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Xypex Chemical Corp. Integral Waterproofing of Concrete
Copyright 2009 ARCAT, Inc. - All rights reserved

          ** NOTE TO SPECIFIER ** Xypex Chemical Corp.; crystalline waterproofing admixture and treatment of construction joints between successive pours.
This section is based on the products of Xypex Chemical Corp., which is located at:
13731 Mayfield Pl.
Richmond, BC, Canada V6V 2G9
Toll Free Tel: 800-961-4477
Tel: 604-273-5265
Fax: 604-270-0451
Email: request info
[ Click Here ] for additional information.

Xypex waterproofing accomplishes waterproofing by forming crystals in the capillary pores of concrete. It is used in two ways in this section: 1) mixed into the concrete, and 2) applied to the surfaces of construction joints between successive pours to prevent leakage through the joint. Two other applications, surface application on new or existing concrete surfaces, and dry shake application on fresh horizontal concrete surfaces incorporated into the concrete surface during the finishing process, are included in Section 07162.

As an admixture, Xypex Admix consistently increases concrete strength, enables concrete slabs and walls to resist extreme hydrostatic pressure without surface coatings, and seals cracks up to 1/64 inch (0.4 mm) wide. It is approved for use by EPA, NSF International, and Agriculture Canada for potable water applications and is less costly for the same result than most other methods of waterproofing. .Xypex Admix canbe used above and below grade, and is especially useful for reservoirs, sewage and water treatment plants, secondary containment units, tunnels and subway systems, underground vaults, foundations, parking structures, swimming pools, and precast concrete components.

