concrete slab without control joints

Concrete Slab Without Control Joints

joints in concrete buildings,temperatures, and concrete placing temperature. other control joint details can be found elsewhere4. location the plan shape of the particular pavement will have a marked influence on the joint layout and location as will the anticipated construction technique. generally, for reinforced floor slabs strip placement is preferred; the width of.joint free slabs - concrete slabs on grade without control,joint free slabs is a multi-award winning, patented system for slab on grade pavements constructed using our innovative method of catering for concrete shrinkage. in traditional slabs on grade control joints are installed for this purpose. joint free slabs pty ltd has developed a crack inducer grid that eliminates the need for all control joints..

What Can I Do For You?

I accept the Data Protection Declaration


    joint free slabs™ is an innovative method for the construction of vast areas of slab on grade without the traditional formed and sawn shrinkage control joints. a crack inducer grid is used to induce a closely spaced network of fine cracks throughout the entire area of the slab that do not need to be reflected through applied floor finishes. the joint free slab system is a very appropriate system for retail centres

  • slab on grade without control joints? - Structural

    Slab On Grade Without Control Joints? - Structural

    i believe the theory is if you use 0.5% reinforcing you don't need any control joints, no matter how large or long the concrete slab area. of course, concrete has a mind of its own daveatkins

  • Concrete slabs and control joints - BRANZ Build

    Concrete Slabs And Control Joints - BRANZ Build

    be laid across the free joint or shrinkage control joints, as any movement in the slab is very likely to cause cracking or damage to the flooring. instead, create movement control joints in the tiling or other flooring to coincide with the shrinkage control joints in the concrete slab. referenced standards

  • Concrete poured and no control joints cut - too late now

    Concrete Poured And No Control Joints Cut - Too Late Now

    concrete continues to cure over months and continues to shrink over that time also. control joints do not stop cracks but try to give the concrete a weak place to crack in somewhat of a straight line instead on a crooked line. there is no guarantee that concrete will crack in the control joints but a greater chance it will crack there.

  • Control Joints in Structural Slabs?| Concrete Construction

    Control Joints In Structural Slabs?| Concrete Construction

    slabs on grade require control joints to permit horizontal movement (shrinkage) without random cracking. control joints are permissible because of the subgrade support. on structural slabs it is necessary for the concrete to be continuous between supports,

  • Concrete Control Joints - How To Minimize Cracking In

    Concrete Control Joints - How To Minimize Cracking In

    in concrete slabs and floors there are three types of control joints: 1. concrete expansion joints also referred to as concrete isolation joints. 2. concrete contraction joints. 3. concrete construction joints. read about each one to learn how they are used to help control random cracking in concrete slabs, floors, sidewalks, pool decks and driveways.

  • How Often Do You Need Expansion Joints in Concrete

    How Often Do You Need Expansion Joints In Concrete

    expansion joints are full-width cuts installed in professional concrete floors and walls that allow the concrete to expand and contract without cracking randomly. they isolate different parts of the slab so that the whole slab can move without straining certain parts more than others.

  • Concrete Joints - Types & Purpose of Joints in Concrete

    Concrete Joints - Types & Purpose Of Joints In Concrete

    dowels must be smooth, with no sharp edges that can catch in the concrete. rebars do not make good dowels. one half of the dowel, within the concrete on one side or the other, must not be bonded to the concrete to allow the joint to open as the concrete shrinks. debonding agents or grease are commonly used. don't apply the grease too thickly.

  • Control Joints - Expansion Joints -- Movement Joints

    Control Joints - Expansion Joints -- Movement Joints

    any restraint which will concentrate drying stress forces is capable of producing cracks in the restrained member, unless control joints are utilized. adequately designed control joints properly placed will relieve this restraint. many factors contribute to the drying shrinkage coefficient of concrete.

  • Conctete slab crack control joint FAQs

    Conctete Slab Crack Control Joint FAQs

    interestingly in some situations, a seven delay between placement of a new concrete slab and cutting-in of control joints is actually necessary in some cases to permit proper cuts without damaging the slab. research citations on delay in cutting control joints in concrete

  • Basement slab without expansion joints - Structural

    Basement Slab Without Expansion Joints - Structural

    on a rectangular slab try to cut the slab in equally spaced joints trying to make each section as square as possible not to exceed 20 feet. on an irregular shape foundation you have to be creative to ensure each section can shrink without restriction form any foundation offset.

  • Types of Concrete Joints and Placing Tips

    Types Of Concrete Joints And Placing Tips

    maximum joint spacing should be 24 to 36 times the thickness of the slab. joints should be spaced about 10 feet and a maximum of 15 feet. when using joint groove for contraction joints, the joint should be a minimum depth of ¼ thickness of the slab. saw-cut joints should be done within 4 to 12 hours after the concrete has been finished.

