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Development of Novel Cements with Optimized
Name: Development of Novel Cements with Optimized
File: unluer presentation 05-13-15 4B.pdf
Size(MB): 2.37MB
Extension: PDF
Event: 2015 ICSC - MIAMI
Speaker Name: Unluer, C.
Managed by: sdickens
Date Uploaded: May 29, 2015; 3:05 pm
Download Count: 525
Downloads This Month: 525

Your Geographic Information:

Country: United States
State/Region: Texas
City: Houston
Zip Code: 77072
Area Code: 281
Your IP: 34.204.200.74



Description:
"Currently produced at a rate of >3 Bt/year, Portland cement (PC) is the most widely used construction material in the world. It is responsible for 5-7% of anthropogenic CO2 emissions, due to a combination of the decomposition of limestone and high calcination temperatures used for the process (1450˚C). Therefore, there are major global pressures on the cement industry to reduce its emissions. Mineral CO2 sequestration, combining alkaline earth metals (i.e. Mg) with CO2 to form stable carbonates, is a safe and rapid approach for reducing industrial CO2 emissions. Reactive magnesia (MgO) cements have received significant attention in the technical press due to their technical and sustainability credentials over PC including their lower manufacturing temperatures (~700C); ability to sequester significant quantities of CO2, becoming carbon neutral and leading to high strengths; significant durability advantages; and complete recyclability when used alone.

The presented work focuses on the use of reactive MgO in porous applications, where it carbonates by absorbing CO2 and gains strength accordingly. The main goal involves maximizing the amount of CO2 absorbed within construction products, thereby reducing the overall impact of the construction industry. Microstructural analyses including scanning electron microscopy (SEM), X-ray diffraction (XRD) and thermogravimetry/differential thermal analysis (TG/DTA) are used in addition to porosity, permeability, and unconfined compressive strength (UCS) testing to understand the performance mechanisms. XRD Reference Intensity Ratio, acid digestion and TG/DTA are utilized to quantify the amount of CO2 sequestered, with the goal of achieving 100% carbonation through careful mix design, leading to a range of carbon neutral products with high strengths. As a result, blocks stronger than those of PC were produced, where up to 1 ton CO2/ton MgO was achieved in terms of CO2 sequestration. This was equivalent to the amount emitted during the production of MgO, therefore resulting in carbon neutral products."

 
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