Abstract

Experimental studies have been undertaken to understand the link between hydric state and mechanical behaviour of rammed earth. Prismatic rammed earth sample of 15 cm × 15 cm × 45 cm, structured as a wall element with several layers, were subjected to one dimensional drying in laboratory. The kinetic of drying was monitored by continuous weighing the sample and humidity measurement at a regular interval. Suction was then used to represent the hydric state. Simultaneously, unconfined compressive strength was performed after 0, 2, 3, 4, 6, 8 and 19 weeks of drying. Digital image correlation was used to determine the stiffness of samples. Results show an increase up to 60% of the maximum in compressive strength in the first 3 weeks of drying which is correlated with a sharp decrease in water content in the sample. The suction was correlated with the evolution of mechanical performances of the samples during the drying.

摘要

已经进行了实验研究以了解夯土的含水状态与机械行为之间的联系。在实验室中对 15 cm × 15 cm × 45 cm 的棱柱状夯土样品进行一维干燥，其结构为具有多层的壁元件。通过连续称量样品和定期测量湿度来监测干燥动力学。然后使用吸力来表示含水状态。同时，在干燥 0、2、3、4、6、8 和 19 周后进行无侧限抗压强度测试。数字图像相关性用于确定样品的刚度。结果表明，在干燥的前 3 周内，抗压强度最高增加了 60%，这与样品中水含量的急剧下降有关。