Honeycombing Concrete Method statements repair solutions. Honeycombing is caused by the mortar mixture not filling the space between the coarse aggregate particles. It is one of major reason for strength reductioconcrete production/cohesivenessn of concrete members. know more about Prevent Honeycombing In Concrete.
honeycomb often contains loose coarse aggregate if the void is caused by a leak in the form. If the void is caused by poor concrete consolidation; the coarse aggregates often are intact. Mainly its occurs by improper vibration during concrete, Failures at junctions beam and columns. jumbling of reinforcement of beams and column rods at one place. special attention is required at such place during concreting and vibrating. Honeycomb reduce strength. And provide passage for water that corrodes the reinforcement. High concrete free fall while pouring and Improper placement of bars at column and beam junction.
HoneyComb Void Space Gap Fill Concrete Methods
Steel congestion not allowing concrete flow to all corners available. It is suitable for wide range of industrial environments such as warehouses, loading bays, bridge deck, car parks and ramps.Honeycombing complications for concreting works is a simple problem that can be avoided if the proper concreting methodology is followed. Concreting engineers have to strictly follow and use equipment such as vibrators during the actual concrete casting. To reveal the actual depth of honeycomb because that’s how a quality engineer decides what type of material would be used pertaining to its required thickness.
Mix similar materials with the original member from the color to strength to promote homogeneous member. It may be caused by insufficient fine material in the mix, perhaps due to incorrect aggregate grading or poor mixing. This can be corrected by increasing the sand and cement content of the mix and by proper mixing, placing and compaction.
Concrete contracts and expands with changes in moisture content and temperature, and it deflects depending on load and support conditions. There are many different forms of cracks in concrete to deal with on a daily basis. Poor cover over reinforcement leads to carbonation and chloride attack. When ignored, this too can lead to more serious problems with corrosion.
Cracking can also result from others causes:
• Improper joint spacing;
• Poorly prepared subgrade;
• Structural overload;
• Disruption from expansive aggregate
• Disruption from corrosion of reinforcement.
Honeycombs and voids in concrete are created when the mortar does not fill all of the spaces between the coarse aggregate particles. This is occurring more frequently because of the changes in structural design and the need to change the concrete mixture design to suit the requirements of the specifications.
Repairing Honeycombs Voids
Repairing Honeycombs/Voids is designed with horizontal repairs in mind, it is also suitable for voids in a vertical application dealing with honeycombs or voids. Voids often occur because aggregate is too large to pass through a condensed area of reinforcement. When forms are removed, large areas without concrete need to be filled.
Side Effects of Honey Combing, Negative sides. Honey combing makes concrete weak.
It provides easy entry of moisture in RCC Constructed structure. Reduce structural strength of concrete Components and It leads to open out reinforcement to the atmosphere, which may to corrosion problem in future. Concrete should be thoroughly compacted and fully worked around the reinforcement, around embedded fixtures and into corners of the formwork. Concrete should retain Slump before it is placed. Apart from initial slump, concrete should be designed to retain slump till the time it is placed. Reinforced concrete structures have failed within 20 or 30 years of their construction due to honeycombs, which is less than half their projected life. Honeycombs as a defect not only reduces the load bearing capacity but water finds an easy way to reinforcement rods and rusting and corrosion starts.
Reasons For Honeycombing
The main reason for honeycomb problems is improperly compacted concrete.
concrete vibrators are not overused as this would cause a complete separation of coarse aggregate to cement.
Light and cement aggregate may settle beneath the ground line leaving the coarse aggregates in the middle portion of the structure.
The various reasons for honeycomb in concrete are as following:
Inappropriate workability of concrete.
Use of stiff concrete mix or the concrete is already set before placing.
Improper vibration of concrete in formwork.
Use of larger size aggregates in excessive amount.
Formwork is not rigid and watertight.
Concrete is poured from more than allowable height.
Congestion of steel is preventing the concrete to flow over all corners.
Prevention of Honeycomb in concrete. Take care that concrete section shape and its reinforcement will allow the concrete to flow around the reinforcement and completely fill the forms. Ensure that the concrete mix has proper cement mortar gel to fill the voids between the coarse aggregate.
How to Repair Honeycomb in Concrete Surface here provided Step By Step Procedure To Repair Honeycombed Concrete Surface. Honeycomb seen on concrete structure prepares by wire brush, hammering,etc., to produce a clean, aggregate exposed finish, free from contaminants. Any expose steel to completely uncover. Remove all rust scale or corrosion products. This makes using compact mix with cement to a required amount as per the size of honeycomb.