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STRUCTURAL
<br />SPECIFICATIONS
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<br />CAST-IN-PLACE CONCRETE 03 30 00 - 17
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<br />3.7 PATCHING FORMED CONCRETE:
<br />A. Remove fins, projections, and offsets. Cut out rock pockets, honeycomb, and all other
<br />defects to sound concrete, with edges of cuts straight and back-beveled. Dampen cut-
<br />outs and edges, and scrub with neat portland cement slurry just before patching, or an
<br />apply approved epoxy concrete adhesive.
<br />B. Saturate form tie holes with water and fill voids and patches with flush smooth-finished
<br />mortar of same mix as concrete (less coarse aggregate), cure, and dry.
<br />3.8 MISCELLANEOUS CONCRETE ITEMS:
<br />A. Filling In: Fill in holes and openings left in concrete structures for passage of Work
<br />specified in other Sections, after such Work is in place. Mix, place, and cure concrete as
<br />specified to blend with in-place construction. Provide other miscellaneous concrete
<br />filling shown or required to complete Work.
<br />B. Curbs: Provide monolithic finish to interior curbs by stripping forms while concrete is
<br />still green and by steel-troweling surfaces to a hard, dense finish with corners,
<br />intersections, and terminations slightly rounded.
<br />C. Equipment Bases and Foundations: Provide machine and equipment bases and
<br />foundations as shown on drawings. Set anchor bolts for machines and equipment to
<br />template at correct elevations, complying with diagrams or templates of manufacturer
<br />furnishing machines and equipment.
<br />3.9 GROUTING AND DRYPACKING:
<br />A. Install as indicated or required. Where grouting and drypacking is part of the work of
<br />other sections, it shall conform to the following requirements, as applicable.
<br />B. Drypacking: Mix materials thoroughly with minimum amount of water. Pre -saturate
<br />surfaces to receive dry pack for 24-hours prior to placement, install drypack by forcing
<br />and rodding to fill voids and provide complete bearing under plates. Finish exposed
<br />surfaces smooth and cure with damp burlap or liquid curing compound.
<br />C. Non-Shrink Grouting:
<br />1. Mixing: Mix the approved non-shrink grout material with sufficient water per
<br />manufacturer’s recommendations.
<br />2. Application: Surfaces to receive the non-shrink grout shall be clean, and shall
<br />be pre-saturated thoroughly 24-hours before placing the mortar. Before
<br />grouting, surfaces to be in contact shall be roughened and cleaned thoroughly,
<br />all loose particles shall be removed and the surface flushed thoroughly with
<br />neat cement grout immediately before the grouting mortar is placed. Place fluid
<br />grout from one side only and puddle, chain, or pump for complete filling of
<br />voids; do not remove the dams or forms until grout attains initial set. Finish
<br />exposed surfaces smooth, and cure as recommended by grout manufacturer.
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<br />3.10 SITE CONCRETE WORK:
<br />A. Use bituminous type joint filler. Cure all concrete for at least 10 days with liquid curing
<br />compound or sheet material except as otherwise specified. Construct all site concrete
<br />of 2,000 psi concrete unless otherwise indicated or specified. Provide reinforcing bars
<br />or mesh only where indicated. Conform to requirements specified hereinbefore for slab
<br />finishing and curing as applicable.
<br />B. Concrete Curbs: Provide 1/2" thick expansion joints, at beginning and at end of curves,
<br />intersections, and 20-foot intervals between, set plumb, square, and to same profile as
<br />the curbs. Edge curb tops to 1/2" radius and vertical joints to 1/4" radius. Apply smooth
<br />finish followed by fine hair brush finish.
<br />C. Concrete Gutters: Provide 1/2" thick expansion joints as above for curbs and apply a
<br />light broom finish with a 3" wide steel trowel finish at flow line.
<br />D. Combination Curb and Gutter: As above for curbs and gutters, including expansion
<br />joints, 3" troweled flow line at base of curb.
<br />E. Concrete Walks: Provide 1/2" expansion joints as specified for curbs and where walks
<br />abut rigid structures, aligned with joints in curbs where adjoining, and apply light broom
<br />finish perpendicular to traffic direction. Score walks as shown or directed.
<br />F. Control Joints: Provide sawed joints for concrete walks and exterior concrete pavement
<br />as indicated. Use "Zip Strip" as distributed by S.C.A. Construction Supply, Santa Fe
<br />Springs, Calif., or equal only where specifically indicated. Install tops of the joints flush
<br />with the concrete surface and depth of joint a minimum of 1/4 the thickness of slab.
<br />3.11 SLURRY CONCRETE:
<br />A. Slurry concrete shall be used as fill or backfill where indicated, and wherever
<br />excavations are carried below design depths without approval. Slurry concrete shall be
<br />placed within 1 hour after mixing, and shall be placed in manner that will prevent voids
<br />in, or segregation of, the concrete.
<br />B. Backfilling over slurry concrete shall not be done less than 4 hours after placing.
<br />3.12 FIELD QUALITY CONTROL:
<br />A. Level of Floors: Continuously monitor concrete placing to maintain level floor by use of
<br />an instrument level, transit, or laser
<br />B. Delivery tickets: Have available copies of delivery tickets complying with ASTM C94 for
<br />each load of concrete delivered to site. Include on the tickets the additional information
<br />specified in the ASTM document.
