Self-repairing concrete used urea-formaldehyde resin polymer micro-capsules and method for fabricating same 

United States Patent（美国专利号）： 8552092

Abstract：A self-repairing concrete includes urea-formaldehyde resin polymer micro-capsules, in which the urea-formaldehyde resin polymer micro-capsules are mixed for a fixed function of micro-cracks. The quality mixture ratio is: concrete/micro capsules/water=100:1-15:15-50. The manufacturing method is weighing a full amount of water in a container, adding urea-formaldehyde resin polymer micro-capsules, stirring, until fully dispersed microcapsules; pouring the water into the mixing container, adding the corresponding quality of cement; stirring; adding sand and gravel filling materials, conducting worksite watering, 1/3 volume for each time, vibrating, and air exhausting; until the paste filling mold.

Background:during the country's modernization construction, concrete is still an indispensable building materials. Due to the use of long-term process and under the influence of the surrounding complex environment, in-service concrete structures is producing micro-cracking and local damage inevitably, which would reduce the life of the structures lightly, or would threaten structures safety.If the cracks or damages cannot be timely and effectively restoration, the structure will not only affect the normal use of the performance and shorten the life,Existing technologies can not improve the solution of concrete micro-cracks self-diagnosing and self-repairing the problems. The self-repairing of the concrete is conducted by adding special components (such like shape memory alloy) to form intelligent self-repairing system that can be automatically triggered to fix the damage or crack of the concrete material.

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