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首页> 美国卫生研究院文献>Heliyon >Quantifying the impact of coefficient of thermal expansion of overlay concrete on unbonded concrete overlay performance
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Quantifying the impact of coefficient of thermal expansion of overlay concrete on unbonded concrete overlay performance

机译：量化覆盖混凝土的热膨胀系数对无粘结混凝土覆盖性能的影响

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摘要

With the advancement in pavement design and performance analysis procedures, the coefficient of thermal expansion (CTE) of concrete has emerged as a significant design input with a direct impact on concrete pavement performance parameters including transverse cracking, joint faulting, and pavement roughness. CTE is the measure of change in concrete volume with temperature change and the resulting curling of concrete pavement slab is directly proportional to CTE. Un-Bonded Concrete Overlay (UBCO) is a cost-effective and sustainable rehabilitation technique on Jointed Plain Concrete Pavements (JPCP) to improve the performance of deteriorated concrete pavements. This study examines the effects of variability of CTE on the performance of unbonded JPCP overlays for two different climatic regions. Simulations were conducted using AASHTO pavement ME design software with varying CTE values in the range of 6.8–10.8 micro-strain/°C and keeping all other design variables as constant. The performance predictions were evaluated for different values of CTE and the results indicated that with an increase in CTE value, the performance of UBCO is adversely affected by the increase in pavement distresses. Amongst all the performance parameters, transverse cracking is the most significantly affected parameter with the change in CTE. The impact of geometric properties of overlay pavement including transverse joint spacing and slab thickness on the pavement performance was also analyzed which indicated that these have a direct impact on the performance parameters. The overlay performance can be improved by increased overlay slab thickness or reduced joint spacing and with these modifications, the adverse effects of higher CTE can be compensated. Field performance data of UBCO extracted from the LTPP database showed that the pavement ME design software can accurately predict the performance of UBCO pavement systems.
机译：随着路面设计和性能分析程序的发展，混凝土的热膨胀系数（CTE）成为重要的设计输入，直接影响混凝土路面性能参数，包括横向裂缝，接缝断层和路面粗糙度。 CTE是随温度变化而变化的混凝土体积的量度，混凝土路面板的最终卷曲与CTE成正比。无粘结混凝土覆盖层（UBCO）是一种在节理的纯混凝土路面（JPCP）上具有成本效益且可持续的修复技术，目的是提高劣化混凝土路面的性能。这项研究检查了CTE变异性对两个不同气候区域的未结合JPCP覆盖层性能的影响。使用AASHTO路面ME设计软件进行了仿真，其CTE值在6.8-10.8微应变/°C范围内变化，而所有其他设计变量保持不变。对不同CTE值的性能预测进行了评估，结果表明，随着CTE值的增加，UBCO的性能会受到路面应力的增加的不利影响。在所有性能参数中，横向裂缝是受CTE变化影响最大的参数。分析了包括横向缝间距和平板厚度在内的铺面路面几何特性对路面性能的影响，表明这些因素对性能参数有直接影响。可以通过增加覆盖板厚度或减小接缝间距来改善覆盖性能，并且通过这些修改，可以补偿较高CTE的不利影响。从LTPP数据库中提取的UBCO的现场性能数据表明，路面ME设计软件可以准确预测UBCO路面系统的性能。

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