Home>ASTM Standards>ASTM C1471-05(R2021) pdf free download

ASTM C1471-05(R2021) pdf free download

ASTM C1471-05(R2021) pdf free download.Standard Guide for the Use of High Solids Content Cold Liquid-Applied Elastomeric Waterproofing Membrane on Vertical Surfaces
1. Scope
1.1 This guide describes the use of a high solids content, cold liquid-applied elastomeric waterproofing membrane that meets the performance criteria specified in Specification C836/ C836M, subject to intermittent hydrostatic pressure in a waterproofing system intended for installation on vertical cast-in-place concrete surfaces. 1.2 The committee with jurisdiction over this standard is not aware of any comparable standards published by other orga- nizations. 1.3 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in nonconformance with the standard. 1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appro- priate safety, health, and environmental practices and deter- mine the applicability ofregulatory limitations prior to use. 1.5 This international standard was developed in accor- dance with internationally recognized principles on standard- ization established in the Decision on Principles for the Development of International Standards, Guides and Recom- mendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
7. Substrate
7.1 General—The building wall substrate referred to in this guide is reinforced, cast-in-place concrete. 7.2 Strength—The strength of concrete is a factor to be considered with respect to liquid-applied membranes so far as it relates to surface finish, bond strength, and continuing integrity (absence of cracks and other concrete defects that could affect the integrity of the membrane). 7.3 Density and Moisture Content—The density and mois- ture content of concrete when cured are interrelated. Exces- sively high moisture content can affect adhesion of the mem- brane to a substrate, as moisture may condense at the membrane-to-concrete interface and cause membrane delami- nation. Lower moisture contents are achieved with the use of hard, dense stone aggregate. This type of coarse aggregate will generally provide structural concrete with moisture content from 3 to 5 % when cured. The concrete substrate should have a minimum density of 2100 kg/m 3 [130 lb/ft 3 ] and a maximum moisture content of 8 % when cured. 7.4 Admixtures—Polymeric, latex, or other organic chemi- cal based admixtures or modifiers can coat the concrete particles and reduce the adhesion of the membrane to the substrate. Ifthe concrete substrate will contain any admixtures, the membrane manufacturer should be consulted and should approve the use of the membrane with the specific proposed admixtures. 7.5 Release and Curing Agents—Form release agents and form oils are often used to facilitate the removal ofthe concrete form work, and curing agents are sometimes applied to the green (uncured) concrete surface. These chemicals can reduce the adhesion of the membrane to the concrete, and their use should be coordinated with and be accepted by the membrane manufacturer. Form oils should not be used on areas to receive waterproofing. If form oils were used, sandblasting or other approved methods must be used to remove the form oils prior to waterproofing application.7.6 Finish—The structural wall should have a smooth form finish. The surface should provide a mechanical bond for the membrane but not be so rough as to preclude achieving continuity of the membrane and the specified membrane thickness across its surface. All fins, projections, tie rod holes, and honeycomb must be repaired. The removal of fins and similar projections is especially critical, because they cause thin spots in the membrane that are easily punctured. The concrete surface at the top of the wall and at the footing should be of the same quality as the face of the wall. The footing should be troweled smooth and be free of fins, burrs, and large irregularities. A minimum width of 200 mm, with 300 mm preferred, should be available on the footing to effectively terminate the waterproofing membrane. The top of the footing should be sloped away from the wall. 7.7 Dryness—Membrane manufacturers’ requirements for substrate dryness vary and can include being visibly dry, passing a 4-h glass test, passing Test Method D4263 with no condensate, or having a specific maximum moisture content as measured by a moisture meter. Refer to and meet the manu- facturer’s requirements for the particular membrane being applied. It is recommended that the membrane not be applied sooner than 28 days after concrete placement.

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