Engineered self healing cementitious composites
First Claim
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1. A self-healing fiber-reinforced cementitious composite comprising:
- a cementitious matrix; and
a plurality of discontinuous short fibers having a volume fraction from about 1% to about 4%, said plurality of discontinuous short fibers being generally uniformly-distributed within said cementitious matrix, said plurality of discontinuous short fibers maintaining a persistent self-controlled crack width below 150 μ
m,wherein said composite exhibiting strain-hardening behavior under tension with at least 1% strain capacity, said composite having compressive strength in excess of 20 MPa, and said composite self-sealing said persistent self-controlled crack in a variety of environmental conditions.
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Abstract
Cementitious composites engineered for self-healing, combining self-controlled tight crack width and extreme tensile ductility. Self-healing takes place automatically at cracked locations without external intervention. In the exemplary embodiment, fiber-reinforced cementitious composites with self-controlled tight crack width less than 50 μm and tensile ductility more than 2% are prepared. Self-healing in terms of mechanical and transport properties recovery of pre-damaged (by pre-cracking) composite is revealed in a variety of environmental exposures, include wetting and drying cycles, water permeation, and chloride submersion.
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17 Claims
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1. A self-healing fiber-reinforced cementitious composite comprising:
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a cementitious matrix; and a plurality of discontinuous short fibers having a volume fraction from about 1% to about 4%, said plurality of discontinuous short fibers being generally uniformly-distributed within said cementitious matrix, said plurality of discontinuous short fibers maintaining a persistent self-controlled crack width below 150 μ
m,wherein said composite exhibiting strain-hardening behavior under tension with at least 1% strain capacity, said composite having compressive strength in excess of 20 MPa, and said composite self-sealing said persistent self-controlled crack in a variety of environmental conditions. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A self-healing fiber-reinforced cementitious composite comprising:
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a cementitious matrix; and a plurality of discontinuous short fibers having a volume fraction from about 1% to about 4% and an average length of 4 to 30 mm, said plurality of discontinuous short fibers being generally uniformly-distributed within said cementitious matrix, wherein said composite having a persistent self-controlled crack width below 150 μ
m thereby permitting self-sealing of said persistent self-controlled crack, said composite exhibiting strain-hardening behavior under tension with at least 1% strain capacity, and said composite having compressive strength in excess of 20 MPa. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
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Specification