Common use of Construction Joints Clause in Contracts

Construction Joints. All contraction joints shall be straight, truly vertical or level, as the cast may be, of the profile shown and formed in the exact positions shown on drawings or if not shown on the drawings, with prior approval of the Engineer. Vertical joints shall be formed against adequately secured rigid stop boards having splayed fillets, designed to pass the continuous steel reinforcement without temporary bending or displacement. The rate and method of placing concrete and the arrangement of constructions joints shall be placed in a continuous operation. Joints in reinforced slabs, joists and beams, shall be perpendicular to the axis or surface of the member jointed and at the center of the span. If an intersecting member occurs at that point, the joint shall be located at a point of minimum shear. Construction joints in columns shall be as shown on the drawings. Whenever it becomes necessary to stop work, such stops shall be located at center of slabs and of beams or as directed by the Engineer. An adequate and acceptable key for succeeding work shall be formed by using stop boards which shall be constructed tightly to prevent any grout leak. As early as possible boards shall be removed and the surface thoroughly hacked and brushed to remove all laitance. Any leakage past stop boards shall be hacked off as soon as the concrete has set. The surface shall be left clean and dry. Immediately prior to further concreting the joint face shall be soaked with water and covered with sand cement mortar of proportions identical to that in the concrete to be placed, punned into the body of the set concrete. For exposed finishes, care shall be exercised to preserve an unbroken line at the exposed edge of the joint. In no circumstances shall the concrete be allowed to finish at a break running down a rough slope. Such cases, if found, will be treated as contrary to the specification and the Contractor will be required to cut out the member and re- cast. In the case of horizontal joints, any excess water and laitance shall be removed from the surface after the concrete is deposited and before it has set. Before casting slabs the haunching or seating for the slab shall be thoroughly hacked, sourced and washed and covered with at least 5 mm of mortar immediately before the slab is cast. Any necessary construction joints in foundations shall be stepped and lapped 600 mm. Joint faces shall be prepared and treated as described, above Specification Concrete Work

Construction Joints. When the work is to be interrupted, the concrete shall be rebated at the joint to such shape and size as may be required by the Engineer or as shown on the drawing. All contraction vertical construction joints shall be straightmade with step boards, truly vertical or level, as which are rigidly fixed and slotted to allow for the cast may be, passage of the profile shown and formed reinforcing steel. If desired by the Engineer keys and/or dowel bars shall be provided at the construction joints. In the case of water retaining structure water stops of approved material shall be provided if so specified in the exact positions shown on drawings or if not shown on the drawings, with prior approval of desired by the Engineer. Vertical Construction joints shall be formed against adequately secured rigid stop boards having splayed filletsprovided in positions as described, designed to pass the continuous steel reinforcement without temporary bending or displacement. The rate and method of placing concrete and the arrangement of constructions joints shall be placed in accordance with the followings: In a continuous operation. Joints in reinforced slabs, joists and beams, shall be perpendicular to the axis or surface of the member jointed and at the center of the span. If an intersecting member occurs at that pointcolumn, the joint shall be located at formed about 75mm below the lowest soffit of the beams framing into it. Concrete in a point of minimum shear. Construction joints in columns beam shall be as shown on placed throughout without a joint, but if the drawings. Whenever it becomes necessary to stop workprovision of a joint is unavoidable, such stops the joint shall be located vertical and at center the middle of slabs the span. A joint in a suspended floor slab shall be vertical at the middle of the span at right angle to the principal reinforcement. The locations of construction joint shall be planned by the contractor well in advance of pouring and will have to be approved by the Engineer. Before fresh concrete is placed, the cement skin of beams the partially hardened concrete shall be thoroughly removed and surface made rough by hacking, sand blasting, water jetting, air jetting or any other method as directed by the Engineer. An adequate and acceptable key for succeeding work shall be formed by using stop boards which shall be constructed tightly to prevent any grout leak. As early as possible boards shall be removed and the surface thoroughly hacked and brushed to remove all laitance. Any leakage past stop boards shall be hacked off as soon as the concrete has set. The rough surface shall be left clean thoroughly wetted for about two hours and dry. Immediately prior to further concreting the joint face shall be soaked dried and coated with water and covered with 1:1 freshly mixed cement sand cement mortar of proportions identical to that in slurry before placing the concrete to be placed, punned into the body of the set new concrete. For exposed finishes, care The new concrete shall be exercised worked against the prepared surface before the slurry sets. Special care must always be taken to preserve an unbroken line at see that the exposed edge first layer of the jointconcrete placed after a construction joint is cold. In no circumstances Joints during pour shall the concrete be allowed to finish at a break running down a rough slope. Such cases, if found, will be treated as contrary to the specification and the Contractor will be required to cut out the member and re- cast. In the case of horizontal joints, any excess water and laitance shall be removed from the surface with 1:1 freshly made cement sand slurry only after the concrete is deposited and before it has set. Before casting slabs the haunching or seating for the slab shall be thoroughly hacked, sourced and washed and covered with at least 5 mm of mortar immediately before the slab is cast. Any necessary construction joints in foundations shall be stepped and lapped 600 mm. Joint faces shall be prepared and treated as described, above Specification Concrete Workremoving all loose materials.

