lime Dust & Air pollution via Kiln; manufacturing, transportation, etc H2O pollution as high PH or Alkaline water toxic to marine wildlife New add-mixtures increase chemicals within concrete to control; setting time, plasticity, pump-ability, water content, strength, and color. Despite the Alkalinity when wet, traditionally concrete is very safe and chem free Solutions and Recommendations Fly-Ash; reduce solid waste and reduce overall energy use as cement substitute Increase concrete strength Improve sulfate resistance Decrease permeability

Increase overall workability of concrete Increase waste fuel used by Kiln; 50% Switch to lower CO2 fuels; Natural gas and Ag. Waste Utilize Pre-cast concrete structures to reduce dust and H20 pollution Minimize the amount of concrete use by buildings and focus on the strategic use of the material to provide maximum structural support and minimal environmental degradation Sources http://www.buildinggreen.com eMergy Evaluation Howard T. Odom, Environmental Engineering

Sciences, University of Florida, Gainsville. May 27, 1998. http://en.wikipedia.org/wiki/Emergy http:// www.cement.org/buildings/green_lee d.asp http://www.usgbc.org/ Emergy indices and ratios for sustainable material cycles and recycle options M.T. Brown, Vorasun Buranakarn, July 2002.

Recently Viewed Presentations

  • Earth's 4 Spheres Foldable (how to)

    Earth's 4 Spheres Foldable (how to)

    Procedure. Step 1 : Take pre-ran foldable handout (teacher passed out to you) and put your name on both sides (left/right) of the foldable. Step 2: Cut the foldable on the long dotted, center line (one in the middle) so...
  • Fight the Bite!

    Fight the Bite!

    - the part of the mosquito between the head and the abdomen, where the wings and legs attach. Abdomen - part of the mosquito's body that hangs from the thorax and serves as the mosquito's stomach and lungs, holds the...
  • Safe Operation of Forklifts - Washington

    Safe Operation of Forklifts - Washington

    Safe Operation of Forklifts and other powered industrial trucks (PITs) May, 2011 Correct answer is "go down the incline backwards" * The correct answer is "pull your arms in and hold on" * The correct answer is "inform maintenance or...
  • GRASP - Graduate Research Advanced Skills Program RESEARCH

    GRASP - Graduate Research Advanced Skills Program RESEARCH

    Outline the methodology/methods used in data collection and analysis. Indicate findings and discuss/interpret findings. Present possible implications of findings . he . findings . Suggest the significance of this contribution to research in the field. Possibly indicate the limitations of...
  • Outline - Brigham Young University

    Outline - Brigham Young University

    Tip #11: Standard Integer typedefs. The actual size of integer types varies by implementation. The standard only requires size relations between the data types (i.e., a long longis not smaller than long, which is not smaller than int, which is...
  • PowerPoint Templates - Peter Liljedahl

    PowerPoint Templates - Peter Liljedahl

    STUDENTING [T]hings that students do such as 'psyching out' teachers, figuring out how to get certain grades, 'beating the system', dealing with boredom so that it is not obvious to teachers, negotiating the best deals on reading and writing assignments,...
  • DHS PowerPoint template - all slides - save a copy and edit it

    DHS PowerPoint template - all slides - save a copy and edit it

    Copies of time reporting policies and procedures from the following counties are being provided to you: Crow Wing, Meeker, Nobles, Pope, St. Louis, Sherburne, Wabasha and Wright. Review these and take the words/phrases that would work in creating the policy...
  • Implementing a Compiler based I/O prefetching system for Linux

    Implementing a Compiler based I/O prefetching system for Linux

    Implementing a Compiler based I/O prefetching system for Linux CS 15-712 Course Project Amit Kumar Manjhi Mahim Mishra Introduction For large scientific applications, working set often exceeds size of available physical memory Result: large page fault penalties for access to...