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Self-Healing Concrete using Encapsulated Bacterial Spores in a Simulated Hot Subtropical Climate

项目名称：	Self-Healing Concrete using Encapsulated Bacterial Spores in a Simulated Hot Subtropical Climate
摘要：	Concrete is one of the most commonly used construction materials in the world, due to its relatively low cost and high compressive strength. However, its weakness in tension makes it susceptible to cracking and thereby exposes any steel reinforcement to harmful agents that cause corrosion. Several techniques are currently used for crack-sealing, but with the current funding limitations, it is especially harder to afford the costly and labor-intensive maintenance and repair services needed to extend a structure�s service life. A potential solution is a bacterial concrete, which has become one of the most promising self-healing alternatives due to its capability to seal crack widths up to 1 mm by reacting directly with the cementitious matrix to form calcium carbonate. It is developed by adding alkali-resistant bacterial spores, which do not impose hazards to human health, in the concrete mixing process. Furthermore, microbial induced calcium carbonate precipitation is directly compatible with Portland cement materials and promotes economic and environmental benefits by increasing durability and water-tightness in concrete. In this study, the authors aim to develop an encapsulation procedure that will allow for testing two bacterial strains at varying dosages (by weight of cement) in concrete. The effects of encapsulated bacteria will be evaluated with respect to the crack-sealing efficiency observed, the effects on the intrinsic mechanical properties, as well as the self-healing processes over time after inducing damage. The concrete specimens will be cured in wet-dry cycles to determine their feasibility in region 6.
状态：	Completed
资金：	128930
资助组织：	Office of the Assistant Secretary for Research and Technology
管理组织：	Louisiana State University and A&M College
项目负责人：	Hassan, Marwa M
执行机构：	Louisiana Transportation Research Center
主要研究人员：	Rupnow, Tyson
开始时间：	20180315
预计完成日期：	20190915
实际结束时间：	20190915