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Friday, April 24, 2020 | History

2 edition of Autogenous healing of concrete. found in the catalog.

Autogenous healing of concrete.

Magdi Z. Ibrahim

Autogenous healing of concrete.

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Published by North East London Polytechnic in London .
Written in English

Edition Notes

Thesis (B.Sc. Civil Engineering) - North East London Polytechnic, 1983.

ContributionsNorth East London Polytechnic.
The Physical Object
Paginationvi, 22 leaves :
Number of Pages22
ID Numbers
Open LibraryOL13834427M

An autonomou self-healing techniq its inspirat fr t huma body. V self-healing r network t the concr Th tub contain th healing agent. occur micr ev to v br agent micr gra or capillar ces. vascular network ca contai a single heal agent in tub o th can contain multip types of healing agen delivered through sev . @article{osti_, title = {Autogenous healing of sea-water exposed mortar: Quantification through a simple and rapid permeability test}, author = {Palin, D., E-mail: @ and Jonkers, H. M. and Wiktor, V.}, abstractNote = {Concrete has an autogenous ability to heal cracks potentially contributing to its functional water tightness and durability.

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Autogenous healing of concrete. by Magdi Z. Ibrahim Download PDF EPUB FB2

Autogenous healing. Autogenous healing is the natural process of crack repair that can occur in concrete in the presence of moisture, and the absence of tensile stress.

The repair is by a combination of mechanical blocking by particles carried into the crack with the water and the deposition of calcium carbonate from the cementitious material. Autogenous healing Concrete properties such as strength, durability, versatility and economy are well known to engineers, designers, inspectors and contractors.

These qualities are enhanced due to the type of mixes used in concrete pipes. However, one of the most important properties of concrete, and in particular, concrete pipe, is often File Size: KB. The autogenous healing of cement and concrete: its relation to vibrated concrete and cracked concrete, Proceedings of International Association for Testing Materials.

Self-healing capacity of concrete--computer simulation study of unhydrated cement structure. autogenous healing, demonstrating that concrete pipe, in the presence of moisture, can and will heal itself.

Another example was where a foot reinforced concrete bridge had a load of tons applied to the three month old structure and distinct diagonal tension cracks formed in both ends of the Size: 14KB. Due to the autogenous healing, the water flow through the cracks gradually reduces with time, and in extreme cases, the cracks seal completely.

In the past, there has been no deliberate technical exploitation of self-healing because too little is known about the phenomenon itself and about the chemical/physical processes by: Autogenous healing is the natural process of crack repair that can occur in concrete in the presence of moisture and absence of tensile stress.

It has practical applications for closing dormant cracks in a moist environment, such as may be found in mass concrete structures and water retaining or watertight structures.

Published: Format. Autogenous healing of concrete occurs when continuity between two sides of a crack is restored without a deliberate external intervention or repair. In most cases, the cracks are narrow and caused by shrinkage extensive enough to induce locally a strain larger than Cited by: Autogenous shrinkage is the uniform reduction of internal moisture due to cement hydration, which is typical of high-strength concrete.

Autogenous shrinkage contributes significantly to concrete cracking when the water–cement (w/c) ratio is less than [3]. The use of concrete with a somewhat higher w/c ratio can mitigate this problem. autogenous healing Autogenous healing is the ability of concrete to repair or heal cracks in the presence of moisture.

For a brittle material, subject to dimensional changes depending on the amount of moisture present, the self-healing property of concrete is crucial to its application in water-retaining structures. Healing of biologically induced cemented sands Authors: B.

Montoya, J. Dejong Source: Géotechnique Letters, Volume 3, Issue 3, 23 Sep (–). Self-healing of cracks in concrete would contribute to a longer service life of concrete structures and would make the material not only more durable but also more sustainable [4–6].

Self-healing is actually an old and well-known phenomenon for concrete as it. Autogenous healing of concrete was reportedly discovered as early as in by the French Academy of Science, and attributed to the transformation of calcium hydroxide (Ca (OH) 2) into calcium.

The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.