Construction Joints. a. A construction joint is defined as a joint in the concrete introduced for convenience in construction at which special measures are taken to achieve subsequent continuity without provision for further relative movement. b. All contraction the drawings submitted for the Engineer's approval shall indicate position of all construction joints and lifts. No concreting shall be started until the Engineer has approved the method of placing, the positions and form of the construction joints and lifts. The construction joints shall be straight, truly vertical or level, so located as not to impair the cast may be, strength of the profile shown and formed in the exact positions shown on drawings structure. Rebates, keys or if not shown on the drawings, with prior approval of the Engineer. Vertical joints notches shall be formed against adequately secured rigid stop boards having splayed fillets, designed to pass and water stops inserted as the continuous steel reinforcement without temporary bending or displacementEngineer may require. The rate and method position of placing concrete construction joints and the arrangement size of constructions joints the formwork panels shall be placed so coordinated that where possible, the line of any construction joints coincides with the line of a formwork joint and that in any case all construction joint lines and formwork joint lines appear as a continuous operationregular and uniform series. Joints in reinforced slabsFor all exposed horizontal joints and purposely inclined joints, joists and beams, a uniform joint shall be perpendicular formed with a ▇▇▇▇▇▇ of approved dimensions to give a straight and neat joint line. c. Concrete placed to form the face of a construction joint shall have all laitance removed and the aggregate exposed prior to the axis or placing of fresh concrete. The laitance shall wherever practicable be removed by spraying the concrete surface with water under pressure and be removed while the concrete is still green. The whole of the member jointed and at the center concrete surface forming part of the span. If an intersecting member occurs at that point, the joint shall be located at a point of minimum shearhacked to expose the aggregate. Construction joints in columns Where aggregate is damaged during hacking, it shall be as shown on removed from the drawingsconcrete face by further hacking. Whenever it becomes necessary to stop work, such stops shall be located at center of slabs and of beams or as directed by the Engineer. An adequate and acceptable key for succeeding work shall be formed by using stop boards which shall be constructed tightly to prevent any grout leak. As early as possible boards All loose matter shall be removed and the exposed surface thoroughly hacked and brushed to remove all laitance. Any leakage past stop boards shall be hacked off as soon as cleaned by wire brushing, air blasting or washing, leaving the concrete has set. The surface shall be left thoroughly cleaned by wire brushing, air blasting or washing, leaving the surface clean and drydamp. Immediately prior to further concreting the joint face shall be soaked with water and covered with sand before fresh concrete is placed, a 12 mm. thick layer of sand/cement mortar of mixed in the same proportions identical to that as in the concrete to shall be placed, punned into spread in the body horizontal face of the set concreteconstruction joint. For exposed finishes, A drier mix shall be used for the top lift of horizontal pours to avoid laitance. The new concrete shall be well worked against the prepared face before the mortar sets. Special care shall be exercised taken to preserve an unbroken line at the exposed edge obtain thorough compaction and to avoid segregation of the joint. In no circumstances shall concrete along the concrete be allowed to finish at a break running down a rough slope. Such cases, if found, will be treated as contrary to the specification and the Contractor will be required to cut out the member and re- cast. In the case of horizontal joints, any excess water and laitance shall be removed from the surface after the concrete is deposited and before it has set. Before casting slabs the haunching or seating for the slab shall be thoroughly hacked, sourced and washed and covered with at least 5 mm of mortar immediately before the slab is cast. Any necessary construction joints in foundations shall be stepped and lapped 600 mm. Joint faces shall be prepared and treated as described, above Specification Concrete Workjoint plane.

Construction Joints. All contraction joints shall be straight, truly vertical or level, as the cast may be, of the profile shown and formed in the exact positions shown on drawings or if not shown on the drawings, with prior approval of the Engineer. Vertical joints shall be formed against adequately secured rigid stop boards having splayed fillets, designed to pass the continuous steel reinforcement without temporary bending or displacement. The rate and method of placing concrete and the arrangement of constructions joints shall be placed in a continuous operation. Joints in reinforced slabs, joists and beams, shall be perpendicular to the axis or surface of the member jointed and at the center of the span. If an intersecting member occurs at that point, the joint shall be located at a point of minimum shear. Construction joints in columns shall be as shown on the drawings. Whenever it becomes necessary to stop work, such stops shall be located at center of slabs and of beams or as directed by the Engineer. An adequate and acceptable key for succeeding work shall be formed by using stop boards which shall be constructed tightly to prevent any grout leak. As early as possible boards shall be removed and the surface thoroughly hacked and brushed to remove all laitance. Any leakage past stop boards shall be hacked off as soon as the concrete has set. The surface shall be left clean and dry. Immediately prior to further concreting the joint face shall be soaked with water and covered with sand cement mortar of proportions identical to that in the concrete to be placed, punned into the body of the set concrete. For exposed finishes, care shall be exercised to preserve an unbroken line at the exposed edge of the joint. In no circumstances shall the concrete be allowed to finish at a break running down a rough slope. Such cases, if found, will be treated as contrary to the specification and the Contractor will be required to cut out the member and re- cast. In the case of horizontal joints, any excess water and laitance shall be removed from the surface after the concrete is deposited and before it has set. Before casting slabs the haunching or seating for the slab shall be thoroughly hacked, sourced and washed and covered with at least 5 mm of mortar immediately before the slab is cast. Any necessary construction joints in foundations shall be stepped and lapped 600 mm. Joint faces shall be prepared and treated as described, above Specification Concrete Workabove