HEALING AGENT FOR SELF-HEALING CEMENTIOUS MATERIAL
First Claim
1. A particulate healing agent for a cementious material, comprising coated particles having a mean diameter in the range of 0.2-4 mm and a coating thickness in the range of 5 μ
- m-2 mm and comprising;
(a) a bacterial material selected from the group consisting of bacterium, lyophilized bacterium and bacterial spore of bacterium; and
(b) an additive;
wherein the coated particles comprise at least 50 wt. % bacterial material and additive, relative to total weight of the coated particles, andwherein the coating is configured to protect the particles during production of the cementious material comprising the particulate healing agent, but the particles are configured to break when cracks are formed during hardening of the cementious material to release the particulate healing agent into the cracks to at least partially heal the cracks.
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Abstract
The invention provides a process for the production of a cementious material. The process comprises mixing cement starting materials and a particulate healing agent to provide the cementious material. The healing agent comprises coated particles, wherein the coated particles comprise bacterial material and additive. The bacterial material is selected from the group consisting of a bacterium, a lyophilized bacterium and a bacterial spore of a bacterium. The present invention solves these problems, as (substantially leakage-proof) tablets containing the actual healing agent may neither interfere with either the workability of the liquid mixture (“cementious material”) nor negatively affect properties of either mixture or final material (hardened concrete), even when applied in large quantities. During crack formation in cementious based constructions, the particles also crack, and healing agent is released.
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Citations
26 Claims
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1. A particulate healing agent for a cementious material, comprising coated particles having a mean diameter in the range of 0.2-4 mm and a coating thickness in the range of 5 μ
- m-2 mm and comprising;
(a) a bacterial material selected from the group consisting of bacterium, lyophilized bacterium and bacterial spore of bacterium; and (b) an additive; wherein the coated particles comprise at least 50 wt. % bacterial material and additive, relative to total weight of the coated particles, and wherein the coating is configured to protect the particles during production of the cementious material comprising the particulate healing agent, but the particles are configured to break when cracks are formed during hardening of the cementious material to release the particulate healing agent into the cracks to at least partially heal the cracks. - View Dependent Claims (2, 3, 4, 5, 6, 8, 9, 10, 25, 26)
- m-2 mm and comprising;
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7. (canceled)
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11. (canceled)
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12. A particulate healing agent for a cementious material, comprising coated particles having a mean diameter in the range of 0.2-4 mm and a coating thickness in the range of 5 μ
- m-2 mm and comprising;
(a) a bacterial material selected from the group consisting of bacterium, lyophilized bacterium and bacterial spore of bacterium; and (b) an additive, wherein coating comprise a (co)polymer-based coating, and wherein the coated particles comprise at least 50 wt. % bacterial material and additive, relative to total weight of the coated particles, and wherein the coating is configured to protect the particles during production of the cementious material comprising the particulate healing agent, but the particles are configured to break when cracks are formed during hardening of the cementious material to release the particulate healing agent into the cracks to at least partially heal the cracks. - View Dependent Claims (13, 14, 15, 16, 18, 19)
- m-2 mm and comprising;
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17. (canceled)
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20. (canceled)
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21. A cementious-based construction comprising hardened cementious material, the hardened cementious material further comprising bacterial material, wherein the bacterial material is selected from the group consisting of a bacterium, a lyophilized bacterium and a bacterial spore of a bacterium, wherein the bacterium is selected from the group of genera consisting of Planococcus, Bacillus and Sporosarcina and wherein the weight ratio hardened cementious material and bacterium is in the range of 1.106:
- 1-1.108;
1. - View Dependent Claims (22, 23, 24)
- 1-1.108;
Specification