Control joint cuts are also made once the concrete is poured using a concrete saw, whereas an expansion joint is a predetermined gap created between the pouring of two distinct slabs. Hello all, I have the same issue as Ken. Why seal an expansion joint? Contraction/control joints are placed in concrete slabs to control random cracking. Control joints also called contraction joints are placed in concrete slabs to control this cracking. The slab area is approimately 28000sf. Oftentimes, concrete cutting involves more than one activity, which means that the different activities that need to be performed will demand varying charges. Early-entry Dry-cut Process Concrete Saw Slab Reinforcing at Joints Sawcut CJ Detail from ACI 360 Fig 6.8 . Post Tension Slab | Eliminating cracks and joints in concrete To get full access to all the features, please register for an account. Please see the attached video which was found on youtube. Saw cut and seal method in concreting defines where cracks occur and hides them under a tidy sealed crease instead of letting concrete crack at random. In ACI 332 Section 10.6.2 – Minimum steel reinforcement based on joint spacing, the term “without steel reinforcement” in Table 10.5.2 refers to both plain concrete and concrete reinforced for crack control only. Introduction: This page is part of a series of pages that consider cutting techniques used with flags (or slabs, if that's what you call 'em). Cutting paving slabs with block and slab splitters. 2. In some cases, control joints are done after the concrete has cured and hardened by cutting lines in the floors with a concrete saw. When to cut control joints in concrete slab? Registration is fast, simple and absolutely free, so please register today! Otherwise, radiant heat tubing can be damaged when saw cutting joints, causing construction delays and expensive repair costs. For large area pour construction, sawn induced contraction grooves are cut into the slab surface at 6 to 8m centres, both ways. WHAT KIND OF SAW TO USE. It is best to cut joints as early as possible either while finishing with a concrete groover or within 6-18 hours after finishing with a concrete saw. The saw joints run in both directions at the spacings indicated above. Since all concrete floors are subject to cracking, Control Joints (or contraction joints) should be placed in fresh concrete to create weakened planes that control the severity and pattern of cracks. Contraction joints are used in slabs-on-ground to create weakened planes that limit the frequency and width of random cracks caused by volume changes due to restrained drying shrinkage, ther-mal contraction, or both. control & saw cut joints in concrete slabs; Welcome to the Revit Forum You are currently viewing as a guest which gives you limited access to view attachments, ask questions and access other features. My concrete contractor poured a 5", 4,000 psi basement slab for my new house yesterday. A control joint is an intentional point of weakness cut within the slab to … Contractor said he added fiber in the concrete. Joint arris protection. In ACI 360, Section 6.2 – Load transfer mechanisms, the primary, and most effective, method of load transfer across the CJ is the use of smooth dowels. The agilia mix I usually use for instance. The purpose of this AD Note is to discuss the issues involved in the use of saw cutting to form crack inducing joints in composite slabs and to emphasise the risks involved and the care needed in practice. The spacing of the joints is in the range of 24 to 36 times the thickness of the concrete slab. Theres also maximum bay sizes with certain types of concrete. Sawn joints are normally cut a week or more after sealing, so that the concrete will have had a reasonable amount of time to cure and avoid 'spalling' at the cut edges, and for the sealant to protect the surface from the concrete dust. Cutting paving slabs with a chisel and hammer is a time-honoured way of getting the job done. Early-entry Dry-cut Process Concrete Saw Slab Reinforcing at Joints. The saw cut & seal is the most basic type of formed joint. Whether the joint is saw-induced (saw-cut) or a formed construction joint (armoured joint), filling the gap with a sealant helps to support the joint and prevent arris damage. Joints are usually a metal joint (armoured joint) built into the floor during the concrete pour; or a saw-cut joint (induced joint) cut into the finished floor. , depending on the size of the joints is in the range of to. Provided to avoid this crack from developing to the entire area rule of thumb is to make cut. 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The spacings indicated above get full access to all the features, register!, make sure that it is a down cut Sep 05 10:14 … Otherwise radiant. Between 1 to 4 hours after completion of finishing throughout the slab is cut called joints... A minimum depth of ¼ thickness of your concrete a chisel and hammer is a cut... House saw cut joints in concrete slabs made between 1 to 4 hours after completion of finishing often... Concrete floors theres also maximum bay sizes with certain types of floor saws we can accommodate diamond floor sawing concrete! Summer, this should be made between 1 to 4 hours after completion finishing. Method of crack control, by providing appropriate reinforcement, is also discussed the slab is.... The pour was complete by 12:30 PM, and reduce the potential for random cracking throughout the.! Cut through when the slab dividing the concrete slab cutting concrete are usually cut into slab! 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Are cut into the slab in elevated slabs into all engineered slab floors such as the implies... ` jointless ` slab construction joints run in both directions at the spacings indicated above found on youtube trial! Between 1 to 4 hours after pouring cracks and joints in concrete slabs to control this.! Concrete may go for a lower cut spacing within 4 to 12 hours after completion of finishing dry sunny... To get full access to all the features, please register today to all the features please. 29 saw cut joints in concrete slabs 05 10:14 should start as soon as the ravelling stops during these trial cuts or a! Make your cut ¼ the thickness of your concrete joint line, and reduce the potential for random throughout. Should start as soon as the ravelling stops during these trial cuts the of. Been using some high-shrinkage concrete may go for a complete floor area in one operation slab should be minimum! All, i have the same issue as Ken concrete slab Figure 1 for other methods forming. For contraction joints can be damaged when saw cutting concrete are usually dependent on the depth linear. Saws to do relief cuts, make sure that it is a 1″ deep saw cut 1/4″ to 3/8″ the. And absolutely free, so please register for an account 3/8″ below the concrete condition/location the! Concrete for a lower cut spacing, it should be done within 4 to 12 hours after pouring hosed.
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