Preparation of Surface. Immediately prior to placing aggregate base course, the previously constructed underlying surface course shall be cleaned of all foreign substances; if the surface of the underlying material has been damaged after placement or has inadequate compaction or other deviations from this contract specification requirements, such defects shall be repaired immediately prior to placement of this course.
Preparation of Surface. All putlog holes in brick work and junction between concrete and brick work shall be properly filled in advance. Joints in brick work shall be raked about 10mm and concrete surface hacked to provide grip to the plaster. Projecting burrs of mortar formed due to gaps at joints in shuttering shall be removed. The surface shall be scrubbed clean with wire brush/coil brush to remove dirt, dust etc. and the surface thoroughly washed with clean water to remove efflorescence, grease and oil etc. and shall be kept wet for a minimum of six hours before application of plaster.
Preparation of Surface. Immediately before applying the bituminous Material, the surface to be sealed shall be cleaned of all foreign and loose Material.
Preparation of Surface. The surface shall be thoroughly cleaned and dusted off. All rust, dirt, scales, smoke splashes, mortar droppings and grease shall be thoroughly removed before painting is started. The prepared surface shall have received the approval of the Engineer after inspection, before painting is commenced. Before pouring into smaller containers for use, the Paint shall be stirred thoroughly in its containers, when applying also, the Paint shall be continuously stirred in the smaller containers so that its consistency is kept uniform. The crossing and laying off consists of covering the area over with Paint, brushing the surface hard for the first time over and then brushing alternately in opposite direction, two or three times and then finally brushing lightly in a direction at right angles to the same. In this process, no brush marks shall be left after the laying off is finished. The full process of crossing and laying off will constitute one coat. Where so stipulated, the painting shall be done by spraying. Spray machine used may be (a) high pressure (small air aperture) type, or (b) a low pressure (large air gap) type, depending on the nature and location of work to be carried out. Skilled and experienced workmen shall be employed for this class of work. Paints used shall be brought to the requisite consistency by adding a suitable thinner. Spraying should be done only when dry condition prevails. Each coat shall be allowed to dry out thoroughly and rubbed smooth before the next coat is applied. This should be facilitated by thorough ventilation. Each coat except the last coat, shall be lightly rubbed down with sand paper or fine pumice stone and cleaned off dust before the next coat is laid. No left over Paint shall be put back into the stock tins. When not in use, the containers shall be kept properly closed. No hair marks from the brush or clogging of Paint puddles in the corners of panels, angles of moldings etc. shall be left on the work. In painting doors and windows, the putty round the glass panes must also be painted but care must be taken to see that no Paint stains etc. are left on the glass. Tops of shutters and surfaces in similar hidden locations shall not be left out in painting. However, bottom edge of the shutters where the painting is not practically possible, need not be done nor any deduction on this account will be done but two coats of primer of approved make shall be done on the bottom edge before fixing the shutters. On painting steel wor...
Preparation of Surface. All PPC patches which are placed during the same work shift the overlay is placed only require a minimum 15 minute cure time before application of the resin primer and placement of the PPC overlay and do not require additional surface preparation prior to application of the resin primer.
(1) Remove deteriorated or unsound concrete and repair the area with Polyester Polymer Concrete. Do not debond the reinforcing bars in partial depth preparations. Blast clean the reinforcement for all patching. For all patches use polyester polymer concrete. Strike off patches so they are level with the existing deck and have a rough finish.
(2) As the final preparation for the placement of the overlay, make a complete cleanup by shot blasting and/or other approved means, followed by an air blast with dry, oil free air. Brooming is not acceptable. Remove all loose disintegrated concrete, dirt, grease, rust, paint, oil, asphalt, laitance carbonation and curing materials from patches and other foreign material from the surface of the deck.
(3) Produce a surface relief equal to the International Concrete Repair Institute (ICRI) Surface Preparation Level 6 to 7 or ASTM E 965 Pavement Macrotexture Depth of 0.04 to 0.08 inch. The following test will determine if additional surface preparation is necessary.
