Curing Practices for Concrete Pavements (2023) / Chapter Skim
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51 C H A P T E R 4 Introduction In this chapter two case examples (at three project sites) are presented.
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52 Curing Practices for Concrete Pavements the RCC, a series of instruments was installed to monitor vertical movement of the pavement. This section presents key background information on this study and a portion of the associated data collected with it.
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Case Examples of DOT Curing Practices 53 Tc = temperature of the concrete, °F Ta = temperature of ambient conditions, °F WV = wind velocity of ambient conditions, mph To quantify the e ects of weather on the vertical setting characteristics of the concrete through the thickness of the pavement, PE is useful to account for the e ects of ambient temperature, relative humidity, concrete temperature, and wind velocity on the development of a vertical set pro le. Figure 48 shows the PE traces for the project sites in Roseville, California (in September)
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54 Curing Practices for Concrete Pavements The collected data indicated that the concrete slab started to curl (induced by temperature differential) and warp (induced by moisture differential)
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Case Examples of DOT Curing Practices 55 e temperature data for both project sites were monitored and incorporated into the EI computations. In the placement at Roseville, the curing compound was sprayed at a 155 2/gal (3.8 m2/lit)
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56 Curing Practices for Concrete Pavements the sealed and surface positions progressively increased to 90%. The surface relative humidity started to reduce after a given period resulted in a lower EI of 0.69, as shown in Figure 52.
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Case Examples of DOT Curing Practices 57 -0.015 -0.010 -0.005 0.000 0.005 0.010 0.015 0.020 Time (hr)
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58 Curing Practices for Concrete Pavements 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 0% 10% 20% 30% 40% 50% 60% 70% 80% 90% 100% EI R el at iv e H um id ity Time Sealed RH RH Surf AmRH EI Figure 54.
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Case Examples of DOT Curing Practices 59 significance of curing quality and key factors associated with it. Although three of the four slabs placed were cast on the same day, the ambient and placement conditions varied enough to cause the slab movements at the corners to differ.
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60 Curing Practices for Concrete Pavements between the bottom and the top of the slab after 72 hours from the placement are also listed in the last column. This parameter was determined as follows: ( )
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