  • How To Reinforce Concrete Slab on Ground to Control

    How To Reinforce Concrete Slab On Ground To Control

    in general, there are two options for controlling cracks in slabs-on-ground: 1) control the location of cracking by installing contraction joints (does not control crack widths) or 2) control crack...

  • Control Joint vs. Expansion Joint Difference - Concrete

    Control Joint Vs. Expansion Joint Difference - Concrete

    control joints form a convenient point at which to stop concrete work at the end of the day. control joints should never be formed in the middle of a bay. control joint is placed at the location of highest concentration of tensile stresses resulting from shrinkage are expected: at abrupt changes of cross-section; and; in long walls, slabs.

  • Concrete Control Joints 101: How to Apply Filler | For

    Concrete Control Joints 101: How To Apply Filler | For

    finally, project owners need to consider the cost of filling their control joints for new construction. on average, filling control joints costs approximately $2.00 per linear foot

  • STRUCTURE magazine | Avoiding Problematic Uses of Slabs on

    STRUCTURE Magazine | Avoiding Problematic Uses Of Slabs On

    neither elevated slabs nor concrete mats – the elements closest to structural slabs – use control joints where the reinforcement stops. however, an sog without isolation and control joints or where the deformed reinforcement continues through the joints (as in a structural slab) ( figure 2 ) is vulnerable to random cracking, as explained in aci 360r section 6.2.

  • Concrete Slab Surface Defects: Causes, Prevention, Repair

    Concrete Slab Surface Defects: Causes, Prevention, Repair

    control the location of cracks, joints are placed at regular intervals. experience has shown that contraction joints (induced cracks) should be spaced at about 3-m (10-ft) intervals in each direction in 100-mm-thick (4-in.) unreinforced concrete slabs on grade and at about 6-m (20-ft) intervals in 200-mm-thick (8-in.) slabs. figure 2.

  • Curing Concrete Dos and Don'ts - Bob Vila

    Curing Concrete Dos And Don'ts - Bob Vila

    don’t skip control joints in concrete slabs. the goal of all concrete installation is to produce a high-quality product that resists cracking.

  • control joints on monolithic slab foundation - Concrete

    Control Joints On Monolithic Slab Foundation - Concrete

    for light use such as sidewalks, residential slabs, and driveways, you don't need wire mesh. use plastic fiber in the concrete and, most importantly, cut your control joints as ron says, no more than 12 feet apart. some will disagree with me on the benefits of plastic fiber, but the control joint placement and timing is critical.

  • Part One: What Causes Concrete Cracks & How Do I Minimize

    Part One: What Causes Concrete Cracks & How Do I Minimize

    for exterior work on a 4-inch-thick slab, the length and width of the new concrete slab should not exceed 8 to 12 feet in any direction without placement of control joints. when cracking occurs. if you already have cracked concrete, sakrete® offers the following products for existing crack repairs:

  • Are Sawcuts Required in My Slab? Part 1 - Commercial Slabs

    Are Sawcuts Required In My Slab? Part 1 - Commercial Slabs

    in aci 360 section 6.1.3 – sawcut contraction joints, the term “unreinforced” refers to both plain concrete and concrete reinforced for crack control only (i.e. not for flexural strength). the percent of steel reinforcing that applies to crack control only (and considered “unreinforced” for the purpose of this section of the code) is less than or equal to 0.5% of the gross cross-section of the slab.

  • ACI 224.3R-95 Joints in Concrete Construction

    ACI 224.3R-95 Joints In Concrete Construction

    however, improperly detailed and constructed “control” joints may not function properly, and the concrete can crack adjacent to the presumed joint. in many cases a “control joint” is really nothing more than rustication. these joints are really trying to control cracking due to shrinkage and thermal contraction.

  • How to Cut Control Joints in Concrete - Mastercut Concrete

    How To Cut Control Joints In Concrete - Mastercut Concrete

    the easiest way to remember the difference is that control joints aim to manage cracks and expansion joints aim to reduce cracks in concrete. 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.

  • Why Do Concrete Slabs Crack | Sakrete

    Why Do Concrete Slabs Crack | Sakrete

    control joints are basically an acknowledgment that concrete will crack. the control joints can help to eliminate cracks or in a worse case scenario channel where the cracks will appear. have you ever notice how your sidewalk or driveway has either dividers essentially making several slabs out of one big slab or it has cuts running through it every 3 or 4 feet?

Recommended news