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11 CURING CONCRETE <br /> Concrete surfaces shall be adequately protected against early evaporation of water, <br /> injurious action by the sun, rain, flowing water, frost, freezing, and/or mechanical <br /> injury. <br /> 11.1 METHODS OF CURING <br /> One of the following optional methods shall be used unless otherwise <br /> specified: <br /> 11.1.1 MOIST CURING <br /> All exposed surfaces shall be maintained in a continuously moist <br /> condition for the period specified in this specification. Floor and <br /> roof slabs may be covered with a layer of sand or similar material <br /> and this covering shall be kept wet for the required period. Wood <br /> forms left in place shall be kept sufficiently wet at all times to <br /> prevent opening of the joints and drying of the concrete. <br /> 11.1.2 MEMBRANE CURING <br /> Pressure-spray tinted curing compounds shall be one of the types <br /> specified in ASTM C 309. All compounds shall be applied <br /> according to the manufacturer's directions immediately after <br /> finishing operations are completed. No curing compound shall be <br /> permitted on surfaces where future bonding with concrete or <br /> painting is specified. Such surfaces shall be cured by the moist <br /> process as specified in this specification. After final application <br /> of the curing compound, surfaces shall be protected from traffic <br /> for the period of time specified in this specification. The use of <br /> any membrane material which tends to impart a slippery surface <br /> to the concrete or alter its natural color shall not be permitted. <br /> The compound, however, shall contain a dye of color strength <br /> sufficient to render the film distinctly visible on the concrete <br /> surface for a period of at least four (4) hours after application. <br /> The compound shall be of such character that it will harden within <br /> SPEC. B - CONCRETE <br /> PAGE 17 <br />