Advantages And Disadvantages Of Honeycombs

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Honeycombs are a common problem in Engineering especially in the construction industry. It refers to the voids left in concrete that causes cavities and hallow pockets among aggregate particles (Ismail, Z. & Ong Z.C., 2012). Honeycombs are due to non-reaching of concrete to all places from improper vibration of concrete during pouring, the use of very stiff concrete and the jumbling of reinforcements in one place (Earley, B., 2008). The author of the Contractor and Assessment Repair of Concrete Structures discussed techniques and methods on how to repair honeycombs. It can be repaired through epoxy injection, carbon-fiber reinforcing or stitching (Banville, M.H., 2008). From all the proposed solution, epoxy injection is generally used as it…show more content…
The process of injecting Epoxy into the cracks is quite simple. The epoxy flows right up to the outer surface of the crack/honeycomb upon injecting. All parts of damage are injected and the epoxy is left to cure. It takes an average of seven days for epoxies to cure and completely harden (Earley, B., 2008). Epoxy usually has a compressive strength of 12,000 psi or greater which exceeds most of concrete strength (Banville, M.H., 2008). That's why epoxy is a great material for repairs of honeycombs. However, this kind of material cures very slow that it takes hours/days to harden. The slow curing process of epoxy can be an advantage because it allows time for the epoxy to flow through between its pockets. On the other hand, without proper caution the epoxy may flow out at the backside of the crack. This will cause improper repair and may cause severe damage on the…show more content…
Epoxy injections are readily available in the market and range different kinds of viscosities from flowly to paste-like grouts. This range is to accommodate different crack widths. It is recommended to use whatever viscosity is needed to inject a given crack. The wider the crack, the thicker the material required. Also, a few companies still use epoxy as a waterproofing component because it forms a strong bond with the concrete. Companies like Hilti and Emecole are one of the accredited companies to produce epoxy. In making the epoxy, one must consider that it should meet the standard set by American Society for Testing and Materials (ASTM). For testing the epoxies, ASTM C109/109M or the standard specification for epoxy resin base bonding systems for concrete is

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