I had a house built with a double drive, and 4 inches of concrete poured over Mesh/wire. All concrete will shrink slightly as it dries and, when it’s set, will expand or contract depending on the ambient temperature. They use a high-quality, self-leveling caulk that won't shrink and is flexible enough that it will remain in place even if the concrete does happen to shift around. Expansion joints separate the slab from structures such as foundation walls, footings, and structural support columns, and allow the slab to move unrestrained both horizontally and vertically.These joints can be strips of asphalt-impregnated sheeting, compressible foam, or other materials that are put in place before the slab is poured. Joints allow one concrete element to move independently of other parts of the building or structure. 2. However, this also means tensile pressure is put through the concrete as it shrinks, which can cause cracks. Ideally, for expansion joints on the exterior of a st… Long stretches of concrete do not require intermediate expansion joints. The tear-off strip on top of Abelflex is there for a reason that is often overlooked. The pre-planned cracks will provide a better finish concrete product and will be formed in specific locations where those cracks could be monitored. The material should extend the depth of the slab and extend the full width of the slab. They are also installed to absorb vibration, hold parts together or allow those parts to move as the ground settles or if there is an earthquake. Laying a concrete driveway is a typical project often requiring the use of expansions joints, depending on the size of the area to be covered. When to use an expansion joint, how many and what expansion joint type to use is determined by the piping layout and the operating parameters.Also the connected equipment is determining when to use an expansion joint. Joints shall be spaced at 24 to 36 times the slab thickness but this need to be confirmed by a structural engineer. Concrete, like many other materials, expands when heated and shrinks when cooled. For more information about Hanson concrete or to request a quote, please use the contact details on this page. Also, if placed against inflexible materials, concrete has nowhere to go when or if it expands due to heat and moisture, again potentially damaging the concrete. Expansion joints are usually a complete 'gap' between adjacent bays, ie, there is a definite break in the concrete and any reinforcing steel that may be present. Movement joints are also useful when laying concrete within an area bounded by walls or buildings, or when an object such as a manhole cover has to be incorporated within the slab, as they allow the concrete to expand and/or contract without transferring pressure onto the other structures, causing cracks within the concrete slab, or the wall, MH cover, etc. When to Saw-Cut Concrete . Asphalt Expansion Joints: Asphalt is the most commonly used expansion joint material used in concrete flatwork. Expansion joints in concrete pavement are also seldom needed, since the contraction joints open enough (from drying shrinkage) to account for temperature expansion. All rights reserved. Some examples of such stationary structures are: a house, a building or deck posts. I made a short video to show you how to caulk a concrete expansion joint. If you need to add an expansion joint to a driveway after it has been poured and has cured, you can use a cement saw to cut the joint. An expansion joint that can add flexibility and buffer the movement in the concrete is therefore the best solution. A light hose down keeps it bright and clean. AS important is the basis of what you use to reinforce and support the pouring. A concrete expansion joint – or control joint – is a gap which allows the concrete to expand and contract as/when the temperature changes. A tiled surface is similar to a sheet of glass in its rigid nature, and this can cause problems when there is movement. An expansion joint is a material placed in the cracks (or joints) between concrete slabs to protect the slabs from cracking when they contract and expand as the temperature changes. If the expansion joint is being used externally (which is likely), ensure the joint sealant is suitable for external use. Check out the interactive illustration of some applications and products. DECK-O-JOINT will not whip or warp during application. Concrete, like many other materials, expands when heated and shrinks when cooled. Use a scraping tool, like a 5-in-1, to scrape out the old concrete expansion joint filler. It is composed of cellular fibers securely bonded together and uniformly saturated with asphalt to assure longevity. Internal restraint is created when one part of a slab shrinks more than another, or shrinks in a different direction. Before pouring the concrete it is important to make sure the fibreboard strips are the same height as the depth of the concrete to be poured. There are two types of expansion joint filler , foam and fibreboard. Joint spacing normally ranges between 10 to 18 feet depending on the amount of reinforcement the slab has. © 2020 Growtivation. Gather all your old socks and a few worn out T-shirts. The technical term structural engineers use for the gap made by Abelflex is an Isolation Joint. One thing that I was taught in my years as a concrete finisher is that there are two things in life that are certain, the first is of course death and the second is concrete is going to crack. Figure 1a: Joint Spacing in Meters. Saw-cut contraction joints are ideal for decorative concrete because the joint is narrower and cleaner than a tooled joint. Use A Concrete Saw. An expansion joint is simply a disconnection between segments of the same materials. Sakrete Concrete Fiber Expansion Joint is a multipurpose expansion contractor joint filler. Expansion joints are provided in slabs, pavements, buildings, bridges, sidewalks, railway tracks, piping systems, ships, and other structures. Concrete expansion joints in roads and bridges are created in asphalt or concrete to allow material expansions and contractions due to the changes in temperatures, or due to road or bridge movement. For a 100mm slab, cut the joints at least 25mm deep. Installing expansion joints and using a high-quality silicone-based sealant is one important step you can take to ensure that your work will last for years to come. Concrete Joint Sealant Preparation. It stands up well to petroleum spills and harsh cleaning products. Joints are most effective when the aspect ratio of the slab is kept to 1:1, for example 5m x 5m if the slab is a narrower than it is long it is possible to increase this to a maximum aspect ratio of 1.5 for example 2m x 3m, don’t leave the placing of concrete expansion joints to chance and enlist the services of a structural engineer if several are required. If you need to add an expansion joint to a driveway after it has been poured and has cured, you can use a cement saw to cut the joint. It's not that hard to do, you just have to be careful when you use a self-leveling caulking material, once you start the flow of the caulking it doesn't stop the instant you stop squeezing the lever. Improperly sealed expansion joints can sometimes be to blame, which is why it is so important to use a proper expansion joint filler for concrete when doing repairs. I want to take the concrete right up to both. Expansion joints are used to allow the slab to move and not put stress on whatever it abuts. Will the lack of an expansion joint hamper or destroy the function of the facility, or cause damage to the structural or architectural compo-nents? Why Joints Need Quality Sealant. The rugged life of a control joint As we know, control joints (more properly, according to the American Concrete Institute , contraction joints) are essentially planned cracks that allow for movements caused by temperature and moisture changes (drying shrinkage). Road expansion joints are normally sealed with hot tar, cold sealant, or compression sealants. Expansion joints are the V-shaped grooves that are typically cut at every 5-10 meters at a depth of 5 mm and 5 mm wide. 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