International Concrete Abstracts Portal. Title: Autogenous Healing—A Concrete Miracle. Author(s): Adam by: Self-healing concrete can timely heal the cracks in itself through autogenous or autonomous approaches, which can increase the durability and regain strength of concrete.

Healing Mechanism and Clinical Application of Autogenous Tooth Bone Graft Material. By Young-Kyun Kim, Jeong Keun Lee, Kyung-Wook Kim, In-Woong Um and Masaru Murata. Submitted: May 24th Reviewed: September 19th Published: March 27th DOI: /Cited by: The Romans developed the first known autogenous self-healing concrete, creating structures like the Pantheon and Colosseum that have lasted 2, years.

Autogenous self-healing capabilities are intrinsic to the material itself, produced by altering the chemical or biological composition of the concrete mix. The phenomenon of self healing in concrete has been known for many years.

It has been observed that some cracks in old concrete structures are lined with white crystalline material suggesting the ability of concrete to self-seal the cracks with chemical products by itself, perhaps with the aid of rainwater and carbon dioxide in by:   Self-healing can be defined as the ability of a material to repair inner damage without any external intervention.

In the case of concrete, the process can be autogenous, based on optimized mix composition, or autonomous, when using additionally incorporated capsules containing a healing agent and/or bacteria spores.

Under some circumstances it is known that cracks in the concrete surface can repair themselves through reactions with constituents in the water.

This phenomenon has been termed "autogenous healing." The objective of this project was to examine the effects of bulk water chemistry on concrete corrosion and autogenous repair of : Paperback.

It is well known that as concrete hydrates its permeability decreases. Continued hydration, however, is not the only mechanism which causes such reduction. Self-sealing, which is largely attributed to the dissolution and redeposition of hydrates, and autogenous healing of cracks, can also significantly reduce the flow.

This paper reviews the relative effects of self-sealing, autogenous healing Cited by: “If self-healing concrete can minimize cracks, you should get a longer life and a more sustainable structure,” says Andrew Herrmann, a partner at New York City infrastructure transportation consulting firm Hardesty & Hanover.

In Li debuted a precursor concrete. Protective carrier is essential for the self-healing of concrete cracks by microbially induced CaCO 3 precipitation, owing to the harsh conditions in concrete.

In this paper, porous ceramsite particles are used as microbial carrier. Heat treatment and NaOH soaking are first employed to improve the loading content of the ceramsite. The viability of bacterial spores is assessed by urea Cited by: 9.

the effects of autogenous healing upon the leakage of water through cracks in concrete An investigation is reported which shows that autogenous healing reduces the flow of water through cracks in concrete at rates dependent primarily on the initial effective by: Different healing mechanisms are investigated: (1) Concrete has an autogenous healing capacity as unhydrated cement is present in the matrix.

When water contacts the unhydrated cement, further hydration occurs. Furthermore, dissolved CO 2 reacts with Ca 2+ to form CaCO 3 crystals.

These two mechanisms, however, may only heal small cracks. Autogenous healing is a natural process which allows repairs to cracks in concrete can with the aid of moisture and lack of tensile stress.

Useful for closing cracks in moist environments such as water retaining or watertight structures. Document History Superseded by CA 09 Autogenous healing: the self-sealing of fine cracks (CS, ).

Concrete is one of the most widely used materials in the world, but at some point, no matter how it is mixed, it will crack and deteriorate. It was to this problem that microbiologist Hendrik.

The effect of superabsorbent polymers (SAPs) on autogenous crack healing in cementitious materials with early-age cracking was investigated. SAP-containing samples exposed to wet/dry cycles showed better autogenous healing than those only exposed to wet conditions, as determined by water flow and compressive strength recovery tests.

The water flow rates through cracks ( ± 40 µm Author: Geuntae Hong, Chiwon Song, Seongcheol Choi. This book forms the proceedings of a workshop held in Hiroshima in June and derive from the work of a Technical Committee of the Japan Concrete Institute.

Topics include test and prediction methods, the science of autogenous shrinkage, strain and stress, and consequent design concerns. Autogenous shrinkage can be important when in situ concrete is placed over older concrete as in various forms of hybrid construction. Eurocode 2 states that autogenous shrinkage ‘should be considered specifically when new concrete is cast against hardened concrete’ and suggests that the shrinkage strain will be (f ck – 10) x 10 New insights into autogenous self-healing with NMR tests Huang H.1,2*, Ye G.2,3 4and Pel L.

