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      CRACK HEALING IN CEMENTITIOUS MATERIALS INCLUDING TESTS METHODS

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          Abstract

          If concrete is crack free, deleterious substances can be avoided entering the body of the material, that may corrode the rebar or encourage freeze/thaw damage. This paper examines a self healing system of cementitious materials.

          Microbial induced calcite precipitation was used to heal cracks in concrete with calcite using bacillus bacteria in alkaline conditions to generate a calcite filling material.

          Self healing of cracked prisms was determined using a water flow and absorption test and the results were expressed to record the healing as a percentage.

          The findings of the tests showed that a significant degree of self healing had taken place after 56 days after inducing a crack to the concrete prisms and the water flow test was appropriate to determine the degree of self healing taking place.

          Limitations of this process are such that the process requires a biological laboratory to create the spore impregnated aggregate. Once the aggregate is prepared, the batching process is essentially the same as any normal concrete.

          A practical use of this system could be developed using cover panels of self healing material to act as permanent formwork, thus placing the healing ingredients where they are needed at a minimum cost. The system has huge potential for the creation of a self repairing sustainable infrastructure.

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          Most cited references 16

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          Quantification of crack-healing in novel bacteria-based self-healing concrete

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            Self-healing polymer composites: mimicking nature to enhance performance.

            Autonomic self-healing materials, where initiation of repair is integral to the material, are being developed for engineering applications. This bio-inspired concept offers the designer an ability to incorporate secondary functional materials capable of counteracting service degradation whilst still achieving the primary, usually structural, requirement. Most materials in nature are themselves self-healing composite materials. This paper reviews the various self-healing technologies currently being developed for fibre reinforced polymeric composite materials, most of which are bioinspired, inspired by observation of nature. The most recent self-healing work has attempted to mimic natural healing through the study of mammalian blood clotting and the design of vascular networks found in biological systems. A perspective on current and future self-healing approaches using this biomimetic technique is offered. The intention is to stimulate debate outside the engineering community and reinforce the importance of a multidisciplinary approach in this exciting field.
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              A review: Self-healing in cementitious materials and engineered cementitious composite as a self-healing material

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                Author and article information

                Journal
                jgrb
                Journal of Green Building
                College Publishing
                1552-6100
                1943-4618
                1943-4618
                Winter 2020
                : 15
                : 1
                : 37-54
                Author notes

                1. Engineering and Environment, Northumbria University, UK, arichardson@ 123456northumbria.ac.uk

                2. Engineering and Environment, Northumbria University, UK

                3. School of Mathematics Department, UEA ,UK

                4. Engineering and Environment, Northumbria University, UK

                5. Engineering and Environment, Northumbria University, UK

                Article
                jgb.15.1.37
                10.3992/1943-4618.15.1.37
                ©2020 by College Publishing. All rights reserved.
                Page count
                Pages: 18
                Product
                Categories
                RESEARCH ARTICLES

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