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首页> 外文期刊>The international journal of pavement engineering >Quantifying built-in construction gradients and early-age slab deformation caused by environmental loads in a jointed plain concrete pavement
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Quantifying built-in construction gradients and early-age slab deformation caused by environmental loads in a jointed plain concrete pavement

机译：定量分析接缝的普通混凝土路面中由环境载荷引起的内置施工梯度和早期平板变形

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摘要

Construction curling and warping produces a built-in gradient, which takes place as the result of changes in temperature and moisture that occur prior to the hardening of Portland cement concrete (PCC) pavements. The slab remains flat in the presence of this gradient because the plastic concrete has not developed sufficient stiffness to generate stress or strain. The new Guide for the Design of New and Rehabilitated Pavement Structures has shown the importance of quantifying the built-in gradient. In this study, the magnitude of the built-in gradient was quantified along with the early-age response of the slab to environmental loads. It was found that the equivalent linear temperature gradient at the time of set was < 0.09℃/cm (0.55℉/in.). The largest built-in curvature measured along the diagonal for the restrained and unrestrained slabs was 0.0000124 1/m (0.0000408 1/ft) and 0.0000138 1/m (0.0000454 1/ft), respectively. The increase in curvature with an increase in equivalent linear temperature gradient for the unrestrained slabs was 7% higher than the restrained slabs. The profiles also indicated that the slab edges are, at times, completely unsupported.
机译：施工卷曲和翘曲会产生内置的坡度，这是由于在波特兰水泥混凝土（PCC）路面硬化之前发生的温度和湿度变化而发生的。在存在此梯度的情况下，楼板保持平坦，因为塑料混凝土尚未形成足够的刚度以产生应力或应变。新的《新的和修复的路面结构设计指南》显示了量化内置坡度的重要性。在这项研究中，对内置梯度的大小以及板对环境载荷的早期响应进行了量化。结果发现，凝固时的等效线性温度梯度<0.09℃/ cm（0.55℉/ in。）。沿对角线测量的约束平板和非约束平板的最大内置曲率分别为0.0000124 1 / m（0.0000408 1 / ft）和0.0000138 1 / m（0.0000454 1 / ft）。对于无约束板，曲率的增加与等效线性温度梯度的增加相比，受约束的板高7％。轮廓还表明，板边缘有时完全不受支撑。

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