School of Materials Science and Engineering, Southeast University, NanjingChina 2. Faculty of Civil Engineering and Geosciense, Delft University of Technology, Delft CN, the Netherlands 3.

to heal cracks over time (autogenous) and artificial means of crack repair that are man-made inclusions (autonomous). The motivation for such work is to increase the durability of concrete. The natural self-healing ability of concrete, known as autogenous healing, has been understood for around 20 years.

Free Online Library: Autogenous healing of concrete in the drinking water industry.(Brief article, Book review) by "SciTech Book News"; Publishing industry Library and information science Science and technology, general Books Book reviews.

Overgrinding of Portland cement brings excessive shrinkage and poor self-healing ability to concrete. In this paper, through the ultrasonic test and optical micrograph observation, the self-healing properties of concrete prepared by cement with different particle size distributions were studied.

Besides, the effect of carbonation and continued hydration on self-healing of concrete was : Lianwang Yuan, Shuaishuai Chen, Shoude Wang, Yongbo Huang, Qingkuan Yang, Shuai Liu, Jinbang Wang, P. The success of using the autogenous healing method depends on the diameter of the crack induced in the concrete structure.

Additionally, this method can operate independently in different conditions regardless of the crack position.

Correspondingly, lowering the water-cement ratio improves the autogenous healing : Busari Ayobami Adebola, Kupolati Williams Kehinde, Loto Tolulope Roland, Sadiku Rotimi Emmanuel, Jac. Harris, J, Zhou, Y, Calabria-Holley, J & Paine, KAutogenous self-healing of fibre cements.

in RK Dhir, SP Singh, R Bedi & S Goel (eds), UKIERI Concrete Congress: Concrete: The Global Builder: Working together for durable and sustainable infrastructure.

UKIERI Concrete Congress, Concrete: The Global Builder, Jalandhar, India, 5/03/Author: Jack Harris, Yanjun Zhou, Juliana Calabria-Holley, Kevin Paine. Effects of autogenous healing upon the leakage of water through cracks in concrete. Wexham, Slough: Cement and Concrete Association, (OCoLC) Document Type: Book: All Authors / Contributors: C A Clear; Cement and Concrete Association.

Supersedes CA 09 Autogenous healing: the self-sealing of fine cracks (CS, ). Subjects. Materials In situ concrete/cement Publisher History. For more than 30 years, The Concrete Society has been publishing technical reports and advice notes to serve the needs of clients, architects, engineers, specifiers, suppliers, contractors and users of.

RE: Autogenous Healing of cracks in foundation BarryEng (Civil/Environmental) 10 Dec 07 I should have mentioned before - when I said that I had only seen 3 references to autogeneous healing of concrete, I should have said specifically "in relation to the definitive calculations for the autogeneous healing in a concrete tank".

A self-healing material is described as a material that is capable of repairing itself back to the original state. The concept of self-healing concrete (SHC) that happens over time (autogenic) has been observed in many old structures which have re.

Open Library is an open, editable library catalog, building towards a web page for every book ever published. The effects of autogenous healing upon the leakage of water through cracks in concrete by C.

Clear,Cement and Concrete Association edition, in EnglishPages:. 4. Cementitious composites self healing 5. Bio-concrete method of self healing 6. Bacteria based self healing. Autogenous Self-Healing: [Yang et al. ; Jacobsen et al.

; Granger et al. ; Li and Li ] Autogenous self-healing relies on the composition of concrete and is File Size: KB.Autogenous healing is common in underground drainage pipes because of the presence of water on either side of the pipes.

The non-moving cracks in concrete pipes are sealed by calcium carbonate crystals from carbon dioxide in air and calcium hydroxide .Describes the process of autogenous healing, highlighting requirements and water resisting admixtures.

Document History Supersedes CA 09 Autogenous healing: the self-sealing of fine cracks (CS, ). Author Roberts, D. and Barnes, R. (revised) Publisher Information.