详情

Beneficiation of High Sulfur Fly Ashes and Quarry Fines for Sustainable Ternary Concrete Mixtures

项目名称：	Beneficiation of High Sulfur Fly Ashes and Quarry Fines for Sustainable Ternary Concrete Mixtures
摘要：	With an estimated 50% of all concrete produced containing some continuous flight auger (CFA) [6,7] and when CFA demand for use in concrete is increasing [1] while its supply is decreasing [9,10], it is evident that viable alternatives are necessary now and in the future for sustaining the production of durable and sustainable (low CO₂) concrete. This research will develop a ternary cement (e.g., ASTM C595 Type IT cement) that 3 combines the widely available high SO₃ CFA and quarry fines to reduce the Portland cement content of concrete by 50% or more. This new cement will be compliant with ASTM C595 and as such, will be immediately usable by concrete producers. Additionally, the availability of high SO₃ CFA and quarry fines would supplement the existing supply of conventional SCMs and allow the industry to proceed with its construction operations uninterrupted while meeting ambitious sustainability targets with respect to CO₂ emissions. In addition, there could be materials cost savings, even after beneficiation of these SCMs, given that they are currently discarded as waste materials. This research will explore the design and performance evaluation of a new ASTM C595 Type IT blended cement that includes high SO₃ CFA and quarry fines. The specific objectives are: (1) Characterization of high SO₃ CFA and quarry fines in terms of their composition, mineralogy, physical properties, and pozzolanic reactivity. (2) Designing and developing a new Type IT cement containing high SO₃ CFA and quarry fines to reach at least 95% of the compressive strength of a control Type IT cement at 28 days. (3) Evaluating the impact of this new cement on fresh properties of concrete, including workability, setting time, and admixture performance. (4) Studying the durability performance of concrete made with the new cement blend.
状态：	Active
资金：	VTIFed/Match$75,000/$75000PSUFed/Match$58461/$5896
资助组织：	Office of the Assistant Secretary for Research and Technology
管理组织：	Center for Integrated Asset Management for Multimodal Transportation Infrastructure Systems (CIAMTIS)
项目负责人：	Donnell, Eric T
执行机构：	Virginia Polytechnic Institute and State University, Blacksburg<==>Pennsylvania State University, University Park
主要研究人员：	Brand, Alexander S；Rajabipour, Farshad；Kaladharan, Gopakumar
开始时间：	20220310
预计完成日期：	20230909
主题领域：	Construction；Highways；Materials；Pavements