ABSTRACT

The purpose of this study is to compare the mechanical properties of continuous and discontinuous paving base mixtures. Two groups of different types of mixtures of upper and lower layers are designed. Two different forming methods are used for each type to simulate the construction process of double layer continuous and discontinuous paving. Then, unconfined compressive strength, splitting shear strength and flexural tensile strength were tested under two curing periods (7 and 30 days) and three test temperatures (room temperature, low temperature and freeze–thaw). According to the results, it is concluded that under the same curing time and test temperature, continuous paving can significantly improve the mechanical properties of the base, especially the shear and bending properties. The mechanical properties of the specimens with two kinds of mixtures at continuous paving are as follows: the increase percent of the unconfined compressive strength was 10.39%−38.65%, the increase percent of the shear strength was 88.89%−425%, and the increase percent of the flexural tensile strengths were 34.01%−50.57%. The increase of strength at low temperature and the decrease of strength under freezing-thawing condition are smaller than those of discontinuous samples. The research results can provide a technical basis for the design and construction of the base layer of discontinuous and continuous paving technology with different mixture composition. The purpose of this study is to compare the mechanical properties of continuous and discontinuous paving base mixtures. Two groups of different types of mixtures of upper and lower layers are designed. Two different forming methods are used for each type to simulate the construction process of double layer continuous and discontinuous paving. Then, the mechanical properties of the mixtures were evaluated. The results indicated that under the same curing time and test temperature, continuous paving can significantly improve the mechanical properties of the base, especially the shear and bending properties. For the continuous paving, the increase percent of the unconfined compressive strength was 10.39%–38.65%, the increase percent of the shear strength was 88.89%–425%, and the increase percent of the flexural tensile strengths were 34.01%–50.57%. The research results can provide a technical basis for the design and construction of the base layer of discontinuous and continuous paving technology with different mixture composition.

摘要

本研究的目的是比较连续和不连续铺路基层混合物的机械性能。设计了两组不同类型的上下层混合物。每种类型使用两种不同的成型方法来模拟双层连续和不连续摊铺的施工过程。然后，在两个固化周期（7 天和 30 天）和三个测试温度（室温、低温和冻融）下测试无侧限抗压强度、劈剪强度和弯曲拉伸强度。结果表明，在相同的养护时间和试验温度下，连续铺贴可以显着提高基层的力学性能，尤其是抗剪和抗弯性能。两种混合料连续摊铺试件的力学性能如下：无侧限抗压强度增加百分比为10.39%-38.65%，抗剪强度增加百分比为88.89%-425%，弯曲抗拉强度的百分比为34.01%-50.57%。低温下强度的增加和冻融条件下的强度下降均小于不连续样品。研究成果可为不同混合料组成的间断和连续铺装技术的基层设计和施工提供技术依据。本研究的目的是比较连续和不连续铺路基层混合物的机械性能。设计了两组不同类型的上下层混合物。每种类型使用两种不同的成型方法来模拟双层连续和不连续摊铺的施工过程。然后，评估混合物的机械性能。结果表明，在相同的养护时间和试验温度下，连续摊铺可以显着提高基层的力学性能，尤其是抗剪和抗弯性能。连续摊铺无侧限抗压强度增加幅度为10.39%～38.65%，抗剪强度增加幅度为88.89%～425%，抗弯抗拉强度增加幅度为34.01%～50.57%。