Xypex may be painted or otherwise coated, plastered, or tiled. However, because the waterproofing forms a relatively smooth surface and fills the concrete pores, the waterproofed surface may not have enough suction for bonding of cementitious materials like plaster and tile setting materials without the use of special bonding agents. It may be necessary to field test waterproofed surfaces to determine what preparation is necessary to ensure adhesion. .Concrete decks and slabs without control joints must be designed with sufficient reinforcement to minimize thermal movement and control cracking.
          PART 1GENERAL
          ** NOTE TO SPECIFIER ** Delete items below not required for project. Be sure to indicate which side the waterproofing is to be applied to, unless indicated on the Drawings.
          A.Crystalline waterproofing admixture for concrete.
          B.Crystalline waterproofing treatment of construction joints between successive concrete pours.
          C.The work of this section applies to concrete in the following locations:
          1.Water contact surfaces in treatment plant.
          2.Water storage tanks and reservoir.
          3.Tunnels, underground vaults, dry wells, and manholes.
          4.Parking structure.
          5.Swimming pool.
          ** NOTE TO SPECIFIER ** Delete any sections below not relevant to this project; add others as required.
          A.Section 03300 - Cast-in-Place Concrete: Concrete materials and placement.
          B.Section 07162 - Crystalline Waterproofing: Surface applied crystalline waterproofing.
          ** NOTE TO SPECIFIER ** Delete references from the list below that are not actually required by the text of the edited section.
          A.ACI 305R - Hot Weather Concreting.
          B.ACI 306R - Cold Weather Concreting.
          C.ACI 308 - Standard Practice for Curing Concrete.
          D.ASTM C 39/C 39M - Standard Test Method for Compressive Strength of Cylindrical Concrete Specimens.
          E.ASTM C 309 - Standard Specification for Liquid Membrane-Forming Compounds for Curing Concrete.
          F.ASTM C 666 - Standard Test Method for Resistance of Concrete to Rapid Freezing and Thawing.
          G.ASTM E 329 - Standard Specification for Agencies Engaged in the Testing and/or Inspection of Materials Used in Construction.
          H.COE CRD-C 48 - Standard Test Method for Water Permeability of Concrete.
          I.NSF 61 - Drinking Water System Components - Health Effects.
          A.Submit under provisions of Section 01300.
          B.Product Data: Manufacturer's data sheets on each product to be used, including:
          1.Preparation instructions and recommendations.
          2.Storage and handling requirements and recommendations.
          3.Installation methods.
          C.Manufacturer's Certificates: Certify products meet or exceed specified requirements.
          D.Closeout Submittals: Provide manufacturer's maintenance instructions that include recommendations for periodic checking and adjustment of cable tension and periodic cleaning and maintenance of all railing and infill components.
          A.Manufacturer Qualifications: A firm with not less than 10 years experience manufacturing crystalline waterproofing of the type specified, able to provide test reports showing compliance with specified performance characteristics, and able to provide on-site technical representation to advise on installation.
          B.Installer Qualifications: Experienced in work of the type specified in this section and acceptable to waterproofing manufacturer.
          C.Preinstallation Meeting: Before installation, conduct a meeting with the Contractor, waterproofing installer, installers of adjacent work and work penetrating waterproofing, and the waterproofing manufacturer's representative to verify project requirements, substrate conditions, manufacturer's installation instructions, and manufacturer' warranty requirements; notify the Owner and Architect/Engineer at least one week in advance of meeting.
          A.Deliver materials in manufacturer's original, unopened, undamaged containers with identification labels intact.
          B.Store materials protected from exposure to harmful weather conditions and at temperature conditions recommended by manufacturer.
          A.Maintain environmental conditions (temperature, humidity, and ventilation) within limits recommended by manufacturer for optimum results. Do not install products under environmental conditions outside manufacturer's absolute limits.
          A.Manufacturer's Warranty: Provide manufacturer's standard warranty document executed by authorized company official; warranty period: ____ years commencing on Date of Substantial Completion.
          1.9EXTRA MATERIALS
          A.See Section 01600 - Product Requirements, for additional provisions.
          PART 2PRODUCTS
          A.Acceptable Manufacturer: Xypex Chemical Corp., which is located at: 13731 Mayfield Pl.; Richmond, BC, Canada V6V 2G9; Toll Free Tel: 800-961-4477; Tel: 604-273-5265; Fax: 604-270-0451; Email: request info; Web:
          ** NOTE TO SPECIFIER ** Delete one of the following two paragraphs; coordinate with requirements of Division 1 section on product options and substitutions.
          B.Substitutions: Not permitted.
          C.Requests for substitutions will be considered in accordance with provisions of Section 01600.
          A.Waterproofing Admixture: Xypex Admix C-500, C-1000 or C-2000; proprietary compound of Portland cement, silica sand and active chemicals; provide product and mix ratio that produce concrete that complies with specified requirements in Section 03300 and the following:
          2.3SEM Analysis: Provide evidence of crystalline formation evidenced by scanning electron microscope photographs.
          2.4Permeability: No measurable leakage through waterproofed concrete, when tested in accordance with COE CRD-C 48 at 350 feet (106 m) of head or 150 psi (1034 kPa).
          2.5Chemical Resistance: Weight loss significantly less than control samples, when tested as follows:
          A.Test specimens consisting of concrete made with admixture dosage rates (to weight of cement) of 3 percent, 5 percent, and 7 percent, and a control sample prepared without admixture.
          B.Immerse samples in sulfuric acid and weigh daily.
          C.When weight loss of control sample reaches 50 percent, stop test and weigh treated samples.
          2.6Compressive Strength: At least 10 percent increase in strength compared to samples prepared without admixture, when tested in accordance with ASTM C 39/C 39M after 28 days.
          2.7Potable Water Contact Approval: NSF certification for use on structures holding potable water, based on testing in accordance with NSF 61.
          A.Slurry Coat: Slurry of Xypex Concentrate; proprietary compound of Portland cement, silica sand and active chemicals, mixed with water in proportions recommended by manufacturer to achieve the specified coverage with application method used.
          1.Coverage: 2.0 lb/sq yd (1.09 kg/sq m).
          A.Comply with requirements of Section 03300.
          ** NOTE TO SPECIFIER ** Some retardation of set may occur when using Xypex Admix. The amount of retardation will depend upon the concrete mix design, the dosage rate of the admixture, the temperature of the concrete, and climatic conditions. Concrete made with the admixture may develop higher ultimate strength than plain concrete.
          B.Make and test trial mixes under project conditions to determine setting time and strength of concrete; obtain manufacturer's recommendations regarding mix design, project conditions, and dosage rate.
          C.Add waterproofing admixture at time of batching and blend thoroughly, following manufacturer's instructions.
          D.In hot weather comply with ACI 305R; in cold weather comply with ACI 306R; use monomolecular film (evaporation retardant) on slabs during hot, dry, or windy conditions.
          E.Moist cure concrete in accordance with ACI 308; if moist curing is not possible, use curing compound complying with ASTM C 309.
          A.Comply with manufacturer's instructions, including technical bulletins, catalog installation instructions, and product packaging labels.
          B.Verify substrate conditions installed as specified in Section 03300 - Cast-in-Place Concrete, are acceptable for product installation in accordance with manufacturer' instructions; do not install unless substrate and ambient air temperature are within range acceptable to waterproofing manufacturer.
          C.Prepare surfaces to be treated in accordance with waterproofing manufacturer's instructions.
          D.Clean laitance, dirt film, paint, coatings or other foreign matter harmful to the performance of waterproofing from surfaces of cured concrete to be treated.
          E.Mix materials in accordance with manufacturer's instructions.
          F.Wet cold joint surface and saturate with clean water to enhance the crystalline formation process within concrete; remove excess surface water before application of slurry coat.
          G.Apply slurry coat uniformly with semi-stiff bristle brush or spray under conditions and application rate recommended by manufacturer.
          H.Place subsequent pour while slurry coat is still green, but after reaching initial set.
          A.Do not cover admixture treated concrete with other construction until it has been observed by manufacturer's field representative and Architect/Engineer.
          B.After removal of forms, patch and repair honeycombing, rock pockets, tie holes, faulty construction joints, cold joints, and cracks using waterproofing admixture manufacturer's recommended procedures.
          C.Manufacturer's Field Services: Provide manufacturer's field service consisting of product use recommendations and periodic site visits for inspection of concrete batching and product installation in accordance with manufacturer's instructions.
          ** NOTE TO SPECIFIER ** Carefully evaluate the following provisions. Some applications may not be possible to flood test. In cases where leaks cannot be observed directly, it may be necessary to measure the water level to determine whether leakage occurs. Delete the following if not required.
          D.Flood test areas that are capable of holding water after end of curing period.
          1.Plug or dam drains.
          2.Fill structures intended to hold liquids with water to within 1/2 inch (12.5 mm) from top of waterproofed vertical surfaces.
          3.Test slabs by constructing temporary dams where necessary, at least 2 inches (50 mm) high, and filling with 2 inches (50 mm) of water.
          4.Let water stand for 24 hours.
          5.Repair leaks and retest until no leaks are observed.
          A.Protect installed concrete from damage during construction.
          B.When backfilling occurs less than 7 days after installation, use moist backfill material.
          C.Do not apply paint or other coatings for at least 21 days; before applying coatings neutralize waterproofed surface as recommended by waterproofing manufacturer.