(a) Place a PPC test patch a minimum of 0.5 square yards for each lane or planned completed day’s work, whichever is smaller. Submit a sequence plan to the Engineer. The test patch depth shall be as specified for the overlay depth, placed by the normal construction sequence.
(b) Final acceptance will be based on the following results of the test outlined in Attachment 1: • Minimum Tensile Rupture Strength of 250 psi from an average of 3 tests on a test patch regardless of depth of failure (See Attachment 1); or • Failure in the concrete at a depth greater than or equal to ¼ inch over more than 50% of the test area for three of the four tests in the test patch.
(c) If failure in the concrete is at a depth less than ¼ inch and the Minimum Tensile Rupture Strength is less than 250 psi, or the failure in the concrete is less than 50% of the test area, additional surface preparation is necessary.
(d) A failure in the concrete below 250 psi and greater than ¼ inch deep indicates weak concrete, not poor overlay bond.
(e) Do not perform tensile adhesion tests when bridge deck temperatures are above 100°F.
(4) Remove any contamination of the prepared deck surface or surface of subseque...
Preparation of Surface. Before plastering, masonry joints are to be raked out. Mortar powder and dust shall be brushed out from joints, and the surface shall be washed with clean water and shall be watered well. Cement slurry shall be applied to R.
Preparation of Surface. Immediately prior to applying the slurry, the Contractor shall clean the trail surface of all loose material, silt spots, vegetation, and any other matter, which may adversely affect the adherence of the slurry to the existing pavement. The Contractor shall be responsible for sweeping all parking lot sections to be slurried with a mechanical power broom prior to sealing. The Project Manager may require particularly dirty parking lot sections to be flushed with water. The Project Manager must approve all flushing operations. The Contractor shall be responsible for cleaning sidewalks soiled by flushing operations. The Contractor shall be responsible for removing all traffic striping, markings and raised pavement markers prior to the slurry seal operation. Also see Section “Parking Lot Stripe, Pavement Markings and Curb Painting” found elsewhere in this “Exhibit A, Scope and Services” for the removal of existing traffic striping. All materials removed become the property of the Contractor and shall be disposed of in accordance with the provision of 7-1.13, “Disposal of Material Outside the Highway Right of Way“, in the State Standard Specifications. The Contractor shall be responsible for locating, covering, removing, cleaning and protecting all utility covers, maintenance hole covers, water valve boxes, and any other utility covers. All manholes, utility, and survey monument covers encountered in the area to be resurfaced shall be carefully referenced out prior to the resurfacing operations by the Contractor. The methods of protection, referencing, locating, and cleaning shall be subject to approval by the Project Manager prior to any resurfacing. All protective coverings shall be removed before opening the parking lot to traffic. The slurry seal shall be placed at a rate of approximately twelve (12) to fifteen (15) pounds per square yard. The exact rate shall be as determined by specific weight of aggregate, the surface demand of the pavement, and size of the largest particle size of the aggregate. The slurry seal shall not be placed when the existing pavement or air temperature is below 55 degrees Fahrenheit (55°F) and falling, or during unsuitable weather, but may be applied when both pavement and air temperature are above 45 degrees Fahrenheit (45°F) and rising. When slurry starts or finishes, a straight-line cut-off shall be obtained by laying down a strip of building paper or other approved material. The Contractor shall remove such paper and any exces...
Preparation of Surface. The exterior wall is completely free from all dust, loose paint and fungus. Clean the wall thoroughly using wire brush and water and sand paper if necessary. Pay special attention to the tops of parapets and other horizontal surfaces where fungus is most likely to grow.
Preparation of Surface. The joints in the masonry shall be raked out to a depth not less than the width of the joint or as directed when the mortar is green. Joints shall be brushed clean of dust and loose particles with a stiff brush. The area shall then be washed and the joint thoroughly wetted before pointing is commenced.
Preparation of Surface. The joints of the brickwork shall be racked out to a depth of at least 15 mm. In case of R.C.C walls, the surface shall be hacked and roughened with wire brushes. The surface shall be cleaned thoroughly washed with water and kept wet.
