Numerical study on the curling and warping of hardened rigid pavement slabs

What the ways to estimate the heat convection coefficient tell us? 43 4.2.2 Does wind speed still greatly influence both the thermal stress and temperature across the slabs in other regions?. Figure 2.2 Predicted versus in-situ observed temperature (dotted data reproduced from Yu et al. (1998). Note: air temperature is 19.8oC; daily peak value of the solar radiation is 630 W/m2; daily air temperature amplitude is 9.0oC; daily wind speed is 3m/s; the slab' thickness is 12inch therein.. Note: some days are rainy data such that the solar radiation is less than o C is used in order to magnify the computed of the model. <0 o C results in a complex number using Eq. vii Figure 4.4 The predicted thermal stress profile through a slab on a sunny day. The effect of heat history on the stress developed in a JPCP slab (a) top and (b) bottom of a JCPC slab.. Figure 8.6 slab-stress profiles at the cyclically-stable time suggest that the total stresses divert from the thermal stress; maximum tensile stress at the bottom appears 13:00PM, maximum compressive stress the top at night time (In Reno). Preface This dissertation computes the environmental loadings that in-service pavement slabs are subjects to. It develops a heat transfer model to predict the slab temperatures and then proposes a heat-transfer and moisture transport model to simulate the slab-moisture distribution. The environmental loadings are computed by uses of predicted temperatures and predicted moisture to evaluate the curling and warping of the slab. For the sake of simplicity, the computation considers only the stresses developed in joint plain concrete pavement slab and treats the slab as a beam that has visco-elastic, drying-creep behaviors. Other than the environmental loadings, the sensitivity of the local weather conditions to the slab-moisture and-temperature distributions are also of the dissertation's concern. The dissertation investigates the role of air temperature, wind speed, and solar radiation on the slab temperature; it assesses the influence of the wind speed, local annual rainfall distribution, and air relative humidity on the slab-moisture distribution. The dissertation contains 9 chapters. Chapter 1 presents the research significance regarding the models to predicted slab moisture and slab temperature and also reviews the literatures relative to this modeling. Chapter 2 develops a model to simulate the slab temperature distribution. Chapter 3 investigates the impact of air temperature on the temperature profile of in-service pavement slabs. This chapter has been …

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