When a structural movement joint is already provided in the base, a movement joint in the bedded finish must be positioned immediately above. Preformed movement joints are sometimes installed to less than full depth of the bedding or else over narrow trowelled cuts and grooves in the sand-cement mortar. A bead of stiff dense cement grout has flowed into the trowel-cut groove under the Latham joint. Such co-incidence of butt-joints is easily avoided. Assuming that the paving materials are installed at an average temperature of 25 degrees Celsius on a site subject to groundwater freezing in winter, contraction from the initial condition will account for 0. Try our product selection assistant. 
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Inconsistent load-bearing and shrinkage characteristics of sand-cement beddings that are tapered to achieve drainage falls in floors and pavements. Shipbuilding and marine structures Would you like to know more? However this combination of thermal and moisture strain is not likely to occur outside a testing laboratory, for it assumes tilework or stonework saturated while at its maximum service temperature.
These are best expressed in millimetres per metre per degree Celsius temperature change.
Expansion Joint Design Criteria
Anchors should be located near the ends of every strip. When a structural movement joint is already provided in the base, a movement joint in the bedded finish must be positioned immediately above. It is divided into a section for general terms and a section for terms specific to window glazing.
These notes have been prepared as a general guide for specification and detailing of Latham Neoprene-X-Pansion Loc Strip Control Joints in ceramic tile, natural stone and reconstituted stone floors and pavements. Movement across the structural joint must not exceed that anticipated in the flooring design, and it must be limited in one direction. The Australian Standard defines these joints as: Expansion Joint Design Criteria.
One solution to the problem of straight joints through irregular surfaces is to incorporate bands of relatively smooth stone along movement joints. However these limiting values rarely occur in properly detailed and well-installed floor systems, for commonly recommended maximum bay sizes are safely conservative. Jess Mclivain, a consultant to the Tile Council of Americaadvises that: Construction materials and building Movement joint strips of less than millimetres, i.
Mechanical behaviour — UNITRACC - Underground Infrastructure Training and Competence Center
PDF - Immediate download - Both preformed metal-neoprene and site-applied elastomeric sealant joints ultimately resist point loads and rolling loads through joint-to-tile adhesion or joint-to-bedding anchorage. Penetrations, discontinuities and rigid attachments in floors and pavements, such as downpipes, balustrades, bollards, light stanchions, steps, escalator landing, manhole covers, fixed outdoor furniture, planter boxes, free-standing directory boards and so on, which may concentrate and restrain the normal distribution of movement stresses.
Audio and video engineering Most hard flooring and substrate materials above the structural base are able to accommodate normal levels of strain. Plastic joint sealing masses are not suitable for sealing joints subject to constant movement Image 5. Alternative cleaning methods should be employed.
Eventually a cleavage plane develops and spreads from the base of the inserted joint through the mortar, in turn leading to drumminess, fracture, water saturation of the bedding and concentrations of efflorescence. Use the form below to get in touch and one of our consultants will get back to you as soon as possible. Latham Loc Strips and conventional site-applied elastomeric sealant joints can accommodate movement in the horizontal plane across the line of the joint, but they are not intended to resist differential movement along the joint or in the vertical plane.
Latham Australia Pty Ltd recommends the use of 12mm wide preformed joints for external terrazzo pavement.
Such co-incidence of butt-joints is easily avoided. Changing loading of joint sealing masses and their effects [Stein82a] [Holza74].
Tiles exposed to sunlight continue to lose heat by radiating energy fin, by convection over the exposed surface and by conduction into relatively massive substrates. If a reversible moisture expansion of 0. Control of interaction between structure 524660 flooring materials requires co-ordination with the engineer to locate movement joints in the bed and tiling immediately above and continuous with structural movement joints in the base.
Architects and interior designers continually seek to employ new forms and materials and to use familiar materials in innovative combinations.
The designer must therefore take care to limit and accommodate uniformly the induced stresses within each bay as well as to ensure tolerable and consistent deformation of movement joints. NS The number of pages:
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