<br />C. Continuous Inspection: Construct structural concrete exceeding 2,500 psi compressive
<br />strength under continuous inspection of Inspector. Obtain inspection and approval of
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<br />forms and reinforcing by Building Department as required and by the Inspector before
<br />placing structural concrete.
<br />D. Testing of Concrete: Testing Laboratory shall perform the following tests. Samples for
<br />testing shall be obtained in accordance with ASTM C172 and shall be taken from as close
<br />to point of placement as possible.
<br />1. Compressive Strength Tests: Cast one set of four or more cylinders from each
<br />day's placing and each 150 cubic yards, or fraction thereof, or not less than once
<br />for each 5,000 square feet of surface area for slabs and walls, of each strength
<br />of structural concrete. Date cylinders, assign record number, and tag showing
<br />the location from which sample was taken. Also record slump test result of
<br />sample. Do not make more than two series of tests from any one location or
<br />batch of concrete.
<br />2. Slump Tests: Make slump test for each set of test cylinders.
<br />3. Test Cylinders: Samples will be made in accordance with ASTM C172. Cast
<br />cylinders according to ASTM C31; 24 hours later, store cylinders under moist
<br />curing conditions at about 70 degrees F. Test according to ASTM C39; one at 7
<br />and two at 28 day ages. The remaining cylinder(s) shall be kept in reserve in
<br />case tests are unsatisfactory.
<br />4. Control Test Cylinders: Cast a set of two or more cylinders for each day's placing
<br />of concrete for slabs supported on shoring. Place test cylinders on slabs
<br />represented by cylinders and cure the same as slabs. Test cylinders to
<br />determine proper times for removal of shores and reshoring. A strength test
<br />shall be the average of the compressive strengths of 2 cylinders made from the
<br />same sample of concrete and tested at 28 days.
<br />5. Shrinkage Test: Cast 4" by 4" by 11" long bars with 10" effective gauge length,
<br />cured for 7 days in moist room and as specified in ASTM C157. Make
<br />measurements at 7-day intervals to 35 day age. Allowable shrinkage shall not
<br />exceed 0.045% after period of 35 days.
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<br />E. Tests for Lightweight Structural Concrete: Conform to CBC Section 1705.3 and ACI 318
<br />Section 26.12.2. Perform following test for each 150 cubic yards of lightweight
<br />structural concrete.
<br />1. Along with slump test, ASTM C143, and from same sample, determine air
<br />content, unit weight and yield per ASTM C138.
<br />2. Shrinkage Test: Cast 4" by 4" by 11" long bars with 10" effective gauge length,
<br />cured for 7 days in moist room and as specified in ASTM C157. Make
<br />measurements at 7-day intervals to 35-day age. Allowable shrinkage shall not
<br />exceed 0.05% after period of 35 days.
<br />3. Previous Shrinkage Tests: Ready-mix concrete manufacturer may furnish
<br />certified test reports from an approved Testing Laboratory as proof of meeting
<br />shrinkage requirements provided aggregates used and concrete covered by
<br />such test reports conform to the mix design approved for use on the Work.
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<br />F. Core Tests: comply with ACI 318. If tests show the compressive strength of any concrete
<br />falls below the required minimum, additional testing of concrete which unsatisfactory
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<br />CAST-IN-PLACE CONCRETE 03 30 00 - 20
<br />tests represent may be required. Make core tests according to ASTM C42. Fill core holes
<br />with drypack concrete of strength required for concrete. Contractor shall bear cost of
<br />tests for below-strength concrete even if such tests indicate concrete has attained
<br />required minimum compressive strength, and all costs for required corrections.
<br />G. Field Certifications: For all concrete, provide signed copy of batch plant's certificate
<br />stating quantity of each material, amount of water, admixtures, departure time and
<br />date accompanying each load of materials or concrete.
<br />3.15 DEFECTIVE CONCRETE
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<br />A. Defective Concrete: The following concrete will be deemed to be defective, and shall
<br />be removed promptly from the job site.
<br />1. Concrete, which is not formed as indicated, is not true to intended alignment,
<br />is not plumb or level where so intended, is not true to intended grades and
<br />levels;
<br />2. Has voids or honeycomb that have been cut, resurfaced, or filled, unless with
<br />the approval of the Architect;
<br />3. Has sawdust, shavings, wood, or embedded debris;
<br />4. Does not conform fully to provisions of the Contract Documents.
<br />B. Repairs and Replacements:
<br />1. Where defective concrete is found after removal of the forms, cut out the
<br />defective concrete, if necessary, and make the surfaces match adjacent
<br />surfaces.
<br />2. Work uneven surfaces and angles of concrete to a surface matching adjacent
<br />concrete surfaces.
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<br />3.16 PROTECTION:
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<br />1. Protection: Protect concrete from marring and damage due to weather and
<br />construction activities.
<br />1. Protective measures shall include providing temporary coverings, as specified
<br />in Section 01 50 00 - Construction Facilities and Temporary Controls, and
<br />prohibiting all non-essential construction activities, including cleaning and
<br />maintenance of construction equipment.
<br />2. In particular, protect concrete floor slabs from oil, paint and other products
<br />which might penetrate and degrade concrete surface
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<br />END OF SECTION
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