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Development of Microcapsule-Based Self-Healing, High-Strength Engineered Cementitious Composites (SHHS-ECC)

Project Details
STATE

WA

SOURCE

RIP

START DATE

05/01/21

END DATE

06/30/22

RESEARCHERS

Xianming Shi

SPONSORS

Washington State University

KEYWORDS

Cement, Composite materials, Durability, High strength materials, Hydration, Mix designs, Pavement cracking, Sustainable development, Tensile properties

LINKS

Project webpage

Product

Project description

The durability of high-strength engineered cementitious composites (HS-ECC) is severely challenged once cracks are formed in a HS-ECC structural member, especially for those exposed to harsh environments (e.g., laden with chloride or sulfates). In this context, the goal of this project is to design a self-healing HS-ECC by virtue of microcapsules encapsulating healing agent. The multi-scale self-healing ability of the HS-ECC will be achieved through the combined use of microcapsules and continuous hydration of cementitious materials, so as to maintain the superior durability of HS-ECC. To this end, this exploratory laboratory investigation aims to: (1) identify the mix designs of HS-ECC incorporating microcapsules, based on the micromechanics theory (2) evaluate the self-healing effectiveness of HS-ECC, in terms of restoration level of tensile and transport properties (3) study the effect of crack width and pre-cracking age on the self-healing efficiency of HS-ECC.
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